fscan/Common/ProgressManager.go

package common

import (
	"fmt"
	"os"
	"sync"
	"time"

	"github.com/shadow1ng/fscan/common/i18n"
)

/*
ProgressManager.go - 固定底部进度条管理器

提供固定在终端底部的进度条显示，与正常输出内容分离。
使用终端控制码实现位置固定和内容保护。
*/

// ProgressManager 进度条管理器
type ProgressManager struct {
	mu               sync.RWMutex
	enabled          bool
	total            int64
	current          int64
	description      string
	startTime        time.Time
	isActive         bool
	terminalHeight   int
	reservedLines    int // 为进度条保留的行数
	lastContentLine  int // 最后一行内容的位置
	
	// 输出缓冲相关
	outputMutex      sync.Mutex
	pendingOutputs   []string
	needProgressRedraw bool
}

var (
	globalProgressManager *ProgressManager
	progressMutex         sync.Mutex
)

// GetProgressManager 获取全局进度条管理器
func GetProgressManager() *ProgressManager {
	progressMutex.Lock()
	defer progressMutex.Unlock()
	
	if globalProgressManager == nil {
		globalProgressManager = &ProgressManager{
			enabled:       true,
			reservedLines: 2, // 保留2行：进度条 + 空行
			terminalHeight: getTerminalHeight(),
		}
	}
	return globalProgressManager
}

// InitProgress 初始化进度条
func (pm *ProgressManager) InitProgress(total int64, description string) {
	if !ShowProgress || Silent {
		pm.enabled = false
		return
	}
	
	pm.mu.Lock()
	defer pm.mu.Unlock()
	
	pm.total = total
	pm.current = 0
	pm.description = description
	pm.startTime = time.Now()
	pm.isActive = true
	pm.enabled = true
	
	// 初始显示进度条
	pm.renderProgress()
}

// UpdateProgress 更新进度
func (pm *ProgressManager) UpdateProgress(increment int64) {
	if !pm.enabled || !pm.isActive {
		return
	}
	
	pm.mu.Lock()
	defer pm.mu.Unlock()
	
	pm.current += increment
	if pm.current > pm.total {
		pm.current = pm.total
	}
	
	pm.renderProgress()
}

// SetProgress 设置当前进度
func (pm *ProgressManager) SetProgress(current int64) {
	if !pm.enabled || !pm.isActive {
		return
	}
	
	pm.mu.Lock()
	defer pm.mu.Unlock()
	
	pm.current = current
	if pm.current > pm.total {
		pm.current = pm.total
	}
	
	pm.renderProgress()
}

// FinishProgress 完成进度条
func (pm *ProgressManager) FinishProgress() {
	if !pm.enabled || !pm.isActive {
		return
	}
	
	pm.mu.Lock()
	defer pm.mu.Unlock()
	
	pm.current = pm.total
	pm.renderProgress()
	
	// 显示完成信息
	pm.showCompletionInfo()
	
	// 清理进度条区域，恢复正常输出
	pm.clearProgressArea()
	pm.isActive = false
}

// reserveProgressSpace 为进度条保留底部空间
func (pm *ProgressManager) reserveProgressSpace() {
	if pm.terminalHeight <= 0 {
		return
	}
	
	// 移动到底部保留区域上方
	targetLine := pm.terminalHeight - pm.reservedLines
	fmt.Printf("\033[%d;1H", targetLine)
	
	// 在底部创建空行
	for i := 0; i < pm.reservedLines; i++ {
		fmt.Println()
	}
	
	// 回到内容输出位置
	fmt.Printf("\033[%d;1H", targetLine)
	pm.lastContentLine = targetLine - 1
}

// renderProgress 渲染进度条（使用锁避免输出冲突）
func (pm *ProgressManager) renderProgress() {
	pm.outputMutex.Lock()
	defer pm.outputMutex.Unlock()
	
	// 清除当前行并回到行首
	fmt.Print("\033[2K\r")
	
	pm.renderProgressUnsafe()
}

// generateProgressBar 生成进度条字符串
func (pm *ProgressManager) generateProgressBar() string {
	if pm.total == 0 {
		return fmt.Sprintf("%s: 等待中...", pm.description)
	}
	
	percentage := float64(pm.current) / float64(pm.total) * 100
	elapsed := time.Since(pm.startTime)
	
	// 计算预估剩余时间
	var eta string
	if pm.current > 0 {
		totalTime := elapsed * time.Duration(pm.total) / time.Duration(pm.current)
		remaining := totalTime - elapsed
		if remaining > 0 {
			eta = fmt.Sprintf(" ETA:%s", formatDuration(remaining))
		}
	}
	
