/** 预警处置模式三块聚合接口（票 19）。 */
import { districtQuery, industryQuery } from '../domain/filterOptions.js'
import { toEventAnalysis, toEventHistory, toHandlingEfficiency } from '../domain/warningResponsePanels.js'
import { fetchSection, isEmptyBy } from './domainRequest.js'
import { eventTimeWindow, historyWindows } from '../domain/eventRange.js'
import { SECTION_STATE, section } from '../domain/sectionState.js'
import { sortEventRows } from '../domain/eventList.js'
import { PAGE_SIZE, serverPageView } from '../domain/pagination.js'
import { REQUEST_REASON } from '../domain/requestReason.js'

export const WARNING_RESPONSE_PATHS = {
    history: '/events/history-analysis',
    efficiency: '/events/handling-efficiency',
    analysis: '/events/multidimensional-analysis',
}

const freshnessOf = (payload) => (payload && payload.freshness && (payload.freshness.status || payload.freshness.state)) || ''
const familyParam = (mode) => (mode === 'ALARM' ? 'ALARM' : 'WARNING')

/** 多窗合并时每窗的取数上限（后端 `pageSize` 上限 1000）：把每个窗已加载的逐事件行
 * 全取下再合并，前端对合并集合分页（多窗不存在全局页，见规范三分法）。 */
const HISTORY_WINDOW_MAX_PAGE_SIZE = 1000

/**
 * 请求范围类型 → 前端范围键（`7d`/`30d`/`90d`）。响应里的 `range.type` 是后端
 * `TREND_WINDOW`（显式起止时间时不回显预设范围），所以**范围键由请求侧带出**，
 * 供渲染层做「范围变化回第 1 页」的页码归属键（条文 5/6）。
 */
const RANGE_KEY_BY_TYPE = { LAST_7_DAYS: '7d', LAST_30_DAYS: '30d', LAST_90_DAYS: '90d' }

/**
 * 片区入参的落点（票 67，2026-10-22 逐端点实测）。
 *
 * 事件族四个端点里**只有** `/events/multidimensional-analysis`（预警分析）真收 `district`：
 * 非法值 400、`district=0/1` 的桶计数不同。另外三个（当前事件 / 历史事件 / 处置效率）
 * 实测**完全不认**该参数（非法值也 200、响应逐字节相同），所以本文件只给分析端点下发，
 * 其余一律不下发 —— 给不认的端点塞参数是「伪装的筛选」，比不筛更坏（票 67 的验收纪律）。
 *
 * 同一族里「一块随片区变、三块不变」这件事，界面上由 `domain/filterCaliber.js` 的
 * 面板口径说明如实交代（概览模式的行业筛选早就是同一形态的先例）。
 */
function rangeParams(options) {
    const window = options.startTime && options.endTime ? options : eventTimeWindow(options.rangeType)
    return { range: options.rangeType, startTime: window.startTime, endTime: window.endTime }
}

