// ═══════════════════════════════════════════════════════════════════════════
// Story Summary - Prompt Injection (v5 - Two-Stage: L0 Locate → L1 Evidence)
//
// 命名规范：
// - 存储层用 L0/L1/L2/L3（StateAtom/Chunk/Event/Fact）
// - 装配层用语义名称：constraint/event/evidence/arc
//
// 架构变更（v4 → v5）：
// - L0 和 L1 不再在同一个池子竞争
// - recall.js 返回 {l0Selected[], l1ByFloor: Map} 而非 evidenceChunks[]
// - 装配层按 L2→L0→L1 层级组织
// - 预算以"L0 + USER top-1 + AI top-1"为原子单元
// - 孤立 L1（无对应 L0）丢弃
// - 孤立 L0（无对应 L1）保留
//
// 职责：
// - 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 } from "../vector/retrieval/recall.js";
import { 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;

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 DISTANT_EVIDENCE_MAX = 2500;
const RECENT_EVIDENCE_MAX = 5000;
const TOTAL_BUDGET_MAX = 15000;
const CONSTRAINT_MAX = 2000;
const ARCS_MAX = 1500;
const TOP_N_STAR = 5;

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

/**
 * 估算文本 token 数量
 * @param {string} text - 输入文本
 * @returns {number} token 估算值
 */
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);
}

/**
 * 带预算限制的行追加
 * @param {string[]} lines - 行数组
 * @param {string} text - 要追加的文本
 * @param {object} state - 预算状态 {used, max}
 * @returns {boolean} 是否追加成功
 */
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;
}

/**
 * 解析事件摘要中的楼层范围
 * @param {string} summary - 事件摘要
 * @returns {{start: number, end: number}|null} 楼层范围
 */
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 };
}

/**
 * 清理事件摘要（移除楼层标记）
 * @param {string} summary - 事件摘要
 * @returns {string} 清理后的摘要
 */
function cleanSummary(summary) {
    return String(summary || "")
        .replace(/\s*\(#\d+(?:-\d+)?\)\s*$/, "")
        .trim();
}

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

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

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

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

/**
 * 构建系统前导文本
 * @returns {string} 前导文本
 */
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");
}

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

// ─────────────────────────────────────────────────────────────────────────────
// [Constraints] L3 Facts 过滤与格式化
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 获取已知角色集合
 * @param {object} store - 存储对象
 * @returns {Set<string>} 角色名称集合（标准化后）
 */
function getKnownCharacters(store) {
    const names = new Set();

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

    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));
    }

    const { name1, name2 } = getContext();
    if (name1) names.add(normalize(name1));
    if (name2) names.add(normalize(name2));

    return names;
}

/**
 * 解析关系谓词中的目标
 * @param {string} predicate - 谓词
 * @returns {string|null} 目标名称
 */
function parseRelationTarget(predicate) {
    const match = String(predicate || '').match(/^对(.+)的/);
    return match ? match[1] : null;
}

/**
 * 按相关性过滤 facts
 * @param {object[]} facts - 所有 facts
 * @param {string[]} focusEntities - 焦点实体
 * @param {Set<string>} knownCharacters - 已知角色
 * @returns {object[]} 过滤后的 facts
 */
function filterConstraintsByRelevance(facts, focusEntities, knownCharacters) {
    if (!facts?.length) return [];

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

    return facts.filter(f => {
        if (f._isState === true) return true;

        if (isRelationFact(f)) {
            const from = normalize(f.s);
            const target = parseRelationTarget(f.p);
            const to = target ? normalize(target) : '';

            if (focusSet.has(from) || focusSet.has(to)) return true;
            return false;
        }

        const subjectNorm = normalize(f.s);
        if (knownCharacters.has(subjectNorm)) {
            return focusSet.has(subjectNorm);
        }

        return true;
    });
}

/**
 * 格式化 constraints 用于注入
 * @param {object[]} facts - 所有 facts
 * @param {string[]} focusEntities - 焦点实体
 * @param {Set<string>} knownCharacters - 已知角色
 * @returns {string[]} 格式化后的行
 */
function formatConstraintsForInjection(facts, focusEntities, knownCharacters) {
    const filtered = filterConstraintsByRelevance(facts, focusEntities, knownCharacters);

    if (!filtered.length) return [];

