import { useCallback, useMemo, useState } from 'react'
import Taro, { useDidShow, useRouter } from '@tarojs/taro'
import { View, Text } from '@tarojs/components'
import { Button, ConfigProvider, Empty, Loading } from '@nutui/nutui-react-taro'
import { Setting } from '@nutui/icons-react-taro'
import dayjs from 'dayjs'

import { getCreditCompany } from '@/api/credit/creditCompany'
import type { CreditCompany } from '@/api/credit/creditCompany/model'

type CustomerStatus = '保护期内' | '已签约' | '已完成' | '保护期外'

type FollowPerson = {
  name: string
  time?: string
  isCurrent?: boolean
}

const splitPhones = (raw?: string) => {
  const text = String(raw || '').trim()
  if (!text) return []
  return text
    .split(/[\s,，;；、\n\r]+/g)
    .map(s => s.trim())
    .filter(Boolean)
}

const uniq = <T,>(arr: T[]) => Array.from(new Set(arr))

const getCompanyIndustry = (c?: CreditCompany) => {
  if (!c) return ''
  return String(
    c.nationalStandardIndustryCategories6 ||
      c.nationalStandardIndustryCategories2 ||
      c.nationalStandardIndustryCategories ||
      c.institutionType ||
      ''
  ).trim()
}

const parseContactFromComments = (comments?: string) => {
  const txt = String(comments || '').trim()
  if (!txt) return ''
  const m = txt.match(/联系人：([^；;]+)/)
  return String(m?.[1] || '').trim()
}

const getStatusTextClass = (s: CustomerStatus) => {
  if (s === '保护期内') return 'text-green-600'
  if (s === '已签约') return 'text-orange-500'
  if (s === '已完成') return 'text-blue-600'
  return 'text-gray-500'
}

const normalizeFollowPeople = (company: CreditCompany): FollowPerson[] => {
  // 兼容后端可能下发多种字段；未下发时给出静态示例，保证 UI/逻辑可演示。
  const anyCompany = company as any

  const incoming: FollowPerson[] = []

  const arr1 = anyCompany?.followPeople as Array<any> | undefined
  if (Array.isArray(arr1) && arr1.length) {
    for (const it of arr1) {
      const name = String(it?.name || it?.realName || it?.userRealName || '').trim()
      if (!name) continue
      incoming.push({ name, time: it?.time || it?.date, isCurrent: !!it?.isCurrent })
    }
  }

  const arr2 = anyCompany?.followHistory as Array<any> | undefined
  if (Array.isArray(arr2) && arr2.length) {
    for (const it of arr2) {
      const name = String(it?.name || it?.realName || it?.userRealName || it || '').trim()
      if (!name) continue
      incoming.push({ name, time: it?.time || it?.date, isCurrent: !!it?.isCurrent })
    }
  }

  const currentName = String(
    anyCompany?.followRealName || anyCompany?.userRealName || anyCompany?.realName || ''
  ).trim()
  if (currentName) incoming.push({ name: currentName, isCurrent: true })

  const cleaned = incoming.filter(x => x?.name).map(x => ({ ...x, name: String(x.name).trim() }))
  const deduped: FollowPerson[] = []
  const seen = new Set<string>()
  for (const p of cleaned) {
    const k = p.name
    if (seen.has(k)) continue
    seen.add(k)
    deduped.push(p)
  }

  if (deduped.length) {
    // 规则：往期跟进人（灰色）按时间顺序在前；当前跟进人（蓝色）放在最后。
    const current = deduped.filter(p => p.isCurrent)
    const history = deduped.filter(p => !p.isCurrent)
    history.sort((a, b) => {
      const at = a.time ? dayjs(a.time).valueOf() : 0
      const bt = b.time ? dayjs(b.time).valueOf() : 0
      return at - bt
    })
    // 多个 current 时取最后一个为“当前”
    const currentOne = current.length ? current[current.length - 1] : undefined
    return currentOne ? history.concat([{ ...currentOne, isCurrent: true }]) : history
  }

