import { Hono } from 'hono';
import pool from '../../db.js';
import mileagePool from '../../mileage-db.js';
import { fetchVehicleInfoMap } from '../mileage/vehicle-info.js';
import { mapRegion } from '../vehicles.js';
import { filterByPermission, maskCustomerNames } from '../../auth/permissions.js';
import { classifyVehicle, generateSuggestions } from './algorithm.js';
import { fetchActiveNotificationMap, fetchRecentInterventionCount } from './notify.js';
import type { EnrichedVehicle, InventoryVehicle, SchedulingResponse, SchedulingSummary } from './types.js';
import type { AuthUser } from '../../auth/types.js';

// ---------------------------------------------------------------------------
// Helper: vehicle type classification
// ---------------------------------------------------------------------------

/**
 * Infer vehicle type from target name when truck table has no match.
 * e.g. "交投190辆4.5T冷链车" → "4.5T冷链", "羚牛100辆18T" → "18T"
 */
function inferTypeFromTargetName(targetName: string): string {
  const t = targetName || '';
  if (t.includes('冷链')) return '4.5T冷链';
  if (t.includes('普货') || (t.includes('4.5') && !t.includes('冷链'))) return '4.5T普货';
  if (t.includes('18T') || t.includes('18t')) return '18T';
  if (t.includes('49') || t.includes('牵引')) return '49T';
  if (t.includes('挂车')) return '挂车';
  return '其他';
}

/**
 * Classify vehicle type from dic_type.dic_name (e.g. "4.5吨冷链车", "4.5吨货车", "18吨双飞翼货车").
 * The typeName is the full label from the dictionary, modelRaw is the numeric dic_code.
 */
function classifyVehicleType(typeName: string, _modelRaw: string): string {
  const t = (typeName || '').trim();
  if (t.includes('4.5') && t.includes('冷链')) return '4.5T冷链';
  if (t.includes('4.5')) return '4.5T普货';
  if (t.includes('18')) return '18T';
  if (t.includes('49') || t.includes('牵引')) return '49T';
  if (t.includes('挂车')) return '挂车';
  return t || '其他';
}

// ---------------------------------------------------------------------------
// Route
// ---------------------------------------------------------------------------

const app = new Hono();

app.get('/', async (c) => {
  try {
    const targetIdParam = c.req.query('targetId');
    const filterTargetId = targetIdParam ? Number(targetIdParam) : null;

    // ---- Query 1: Assessment targets ----
    const [targets] = await pool.execute(
      'SELECT id, target_name, annual_mileage_per_vehicle FROM tab_mileage_assessment_target WHERE is_deleted = 0 ORDER BY id',
    ) as [any[], unknown];

    const targetMap = new Map<number, { targetName: string; annualMileage: number }>();
    for (const t of targets) {
      targetMap.set(t.id, {
        targetName: t.target_name,
        annualMileage: Number(t.annual_mileage_per_vehicle) || 0,
      });
    }

    // ---- Query 2: Assessment vehicles ----
    const [assessmentRows] = await pool.execute(`
      SELECT target_id, plate_number, today_mileage, vehicle_total_mileage,
             current_mileage, current_year_mileage, current_year_mileage_task,
             completion_rate, is_qualified, current_year_is_qualified,
             daily_required_mileage, current_year_assessment_end_date
      FROM tab_mileage_assessment_vehicle WHERE is_deleted = 0
    `) as [any[], unknown];

    // ---- Query 3: Vehicle info (customer, dept, manager) ----
    const vehicleInfoMap = await fetchVehicleInfoMap();

