//go:build ignore

package main

import (
	"bufio"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"
)

type Platform struct {
	OS   string
	Arch string
	Name string
	Ext  string
}

var platforms = []Platform{
	{"windows", "amd64", "Windows x86-64", ".exe"},
	{"linux", "amd64", "Linux x86-64", ""},
	{"linux", "arm64", "Linux ARM64", ""},
	{"linux", "arm", "Linux ARMv7l", ""},
}

const (
	BuildTime = "2026-07-29"
	Binary    = "frpc-console"
)

// ============================================================
// 版本管理核心
// ============================================================

// readVersion 读取仓库根目录的 VERSION.ini 文件
// Preview 格式: "2.4"
// LTS 格式: "2.5 20260729"
func readVersion() (semver string, ltsDate string) {
	data, err := os.ReadFile("./VERSION.ini")
	if err != nil {
		return "0.0.0", ""
	}
	// 去掉注释行（以 ; 或 # 开头）
	lines := strings.Split(string(data), "\n")
	var content string
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line == "" || strings.HasPrefix(line, ";") || strings.HasPrefix(line, "#") {
			continue
		}
		content = line
		break
	}
	parts := strings.Fields(content)
	if len(parts) < 1 {
		return "0.0.0", ""
	}
	semver = parts[0]
	if len(parts) > 1 {
		ltsDate = parts[1]
	}
	return semver, ltsDate
}

// getVersionType 判断版本类型
// 规则: X.0 或 X.5 → LTS，其他 → Preview
func getVersionType(semver string) string {
	parts := strings.Split(semver, ".")
	if len(parts) < 2 {
		return "preview"
	}
	minor := parts[1]
	if minor == "0" || minor == "5" {
		return "lts"
	}
	return "preview"
}

// getFullVersion 生成完整版本字符串
// LTS (X.0/X.5): {semver}-lts-{ltsDate}  (必须有日期)
// Preview (其他): {semver}-preview-{buildTimestamp}
func getFullVersion() string {
	semver, ltsDate := readVersion()
	vType := getVersionType(semver)

	switch vType {
	case "lts":
		if ltsDate == "" {
			ltsDate = time.Now().Format("20060102")
		}
		return semver + "-lts-" + ltsDate
	default:
		timestamp := time.Now().Format("20060102-150405")
		return semver + "-preview-" + timestamp
	}
}

// getImageTag 生成镜像标签
// LTS: {semver}-lts-{ltsDate}
// Preview: preview-{buildTimestamp}
func getImageTag() string {
	semver, ltsDate := readVersion()
	vType := getVersionType(semver)

	switch vType {
	case "lts":
		if ltsDate == "" {
			ltsDate = time.Now().Format("20060102")
		}
		return semver + "-lts-" + ltsDate
	default:
		return "preview-" + time.Now().Format("20060102-150405")
	}
}

func main() {
	if len(os.Args) > 1 {
		target := os.Args[1]
		switch target {
		case "all":
			buildAll()
			return
		case "clean":
			clean()
			return
		case "list":
			listPlatforms()
			return
		case "version":
			fmt.Println(getFullVersion())
			return
		case "image-tag":
			fmt.Println(getImageTag())
			return
		}
		for _, p := range platforms {
			if target == p.OS+"/"+p.Arch {
				build(p, false)
				return
			}
		}
		fmt.Println("❌ 不支持的平台:", target)
		fmt.Println("   可用: windows/amd64, linux/amd64, linux/arm64, linux/arm")
		fmt.Println("   或: all, list, clean, version, image-tag")
		return
	}
	interactiveMenu()
}

