// Package main provides the entry point for the rdev API server.
package main

import (
	"context"
	"log/slog"
	"os"
	"time"

	"github.com/orchard9/rdev/internal/adapter/cloudflare"
	"github.com/orchard9/rdev/internal/adapter/cockroach"
	"github.com/orchard9/rdev/internal/adapter/codeagent"
	"github.com/orchard9/rdev/internal/adapter/codeagent/claudecode"
	"github.com/orchard9/rdev/internal/adapter/codeagent/opencode"
	"github.com/orchard9/rdev/internal/adapter/deployer"
	"github.com/orchard9/rdev/internal/adapter/gitea"
	"github.com/orchard9/rdev/internal/adapter/kubernetes"
	"github.com/orchard9/rdev/internal/adapter/memory"
	"github.com/orchard9/rdev/internal/adapter/postgres"
	redisadapter "github.com/orchard9/rdev/internal/adapter/redis"
	"github.com/orchard9/rdev/internal/adapter/templates"
	"github.com/orchard9/rdev/internal/adapter/woodpecker"
	"github.com/orchard9/rdev/internal/auth"
	"github.com/orchard9/rdev/internal/db"
	"github.com/orchard9/rdev/internal/envutil"
	"github.com/orchard9/rdev/internal/handlers"
	"github.com/orchard9/rdev/internal/metrics"
	"github.com/orchard9/rdev/internal/middleware"
	"github.com/orchard9/rdev/internal/port"
	"github.com/orchard9/rdev/internal/service"
	"github.com/orchard9/rdev/internal/telemetry"
	"github.com/orchard9/rdev/internal/webhook"
	"github.com/orchard9/rdev/internal/worker"
	"github.com/orchard9/rdev/pkg/api"
)

// version is set via ldflags at build time: -ldflags="-X main.version=v0.8.0"
var version = "dev"

func main() {
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
		Level: slog.LevelInfo,
	}))

	// Initialize telemetry (OpenTelemetry)
	telCfg := telemetry.DefaultConfig()
	telCfg.Logger = logger
	tel, err := telemetry.New(context.Background(), telCfg)
	if err != nil {
		logger.Error("failed to initialize telemetry", "error", err)
		os.Exit(1)
	}

	// Load configuration from environment
	cfg := loadConfig()

	// Validate required security configuration
	if cfg.CredentialEncryptionKey == "" {
		logger.Warn("CREDENTIAL_ENCRYPTION_KEY not set - credential store will use insecure default",
			"hint", "Generate with: openssl rand -base64 32")
		// Use a deterministic fallback for development only
		cfg.CredentialEncryptionKey = "rdev-dev-key-not-for-production"
	}

	// Initialize database with auto-migrations
	database, err := db.New(db.Config{
		Host:     cfg.DBHost,
		Port:     cfg.DBPort,
		User:     cfg.DBUser,
		Password: cfg.DBPassword,
		Database: cfg.DBName,
		SSLMode:  cfg.DBSSLMode,
	}, logger)
	if err != nil {
		logger.Error("failed to connect to database", "error", err)
		os.Exit(1)
	}
	defer func() { _ = database.Close() }()

	// Initialize auth service (hexagonal: repo → service → auth wrapper)
	apiKeyRepo := postgres.NewAPIKeyRepository(database.DB)
	apiKeySvc := service.NewAPIKeyService(apiKeyRepo, cfg.AdminKey)
	authService := auth.NewService(apiKeySvc, cfg.AdminKey)

	// Initialize credential store (for infrastructure secrets)
	credentialStore := postgres.NewCredentialStore(database.DB, cfg.CredentialEncryptionKey)

	// Load infrastructure config from credential store (falls back to env vars)
	infraCfg := loadInfraConfig(context.Background(), credentialStore, cfg, logger)

	// Create adapters (dependency injection)
	namespace := envutil.GetEnv("K8S_NAMESPACE", "rdev")