/**
 * 历史事件（票 19 聚合接口；票 61 改成「单窗服务端分页 / 多窗合并前端分页」）：
 *
 *   · **单窗**（近 7 天）：`page`/`pageSize=10` 进查询串，后端回当前页的逐事件行 +
 *     `pagination`，`data.paging` 记 `mode:'server'`；
 *   · **多窗**（近 30/90 天，单请求上限 31 天为后端契约）：每窗取到上限 1000 条后
 *     合并去重并按后端同一条排序口径重排，`data.paging` 记 `mode:'merged'` 与
 *     `windowCount`/`loaded`——没有「全局页」，页脚必须如实说明，不伪造页码。
 *
 * 顶层失败/窗口回显不一致的收口与既有逻辑一致；竞态（迟到响应丢弃）由 eventStore 的
 * token 纪律承担。
 */
export async function fetchEventHistory(options = {}) {
    const range = rangeParams(options)
    const windows = historyWindows(range.startTime, range.endTime)
    const singleWindow = windows.length === 1
    const requestedPage = Number.isInteger(options.page) && options.page > 0 ? options.page : 1
    const results = await Promise.all(
        windows.map((window) =>
            fetchHistoryWindow({
                ...options,
                ...window,
                page: singleWindow ? requestedPage : 1,
                pageSize: singleWindow ? PAGE_SIZE : HISTORY_WINDOW_MAX_PAGE_SIZE,
            }),
        ),
    )
    const failed = results.find((result) => ![SECTION_STATE.SUCCESS, SECTION_STATE.STALE, SECTION_STATE.EMPTY].includes(result.state))
    if (failed) return failed
    const hour = (value) => Math.floor(Date.parse(value) / 3600000)
    const mismatch = results.some((result, index) => result.mode === 'real' && result.data &&
        (hour(result.data.range?.start) !== hour(windows[index].startTime) || hour(result.data.range?.end) !== hour(windows[index].endTime)))
    if (mismatch) return section(SECTION_STATE.FAILED, { mode: 'real', reason: '历史接口回显窗口与所选范围不一致，请检查后端时间参数。' })
    const populated = results.filter((result) => result.data)
    if (!populated.length) return results[0] || section(SECTION_STATE.EMPTY)
    const rows = new Map()
    const events = new Map()
    for (const result of populated) {
        for (const row of result.data.trend || []) rows.set(row.bucket, row)
        for (const event of result.data.events || []) events.set(event.code, event)
    }
    const first = populated[0]
    const retained = results.some((result) => result.state === SECTION_STATE.STALE)
    const mergedEvents = sortEventRows([...events.values()])
    const rangeKey = RANGE_KEY_BY_TYPE[options.rangeType] || ''
    const paging = singleWindow
        ? { mode: 'server', windowCount: 1, rangeKey, ...serverPageView(first.data && first.data.pagination, mergedEvents.length) }
        : { mode: 'merged', windowCount: windows.length, loaded: mergedEvents.length, total: mergedEvents.length, rangeKey }
    return section(retained ? SECTION_STATE.STALE : SECTION_STATE.SUCCESS, {
        mode: first.mode,
        retained,
        data: {
            ...first.data,
            trend: [...rows.values()].sort((a, b) => String(a.bucket).localeCompare(String(b.bucket))),
            events: mergedEvents,
            range: { key: '', type: options.rangeType || '', start: range.startTime, end: range.endTime },
            missing: [...new Set(populated.flatMap((result) => result.data.missing || []))],
            // 单窗：服务端页码视图；多窗：只有「已加载集合」口径（无全局页）。
            paging,
            pagination: singleWindow ? (first.data && first.data.pagination) || null : null,
        },
    })
}

function fetchHistoryWindow(options = {}) {
    return fetchSection(WARNING_RESPONSE_PATHS.history, {
        params: {
            eventFamily: familyParam(options.mode),
            industry: industryQuery(options.industry),
            ...rangeParams(options),
            page: options.page,
            pageSize: options.pageSize,
        },
        toData: toEventHistory,
        isEmpty: isEmptyBy((payload) => {
            if (Array.isArray(payload && payload.rows)) return payload.rows.length === 0
            const section = payload && payload.sections && payload.sections.events
            return Array.isArray(section && section.data) ? section.data.length === 0 : Array.isArray(payload && payload.data) && payload.data.length === 0
        }),
        freshnessOf,
        config: options.config,
        fetchImpl: options.fetchImpl,
    })
}

