package main

import (
	"log"

	"github.com/gin-gonic/gin"

	"git.gobha.me/xcaliber/chat-switchboard/config"
	"git.gobha.me/xcaliber/chat-switchboard/database"
	"git.gobha.me/xcaliber/chat-switchboard/handlers"
	"git.gobha.me/xcaliber/chat-switchboard/middleware"
	"git.gobha.me/xcaliber/chat-switchboard/providers"
)

func main() {
	cfg := config.Load()

	// Register LLM providers
	providers.Init()

	if err := database.Connect(cfg); err != nil {
		log.Printf("⚠ Database unavailable: %v", err)
		log.Println("  Running in unmanaged mode (no persistence)")
	}
	defer database.Close()

	r := gin.Default()
	r.Use(middleware.CORS())

	// Health check (k8s probes hit this directly)
	r.GET("/health", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"status":   "ok",
			"version":  Version,
			"database": database.IsConnected(),
		})
	})

	// ── Auth routes (rate limited) ──────────────
	auth := handlers.NewAuthHandler(cfg)
	authLimiter := middleware.NewRateLimiter(1, 5)

	api := r.Group("/api/v1")
	{
		// Health (routable through ingress)
		api.GET("/health", func(c *gin.Context) {
			info := gin.H{
				"status":    "ok",
				"version":   Version,
				"database":  database.IsConnected(),
				"providers": providers.List(),
			}
			// Include registration status for frontend
			if database.IsConnected() {
				info["registration_enabled"] = isRegistrationOpen()
			}
			c.JSON(200, info)
		})

		authGroup := api.Group("/auth")
		authGroup.Use(authLimiter.Limit())
		{
			authGroup.POST("/register", auth.Register)
			authGroup.POST("/login", auth.Login)
			authGroup.POST("/refresh", auth.Refresh)
			authGroup.POST("/logout", auth.Logout)
		}

		// ── Protected routes ────────────────────
		protected := api.Group("")
		protected.Use(middleware.Auth(cfg))
		{
			// Chats
			chats := handlers.NewChatHandler()
			protected.GET("/chats", chats.ListChats)
			protected.POST("/chats", chats.CreateChat)
			protected.GET("/chats/:id", chats.GetChat)
			protected.PUT("/chats/:id", chats.UpdateChat)
			protected.DELETE("/chats/:id", chats.DeleteChat)

			// Messages
			msgs := handlers.NewMessageHandler()
			protected.GET("/chats/:id/messages", msgs.ListMessages)
			protected.POST("/chats/:id/messages", msgs.CreateMessage)

			// ── Chat Engine (#8) ────────────────
			comp := handlers.NewCompletionHandler()
			protected.POST("/chat/completions", comp.Complete)
			protected.POST("/chats/:id/regenerate", msgs.Regenerate) // TODO: wire to completion handler

			// API Configs
			apiCfg := handlers.NewAPIConfigHandler()
			protected.GET("/api-configs", apiCfg.ListConfigs)
			protected.POST("/api-configs", apiCfg.CreateConfig)
			protected.GET("/api-configs/:id", apiCfg.GetConfig)
			protected.PUT("/api-configs/:id", apiCfg.UpdateConfig)
			protected.DELETE("/api-configs/:id", apiCfg.DeleteConfig)

			// Models (per-config and aggregate)
			protected.GET("/api-configs/:id/models", apiCfg.ListModels)
			protected.GET("/models", apiCfg.ListAllModels)

			// User Settings & Profile
			settings := handlers.NewSettingsHandler()
			protected.GET("/profile", settings.GetProfile)
			protected.PUT("/profile", settings.UpdateProfile)
			protected.POST("/profile/password", settings.ChangePassword)
			protected.GET("/settings", settings.GetSettings)
			protected.PUT("/settings", settings.UpdateSettings)
		}

		// ── Admin routes ────────────────────────
		admin := api.Group("/admin")
		admin.Use(middleware.Auth(cfg))
		admin.Use(middleware.RequireAdmin())
		{
			adm := handlers.NewAdminHandler()

			// User management
			admin.GET("/users", adm.ListUsers)
			admin.POST("/users", adm.CreateUser)
			admin.PUT("/users/:id/role", adm.UpdateUserRole)
			admin.PUT("/users/:id/active", adm.ToggleUserActive)
			admin.POST("/users/:id/reset-password", adm.ResetPassword)
			admin.DELETE("/users/:id", adm.DeleteUser)

			// Global settings
			admin.GET("/settings", adm.ListGlobalSettings)
			admin.GET("/settings/:key", adm.GetGlobalSetting)
			admin.PUT("/settings/:key", adm.UpdateGlobalSetting)

			// Stats
			admin.GET("/stats", adm.GetStats)
		}
	}

	log.Printf("🔀 Chat Switchboard API v%s starting on port %s", Version, cfg.Port)
	log.Printf("   Providers: %v", providers.List())
	if err := r.Run(":" + cfg.Port); err != nil {
		log.Fatalf("Failed to start server: %v", err)
	}
}

func isRegistrationOpen() bool {
	return handlers.IsRegistrationEnabled()
}