const dayjs = require('dayjs');
const cloudDb = require('../config/cloudDatabase');

const DELIVERY_DURATION_EXCLUDED_WAREHOUSES = [
  '常州简尚家居有限公司',
  '三方-京东京造',
];

const DELIVERY_DURATION_EXCLUDED_LOGISTICS_KEYWORDS = [
  '中铁',
  '自提',
  '物流',
  '专线',
  '线下快递',
  '武进安能',
  '京喜',
  '京东自营',
  '京造',
];

const UNKNOWN_WAREHOUSE = '未知仓库';
const UNKNOWN_COURIER = '未知物流公司';
const UNKNOWN_PROVINCE = '未知省份';
const REQUEST_TIMEOUT = 180000;

const DELIVERY_DETAIL_COLUMNS = [
  { key: 'innerOrderId', title: '内部订单号' },
  { key: 'onlineOrderNo', title: '线上订单号' },
  { key: 'waybillNo', title: '物流单号' },
  { key: 'courierName', title: '物流公司' },
  { key: 'platformName', title: '平台' },
  { key: 'shopName', title: '店铺' },
  { key: 'warehouseName', title: '发货仓' },
  { key: 'receiverAddress', title: '收货省市区' },
  { key: 'payTime', title: '支付时间' },
  { key: 'sendTime', title: '发货时间' },
  { key: 'fetchTime', title: '揽收时间' },
  { key: 'signTime', title: '签收时间' },
  { key: 'payToSignHours', title: '付款至签收时长(h)' },
  { key: 'sendToSignHours', title: '发货至签收时长(h)' },
];

function q(value) {
  return `N'${String(value).replace(/'/g, "''")}'`;
}

function parseListParam(value) {
  if (Array.isArray(value)) {
    return [...new Set(value.flatMap((item) => parseListParam(item)))];
  }

  return [...new Set(String(value || '')
    .split(',')
    .map((item) => item.trim())
    .filter(Boolean))];
}

function toNumber(value, fallback = 0) {
  const parsed = Number(value);
  return Number.isFinite(parsed) ? parsed : fallback;
}

function round2(value) {
  const parsed = toNumber(value);
  return Number(parsed.toFixed(2));
}

function normalizeDateRange({ startDate, endDate } = {}) {
  const startCandidate = startDate && dayjs(startDate).isValid()
    ? dayjs(startDate)
    : dayjs().startOf('month');
  const endCandidate = endDate && dayjs(endDate).isValid()
    ? dayjs(endDate)
    : dayjs();

  const start = startCandidate.isAfter(endCandidate, 'day') ? endCandidate : startCandidate;
  const end = endCandidate.isBefore(startCandidate, 'day') ? startCandidate : endCandidate;

  return {
    startDate: start.format('YYYY-MM-DD'),
    endDate: end.format('YYYY-MM-DD'),
    startDateTime: `${start.format('YYYY-MM-DD')} 00:00:00`,
    endDateExclusive: `${end.add(1, 'day').format('YYYY-MM-DD')} 00:00:00`,
  };
}

function sortTextValues(values) {
  return values
    .filter(Boolean)
    .sort((a, b) => String(a).localeCompare(String(b), 'zh-Hans-CN'));
}

const excludedWarehousesSql = DELIVERY_DURATION_EXCLUDED_WAREHOUSES.map(q).join(', ');
const excludedLogisticsSql = DELIVERY_DURATION_EXCLUDED_LOGISTICS_KEYWORDS
  .map((keyword) => `ISNULL(logistic_company_name, N'') NOT LIKE ${q(`%${keyword}%`)}`)
  .join('\n      AND ');

const provinceExpr = `
CASE
  WHEN receiver_address IS NULL OR LTRIM(RTRIM(receiver_address)) = N'' THEN N'${UNKNOWN_PROVINCE}'
  WHEN CHARINDEX(N'-', receiver_address) > 0 THEN LEFT(receiver_address, CHARINDEX(N'-', receiver_address) - 1)
  WHEN CHARINDEX(N'自治区', receiver_address) > 0 THEN LEFT(receiver_address, CHARINDEX(N'自治区', receiver_address) + 2)
  WHEN CHARINDEX(N'省', receiver_address) > 0 THEN LEFT(receiver_address, CHARINDEX(N'省', receiver_address))
  WHEN CHARINDEX(N'市', receiver_address) > 0 THEN LEFT(receiver_address, CHARINDEX(N'市', receiver_address))
  ELSE receiver_address
END`;

const deliveryBaseWhereSql = `
  sign_time >= @startDateTime
  AND sign_time < @endDateExclusive
  AND pay_time IS NOT NULL
  AND send_time IS NOT NULL
  AND sign_time IS NOT NULL
  AND sign_time >= pay_time
  AND sign_time >= send_time
  AND ISNULL(warehouse_name, N'') NOT IN (${excludedWarehousesSql})
  AND (
    logistic_company_name IS NULL
    OR (
      ${excludedLogisticsSql}
    )
  )`;

const DELIVERY_AGGREGATE_SQL = `
SET NOCOUNT ON;

