package main

import (
	"context"
	"fmt"
	"os"
	"strings"

	"github.com/hxclaw/hxclaw/cmd/hxclaw/internal"
	"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() {
	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 := fmt.Sprintf("%s You: ", Logo)

	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(fmt.Sprintf("%s You: ", Logo))
		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 尝试使用流式输出，如果 Provider 不支持则回退到普通模式
func runWithStreaming(agentLoop *agent.AgentLoop, input, sessionKey string) {
	agentInstance := agentLoop.GetRegistry().GetDefaultAgent()
	if agentInstance == nil {
		fmt.Println("错误：无法获取 Agent 实例")
		return
	}

	provider := agentInstance.Provider
	ctx := context.Background()

	// 判断是否支持流式
	if sp, ok := provider.(providers.StreamingProvider); ok {
		// 从 session 中获取历史消息
		history := agentInstance.Sessions.GetHistory(sessionKey)
		summary := agentInstance.Sessions.GetSummary(sessionKey)

		// 使用 ContextBuilder 构建消息，包含历史
		messages := agentInstance.ContextBuilder.BuildMessages(
			history,
			summary,
			input,
			nil,   // media
			"cli", // channel
			sessionKey,
			"", // senderID
			"", // senderDisplayName
		)

		// 获取工具定义
		toolDefs := agentInstance.Tools.ToProviderDefs()

		// 启动 spinner，显示 "思考中..."
		spinner := internal.NewSpinner("思考中...")
		spinner.Start()

		fmt.Print("\n")
		var result strings.Builder
		var printedLen int
		firstToken := true
		_, err := sp.ChatStream(ctx, messages, toolDefs, agentInstance.Model, nil, func(accumulated string) {
			// 检测到第一个 token 时，停止 spinner
			if firstToken && len(accumulated) > 0 {
				spinner.Stop()
				firstToken = false
			}
			if len(accumulated) > printedLen {
				fmt.Print(accumulated[printedLen:])
				os.Stdout.Sync()
				result.WriteString(accumulated[printedLen:])
				printedLen = len(accumulated)
			}
		})

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

		fmt.Println()
		fmt.Println()

		// 将用户消息和回复保存到 session
		if result.Len() > 0 {
			agentInstance.Sessions.AddMessage(sessionKey, "user", input)
			agentInstance.Sessions.AddMessage(sessionKey, "assistant", result.String())
		}
	} else {
		// 回退到普通模式
		response, err := agentLoop.ProcessDirect(ctx, input, sessionKey)
		if err != nil {
			fmt.Printf("错误: %v\n", err)
			return
		}
		fmt.Printf("\n%s %s\n\n", Logo, response)
	}
}