	// Initialize K8s client (falls back gracefully if unavailable)
	k8sClient := kubernetes.NewClientOrNil(kubernetes.ClientConfig{
		Namespace:  namespace,
		Kubeconfig: os.Getenv("KUBECONFIG"),
	})
	projectRepo := kubernetes.NewProjectRepositoryWithClient(namespace, k8sClient, logger)
	k8sExecutor := kubernetes.NewExecutor(namespace)
	streamPub := memory.NewStreamPublisher()
	if k8sClient != nil {
		if err := projectRepo.StartWatching(context.Background()); err != nil {
			logger.Warn("failed to start project watcher", "error", err)
		}
	}

	auditLogger := postgres.NewAuditLogger(database.DB)
	rateLimiter := postgres.NewRateLimiter(database.DB)
	stopRateLimitCleanup := rateLimiter.StartCleanupWorker(context.Background(), 5*time.Minute)
	commandQueue := postgres.NewCommandQueueRepository(database.DB)
	workQueueRepo := postgres.NewWorkQueueRepository(database.DB)

	webhookRepo := postgres.NewWebhookRepository(database.DB)
	webhookDispatcher := webhook.NewDispatcher(webhookRepo, &webhook.DispatcherConfig{
		WorkerCount:  10,
		MaxRetries:   3,
		Timeout:      30 * time.Second,
		RetryBackoff: 5 * time.Second,
		Logger:       logger,
	})
	if err := webhookDispatcher.Start(); err != nil {
		logger.Error("failed to start webhook dispatcher", "error", err)
		os.Exit(1)
	}

	// Infrastructure adapters (optional - only if configured)
	var giteaClient *gitea.Client
	if infraCfg.GiteaToken != "" && infraCfg.GiteaURL != "" {
		var err error
		giteaClient, err = gitea.NewClient(infraCfg.GiteaURL, infraCfg.GiteaToken, infraCfg.GiteaDefaultOrg)
		if err != nil {
			logger.Warn("failed to initialize gitea client", "error", err)
		}
	}
	var dnsClient *cloudflare.Client
	if infraCfg.CloudflareToken != "" && infraCfg.CloudflareZoneID != "" {
		dnsClient = cloudflare.NewClient(infraCfg.CloudflareToken, infraCfg.CloudflareZoneID, infraCfg.DefaultDomain)
	}

	var deployerAdapter *deployer.Deployer
	if k8sClient != nil {
		deployerAdapter = deployer.NewDeployer(k8sClient, deployer.Config{
			Namespace:       infraCfg.DeployNamespace,
			IngressClass:    "traefik",
			TLSIssuer:       infraCfg.DeployTLSIssuer,
			DefaultDomain:   infraCfg.DefaultDomain,
			DefaultReplicas: 1,
		})
	}
	var woodpeckerClient *woodpecker.Client
	if infraCfg.WoodpeckerURL != "" && infraCfg.WoodpeckerAPIToken != "" {
		var err error
		woodpeckerClient, err = woodpecker.NewClient(infraCfg.WoodpeckerURL, infraCfg.WoodpeckerAPIToken, woodpecker.WithLogger(logger))
		if err != nil {
			logger.Warn("failed to initialize woodpecker client", "error", err)
		}
	}
	var templateProvider *templates.Provider
	if infraCfg.GiteaToken != "" && infraCfg.GiteaURL != "" {
		templateProvider = templates.NewProvider(infraCfg.GiteaURL, infraCfg.GiteaToken, logger)
	}

	// Initialize database provisioner (optional - for project database isolation)
	var dbProvisioner port.DatabaseProvisioner
	if infraCfg.CRDBHost != "" {
		var err error
		dbProvisioner, err = cockroach.NewProvisioner(cockroach.Config{
			Host:    infraCfg.CRDBHost,
			Port:    infraCfg.CRDBPort,
			User:    infraCfg.CRDBUser,
			SSLMode: infraCfg.CRDBSSLMode,
		}, logger)
		if err != nil {
			logger.Warn("failed to initialize cockroachdb provisioner", "error", err)
		} else {
			logger.Info("cockroachdb provisioner initialized", "host", infraCfg.CRDBHost)
		}
	}

	// Initialize cache provisioner (optional - for project cache isolation via Redis ACLs)
	var cacheProvisioner port.CacheProvisioner
	if infraCfg.RedisHost != "" && infraCfg.RedisPassword != "" {
		var err error
		cacheProvisioner, err = redisadapter.NewProvisioner(redisadapter.Config{
			Host:     infraCfg.RedisHost,
			Port:     infraCfg.RedisPort,
			Password: infraCfg.RedisPassword,
		}, logger)
		if err != nil {
			logger.Warn("failed to initialize redis provisioner", "error", err)
		} else {
			logger.Info("redis provisioner initialized", "host", infraCfg.RedisHost)
		}
	}

	// Initialize CodeAgent registry (multi-provider support)
	agentRegistry := codeagent.NewRegistry()

