package main

import (
	"github.com/fsnotify/fsnotify"
	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/swagger"
	"github.com/spf13/viper"
	"gofiber.study.skcks.cn/common/errorx"
	"gofiber.study.skcks.cn/common/response"
	"gofiber.study.skcks.cn/global"
	"gofiber.study.skcks.cn/logger"
	"os"
	"os/signal"

	_ "gofiber.study.skcks.cn/docs"
)

var log = logger.Logger()
var app *fiber.App

// @title GoFiber Study API
// @version 1.0
// @description 基于 Fiber 框架的 swagger
// @termsOfService http://swagger.io/terms/
// @contact.name Shikong
// @contact.email 919411476@qq.com
// @license.name Apache 2.0
// @license.url http://www.apache.org/licenses/LICENSE-2.0.html
// @BasePath /
func main() {
	viper.SetConfigName("config")
	viper.SetConfigType("yaml")
	viper.AddConfigPath(".")
	viper.AddConfigPath("./config")

	if err := viper.ReadInConfig(); err != nil {
		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
			log.Fatalf("未找到配置文件")
		} else {
			log.Fatalf("配置解析失败 %s", err)
		}
	}

	viper.WatchConfig()
	viper.OnConfigChange(func(in fsnotify.Event) {
		log.Infoln(in.Name)
		loadApp()
	})

	loadApp()

	quit := make(chan os.Signal)
	signal.Notify(quit, os.Interrupt)
	<-quit
	log.Infof("关闭服务")
}

func loadApp() {
	err := viper.Unmarshal(global.Config)
	if err != nil {
		log.Fatalf("配置文件解析失败: %s", err)
	}
	log.Infof("\n%#v", global.Config)

	if app != nil {
		_ = app.Shutdown()
	}

	app = createApp()
	if err := app.Listen(global.Config.Server.Addr); err != nil {
		log.Fatalf("致命错误: %s", err)
	}
}

func createApp() *fiber.App {
	app := fiber.New(fiber.Config{
		Prefork:       global.Config.Server.PreFork,
		CaseSensitive: global.Config.Server.CaseSensitive,
		StrictRouting: global.Config.Server.StrictRouting,
		ServerHeader:  global.Config.Server.ServerHeader,
		ErrorHandler: func(ctx *fiber.Ctx, err error) error {
			code := fiber.StatusInternalServerError

			if e, ok := err.(*fiber.Error); ok {
				code = e.Code
			}

			err = ctx.Status(code).JSON(errorx.NewDefaultError(err.Error()))
			if err != nil {
				return ctx.Status(fiber.StatusInternalServerError).SendString("Internal Server Error")
			}

			return nil
		},
	})

	swaggerHandler(app)
	helloWorld(app)
	errorHandler(app)

	app.Get("/routes", func(ctx *fiber.Ctx) error {
		return ctx.JSON(response.NewResponse(app.Stack()))
	})
	return app
}

// helloWorld
//
// @Summary      HelloWorld
// @Description  简单的 HelloWorld 示例
// @Tags         HelloWorld
// @Accept       json
// @Produce      json
// @Success      200  {object}  response.Response{data=string}
// @Failure	     default {object}  errorx.CodeErrorResponse
// @Router       / [get]
func helloWorld(app *fiber.App) {
	app.Get("/", func(c *fiber.Ctx) error {
		log.Infof("\n%s", c.Request().String())
		return c.JSON(response.NewResponse("Hello, World 👋!"))
	})
}

// errorHandler
//
// @Summary      错误处理
// @Description  错误信息示例
// @Tags         Error
// @Accept       json
// @Produce      json
// @Failure	     default {object}  errorx.CodeErrorResponse
// @Router       /error [get]
// @Router       /error [post]
// @Router       /error [put]
// @Router       /error [delete]
// @Router       /error [patch]
// @Router       /error [head]
func errorHandler(app *fiber.App) {
	app.All("/error", func(ctx *fiber.Ctx) error {
		return ctx.JSON(errorx.NewDefaultError("错误信息示例"))
	})
}

func swaggerHandler(app *fiber.App) {
	app.Get("/swagger/*", swagger.New(swagger.Config{
		DeepLinking: false,
		// Expand ("list") or Collapse ("none") tag groups by default
		DocExpansion: "list",
	}))
}