// ═══════════════════════════════════════════════════════════════════════════
// Story Summary - Prompt Injection (v2 - DSL 版)
// - 仅负责"构建注入文本"，不负责写入 extension_prompts
// - 注入发生在 story-summary.js：GENERATION_STARTED 时写入 extension_prompts
// ═══════════════════════════════════════════════════════════════════════════

import { getContext } from "../../../../../../extensions.js";
import { xbLog } from "../../../core/debug-core.js";
import { getSummaryStore, getFacts, isRelationFact } from "../data/store.js";
import { getVectorConfig, getSummaryPanelConfig, getSettings } from "../data/config.js";
import { recallMemory, buildQueryText } from "../vector/retrieval/recall.js";
import { getChunksByFloors, getAllChunkVectors, getAllEventVectors, getMeta } from "../vector/storage/chunk-store.js";

// METRICS
import { formatMetricsLog, detectIssues } from "../vector/retrieval/metrics.js";

const MODULE_ID = "summaryPrompt";

// ─────────────────────────────────────────────────────────────────────────────
// 召回失败提示节流
// ─────────────────────────────────────────────────────────────────────────────

let lastRecallFailAt = 0;
const RECALL_FAIL_COOLDOWN_MS = 10_000;

/**
 * 检查是否可以通知召回失败
 * @returns {boolean}
 */
function canNotifyRecallFail() {
    const now = Date.now();
    if (now - lastRecallFailAt < RECALL_FAIL_COOLDOWN_MS) return false;
    lastRecallFailAt = now;
    return true;
}

// ─────────────────────────────────────────────────────────────────────────────
// 预算常量
// ─────────────────────────────────────────────────────────────────────────────

const MAIN_BUDGET_MAX = 10000;
const ORPHAN_MAX = 2500;
const RECENT_ORPHAN_MAX = 5000;
const TOTAL_BUDGET_MAX = 15000;
const L1_MAX = 2000;
const ARCS_MAX = 1500;
const TOP_N_STAR = 5;

// ─────────────────────────────────────────────────────────────────────────────
// 工具函数
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 估算 token 数量
 * @param {string} text - 文本
 * @returns {number} token 数
 */
function estimateTokens(text) {
    if (!text) return 0;
    const s = String(text);
    const zh = (s.match(/[\u4e00-\u9fff]/g) || []).length;
    return Math.ceil(zh + (s.length - zh) / 4);
}

/**
 * 带预算控制的行推入
 * @param {Array} lines - 行数组
 * @param {string} text - 文本
 * @param {object} state - 预算状态 {used, max}
 * @returns {boolean} 是否成功
 */
function pushWithBudget(lines, text, state) {
    const t = estimateTokens(text);
    if (state.used + t > state.max) return false;
    lines.push(text);
    state.used += t;
    return true;
}

/**
 * 计算余弦相似度
 * @param {Array} a - 向量 a
 * @param {Array} b - 向量 b
 * @returns {number} 相似度
 */
function cosineSimilarity(a, b) {
    if (!a?.length || !b?.length || a.length !== b.length) return 0;
    let dot = 0, nA = 0, nB = 0;
    for (let i = 0; i < a.length; i++) {
        dot += a[i] * b[i];
        nA += a[i] * a[i];
        nB += b[i] * b[i];
    }
    return nA && nB ? dot / (Math.sqrt(nA) * Math.sqrt(nB)) : 0;
}

/**
 * 解析楼层范围
 * @param {string} summary - 摘要文本
 * @returns {object|null} {start, end}
 */
function parseFloorRange(summary) {
    if (!summary) return null;
    const match = String(summary).match(/\(#(\d+)(?:-(\d+))?\)/);
    if (!match) return null;
    const start = Math.max(0, parseInt(match[1], 10) - 1);
    const end = Math.max(0, (match[2] ? parseInt(match[2], 10) : parseInt(match[1], 10)) - 1);
    return { start, end };
}

/**
 * 清理摘要中的楼层标记
 * @param {string} summary - 摘要文本
 * @returns {string} 清理后的文本
 */
function cleanSummary(summary) {
    return String(summary || "")
        .replace(/\s*\(#\d+(?:-\d+)?\)\s*$/, "")
        .trim();
}

/**
 * 规范化字符串（用于比较）
 * @param {string} s - 字符串
 * @returns {string} 规范化后的字符串
 */
function normalize(s) {
    return String(s || '')
        .normalize('NFKC')
        .replace(/[\u200B-\u200D\uFEFF]/g, '')
        .trim()
        .toLowerCase();
}

// ─────────────────────────────────────────────────────────────────────────────
// 上下文配对工具函数
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 获取上下文楼层
 * @param {object} chunk - chunk 对象
 * @returns {number} 配对楼层，-1 表示无效
 */
function getContextFloor(chunk) {
    if (chunk.isL0) return -1;
    return chunk.isUser ? chunk.floor + 1 : chunk.floor - 1;
}

/**
 * 选择配对 chunk
 * @param {Array} candidates - 候选 chunks
 * @param {object} mainChunk - 主 chunk
 * @returns {object|null} 配对 chunk
 */
function pickContextChunk(candidates, mainChunk) {
    if (!candidates?.length) return null;
    const targetIsUser = !mainChunk.isUser;
    const opposite = candidates.find(c => c.isUser === targetIsUser);
    if (opposite) return opposite;
    return candidates[0];
}