/**
 * 聚合端点的**多窗取数 + 合并**（票 75）。
 *
 * 后端契约是「单请求 ≤31 天」（实测 90 天显式窗口 → `400 efficiency window must not exceed 31 days`），
 * 但按 30 天切窗后逐窗请求全部 200 —— 所以 90 天的支持放在**前端消费侧**：用与票 61
 * （历史事件多窗合并）同一段 `historyWindows` 切窗，逐窗取原始载荷，合并后再过一次域转换。
 *
 * 为什么在**原始 JSON 层**合并而不是域对象层：`toHandlingEfficiency`/`toEventAnalysis` 的
 * 输入是后端形状，合并产物只要长得像"一次大窗口的响应"，两条既有转换就一行不用改 ——
 * 单窗路径与多窗路径最后走同一段域转换，不会分叉出两套口径。
 *
 * 失败语义（票 61 同一条纪律）：任一窗失败 → 整分区 FAILED（不把 3/4 窗的数冒充 90 天）；
 * 有窗 STALE → 整体 STALE（retained：有值但过期）；全部空窗 → EMPTY（真的没有，不是失败）。
 *
 * @param {string} path 端点路径
 * @param {object} options 取数选项（mode/industry/config/fetchImpl）
 * @param {{toDomain: Function, merge: Function, isEmptyRaw: Function}} hooks
 */
function fetchAggregated(path, options, hooks) {
    const base = { eventFamily: familyParam(options.mode), industry: industryQuery(options.industry) }
    // 票 67：只有实测收片区的端点才带 district（见上方说明）；多窗路径的每个窗都带上。
    if (hooks.acceptsDistrict === true) base.district = districtQuery(options.scope)
    const range = rangeParams(options)
    const windows = historyWindows(range.startTime, range.endTime)
    if (windows.length <= 1) {
        return fetchSection(path, {
            params: { ...base, ...range },
            toData: hooks.toDomain,
            isEmpty: isEmptyBy(hooks.isEmptyRaw),
            freshnessOf,
            config: options.config,
            fetchImpl: options.fetchImpl,
        })
    }
    // 多窗：`toData` 走恒等（保留原始载荷给合并器），EMPTY 判定推迟到合并后统一做。
    return Promise.all(windows.map((window) => fetchSection(path, {
        params: { ...base, ...rangeParams({ ...options, ...window }) },
        toData: (payload) => payload,
        isEmpty: () => false,
        freshnessOf,
        config: options.config,
        fetchImpl: options.fetchImpl,
    }))).then((results) => {
        const failed = results.find((result) => ![SECTION_STATE.SUCCESS, SECTION_STATE.STALE, SECTION_STATE.EMPTY].includes(result.state))
        if (failed) return failed
        const populated = results.filter((result) => result.data)
        if (!populated.length) {
            return section(SECTION_STATE.EMPTY, { mode: 'multi-window', reason: REQUEST_REASON.UNAVAILABLE })
        }
        const merged = hooks.merge(populated.map((result) => result.data), { startTime: range.startTime, endTime: range.endTime })
        const retained = results.some((result) => result.state === SECTION_STATE.STALE)
        if (hooks.isEmptyRaw(merged)) {
            return section(SECTION_STATE.EMPTY, { mode: 'multi-window', retained })
        }
        return section(retained ? SECTION_STATE.STALE : SECTION_STATE.SUCCESS, {
            mode: 'multi-window',
            retained,
            data: hooks.toDomain(merged),
            missing: populated.flatMap((result) => (result.data && result.data.missing) || []),
        })
    })
}

/** 防御性计数（合并求和用；非数字按 0，不让一个脏字段拖垮整窗合并）。 */
function countOf(value) {
    const n = Number(value)
    return Number.isFinite(n) ? n : 0
}

