import { query } from '../db/client.js'
import type {
  OrderCreateInput,
  OrderListQueryInput,
  OrderUpdateInput,
} from '../types/repository-inputs.js'
import type {
  OrderListQueryResult,
  OrderListRow,
  OrderRow,
} from '../types/repository-rows.js'

type OrderPlatformLookupInput = {
  provider?: string
  platform: string
  shopId?: string
  platformOrderId: string
}

type OrderPlatformCandidateLookupInput = {
  provider?: string
  platform?: string
  shopIds?: unknown[]
  platformOrderId?: string
}

export async function findOrderByPlatformOrderId({
  provider = '91kaquan',
  platform,
  shopId = '',
  platformOrderId,
}: OrderPlatformLookupInput): Promise<OrderRow | null> {
  const result = await query<OrderRow>(
    `
      SELECT *
      FROM orders
      WHERE provider = $1 AND platform = $2 AND shop_id = $3 AND platform_order_id = $4
      LIMIT 1
    `,
    [provider, platform, shopId, platformOrderId],
  )

  return result.rows[0] || null
}

export async function findOrderByPlatformOrderIdCandidates({
  provider = '91kaquan',
  platform,
  shopIds = [],
  platformOrderId,
}: OrderPlatformCandidateLookupInput): Promise<OrderRow | null> {
  const normalizedShopIds = [...new Set((Array.isArray(shopIds) ? shopIds : [])
    .map((item) => String(item || '').trim())
    .filter(Boolean))]

  if (!platform || !platformOrderId || normalizedShopIds.length === 0) {
    return null
  }

  const result = await query<OrderRow>(
    `
      SELECT *
      FROM orders
      WHERE provider = $1 AND platform = $2 AND shop_id = ANY($3::text[]) AND platform_order_id = $4
      ORDER BY id DESC
      LIMIT 1
    `,
    [provider, platform, normalizedShopIds, platformOrderId],
  )

  return result.rows[0] || null
}

export async function createOrder(input: OrderCreateInput): Promise<OrderRow | null> {
  const result = await query<OrderRow>(
    `
      INSERT INTO orders (
        provider,
        platform,
        shop_id,
        shop_name,
        platform_order_id,
        order_status,
        pay_status,
        buyer_id,
        buyer_name,
        receiver_contact,
        total_amount,
        currency,
        raw_payload_json,
        paid_at,
        created_at,
        updated_at
      ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13::jsonb, $14, $15, $16)
      RETURNING *
    `,
    [
      input.provider,
      input.platform,
      input.shopId,
      input.shopName,
      input.platformOrderId,
      input.orderStatus,
      input.payStatus,
      input.buyerId,
      input.buyerName,
      input.receiverContact,
      input.totalAmount,
      input.currency,
      input.rawPayloadJson || '{}',
      input.paidAt || null,
      input.createdAt,
      input.updatedAt,
    ],
  )

  return result.rows[0] || null
}

export async function updateOrder(orderId: number | string, input: OrderUpdateInput): Promise<OrderRow | null> {
  const result = await query<OrderRow>(
    `
      UPDATE orders
      SET
        provider = $1,
        platform = $2,
        shop_id = $3,
        shop_name = $4,
        order_status = $5,
        pay_status = $6,
        buyer_id = $7,
        buyer_name = $8,
        receiver_contact = $9,
        total_amount = $10,
        currency = $11,
        raw_payload_json = $12::jsonb,
        paid_at = $13,
        updated_at = $14
      WHERE id = $15
      RETURNING *
    `,
    [
      input.provider,
      input.platform,
      input.shopId,
      input.shopName,
      input.orderStatus,
      input.payStatus,
      input.buyerId,
      input.buyerName,
      input.receiverContact,
      input.totalAmount,
      input.currency,
      input.rawPayloadJson || '{}',
      input.paidAt || null,
      input.updatedAt,
      Number(orderId),
    ],
  )

  return result.rows[0] || null
}

export async function getOrderById(orderId: number | string): Promise<OrderRow | null> {
  const result = await query<OrderRow>('SELECT * FROM orders WHERE id = $1 LIMIT 1', [Number(orderId)])
  return result.rows[0] || null
}

export async function listOrders({
  page = 1,
  pageSize = 20,
  platformOrderId = '',
  payStatus = '',
  skuCode = '',
  dateFrom = '',
  dateTo = '',
}: OrderListQueryInput = {}): Promise<OrderListQueryResult> {
  const offset = (page - 1) * pageSize
  const filters: string[] = []
  const params: unknown[] = []

  if (platformOrderId) {
    params.push(`%${platformOrderId}%`)
    filters.push(`o.platform_order_id ILIKE $${params.length}`)
  }

  if (payStatus) {
    params.push(payStatus)
    filters.push(`o.pay_status = $${params.length}`)
  }

  if (skuCode) {
    params.push(skuCode)
    filters.push(`EXISTS (SELECT 1 FROM order_items oi WHERE oi.order_id = o.id AND oi.sku_code = $${params.length})`)
  }

  if (dateFrom) {
    params.push(dateFrom)
    filters.push(`o.created_at >= $${params.length}`)
  }

  if (dateTo) {
    params.push(dateTo)
    filters.push(`o.created_at <= $${params.length}`)
  }

  const whereClause = filters.length > 0 ? `WHERE ${filters.join(' AND ')}` : ''
  const totalResult = await query<{ [column: string]: unknown, total: number }>(
    `SELECT COUNT(*)::int AS total FROM orders o ${whereClause}`,
    params,
  )

  params.push(pageSize)
  params.push(offset)
  const itemsResult = await query<OrderListRow>(
    `
      SELECT
        o.*,
        (SELECT COUNT(*)::int FROM fulfillment_tasks ft WHERE ft.order_id = o.id) AS task_count
      FROM orders o
      ${whereClause}
      ORDER BY o.id DESC
      LIMIT $${params.length - 1} OFFSET $${params.length}
    `,
    params,
  )

  return {
    items: itemsResult.rows,
    total: Number(totalResult.rows[0]?.total || 0),
  }
}