/**
 * 格式化上下文 chunk 行
 * @param {object} chunk - chunk 对象
 * @param {boolean} isAbove - 是否在主 chunk 上方
 * @returns {string} 格式化的行
 */
function formatContextChunkLine(chunk, isAbove) {
    const { name1, name2 } = getContext();
    const speaker = chunk.isUser ? (name1 || "用户") : (chunk.speaker || name2 || "角色");
    const text = String(chunk.text || "").trim();
    const symbol = isAbove ? "┌" : "└";
    return `  ${symbol} #${chunk.floor + 1} [${speaker}] ${text}`;
}

// ─────────────────────────────────────────────────────────────────────────────
// 系统前导与后缀
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 构建系统前导
 * @returns {string}
 */
function buildSystemPreamble() {
    return [
        "以上是还留在眼前的对话",
        "以下是脑海里的记忆：",
        "• [定了的事] 这些是不会变的",
        "• 其余部分是过往经历的回忆碎片",
        "",
        "请内化这些记忆：",
    ].join("\n");
}

/**
 * 构建后缀
 * @returns {string}
 */
function buildPostscript() {
    return [
        "",
        "这些记忆是真实的，请自然地记住它们。",
    ].join("\n");
}

// ─────────────────────────────────────────────────────────────────────────────
// L1 Facts 分层过滤
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 从 store 获取所有已知角色名
 * @param {object} store - summary store
 * @returns {Set<string>} 角色名集合（规范化后）
 */
function getKnownCharacters(store) {
    const names = new Set();

    // 从 arcs 获取
    const arcs = store?.json?.arcs || [];
    for (const a of arcs) {
        if (a.name) names.add(normalize(a.name));
    }

    // 从 characters.main 获取
    const main = store?.json?.characters?.main || [];
    for (const m of main) {
        const name = typeof m === 'string' ? m : m.name;
        if (name) names.add(normalize(name));
    }

    // 从当前角色获取
    const { name1, name2 } = getContext();
    if (name1) names.add(normalize(name1));
    if (name2) names.add(normalize(name2));

    return names;
}

/**
 * 解析关系类 fact 的目标人物
 * @param {string} predicate - 谓词，如 "对蓝袖的看法"
 * @returns {string|null} 目标人物名
 */
function parseRelationTarget(predicate) {
    const match = String(predicate || '').match(/^对(.+)的/);
    return match ? match[1] : null;
}

/**
 * 过滤 facts（分层策略）
 *
 * 规则：
 * - isState=true：全量保留
 * - 关系类（谓词匹配 /^对.+的/）：from 或 to 在 focus 中
 * - 人物状态类（主体是已知角色名）：主体在 focus 中
 * - 其他（物品/地点/规则）：全量保留
 *
 * @param {Array} facts - 所有 facts
 * @param {Array} focusEntities - 焦点实体
 * @param {Set} knownCharacters - 已知角色名集合
 * @returns {Array} 过滤后的 facts
 */
function filterFactsByRelevance(facts, focusEntities, knownCharacters) {
    if (!facts?.length) return [];

    const focusSet = new Set((focusEntities || []).map(normalize));

    return facts.filter(f => {
        // 1. isState=true：全量保留
        if (f._isState === true) return true;

        // 2. 关系类：from 或 to 在 focus 中
        if (isRelationFact(f)) {
            const from = normalize(f.s);
            const target = parseRelationTarget(f.p);
            const to = target ? normalize(target) : '';

            // 任一方在 focus 中即保留
            if (focusSet.has(from) || focusSet.has(to)) return true;

            // 都不在 focus 中则过滤
            return false;
        }

        // 3. 主体是已知角色名：检查是否在 focus 中
        const subjectNorm = normalize(f.s);
        if (knownCharacters.has(subjectNorm)) {
            return focusSet.has(subjectNorm);
        }

        // 4. 主体不是人名（物品/地点/规则等）：保留
        return true;
    });
}

/**
 * 格式化 facts 用于注入
 * @param {Array} facts - facts 数组
 * @param {Array} focusEntities - 焦点实体
 * @param {Set} knownCharacters - 已知角色名集合
 * @returns {Array} 格式化后的行
 */
function formatFactsForInjection(facts, focusEntities, knownCharacters) {
    // 先过滤
    const filtered = filterFactsByRelevance(facts, focusEntities, knownCharacters);

    if (!filtered.length) return [];

    // 按 since 降序排序（最新的优先）
    return filtered
        .sort((a, b) => (b.since || 0) - (a.since || 0))
        .map(f => {
            const since = f.since ? ` (#${f.since + 1})` : '';
            if (isRelationFact(f) && f.trend) {
                return `- ${f.s} ${f.p}: ${f.o} [${f.trend}]${since}`;
            }
            return `- ${f.s}的${f.p}: ${f.o}${since}`;
        });
}

// ─────────────────────────────────────────────────────────────────────────────
// 格式化函数
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 格式化角色弧光行
 * @param {object} a - 弧光对象
 * @returns {string}
 */
function formatArcLine(a) {
    const moments = (a.moments || [])
        .map(m => (typeof m === "string" ? m : m.text))
        .filter(Boolean);

    if (moments.length) {
        return `- ${a.name}：${moments.join(" → ")}`;
    }
    return `- ${a.name}：${a.trajectory}`;
}

