//go:build ignore

package main

import (
	"io/fs"
	"log"
	"os"
	"path/filepath"
	"strings"
)

const (
	sourceDir      = "assets/testdata/api_tmpl"
	targetDir      = "assets/embedded"
	oldModuleName  = "github.com/FernandoJVideira/api_tmpl"
	moduleTemplate = "{{ .ModuleName }}"
)

func main() {
	log.Println("Syncing templates...")
	syncTemplates()
}

func syncTemplates() {

	err := filepath.WalkDir(sourceDir, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}

		relPath, _ := filepath.Rel(sourceDir, path)
		destPath := filepath.Join(targetDir, relPath)

		if strings.HasPrefix(d.Name(), ".") && d.Name() != "." {
			if d.IsDir() {
				return filepath.SkipDir
			}
			return nil
		}

		if d.IsDir() {
			return os.MkdirAll(destPath, 0755)
		}

		content, err := os.ReadFile(path)
		if err != nil {
			return err
		}

		if d.Name() == "go.mod" || d.Name() == "go.sum" {
			destPath += ".tmpl"
		}

		if d.Name() == "go.mod" {
			strContent := string(content)
			strContent = strings.Replace(strContent, oldModuleName, moduleTemplate, 1)
			content = []byte(strContent)
		}

		return os.WriteFile(destPath, content, 0644)
	})

	if err != nil {
		log.Fatalf("Error walking source: %v", err)
	}

	log.Println("Templates synced successfully!")
}