package main

import (
	"log"
	"os"

	"server/internal/db"
	"server/internal/handlers"
	"server/internal/qldt"
	"server/internal/syncjobs"
	internalWs "server/internal/websocket"

	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/cors"
	gofiberWs "github.com/gofiber/websocket/v2"
	"github.com/joho/godotenv"
)

func main() {
	if err := godotenv.Load(); err != nil {
		log.Println("Note: .env file not found or couldn't be loaded, using system environments.")
	}

	dbHost := getEnv("DB_HOST", "127.0.0.1")
	dbPort := getEnv("DB_PORT", "3306")
	dbUser := getEnv("DB_USER", "naruto")
	dbPass := getEnv("DB_PASSWORD", "29121999aA@")
	dbName := getEnv("DB_NAME", "simple_care")

	qldtToken := getEnv("QLDT_TOKEN", "")
	qldtBaseURL := getEnv("QLDT_BASE_URL", "https://apiportal.rikkei.edu.vn")
	qldtOrigin := getEnv("QLDT_ORIGIN", "https://qldt.rikkei.edu.vn")

	if qldtToken == "" {
		log.Println("WARNING: QLDT_TOKEN is empty! Sync features will fail until QLDT_TOKEN is configured in environment.")
	}

	gormDB, err := db.ConnectDB(dbHost, dbPort, dbUser, dbPass, dbName)
	if err != nil {
		log.Fatalf("Database connection failed: %v", err)
	}

	if err := db.AutoMigrate(gormDB); err != nil {
		log.Fatalf("Database migration failed: %v", err)
	}

	qldtClient := qldt.NewClient(qldtBaseURL, qldtOrigin)
	classesJob := syncjobs.NewClassesSyncJob()
	studentsJob := syncjobs.NewStudentsSyncJob()

	app := fiber.New(fiber.Config{
		AppName: "Simple Care Sync Backend",
	})

	app.Use(cors.New(cors.Config{
		AllowOrigins: "*",
		AllowHeaders: "Origin, Content-Type, Accept, Authorization",
		AllowMethods: "GET, POST, PATCH, PUT, DELETE, OPTIONS",
	}))

	// WebSocket Upgrade Check
	app.Use("/ws", func(c *fiber.Ctx) error {
		if gofiberWs.IsWebSocketUpgrade(c) {
			c.Locals("allowed", true)
			return c.Next()
		}
		return fiber.ErrUpgradeRequired
	})

	// WebSocket Route
	app.Get("/ws", gofiberWs.New(internalWs.WebSocketHandler(gormDB)))

	api := app.Group("/api")

	// Dashboard Stats
	api.Get("/stats", handlers.GetStatsHandler(gormDB))

	// Classes endpoints
	api.Get("/classes", handlers.ListClassesHandler(gormDB))
	api.Get("/classes/schedules", handlers.ListActiveSchedulesHandler(gormDB))
	api.Get("/classes/:rkId", handlers.GetClassHandler(gormDB))
	api.Patch("/classes/:rkId/studying", handlers.PatchClassStudyingHandler(gormDB))
	api.Get("/classes/:rkId/students", handlers.ListClassStudentsHandler(gormDB))

	// Students endpoints
	api.Get("/students", handlers.ListAllStudentsHandler(gormDB))

	// Sync endpoints
	api.Post("/sync/classes/start", handlers.StartClassesSyncHandler(gormDB, qldtClient, classesJob, qldtToken))
	api.Get("/sync/classes/status", handlers.GetClassesSyncStatusHandler(classesJob))
	api.Post("/sync/students/start", handlers.StartStudentsSyncHandler(gormDB, qldtClient, studentsJob, qldtToken))
	api.Get("/sync/students/status", handlers.GetStudentsSyncStatusHandler(studentsJob))

	// Learning Management endpoints
	api.Get("/classes/:rkId/schedule", handlers.GetClassScheduleHandler(gormDB))
	api.Post("/classes/:rkId/schedule", handlers.SaveClassScheduleHandler(gormDB))
	api.Delete("/classes/:rkId/schedule", handlers.DeleteClassScheduleHandler(gormDB))
	api.Get("/classes/:rkId/allowed-apps", handlers.GetAllowedAppsHandler(gormDB))
	api.Post("/classes/:rkId/allowed-apps", handlers.SaveAllowedAppsHandler(gormDB))
	api.Get("/app-pool", handlers.ListAppPoolHandler(gormDB))

	api.Get("/wifi-pool", handlers.ListWifiPoolHandler(gormDB))
	api.Get("/network/accepted-wifis", handlers.ListAcceptedWifisHandler(gormDB))
	api.Post("/network/accepted-wifis", handlers.SaveAcceptedWifisHandler(gormDB))
	api.Post("/network/accepted-wifis/add", handlers.AddAcceptedWifiHandler(gormDB))
	api.Delete("/network/accepted-wifis/:id", handlers.DeleteAcceptedWifiHandler(gormDB))
	api.Get("/classes/:rkId/session-logs", handlers.ListClassSessionLogsHandler(gormDB))
	api.Get("/classes/:rkId/online-students", handlers.GetOnlineStudentsHandler(gormDB))

	api.Get("/classes/:rkId/courses", handlers.GetClassCoursesHandler(gormDB, qldtClient, qldtToken))
	api.Post("/classes/:rkId/schedule/apply-template", handlers.ApplyScheduleTemplateHandler(gormDB))
	api.Get("/classes/:rkId/attendance", handlers.GetClassAttendanceHandler(gormDB))
	api.Get("/classes/:rkId/attendance/shifts", handlers.ListAttendanceShiftsHandler(gormDB))
	api.Put("/classes/:rkId/attendance/status", handlers.UpdateAttendanceStatusHandler(gormDB))
	api.Post("/classes/:rkId/attendance/push-qldt", handlers.PushAttendanceToQLDTHandler(gormDB, qldtClient, qldtToken))

	// Student syncing offline-resilient log
	api.Post("/student/sync-log", handlers.SyncStudentSessionLogHandler(gormDB))
	api.Get("/student/status", handlers.GetStudentStatusHandler(gormDB))
	api.Get("/student/wifi-policy", handlers.GetStudentWifiPolicyHandler(gormDB))
	api.Post("/student/report-wifi", handlers.ReportWifiHandler(gormDB))
	api.Post("/student/report-blocked-app", handlers.ReportBlockedAppHandler(gormDB))

	port := getEnv("PORT", "8080")
	log.Printf("Server starting on port %s...", port)
	if err := app.Listen(":" + port); err != nil {
		log.Fatalf("Failed to start web server: %v", err)
	}
}

func getEnv(key, defaultVal string) string {
	if val := os.Getenv(key); val != "" {
		return val
	}
	return defaultVal
}