/*
 * GML - Go QML
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Roland Singer <roland.singer[at]desertbit.com>
 * Copyright (c) 2019 Sebastian Borchers <sebastian[at]desertbit.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package build

import (
	"os"
	"path/filepath"
	"strings"
	"text/template"
)

var qmlResTmpl = template.Must(template.New("t").Parse(qmlResData))

func prepareResources(ctx *Context) (err error) {
	// Create the resources file.
	f, err := os.Create(ctx.QMLResFile)
	if err != nil {
		return
	}
	defer func() {
		derr := f.Close()
		if derr != nil && err == nil {
			err = derr
		}
	}()

	files := make([]string, 0)

	// Define a walk func used to walk over all files in our qml and resources dirs.
	walkFunc := func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// Ignore any hidden files or directories.
		if strings.HasPrefix(info.Name(), ".") {
			if info.IsDir() {
				return filepath.SkipDir
			}
			return nil
		}

		// Add any file that we encounter to the resources, but relative to our
		// directory where the .qrc file lies within.
		if !info.IsDir() {
			files = append(files, strings.TrimPrefix(path, ctx.SourceDir+"/"))
		}

		return nil
	}

	// Scan first the qml directory and add all files found within
	// to our resources file.
	err = filepath.Walk(ctx.QMLDir, walkFunc)
	if err != nil {
		return
	}

	// Do the same for the resources directory.
	err = filepath.Walk(ctx.QMLResDir, walkFunc)
	if err != nil {
		return
	}

	// Write the contents of our template with the paths to the file.
	return qmlResTmpl.Execute(f, files)
}

const qmlResData = `<!-- This file is auto-generated by gml. -->
<!DOCTYPE RCC><RCC version="1.0">
<qresource prefix="/">
{{- range .}}
    <file>{{.}}</file>
{{- end}}
</qresource>
</RCC>`