    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
// ─────────────────────────────────────────────────────────────────────────────

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

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

/**
 * 格式化 L0 锚点行
 * @param {object} l0 - L0 对象
 * @returns {string} 格式化后的行
 */
function formatL0Line(l0) {
    return `  › #${l0.floor + 1} [📌] ${String(l0.text || l0.atom?.semantic || "").trim()}`;
}

/**
 * 格式化 L1 chunk 行（挂在 L0 下方）
 * @param {object} chunk - L1 chunk 对象
 * @param {boolean} isContext - 是否为上下文（USER 侧）
 * @returns {string} 格式化后的行
 */
function formatL1Line(chunk, isContext) {
    const { name1, name2 } = getContext();
    const speaker = chunk.isUser ? (name1 || "用户") : (chunk.speaker || name2 || "角色");
    const text = String(chunk.text || "").trim();
    const symbol = isContext ? "┌" : "›";
    return `    ${symbol} #${chunk.floor + 1} [${speaker}] ${text}`;
}

/**
 * 格式化因果事件行
 * @param {object} causalItem - 因果事件项
 * @returns {string} 格式化后的行
 */
function formatCausalEventLine(causalItem) {
    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}`);

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

// ─────────────────────────────────────────────────────────────────────────────
// L0→L1 证据单元构建
// ─────────────────────────────────────────────────────────────────────────────

/**
 * @typedef {object} EvidenceUnit
 * @property {object} l0 - L0 锚点对象
 * @property {object|null} userL1 - USER 侧 top-1 L1 chunk
 * @property {object|null} aiL1 - AI 侧 top-1 L1 chunk
 * @property {number} totalTokens - 整个单元的 token 估算
 */

/**
 * 为一个 L0 构建证据单元
 * @param {object} l0 - L0 对象
 * @param {Map<number, object>} l1ByFloor - 楼层→L1配对映射
 * @returns {EvidenceUnit}
 */
function buildEvidenceUnit(l0, l1ByFloor) {
    const pair = l1ByFloor.get(l0.floor);
    const userL1 = pair?.userTop1 || null;
    const aiL1 = pair?.aiTop1 || null;

    // 预计算整个单元的 token 开销
    let totalTokens = estimateTokens(formatL0Line(l0));
    if (userL1) totalTokens += estimateTokens(formatL1Line(userL1, true));
    if (aiL1) totalTokens += estimateTokens(formatL1Line(aiL1, false));

    return { l0, userL1, aiL1, totalTokens };
}

/**
 * 格式化一个证据单元为文本行
 * @param {EvidenceUnit} unit - 证据单元
 * @returns {string[]} 文本行数组
 */
function formatEvidenceUnit(unit) {
    const lines = [];
    lines.push(formatL0Line(unit.l0));
    if (unit.userL1) {
        lines.push(formatL1Line(unit.userL1, true));
    }
    if (unit.aiL1) {
        lines.push(formatL1Line(unit.aiL1, false));
    }
    return lines;
}

// ─────────────────────────────────────────────────────────────────────────────
// 事件证据收集
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 为事件收集范围内的 L0 证据单元
 * @param {object} eventObj - 事件对象
 * @param {object[]} l0Selected - 所有选中的 L0
 * @param {Map<number, object>} l1ByFloor - 楼层→L1配对映射
 * @param {Set<string>} usedL0Ids - 已消费的 L0 ID 集合（会被修改）
 * @returns {EvidenceUnit[]} 该事件的证据单元列表
 */
function collectEvidenceForEvent(eventObj, l0Selected, l1ByFloor, usedL0Ids) {
    const range = parseFloorRange(eventObj?.summary);
    if (!range) return [];

    const units = [];

    for (const l0 of l0Selected) {
        if (usedL0Ids.has(l0.id)) continue;
        if (l0.floor < range.start || l0.floor > range.end) continue;

        const unit = buildEvidenceUnit(l0, l1ByFloor);
        units.push(unit);
        usedL0Ids.add(l0.id);
    }

