// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

//go:build ignore

package main

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"gopkg.in/ini.v1"
)

func main() {
	if len(os.Args) != 2 {
		println("usage: backport-locales <to-ref>")
		println("eg: backport-locales release/v1.19")
		os.Exit(1)
	}

	ini.PrettyFormat = false
	mustNoErr := func(err error) {
		if err != nil {
			panic(err)
		}
	}
	collectInis := func(ref string) map[string]*ini.File {
		inis := map[string]*ini.File{}
		err := filepath.WalkDir("options/locale", func(path string, d os.DirEntry, err error) error {
			if err != nil {
				return err
			}
			if d.IsDir() || !strings.HasSuffix(d.Name(), ".ini") {
				return nil
			}
			cfg, err := ini.LoadSources(ini.LoadOptions{
				IgnoreInlineComment:         true,
				UnescapeValueCommentSymbols: true,
			}, path)
			mustNoErr(err)
			inis[path] = cfg
			fmt.Printf("collecting: %s @ %s\n", path, ref)
			return nil
		})
		mustNoErr(err)
		return inis
	}

	// collect new locales from current working directory
	inisNew := collectInis("HEAD")

	// switch to the target ref, and collect the old locales
	cmd := exec.Command("git", "checkout", os.Args[1])
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	mustNoErr(cmd.Run())
	inisOld := collectInis(os.Args[1])

	// use old en-US as the base, and copy the new translations to the old locales
	enUsOld := inisOld["options/locale/locale_en-US.ini"]
	for path, iniOld := range inisOld {
		if iniOld == enUsOld {
			continue
		}
		iniNew := inisNew[path]
		if iniNew == nil {
			continue
		}
		for _, secEnUS := range enUsOld.Sections() {
			secOld := iniOld.Section(secEnUS.Name())
			secNew := iniNew.Section(secEnUS.Name())
			for _, keyEnUs := range secEnUS.Keys() {
				if secNew.HasKey(keyEnUs.Name()) {
					oldStr := secOld.Key(keyEnUs.Name()).String()
					newStr := secNew.Key(keyEnUs.Name()).String()
					// A bug: many of new translations with ";" are broken in Crowdin (due to last messy restoring)
					// As the broken strings are gradually fixed, this workaround check could be removed (in a few months?)
					if strings.Contains(oldStr, ";") && !strings.Contains(newStr, ";") {
						println("skip potential broken string", path, secEnUS.Name(), keyEnUs.Name())
						continue
					}
					secOld.Key(keyEnUs.Name()).SetValue(newStr)
				}
			}
		}
		mustNoErr(iniOld.SaveTo(path))
	}
}