	// Register Claude Code adapter (default - always available)
	claudeCodeAdapter := claudecode.NewAdapter(namespace)
	agentRegistry.Register(claudeCodeAdapter)
	logger.Info("registered Claude Code agent", "provider", claudeCodeAdapter.Provider())

	// Register OpenCode adapter (optional - only if configured)
	if cfg.OpenCodeURL != "" {
		openCodeAdapter := opencode.NewAdapter(opencode.ClientConfig{
			BaseURL:  cfg.OpenCodeURL,
			Username: cfg.OpenCodeUsername,
			Password: cfg.OpenCodePassword,
			Timeout:  30 * time.Second,
		})
		agentRegistry.Register(openCodeAdapter)
		logger.Info("registered OpenCode agent", "provider", openCodeAdapter.Provider(), "url", cfg.OpenCodeURL)
	}

	// Create services
	projectService := service.NewProjectService(projectRepo, k8sExecutor, streamPub).
		WithAuditLogger(auditLogger).
		WithCommandQueue(commandQueue).
		WithWebhookDispatcher(webhookDispatcher).
		WithCodeAgentRegistry(agentRegistry)

	// Create work service (for worker pool task management)
	workService := service.NewWorkService(workQueueRepo, service.WorkServiceConfig{
		Logger: logger,
	}).WithWebhookDispatcher(webhookDispatcher)

	// Initialize operation tracking (for debugging project failures)
	operationRepo := postgres.NewOperationRepository(database.DB)
	operationService := service.NewOperationService(operationRepo, logger)

	// Initialize worker pool infrastructure
	workerRegistryRepo := postgres.NewWorkerRegistryRepository(database.DB)
	buildAuditRepo := postgres.NewBuildAuditRepository(database.DB)

	// Create worker service (manages worker lifecycle and task assignment)
	workerService := service.NewWorkerService(workerRegistryRepo, workQueueRepo, logger).
		WithBuildAudit(buildAuditRepo)

	// Create build service (orchestrates build submission and tracking)
	buildService := service.NewBuildService(workQueueRepo, buildAuditRepo, logger)

	// SDLC lifecycle management (kubectl exec into project pods)
	sdlcExec := kubernetes.NewSDLCExecutor(kubernetes.SDLCExecutorConfig{Namespace: namespace, Logger: logger})
	sdlcService := service.NewSDLCService(sdlcExec, projectRepo, service.SDLCServiceConfig{Logger: logger})

	// Pod git operations (shared between build executor and SDLC orchestrator)
	var podGitOps *worker.PodGitOperations
	if infraCfg.GiteaToken != "" {
		podGitOps = worker.NewPodGitOperations(worker.PodGitOperationsConfig{
			Namespace:  "rdev",
			GiteaToken: infraCfg.GiteaToken,
			Logger:     logger,
		})
	}

	// SDLC orchestrator (execute/resolve/commit via agents and git)
	var gitCommitter service.PodGitCommitter
	if podGitOps != nil {
		gitCommitter = &podGitCommitterAdapter{podGitOps: podGitOps}
	}
	sdlcOrchestrator := service.NewSDLCOrchestratorService(
		sdlcService,
		agentRegistry,
		gitCommitter,
		projectRepo,
		service.SDLCOrchestratorConfig{Logger: logger},
	)

	// Create app
	app := api.New("rdev-api",
		api.WithPort(cfg.Port),
		api.WithLogger(logger),
	)

	// Add telemetry middleware (first to capture all requests)
	app.Use(telemetry.Middleware(telCfg.ServiceName))

	// Add metrics middleware (before auth to track all requests)
	app.Use(metrics.Middleware)

	// Add auth middleware (skips /health, /ready, /docs, /openapi.json, /metrics)
	app.Use(auth.Middleware(authService))

	// Add rate limiting middleware (after auth, so we have API key context)
	rateLimitCfg := middleware.DefaultRateLimitConfig()
	rateLimitCfg.Limiter = rateLimiter
	app.Use(middleware.RateLimitMiddleware(rateLimitCfg))

	// Register metrics endpoint (no auth required)
	app.Router().Handle("/metrics", metrics.Handler())

