package pages

import (
	"io"
	"mime"
	"net/http"
	"strings"

	"codeberg.org/rimgo/rimgo/utils"
)

func HandleMedia(w http.ResponseWriter, r *http.Request) error {
	w.Header().Set("Cache-Control", "public,max-age=31557600")
	w.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'self'; img-src 'self'")
	splitName := strings.SplitN(r.PathValue("component"), ".", 2)
	baseName, extension := splitName[0], splitName[1]
	if strings.HasPrefix(r.URL.Path, "/stack") {
		return handleMedia(w, r, "https://i.stack.imgur.com/"+strings.ReplaceAll(baseName, "stack/", "")+"."+extension)
	} else {
		return handleMedia(w, r, "https://i.imgur.com/"+baseName+"."+extension)
	}
}

func HandleUserCover(w http.ResponseWriter, r *http.Request) error {
	w.Header().Set("Cache-Control", "public,max-age=604800")
	w.Header().Set("Content-Security-Policy", "default-src 'none'")
	return handleMedia(w, r, "https://imgur.com/user/"+r.PathValue("userID")+"/cover?maxwidth=2560")
}

func HandleUserAvatar(w http.ResponseWriter, r *http.Request) error {
	w.Header().Set("Cache-Control", "public,max-age=604800")
	w.Header().Set("Content-Security-Policy", "default-src 'none'")
	return handleMedia(w, r, "https://imgur.com/user/"+r.PathValue("userID")+"/avatar")
}

func handleMedia(w http.ResponseWriter, r *http.Request, url string) error {
	utils.SetHeaders(w)
	path := r.URL.Path

	if utils.Config.ForceWebp &&
		!strings.HasSuffix(path, ".webp") &&
		r.Header.Get("Sec-Fetch-Dest") == "image" &&
		r.URL.Query().Get("no_webp") == "" &&
		utils.Accepts(r, "image/webp") &&
		!strings.HasPrefix(path, "/stack") {
		url = strings.ReplaceAll(url, ".png", ".webp")
		url = strings.ReplaceAll(url, ".jpg", ".webp")
		url = strings.ReplaceAll(url, ".jpeg", ".webp")
		filename := strings.TrimPrefix(path, "/")
		w.Header().Set("Content-Disposition", mime.FormatMediaType("attachment", map[string]string{"filename*": filename}))
	}

	queryStr := r.URL.Query().Encode()
	if strings.HasPrefix(path, "/stack") && queryStr != "" {
		url = url + "?" + queryStr
	}

	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return err
	}

	utils.SetReqHeaders(req)

	rng := r.URL.Query().Get("Range")
	if rng != "" {
		req.Header.Set("Range", rng)
	}

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return err
	}

	if res.StatusCode == 404 || strings.Contains(res.Request.URL.String(), "error/404") {
		return RenderError(w, r, 404)
	} else if res.StatusCode == 429 {
		return RenderError(w, r, 429)
	}

	w.Header().Set("Accept-Ranges", "bytes")
	w.Header().Set("Content-Type", res.Header.Get("Content-Type"))
	w.Header().Set("Content-Length", res.Header.Get("Content-Length"))
	if res.Header.Get("Content-Range") != "" {
		w.Header().Set("Content-Range", res.Header.Get("Content-Range"))
	}

	_, err = io.Copy(w, res.Body)
	return err
}