WITH delivery_base AS (
  SELECT
    CONVERT(varchar(10), sign_time, 120) AS stat_date,
    COALESCE(NULLIF(LTRIM(RTRIM(warehouse_name)), N''), N'${UNKNOWN_WAREHOUSE}') AS warehouse_name,
    COALESCE(NULLIF(LTRIM(RTRIM(logistic_company_name)), N''), N'${UNKNOWN_COURIER}') AS courier_name,
    COALESCE(NULLIF(LTRIM(RTRIM(${provinceExpr})), N''), N'${UNKNOWN_PROVINCE}') AS province,
    CAST(DATEDIFF(SECOND, pay_time, sign_time) AS DECIMAL(20, 2)) / 3600.0 AS pay_to_sign_hours,
    CAST(DATEDIFF(SECOND, send_time, sign_time) AS DECIMAL(20, 2)) / 3600.0 AS send_to_sign_hours,
    CASE WHEN DATEDIFF(SECOND, pay_time, sign_time) <= 48 * 3600 THEN 1 ELSE 0 END AS timely_48
  FROM dbo.jst_order_express_details
  WHERE ${deliveryBaseWhereSql}
)
SELECT
  stat_date AS statDate,
  warehouse_name AS warehouseName,
  courier_name AS courierName,
  province,
  COUNT_BIG(*) AS orderCount,
  CAST(ROUND(SUM(pay_to_sign_hours), 2) AS DECIMAL(20, 2)) AS payTotalHours,
  CAST(ROUND(SUM(send_to_sign_hours), 2) AS DECIMAL(20, 2)) AS sendTotalHours,
  SUM(timely_48) AS timely48Count
FROM delivery_base
GROUP BY stat_date, warehouse_name, courier_name, province
ORDER BY stat_date, warehouse_name, province, courier_name;
`;

function normalizeAggregateRow(row) {
  const orderCount = toNumber(row.orderCount);
  const payTotalHours = toNumber(row.payTotalHours);
  const sendTotalHours = toNumber(row.sendTotalHours);
  const timely48Count = toNumber(row.timely48Count);

  return {
    statDate: row.statDate || '',
    warehouseName: row.warehouseName || UNKNOWN_WAREHOUSE,
    courierName: row.courierName || UNKNOWN_COURIER,
    province: row.province || UNKNOWN_PROVINCE,
    orderCount,
    payTotalHours,
    sendTotalHours,
    timely48Count,
  };
}

function createBucket() {
  return {
    orderCount: 0,
    payTotalHours: 0,
    sendTotalHours: 0,
    timely48Count: 0,
  };
}

function addToBucket(bucket, row) {
  bucket.orderCount += toNumber(row.orderCount);
  bucket.payTotalHours += toNumber(row.payTotalHours);
  bucket.sendTotalHours += toNumber(row.sendTotalHours);
  bucket.timely48Count += toNumber(row.timely48Count);
}

function finalizeBucket(bucket) {
  const orderCount = toNumber(bucket.orderCount);
  const timely48Count = toNumber(bucket.timely48Count);

  return {
    orderCount,
    payTotalHours: round2(bucket.payTotalHours),
    sendTotalHours: round2(bucket.sendTotalHours),
    avgPayToSignHours: orderCount > 0 ? round2(bucket.payTotalHours / orderCount) : null,
    avgSendToSignHours: orderCount > 0 ? round2(bucket.sendTotalHours / orderCount) : null,
    timely48Count,
    timely48Rate: orderCount > 0 ? round2((timely48Count / orderCount) * 100) : null,
  };
}

function buildFilterOptions(rows) {
  return {
    warehouses: sortTextValues([...new Set(rows.map((row) => row.warehouseName))]),
    couriers: sortTextValues([...new Set(rows.map((row) => row.courierName))]),
    provinces: sortTextValues([...new Set(rows.map((row) => row.province))]),
  };
}

function filterRows(rows, filters) {
  const warehouseSet = new Set(parseListParam(filters.warehouses));
  const courierSet = new Set(parseListParam(filters.couriers));
  const provinceSet = new Set(parseListParam(filters.provinces));

