package main

import (
	"context"
	"fmt"
	"math"
	"os"
	"strings"
	"time"

	"charm.land/lipgloss/v2"

	"github.com/hxclaw/hxclaw/cmd/hxclaw/internal"
	"github.com/muesli/termenv"
	"github.com/sipeed/picoclaw/pkg/agent"
	"github.com/sipeed/picoclaw/pkg/bus"
	"github.com/sipeed/picoclaw/pkg/logger"
	"github.com/sipeed/picoclaw/pkg/providers"
)

const Logo = "🦐"

func main() {
	if err := internal.LoadProjectConfig(); err != nil {
		fmt.Fprintf(os.Stderr, "错误：加载项目配置失败: %v\n", err)
		os.Exit(1)
	}

	logo := internal.GetProjectConfig().UI.Logo
	fmt.Printf("%s HxClaw - PicoClaw 增强版 CLI\n\n", logo)

	cfg, err := internal.LoadConfig()
	if err != nil {
		fmt.Fprintf(os.Stderr, "错误：加载配置失败: %v\n", err)
		os.Exit(1)
	}

	logger.ConfigureFromEnv()

	provider, modelID, err := providers.CreateProvider(cfg)
	if err != nil {
		fmt.Fprintf(os.Stderr, "错误：创建 Provider 失败: %v\n", err)
		os.Exit(1)
	}

	if modelID != "" {
		cfg.Agents.Defaults.ModelName = modelID
	}

	msgBus := bus.NewMessageBus()
	defer msgBus.Close()

	agentLoop := agent.NewAgentLoop(cfg, msgBus, provider)
	defer agentLoop.Close()

	startupInfo := agentLoop.GetStartupInfo()
	logger.InfoCF("hxclaw", "HxClaw 已初始化",
		map[string]any{
			"tools_count":      startupInfo["tools"].(map[string]any)["count"],
			"skills_total":     startupInfo["skills"].(map[string]any)["total"],
			"skills_available": startupInfo["skills"].(map[string]any)["available"],
		})

	fmt.Printf("%s Interactive mode (Ctrl+C to exit)\n\n", Logo)
	interactiveMode(agentLoop, "cli:default")
}

func interactiveMode(agentLoop *agent.AgentLoop, sessionKey string) {
	prompt := internal.GetProjectConfig().UI.UserPrefix

	rl, err := internal.NewReadline(prompt)
	if err != nil {
		fmt.Printf("初始化 readline 失败: %v\n", err)
		fmt.Println("回退到简单输入模式...")
		simpleInteractiveMode(agentLoop, sessionKey)
		return
	}
	defer rl.Close()

	for {
		line, err := rl.Readline()
		if err != nil {
			if err == internal.ErrInterrupt || err == internal.ErrEOF {
				fmt.Println("\n再见!")
				return
			}
			fmt.Printf("读取输入错误: %v\n", err)
			continue
		}

		input := line
		if input == "" {
			continue
		}

		if input == "exit" || input == "quit" {
			fmt.Println("再见!")
			return
		}

		runWithStreaming(agentLoop, input, sessionKey)
	}
}

func simpleInteractiveMode(agentLoop *agent.AgentLoop, sessionKey string) {
	reader := internal.NewSimpleReader()
	for {
		fmt.Print(internal.GetProjectConfig().UI.UserPrefix)
		line, err := reader.ReadString()
		if err != nil {
			if err == internal.ErrEOF {
				fmt.Println("\n再见!")
				return
			}
			fmt.Printf("读取输入错误: %v\n", err)
			continue
		}

		input := line
		if input == "" {
			continue
		}

		if input == "exit" || input == "quit" {
			fmt.Println("再见!")
			return
		}

		runWithStreaming(agentLoop, input, sessionKey)
	}
}

// runWithStreaming 使用 ProcessDirect 处理请求，支持工具调用和结果显示
func runWithStreaming(agentLoop *agent.AgentLoop, input, sessionKey string) {
	startTime := time.Now()

	spinner := internal.NewSpinner("思考中...")
	spinner.Start()

	resp, err := agentLoop.ProcessDirect(context.Background(), input, sessionKey)

	spinner.Stop()

	if err != nil {
		fmt.Printf("错误: %v\n", err)
		return
	}

	rendered := internal.RenderMarkdown(resp)
	clearSpinnerLine()
	outputLineByLine(rendered)

	elapsed := time.Since(startTime)
	printElapsed(elapsed)
}

func clearSpinnerLine() {
	output := termenv.DefaultOutput()
	output.ClearLine()
	fmt.Print("\r")
	os.Stdout.Sync()
}

func outputLineByLine(text string) {
	if text == "" {
		return
	}

	lines := strings.Split(text, "\n")
	totalLines := len(lines)

	cfg := internal.GetProjectConfig()
	lineDelay := time.Duration(cfg.Streaming.LineDelayMs) * time.Millisecond
	lastLineDelay := time.Duration(cfg.Streaming.LastLineDelayMs) * time.Millisecond

	for i, line := range lines {
		if line == "" {
			fmt.Println()
			continue
		}

		fmt.Println(line)

		if i < totalLines-1 {
			time.Sleep(lineDelay)
		} else {
			time.Sleep(lastLineDelay)
		}
	}

	fmt.Println()
}

var (
	iconStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#f0c75e"))
	textStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#2b2e32"))
)

func printElapsed(elapsed time.Duration) {
	elapsedSec := math.Round(elapsed.Seconds()*10) / 10
	elapsedStr := formatDuration(elapsedSec)

	icon := iconStyle.Render("▣  ")
	text := textStyle.Render(fmt.Sprintf("耗时: %s", elapsedStr))
	fmt.Printf("  %s%s\n\n", icon, text)
}

func formatTokens(n int) string {
	if n >= 1000 {
		return fmt.Sprintf("%.1fk", float64(n)/1000)
	}
	return fmt.Sprintf("%d", n)
}

func formatDuration(s float64) string {
	if s >= 60 {
		return fmt.Sprintf("%.1fm", s/60)
	}
	return fmt.Sprintf("%.1fs", s)
}