    // 按楼层排序
    units.sort((a, b) => a.l0.floor - b.l0.floor);

    return units;
}

// ─────────────────────────────────────────────────────────────────────────────
// 事件格式化（L2→L0→L1 层级）
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 格式化事件（含 L0→L1 证据）
 * @param {object} eventItem - 事件召回项
 * @param {number} idx - 编号
 * @param {EvidenceUnit[]} evidenceUnits - 该事件的证据单元
 * @param {Map<string, object>} causalById - 因果事件索引
 * @returns {string} 格式化后的文本
 */
function formatEventWithEvidence(eventItem, idx, evidenceUnits, causalById) {
    const ev = eventItem.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}`);

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

    // L0→L1 证据单元
    for (const unit of evidenceUnits) {
        lines.push(...formatEvidenceUnit(unit));
    }

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

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

/**
 * 构建非向量模式注入文本
 * @param {object} store - 存储对象
 * @returns {string} 注入文本
 */
function buildNonVectorPrompt(store) {
    const data = store.json || {};
    const sections = [];

    // [Constraints] L3 Facts
    const allFacts = getFacts();
    const constraintLines = 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 (constraintLines.length) {
        sections.push(`[定了的事] 已确立的事实\n${constraintLines.join("\n")}`);
    }

    // [Events] L2 Events
    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")}`);
    }

    // [Arcs]
    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()}`
    );
}

/**
 * 构建非向量模式注入文本（公开接口）
 * @returns {string} 注入文本
 */
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
// ─────────────────────────────────────────────────────────────────────────────

/**
 * 构建向量模式注入文本
 * @param {object} store - 存储对象
 * @param {object} recallResult - 召回结果
 * @param {Map<string, object>} causalById - 因果事件索引
 * @param {string[]} focusEntities - 焦点实体
 * @param {object} meta - 元数据
 * @param {object} metrics - 指标对象
 * @returns {Promise<{promptText: string, injectionStats: object, metrics: object}>}
 */
async function buildVectorPrompt(store, recallResult, causalById, focusEntities, meta, metrics) {
    const T_Start = performance.now();

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

    // 从 recallResult 解构
    const l0Selected = recallResult?.l0Selected || [];
    const l1ByFloor = recallResult?.l1ByFloor || new Map();

    // 装配结果
    const assembled = {
        constraints: { lines: [], tokens: 0 },
        directEvents: { lines: [], tokens: 0 },
        relatedEvents: { lines: [], tokens: 0 },
        distantEvidence: { lines: [], tokens: 0 },
        recentEvidence: { lines: [], tokens: 0 },
        arcs: { lines: [], tokens: 0 },
    };

    // 注入统计
    const injectionStats = {
        budget: { max: TOTAL_BUDGET_MAX, used: 0 },
        constraint: { count: 0, tokens: 0, filtered: 0 },
        arc: { count: 0, tokens: 0 },
        event: { selected: 0, tokens: 0 },
        evidence: { l0InEvents: 0, l1InEvents: 0, tokens: 0 },
        distantEvidence: { units: 0, tokens: 0 },
        recentEvidence: { units: 0, tokens: 0 },
    };

    const eventDetails = {
        list: [],
        directCount: 0,
        relatedCount: 0,
    };

    // 已消费的 L0 ID 集合（事件区域消费后，evidence 区域不再重复）
    const usedL0Ids = new Set();

