package webcontroller

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"strings"

	"fornaxian.tech/log"
	"fornaxian.tech/nova_server/api"
	"fornaxian.tech/pixeldrain_api_client/pixelapi"
	"fornaxian.tech/util"
	"github.com/julienschmidt/httprouter"
)

func (wc *WebController) serveDirectory(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	var td = wc.newTemplateData(r)
	var pdapi = wc.api.RealIP(util.RemoteAddress(r)).RealAgent(r.UserAgent())

	// Prevent search engines from indexing this page for privacy reasons
	w.Header().Set("X-Robots-Tag", "noindex, nofollow")

	// The user and the node are embedded in the page so the JS doesn't have to
	// request them again. When a request fails the JS requests it again and
	// shows the error
	if apikey, err := wc.getAPIKey(r); err == nil {
		pdapi = pdapi.Login(apikey)
		_ = pdapi.GetJSON("user", &td.User)
	} else {
		td.User = json.RawMessage("null")
	}

	// A shared link can have the password of the directory in it
	var path = strings.TrimPrefix(p.ByName("path"), "/")
	var err = pdapi.GetJSON(
		"filesystem/"+url.PathEscape(path)+"?stat&password="+
			url.QueryEscape(r.URL.Query().Get("password")),
		&td.Node,
	)
	if apiErr, ok := errors.AsType[pixelapi.Error](err); ok {
		// Set the proper response code for the error message
		switch apiErr.StatusCode {
		case "not_found", "path_not_found":
			w.WriteHeader(http.StatusNotFound)
		case "forbidden", "permission_denied":
			w.WriteHeader(http.StatusForbidden)
		case "unavailable_for_legal_reasons":
			w.WriteHeader(http.StatusUnavailableForLegalReasons)
		case "authentication_required":
			http.Redirect(w, r, "/login", http.StatusSeeOther)
			return
		}
	} else if err != nil {
		log.Error("Failed to get path: %s", err)
		w.WriteHeader(http.StatusInternalServerError)
	} else {
		var node api.FilesystemPath
		if err = json.Unmarshal(td.Node, &node); err != nil {
			panic(fmt.Errorf("decode filesystem path: %w", err))
		}
		td.Title = fmt.Sprintf("%s ~ Nova", node.Path[node.BaseIndex].Name)
		td.OGData = wc.metadataFromFilesystem(r, node)
	}

	wc.renderPage(w, r, td)
}