  return rows.filter((row) => (
    (warehouseSet.size === 0 || warehouseSet.has(row.warehouseName)) &&
    (courierSet.size === 0 || courierSet.has(row.courierName)) &&
    (provinceSet.size === 0 || provinceSet.has(row.province))
  ));
}

function buildSummary(rows) {
  const bucket = createBucket();
  rows.forEach((row) => addToBucket(bucket, row));
  const summary = finalizeBucket(bucket);

  return {
    orderCount: summary.orderCount,
    avgPayToSignHours: summary.avgPayToSignHours,
    avgSendToSignHours: summary.avgSendToSignHours,
    timely48Count: summary.timely48Count,
    timely48Rate: summary.timely48Rate,
    timeout48Count: Math.max(0, summary.orderCount - summary.timely48Count),
  };
}

function buildCourierSummaries(rows) {
  const grouped = new Map();

  rows.forEach((row) => {
    if (!grouped.has(row.courierName)) grouped.set(row.courierName, createBucket());
    addToBucket(grouped.get(row.courierName), row);
  });

  return Array.from(grouped.entries())
    .map(([name, bucket]) => ({
      name,
      ...finalizeBucket(bucket),
    }))
    .sort((a, b) => (
      toNumber(a.avgPayToSignHours, Number.MAX_SAFE_INTEGER) - toNumber(b.avgPayToSignHours, Number.MAX_SAFE_INTEGER) ||
      String(a.name).localeCompare(String(b.name), 'zh-Hans-CN')
    ));
}

function buildTotalRow(rows, dimensions, key) {
  const totalBucket = createBucket();
  const courierMap = {};

  rows.forEach((row) => {
    addToBucket(totalBucket, row);
    if (!courierMap[row.courierName]) courierMap[row.courierName] = createBucket();
    addToBucket(courierMap[row.courierName], row);
  });

  const totalRow = {
    key,
    statDate: '总计',
    warehouseName: dimensions.includes('warehouseName') ? '总计' : undefined,
    province: dimensions.includes('province') ? '总计' : undefined,
    total: finalizeBucket(totalBucket),
    courierMap: {},
  };

  Object.entries(courierMap).forEach(([courierName, bucket]) => {
    totalRow.courierMap[courierName] = finalizeBucket(bucket);
  });

  return totalRow;
}

function buildPivotRows(rows, dimensions, totalKey) {
  const grouped = new Map();

  rows.forEach((row) => {
    const keyParts = dimensions.map((dimension) => row[dimension] || '');
    const key = keyParts.join('\u0001');
    if (!grouped.has(key)) {
      const next = {
        key: `${totalKey}:${keyParts.join('|')}`,
        total: createBucket(),
        courierMap: {},
      };
      dimensions.forEach((dimension) => {
        next[dimension] = row[dimension] || '';
      });
      grouped.set(key, next);
    }

    const target = grouped.get(key);
    addToBucket(target.total, row);

    if (!target.courierMap[row.courierName]) {
      target.courierMap[row.courierName] = createBucket();
    }
    addToBucket(target.courierMap[row.courierName], row);
  });

  const dataRows = Array.from(grouped.values())
    .map((row) => {
      const courierMap = {};
      Object.entries(row.courierMap).forEach(([courierName, bucket]) => {
        courierMap[courierName] = finalizeBucket(bucket);
      });

      return {
        ...row,
        total: finalizeBucket(row.total),
        courierMap,
      };
    })
    .sort((a, b) => (
      String(a.statDate || '').localeCompare(String(b.statDate || '')) ||
      String(a.warehouseName || '').localeCompare(String(b.warehouseName || ''), 'zh-Hans-CN') ||
      String(a.province || '').localeCompare(String(b.province || ''), 'zh-Hans-CN')
    ));

  if (rows.length === 0) return [];

  return [
    buildTotalRow(rows, dimensions, `${totalKey}:total`),
    ...dataRows,
  ];
}

function buildDeliveryBoard(rows) {
  return {
    summary: buildSummary(rows),
    couriers: buildCourierSummaries(rows),
    courierDateRows: buildPivotRows(rows, ['statDate'], 'courier-date'),
    courierProvinceRows: buildPivotRows(rows, ['statDate', 'province'], 'courier-province'),
    warehouseCourierProvinceRows: buildPivotRows(rows, ['statDate', 'warehouseName', 'province'], 'warehouse-courier-province'),
  };
}

