package main

import (
	"context"
	"log"

	"os"

	"github.com/gofiber/fiber/v2"

	"github.com/gofiber/template/html"

	"codeberg.org/gothub/gothub/pages"

	"github.com/gofiber/fiber/v2/middleware/cache"

	"time"

	"github.com/gofiber/fiber/v2/middleware/proxy"

	"github.com/gofiber/fiber/v2/middleware/compress"

	"github.com/gofiber/fiber/v2/middleware/recover"

	"github.com/gofiber/fiber/v2/middleware/limiter"

	"html/template"

	"github.com/carlmjohnson/requests"
)

func main() {
	engine := html.New("./views", ".html")

	engine.AddFunc(
		// add unescape function
		"unescape", func(s string) template.HTML {
			return template.HTML(s)
		},
	)

	app := fiber.New(fiber.Config{
		Views:   engine,
		Prefork: false,
		AppName: "GotHub",
		// fucked up way to fix rate limits
		EnableTrustedProxyCheck: true,
		TrustedProxies:          []string{"0.0.0.0/0"},
		ProxyHeader:             fiber.HeaderXForwardedFor,
		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).Render("error", fiber.Map{
				"error": err,
			})
			if err != nil {
				return ctx.Status(fiber.StatusInternalServerError).SendString("Internal Server Error")
			}

			return nil
		},
	})

	app.Use(cache.New(cache.Config{
		Expiration: 5 * time.Minute,
	}))

	app.Get("/", func(c *fiber.Ctx) error {
		return c.Render("index", fiber.Map{
			"host": c.Hostname(),
		})
	})

	app.Use(compress.New(compress.Config{
		Level: compress.LevelBestSpeed, // 1
	}))

	app.Use(recover.New())

	ratelimiter := limiter.New(limiter.Config{
		Max:        5,
		Expiration: 5 * time.Minute,
		LimitReached: func(c *fiber.Ctx) error {
			return c.Status(429).Render("ratelimit_gt", fiber.Map{
				"Title": "Rate limit exceeded",
			})
		},
	})

	app.Static("/css", "./public/css")
	app.Static("/fonts", "./public/fonts")
	app.Static("/robots.txt", "./public/robots.txt")
	app.Static("/favicon.ico", "./public/assets/favicon.ico")
	app.Static("/logo.svg", "./public/assets/logo.svg")
	app.Get("/explore", ratelimiter, pages.HandleExplore)
	app.Get("/:user", ratelimiter, pages.HandleUser)
	app.Get("/:user/:repo", ratelimiter, pages.HandleRepo)
	app.Get("/file/:user/:repo/:branch/:file", func(c *fiber.Ctx) error {
		var file string
		url := "https://raw.githubusercontent.com/" + c.Params("user") + "/" + c.Params("repo") + "/" + c.Params("branch") + "/" + c.Params("file")
		err := requests.
			URL(url).
			ToString(&file).
			Fetch(context.Background())
		if err != nil {
			return c.Status(404).Render("error", fiber.Map{
				"error": err,
			})
		}
		return c.Render("file", fiber.Map{
			"file":     file,
			"fullname": c.Params("user") + "/" + c.Params("repo"),
			"name":     c.Params("file"),
			"branch":   c.Params("branch"),
		})
	})
	app.Get("/avatar/:id", func(c *fiber.Ctx) error {
		url := "https://avatars.githubusercontent.com/u/" + c.Params("id") + "?v=4"
		if err := proxy.Do(c, url); err != nil {
			return err
		}
		// Remove Server header from response
		c.Response().Header.Del(fiber.HeaderServer)
		return nil
	})
	app.Get("/download/:user/:repo/:branch", ratelimiter, func(c *fiber.Ctx) error {
		url := "https://github.com/" + c.Params("user") + "/" + c.Params("repo") + "/archive/" + c.Params("branch") + ".zip"
		if err := proxy.Do(c, url); err != nil {
			return err
		}
		// Remove Server header from response
		c.Response().Header.Del(fiber.HeaderServer)
		return nil
	})
	app.Get("/raw/:user/:repo/:branch/:file", ratelimiter, func(c *fiber.Ctx) error {
		url := "https://raw.githubusercontent.com/" + c.Params("user") + "/" + c.Params("repo") + "/" + c.Params("branch") + "/" + c.Params("file")
		if err := proxy.Do(c, url); err != nil {
			return err
		}
		// Remove Server header from response
		c.Response().Header.Del(fiber.HeaderServer)
		return nil
	})
	val, ok := os.LookupEnv("GOTHUB_PORT")
	if !ok {
		val = "3000"
	} else {
		log.Println("Using port from env variable")
	}
	log.Fatal(app.Listen(":" + val))
}