/**
 * 合并多个 handling-efficiency 载荷（票 75）。
 *
 * 逐字段口径（全部**可从各窗独立验证**，合并不发明新数）：
 *   · `durationTrend`：按时序拼接（窗口相接不重叠；仍按 `timeBucket` 去重防边界重复）；
 *   · `events`：各窗首页拼接（等级分布的"仅统计已返回页"标记由域层继续如实算）；
 *   · `summary` 各计数：求和；`handlingEfficiency` 用**合并后状态计数重算**
 *     （分子=已结案(5)，分母=可计入(0–6)——与后端 `stateCounts` 同一算法，不抄单窗百分比）；
 *   · `averageDuration`：按 `sampleCount` 加权平均（无样本如实 EMPTY，不画 0 冒充）；
 *   · `workOrderStateCounts`：按 `stateCode` 求和（字典名取首见窗）。
 *
 * 导出说明：闸门（t75）直接消费它断言合并口径 —— 合并规则只有这一份实现，
 * 闸门不复刻第二份（复刻会漂移：服务改了、闸门还在验旧规则）。
 */
export function mergeEfficiencyPayloads(payloads, fullRange) {
    const list = payloads.filter(Boolean)
    const first = list[0] || {}
    let durationTrend = []
    const seenBuckets = new Set()
    let events = []
    let totalEvents = 0
    let linked = 0
    let missing = 0
    let handled = 0
    let inProgress = 0
    let cancelled = 0
    let weightedDuration = 0
    let durationSamples = 0
    const byState = new Map()
    for (const payload of list) {
        const summary = payload.summary || {}
        totalEvents += countOf(summary.totalEvents)
        linked += countOf(summary.linkedWorkOrderCount)
        missing += countOf(summary.missingWorkOrderCount)
        handled += countOf(summary.handledCount)
        inProgress += countOf(summary.inProgressCount)
        cancelled += countOf(summary.cancelledCount)
        const duration = summary.averageDuration || {}
        const samples = countOf(duration.sampleCount)
        if (samples > 0 && Number.isFinite(Number(duration.value))) {
            weightedDuration += Number(duration.value) * samples
            durationSamples += samples
        }
        for (const row of Array.isArray(payload.workOrderStateCounts) ? payload.workOrderStateCounts : []) {
            const previous = byState.get(row.stateCode)
            byState.set(row.stateCode, {
                stateCode: row.stateCode,
                stateName: (previous && previous.stateName) || row.stateName,
                count: ((previous && previous.count) || 0) + countOf(row.count),
            })
        }
        for (const row of Array.isArray(payload.durationTrend) ? payload.durationTrend : []) {
            if (seenBuckets.has(row.timeBucket)) continue
            seenBuckets.add(row.timeBucket)
            durationTrend.push(row)
        }
        if (Array.isArray(payload.events)) events = events.concat(payload.events)
    }
    durationTrend.sort((left, right) => String(left.timeBucket).localeCompare(String(right.timeBucket)))
    const stateCounts = [...byState.values()].sort((left, right) => left.stateCode - right.stateCode)
    const basis = (first.summary && first.summary.handlingEfficiency && first.summary.handlingEfficiency.basis)
        || 'CLOSED_WORK_ORDERS_OVER_ELIGIBLE_WORK_ORDERS'
    const numerator = stateCounts.filter((row) => row.stateCode === 5).reduce((sum, row) => sum + row.count, 0)
    const denominator = stateCounts.filter((row) => row.stateCode >= 0 && row.stateCode <= 6).reduce((sum, row) => sum + row.count, 0)
    const handlingEfficiency = denominator > 0
        ? { value: (numerator / denominator).toFixed(4), numerator, denominator, state: 'AVAILABLE', reason: 'READY', basis }
        : { value: '0.0000', numerator: 0, denominator: 0, state: 'EMPTY', reason: 'NO_ELIGIBLE_WORK_ORDERS', basis }
    const averageDuration = durationSamples > 0
        ? { value: (weightedDuration / durationSamples).toFixed(2), unit: 'HOURS', sampleCount: durationSamples, state: 'AVAILABLE', reason: 'READY' }
        : { value: '0.00', unit: 'HOURS', sampleCount: 0, state: 'EMPTY', reason: 'NO_CLOSED_WORK_ORDERS' }

    return {
        ...first,
        range: { ...(first.range || {}), type: 'TREND_WINDOW', startTime: fullRange.startTime, endTime: fullRange.endTime },
        durationTrend,
        events,
        workOrderStateCounts: stateCounts,
        summary: {
            ...(first.summary || {}),
            totalEvents,
            linkedWorkOrderCount: linked,
            missingWorkOrderCount: missing,
            handledCount: handled,
            inProgressCount: inProgress,
            cancelledCount: cancelled,
            handlingEfficiency,
            averageDuration,
        },
    }
}

