// Copyright 2024 Woodpecker Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"fmt"
	"net/http"
	"net/http/httputil"
	"net/url"
	"time"

	"github.com/urfave/cli/v3"

	"go.woodpecker-ci.org/woodpecker/v3/server/router"
	"go.woodpecker-ci.org/woodpecker/v3/server/router/middleware"
	"go.woodpecker-ci.org/woodpecker/v3/server/store"
	"go.woodpecker-ci.org/woodpecker/v3/server/web"
)

func getHTTPHandler(c *cli.Command, _store store.Store) (http.Handler, error) {
	proxyWebUI := c.String("www-proxy")
	var webUIServe func(w http.ResponseWriter, r *http.Request)

	if proxyWebUI == "" {
		webEngine, err := web.New()
		if err != nil {
			return nil, fmt.Errorf("failed to create webEngine: %w", err)
		}
		webUIServe = webEngine.ServeHTTP
	} else {
		origin, _ := url.Parse(proxyWebUI)

		director := func(req *http.Request) {
			req.Header.Add("X-Forwarded-Host", req.Host)
			req.Header.Add("X-Origin-Host", origin.Host)
			req.URL.Scheme = origin.Scheme
			req.URL.Host = origin.Host
		}

		proxy := &httputil.ReverseProxy{Director: director}
		webUIServe = proxy.ServeHTTP
	}

	// setup the server and start the listener
	handler := router.Load(
		webUIServe,
		middleware.Logger(time.RFC3339, true),
		middleware.Version,
		middleware.Store(_store),
	)

	return handler, nil
}