    // ---- Query 4: Vehicle types from tab_truck ----
    // Include soft-deleted trucks: many assessment vehicles have is_deleted=1 in tab_truck
    // but are still active in the assessment. We need their type info.
    const [truckTypeRows] = await pool.execute(`
      SELECT truck.plate_number, dic_type.dic_name AS type_name, truck.model AS model_raw
      FROM tab_truck truck
      LEFT JOIN tab_dic dic_type ON dic_type.parent_code = 'dic_truck_type'
        AND dic_type.dic_code = truck.model AND dic_type.is_deleted = 0
      WHERE truck.is_operation = 1
    `) as [any[], unknown];

    const truckTypeMap = new Map<string, { typeName: string; modelRaw: string }>();
    for (const row of truckTypeRows) {
      truckTypeMap.set(row.plate_number, {
        typeName: row.type_name || '',
        modelRaw: row.model_raw || '',
      });
    }

    // ---- Query 5: Real-time location ----
    const [locationRows] = await pool.execute(`
      SELECT plate_number, province, city
      FROM tab_truck_remote_sync_realtime_info
      WHERE is_deleted = 0 AND plate_number IS NOT NULL
    `) as [any[], unknown];

    const locationMap = new Map<string, { province: string; city: string }>();
    for (const row of locationRows) {
      locationMap.set(row.plate_number, {
        province: row.province || '',
        city: row.city || '',
      });
    }

    // ---- Collect all plates for Query 6 ----
    const allPlates = assessmentRows.map((r: any) => r.plate_number as string);

    // ---- Query 6: Customer daily avg (from mileage DB) — 30d baseline + 7d recent ----
    const customerAvgDailyMap = new Map<string, number>();
    const customerAvgDaily7dMap = new Map<string, number>();
    if (allPlates.length > 0) {
      const placeholders = allPlates.map(() => '?').join(',');
      // Single query returning both windows per plate.
      const [dailyRows] = await mileagePool.execute(
        `SELECT plate,
                AVG(CASE WHEN stat_date >= DATE_SUB(CURDATE(), INTERVAL 30 DAY) THEN daily_km END) AS avg_30d,
                AVG(CASE WHEN stat_date >= DATE_SUB(CURDATE(), INTERVAL 7 DAY)  THEN daily_km END) AS avg_7d
         FROM v_vehicle_daily_stats
         WHERE stat_date >= DATE_SUB(CURDATE(), INTERVAL 30 DAY)
           AND stat_date < CURDATE()
           AND plate IN (${placeholders})
         GROUP BY plate`,
        allPlates,
      ) as [any[], unknown];

      const plateAvg30Map = new Map<string, number>();
      const plateAvg7Map = new Map<string, number>();
      for (const row of dailyRows) {
        if (row.avg_30d !== null) plateAvg30Map.set(row.plate, Number(row.avg_30d));
        if (row.avg_7d !== null) plateAvg7Map.set(row.plate, Number(row.avg_7d));
      }

      const customerPlates30 = new Map<string, number[]>();
      const customerPlates7 = new Map<string, number[]>();
      for (const plate of allPlates) {
        const info = vehicleInfoMap.get(plate);
        const customer = info?.customer || '未知客户';
        if (!customerPlates30.has(customer)) customerPlates30.set(customer, []);
        if (!customerPlates7.has(customer)) customerPlates7.set(customer, []);
        const v30 = plateAvg30Map.get(plate);
        const v7 = plateAvg7Map.get(plate);
        if (v30 !== undefined) customerPlates30.get(customer)!.push(v30);
        if (v7 !== undefined) customerPlates7.get(customer)!.push(v7);
      }
      for (const [customer, avgs] of customerPlates30) {
        if (avgs.length > 0) customerAvgDailyMap.set(customer, avgs.reduce((s, v) => s + v, 0) / avgs.length);
      }
      for (const [customer, avgs] of customerPlates7) {
        if (avgs.length > 0) customerAvgDaily7dMap.set(customer, avgs.reduce((s, v) => s + v, 0) / avgs.length);
      }
    }

    // ---- Query 7: Inventory vehicles (rent_status = 0) ----
    const [inventoryTruckRows] = await pool.execute(`
      SELECT truck.plate_number, dic_type.dic_name AS type_name, truck.model AS model_raw
      FROM tab_truck truck
      LEFT JOIN tab_dic dic_type ON dic_type.parent_code = 'dic_truck_type'
        AND dic_type.dic_code = truck.model AND dic_type.is_deleted = 0
      WHERE truck.is_deleted = 0 AND truck.is_operation = 1
        AND truck.truck_rent_status = 0
    `) as [any[], unknown];

