import api from '../../utils/api'

interface EligibilityEvidence {
  fileId?: string
}

interface EligibilityStatusResponse {
  eligibilityType?: string
  evidences?: EligibilityEvidence[]
}

interface UploadedFile {
  fileKey: string
}

const errorMessage = (error: unknown, fallback: string) =>
  error instanceof Error ? error.message : (error as { message?: string })?.message || fallback

Page({
  data: {
    eligibilityType: '',
    selectedType: '',
    uploadedFileIds: [] as string[],
    uploading: false,
    submitting: false,
    maxFiles: 5,
    evidenceTypes: [
      { value: 'employment_proof', label: '工作证明', desc: '劳动合同、工牌或在职证明等' },
      { value: 'residence_proof', label: '居住证明', desc: '房产证、租赁合同或水电账单等' },
      { value: 'household_proof', label: '户籍证明', desc: '户口本或户籍页等' },
      { value: 'other', label: '其他材料', desc: '能够说明您在丹阳生活或工作的材料' },
    ],
  },

  onLoad(options: Record<string, string>) {
    this.setData({ eligibilityType: options.type || '' })
  },

  onShow() {
    this.loadStatus()
  },

  async loadStatus() {
    try {
      const result = await api.get<EligibilityStatusResponse>('/local-eligibility')
      this.setData({
        eligibilityType: this.data.eligibilityType || result.eligibilityType || '',
        uploadedFileIds: (result.evidences || []).map((item) => item.fileId).filter(Boolean),
      })
    } catch {
      // 页面仍允许用户重新选择并提交，错误会在具体操作时反馈。
    }
  },

  onEvidenceTypeSelect(event: WechatMiniprogram.TouchEvent) {
    this.setData({ selectedType: event.currentTarget.dataset.type as string })
  },

  onChooseImage() {
    if (!this.data.selectedType) {
      wx.showToast({ title: '请先选择佐证类型', icon: 'none' })
      return
    }
    const remaining = this.data.maxFiles - this.data.uploadedFileIds.length
    if (remaining <= 0) {
      wx.showToast({ title: `最多上传${this.data.maxFiles}份材料`, icon: 'none' })
      return
    }
    wx.chooseMedia({
      count: remaining,
      mediaType: ['image'],
      sourceType: ['album', 'camera'],
      success: ({ tempFiles }) => this.uploadFiles(tempFiles || []),
    })
  },

  async uploadFiles(files: WechatMiniprogram.ChooseMediaSuccessCallbackResult['tempFiles']) {
    this.setData({ uploading: true })
    try {
      for (const file of files) {
        const uploaded = await this.uploadSingleFile(file.tempFilePath)
        await api.post('/local-eligibility/evidences', {
          evidenceType: this.data.selectedType,
          fileId: uploaded.fileKey,
        })
        this.setData({ uploadedFileIds: [...this.data.uploadedFileIds, uploaded.fileKey] })
      }
      wx.showToast({ title: '材料已上传', icon: 'success' })
    } catch (error) {
      wx.showToast({ title: errorMessage(error, '上传失败，请重试'), icon: 'none' })
    } finally {
      this.setData({ uploading: false })
    }
  },

  uploadSingleFile(filePath: string): Promise<UploadedFile> {
    return new Promise((resolve, reject) => {
      wx.uploadFile({
        url: `${api.baseURL}/photos/upload`,
        filePath,
        name: 'file',
        formData: { photoType: 'local_eligibility', sortOrder: '0' },
        header: { Authorization: `Bearer ${api.getToken() || ''}` },
        success(result) {
          let body: { success?: boolean; message?: string; data?: UploadedFile }
          try {
            body = JSON.parse(result.data || '{}')
          } catch {
            reject(new Error('上传响应格式错误'))
            return
          }
          if (result.statusCode === 200 && body.success && body.data?.fileKey) {
            resolve(body.data)
          } else {
            reject(new Error(body.message || '上传失败'))
          }
        },
        fail() {
          reject(new Error('网络连接失败'))
        },
      })
    })
  },

  onRemoveImage(event: WechatMiniprogram.TouchEvent) {
    const index = Number(event.currentTarget.dataset.index)
    this.setData({
      uploadedFileIds: this.data.uploadedFileIds.filter((_, itemIndex) => itemIndex !== index),
    })
  },

  async submitEligibility() {
    await api.post('/local-eligibility/declaration', {
      eligibilityType: this.data.eligibilityType,
      regionCode: '321181',
    })
    return api.post('/local-eligibility/submit')
  },

  async onSubmit() {
    if (!this.data.eligibilityType) {
      wx.showToast({ title: '请选择本地资格类型', icon: 'none' })
      return
    }
    this.setData({ submitting: true })
    try {
      await this.submitEligibility()
      wx.showToast({ title: '已提交审核', icon: 'success' })
      setTimeout(() => wx.navigateBack(), 800)
    } catch (error) {
      wx.showToast({ title: errorMessage(error, '提交失败，请重试'), icon: 'none' })
    } finally {
      this.setData({ submitting: false })
    }
  },
})