	// Initialize handlers
	projectsHandler := handlers.NewProjectsHandlerWithService(projectService)
	keysHandler := handlers.NewKeysHandler(authService)
	claudeConfigHandler := handlers.NewClaudeConfigHandlerWithService(projectService, projectRepo, k8sExecutor)
	auditHandler := handlers.NewAuditHandler(auditLogger)
	queueHandler := handlers.NewQueueHandler(commandQueue, projectRepo)
	webhookHandler := handlers.NewWebhookHandler(webhookRepo, projectRepo)
	workHandler := handlers.NewWorkHandler(workService)

	// Initialize domain and slug repositories
	projectDomainRepo := postgres.NewProjectDomainRepository(database.DB)
	slugGenerator := postgres.NewSlugRepository(database.DB)

	// Initialize project infrastructure service (orchestrates full project lifecycle)
	projectInfraService := service.NewProjectInfraService(
		database.DB,
		giteaClient,
		dnsClient,
		deployerAdapter,
		woodpeckerClient, // CI provider for auto-activating repos
		templateProvider, // Template provider for seeding repos
		projectDomainRepo,
		slugGenerator,
		service.ProjectInfraConfig{
			DefaultGitOwner: infraCfg.GiteaDefaultOrg,
			DefaultDomain:   infraCfg.DefaultDomain,
			ClusterIP:       infraCfg.ClusterIP,
			Logger:          logger,
		},
	)
	// Wire optional database and cache provisioners
	if dbProvisioner != nil {
		projectInfraService = projectInfraService.WithDatabaseProvisioner(dbProvisioner)
	}
	if cacheProvisioner != nil {
		projectInfraService = projectInfraService.WithCacheProvisioner(cacheProvisioner)
	}

	// Create domain service adapter for infrastructure handler
	domainServiceAdapter := handlers.NewDomainServiceAdapter(projectInfraService)

	// Initialize infrastructure handler (for threesix.ai git/deploy/dns/ci)
	infraHandler := handlers.NewInfrastructureHandler(
		giteaClient,
		dnsClient,
		deployerAdapter,
		projectRepo,
		woodpeckerClient,
		domainServiceAdapter,
		handlers.InfrastructureConfig{
			DefaultGitOwner: infraCfg.GiteaDefaultOrg,
			DefaultDomain:   infraCfg.DefaultDomain,
			ClusterIP:       infraCfg.ClusterIP,
		},
	)

	// Initialize project management handler
	projectMgmtHandler := handlers.NewProjectManagementHandler(projectInfraService, logger).
		SetOperationService(operationService)

	// Initialize component service and handler (for monorepo component management)
	var componentsHandler *handlers.ComponentsHandler
	if infraCfg.GiteaToken != "" && infraCfg.GiteaURL != "" && templateProvider != nil {
		bulkFileClient := gitea.NewBulkFileClient(infraCfg.GiteaURL, infraCfg.GiteaToken)
		componentService := service.NewComponentService(
			database.DB,
			templateProvider,
			bulkFileClient,
			deployerAdapter, // Creates initial K8s deployment for new components
			service.ComponentServiceConfig{
				DefaultGitOwner: infraCfg.GiteaDefaultOrg,
				RegistryURL:     infraCfg.RegistryURL,
				Logger:          logger,
			},
		)
		componentsHandler = handlers.NewComponentsHandler(componentService, logger).
			SetOperationService(operationService)
		logger.Info("component service initialized")
	}

	// Initialize Woodpecker webhook handler (for CI/CD auto-deploy)
	woodpeckerHandler := handlers.NewWoodpeckerWebhookHandler(
		deployerAdapter,
		dnsClient,
		handlers.WoodpeckerWebhookConfig{
			WebhookSecret: infraCfg.WoodpeckerWebhookSecret,
			DefaultDomain: infraCfg.DefaultDomain,
			RegistryURL:   infraCfg.RegistryURL,
			ClusterIP:     infraCfg.ClusterIP,
			Logger:        logger,
		},
	).SetOperationService(operationService)

	// Initialize credentials handler (superadmin only)
	credentialsHandler := handlers.NewCredentialsHandler(credentialStore)

	// Initialize agents handler (for code agent management)
	agentsHandler := handlers.NewAgentsHandler(agentRegistry)

	// Initialize worker pool handlers
	workersHandler := handlers.NewWorkersHandler(workerService)
	buildsHandler := handlers.NewBuildsHandler(buildService)
	createAndBuildHandler := handlers.NewCreateAndBuildHandler(projectInfraService, buildService, logger)

	sdlcHandler := handlers.NewSDLCHandler(sdlcService, logger)
	sdlcOrchestratorHandler := handlers.NewSDLCOrchestratorHandler(sdlcOrchestrator, logger)