/**
 * 格式化 chunk 完整行
 * @param {object} c - chunk 对象
 * @returns {string}
 */
function formatChunkFullLine(c) {
    const { name1, name2 } = getContext();

    if (c.isL0) {
        return `› #${c.floor + 1} [📌] ${String(c.text || "").trim()}`;
    }

    const speaker = c.isUser ? (name1 || "用户") : (c.speaker || name2 || "角色");
    return `› #${c.floor + 1} [${speaker}] ${String(c.text || "").trim()}`;
}

/**
 * 格式化带上下文的 chunk
 * @param {object} mainChunk - 主 chunk
 * @param {object|null} contextChunk - 上下文 chunk
 * @returns {Array} 格式化的行数组
 */
function formatChunkWithContext(mainChunk, contextChunk) {
    const lines = [];
    const mainLine = formatChunkFullLine(mainChunk);

    if (!contextChunk) {
        lines.push(mainLine);
        return lines;
    }

    if (contextChunk.floor < mainChunk.floor) {
        lines.push(formatContextChunkLine(contextChunk, true));
        lines.push(mainLine);
    } else {
        lines.push(mainLine);
        lines.push(formatContextChunkLine(contextChunk, false));
    }

    return lines;
}

/**
 * 格式化因果事件行
 * @param {object} causalItem - 因果项
 * @param {Map} causalById - 因果映射
 * @returns {string}
 */
function formatCausalEventLine(causalItem, causalById) {
    const ev = causalItem?.event || {};
    const depth = Math.max(1, Math.min(9, causalItem?._causalDepth || 1));
    const indent = "  │" + "  ".repeat(depth - 1);
    const prefix = `${indent}├─ 前因`;

    const time = ev.timeLabel ? `【${ev.timeLabel}】` : "";
    const people = (ev.participants || []).join(" / ");
    const summary = cleanSummary(ev.summary);

    const r = parseFloorRange(ev.summary);
    const floorHint = r ? `(#${r.start + 1}${r.end !== r.start ? `-${r.end + 1}` : ""})` : "";

    const lines = [];
    lines.push(`${prefix}${time}${people ? ` ${people}` : ""}`);
    const body = `${summary}${floorHint ? ` ${floorHint}` : ""}`.trim();
    lines.push(`${indent}  ${body}`);

    const evidence = causalItem._evidenceChunk;
    if (evidence) {
        const speaker = evidence.speaker || "角色";
        const text = String(evidence.text || "").trim();
        lines.push(`${indent}  › #${evidence.floor + 1} [${speaker}] ${text}`);
    }

    return lines.join("\n");
}

/**
 * 重新编号事件文本
 * @param {string} text - 事件文本
 * @param {number} newIndex - 新编号
 * @returns {string}
 */
function renumberEventText(text, newIndex) {
    const s = String(text || "");
    return s.replace(/^(\s*)\d+(\.\s*(?:【)?)/, `$1${newIndex}$2`);
}

/**
 * 获取事件排序键
 * @param {object} ev - 事件对象
 * @returns {number}
 */
function getEventSortKey(ev) {
    const r = parseFloorRange(ev?.summary);
    if (r) return r.start;
    const m = String(ev?.id || "").match(/evt-(\d+)/);
    return m ? parseInt(m[1], 10) : Number.MAX_SAFE_INTEGER;
}

// ─────────────────────────────────────────────────────────────────────────────
// 非向量模式
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 构建非向量模式的 prompt
 * @param {object} store - summary store
 * @returns {string}
 */
function buildNonVectorPrompt(store) {
    const data = store.json || {};
    const sections = [];

    // L1 facts（非向量模式不做分层过滤，全量注入）
    const allFacts = getFacts();
    const factLines = allFacts
        .filter(f => !f.retracted)
        .sort((a, b) => (b.since || 0) - (a.since || 0))
        .map(f => {
            const since = f.since ? ` (#${f.since + 1})` : '';
            if (isRelationFact(f) && f.trend) {
                return `- ${f.s} ${f.p}: ${f.o} [${f.trend}]${since}`;
            }
            return `- ${f.s}的${f.p}: ${f.o}${since}`;
        });

    if (factLines.length) {
        sections.push(`[定了的事] 已确立的事实\n${factLines.join("\n")}`);
    }

    if (data.events?.length) {
        const lines = data.events.map((ev, i) => {
            const time = ev.timeLabel || "";
            const title = ev.title || "";
            const people = (ev.participants || []).join(" / ");
            const summary = cleanSummary(ev.summary);
            const header = time ? `${i + 1}.【${time}】${title || people}` : `${i + 1}. ${title || people}`;
            return `${header}\n  ${summary}`;
        });
        sections.push(`[剧情记忆]\n\n${lines.join("\n\n")}`);
    }

    if (data.arcs?.length) {
        const lines = data.arcs.map(formatArcLine);
        sections.push(`[人物弧光]\n${lines.join("\n")}`);
    }

    if (!sections.length) return "";

    return (
        `${buildSystemPreamble()}\n` +
        `<剧情记忆>\n\n${sections.join("\n\n")}\n\n</剧情记忆>\n` +
        `${buildPostscript()}`
    );
}

