// Copyright 2021 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 web

import (
	"encoding/json"
	"net/http"
	"text/template"

	"github.com/gin-gonic/gin"
	"github.com/rs/zerolog/log"

	"go.woodpecker-ci.org/woodpecker/v2/server"
	"go.woodpecker-ci.org/woodpecker/v2/server/router/middleware/session"
	"go.woodpecker-ci.org/woodpecker/v2/shared/token"
	"go.woodpecker-ci.org/woodpecker/v2/version"
)

func Config(c *gin.Context) {
	user := session.User(c)

	var csrf string
	if user != nil {
		csrf, _ = token.New(
			token.CsrfToken,
			user.Login,
		).Sign(user.Hash)
	}

	configData := map[string]any{
		"user":               user,
		"csrf":               csrf,
		"version":            version.String(),
		"skip_version_check": server.Config.WebUI.SkipVersionCheck,
		"forge":              server.Config.Services.Forge.Name(),
		"root_path":          server.Config.Server.RootPath,
		"enable_swagger":     server.Config.WebUI.EnableSwagger,
	}

	// default func map with json parser.
	funcMap := template.FuncMap{
		"json": func(v any) string {
			a, err := json.Marshal(v)
			if err != nil {
				log.Error().Err(err).Msgf("could not marshal JSON")
				return ""
			}
			return string(a)
		},
	}

	c.Header("Content-Type", "text/javascript; charset=utf-8")
	tmpl := template.Must(template.New("").Funcs(funcMap).Parse(configTemplate))

	if err := tmpl.Execute(c.Writer, configData); err != nil {
		log.Error().Err(err).Msgf("could not execute template")
		c.AbortWithStatus(http.StatusInternalServerError)
		return
	}

	c.Status(http.StatusOK)
}

const configTemplate = `
window.WOODPECKER_USER = {{ json .user }};
window.WOODPECKER_CSRF = "{{ .csrf }}";
window.WOODPECKER_VERSION = "{{ .version }}";
window.WOODPECKER_FORGE = "{{ .forge }}";
window.WOODPECKER_ROOT_PATH = "{{ .root_path }}";
window.WOODPECKER_ENABLE_SWAGGER = {{ .enable_swagger }};
window.WOODPECKER_SKIP_VERSION_CHECK = {{ .skip_version_check }}
`