package web

import (
	"fmt"
	"net/url"

	"github.com/gofiber/fiber/v2"
	"github.com/samber/lo"
	"github.com/spf13/viper"
	"github.com/sujit-baniya/flash"
	"go.fifitido.net/ytdl-web/version"
	"go.fifitido.net/ytdl-web/ytdl"
	"go.fifitido.net/ytdl-web/ytdl/metadata"
	"golang.org/x/exp/slog"
)

type routes struct {
	ytdl ytdl.Ytdl
}

func (r *routes) Register(app *fiber.App) {
	app.Get("/", r.IndexHandler)
	app.Get("/download", r.DownloadHandler)
	app.Head("/download/proxy", r.DownloadProxyHandler)
	app.Get("/download/proxy", r.DownloadProxyHandler)
}

func (r *routes) IndexHandler(c *fiber.Ctx) error {
	return c.Render("views/index", fiber.Map{
		"BasePath":     viper.GetString("base_path"),
		"Flash":        flash.Get(c),
		"Version":      version.Version,
		"Build":        version.Build,
		"YtdlpVersion": r.ytdl.Version(),
	}, "views/layouts/main")
}

func (r *routes) DownloadHandler(c *fiber.Ctx) error {
	urlBytes, err := url.QueryUnescape(c.Query("url"))
	if err != nil {
		return flash.WithError(c, fiber.Map{
			"error":   true,
			"message": "Invalid URL",
		}).Redirect("/")
	}
	url := string(urlBytes)
	if len(url) < 1 {
		return flash.WithError(c, fiber.Map{
			"error":   true,
			"message": "Invalid URL",
		}).Redirect("/")
	}

	meta, err := r.ytdl.GetMetadata(url)
	if err != nil {
		return flash.WithError(c, fiber.Map{
			"error":   true,
			"message": "Could not find a video at that url, maybe try again?",
		}).Redirect("/")
	}

	return c.Render("views/download", fiber.Map{
		"BasePath":     viper.GetString("base_path"),
		"Url":          url,
		"Meta":         meta,
		"Videos":       GetVideos(meta),
		"Version":      version.Version,
		"Build":        version.Build,
		"YtdlpVersion": r.ytdl.Version,
	}, "views/layouts/main")
}

func (r *routes) DownloadProxyHandler(c *fiber.Ctx) error {
	urlBytes, err := url.QueryUnescape(c.Query("url"))
	if err != nil {
		slog.Error("Failed to decode url param", slog.String("error", err.Error()))
		return fiber.ErrBadRequest
	}
	url := string(urlBytes)
	if len(url) < 1 {
		return fiber.ErrBadRequest
	}

	formatId := c.Query("format")
	if len(formatId) < 1 {
		return fiber.ErrBadRequest
	}

	meta, err := r.ytdl.GetMetadata(url)
	if err != nil {
		slog.Error("Failed to get metadata", slog.String("error", err.Error()))
		return fiber.ErrInternalServerError
	}

	videos := GetVideos(meta)
	index := c.QueryInt("index")

	if index < 0 || index >= len(videos) {
		return fiber.ErrBadRequest
	}

	video := videos[index]
	format, ok := lo.Find(video.Formats, func(format metadata.Format) bool {
		return format.FormatID == formatId
	})
	if !ok {
		return fiber.ErrBadRequest
	}

	c.Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s-%s.%s\"", meta.ID, format.Resolution, format.Ext))
	if format.Filesize != nil {
		c.Set("Content-Length", fmt.Sprint(*format.Filesize))
	} else if format.FilesizeApprox != nil {
		c.Set("Content-Length", fmt.Sprint(*format.FilesizeApprox))
	}

	if len(videos) == 1 {
		index = -1
	}

	return r.ytdl.Download(c.Response().BodyWriter(), url, format.FormatID, index)
}