package main

import (
	"flag"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"strings"
)

type metadataRule struct{ path, pattern, version string }

// syncMetadata updates version fields only. Regenerating Wails build templates
// during a release used to overwrite customized platform packaging tasks.
func syncMetadata(root, version string) error {
	if !regexp.MustCompile(`^[0-9]+\.[0-9]+\.[0-9]+(?:-[A-Za-z0-9.-]+)?$`).MatchString(version) {
		return fmt.Errorf("invalid release version")
	}
	core := strings.SplitN(version, "-", 2)[0]
	rules := []metadataRule{
		{"build/windows/info.json", `("(?:file_version|product_version|FileVersion|ProductVersion)"\s*:\s*")[^"]*(")`, core},
		{"build/windows/wails.exe.manifest", `(<assemblyIdentity[^>]*version=")[^"]*(")`, core + ".0"},
		{"build/windows/nsis/wails_tools.nsh", `(!define INFO_PRODUCTVERSION ")[^"]*(")`, core},
		{"build/darwin/Info.plist", `(<key>CFBundle(?:ShortVersionString|Version)</key>\s*<string>)[^<]*(</string>)`, version},
		{"build/darwin/Info.dev.plist", `(<key>CFBundle(?:ShortVersionString|Version)</key>\s*<string>)[^<]*(</string>)`, version},
		{"build/linux/nfpm/nfpm.yaml", `(?m)(^version:\s*")[^"]*(")`, version},
	}
	updates := make(map[string][]byte)
	for _, rule := range rules {
		file := filepath.Join(root, filepath.FromSlash(rule.path))
		data, err := os.ReadFile(file)
		if err != nil {
			return err
		}
		pattern := regexp.MustCompile(rule.pattern)
		if !pattern.Match(data) {
			return fmt.Errorf("missing version field in %s", rule.path)
		}
		updates[file] = pattern.ReplaceAll(data, []byte("${1}"+rule.version+"${2}"))
	}
	for file, data := range updates {
		info, err := os.Stat(file)
		if err != nil {
			return err
		}
		if err = os.WriteFile(file, data, info.Mode().Perm()); err != nil {
			return err
		}
	}
	return nil
}

func runMetadata(args []string) {
	flags := flag.NewFlagSet("sync-metadata", flag.ExitOnError)
	root := flags.String("root", ".", "project root")
	_ = flags.Parse(args)
	version, err := readVersion(filepath.Join(*root, "build", "config.yml"))
	if err != nil {
		exitErr(err)
	}
	if err = syncMetadata(*root, version); err != nil {
		exitErr(err)
	}
}