	// Initialize operations handler (for debugging project failures)
	operationsHandler := handlers.NewOperationsHandler(operationRepo)

	// Override default health/ready endpoints with full dependency checks
	healthHandler := handlers.NewHealthHandler("rdev-api", database.DB, nil).
		WithAgentRegistry(agentRegistry)

	app.Router().Get("/health", healthHandler.Health)
	app.Router().Get("/ready", healthHandler.Ready)

	// Register routes
	projectsHandler.Mount(app.Router())
	keysHandler.Mount(app.Router())
	claudeConfigHandler.Mount(app.Router())
	auditHandler.Mount(app.Router())
	queueHandler.Mount(app.Router())
	webhookHandler.Mount(app.Router())
	workHandler.Mount(app.Router())
	infraHandler.Mount(app.Router())
	projectMgmtHandler.Mount(app.Router())
	if componentsHandler != nil {
		componentsHandler.Mount(app.Router())
	}
	woodpeckerHandler.Mount(app.Router())
	credentialsHandler.Mount(app.Router())
	agentsHandler.Mount(app.Router())
	workersHandler.Mount(app.Router())
	buildsHandler.Mount(app.Router())
	createAndBuildHandler.Mount(app.Router())
	operationsHandler.Mount(app.Router())
	sdlcHandler.Mount(app.Router())
	sdlcOrchestratorHandler.Mount(app.Router())

	// Start queue processor worker (per-project command queue)
	queueProcessor := worker.NewQueueProcessor(
		commandQueue,
		k8sExecutor,
		projectRepo,
		streamPub,
		&worker.QueueProcessorConfig{
			PollPeriod: 5 * time.Second,
			Logger:     logger,
		},
	).WithWebhookDispatcher(webhookDispatcher)
	if err := queueProcessor.Start(); err != nil {
		logger.Error("failed to start queue processor", "error", err)
		os.Exit(1)
	}

	// Start work executor (cross-project worker pool, git via kubectl exec)
	buildExecutor := worker.NewBuildExecutor(agentRegistry, podGitOps, streamPub, logger, nil)
	workerCfg := worker.DefaultWorkExecutorConfig()
	workerCfg.Logger = logger
	workExecutor := worker.NewWorkExecutor(
		workerService,
		workService,
		buildExecutor,
		workerCfg,
	)
	if err := workExecutor.Start(); err != nil {
		logger.Error("failed to start work executor", "error", err)
		os.Exit(1)
	}
	healthHandler.WithWorkExecutor(workExecutor)

	// Start queue maintenance worker (stale task recovery, worker health, cleanup, metrics)
	queueMaintenance := worker.NewQueueMaintenance(
		workQueueRepo,
		workerRegistryRepo,
		&worker.QueueMaintenanceConfig{
			StaleTaskTimeout:   30 * time.Minute,
			StaleWorkerTimeout: 2 * time.Minute,
			CleanupAge:         7 * 24 * time.Hour,
			MaintenancePeriod:  1 * time.Minute,
			MetricsPeriod:      15 * time.Second,
			BuildAudit:         buildAuditRepo, // Sync build audit when requeuing stale tasks
			Logger:             logger,
		},
	)
	queueMaintenance.Start()

	// Start operation cleanup worker (30-day retention)
	operationCleanup := worker.NewOperationCleanup(operationRepo, &worker.OperationCleanupConfig{
		RetentionPeriod: 30 * 24 * time.Hour,
		CleanupInterval: 1 * time.Hour,
		Logger:          logger,
	})
	operationCleanup.Start()

	// Enable API documentation
	app.EnableDocs(buildOpenAPISpec())

	app.OnShutdown(func(ctx context.Context) error {
		workExecutor.Stop()
		queueMaintenance.Stop()
		operationCleanup.Stop()
		queueProcessor.Stop()
		webhookDispatcher.Stop()
		projectRepo.StopWatching()
		stopRateLimitCleanup()
		closeProvisioner(dbProvisioner, "database", logger)
		closeProvisioner(cacheProvisioner, "cache", logger)
		if err := tel.Shutdown(ctx); err != nil {
			logger.Error("telemetry shutdown error", "error", err)
		}
		return database.Close()
	})

	logger.Info("rdev-api starting",
		"version", version,
		"port", cfg.Port,
		"db_host", cfg.DBHost,
		"admin_key_set", cfg.AdminKey != "",
	)

	app.Run()
}