/**
 * 构建非向量模式的注入文本
 * @returns {string}
 */
export function buildNonVectorPromptText() {
    if (!getSettings().storySummary?.enabled) {
        return "";
    }

    const store = getSummaryStore();
    if (!store?.json) {
        return "";
    }

    let text = buildNonVectorPrompt(store);
    if (!text.trim()) {
        return "";
    }

    const cfg = getSummaryPanelConfig();
    if (cfg.trigger?.wrapperHead) text = cfg.trigger.wrapperHead + "\n" + text;
    if (cfg.trigger?.wrapperTail) text = text + "\n" + cfg.trigger.wrapperTail;

    return text;
}

// ─────────────────────────────────────────────────────────────────────────────
// 向量模式：预算装配
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 构建向量模式的 prompt
 * @param {object} store - summary store
 * @param {object} recallResult - 召回结果
 * @param {Map} causalById - 因果映射
 * @param {Array} focusEntities - 焦点实体
 * @param {object} meta - 元数据
 * @param {object} metrics - 指标对象
 * @returns {Promise<object>} {promptText, injectionLogText, injectionStats, metrics}
 */
async function buildVectorPrompt(store, recallResult, causalById, focusEntities = [], meta = null, metrics = null) {
    const T_Start = performance.now();

    const { chatId } = getContext();
    const data = store.json || {};
    const total = { used: 0, max: MAIN_BUDGET_MAX };

    // 预装配容器
    const assembled = {
        facts: { lines: [], tokens: 0 },
        arcs: { lines: [], tokens: 0 },
        events: { direct: [], similar: [] },
        orphans: { lines: [], tokens: 0 },
        recentOrphans: { lines: [], tokens: 0 },
    };

    const injectionStats = {
        budget: { max: TOTAL_BUDGET_MAX, used: 0 },
        facts: { count: 0, tokens: 0, filtered: 0 },
        arcs: { count: 0, tokens: 0 },
        events: { selected: 0, tokens: 0 },
        evidence: { attached: 0, tokens: 0 },
        orphans: { injected: 0, tokens: 0, l0Count: 0, contextPairs: 0 },
    };

    const recentOrphanStats = {
        injected: 0,
        tokens: 0,
        floorRange: "N/A",
        contextPairs: 0,
    };

    const details = {
        eventList: [],
        directCount: 0,
        similarCount: 0,
    };

    // ═══════════════════════════════════════════════════════════════════════
    // [优先级 1] 世界约束 - 最高优先级（带分层过滤）
    // ═══════════════════════════════════════════════════════════════════════

    const T_L1_Start = performance.now();

    const allFacts = getFacts();
    const knownCharacters = getKnownCharacters(store);
    const factLines = formatFactsForInjection(allFacts, focusEntities, knownCharacters);

    // METRICS: L1 指标
    if (metrics) {
        metrics.l1.factsTotal = allFacts.length;
        metrics.l1.factsFiltered = allFacts.length - factLines.length;
    }

    if (factLines.length) {
        const l1Budget = { used: 0, max: Math.min(L1_MAX, total.max - total.used) };
        for (const line of factLines) {
            if (!pushWithBudget(assembled.facts.lines, line, l1Budget)) break;
        }
        assembled.facts.tokens = l1Budget.used;
        total.used += l1Budget.used;
        injectionStats.facts.count = assembled.facts.lines.length;
        injectionStats.facts.tokens = l1Budget.used;
        injectionStats.facts.filtered = allFacts.length - factLines.length;

        // METRICS
        if (metrics) {
            metrics.l1.factsInjected = assembled.facts.lines.length;
            metrics.l1.tokens = l1Budget.used;
            metrics.l1.samples = assembled.facts.lines.slice(0, 3).map(line =>
                line.length > 60 ? line.slice(0, 60) + '...' : line
            );
            metrics.timing.l1Constraints = Math.round(performance.now() - T_L1_Start);
        }
    } else if (metrics) {
        metrics.timing.l1Constraints = Math.round(performance.now() - T_L1_Start);
    }

    // ═══════════════════════════════════════════════════════════════════════
    // [优先级 2] 人物弧光 - 预留预算
    // ═══════════════════════════════════════════════════════════════════════

    if (data.arcs?.length && total.used < total.max) {
        const { name1 } = getContext();
        const userName = String(name1 || "").trim();

        const relevant = new Set(
            [userName, ...(focusEntities || [])]
                .map(s => String(s || "").trim())
                .filter(Boolean)
        );

        const filtered = (data.arcs || []).filter(a => {
            const n = String(a?.name || "").trim();
            return n && relevant.has(n);
        });

        if (filtered.length) {
            const arcBudget = { used: 0, max: Math.min(ARCS_MAX, total.max - total.used) };
            for (const a of filtered) {
                const line = formatArcLine(a);
                if (!pushWithBudget(assembled.arcs.lines, line, arcBudget)) break;
            }
            assembled.arcs.tokens = arcBudget.used;
            total.used += arcBudget.used;
            injectionStats.arcs.count = assembled.arcs.lines.length;
            injectionStats.arcs.tokens = arcBudget.used;
        }
    }

    // ═══════════════════════════════════════════════════════════════════════
    // [优先级 3] 事件 + 证据
    // ═══════════════════════════════════════════════════════════════════════

    const recalledEvents = (recallResult?.events || []).filter(e => e?.event?.summary);
    const chunks = recallResult?.chunks || [];
    const usedChunkIds = new Set();

    /**
     * 为事件选择最佳证据 chunk
     * @param {object} eventObj - 事件对象
     * @returns {object|null} 最佳 chunk
     */