  // 无真实跟进人信息：尽量展示一个可识别的占位，避免“凭空造历史数据”造成误导。
  const uid = Number(company?.userId)
  if (Number.isFinite(uid) && uid > 0) return [{ name: `员工${uid}`, isCurrent: true }]
  return []
}

const getAssignDateText = (company?: CreditCompany) => {
  const anyCompany = company as any
  const raw = anyCompany?.assignDate || anyCompany?.assignTime || anyCompany?.updateTime || anyCompany?.createTime
  const t = String(raw || '').trim()
  if (!t) return ''
  const d = dayjs(t)
  if (!d.isValid()) return t
  return d.format('YYYY-MM-DD')
}

export default function CreditCompanyDetailPage() {
  const router = useRouter()
  const companyId = useMemo(() => {
    const id = Number((router?.params as any)?.id)
    return Number.isFinite(id) && id > 0 ? id : undefined
  }, [router?.params])

  const statusBarHeight = useMemo(() => {
    try {
      const info = Taro.getSystemInfoSync()
      return Number(info?.statusBarHeight || 0)
    } catch (_e) {
      return 0
    }
  }, [])

  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [company, setCompany] = useState<CreditCompany | null>(null)

  const reload = useCallback(async () => {
    setError(null)
    setLoading(true)
    try {
      if (!companyId) throw new Error('缺少客户ID')
      const res = await getCreditCompany(companyId)
      setCompany(res as CreditCompany)
    } catch (e) {
      console.error('加载客户详情失败:', e)
      setCompany(null)
      setError(String((e as any)?.message || '加载失败'))
    } finally {
      setLoading(false)
    }
  }, [companyId])

  useDidShow(() => {
    reload().then()
  })

  const name = useMemo(() => {
    const c = company || ({} as CreditCompany)
    return String(c.matchName || c.name || '').trim()
  }, [company])

  const code = useMemo(() => String(company?.code || '').trim(), [company?.code])
  const industry = useMemo(() => getCompanyIndustry(company || undefined), [company])
  const contact = useMemo(() => parseContactFromComments(company?.comments), [company?.comments])

  const phones = useMemo(() => {
    const arr = [...splitPhones(company?.tel), ...splitPhones(company?.moreTel)]
    return uniq(arr)
  }, [company?.moreTel, company?.tel])

  const address = useMemo(() => {
    const c = company || ({} as CreditCompany)
    const region = [c.province, c.city, c.region].filter(Boolean).join('')
    const addr = String(c.address || '').trim()
    return (region + addr).trim() || region || addr
  }, [company])

  const followPeople = useMemo(() => (company ? normalizeFollowPeople(company) : []), [company])
  const assignDate = useMemo(() => getAssignDateText(company || undefined), [company])

  const customerStatus = useMemo(() => {
    const anyCompany = company as any
    const raw = String(anyCompany?.customerStatus || anyCompany?.statusText || '').trim()
    const allowed: CustomerStatus[] = ['保护期内', '已签约', '已完成', '保护期外']
    if (allowed.includes(raw as any)) return raw as CustomerStatus
    return '保护期内'
  }, [company])

  const headerOffset = statusBarHeight + 80

  return (
    <View className="bg-pink-50 min-h-screen">
      <ConfigProvider>
        <View className="fixed z-50 top-0 left-0 right-0 bg-pink-50" style={{ paddingTop: `${statusBarHeight}px` }}>
          <View className="px-4 h-10 flex items-center justify-between text-sm text-gray-900">
            <Text className="font-medium">12:00</Text>
            <View className="flex items-center gap-2 text-xs text-gray-600">
              <Text>信号</Text>
              <Text>Wi-Fi</Text>
              <Text>电池</Text>
            </View>
          </View>