	// 计算速度
	speed := float64(pm.current) / elapsed.Seconds()
	speedStr := ""
	if speed > 0 {
		speedStr = fmt.Sprintf(" (%.1f/s)", speed)
	}
	
	// 生成进度条
	barWidth := 30
	filled := int(percentage * float64(barWidth) / 100)
	bar := ""
	
	if NoColor {
		// 无颜色版本
		bar = "[" + 
			fmt.Sprintf("%s%s", 
				string(make([]rune, filled)), 
				string(make([]rune, barWidth-filled))) + 
			"]"
		for i := 0; i < filled; i++ {
			bar = bar[:i+1] + "=" + bar[i+2:]
		}
		for i := filled; i < barWidth; i++ {
			bar = bar[:i+1] + "-" + bar[i+2:]
		}
	} else {
		// 彩色版本
		bar = "|"
		for i := 0; i < barWidth; i++ {
			if i < filled {
				bar += "#"
			} else {
				bar += "."
			}
		}
		bar += "|"
	}
	
	return fmt.Sprintf("%s %6.1f%% %s (%d/%d)%s%s", 
		pm.description, percentage, bar, pm.current, pm.total, speedStr, eta)
}

// showCompletionInfo 显示完成信息
func (pm *ProgressManager) showCompletionInfo() {
	elapsed := time.Since(pm.startTime)
	
	// 换行并显示完成信息
	fmt.Print("\n")
	
	completionMsg := i18n.GetText("progress_scan_completed")
	if NoColor {
		fmt.Printf("[完成] %s %d/%d (耗时: %s)\n", 
			completionMsg, pm.total, pm.total, formatDuration(elapsed))
	} else {
		fmt.Printf("\033[32m[完成] %s %d/%d\033[0m \033[90m(耗时: %s)\033[0m\n", 
			completionMsg, pm.total, pm.total, formatDuration(elapsed))
	}
}

// clearProgressArea 清理进度条区域
func (pm *ProgressManager) clearProgressArea() {
	// 简单清除当前行
	fmt.Print("\033[2K\r")
}

// IsActive 检查进度条是否活跃
func (pm *ProgressManager) IsActive() bool {
	pm.mu.RLock()
	defer pm.mu.RUnlock()
	return pm.isActive && pm.enabled
}

// getTerminalHeight 获取终端高度
func getTerminalHeight() int {
	// 对于固定底部进度条，我们暂时禁用终端高度检测
	// 因为在不同终端环境中可能会有问题
	// 改为使用相对定位方式
	return 0 // 返回0表示使用简化模式
}

// formatDuration 格式化时间间隔
func formatDuration(d time.Duration) string {
	if d < time.Minute {
		return fmt.Sprintf("%.1fs", d.Seconds())
	} else if d < time.Hour {
		return fmt.Sprintf("%.1fm", d.Minutes())
	} else {
		return fmt.Sprintf("%.1fh", d.Hours())
	}
}

// 全局函数，方便其他模块调用
func InitProgressBar(total int64, description string) {
	GetProgressManager().InitProgress(total, description)
}

func UpdateProgressBar(increment int64) {
	GetProgressManager().UpdateProgress(increment)
}

func SetProgressBar(current int64) {
	GetProgressManager().SetProgress(current)
}

func FinishProgressBar() {
	GetProgressManager().FinishProgress()
}

func IsProgressActive() bool {
	return GetProgressManager().IsActive()
}

// =============================================================================
// 日志输出协调功能
// =============================================================================

// LogWithProgress 在进度条活跃时协调日志输出
func LogWithProgress(message string) {
	pm := GetProgressManager()
	if !pm.IsActive() {
		// 如果进度条不活跃，直接输出
		fmt.Println(message)
		return
	}
	
	pm.outputMutex.Lock()
	defer pm.outputMutex.Unlock()
	
	// 清除当前进度条
	fmt.Print("\033[2K\r")
	
	// 输出消息
	fmt.Println(message)
	
	// 重新绘制进度条
	pm.renderProgressUnsafe()
}

// renderProgressUnsafe 不加锁的进度条渲染（内部使用）
func (pm *ProgressManager) renderProgressUnsafe() {
	if !pm.enabled || !pm.isActive {
		return
	}
	
	// 生成进度条内容
	progressBar := pm.generateProgressBar()
	
	// 输出进度条（带颜色，如果启用）
	if NoColor {
		fmt.Print(progressBar)
	} else {
		fmt.Printf("\033[36m%s\033[0m", progressBar) // 青色
	}
	
	// 刷新输出
	os.Stdout.Sync()
}