import crypto from 'node:crypto'

import { runtimeConfig } from '../config/runtime.js'
import { createWebhookEvent, updateWebhookEvent } from '../repositories/webhook-event-repo.js'
import { upsertOrderFromWebhook } from './order-service.js'
import { createHttpError } from '../utils/http.js'
import { nowIso } from '../utils/time.js'

export async function processAgisoTradeWebhook(requestLike) {
  const parsed = parseAgisoTradeRequest(requestLike)
  const webhookEvent = createWebhookEvent(buildWebhookEventInput(requestLike, parsed))

  return executeAgisoTradeWebhook(parsed, webhookEvent.id)
}

export async function replayAgisoTradeWebhookEvent(webhookEvent) {
  const requestLike = {
    headers: safeParseJson(webhookEvent.headers_json),
    query: safeParseJson(webhookEvent.query_json),
    body: safeParseJson(webhookEvent.body_json),
  }
  const parsed = parseAgisoTradeRequest(requestLike)

  return executeAgisoTradeWebhook(parsed, webhookEvent.id)
}

function buildWebhookEventInput(requestLike, parsed) {
  return {
    platform: 'agiso',
    eventType: parsed.eventType,
    eventKey: parsed.eventKey,
    signatureValid: parsed.signatureValid,
    headersJson: JSON.stringify(requestLike.headers || {}),
    queryJson: JSON.stringify(requestLike.query || {}),
    bodyJson: JSON.stringify(requestLike.body || {}),
    processed: false,
    processError: '',
    relatedOrderId: null,
    createdAt: nowIso(),
  }
}

async function executeAgisoTradeWebhook(parsed, webhookEventId) {
  try {
    if (!parsed.signatureValid) {
      throw createHttpError('验签失败', {
        statusCode: 400,
        errorCode: 'invalid_signature',
      })
    }

    if (!parsed.platformOrderId) {
      throw createHttpError('缺少平台订单号', {
        statusCode: 400,
        errorCode: 'missing_platform_order_id',
      })
    }

    const result = await upsertOrderFromWebhook(parsed)
    updateWebhookEvent(webhookEventId, {
      processed: true,
      process_error: '',
      related_order_id: result.order.id,
    })

    return {
      accepted: true,
      eventType: parsed.eventType,
      platformOrderId: parsed.platformOrderId,
      orderId: result.order.id,
      taskCount: result.tasks.length,
      messageDeliveries: result.messageDeliveries || [],
      tasks: result.tasks.map((task) => ({
        taskId: task.id,
        taskNo: task.task_no,
        status: task.task_status,
      })),
    }
  } catch (error) {
    updateWebhookEvent(webhookEventId, {
      processed: false,
      process_error: error instanceof Error ? error.message : String(error || ''),
      related_order_id: null,
    })
    throw error
  }
}

function parseAgisoTradeRequest(requestLike) {
  const query = normalizeRecord(requestLike.query)
  const body = normalizeRecord(requestLike.body)
  const rawJson = String(body.json || '').trim()
  const payload = rawJson ? parsePayloadJson(rawJson) : body
  const timestamp = String(query.timestamp || '').trim()
  const sign = String(query.sign || '').trim().toLowerCase()
  const eventType = resolveEventType(query.aopic)
  const signatureValid = verifyAgisoSignature({ rawJson, timestamp, sign })
  const platformOrderId = pickFirstNonEmpty([
    payload.biz_order_id,
    payload.Tid,
    payload.tid,
    payload.order_id,
    payload.orderId,
  ])

  return {
    platform: 'agiso',
    eventType,
    eventKey: `${platformOrderId || 'unknown'}:${eventType}:${timestamp || 'na'}`,
    signatureValid,
    platformOrderId,
    orderStatus: resolveOrderStatus(eventType, payload),
    payStatus: resolvePayStatus(eventType, payload),
    buyerId: pickFirstNonEmpty([payload.buyer_id, payload.buyerId, payload.openid]),
    buyerName: pickFirstNonEmpty([payload.buyer_name, payload.buyerName, payload.nick]),
    receiverContact: pickFirstNonEmpty([
      payload.receiver_contact,
      payload.receiverContact,
      payload.mobile,
      payload.phone,
    ]),
    totalAmount: normalizeInteger(
      pickFirstNonEmpty([payload.total_fee, payload.totalFee, payload.pay_fee, payload.payFee]),
    ),
    currency: pickFirstNonEmpty([payload.currency, 'CNY']) || 'CNY',
    paidAt: resolvePaidAt(eventType, payload),
    rawPayload: payload,
    items: normalizeOrderItems(payload),
  }
}

function verifyAgisoSignature({ rawJson, timestamp, sign }) {
  const appSecret = String(runtimeConfig.platforms.agiso.appSecret || '').trim()