          <View className="px-4 pb-2 flex items-center justify-between">
            <Text className="text-sm text-gray-700" onClick={() => Taro.navigateBack()}>
              返回
            </Text>
            <Text className="text-base font-semibold text-gray-900">客户详情</Text>
            <View className="flex items-center gap-3">
              <View
                className="w-7 h-7 rounded-full border border-gray-300 flex items-center justify-center text-gray-700"
                onClick={async () => {
                  try {
                    const res = await Taro.showActionSheet({ itemList: ['编辑客户', '刷新'] })
                    if (res.tapIndex === 0 && companyId) Taro.navigateTo({ url: `/credit/my-customer/edit?id=${companyId}` })
                    if (res.tapIndex === 1) reload()
                  } catch (e) {
                    const msg = String((e as any)?.errMsg || (e as any)?.message || e || '')
                    if (msg.includes('cancel')) return
                  }
                }}
              >
                <Text>...</Text>
              </View>
              <View
                className="w-7 h-7 rounded-full border border-gray-300 flex items-center justify-center text-gray-700"
                onClick={() => Taro.showToast({ title: '设置（示意）', icon: 'none' })}
              >
                <Setting size={14} />
              </View>
            </View>
          </View>
        </View>

        <View style={{ paddingTop: `${headerOffset}px` }} className="max-w-md mx-auto px-4 pb-24">
          {loading ? (
            <View className="py-16 flex justify-center items-center text-gray-500">
              <Loading />
              <Text className="ml-2">加载中...</Text>
            </View>
          ) : error ? (
            <View className="bg-white rounded-xl border border-pink-100 p-6">
              <View className="text-red-500 text-sm">{error}</View>
              <View className="mt-4">
                <Button type="primary" onClick={reload}>
                  重试
                </Button>
              </View>
            </View>
          ) : !company ? (
            <View className="bg-white rounded-xl border border-pink-100 py-10">
              <Empty description="暂无客户信息" />
            </View>
          ) : (
            <View className="bg-white rounded-xl border border-pink-100 p-4">
              <View className="text-base font-semibold text-gray-900">{name || '—'}</View>

              <View className="mt-3 space-y-3 text-sm">
                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">统一代码</Text>
                  <Text className="text-gray-400 text-right break-all">{code || '—'}</Text>
                </View>

                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">所属行业</Text>
                  <Text className="text-red-500 text-right break-all">{industry || '—'}</Text>
                </View>

                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">客户联系人</Text>
                  <Text className="text-gray-400 text-right break-all">{contact || '—'}</Text>
                </View>

                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">客户联系方式</Text>
                  <View className="text-right">
                    {phones.length ? (
                      <Text className="text-gray-400 break-all">{phones.join('，')}</Text>
                    ) : (
                      <Text className="text-gray-400">—</Text>
                    )}
                  </View>
                </View>

                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">地址</Text>
                  <Text className="text-gray-700 text-right break-all">{address || '—'}</Text>
                </View>

                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">跟进人</Text>
                  <View className="text-right">
                    {followPeople.length ? (
                      followPeople.map((p, idx) => (
                        <Text
                          key={`${p.name}-${idx}`}
                          className={p.isCurrent ? 'text-blue-600 break-all' : 'text-gray-400 break-all'}
                        >
                          {idx === followPeople.length - 1 ? p.name : `${p.name}，`}
                        </Text>
                      ))
                    ) : (
                      <Text className="text-gray-400">—</Text>
                    )}
                  </View>
                </View>

                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">分配日期</Text>
                  <Text className="text-gray-400 text-right">{assignDate || '—'}</Text>
                </View>

                <View className="flex items-start justify-between gap-3">
                  <Text className="text-gray-500">客户状态</Text>
                  <Text className={`${getStatusTextClass(customerStatus)} text-right`}>{customerStatus}</Text>
                </View>
              </View>
            </View>
          )}
        </View>

        <View className="fixed z-50 bottom-0 left-0 right-0 bg-pink-50 px-4 py-4 safe-area-bottom">
          <Button
            type="primary"
            block
            style={{ background: '#ef4444', borderColor: '#ef4444' }}
            onClick={() => {
              if (!companyId) {
                Taro.showToast({ title: '缺少客户ID', icon: 'none' })
                return
              }
              Taro.navigateTo({ url: `/credit/my-customer/follow-step1?id=${companyId}` })
            }}
          >
            跟进
          </Button>
        </View>
      </ConfigProvider>
    </View>
  )
}
