package main

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"syscall"
	"time"

	"laodingbot/internal/agent"
	"laodingbot/internal/config"
	"laodingbot/internal/knowledge"
	"laodingbot/internal/llm"
	"laodingbot/internal/logger"
	"laodingbot/internal/memory"
	"laodingbot/internal/runtimews"
	"laodingbot/internal/toolhost"
	"laodingbot/internal/tools"
	"laodingbot/internal/transport/feishu"
	"laodingbot/internal/transport/telegram"
)

// main 是程序的入口点。它负责初始化环境、加载配置、注册工具并启动消息通道。
func main() {
	// 设置优雅监听上下文，接收中断和终止信号
	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	// 检查是否作为 Toolhost 的子进程运行
	isToolhostChild := len(os.Args) > 1 && os.Args[1] == "--toolhost"
	workspaceRoot, err := runtimews.PrepareFromEnv()
	if err != nil {
		panic(fmt.Sprintf("prepare runtime workspace failed: %v", err))
	}

	// 加载应用配置
	cfg, err := config.Load()
	if err != nil {
		panic(fmt.Sprintf("load config failed: %v", err))
	}

	// 如果是作为子进程运行，则启动工具宿主端
	if isToolhostChild {
		if err := toolhost.RunChild(ctx, cfg, nil); err != nil && ctx.Err() == nil {
			panic(fmt.Sprintf("toolhost child failed: %v", err))
		}
		return
	}

	// 初始化日志系统
	appLogger, err := logger.New(cfg.LogLevel)
	if err != nil {
		panic(fmt.Sprintf("init logger failed: %v", err))
	}
	appLogger = appLogger.WithComponent("main")
	appLogger.Infof("config loaded; channel=%s, log_level=%s workspace=%s", cfg.MessageChannel, cfg.LogLevel, workspaceRoot)

	// 初始化 SQLite 数据库存储层（例如记忆存储等）
	store, err := memory.NewSQLiteStore(cfg.SQLitePath, appLogger.WithComponent("memory"))
	if err != nil {
		appLogger.Errorf("init memory store failed: %v", err)
		panic(err)
	}
	defer store.Close()

	// 注册内部系统工具
	toolRegistry := tools.NewRegistry(appLogger.WithComponent("tools.registry"))
	exePath, err := os.Executable()
	if err != nil {
		appLogger.Errorf("resolve executable path failed: %v", err)
		panic(err)
	}

	// 初始化工具宿主客户端，以便运行独立进程内的工具
	tc, err := toolhost.NewClient(toolhost.ClientConfig{
		ExecutablePath:    exePath,
		Args:              []string{"--toolhost"},
		WorkDir:           ".",
		CallTimeout:       time.Duration(cfg.ToolCallTimeoutSec) * time.Second,
		HeartbeatInterval: 5 * time.Second,
		MaxConcurrency:    4,
	}, appLogger.WithComponent("toolhost.client"))
	if err != nil {
		appLogger.Errorf("init toolhost client failed: %v", err)
		panic(err)
	}
	defer tc.Close()

	// 获取支持的工具列表并将其注册
	listCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
	toolInfos, err := tc.ToolList(listCtx)
	cancel()
	if err != nil {
		appLogger.Errorf("toolhost list failed: %v", err)
		panic(err)
	}
	if len(toolInfos) == 0 {
		panic("toolhost returned empty tool list")
	}
	for _, info := range toolInfos {
		toolRegistry.Register(toolhost.NewRemoteTool(info.Name, info.Description, time.Duration(cfg.ToolCallTimeoutSec)*time.Second, tc))
	}