    // 优先 L0 虚拟 chunk，否则按 chunkIdx 选第一个
    function pickBestChunkForEvent(eventObj) {
        const range = parseFloorRange(eventObj?.summary);
        if (!range) return null;

        let best = null;
        for (const c of chunks) {
            if (usedChunkIds.has(c.chunkId)) continue;
            if (c.floor < range.start || c.floor > range.end) continue;
        
            if (!best) {
                best = c;
            } else if (c.isL0 && !best.isL0) {
                // L0 优先
                best = c;
            } else if (c.isL0 === best.isL0 && (c.chunkIdx ?? 0) < (best.chunkIdx ?? 0)) {
                // 同类型按 chunkIdx 选靠前的
                best = c;
            }
        }
        return best;
    }     

    /**
     * 格式化带证据的事件
     * @param {object} e - 事件召回项
     * @param {number} idx - 索引
     * @param {object|null} chunk - 证据 chunk
     * @returns {string}
     */
    function formatEventWithEvidence(e, idx, chunk) {
        const ev = e.event || {};
        const time = ev.timeLabel || "";
        const title = String(ev.title || "").trim();
        const people = (ev.participants || []).join(" / ").trim();
        const summary = cleanSummary(ev.summary);

        const displayTitle = title || people || ev.id || "事件";
        const header = time ? `${idx}.【${time}】${displayTitle}` : `${idx}. ${displayTitle}`;

        const lines = [header];
        if (people && displayTitle !== people) lines.push(`  ${people}`);
        lines.push(`  ${summary}`);

        for (const cid of ev.causedBy || []) {
            const c = causalById?.get(cid);
            if (c) lines.push(formatCausalEventLine(c, causalById));
        }

        if (chunk) {
            lines.push(`  ${formatChunkFullLine(chunk)}`);
        }

        return lines.join("\n");
    }

    const candidates = [...recalledEvents].sort((a, b) => (b.similarity || 0) - (a.similarity || 0));

    const selectedDirect = [];
    const selectedSimilar = [];

    for (let candidateRank = 0; candidateRank < candidates.length; candidateRank++) {
        const e = candidates[candidateRank];

        if (total.used >= total.max) break;

        const isDirect = e._recallType === "DIRECT";

        const bestChunk = pickBestChunkForEvent(e.event);

        let text = formatEventWithEvidence(e, 0, bestChunk);
        let cost = estimateTokens(text);
        let hasEvidence = !!bestChunk;
        let chosenChunk = bestChunk || null;

        if (total.used + cost > total.max) {
            text = formatEventWithEvidence(e, 0, null);
            cost = estimateTokens(text);
            hasEvidence = false;
            chosenChunk = null;

            if (total.used + cost > total.max) {
                continue;
            }
        }

        if (isDirect) {
            selectedDirect.push({ event: e.event, text, tokens: cost, chunk: chosenChunk, hasEvidence, candidateRank });
        } else {
            selectedSimilar.push({ event: e.event, text, tokens: cost, chunk: chosenChunk, hasEvidence, candidateRank });
        }

        injectionStats.events.selected++;
        total.used += cost;

        if (hasEvidence && bestChunk) {
            const chunkLine = formatChunkFullLine(bestChunk);
            const ct = estimateTokens(chunkLine);
            injectionStats.evidence.attached++;
            injectionStats.evidence.tokens += ct;
            usedChunkIds.add(bestChunk.chunkId);

            injectionStats.events.tokens += Math.max(0, cost - ct);
        } else {
            injectionStats.events.tokens += cost;
        }

        details.eventList.push({
            title: e.event?.title || e.event?.id,
            isDirect,
            hasEvidence,
            tokens: cost,
            similarity: e.similarity || 0,
            hasL0Evidence: bestChunk?.isL0 || false,
        });
    }

    // 重排
    selectedDirect.sort((a, b) => getEventSortKey(a.event) - getEventSortKey(b.event));
    selectedSimilar.sort((a, b) => getEventSortKey(a.event) - getEventSortKey(b.event));

    const selectedDirectTexts = selectedDirect.map((it, i) => {
        const numbered = renumberEventText(it.text, i + 1);
        return it.candidateRank < TOP_N_STAR ? `⭐${numbered}` : numbered;
    });

    const selectedSimilarTexts = selectedSimilar.map((it, i) => {
        const numbered = renumberEventText(it.text, i + 1);
        return it.candidateRank < TOP_N_STAR ? `⭐${numbered}` : numbered;
    });

    details.directCount = selectedDirect.length;
    details.similarCount = selectedSimilar.length;
    assembled.events.direct = selectedDirectTexts;
    assembled.events.similar = selectedSimilarTexts;

    // ═══════════════════════════════════════════════════════════════════════
    // [优先级 4] 远期片段（已总结范围的 orphan chunks）
    // ═══════════════════════════════════════════════════════════════════════

    const lastSummarized = store.lastSummarizedMesId ?? -1;
    const lastChunkFloor = meta?.lastChunkFloor ?? -1;
    const keepVisible = store.keepVisibleCount ?? 3;

    const orphanContextFloors = new Set();
    const orphanCandidates = chunks
        .filter(c => !usedChunkIds.has(c.chunkId))
        .filter(c => c.floor <= lastSummarized);

    for (const c of orphanCandidates) {
        if (c.isL0) continue;
        const pairFloor = getContextFloor(c);
        if (pairFloor >= 0) orphanContextFloors.add(pairFloor);
    }

    let contextChunksByFloor = new Map();
    if (chatId && orphanContextFloors.size > 0) {
        try {
            const contextChunks = await getChunksByFloors(chatId, Array.from(orphanContextFloors));
            for (const pc of contextChunks) {
                if (!contextChunksByFloor.has(pc.floor)) {
                    contextChunksByFloor.set(pc.floor, []);
                }
                contextChunksByFloor.get(pc.floor).push(pc);
            }
        } catch (e) {
            xbLog.warn(MODULE_ID, "获取配对chunks失败", e);
        }
    }

