import type { RowDataPacket } from 'mysql2/promise';
import type { AccessProfile } from '../auth/rbac-repository.js';
import type { MySqlPool } from '../db/mysql.js';
import type { OrderStatus } from './order-state-repository.js';

export class OrderQueryError extends Error {
  constructor(public readonly code: string) { super(code); }
}

export interface OrderQueryAccess {
  tenantId: string;
  userId: string;
  access: AccessProfile;
}

interface OrderListRow extends RowDataPacket {
  id: string;
  orderNo: string;
  storeId: string;
  storeName: string;
  roomId: string;
  roomName: string;
  roomNo: string;
  status: OrderStatus;
  startAt: Date;
  endAt: Date;
  totalAmountCents: number;
  paidAmountCents: number;
  latestPaymentId: string | null;
  latestPaymentProvider: string | null;
  latestPaymentStatus: string | null;
  createdAt: Date;
}

interface CountRow extends RowDataPacket { total: number }

export class OrderQueryRepository {
  constructor(private readonly pool: MySqlPool) {}

  async listMine(input: OrderQueryAccess & {
    page: number;
    pageSize: number;
    status?: OrderStatus;
  }) {
    const where = [
      'o.tenant_id = ?',
      'o.deleted_at IS NULL',
      '(a.user_id = ? OR ' + managerScopeSql(input.access, 'o.store_id') + ')'
    ];
    const params: Array<string | number> = [input.tenantId, input.userId];
    if (input.status) {
      where.push('o.status = ?');
      params.push(input.status);
    }
    const whereSql = where.join(' AND ');
    const offset = (input.page - 1) * input.pageSize;
    const [counts] = await this.pool.execute<CountRow[]>(
      `SELECT COUNT(DISTINCT o.id) AS total
       FROM qipai_orders o
       LEFT JOIN qipai_order_user_access a
         ON a.tenant_id = o.tenant_id AND a.order_id = o.id AND a.revoked_at IS NULL
       WHERE ${whereSql}`,
      params
    );
    const [rows] = await this.pool.execute<OrderListRow[]>(
      `SELECT DISTINCT o.id, o.order_no AS orderNo, o.store_id AS storeId, s.name AS storeName,
              o.room_id AS roomId, r.name AS roomName, r.room_no AS roomNo,
              o.status, o.start_at AS startAt, o.end_at AS endAt,
              o.total_amount_cents AS totalAmountCents,
              o.paid_amount_cents AS paidAmountCents, p.id AS latestPaymentId,
              p.provider AS latestPaymentProvider, p.status AS latestPaymentStatus,
              o.created_at AS createdAt
       FROM qipai_orders o
       INNER JOIN qipai_stores s ON s.tenant_id = o.tenant_id AND s.id = o.store_id
       INNER JOIN qipai_rooms r ON r.tenant_id = o.tenant_id AND r.id = o.room_id
       LEFT JOIN qipai_order_user_access a
         ON a.tenant_id = o.tenant_id AND a.order_id = o.id AND a.revoked_at IS NULL
       LEFT JOIN qipai_payments p
         ON p.tenant_id = o.tenant_id AND p.order_id = o.id
        AND p.id = (
          SELECT MAX(p2.id) FROM qipai_payments p2
          WHERE p2.tenant_id = o.tenant_id AND p2.order_id = o.id
            AND p2.deleted_at IS NULL
        )
       WHERE ${whereSql}
       ORDER BY o.created_at DESC, o.id DESC
       LIMIT ? OFFSET ?`,
      [...params, input.pageSize, offset]
    );
    return {
      items: rows.map(publicOrder),
      total: Number(counts[0]?.total ?? 0),
      page: input.page,
      pageSize: input.pageSize
    };
  }

  async getMine(input: OrderQueryAccess & { orderId: string }) {
    const result = await this.listMine({ ...input, page: 1, pageSize: 1 });
    const order = result.items.find((item) => item.id === input.orderId);
    if (order) return order;
    const [rows] = await this.pool.execute<OrderListRow[]>(
      `SELECT o.id, o.order_no AS orderNo, o.store_id AS storeId, s.name AS storeName,
              o.room_id AS roomId, r.name AS roomName, r.room_no AS roomNo,
              o.status, o.start_at AS startAt, o.end_at AS endAt,
              o.total_amount_cents AS totalAmountCents,
              o.paid_amount_cents AS paidAmountCents, p.id AS latestPaymentId,
              p.provider AS latestPaymentProvider, p.status AS latestPaymentStatus,
              o.created_at AS createdAt
       FROM qipai_orders o
       INNER JOIN qipai_stores s ON s.tenant_id = o.tenant_id AND s.id = o.store_id
       INNER JOIN qipai_rooms r ON r.tenant_id = o.tenant_id AND r.id = o.room_id
       LEFT JOIN qipai_order_user_access a
         ON a.tenant_id = o.tenant_id AND a.order_id = o.id AND a.revoked_at IS NULL
       LEFT JOIN qipai_payments p
         ON p.tenant_id = o.tenant_id AND p.order_id = o.id
        AND p.id = (
          SELECT MAX(p2.id) FROM qipai_payments p2
          WHERE p2.tenant_id = o.tenant_id AND p2.order_id = o.id
            AND p2.deleted_at IS NULL
        )
       WHERE o.tenant_id = ? AND o.id = ? AND o.deleted_at IS NULL
         AND (a.user_id = ? OR ${managerScopeSql(input.access, 'o.store_id')})
       LIMIT 1`,
      [input.tenantId, input.orderId, input.userId]
    );
    if (!rows[0]) throw new OrderQueryError('ORDER_NOT_FOUND');
    return publicOrder(rows[0]);
  }
}

function publicOrder(row: OrderListRow) {
  return {
    id: String(row.id),
    orderNo: row.orderNo,
    storeId: String(row.storeId),
    storeName: row.storeName,
    roomId: String(row.roomId),
    roomName: row.roomName,
    roomNo: row.roomNo,
    status: row.status,
    startAt: row.startAt,
    endAt: row.endAt,
    totalAmountCents: row.totalAmountCents,
    paidAmountCents: row.paidAmountCents,
    latestPayment: row.latestPaymentId === null ? null : {
      id: String(row.latestPaymentId),
      provider: row.latestPaymentProvider,
      status: row.latestPaymentStatus
    },
    createdAt: row.createdAt
  };
}

function managerScopeSql(access: AccessProfile, storeExpression: string) {
  if (access.capabilities.includes('tenant.manage') || access.roles.includes('PLATFORM_ADMIN')) {
    return '1 = 1';
  }
  if (!access.capabilities.includes('store.operation.read') || access.storeIds.length === 0) {
    return '1 = 0';
  }
  return `${storeExpression} IN (${access.storeIds.map((id) => Number(id)).join(',')})`;
}