/**
 * 合并多个 multidimensional-analysis 载荷（票 75）。
 *
 * `dimensions` 按 `dimensionCode` 合并（次序取首见窗——各窗维度集相同，只是数不同）；
 * buckets 按 `bucketCode` 求和，`percentage` **重算**而不是把各窗百分比相加
 * （50% + 25% = 75% 是错的，分母变了）。
 *
 * 导出说明：同 `mergeEfficiencyPayloads` —— 合并规则单一实现，闸门直接消费。
 */
export function mergeAnalysisPayloads(payloads, fullRange) {
    const list = payloads.filter(Boolean)
    const first = list[0] || {}
    const dimensions = new Map()
    let totalCount = 0
    for (const payload of list) {
        totalCount += countOf(payload.totalCount)
        for (const dimension of Array.isArray(payload.dimensions) ? payload.dimensions : []) {
            const entry = dimensions.get(dimension.dimensionCode) || {
                dimensionCode: dimension.dimensionCode,
                dimensionLabel: dimension.dimensionLabel,
                totalCount: 0,
                buckets: new Map(),
                bucketOrder: [],
            }
            entry.totalCount += countOf(dimension.totalCount)
            for (const bucket of Array.isArray(dimension.buckets) ? dimension.buckets : []) {
                const previous = entry.buckets.get(bucket.bucketCode)
                if (previous) {
                    previous.count += countOf(bucket.count)
                } else {
                    const copy = { ...bucket, count: countOf(bucket.count) }
                    entry.buckets.set(bucket.bucketCode, copy)
                    entry.bucketOrder.push(copy)
                }
            }
            dimensions.set(dimension.dimensionCode, entry)
        }
    }
    return {
        ...first,
        range: { ...(first.range || {}), type: 'ANALYSIS_WINDOW', startTime: fullRange.startTime, endTime: fullRange.endTime },
        totalCount,
        dimensions: [...dimensions.values()].map((entry) => ({
            dimensionCode: entry.dimensionCode,
            dimensionLabel: entry.dimensionLabel,
            totalCount: entry.totalCount,
            buckets: entry.bucketOrder.map((bucket) => ({
                ...bucket,
                percentage: entry.totalCount > 0 ? ((bucket.count / entry.totalCount) * 100).toFixed(2) : '0.00',
            })),
        })),
    }
}

const EFFICIENCY_EMPTY = (payload) => {
    const family = payload && payload.familyMetrics
    return !payload || (!(payload.summary && payload.summary.handlingEfficiency) && !payload.handlingEfficiency && !(family && family.handlingEfficiency) && payload.averageResponseSeconds === undefined && payload.averageResponseDuration === undefined && !(payload.averageDuration && typeof payload.averageDuration === 'object'))
}

export function fetchHandlingEfficiency(options = {}) {
    return fetchAggregated(WARNING_RESPONSE_PATHS.efficiency, options, {
        toDomain: toHandlingEfficiency,
        merge: mergeEfficiencyPayloads,
        isEmptyRaw: EFFICIENCY_EMPTY,
    })
}

export function fetchEventAnalysis(options = {}) {
    return fetchAggregated(WARNING_RESPONSE_PATHS.analysis, options, {
        toDomain: toEventAnalysis,
        merge: mergeAnalysisPayloads,
        // 票 67：事件族里**唯一**收片区入参的端点（实测见 `rangeParams` 上方）。
        acceptsDistrict: true,
        isEmptyRaw: (payload) => {
            const dimensions = (payload && payload.dimensions) || payload || {}
            if (Array.isArray(dimensions)) return !dimensions.some((row) => Array.isArray(row.buckets) && row.buckets.length)
            return !['types', 'byType', 'levels', 'byLevel', 'industries', 'byIndustry', 'regions', 'byRegion'].some((key) => Array.isArray(dimensions[key]) && dimensions[key].length)
        },
    })
}