import { ref, watch } from 'vue'
import { ElMessage } from 'element-plus'
import type { ModelInfo, ModelForm, ModelTypeOption, ProviderOption } from './types'

// API 基础 URL
const API_BASE = 'http://localhost:8082'

export function useModelSettings() {
  // Model 列表
  const models = ref<ModelInfo[]>([])
  const modelsLoading = ref(false)

  // Model Type 选项
  const modelTypeOptions: ModelTypeOption[] = [
    { value: 'chat', label: 'Chat' },
    { value: 'embedding', label: 'Embedding' },
    { value: 'rerank', label: 'Rerank' },
    { value: 'vlm', label: 'VLM' },
  ]

  // Provider 选项
  const providerOptions: ProviderOption[] = [
    { value: 'OpenAI', label: 'OpenAI' },
    { value: 'Ollama', label: 'Ollama' },
    { value: 'ali', label: 'Alibaba Cloud' },
  ]

  // 默认 Base URL 映射
  const defaultBaseUrls: Record<string, string> = {
    OpenAI: 'http://localhost:1234/v1',
    Ollama: 'http://localhost:11434',
    ali: 'https://dashscope.aliyuncs.com/compatible-mode/v1',
  }

  // 是否显示新增模型表单
  const showAddModelForm = ref(false)

  // 是否显示编辑模型表单
  const showEditModelForm = ref(false)

  // 新增模型表单
  const newModelForm = ref<ModelForm>({
    name: '',
    apiKey: '',
    apiEndpoint: '',
    baseUrl: '',
    provider: '',
    model: '',
    modelType: 'chat',
  })

  // 监听 provider 变化，自动填充默认 Base URL
  watch(() => newModelForm.value.provider, (newProvider) => {
    if (newProvider && defaultBaseUrls[newProvider]) {
      newModelForm.value.baseUrl = defaultBaseUrls[newProvider]
    }
  })

  // 监听新增弹窗打开，重置连接状态
  watch(showAddModelForm, (newVal) => {
    if (newVal) {
      connectionStatus.value = 'idle'
    }
  })

  // 编辑模型表单
  const editForm = ref<ModelForm>({
    name: '',
    apiKey: '',
    apiEndpoint: '',
    baseUrl: '',
    provider: '',
    model: '',
    modelType: '',
  })

  // 当前编辑的模型ID
  const editingModelId = ref<string>('')

  // 测试连接状态
  const testingConnection = ref(false)
  const connectionStatus = ref<'idle' | 'success' | 'error'>('idle')

  // 编辑弹窗测试连接状态
  const testingEditConnection = ref(false)
  const editConnectionStatus = ref<'idle' | 'success' | 'error'>('idle')

  // 编辑前模型的状态
  const originalStatus = ref<string>('')

  // 获取模型列表
  const fetchModels = async () => {
    modelsLoading.value = true
    try {
      const response = await fetch(`${API_BASE}/model/list`)
      const result = await response.json()
      models.value = result.list || []
    } catch (error) {
      console.error('Failed to fetch models:', error)
      ElMessage.error('Failed to load models')
    } finally {
      modelsLoading.value = false
    }
  }

  // 测试连接
  const testConnection = async () => {
    if (!newModelForm.value.apiKey || !newModelForm.value.baseUrl) {
      ElMessage.warning('Please enter API Key and Base URL')
      return
    }

    testingConnection.value = true
    connectionStatus.value = 'idle'

    try {
      const response = await fetch(`${API_BASE}/model/test`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          provider: newModelForm.value.provider,
          model: newModelForm.value.model,
          model_type: newModelForm.value.modelType || 'chat',
          api_key: newModelForm.value.apiKey,
          base_url: newModelForm.value.baseUrl,
          api_endpoint: newModelForm.value.apiEndpoint,
        }),
      })

      const result = await response.json()

      if (result.success) {
        connectionStatus.value = 'success'
        ElMessage.success(result.message || 'Connection successful!')
      } else {
        connectionStatus.value = 'error'
        ElMessage.error(result.message || 'Connection failed')
      }
    } catch (error: any) {
      connectionStatus.value = 'error'
      ElMessage.error('Connection failed: ' + error.message)
    } finally {
      testingConnection.value = false
    }
  }

  // 编辑弹窗测试连接
  const testConnectionEdit = async () => {
    if (!editForm.value.apiKey || !editForm.value.baseUrl) {
      ElMessage.warning('Please enter API Key and Base URL')
      return
    }

    testingEditConnection.value = true
    editConnectionStatus.value = 'idle'

    try {
      const response = await fetch(`${API_BASE}/model/test`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          provider: editForm.value.provider,
          model: editForm.value.model,
          model_type: editForm.value.modelType || 'chat',
          api_key: editForm.value.apiKey,
          base_url: editForm.value.baseUrl,
          api_endpoint: editForm.value.apiEndpoint,
        }),
      })

      const result = await response.json()

      if (result.success) {
        editConnectionStatus.value = 'success'
        ElMessage.success(result.message || 'Connection successful!')
      } else {
        editConnectionStatus.value = 'error'
        ElMessage.error(result.message || 'Connection failed')
      }
    } catch (error: any) {
      editConnectionStatus.value = 'error'
      ElMessage.error('Connection failed: ' + error.message)
    } finally {
      testingEditConnection.value = false
    }
  }

