package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"go.temporal.io/sdk/client"
	"go.temporal.io/sdk/worker"
	"github.com/rockliang/poimen/workflows/action"
	"github.com/rockliang/poimen/workflows/internal/config"
	"github.com/rockliang/poimen/workflows/internal/health"
	"github.com/rockliang/poimen/workflows/statemachine"
)

func main() {
	// Load configuration
	cfg, err := config.LoadConfig()
	if err != nil {
		log.Fatalf("failed to load config: %v", err)
	}

	// Connect to Temporal
	c, err := client.Dial(client.Options{
		HostPort:  cfg.Temporal.HostPort,
		Namespace: cfg.Temporal.Namespace,
	})
	if err != nil {
		log.Fatalf("failed to connect to temporal: %v", err)
	}
	defer c.Close()

	// Create worker
	w := worker.New(c, "poimen-taskqueue", worker.Options{})
	if w == nil {
		log.Fatalf("failed to create worker")
	}

	// Register all workflows
	w.RegisterWorkflow(statemachine.OrchestratorWorkflow)
	w.RegisterWorkflow(statemachine.TaskUnitWorkflow)
	w.RegisterWorkflow(statemachine.TestWorkflow)

	// Register all activities
	w.RegisterActivity(action.CloneRepoActivity)
	w.RegisterActivity(action.GitWorktreeAddActivity)
	w.RegisterActivity(action.GitCommitActivity)
	w.RegisterActivity(action.GitPushActivity)
	w.RegisterActivity(action.GitSquashMergeActivity)
	w.RegisterActivity(action.GitDiffActivity)
	w.RegisterActivity(action.PrepareSkillsActivity)
	w.RegisterActivity(action.PlanningActivity)
	w.RegisterActivity(action.ImplementerActivity)
	w.RegisterActivity(action.JudgeActivity)
	// Integration and lessons activities - register when fully tested
	// w.RegisterActivity(action.RunIntegrationTestActivity)
	// w.RegisterActivity(action.UpdateLessonsActivity)
	// w.RegisterActivity(action.ReadLessonsActivity)

	// Initialize health checker
	healthChecker := health.NewChecker(c)
	healthHandler := health.NewHandler(healthChecker)

	// Set up HTTP server for health checks
	mux := http.NewServeMux()
	healthHandler.RegisterRoutes(mux)

	healthServer := &http.Server{
		Addr:    ":8081",
		Handler: mux,
	}

	// Start health check server in a goroutine
	go func() {
		log.Printf("Health check server listening on %s", healthServer.Addr)
		if err := healthServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Printf("health check server error: %v", err)
		}
	}()

	// Set up signal handling for graceful shutdown
	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

	// Run worker in a goroutine
	workerErrChan := make(chan error, 1)
	go func() {
		fmt.Println("Starting worker on queue 'poimen-taskqueue'...")
		if err := w.Run(worker.InterruptCh()); err != nil {
			workerErrChan <- err
		}
	}()

	// Wait for either worker error or signal
	select {
	case err := <-workerErrChan:
		log.Fatalf("worker failed: %v", err)
	case sig := <-sigChan:
		log.Printf("received signal: %v, shutting down gracefully", sig)
		w.Stop()

		// Shutdown health check server
		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer cancel()
		if err := healthServer.Shutdown(ctx); err != nil {
			log.Printf("health check server shutdown error: %v", err)
		}
	}
}