    if (orphanCandidates.length && total.used < total.max) {
        const orphans = orphanCandidates
            .sort((a, b) => (a.floor - b.floor) || ((a.chunkIdx ?? 0) - (b.chunkIdx ?? 0)));

        const l1Budget = { used: 0, max: Math.min(ORPHAN_MAX, total.max - total.used) };
        let l0Count = 0;
        let contextPairsCount = 0;

        for (const c of orphans) {
            if (c.isL0) {
                const line = formatChunkFullLine(c);
                if (!pushWithBudget(assembled.orphans.lines, line, l1Budget)) break;
                injectionStats.orphans.injected++;
                l0Count++;
                continue;
            }

            const pairFloor = getContextFloor(c);
            const pairCandidates = contextChunksByFloor.get(pairFloor) || [];
            const contextChunk = pickContextChunk(pairCandidates, c);

            const formattedLines = formatChunkWithContext(c, contextChunk);

            let allAdded = true;
            for (const line of formattedLines) {
                if (!pushWithBudget(assembled.orphans.lines, line, l1Budget)) {
                    allAdded = false;
                    break;
                }
            }

            if (!allAdded) break;

            injectionStats.orphans.injected++;
            if (contextChunk) contextPairsCount++;
        }

        assembled.orphans.tokens = l1Budget.used;
        total.used += l1Budget.used;
        injectionStats.orphans.tokens = l1Budget.used;
        injectionStats.orphans.l0Count = l0Count;
        injectionStats.orphans.contextPairs = contextPairsCount;
    }

    // ═══════════════════════════════════════════════════════════════════════
    // [独立预算] 待整理（未总结范围）
    // ═══════════════════════════════════════════════════════════════════════

    const recentStart = lastSummarized + 1;
    const recentEnd = lastChunkFloor - keepVisible;

    if (chunks.length && recentEnd >= recentStart) {
        const recentOrphanCandidates = chunks
            .filter(c => !usedChunkIds.has(c.chunkId))
            .filter(c => c.floor >= recentStart && c.floor <= recentEnd);

        const recentContextFloors = new Set();
        for (const c of recentOrphanCandidates) {
            if (c.isL0) continue;
            const pairFloor = getContextFloor(c);
            if (pairFloor >= 0) recentContextFloors.add(pairFloor);
        }

        let recentContextChunksByFloor = new Map();
        if (chatId && recentContextFloors.size > 0) {
            const newFloors = Array.from(recentContextFloors).filter(f => !contextChunksByFloor.has(f));
            if (newFloors.length > 0) {
                try {
                    const newContextChunks = await getChunksByFloors(chatId, newFloors);
                    for (const pc of newContextChunks) {
                        if (!contextChunksByFloor.has(pc.floor)) {
                            contextChunksByFloor.set(pc.floor, []);
                        }
                        contextChunksByFloor.get(pc.floor).push(pc);
                    }
                } catch (e) {
                    xbLog.warn(MODULE_ID, "获取近期配对chunks失败", e);
                }
            }
            recentContextChunksByFloor = contextChunksByFloor;
        }

        const recentOrphans = recentOrphanCandidates
            .sort((a, b) => (a.floor - b.floor) || ((a.chunkIdx ?? 0) - (b.chunkIdx ?? 0)));

        const recentBudget = { used: 0, max: RECENT_ORPHAN_MAX };
        let recentContextPairsCount = 0;

        for (const c of recentOrphans) {
            if (c.isL0) {
                const line = formatChunkFullLine(c);
                if (!pushWithBudget(assembled.recentOrphans.lines, line, recentBudget)) break;
                recentOrphanStats.injected++;
                continue;
            }

            const pairFloor = getContextFloor(c);
            const pairCandidates = recentContextChunksByFloor.get(pairFloor) || [];
            const contextChunk = pickContextChunk(pairCandidates, c);

            const formattedLines = formatChunkWithContext(c, contextChunk);

            let allAdded = true;
            for (const line of formattedLines) {
                if (!pushWithBudget(assembled.recentOrphans.lines, line, recentBudget)) {
                    allAdded = false;
                    break;
                }
            }

            if (!allAdded) break;

            recentOrphanStats.injected++;
            if (contextChunk) recentContextPairsCount++;
        }

        assembled.recentOrphans.tokens = recentBudget.used;
        recentOrphanStats.tokens = recentBudget.used;
        recentOrphanStats.floorRange = `${recentStart + 1}~${recentEnd + 1}楼`;
        recentOrphanStats.contextPairs = recentContextPairsCount;
    }