    // ═══════════════════════════════════════════════════════════════════════
    // [Constraints] L3 Facts → 世界约束
    // ═══════════════════════════════════════════════════════════════════════

    const T_Constraint_Start = performance.now();

    const allFacts = getFacts();
    const knownCharacters = getKnownCharacters(store);
    const constraintLines = formatConstraintsForInjection(allFacts, focusEntities, knownCharacters);

    if (metrics) {
        metrics.constraint.total = allFacts.length;
        metrics.constraint.filtered = allFacts.length - constraintLines.length;
    }

    if (constraintLines.length) {
        const constraintBudget = { used: 0, max: Math.min(CONSTRAINT_MAX, total.max - total.used) };
        for (const line of constraintLines) {
            if (!pushWithBudget(assembled.constraints.lines, line, constraintBudget)) break;
        }
        assembled.constraints.tokens = constraintBudget.used;
        total.used += constraintBudget.used;
        injectionStats.constraint.count = assembled.constraints.lines.length;
        injectionStats.constraint.tokens = constraintBudget.used;
        injectionStats.constraint.filtered = allFacts.length - constraintLines.length;

        if (metrics) {
            metrics.constraint.injected = assembled.constraints.lines.length;
            metrics.constraint.tokens = constraintBudget.used;
            metrics.constraint.samples = assembled.constraints.lines.slice(0, 3).map(line =>
                line.length > 60 ? line.slice(0, 60) + '...' : line
            );
            metrics.timing.constraintFilter = Math.round(performance.now() - T_Constraint_Start);
        }
    } else if (metrics) {
        metrics.timing.constraintFilter = Math.round(performance.now() - T_Constraint_Start);
    }

    // ═══════════════════════════════════════════════════════════════════════
    // [Arcs] 人物弧光
    // ═══════════════════════════════════════════════════════════════════════

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

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

    // ═══════════════════════════════════════════════════════════════════════
    // [Events] L2 Events → 直接命中 + 相似命中 + 因果链 + L0→L1 证据
    // ═══════════════════════════════════════════════════════════════════════
    const eventHits = (recallResult?.events || []).filter(e => e?.event?.summary);

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

    const selectedDirect = [];
    const selectedRelated = [];

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

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

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

        // 收集该事件范围内的 L0→L1 证据单元
        const evidenceUnits = collectEvidenceForEvent(e.event, l0Selected, l1ByFloor, usedL0Ids);

        // 格式化事件（含证据）
        const text = formatEventWithEvidence(e, 0, evidenceUnits, causalById);
        const cost = estimateTokens(text);

        // 预算检查：整个事件（含证据）作为原子单元
        if (total.used + cost > total.max) {
            // 尝试不带证据的版本
            const textNoEvidence = formatEventWithEvidence(e, 0, [], causalById);
            const costNoEvidence = estimateTokens(textNoEvidence);

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

            // 放入不带证据的版本，归还已消费的 L0 ID
            for (const unit of evidenceUnits) {
                usedL0Ids.delete(unit.l0.id);
            }

            if (isDirect) {
                selectedDirect.push({
                    event: e.event, text: textNoEvidence, tokens: costNoEvidence,
                    evidenceUnits: [], candidateRank,
                });
            } else {
                selectedRelated.push({
                    event: e.event, text: textNoEvidence, tokens: costNoEvidence,
                    evidenceUnits: [], candidateRank,
                });
            }

            injectionStats.event.selected++;
            injectionStats.event.tokens += costNoEvidence;
            total.used += costNoEvidence;

            eventDetails.list.push({
                title: e.event?.title || e.event?.id,
                isDirect,
                hasEvidence: false,
                tokens: costNoEvidence,
                similarity: e.similarity || 0,
                l0Count: 0,
                l1Count: 0,
            });

            continue;
        }

        // 预算充足，放入完整版本
        const l0Count = evidenceUnits.length;
        let l1Count = 0;
        for (const unit of evidenceUnits) {
            if (unit.userL1) l1Count++;
            if (unit.aiL1) l1Count++;
        }

        if (isDirect) {
            selectedDirect.push({
                event: e.event, text, tokens: cost,
                evidenceUnits, candidateRank,
            });
        } else {
            selectedRelated.push({
                event: e.event, text, tokens: cost,
                evidenceUnits, candidateRank,
            });
        }

        injectionStats.event.selected++;
        injectionStats.event.tokens += cost;
        injectionStats.evidence.l0InEvents += l0Count;
        injectionStats.evidence.l1InEvents += l1Count;
        total.used += cost;

        eventDetails.list.push({
            title: e.event?.title || e.event?.id,
            isDirect,
            hasEvidence: l0Count > 0,
            tokens: cost,
            similarity: e.similarity || 0,
            l0Count,
            l1Count,
        });
    }