    // ---- Build assessment vehicle lookup for inventory cross-reference ----
    const assessmentByPlate = new Map<string, any>();
    for (const row of assessmentRows) {
      assessmentByPlate.set(row.plate_number, row);
    }

    // ---- Enrich assessment vehicles ----
    const now = new Date();
    const yearEnd = new Date(now.getFullYear(), 11, 31); // Dec 31

    const enrichedVehicles: EnrichedVehicle[] = [];
    for (const row of assessmentRows) {
      const targetId = row.target_id as number;
      if (filterTargetId !== null && targetId !== filterTargetId) continue;

      const target = targetMap.get(targetId);
      if (!target) continue;

      const plate = row.plate_number as string;
      const info = vehicleInfoMap.get(plate);

      // Only include vehicles that are actively rented/operated (租赁 or 自营)
      const rentStatus = info?.rent_status || '';
      if (rentStatus !== '租赁' && rentStatus !== '自营') continue;

      const loc = locationMap.get(plate);
      const truckType = truckTypeMap.get(plate);

      const province = loc?.province || '';
      const city = loc?.city || '';
      const region = mapRegion(province, city);

      // Determine vehicle type: prefer truck table, fallback to target name
      let vehicleType = '其他';
      if (truckType) {
        vehicleType = classifyVehicleType(truckType.typeName, truckType.modelRaw);
      } else {
        // Fallback: infer from target name (e.g. "交投190辆4.5T冷链车" → "4.5T冷链")
        vehicleType = inferTypeFromTargetName(target.targetName);
      }

      const endDate = row.current_year_assessment_end_date
        ? new Date(row.current_year_assessment_end_date)
        : yearEnd;
      const daysLeft = Math.max(1, Math.ceil((endDate.getTime() - now.getTime()) / 86400000));

      const customer = info?.customer || null;
      const customerAvgDaily = customerAvgDailyMap.get(customer || '未知客户') || 0;
      const customerAvgDaily7d = customerAvgDaily7dMap.get(customer || '未知客户') || 0;
      const currentYearMileage = Number(row.current_year_mileage) || 0;
      const yearTarget = Number(row.current_year_mileage_task) || 0;
      const predictedYearEnd = currentYearMileage + customerAvgDaily * daysLeft;

      const currentYearIsQualified = row.current_year_is_qualified === 1;
      const classification = classifyVehicle(currentYearIsQualified, currentYearMileage, yearTarget, predictedYearEnd);

      enrichedVehicles.push({
        plateNumber: plate,
        targetId,
        targetName: target.targetName,
        vehicleType,
        totalMileage: Number(row.vehicle_total_mileage) || 0,
        currentYearMileage,
        completionRate: Number(row.completion_rate) || 0,
        yearTarget,
        isQualified: row.is_qualified === 1,
        currentYearIsQualified,
        dailyRequiredMileage: Number(row.daily_required_mileage) || 0,
        region,
        province,
        customer,
        department: info?.department || null,
        manager: info?.manager || null,
        customerAvgDaily,
        customerAvgDaily7d,
        predictedYearEnd,
        daysLeft,
        classification,
      });
    }

    // ---- Build inventory vehicles ----
    const inventoryVehicles: InventoryVehicle[] = [];
    for (const row of inventoryTruckRows) {
      const plate = row.plate_number as string;
      const loc = locationMap.get(plate);
      const province = loc?.province || '';
      const city = loc?.city || '';
      const region = mapRegion(province, city);
      const vehicleType = classifyVehicleType(row.type_name || '', row.model_raw || '');

