import pool from '../../db/mysql.js';
import type { VehicleInfoRow } from './types.js';

/** 车辆关联信息 SQL（客户名、部门、经理、租赁状态、主体、项目、品牌） */
export const VEHICLE_INFO_SQL = `SELECT
    vi.plate_number AS plate,
    vi.vin AS vin,
    COALESCE(c.customer_name, vor.customer_name, ci.customer_name) AS customer,
    COALESCE(c.business_department_name, vor.business_dept) AS department,
    COALESCE(c.business_manager_name, vor.business_manager) AS manager,
    CAST(COALESCE(c.business_manager_id, vi.business_id) AS CHAR) AS manager_id,
    CASE vs.operation_status
      WHEN '1' THEN '租赁'
      WHEN '2' THEN '自营'
      WHEN '3' THEN '可运营'
      WHEN '4' THEN '待运营'
      WHEN '5' THEN '退出运营'
      ELSE vs.operation_status
    END AS rent_status,
    NULLIF(vi.registered_ownership, '') AS entity,
    COALESCE(c.project_name, vor.project_name) AS project,
    COALESCE(vi_operation_city.NAME, NULLIF(vi.operation_city, '')) AS inventory_location,
    CASE vm.brand
      WHEN 'hyundai' THEN CASE WHEN vm.model LIKE '%帕力安%' OR vm.model LIKE '%冷链%' OR vm.model LIKE '%双飞翼%' THEN '帕力安牌' ELSE '现代' END
      WHEN 'yuejin' THEN '跃进'
      WHEN 'feichi' THEN '飞驰'
      WHEN 'sulong' THEN '苏龙'
      WHEN 'higer' THEN '海格'
      WHEN 'dongfeng' THEN '东风'
      WHEN 'yutong' THEN '宇通'
      WHEN 'chufeng' THEN '楚风'
      WHEN 'tonghua' THEN '通华'
      WHEN 'maxus' THEN '大通'
      WHEN 'mingwei' THEN '明威'
      WHEN 'wanfeng' THEN '万风'
      WHEN 'shujie' THEN '舒捷'
      WHEN 'denza' THEN '腾势'
      WHEN 'hongyan' THEN '红岩'
      WHEN 'yuanchang brand' THEN '远程牌'
      WHEN 'others' THEN '其他'
      ELSE vm.brand
    END AS brand_label
FROM vehicle_info vi
LEFT JOIN vehicle_status vs
       ON vs.vehicle_id = vi.id
      AND vs.del_flag = 0
LEFT JOIN vehicle_model vm
       ON vm.id = vi.vehicle_model_id
      AND vm.del_flag = '0'
LEFT JOIN common_district vi_operation_city
       ON vi_operation_city.CODE = vi.operation_city COLLATE utf8mb4_unicode_ci
      AND vi_operation_city.STATUS = 'VALID'
LEFT JOIN vehicle_lease_order_record vor
       ON vor.vehicle_id = vi.id
      AND vor.del_flag = '0'
      AND vor.id = (
        SELECT MAX(vor2.id)
        FROM vehicle_lease_order_record vor2
        WHERE vor2.vehicle_id = vi.id
          AND vor2.del_flag = '0'
      )
LEFT JOIN vehicle_lease_contract_info c
       ON c.order_id = vor.contract_id
      AND c.del_flag = '0'
LEFT JOIN customer_info ci
       ON ci.id = vi.customer_id
      AND ci.del_flag = '0'
WHERE vi.del_flag = '0'
  AND COALESCE(vs.operation_status, '') <> '5'`;

/** 查询所有车辆关联信息，返回 plate→info 的 Map */
export async function fetchVehicleInfoMap(): Promise<Map<string, VehicleInfoRow>> {
  const [rows] = await pool.execute(VEHICLE_INFO_SQL) as [VehicleInfoRow[], unknown];
  const map = new Map<string, VehicleInfoRow>();
  for (const row of rows) {
    map.set(row.plate, row);
  }
  return map;
}

/** 查询指定车牌的关联信息 */
export async function fetchVehicleInfoByPlates(plates: string[]): Promise<Map<string, VehicleInfoRow>> {
  if (plates.length === 0) return new Map();
  const [rows] = await pool.execute(
    `${VEHICLE_INFO_SQL} AND vi.plate_number IN (${plates.map(() => '?').join(',')})`,
    plates
  ) as [VehicleInfoRow[], unknown];
  const map = new Map<string, VehicleInfoRow>();
  for (const row of rows) {
    map.set(row.plate, row);
  }
  return map;
}