/*
cli.go - 命令行界面
实现了彩色的命令行用户界面
*/

package ui

import (
	"fmt"
	"os"
	"os/exec"
	"runtime"
	"strings"

	"../todo"
)

// CLI 命令行界面
type CLI struct {
	colors *Colors
}

// NewCLI 创建新的命令行界面
func NewCLI() *CLI {
	return &CLI{
		colors: NewColors(),
	}
}

// ShowWelcome 显示欢迎信息
func (c *CLI) ShowWelcome() {
	c.Clear()
	fmt.Println(c.colors.Cyan("=== 待办事项管理器 ==="))
	fmt.Println()
	fmt.Println("📝 一个简单而强大的待办事项管理工具")
	fmt.Println()
	c.ShowHelp()
}

// ShowHelp 显示帮助信息
func (c *CLI) ShowHelp() {
	fmt.Println(c.colors.Yellow("命令列表:"))
	fmt.Println("  " + c.colors.Green("add <任务>") + "        - 添加新任务")
	fmt.Println("  " + c.colors.Green("list [状态]") + "       - 显示任务列表 (all/done/pending)")
	fmt.Println("  " + c.colors.Green("done <ID>") + "        - 标记任务完成")
	fmt.Println("  " + c.colors.Green("delete <ID>") + "      - 删除任务")
	fmt.Println("  " + c.colors.Green("edit <ID> <新内容>") + " - 编辑任务")
	fmt.Println("  " + c.colors.Green("search <关键词>") + "   - 搜索任务")
	fmt.Println("  " + c.colors.Green("stats") + "            - 显示统计信息")
	fmt.Println("  " + c.colors.Green("clear") + "            - 清屏")
	fmt.Println("  " + c.colors.Green("help") + "             - 显示帮助")
	fmt.Println("  " + c.colors.Green("quit") + "             - 退出程序")
	fmt.Println()
}

// ShowTaskList 显示任务列表
func (c *CLI) ShowTaskList(tasks []todo.Task) {
	if len(tasks) == 0 {
		c.ShowInfo("暂无任务")
		return
	}

	fmt.Println(c.colors.Cyan("📋 待办事项列表:"))

	for _, task := range tasks {
		c.showTask(task)
	}
	fmt.Println()
}

// showTask 显示单个任务
func (c *CLI) showTask(task todo.Task) {
	var status, statusColor string
	if task.Completed {
		status = "✅"
		statusColor = "green"
	} else {
		status = "⏳"
		statusColor = "yellow"
	}

	// 根据优先级选择颜色
	var priorityColor string
	switch task.Priority {
	case todo.Urgent:
		priorityColor = "red"
	case todo.High:
		priorityColor = "magenta"
	case todo.Medium:
		priorityColor = "blue"
	case todo.Low:
		priorityColor = "cyan"
	default:
		priorityColor = "white"
	}

	// 格式化任务内容
	content := task.Content
	if len(content) > 50 {
		content = content[:47] + "..."
	}

	// 显示任务
	fmt.Printf("  [%s] %s %s %s\n",
		c.colors.Blue(fmt.Sprintf("%d", task.ID)),
		c.colorize(status, statusColor),
		c.colorize(content, "white"),
		c.colorize(fmt.Sprintf("(优先级: %s)", task.Priority), priorityColor))

	// 显示标签
	if len(task.Tags) > 0 {
		fmt.Printf("    %s %s\n",
			c.colors.Gray("标签:"),
			c.colors.Cyan(strings.Join(task.Tags, ", ")))
	}

	// 显示描述
	if task.Description != "" {
		desc := task.Description
		if len(desc) > 60 {
			desc = desc[:57] + "..."
		}
		fmt.Printf("    %s %s\n",
			c.colors.Gray("描述:"),
			c.colors.White(desc))
	}
}

// ShowStatistics 显示统计信息
func (c *CLI) ShowStatistics(stats todo.Statistics) {
	fmt.Println(c.colors.Cyan("📊 统计信息:"))
	fmt.Printf("  总任务数: %s\n", c.colors.Blue(fmt.Sprintf("%d", stats.Total)))
	fmt.Printf("  已完成: %s\n", c.colors.Green(fmt.Sprintf("%d", stats.Completed)))
	fmt.Printf("  待完成: %s\n", c.colors.Yellow(fmt.Sprintf("%d", stats.Pending)))
	fmt.Printf("  完成率: %s\n", c.colors.Magenta(fmt.Sprintf("%.1f%%", stats.CompletionRate)))

	if len(stats.ByPriority) > 0 {
		fmt.Println()
		fmt.Println(c.colors.Yellow("按优先级统计:"))
		for priority, count := range stats.ByPriority {
			var color string
			switch priority {
			case "紧急":
				color = "red"
			case "高":
				color = "magenta"
			case "中":
				color = "blue"
			case "低":
				color = "cyan"
			default:
				color = "white"
			}
			fmt.Printf("  %s: %s\n",
				c.colorize(priority, color),
				c.colors.White(fmt.Sprintf("%d", count)))
		}
	}

	if stats.AverageCompletionTime > 0 {
		fmt.Printf("\n  平均完成时间: %s\n",
			c.colors.Cyan(stats.AverageCompletionTime.String()))
	}

	fmt.Println()
}

// ShowSuccess 显示成功消息
func (c *CLI) ShowSuccess(message string) {
	fmt.Printf("%s %s\n", c.colors.Green("✅"), message)
}