// ============================================================
// 构建函数
// ============================================================

func listPlatforms() {
	fmt.Println("可用平台:")
	for i, p := range platforms {
		fmt.Printf("  %d. %s (%s/%s)\n", i+1, p.Name, p.OS, p.Arch)
	}
}

func interactiveMenu() {
	fmt.Println("========================================")
	fmt.Println("  frpc-console 多平台构建工具")
	fmt.Println("========================================")
	fmt.Println()
	fmt.Println("  当前版本:", getFullVersion())
	fmt.Println("  镜像标签:", getImageTag())
	fmt.Println()

	for i, p := range platforms {
		fmt.Printf("  %d. %s (%s/%s)\n", i+1, p.Name, p.OS, p.Arch)
	}
	fmt.Println("  a. 全部构建")
	fmt.Println("  c. 清理构建产物")
	fmt.Println("  v. 显示版本信息")
	fmt.Println("  q. 退出")
	fmt.Println()

	reader := bufio.NewReader(os.Stdin)
	fmt.Print("请选择: ")

	input, _ := reader.ReadString('\n')
	input = strings.TrimSpace(strings.ToLower(input))

	switch input {
	case "q":
		fmt.Println("已退出")
		return
	case "c":
		clean()
		return
	case "a":
		buildAll()
		return
	case "v":
		fmt.Println("版本:", getFullVersion())
		fmt.Println("镜像标签:", getImageTag())
		return
	default:
		var idx int
		if n, err := fmt.Sscanf(input, "%d", &idx); n == 1 && err == nil && idx >= 1 && idx <= len(platforms) {
			build(platforms[idx-1], false)
			return
		}
		fmt.Println("❌ 无效选择")
		interactiveMenu()
	}
}

func buildAll() {
	for _, p := range platforms {
		build(p, true)
	}
	fmt.Println("\n✅ 全部构建完成！产物位于 build/ 目录")
}

func build(p Platform, silent bool) {
	if !silent {
		fmt.Printf("🔨 构建 %s (%s/%s)...\n", p.Name, p.OS, p.Arch)
	}

	outDir := "./build"
	if err := os.MkdirAll(outDir, 0755); err != nil {
		fmt.Printf("❌ 创建目录失败: %v\n", err)
		return
	}

	fullVersion := getFullVersion()
	imageTag := getImageTag()

	outName := Binary + "-" + p.OS + "-" + p.Arch
	if p.Arch == "arm" {
		outName += "v7"
	}
	outName += p.Ext
	outPath := filepath.Join(outDir, outName)

	cmd := exec.Command("go", "build",
		"-ldflags="+
			"-s -w "+
			"-X main.buildVersion="+fullVersion+" "+
			"-X main.buildImageTag="+imageTag+" "+
			"-X main.buildTime="+BuildTime,
		"-o", outPath,
		".",
	)
	cmd.Env = append(os.Environ(),
		"GOOS="+p.OS,
		"GOARCH="+p.Arch,
		"CGO_ENABLED=0",
	)

	if p.Arch == "arm" {
		cmd.Env = append(cmd.Env, "GOARM=7")
	}

	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	if err := cmd.Run(); err != nil {
		fmt.Printf("❌ 构建失败: %v\n", err)
		return
	}

	if !silent {
		fmt.Printf("✅ 构建完成: %s\n", outPath)
		fmt.Printf("   版本: %s\n", fullVersion)
		if info, err := os.Stat(outPath); err == nil {
			size := float64(info.Size()) / 1024 / 1024
			fmt.Printf("   📦 %.2f MB\n", size)
		}
	}

	if !silent {
		packageBinary(outPath, p)
	}
}

func packageBinary(binPath string, p Platform) {
	base := strings.TrimSuffix(filepath.Base(binPath), p.Ext)
	dir := filepath.Dir(binPath)

	if p.Ext == ".exe" {
		zipName := filepath.Join(dir, base+".zip")
		cmd := exec.Command("zip", "-j", zipName, binPath)
		if err := cmd.Run(); err == nil {
			fmt.Printf("   📦 已打包: %s\n", zipName)
		}
	} else {
		tarName := filepath.Join(dir, base+".tar.gz")
		cmd := exec.Command("tar", "-czf", tarName, "-C", dir, filepath.Base(binPath))
		if err := cmd.Run(); err == nil {
			fmt.Printf("   📦 已打包: %s\n", tarName)
		}
	}
}

func clean() {
	fmt.Println("🧹 清理构建产物...")
	if err := os.RemoveAll("./build"); err != nil {
		fmt.Printf("❌ 清理失败: %v\n", err)
		return
	}
	fmt.Println("✅ 清理完成")
}