    // 排序
    selectedDirect.sort((a, b) => getEventSortKey(a.event) - getEventSortKey(b.event));
    selectedRelated.sort((a, b) => getEventSortKey(a.event) - getEventSortKey(b.event));

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

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

    eventDetails.directCount = selectedDirect.length;
    eventDetails.relatedCount = selectedRelated.length;
    assembled.directEvents.lines = directEventTexts;
    assembled.relatedEvents.lines = relatedEventTexts;

    // ═══════════════════════════════════════════════════════════════════════
    // [Evidence - Distant] 远期证据（已总结范围，未被事件消费的 L0→L1）
    // ═══════════════════════════════════════════════════════════════════════

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

    // 收集未被事件消费的 L0，按 rerankScore 降序
    const remainingL0 = l0Selected
        .filter(l0 => !usedL0Ids.has(l0.id))
        .sort((a, b) => (b.rerankScore || 0) - (a.rerankScore || 0));

    // 远期：floor <= lastSummarized
    const distantL0 = remainingL0.filter(l0 => l0.floor <= lastSummarized);

    if (distantL0.length && total.used < total.max) {
        const distantBudget = { used: 0, max: Math.min(DISTANT_EVIDENCE_MAX, total.max - total.used) };

        // 按楼层排序（时间顺序）
        distantL0.sort((a, b) => a.floor - b.floor);

        for (const l0 of distantL0) {
            const unit = buildEvidenceUnit(l0, l1ByFloor);

            // 原子单元预算检查
            if (distantBudget.used + unit.totalTokens > distantBudget.max) continue;

            const unitLines = formatEvidenceUnit(unit);
            for (const line of unitLines) {
                assembled.distantEvidence.lines.push(line);
            }
            distantBudget.used += unit.totalTokens;
            usedL0Ids.add(l0.id);
            injectionStats.distantEvidence.units++;
        }

        assembled.distantEvidence.tokens = distantBudget.used;
        total.used += distantBudget.used;
        injectionStats.distantEvidence.tokens = distantBudget.used;
    }

    // ═══════════════════════════════════════════════════════════════════════
    // [Evidence - Recent] 近期证据（未总结范围，独立预算）
    // ═══════════════════════════════════════════════════════════════════════

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

    if (recentEnd >= recentStart) {
        const recentL0 = remainingL0
            .filter(l0 => !usedL0Ids.has(l0.id))
            .filter(l0 => l0.floor >= recentStart && l0.floor <= recentEnd);

        if (recentL0.length) {
            const recentBudget = { used: 0, max: RECENT_EVIDENCE_MAX };

            // 按楼层排序（时间顺序）
            recentL0.sort((a, b) => a.floor - b.floor);

            for (const l0 of recentL0) {
                const unit = buildEvidenceUnit(l0, l1ByFloor);

                if (recentBudget.used + unit.totalTokens > recentBudget.max) continue;

                const unitLines = formatEvidenceUnit(unit);
                for (const line of unitLines) {
                    assembled.recentEvidence.lines.push(line);
                }
                recentBudget.used += unit.totalTokens;
                usedL0Ids.add(l0.id);
                injectionStats.recentEvidence.units++;
            }

            assembled.recentEvidence.tokens = recentBudget.used;
            injectionStats.recentEvidence.tokens = recentBudget.used;
        }
    }

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

    const T_Format_Start = performance.now();

    const sections = [];