// ShowError 显示错误消息
func (c *CLI) ShowError(message string) {
	fmt.Printf("%s %s\n", c.colors.Red("❌"), c.colors.Red(message))
}

// ShowWarning 显示警告消息
func (c *CLI) ShowWarning(message string) {
	fmt.Printf("%s %s\n", c.colors.Yellow("⚠️"), c.colors.Yellow(message))
}

// ShowInfo 显示信息消息
func (c *CLI) ShowInfo(message string) {
	fmt.Printf("%s %s\n", c.colors.Blue("ℹ️"), message)
}

// Clear 清屏
func (c *CLI) Clear() {
	var cmd *exec.Cmd
	switch runtime.GOOS {
	case "windows":
		cmd = exec.Command("cmd", "/c", "cls")
	default:
		cmd = exec.Command("clear")
	}
	cmd.Stdout = os.Stdout
	cmd.Run()
}

// colorize 根据颜色名称着色文本
func (c *CLI) colorize(text, color string) string {
	switch strings.ToLower(color) {
	case "red":
		return c.colors.Red(text)
	case "green":
		return c.colors.Green(text)
	case "yellow":
		return c.colors.Yellow(text)
	case "blue":
		return c.colors.Blue(text)
	case "magenta":
		return c.colors.Magenta(text)
	case "cyan":
		return c.colors.Cyan(text)
	case "white":
		return c.colors.White(text)
	case "gray":
		return c.colors.Gray(text)
	default:
		return text
	}
}

// ShowTaskDetail 显示任务详细信息
func (c *CLI) ShowTaskDetail(task todo.Task) {
	fmt.Println(c.colors.Cyan("📋 任务详情:"))
	fmt.Println(c.colors.Gray("─────────────────────────────────────"))

	fmt.Printf("ID: %s\n", c.colors.Blue(fmt.Sprintf("%d", task.ID)))
	fmt.Printf("内容: %s\n", c.colors.White(task.Content))

	if task.Completed {
		fmt.Printf("状态: %s\n", c.colors.Green("✅ 已完成"))
	} else {
		fmt.Printf("状态: %s\n", c.colors.Yellow("⏳ 待完成"))
	}

	var priorityColor string
	switch task.Priority {
	case todo.Urgent:
		priorityColor = "red"
	case todo.High:
		priorityColor = "magenta"
	case todo.Medium:
		priorityColor = "blue"
	case todo.Low:
		priorityColor = "cyan"
	}
	fmt.Printf("优先级: %s\n", c.colorize(task.Priority.String(), priorityColor))

	fmt.Printf("创建时间: %s\n", c.colors.Gray(task.CreatedAt.Format("2006-01-02 15:04:05")))
	fmt.Printf("更新时间: %s\n", c.colors.Gray(task.UpdatedAt.Format("2006-01-02 15:04:05")))

	if task.Completed && task.CompletedAt != nil {
		fmt.Printf("完成时间: %s\n", c.colors.Green(task.CompletedAt.Format("2006-01-02 15:04:05")))
		fmt.Printf("完成耗时: %s\n", c.colors.Cyan(task.CompletionTime().String()))
	}

	if task.Description != "" {
		fmt.Printf("描述: %s\n", c.colors.White(task.Description))
	}

	if len(task.Tags) > 0 {
		fmt.Printf("标签: %s\n", c.colors.Cyan(strings.Join(task.Tags, ", ")))
	}

	fmt.Println(c.colors.Gray("─────────────────────────────────────"))
	fmt.Println()
}

// ShowProgress 显示进度条
func (c *CLI) ShowProgress(current, total int, label string) {
	if total == 0 {
		return
	}

	percentage := float64(current) / float64(total) * 100
	barLength := 30
	filledLength := int(float64(barLength) * float64(current) / float64(total))

	bar := strings.Repeat("█", filledLength) + strings.Repeat("░", barLength-filledLength)

	fmt.Printf("\r%s [%s] %.1f%% (%d/%d)",
		label,
		c.colors.Green(bar),
		percentage,
		current,
		total)
}

// ConfirmAction 确认操作
func (c *CLI) ConfirmAction(message string) bool {
	fmt.Printf("%s %s (y/N): ", c.colors.Yellow("❓"), message)

	var response string
	fmt.Scanln(&response)

	response = strings.ToLower(strings.TrimSpace(response))
	return response == "y" || response == "yes"
}

// ShowBanner 显示横幅
func (c *CLI) ShowBanner(text string) {
	length := len(text) + 4
	border := strings.Repeat("=", length)

	fmt.Println(c.colors.Cyan(border))
	fmt.Printf("%s %s %s\n",
		c.colors.Cyan("="),
		c.colors.White(text),
		c.colors.Cyan("="))
	fmt.Println(c.colors.Cyan(border))
	fmt.Println()
}