  // 添加新模型（初始状态为 inactive，需要测试连接后才能激活）
  const addModel = async () => {
    if (!newModelForm.value.name || !newModelForm.value.provider || !newModelForm.value.model) {
      ElMessage.warning('Please fill in required fields')
      return
    }

    try {
      const response = await fetch(`${API_BASE}/model/add`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          name: newModelForm.value.name,
          model_type: newModelForm.value.modelType || 'chat',
          provider: newModelForm.value.provider,
          model: newModelForm.value.model,
          api_key: newModelForm.value.apiKey,
          base_url: newModelForm.value.baseUrl,
          api_endpoint: newModelForm.value.apiEndpoint,
          status: connectionStatus.value === 'success' ? 'active' : 'inactive',
        }),
      })

      if (response.ok) {
        const result = await response.json()
        const wasConnected = connectionStatus.value === 'success'
        models.value.push(result)
        newModelForm.value = {
          name: '',
          apiKey: '',
          apiEndpoint: '',
          baseUrl: '',
          provider: '',
          model: '',
          modelType: 'chat',
        }
        connectionStatus.value = 'idle'
        showAddModelForm.value = false
        ElMessage.success(wasConnected ? 'Model added and activated' : 'Model added successfully')
      } else {
        const error = await response.json()
        ElMessage.error(error.message || 'Failed to add model')
      }
    } catch (error: any) {
      ElMessage.error('Failed to add model: ' + error.message)
    }
  }

  // 取消添加
  const cancelAddModel = () => {
    newModelForm.value = {
      name: '',
      apiKey: '',
      apiEndpoint: '',
      baseUrl: '',
      provider: '',
      model: '',
      modelType: '',
    }
    connectionStatus.value = 'idle'
    showAddModelForm.value = false
  }

  // 删除模型
  const deleteModel = async (id: string) => {
    try {
      const response = await fetch(`${API_BASE}/model/${id}`, {
        method: 'DELETE',
      })

      if (response.ok) {
        models.value = models.value.filter(m => m.id !== id)
        ElMessage.success('Model deleted successfully')
      } else {
        ElMessage.error('Failed to delete model')
      }
    } catch (error: any) {
      ElMessage.error('Failed to delete model: ' + error.message)
    }
  }

  // 打开编辑弹窗
  const openEditDialog = (model: ModelInfo) => {
    editingModelId.value = model.id
    editForm.value = {
      name: model.name,
      apiKey: model.api_key,
      apiEndpoint: model.api_endpoint,
      baseUrl: model.base_url,
      provider: model.provider,
      model: model.model,
      modelType: model.model_type,
    }
    originalStatus.value = model.status
    editConnectionStatus.value = 'idle'
    showEditModelForm.value = true
  }

  // 更新模型
  const updateModel = async () => {
    if (!editingModelId.value || !editForm.value.name || !editForm.value.provider || !editForm.value.model) {
      ElMessage.warning('Please fill in required fields')
      return
    }

    // 根据测试连接结果设置状态
    // 用户测试通过 -> active
    // 用户测试失败 -> error
    // 用户没有测试 -> inactive
    let newStatus = 'inactive'
    if (editConnectionStatus.value === 'success') {
      newStatus = 'active'
    } else if (editConnectionStatus.value === 'error') {
      newStatus = 'error'
    }

    try {
      const response = await fetch(`${API_BASE}/model/${editingModelId.value}`, {
        method: 'PUT',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          name: editForm.value.name,
          model_type: editForm.value.modelType || 'chat',
          provider: editForm.value.provider,
          model: editForm.value.model,
          api_key: editForm.value.apiKey,
          base_url: editForm.value.baseUrl,
          api_endpoint: editForm.value.apiEndpoint,
          status: newStatus,
        }),
      })

      if (response.ok) {
        const result = await response.json()
        const index = models.value.findIndex(m => m.id === editingModelId.value)
        if (index !== -1) {
          models.value[index] = result
        }
        showEditModelForm.value = false
        ElMessage.success('Model updated successfully')
      } else {
        const error = await response.json()
        ElMessage.error(error.message || 'Failed to update model')
      }
    } catch (error: any) {
      ElMessage.error('Failed to update model: ' + error.message)
    }
  }

  // 取消编辑
  const cancelEditModel = () => {
    editForm.value = {
      name: '',
      apiKey: '',
      apiEndpoint: '',
      baseUrl: '',
      provider: '',
      model: '',
      modelType: '',
    }
    editingModelId.value = ''
    showEditModelForm.value = false
  }

  return {
    // State
    models,
    modelsLoading,
    modelTypeOptions,
    providerOptions,
    showAddModelForm,
    showEditModelForm,
    newModelForm,
    editForm,
    testingConnection,
    connectionStatus,
    testingEditConnection,
    editConnectionStatus,

    // Methods
    fetchModels,
    testConnection,
    testConnectionEdit,
    addModel,
    cancelAddModel,
    deleteModel,
    openEditDialog,
    updateModel,
    cancelEditModel,
  }
}