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

    if (!sections.length) {
        if (metrics) {
            metrics.timing.evidenceAssembly = Math.round(performance.now() - T_Start - (metrics.timing.constraintFilter || 0));
            metrics.timing.formatting = 0;
        }
        return { promptText: "", injectionStats, metrics };
    }

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

    if (metrics) {
        metrics.formatting.sectionsIncluded = [];
        if (assembled.constraints.lines.length) metrics.formatting.sectionsIncluded.push('constraints');
        if (assembled.directEvents.lines.length) metrics.formatting.sectionsIncluded.push('direct_events');
        if (assembled.relatedEvents.lines.length) metrics.formatting.sectionsIncluded.push('related_events');
        if (assembled.distantEvidence.lines.length) metrics.formatting.sectionsIncluded.push('distant_evidence');
        if (assembled.recentEvidence.lines.length) metrics.formatting.sectionsIncluded.push('recent_evidence');
        if (assembled.arcs.lines.length) metrics.formatting.sectionsIncluded.push('arcs');

        metrics.formatting.time = Math.round(performance.now() - T_Format_Start);
        metrics.timing.formatting = metrics.formatting.time;

        metrics.budget.total = total.used + (assembled.recentEvidence.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.constraints.tokens,
            events: injectionStats.event.tokens,
            distantEvidence: injectionStats.distantEvidence.tokens,
            recentEvidence: injectionStats.recentEvidence.tokens,
            arcs: assembled.arcs.tokens,
        };

        metrics.evidence.tokens = injectionStats.distantEvidence.tokens + injectionStats.recentEvidence.tokens;
        metrics.evidence.assemblyTime = Math.round(
            performance.now() - T_Start - (metrics.timing.constraintFilter || 0) - metrics.formatting.time
        );
        metrics.timing.evidenceAssembly = metrics.evidence.assemblyTime;

        const totalFacts = allFacts.length;
        metrics.quality.constraintCoverage = totalFacts > 0
            ? Math.round(assembled.constraints.lines.length / totalFacts * 100)
            : 100;
        metrics.quality.eventPrecisionProxy = metrics.event?.similarityDistribution?.mean || 0;

        const totalL0Selected = l0Selected.length;
        const l0WithL1 = l0Selected.filter(l0 => {
            const pair = l1ByFloor.get(l0.floor);
            return pair?.aiTop1 || pair?.userTop1;
        }).length;
        metrics.quality.l1AttachRate = totalL0Selected > 0
            ? Math.round(l0WithL1 / totalL0Selected * 100)
            : 0;

        metrics.quality.potentialIssues = detectIssues(metrics);
    }

    return { promptText, injectionStats, metrics };
}

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

/**
 * 构建向量模式注入文本（公开接口）
 * @param {boolean} excludeLastAi - 是否排除最后的 AI 消息
 * @param {object} hooks - 钩子函数
 * @returns {Promise<{text: string, logText: string}>}
 */
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 {
        recallResult = await recallMemory(allEvents, vectorCfg, {
            excludeLastAi,
            pendingUserMessage,
        });

        recallResult = {
            ...recallResult,
            events: recallResult?.events || [],
            l0Selected: recallResult?.l0Selected || [],
            l1ByFloor: recallResult?.l1ByFloor || new Map(),
            causalChain: recallResult?.causalChain || [],
            focusEntities: recallResult?.focusEntities || [],
            metrics: recallResult?.metrics || null,
        };

        // 构建因果事件索引
        causalById = new Map(
            (recallResult.causalChain || [])
                .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?.l0Selected?.length || 0) > 0 ||
        (recallResult?.causalChain?.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" };
    }

    const { promptText, metrics: promptMetrics } = await buildVectorPrompt(
        store,
        recallResult,
        causalById,
        recallResult?.focusEntities || [],
        meta,
        recallResult?.metrics || null
    );

    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;

    const metricsLogText = promptMetrics ? formatMetricsLog(promptMetrics) : '';

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

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