	// 加载 AI 角色的基础信息 (Soul)
	soul, err := knowledge.LoadSoul(cfg.SoulPath)
	if err != nil {
		appLogger.Errorf("load soul failed path=%s err=%v", cfg.SoulPath, err)
		panic(err)
	}
	// 加载所有可用技能
	skillSet, err := knowledge.LoadSkillSet(cfg.SkillsDir)
	if err != nil {
		appLogger.Errorf("load skill set failed dir=%s err=%v", cfg.SkillsDir, err)
		panic(err)
	}
	// 加载技能总结，用于后续路由和匹配
	skillSummaries, err := knowledge.LoadSkillSummaries(cfg.SkillsDir)
	if err != nil {
		appLogger.Errorf("load skill summaries failed dir=%s err=%v", cfg.SkillsDir, err)
		panic(err)
	}
	appLogger.Infof("knowledge loaded soul_path=%s skills_dir=%s", cfg.SoulPath, cfg.SkillsDir)

	// 实例化 LLM 客户端
	llmClient := llm.NewOpenAICompatibleClient(cfg.LLM, appLogger.WithComponent("llm"))

	// 创建编排器，整合 LLM、记忆系统、知识技能库与各种工具
	engine := agent.NewOrchestrator(
		llmClient,
		store,
		toolRegistry,
		soul,
		skillSet,
		skillSummaries,
		cfg.SkillsDir,
		cfg.ReactMaxSteps,
		cfg.EnableCapabilityGap,
		cfg.AutoSkillDir,
		cfg.GapDraftTriggerCount,
		time.Duration(cfg.GapClusterLookbackHours)*time.Hour,
		appLogger.WithComponent("agent"),
	)

	appLogger.Infof("LaodingBot started, channel=%s", cfg.MessageChannel)
	// 根据配置启动对应的信息通道
	if err := runMessageChannel(ctx, cfg, engine, appLogger); err != nil && ctx.Err() == nil {
		appLogger.Errorf("message channel run failed: %v", err)
		panic(err)
	}
	appLogger.Infof("LaodingBot stopped")
}

// runMessageChannel 负责初始化并运行配置指定的消息通道（如 telegram 或 feishu）。
func runMessageChannel(ctx context.Context, cfg config.Config, engine *agent.Orchestrator, lg *logger.Logger) error {
	switch cfg.MessageChannel {
	case "telegram":
		tg, err := telegram.NewBot(cfg.Telegram.Token, cfg.Telegram.PollTimeoutSeconds, lg.WithComponent("transport.telegram"))
		if err != nil {
			return fmt.Errorf("init telegram bot failed: %w", err)
		}
		lg.Infof("starting telegram transport")
		return tg.Run(ctx, func(ctx context.Context, msg telegram.IncomingMessage) (string, error) {
			return engine.HandleMessage(ctx, msg.ChatID, msg.UserID, msg.Text)
		})
	case "feishu":
		fs, err := feishu.NewBot(
			cfg.Feishu.AppID,
			cfg.Feishu.AppSecret,
			cfg.Feishu.VerifyToken,
			cfg.Feishu.ListenAddr,
			cfg.Feishu.EventPath,
			lg.WithComponent("transport.feishu"),
		)
		if err != nil {
			return fmt.Errorf("init feishu bot failed: %w", err)
		}
		lg.Infof("starting feishu transport")
		return fs.Run(ctx, func(ctx context.Context, msg feishu.IncomingMessage) (string, error) {
			if msg.MsgType == "file" && len(msg.FileBytes) > 0 {
				content := msg.FileBytes
				if msg.FilePath != "" {
					if b, err := os.ReadFile(msg.FilePath); err == nil && len(b) > 0 {
						content = b
					} else if lg != nil {
						lg.Warnf("read local file failed path=%s err=%v; fallback to in-memory bytes", msg.FilePath, err)
					}
				}
				files := []llm.InputFile{{
					FileName: msg.FileName,
					MimeType: msg.FileMime,
					Content:  content,
				}}
				// Feishu file event and user question are split into separate messages.
				// Use empty text so file IDs are cached and consumed by the next text query.
				return engine.HandleMessageWithFiles(ctx, msg.ChatID, msg.UserID, "", files)
			}
			return engine.HandleMessage(ctx, msg.ChatID, msg.UserID, msg.Text)
		})
	default:
		return fmt.Errorf("unsupported message channel: %s", cfg.MessageChannel)
	}
}