  if (!appSecret) {
    return true
  }

  if (!rawJson || !timestamp || !sign) {
    return false
  }

  const documentedDigest = crypto
    .createHash('md5')
    .update(`${appSecret}json${rawJson}timestamp${timestamp}${appSecret}`, 'utf8')
    .digest('hex')
    .toLowerCase()

  if (documentedDigest === sign) {
    return true
  }

  const legacyDigest = crypto
    .createHash('md5')
    .update(`${appSecret}${rawJson}${timestamp}`, 'utf8')
    .digest('hex')
    .toLowerCase()

  return legacyDigest === sign
}

function resolveEventType(aopic) {
  const normalized = String(aopic || '').trim()

  if (normalized === '1') {
    return 'payment_success'
  }

  if (normalized === '32') {
    return 'trade_create'
  }

  if (normalized === '256') {
    return 'buyer_confirm_goods'
  }

  if (normalized === '128') {
    return 'trade_closed'
  }

  return 'trade_event'
}

function resolveOrderStatus(eventType, payload) {
  if (eventType === 'payment_success') {
    return 'paid'
  }

  if (eventType === 'trade_closed') {
    return 'closed'
  }

  const rawStatus = normalizeInteger(
    pickFirstNonEmpty([payload.order_status, payload.orderStatus, payload.status]),
  )

  if (rawStatus === 3 || rawStatus === 4) {
    return 'paid'
  }

  if (rawStatus === 6) {
    return 'closed'
  }

  if (rawStatus === 5) {
    return 'refunded'
  }

  return 'created'
}

function resolvePayStatus(eventType, payload) {
  if (eventType === 'payment_success') {
    return 'paid'
  }

  if (eventType === 'trade_closed') {
    return 'unpaid'
  }

  const rawStatus = normalizeInteger(
    pickFirstNonEmpty([payload.order_status, payload.orderStatus, payload.status]),
  )

  if (rawStatus === 3 || rawStatus === 4) {
    return 'paid'
  }

  if (rawStatus === 5) {
    return 'refunded'
  }

  return 'unpaid'
}

function resolvePaidAt(eventType, payload) {
  if (eventType === 'payment_success') {
    return nowIso()
  }

  const rawStatus = normalizeInteger(
    pickFirstNonEmpty([payload.order_status, payload.orderStatus, payload.status]),
  )

  if (rawStatus === 3 || rawStatus === 4) {
    return nowIso()
  }

  return null
}

function parsePayloadJson(rawJson) {
  if (!rawJson) {
    return {}
  }

  try {
    const parsed = JSON.parse(rawJson)
    return isPlainObject(parsed) ? parsed : {}
  } catch {
    throw createHttpError('json 参数不是合法 JSON', {
      statusCode: 400,
      errorCode: 'invalid_json_payload',
    })
  }
}

function normalizeOrderItems(payload) {
  const items = Array.isArray(payload.items) && payload.items.length > 0
    ? payload.items
    : [payload]

  return items.map((item) => {
    const source = isPlainObject(item) ? item : {}
    const rawSkuKey = pickFirstNonEmpty([
      source.sku_code,
      source.skuCode,
      source.goods_sku,
      source.item_id,
      source.itemId,
      source.goods_id,
      source.goodsId,
      source.num_iid,
    ])
    const skuCode = resolveSkuCode(rawSkuKey)

    return {
      skuCode,
      skuName: pickFirstNonEmpty([
        source.sku_name,
        source.skuName,
        source.goods_name,
        source.goodsName,
        skuCode,
      ]),
      quantity: Math.max(
        1,
        normalizeInteger(pickFirstNonEmpty([source.quantity, source.num, source.buy_amount])) || 1,
      ),
      spec: source,
    }
  })
}

function resolveSkuCode(rawKey) {
  const mappings = runtimeConfig.orders.skuMappings

  if (rawKey && mappings && typeof mappings === 'object') {
    const direct = mappings[String(rawKey)]
    if (typeof direct === 'string' && direct.trim()) {
      return direct.trim()
    }
  }

  if (typeof rawKey === 'string' && rawKey.trim()) {
    return rawKey.trim()
  }

  return ''
}

function normalizeRecord(value) {
  return isPlainObject(value) ? value : {}
}

function normalizeInteger(value) {
  const parsed = Number(value)
  return Number.isFinite(parsed) ? Math.round(parsed) : 0
}

function pickFirstNonEmpty(values) {
  for (const value of values) {
    const normalized = String(value || '').trim()
    if (normalized) {
      return normalized
    }
  }

  return ''
}

function isPlainObject(value) {
  return Object.prototype.toString.call(value) === '[object Object]'
}

function safeParseJson(rawValue) {
  const normalized = String(rawValue || '').trim()

  if (!normalized) {
    return {}
  }

  try {
    const parsed = JSON.parse(normalized)
    return isPlainObject(parsed) ? parsed : {}
  } catch {
    return {}
  }
}