"use server"
import { cookies, headers } from "next/headers"
import { redirect } from "next/navigation"
import { cache } from "react"
import {
  API_BASE_URL,
  type ApiResponse,
  CLIENT_ID,
  CLIENT_SECRET,
} from "@/lib/api"

// ======================
// public
// ======================

async function callPublic<R = undefined>(
  endpoint: string,
  data?: unknown,
): Promise<ApiResponse<R>> {
  return _callPublic(endpoint, data ? JSON.stringify(data) : undefined)
}

const _callPublic = cache(
  async <R = undefined>(
    endpoint: string,
    data?: string,
  ): Promise<ApiResponse<R>> => {
    return call(`${API_BASE_URL}${endpoint}`, data)
  },
)

// ======================
// device
// ======================

async function callByDevice<R = undefined>(
  endpoint: string,
  data: unknown,
): Promise<ApiResponse<R>> {
  return _callByDevice(endpoint, data ? JSON.stringify(data) : undefined)
}

const _callByDevice = cache(
  async <R = undefined>(
    endpoint: string,
    data?: string,
  ): Promise<ApiResponse<R>> => {
    // 获取设备令牌
    if (!CLIENT_ID || !CLIENT_SECRET) {
      return {
        success: false,
        status: 401,
        message: "未配置 CLIENT_ID 或 CLIENT_SECRET",
      }
    }
    const token = Buffer.from(`${CLIENT_ID}:${CLIENT_SECRET}`).toString(
      "base64url",
    )

    // 发起请求
    return call(`${API_BASE_URL}${endpoint}`, data, `Basic ${token}`)
  },
)

// ======================
// user
// ======================

async function callByUser<R = undefined>(
  endpoint: string,
  data?: unknown,
): Promise<ApiResponse<R>> {
  return _callByUser(endpoint, data ? JSON.stringify(data) : undefined)
}

const _callByUser = cache(
  async <R = undefined>(
    endpoint: string,
    data?: string,
  ): Promise<ApiResponse<R>> => {
    // 获取用户令牌
    const cookie = await cookies()
    const token = cookie.get("admin/auth_token")?.value
    if (!token) {
      return {
        success: false,
        status: 401,
        message: "会话已失效",
      }
    }

    // 发起请求
    return await call<R>(`${API_BASE_URL}${endpoint}`, data, `Bearer ${token}`)
  },
)

// ======================
// call
// ======================

async function call<R = undefined>(
  url: string,
  body: RequestInit["body"],
  auth?: string,
): Promise<ApiResponse<R>> {
  let response: Response
  try {
    const reqHeaders = await headers()
    const reqIP = reqHeaders.get("x-forwarded-for")
    const reqUA = reqHeaders.get("user-agent")
    const callHeaders: RequestInit["headers"] = {
      "Content-Type": "application/json",
    }
    if (auth) callHeaders["Authorization"] = auth
    if (reqIP) callHeaders["X-Forwarded-For"] = reqIP
    if (reqUA) callHeaders["User-Agent"] = reqUA

    response = await fetch(url, {
      method: "POST",
      headers: callHeaders,
      body,
    })
  } catch (e) {
    console.error("后端请求失败", url, (e as Error).message)
    throw new Error(`请求失败，网络错误`)
  }

  const type = response.headers.get("Content-Type") ?? "text/plain"
  if (type.indexOf("text/plain") !== -1) {
    const text = await response.text()
    if (!response.ok) {
      console.log("后端请求失败", url, `status=${response.status}`, text)
      return {
        success: false,
        status: response.status,
        message: text || "请求失败",
      }
    }

    if (text?.trim()?.length) {
      console.log("未处理的响应成功", `type=text`, `text=${text}`)
    }
    return {
      success: true,
      data: undefined as R, // 强转类型，考虑优化
    }
  } else if (type.indexOf("application/json") !== -1) {
    const json = await response.json()
    if (!response.ok) {
      console.log("后端请求失败", url, `status=${response.status}`, json)

      return {
        success: false,
        status: response.status,
        message: json.message || json.error_description || "请求失败", // 业务错误（message）或者 oauth 错误（error_description）
      }
    }
    return {
      success: true,
      data: json,
    }
  }

  throw new Error(`无法解析响应数据，未处理的 Content-Type: ${type}`)
}

async function postCall<R = undefined>(rawResp: Promise<ApiResponse<R>>) {
  const header = await headers()
  const pathname = header.get("x-pathname") || "/"
  const resp = await rawResp

  // 重定向到登录页
  const match = [/^\/admin.*/].some(item => item.test(pathname))

  if (match && !resp.success && resp.status === 401) {
    console.log("🚗🚗🚗🚗🚗 非正常重定向 🚗🚗🚗🚗🚗")
    redirect("/login?force=true")
  }

  return resp
}

// 导出
export { callPublic, callByDevice, callByUser }