package server

import (
	"embed"
	"errors"
	"io/fs"
	"net/http"
	"path/filepath"
	"pcgamedb/crawler"
	"pcgamedb/db"
	"pcgamedb/log"
	"pcgamedb/server/handler"
	"pcgamedb/server/middleware"
	"strconv"
	"strings"

	"github.com/gin-contrib/cors"
	"github.com/gin-contrib/multitemplate"
	"github.com/gin-gonic/gin"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.uber.org/zap"

	"pcgamedb/docs"

	swaggerfiles "github.com/swaggo/files"
	ginSwagger "github.com/swaggo/gin-swagger"
)

//go:embed templates templates/layouts static
var frontendFS embed.FS

func initRoute(app *gin.Engine) {
	app.Use(cors.New(cors.Config{
		AllowAllOrigins: true,
	}))

	initFrontend(app)
	initApi(app)
}

func initFrontend(app *gin.Engine) {
	// Load static files
	staticFs, err := fs.Sub(frontendFS, "static")
	if err != nil {
		log.Logger.Fatal("Error loading static files", zap.Error(err))
		return
	}
	app.StaticFS("/static", http.FS(staticFs))

	// Load templates
	// directly using templates app.LoadHTMLFiles() to load all templates leads to error
	// because use templates with same name in different html file will case overridden
	// so we need to load all templates manually and use multitemplate to render them
	r := multitemplate.NewRenderer()

	layoutFiles, err := frontendFS.ReadDir("templates/layouts")
	if err != nil {
		log.Logger.Fatal("Error loading layout templates", zap.Error(err))
		return
	}

	rootFiles, err := frontendFS.ReadDir("templates")
	if err != nil {
		log.Logger.Fatal("Error loading root templates", zap.Error(err))
		return
	}

	for _, rootFile := range rootFiles {
		if rootFile.IsDir() {
			continue
		}
		name := filepath.Base(rootFile.Name())
		templateFiles := []string{"templates/" + name}
		for _, layout := range layoutFiles {
			if !layout.IsDir() {
				templateFiles = append(templateFiles, "templates/layouts/"+layout.Name())
			}
		}
		r.AddFromFS(name, frontendFS, templateFiles...)
	}

	app.HTMLRender = r

	// Load routes
	app.GET("/", func(ctx *gin.Context) {
		monthTop, err := crawler.GetSteam250MonthTop50Cache()
		if err != nil {
			ctx.HTML(500, "500.html", err)
			return
		}
		mostPlayed, err := crawler.GetSteam250MostPlayedCache()
		if err != nil {
			ctx.HTML(500, "500.html", err)
			return
		}
		bestOfTheYear, err := crawler.GetSteam250BestOfTheYearCache()
		if err != nil {
			ctx.HTML(500, "500.html", err)
			return
		}
		ctx.HTML(200, "index.html", gin.H{
			"MonthTop":      monthTop,
			"MostPlayed":    mostPlayed,
			"BestOfTheYear": bestOfTheYear,
		})
	})

	app.GET("/game/:id", func(ctx *gin.Context) {
		idStr := ctx.Param("id")
		id, err := primitive.ObjectIDFromHex(idStr)
		if err != nil {
			ctx.HTML(400, "400.html", nil)
			return
		}
		info, err := db.GetGameInfoByID(id)
		if err != nil {
			ctx.HTML(500, "500.html", err)
			return
		}
		games, err := db.GetGameItemsByIDs(info.GameIDs)
		if err != nil {
			ctx.HTML(500, "500.html", err)
			return
		}
		info.Games = games
		ctx.HTML(200, "game.html", info)
	})

	app.GET("/search", func(ctx *gin.Context) {
		key := ctx.Query("key")
		page := ctx.Query("page")
		key = strings.TrimSpace(key)
		if len(key) < 2 {
			ctx.HTML(400, "400.html", errors.New("Search key should be at least 2 characters long"))
			return
		}
		if page == "" {
			page = "1"
		}
		pageInt, err := strconv.Atoi(page)
		if err != nil {
			ctx.HTML(400, "400.html", err)
			return
		}
		games, totalPage, err := db.SearchGameInfos(key, pageInt, 10)
		if err != nil {
			ctx.HTML(500, "500.html", err)
			return
		}
		res := gin.H{
			"Games":       games,
			"TotalPage":   totalPage,
			"CurrentPage": pageInt,
			"Key":         key,
		}
		if pageInt > 1 {
			res["PrevPage"] = pageInt - 1
		}
		if pageInt < totalPage {
			res["NextPage"] = pageInt + 1
		}
		ctx.HTML(200, "search.html", res)
	})
}

func initApi(app *gin.Engine) {
	apiGroup := app.Group("/api")

	GameInfoGroup := apiGroup.Group("/game")
	GameItemGroup := GameInfoGroup.Group("/raw")

	GameItemGroup.GET("/unorganized", handler.GetUnorganizedGameItemsHandler)
	GameItemGroup.POST("/organize", middleware.Auth(), handler.OrganizeGameItemHandler)
	GameItemGroup.GET("/id/:id", handler.GetGameItemByIDHanlder)
	GameItemGroup.GET("/name/:name", handler.GetGameItemByRawNameHandler)
	GameItemGroup.GET("/author/:author", handler.GetGameItemsByAuthorHandler)

	GameInfoGroup.GET("/search", handler.SearchGamesHandler)
	GameInfoGroup.GET("/name/:name", handler.GetGameInfosByNameHandler)
	GameInfoGroup.GET("/platform/:platform_type/:platform_id", handler.GetGameInfoByPlatformIDHandler)
	GameInfoGroup.GET("/id/:id", handler.GetGameInfoByIDHandler)
	GameInfoGroup.DELETE("/id/:id", middleware.Auth(), handler.DeleteGameInfoHandler)

	apiGroup.GET("/popular/:type", handler.GetPopularGameInfosHandler)
	apiGroup.GET("/healthcheck", handler.HealthCheckHandler)
	apiGroup.GET("/author", handler.GetAllAuthorsHandler)
	apiGroup.POST("/clean", middleware.Auth(), handler.CleanGameHandler)

	docs.SwaggerInfo.BasePath = "/api"
	apiGroup.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerfiles.Handler))
}