export const useApi = () => {
  const config = useRuntimeConfig()
  const router = useRouter()
  const { toast } = useToast()
  const { isLoggedIn, logout } = useAuth()

  // Use current domain for API calls (same subdomain routing)
  const getApiBaseUrl = () => {
    if (import.meta.client) {
      // In browser, use current hostname but with port 3000 for API
      const currentHost = window.location.hostname
      const protocol = window.location.protocol
      return `${protocol}//${currentHost}:3000`
    }
    // Fallback for SSR
    return config.public.apiBaseUrl
  }

  const getHeaders = () => {
    const headers: Record<string, string> = {
      'Content-Type': 'application/json',
    }

    // Add tenant ID from localStorage or state
    if (import.meta.client) {
      const tenantId = localStorage.getItem('tenantId')
      if (tenantId) {
        headers['x-tenant-id'] = tenantId
      }

      const token = localStorage.getItem('token')
      if (token) {
        headers['Authorization'] = `Bearer ${token}`
      }
    }

    return headers
  }

  const handleResponse = async (response: Response) => {
    if (response.status === 401) {
      // Unauthorized - not authenticated
      if (import.meta.client) {
        logout()
        toast.error('Your session has expired. Please login again.')
        router.push('/login')
      }
      throw new Error('Unauthorized')
    }

    if (response.status === 403) {
      // Forbidden - not authorized
      if (import.meta.client) {
        toast.error('You do not have permission to perform this action.')
        // Redirect to home if logged in, otherwise to login
        if (isLoggedIn()) {
          router.push('/')
        } else {
          router.push('/login')
        }
      }
      throw new Error('Forbidden')
    }

    if (!response.ok) {
      // Try to get error details from response
      const text = await response.text()
      console.error('API Error Response:', {
        status: response.status,
        statusText: response.statusText,
        body: text
      })
      
      let errorMessage = `HTTP error! status: ${response.status}`
      if (text) {
        try {
          const errorData = JSON.parse(text)
          errorMessage = errorData.message || errorData.error || errorMessage
        } catch (e) {
          // If not JSON, use the text directly if it's not too long
          if (text.length < 200) {
            errorMessage = text
          }
        }
      }
      
      throw new Error(errorMessage)
    }

    // Handle empty responses
    const text = await response.text()
    if (!text) {
      return {}
    }
    
    try {
      return JSON.parse(text)
    } catch (e) {
      console.error('Failed to parse JSON response:', text)
      throw new Error('Invalid JSON response from server')
    }
  }

  const api = {
    async get(path: string, options?: { params?: Record<string, any> }) {
      let url = `${getApiBaseUrl()}/api${path}`
      
      // Add query parameters if provided
      if (options?.params) {
        const searchParams = new URLSearchParams()
        Object.entries(options.params).forEach(([key, value]) => {
          if (value !== undefined && value !== null) {
            searchParams.append(key, String(value))
          }
        })
        const queryString = searchParams.toString()
        if (queryString) {
          url += `?${queryString}`
        }
      }
      
      const response = await fetch(url, {
        headers: getHeaders(),
      })
      return handleResponse(response)
    },

    async post(path: string, data: any) {
      const response = await fetch(`${getApiBaseUrl()}/api${path}`, {
        method: 'POST',
        headers: getHeaders(),
        body: JSON.stringify(data),
      })
      return handleResponse(response)
    },

    async put(path: string, data: any) {
      const response = await fetch(`${getApiBaseUrl()}/api${path}`, {
        method: 'PUT',
        headers: getHeaders(),
        body: JSON.stringify(data),
      })
      return handleResponse(response)
    },

    async patch(path: string, data: any) {
      const response = await fetch(`${getApiBaseUrl()}/api${path}`, {
        method: 'PATCH',
        headers: getHeaders(),
        body: JSON.stringify(data),
      })
      return handleResponse(response)
    },

    async delete(path: string) {
      const response = await fetch(`${getApiBaseUrl()}/api${path}`, {
        method: 'DELETE',
        headers: getHeaders(),
      })
      return handleResponse(response)
    },
  }

  return { api }
}