    // ═══════════════════════════════════════════════════════════════════════
    // 按注入顺序拼接 sections
    // ═══════════════════════════════════════════════════════════════════════

    const T_L4_Start = performance.now();

    const sections = [];

    if (assembled.facts.lines.length) {
        sections.push(`[定了的事] 已确立的事实\n${assembled.facts.lines.join("\n")}`);
    }
    if (assembled.events.direct.length) {
        sections.push(`[印象深的事] 记得很清楚\n\n${assembled.events.direct.join("\n\n")}`);
    }
    if (assembled.events.similar.length) {
        sections.push(`[好像有关的事] 听说过或有点模糊\n\n${assembled.events.similar.join("\n\n")}`);
    }
    if (assembled.orphans.lines.length) {
        sections.push(`[更早以前] 记忆里残留的老画面\n${assembled.orphans.lines.join("\n")}`);
    }
    if (assembled.recentOrphans.lines.length) {
        sections.push(`[近期] 清晰但还没整理\n${assembled.recentOrphans.lines.join("\n")}`);
    }
    if (assembled.arcs.lines.length) {
        sections.push(`[这些人] 他们的弧光\n${assembled.arcs.lines.join("\n")}`);
    }

    if (!sections.length) {
        if (metrics) {
            metrics.timing.l3Assembly = Math.round(performance.now() - T_Start - (metrics.timing.l1Constraints || 0));
            metrics.timing.l4Formatting = 0;
        }
        return { promptText: "", injectionLogText: "", injectionStats, metrics };
    }

    const promptText =
        `${buildSystemPreamble()}\n` +
        `<剧情记忆>\n\n${sections.join("\n\n")}\n\n</剧情记忆>\n` +
        `${buildPostscript()}`;

    // METRICS: 更新 L4 和 Budget 指标
    if (metrics) {
        // L4 指标
        metrics.l4.sectionsIncluded = [];
        if (assembled.facts.lines.length) metrics.l4.sectionsIncluded.push('constraints');
        if (assembled.events.direct.length) metrics.l4.sectionsIncluded.push('direct_events');
        if (assembled.events.similar.length) metrics.l4.sectionsIncluded.push('similar_events');
        if (assembled.orphans.lines.length) metrics.l4.sectionsIncluded.push('orphans');
        if (assembled.recentOrphans.lines.length) metrics.l4.sectionsIncluded.push('recent_orphans');
        if (assembled.arcs.lines.length) metrics.l4.sectionsIncluded.push('arcs');

        metrics.l4.formattingTime = Math.round(performance.now() - T_L4_Start);
        metrics.timing.l4Formatting = metrics.l4.formattingTime;

        // Budget 指标
        metrics.budget.total = total.used + (assembled.recentOrphans.tokens || 0);
        metrics.budget.limit = TOTAL_BUDGET_MAX;
        metrics.budget.utilization = Math.round(metrics.budget.total / TOTAL_BUDGET_MAX * 100);
        metrics.budget.breakdown = {
            constraints: assembled.facts.tokens,
            events: injectionStats.events.tokens + injectionStats.evidence.tokens,
            chunks: injectionStats.orphans.tokens,
            recentOrphans: recentOrphanStats.tokens || 0,
            arcs: assembled.arcs.tokens,
        };

        // L3 额外指标
        metrics.l3.tokens = injectionStats.orphans.tokens + (recentOrphanStats.tokens || 0);
        metrics.l3.contextPairsAdded = injectionStats.orphans.contextPairs + recentOrphanStats.contextPairs;
        metrics.l3.assemblyTime = Math.round(performance.now() - T_Start - (metrics.timing.l1Constraints || 0) - metrics.l4.formattingTime);
        metrics.timing.l3Assembly = metrics.l3.assemblyTime;

        // 质量指标
        const totalFacts = allFacts.length;
        metrics.quality.constraintCoverage = totalFacts > 0
            ? Math.round(assembled.facts.lines.length / totalFacts * 100)
            : 100;
        metrics.quality.eventPrecisionProxy = metrics.l2?.similarityDistribution?.mean || 0;

        const totalChunks = metrics.l3.chunksSelected || 0;
        const chunksWithEvents = injectionStats.evidence.attached;
        metrics.quality.evidenceDensity = totalChunks > 0
            ? Math.round(chunksWithEvents / totalChunks * 100)
            : 0;

        // 检测问题
        metrics.quality.potentialIssues = detectIssues(metrics);
    }

    return { promptText, injectionLogText: "", injectionStats, metrics };
}

// ─────────────────────────────────────────────────────────────────────────────
// 因果证据补充
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 为因果事件附加证据 chunk
 * @param {Array} causalEvents - 因果事件列表
 * @param {Map} eventVectorMap - 事件向量映射
 * @param {Map} chunkVectorMap - chunk 向量映射
 * @param {Map} chunksMap - chunk 映射
 */
async function attachEvidenceToCausalEvents(causalEvents, eventVectorMap, chunkVectorMap, chunksMap) {
    for (const c of causalEvents) {
        c._evidenceChunk = null;

        const ev = c.event;
        if (!ev?.id) continue;

        const evVec = eventVectorMap.get(ev.id);
        if (!evVec?.length) continue;

        const range = parseFloorRange(ev.summary);
        if (!range) continue;

        const candidateChunks = [];
        for (const [chunkId, chunk] of chunksMap) {
            if (chunk.floor >= range.start && chunk.floor <= range.end) {
                const vec = chunkVectorMap.get(chunkId);
                if (vec?.length) candidateChunks.push({ chunk, vec });
            }
        }
        if (!candidateChunks.length) continue;

        let best = null;
        let bestSim = -1;
        for (const { chunk, vec } of candidateChunks) {
            const sim = cosineSimilarity(evVec, vec);
            if (sim > bestSim) {
                bestSim = sim;
                best = chunk;
            }
        }

        if (best && bestSim > 0.3) {
            c._evidenceChunk = {
                floor: best.floor,
                speaker: best.speaker,
                text: best.text,
                similarity: bestSim,
            };
        }
    }
}

