/**
 * 报销模块 API（REST，协议 code===0 / msg / data.rows）
 * 路径挂在 /api 下：/reimburses、/advances、/expense-items、/attachments
 */
import { request, parseResponseJson } from '@/utils/request'

function unwrap(res) {
  const body = parseResponseJson(res)
  if (!body || typeof body !== 'object') {
    throw new Error('接口响应异常')
  }
  if (body.code != null && body.code !== 0) {
    throw new Error(body.msg || body.message || '请求失败')
  }
  return body.data != null ? body.data : body
}

async function get(url, params = {}) {
  const res = await request({ url, method: 'GET', data: params, params })
  return unwrap(res)
}

async function post(url, data = {}) {
  const res = await request({ url, method: 'POST', data })
  return unwrap(res)
}

async function put(url, data = {}, params = {}) {
  const res = await request({ url, method: 'PUT', data, params })
  return unwrap(res)
}

function pageParams(query = {}) {
  const { pageNum, page, pageSize, ...rest } = query
  const params = {
    page: pageNum ?? page ?? 1,
    pageSize: pageSize ?? 20
  }
  Object.keys(rest).forEach((k) => {
    if (rest[k] != null && rest[k] !== '') params[k] = rest[k]
  })
  return params
}

function normalizeList(data) {
  if (Array.isArray(data)) return { rows: data, total: data.length }
  const d = data || {}
  return {
    rows: d.rows || d.list || [],
    total: d.total ?? 0
  }
}

// ── 费用项目 ──

export async function getExpenseItemTree() {
  const data = await get('/expense-items/tree')
  return Array.isArray(data) ? data : []
}

/** 展平可选叶子费用项目（供 picker） */
export function flattenExpenseLeaves(tree, path = []) {
  const out = []
  ;(tree || []).forEach((node) => {
    const name = node.itemName || node.item_name || ''
    const nextPath = path.concat(name)
    const children = node.children || []
    if (children.length) {
      out.push(...flattenExpenseLeaves(children, nextPath))
    } else {
      out.push({
        id: String(node.id),
        name,
        pathLabel: nextPath.join(' / ')
      })
    }
  })
  return out
}

// ── 报销 ──

export async function listMyReimburse(query = {}) {
  return normalizeList(await get('/reimburses/my', pageParams(query)))
}

export async function listPendingReimburse(query = {}) {
  return normalizeList(await get('/reimburses/pending-approval', pageParams(query)))
}

export async function listApprovedByMeReimburse(query = {}) {
  return normalizeList(await get('/reimburses/approved-by-me', pageParams(query)))
}

export async function getReimburse(id) {
  return get(`/reimburses/${String(id)}`)
}

export async function generateReimburseTitle(reimburseDate) {
  const params = {}
  if (reimburseDate) params.reimburseDate = reimburseDate
  return get('/reimburses/generate-title', params)
}

export function createReimburse(data) {
  return post('/reimburses/', data)
}

export function updateReimburse(id, data) {
  return put(`/reimburses/${String(id)}`, data)
}

export function submitReimburse(id) {
  return post(`/reimburses/${String(id)}/submit`)
}

export function approveReimburse(id, approvalOpinion = '') {
  return post(`/reimburses/${String(id)}/approve`, { approvalOpinion })
}

export function rejectReimburse(id, approvalOpinion = '') {
  return post(`/reimburses/${String(id)}/reject`, { approvalOpinion })
}

export async function getReimburseApprovalHistory(id) {
  const data = await get(`/reimburses/${String(id)}/approval-history`)
  return Array.isArray(data) ? data : []
}

// ── 借款（备用金） ──

export async function listMyAdvance(query = {}) {
  return normalizeList(await get('/advances/my', pageParams(query)))
}

export async function listPendingAdvance(query = {}) {
  return normalizeList(await get('/advances/pending-approval', pageParams(query)))
}

export async function listApprovedByMeAdvance(query = {}) {
  return normalizeList(await get('/advances/approved-by-me', pageParams(query)))
}

export async function getAdvance(id) {
  return get(`/advances/${String(id)}`)
}

export function createAdvance(data) {
  return post('/advances/', data)
}

export function submitAdvance(id) {
  return post(`/advances/${String(id)}/submit`)
}

export function approveAdvance(id, approvalOpinion = '') {
  return post(`/advances/${String(id)}/approve`, { approvalOpinion })
}

export function rejectAdvance(id, approvalOpinion = '') {
  return post(`/advances/${String(id)}/reject`, { approvalOpinion })
}

export async function getAdvanceApprovalHistory(id) {
  const data = await get(`/advances/${String(id)}/approval-history`)
  return Array.isArray(data) ? data : []
}

// ── 附件 ──

export async function listAttachments(bizType, bizId) {
  const data = await get('/attachments/list', {
    biz_type: bizType,
    biz_id: String(bizId)
  })
  return Array.isArray(data) ? data : []
}

export async function bindAttachments(ids, bizType, bizId) {
  if (!ids?.length) return 0
  const q = [
    `ids=${encodeURIComponent(ids.map(String).join(','))}`,
    `biz_type=${encodeURIComponent(bizType)}`,
    `biz_id=${encodeURIComponent(String(bizId))}`
  ].join('&')
  return put(`/attachments/bind-biz?${q}`, {})
}

export async function previewAttachment(id) {
  return get(`/attachments/preview/${String(id)}`)
}