import { ref } from 'vue'

type LeadType = 'demo' | 'download' | 'contact'

type ApiResponse<T = unknown> = {
  code: number | string
  message: string
  data?: T
  requestId?: string
  timestamp?: string | number
}

export type LeadForm = {
  name: string
  orgName: string
  phone: string
  city?: string
  position?: string
  focusArea?: string
  contact?: string
  message?: string
  type: LeadType
  extra?: Record<string, string>
}

function isSuccess(code: number | string): boolean {
  return code === 200 || code === '200' || code === 'SUCCESS'
}

function validatePhone(phone: string): boolean {
  return /^1[3-9]\d{9}$/.test(phone)
}

export function useLeadForm(type: LeadType) {
  const config = useRuntimeConfig()

  const loading = ref(false)
  const success = ref(false)
  const error = ref('')

  const form = ref<LeadForm>({
    name: '',
    orgName: '',
    phone: '',
    type
  })

  async function submit() {
    error.value = ''

    if (!form.value.name.trim()) {
      error.value = '请填写姓名'
      return
    }
    if (!form.value.orgName.trim()) {
      error.value = '请填写单位名称'
      return
    }
    if (!validatePhone(form.value.phone)) {
      error.value = '请填写正确的手机号'
      return
    }

    loading.value = true

    try {
      if (config.public.useMockLead) {
        await new Promise(resolve => setTimeout(resolve, 600))
        success.value = true
        loading.value = false
        return
      }

      const res = await $fetch<ApiResponse>(`${config.public.apiPrefix}/leads`, {
        method: 'POST',
        body: {
          ...form.value,
          source: 'official_website',
          submittedAt: new Date().toISOString()
        }
      })

      if (isSuccess(res.code)) {
        success.value = true
      } else {
        error.value = res.message || '提交失败，请稍后重试'
      }
    } catch (e: any) {
      error.value = e?.data?.message || e?.message || '网络异常，请稍后重试'
    } finally {
      loading.value = false
    }
  }

  function reset() {
    success.value = false
    error.value = ''
  }

  return { form, loading, success, error, submit, reset }
}