// Package database provides database initialization and access for RSMon.
package database

import (
	"fmt"
	"log"
	"os"
	"time"

	"gorm.io/driver/postgres"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"

	"rocketgit.ru/rsmon/worker/app/models"
	_ "rocketgit.ru/rsmon/worker/config/env" // Import to ensure .env is loaded before reading env vars
)

// db Gorm DB
var db *gorm.DB

// Logger provides functionality.
var Logger logger.Interface

func envOrDefault(key, fallbackKey, defaultVal string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	if fallbackKey != "" {
		if v := os.Getenv(fallbackKey); v != "" {
			return v
		}
	}
	return defaultVal
}

// Init provides functionality.
func Init() {
	host := envOrDefault("DATABASE_HOST", "POSTGRES_HOST", "localhost")
	portStr := envOrDefault("DATABASE_PORT", "POSTGRES_PORT", "5432")
	user := envOrDefault("DATABASE_USER", "POSTGRES_USER", "rsmon")
	pass := envOrDefault("DATABASE_PASSWORD", "POSTGRES_PASSWORD", "rsmon")
	dbname := envOrDefault("DATABASE_NAME", "POSTGRES_DB", "rsmon_development")
	dbLog := envOrDefault("DATABASE_LOG", "", "false")

	port := 5432
	_, _ = fmt.Sscanf(portStr, "%d", &port)

	connstr := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
		host, port, user, pass, dbname)

	logMode := logger.Silent
	if dbLog == "true" || dbLog == "1" {
		logMode = logger.Info
	}

	cfg := &gorm.Config{
		Logger: logger.Default.LogMode(logMode),
	}

	pg := postgres.Open(connstr)
	var err error
	db, err = gorm.Open(pg, cfg)
	if err != nil {
		panic(err)
	}

	sqlDB, err := db.DB()
	if err != nil {
		panic(err)
	}
	sqlDB.SetMaxIdleConns(10)
	sqlDB.SetMaxOpenConns(10)
	sqlDB.SetConnMaxLifetime(time.Hour)

	models.RegisterCallbacks(db)
	db = db.Set("gorm:association_autoupdate", false)
	models.SetDB(db)

	log.Printf("Database connected: %s@%s:%d/%s (log=%s)", user, host, port, dbname, dbLog)
}