// ─────────────────────────────────────────────────────────────────────────────
// 向量模式：召回 + 注入
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 构建向量模式的注入文本
 * @param {boolean} excludeLastAi - 是否排除最后一条 AI 消息
 * @param {object} hooks - 钩子 {postToFrame, echo, pendingUserMessage}
 * @returns {Promise<object>} {text, logText}
 */
export async function buildVectorPromptText(excludeLastAi = false, hooks = {}) {
    const { postToFrame = null, echo = null, pendingUserMessage = null } = hooks;

    if (!getSettings().storySummary?.enabled) {
        return { text: "", logText: "" };
    }

    const { chat } = getContext();
    const store = getSummaryStore();

    if (!store?.json) {
        return { text: "", logText: "" };
    }

    const allEvents = store.json.events || [];
    const lastIdx = store.lastSummarizedMesId ?? 0;
    const length = chat?.length || 0;

    if (lastIdx >= length) {
        return { text: "", logText: "" };
    }

    const vectorCfg = getVectorConfig();
    if (!vectorCfg?.enabled) {
        return { text: "", logText: "" };
    }

    const { chatId } = getContext();
    const meta = chatId ? await getMeta(chatId) : null;

    let recallResult = null;
    let causalById = new Map();

    try {
        const queryText = buildQueryText(chat, 2, excludeLastAi);
        recallResult = await recallMemory(queryText, allEvents, vectorCfg, {
            excludeLastAi,
            pendingUserMessage,
        });

        recallResult = {
            ...recallResult,
            events: recallResult?.events || [],
            chunks: recallResult?.chunks || [],
            causalEvents: recallResult?.causalEvents || [],
            focusEntities: recallResult?.focusEntities || [],
            logText: recallResult?.logText || "",
            metrics: recallResult?.metrics || null,
        };

        // 给因果事件挂证据
        const causalEvents = recallResult.causalEvents || [];
        if (causalEvents.length > 0) {
            if (chatId) {
                try {
                    const floors = new Set();
                    for (const c of causalEvents) {
                        const r = parseFloorRange(c.event?.summary);
                        if (!r) continue;
                        for (let f = r.start; f <= r.end; f++) floors.add(f);
                    }

                    const [chunksList, chunkVecs, eventVecs] = await Promise.all([
                        getChunksByFloors(chatId, Array.from(floors)),
                        getAllChunkVectors(chatId),
                        getAllEventVectors(chatId),
                    ]);

                    const chunksMap = new Map(chunksList.map(c => [c.chunkId, c]));
                    const chunkVectorMap = new Map(chunkVecs.map(v => [v.chunkId, v.vector]));
                    const eventVectorMap = new Map(eventVecs.map(v => [v.eventId, v.vector]));

                    await attachEvidenceToCausalEvents(causalEvents, eventVectorMap, chunkVectorMap, chunksMap);
                } catch (e) {
                    xbLog.warn(MODULE_ID, "Causal evidence attachment failed", e);
                }
            }
        }

        causalById = new Map(
            recallResult.causalEvents
                .map(c => [c?.event?.id, c])
                .filter(x => x[0])
        );
    } catch (e) {
        xbLog.error(MODULE_ID, "向量召回失败", e);

        if (echo && canNotifyRecallFail()) {
            const msg = String(e?.message || "未知错误").replace(/\s+/g, " ").slice(0, 200);
            await echo(`/echo severity=warning 向量召回失败：${msg}`);
        }

        if (postToFrame) {
            postToFrame({
                type: "RECALL_LOG",
                text: `\n[Vector Recall Failed]\n${String(e?.stack || e?.message || e)}\n`,
            });
        }

        return { text: "", logText: `\n[Vector Recall Failed]\n${String(e?.stack || e?.message || e)}\n` };
    }

    const hasUseful =
        (recallResult?.events?.length || 0) > 0 ||
        (recallResult?.chunks?.length || 0) > 0 ||
        (recallResult?.causalEvents?.length || 0) > 0;

    if (!hasUseful) {
        if (echo && canNotifyRecallFail()) {
            await echo(
                "/echo severity=warning 向量召回失败：没有可用召回结果（请先在面板中生成向量，或检查指纹不匹配）"
            );
        }
        if (postToFrame) {
            postToFrame({
                type: "RECALL_LOG",
                text: "\n[Vector Recall Empty]\nNo recall candidates / vectors not ready.\n",
            });
        }
        return { text: "", logText: "\n[Vector Recall Empty]\nNo recall candidates / vectors not ready.\n" };
    }

    // 拼装向量 prompt，传入 focusEntities 和 metrics
    const { promptText, metrics: promptMetrics } = await buildVectorPrompt(
        store,
        recallResult,
        causalById,
        recallResult?.focusEntities || [],
        meta,
        recallResult?.metrics || null
    );

    // wrapper
    const cfg = getSummaryPanelConfig();
    let finalText = String(promptText || "");
    if (cfg.trigger?.wrapperHead) finalText = cfg.trigger.wrapperHead + "\n" + finalText;
    if (cfg.trigger?.wrapperTail) finalText = finalText + "\n" + cfg.trigger.wrapperTail;

    // METRICS: 生成完整的指标日志
    const metricsLogText = promptMetrics ? formatMetricsLog(promptMetrics) : '';

    // 发给 iframe
    if (postToFrame) {
        postToFrame({ type: "RECALL_LOG", text: metricsLogText });
    }

    return { text: finalText, logText: metricsLogText };
}