async function queryLogisticsDeliveryDurationBoard(params = {}) {
  const range = normalizeDateRange(params);
  const aggregateRows = await cloudDb.query(
    DELIVERY_AGGREGATE_SQL,
    {
      startDateTime: range.startDateTime,
      endDateExclusive: range.endDateExclusive,
    },
    { requestTimeout: REQUEST_TIMEOUT }
  );
  const normalizedRows = aggregateRows.map(normalizeAggregateRow);
  const filteredRows = filterRows(normalizedRows, params);
  const board = buildDeliveryBoard(filteredRows);

  return {
    ...board,
    filters: buildFilterOptions(normalizedRows),
    detailColumns: DELIVERY_DETAIL_COLUMNS,
    meta: {
      startDate: range.startDate,
      endDate: range.endDate,
      statisticDateField: 'sign_time',
      sourceTable: 'dbo.jst_order_express_details',
      excludedWarehouses: DELIVERY_DURATION_EXCLUDED_WAREHOUSES,
      excludedLogisticsKeywords: DELIVERY_DURATION_EXCLUDED_LOGISTICS_KEYWORDS,
      calculatedAt: dayjs().format('YYYY-MM-DD HH:mm:ss'),
    },
  };
}

function appendInFilter(whereParts, params, column, values, prefix) {
  const list = parseListParam(values);
  if (list.length === 0) return;

  const placeholders = list.map((value, index) => {
    const key = `${prefix}${index}`;
    params[key] = value;
    return `@${key}`;
  });

  whereParts.push(`${column} IN (${placeholders.join(', ')})`);
}

function buildDetailSql(whereClause) {
  return `
SET NOCOUNT ON;

WITH delivery_base AS (
  SELECT
    CAST(e.id AS nvarchar(64)) AS express_detail_id,
    NULLIF(LTRIM(RTRIM(e.so_id)), N'') AS online_order_no,
    NULLIF(LTRIM(RTRIM(e.logistic_id)), N'') AS waybill_no,
    COALESCE(NULLIF(LTRIM(RTRIM(e.logistic_company_name)), N''), N'${UNKNOWN_COURIER}') AS courier_name,
    NULLIF(LTRIM(RTRIM(e.platform_name)), N'') AS platform_name,
    NULLIF(LTRIM(RTRIM(e.shop_name)), N'') AS shop_name,
    COALESCE(NULLIF(LTRIM(RTRIM(e.warehouse_name)), N''), N'${UNKNOWN_WAREHOUSE}') AS warehouse_name,
    NULLIF(LTRIM(RTRIM(e.receiver_address)), N'') AS receiver_address,
    COALESCE(NULLIF(LTRIM(RTRIM(${provinceExpr.replace(/receiver_address/g, 'e.receiver_address')})), N''), N'${UNKNOWN_PROVINCE}') AS province,
    e.pay_time,
    e.send_time,
    e.fetch_time,
    e.sign_time,
    CAST(DATEDIFF(SECOND, e.pay_time, e.sign_time) AS DECIMAL(20, 2)) / 3600.0 AS pay_to_sign_hours,
    CAST(DATEDIFF(SECOND, e.send_time, e.sign_time) AS DECIMAL(20, 2)) / 3600.0 AS send_to_sign_hours,
    CASE WHEN DATEDIFF(SECOND, e.pay_time, e.sign_time) <= 48 * 3600 THEN 1 ELSE 0 END AS timely_48
  FROM dbo.jst_order_express_details e
  WHERE
    e.sign_time >= @startDateTime
    AND e.sign_time < @endDateExclusive
    AND e.pay_time IS NOT NULL
    AND e.send_time IS NOT NULL
    AND e.sign_time IS NOT NULL
    AND e.sign_time >= e.pay_time
    AND e.sign_time >= e.send_time
    AND ISNULL(e.warehouse_name, N'') NOT IN (${excludedWarehousesSql})
    AND (
      e.logistic_company_name IS NULL
      OR (
        ${DELIVERY_DURATION_EXCLUDED_LOGISTICS_KEYWORDS
          .map((keyword) => `ISNULL(e.logistic_company_name, N'') NOT LIKE ${q(`%${keyword}%`)}`)
          .join('\n        AND ')}
      )
    )
),
numbered AS (
  SELECT
    ROW_NUMBER() OVER (ORDER BY sign_time ASC, express_detail_id ASC) AS __rowNumber,
    COUNT_BIG(*) OVER() AS __total,
    express_detail_id,
    online_order_no AS onlineOrderNo,
    waybill_no AS waybillNo,
    courier_name AS courierName,
    platform_name AS platformName,
    shop_name AS shopName,
    warehouse_name AS warehouseName,
    province,
    receiver_address AS receiverAddress,
    CONVERT(varchar(19), pay_time, 120) AS payTime,
    CONVERT(varchar(19), send_time, 120) AS sendTime,
    CONVERT(varchar(19), fetch_time, 120) AS fetchTime,
    CONVERT(varchar(19), sign_time, 120) AS signTime,
    CAST(ROUND(pay_to_sign_hours, 2) AS DECIMAL(10, 2)) AS payToSignHours,
    CAST(ROUND(send_to_sign_hours, 2) AS DECIMAL(10, 2)) AS sendToSignHours,
    timely_48 AS timely48
  FROM delivery_base
  WHERE ${whereClause}
)
SELECT
  page_data.__rowNumber,
  page_data.__total,
  COALESCE(NULLIF(LTRIM(RTRIM(afs.inner_order_id)), N''), page_data.express_detail_id) AS innerOrderId,
  page_data.onlineOrderNo,
  page_data.waybillNo,
  page_data.courierName,
  page_data.platformName,
  page_data.shopName,
  page_data.warehouseName,
  page_data.province,
  page_data.receiverAddress,
  page_data.payTime,
  page_data.sendTime,
  page_data.fetchTime,
  page_data.signTime,
  page_data.payToSignHours,
  page_data.sendToSignHours,
  page_data.timely48
FROM numbered page_data
OUTER APPLY (
  SELECT TOP 1
    NULLIF(LTRIM(RTRIM(a.undefined1)), N'') AS inner_order_id
  FROM dbo.jst_goods_profit_kpi_items_afs a
  WHERE NULLIF(LTRIM(RTRIM(a.undefined2)), N'') = page_data.onlineOrderNo
  ORDER BY TRY_CONVERT(datetime, REPLACE(a.undefined5, '/', '-')) DESC
) afs
WHERE page_data.__rowNumber BETWEEN @startRow AND @endRow
ORDER BY __rowNumber;
`;
}