      // Cross-reference with assessment data
      const assessment = assessmentByPlate.get(plate);
      // Compute this vehicle's own daysLeft from its assessment end date
      let invDaysLeft = 0;
      if (assessment?.current_year_assessment_end_date) {
        const endDate = new Date(assessment.current_year_assessment_end_date);
        invDaysLeft = Math.max(1, Math.ceil((endDate.getTime() - now.getTime()) / 86400000));
      } else {
        invDaysLeft = Math.max(1, Math.ceil((yearEnd.getTime() - now.getTime()) / 86400000));
      }
      inventoryVehicles.push({
        plateNumber: plate,
        vehicleType,
        region,
        province,
        totalMileage: assessment ? Number(assessment.vehicle_total_mileage) || 0 : 0,
        daysLeft: invDaysLeft,
        targetId: assessment ? (assessment.target_id as number) : null,
        targetName: assessment ? (targetMap.get(assessment.target_id)?.targetName ?? null) : null,
        yearTarget: assessment ? Number(assessment.current_year_mileage_task) || null : null,
        completionRate: assessment ? Number(assessment.completion_rate) || 0 : 0,
      });
    }

    // ---- Run algorithm ----
    const { suggestions, summary } = generateSuggestions(enrichedVehicles, inventoryVehicles);

    // ---- Attach notification status to candidates ----
    const notificationMap = await fetchActiveNotificationMap();
    for (const s of suggestions) {
      for (const c of s.candidates) {
        const key = `${s.id}::${c.plateNumber}`;
        const notif = notificationMap.get(key);
        if (notif) {
          c.notificationId = notif.id;
          c.notificationStatus = notif.status;
        }
      }
    }

    // ---- Permission filtering & customer name masking ----
    const user = (c as any).get('user') as AuthUser | undefined;

    // Attach department/manager info so filterByPermission can work
    const suggestionsWithPermFields = suggestions.map((s) => {
      const info = vehicleInfoMap.get(s.currentVehicle.plateNumber);
      return {
        ...s,
        department: info?.department || null,
        departmentName: info?.department || null,
        managerId: info?.manager_id || null,
      };
    });

    const filtered = user
      ? filterByPermission(suggestionsWithPermFields, user)
      : suggestionsWithPermFields;

    // Mask customer names in suggestions
    const masked = maskCustomerNames(
      filtered.map((s) => {
        // Strip permission-filtering fields from response
        const { department, departmentName, managerId, ...rest } = s;
        return rest;
      }),
    );

    // ---- Build target options list for filter UI ----
    const targetVehicleCounts = new Map<number, number>();
    for (const v of enrichedVehicles) {
      targetVehicleCounts.set(v.targetId, (targetVehicleCounts.get(v.targetId) || 0) + 1);
    }

    const targetOptions = targets.map((t: any) => ({
      id: t.id as number,
      name: t.target_name as string,
      vehicleCount: targetVehicleCounts.get(t.id) || 0,
    }));

    // Recalculate summary based on permission-filtered results
    const filteredQualified = masked.filter((s: any) => s.type === 'replace_qualified').length;
    const filteredHopeless = masked.filter((s: any) => s.type === 'rescue_hopeless').length;
    const recentInterventionCount = await fetchRecentInterventionCount();
    const filteredSummary: SchedulingSummary = {
      qualifiedCount: filteredQualified,
      hopelessCount: filteredHopeless,
      suggestionCount: masked.length,
      estimatedGain: masked.filter((s: any) =>
        s.candidates?.some((c: any) => c.canQualifyAfterSwap)
      ).length,
      recentInterventionCount,
    };

    const response: SchedulingResponse = {
      summary: filteredSummary,
      suggestions: masked,
      targets: targetOptions,
    };

    return c.json(response);
  } catch (e: unknown) {
    console.error('scheduling suggestions error:', e);
    return c.json(
      {
        summary: { qualifiedCount: 0, hopelessCount: 0, suggestionCount: 0, estimatedGain: 0, recentInterventionCount: 0 },
        suggestions: [],
        targets: [],
      } satisfies SchedulingResponse,
      500,
    );
  }
});

export default app;