import type { TimeEntryInsert, CustomerInsert, ProjectInsert } from "@emberclone/shared"

const API_BASE = "/api"

async function request<T>(endpoint: string, options: RequestInit = {}): Promise<T> {
  const token = localStorage.getItem("auth_token")
  const headers = new Headers(options.headers)

  if (token) {
    headers.set("Authorization", `Bearer ${token}`)
  }

  if (!(options.body instanceof FormData)) {
    headers.set("Content-Type", "application/json")
  }

  const response = await fetch(`${API_BASE}${endpoint}`, {
    ...options,
    headers,
    credentials: "include"
  })

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({}))
    const err: any = new Error(errorData.message || `API Error: ${response.status}`)
    err.status = response.status
    throw err
  }

  return response.json()
}

export const api = {
  async login(email: string, password: string) {
    const data = await request<{ token: string }>("/auth/login", {
      method: "POST",
      body: JSON.stringify({ email, password })
    })
    if (data?.token) {
      localStorage.setItem("auth_token", data.token)
    }
    return data
  },

  async logout() {
    localStorage.removeItem("auth_token")
    return request("/auth/logout", { method: "POST" }).catch(() => {})
  },

  async getMe() {
    return request<{ id: string; email: string; name: string; role: "admin" | "user" }>("/auth/me")
  },

  async changePassword(data: { oldPassword: string; newPassword: string }) {
    return request("/auth/change-password", {
      method: "POST",
      body: JSON.stringify(data)
    })
  },

  async deleteAccount(password: string) {
    return request("/auth/delete-account", {
      method: "DELETE",
      body: JSON.stringify({ password })
    })
  },

  async forgotPassword(email: string) {
    return request("/auth/forgot-password", {
      method: "POST",
      body: JSON.stringify({ email })
    })
  },

  async resetPassword(token: string, password: string) {
    return request("/auth/reset-password", {
      method: "POST",
      body: JSON.stringify({ token, password })
    })
  },

  async updateProfile(data: { name: string }) {
    return request("/users/me", {
      method: "PATCH",
      body: JSON.stringify(data)
    })
  },

  async listTimeEntries(opts?: Record<string, string>) {
    const query = opts ? `?${new URLSearchParams(opts).toString()}` : ""
    return request<any[]>(`/time-entries${query}`)
  },

  async createTimeEntry(data: Partial<TimeEntryInsert>) {
    return request("/time-entries", {
      method: "POST",
      body: JSON.stringify(data)
    })
  },

  async deleteTimeEntry(id: string) {
    return request(`/time-entries/${id}`, {
      method: "DELETE"
    })
  },

  async bulkDeleteTimeEntries(ids: string[]) {
    return request("/time-entries/bulk-delete", {
      method: "POST",
      body: JSON.stringify({ ids })
    })
  },

  async getRunningTimeEntry() {
    try {
      return await request<any>("/time-entries/running")
    } catch (err: any) {
      if (err.status === 404) return null
      throw err
    }
  },

  async startTimeEntry(data: { description: string; projectId?: string }) {
    return request("/time-entries/start", {
      method: "POST",
      body: JSON.stringify(data)
    })
  },

  async stopTimeEntry(id: string) {
    return request(`/time-entries/${id}/stop`, {
      method: "POST"
    })
  },

  async importTimeEntriesCsv(file: File) {
    const formData = new FormData()
    formData.append("file", file)
    return request("/time-entries/import", {
      method: "POST",
      body: formData
    })
  },

  async listTimeEntryTemplates() {
    return request<any[]>("/time-entry-templates")
  },

  async createTimeEntryTemplate(data: any) {
    return request("/time-entry-templates", {
      method: "POST",
      body: JSON.stringify(data)
    })
  },

  async updateTimeEntryTemplate(id: string, data: any) {
    return request(`/time-entry-templates/${id}`, {
      method: "PATCH",
      body: JSON.stringify(data)
    })
  },

  async deleteTimeEntryTemplate(id: string) {
    return request(`/time-entry-templates/${id}`, {
      method: "DELETE"
    })
  },

  async listHolidays() {
    return request<any[]>("/holidays")
  },

  async createHoliday(data: { date: string; name: string }) {
    return request("/holidays", {
      method: "POST",
      body: JSON.stringify(data)
    })
  },

  async deleteHoliday(id: string) {
    return request(`/holidays/${id}`, {
      method: "DELETE"
    })
  }
}