async function queryLogisticsDeliveryDurationDetails(params = {}) {
  const range = normalizeDateRange(params);
  const page = Math.max(1, parseInt(params.page, 10) || 1);
  const pageSize = Math.min(5000, Math.max(1, parseInt(params.pageSize, 10) || 20));
  const startRow = ((page - 1) * pageSize) + 1;
  const endRow = page * pageSize;
  const queryParams = {
    startDateTime: range.startDateTime,
    endDateExclusive: range.endDateExclusive,
    startRow,
    endRow,
  };
  const whereParts = ['1 = 1'];

  appendInFilter(whereParts, queryParams, 'warehouse_name', params.warehouses, 'warehouse');
  appendInFilter(whereParts, queryParams, 'courier_name', params.couriers, 'courier');
  appendInFilter(whereParts, queryParams, 'province', params.provinces, 'province');

  const rows = await cloudDb.query(
    buildDetailSql(whereParts.join(' AND ')),
    queryParams,
    { requestTimeout: REQUEST_TIMEOUT }
  );
  const total = rows.length > 0 ? toNumber(rows[0].__total) : 0;

  return {
    columns: DELIVERY_DETAIL_COLUMNS,
    rows: rows.map((row) => ({
      innerOrderId: row.innerOrderId || '',
      onlineOrderNo: row.onlineOrderNo || '',
      waybillNo: row.waybillNo || '',
      courierName: row.courierName || UNKNOWN_COURIER,
      platformName: row.platformName || '',
      shopName: row.shopName || '',
      warehouseName: row.warehouseName || UNKNOWN_WAREHOUSE,
      province: row.province || UNKNOWN_PROVINCE,
      receiverAddress: row.receiverAddress || '',
      payTime: row.payTime || '',
      sendTime: row.sendTime || '',
      fetchTime: row.fetchTime || '',
      signTime: row.signTime || '',
      payToSignHours: row.payToSignHours === null || row.payToSignHours === undefined ? '' : round2(row.payToSignHours),
      sendToSignHours: row.sendToSignHours === null || row.sendToSignHours === undefined ? '' : round2(row.sendToSignHours),
      timely48: toNumber(row.timely48) === 1 ? '是' : '否',
    })),
    total,
    page,
    pageSize,
    meta: {
      startDate: range.startDate,
      endDate: range.endDate,
      statisticDateField: 'sign_time',
      sourceTable: 'dbo.jst_order_express_details',
    },
  };
}

module.exports = {
  queryLogisticsDeliveryDurationBoard,
  queryLogisticsDeliveryDurationDetails,
  DELIVERY_DETAIL_COLUMNS,
};