package initializers

import (
	"log"
	"os"

	"gitea.tbdevent.eu/TBD/reforger_crawler_main/models"
	"gopkg.in/yaml.v3"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

var DB *gorm.DB
var PORT string
var IP string
var SECRET string
var DB_NAME string
var DiscordWebhook string
var ADMIN_SECRET string
var ScraperWebhook string

func ConnectToDB() {
	db, err := gorm.Open(sqlite.Open(DB_NAME), &gorm.Config{
		PrepareStmt:            true, // Cache prepared statements
		SkipDefaultTransaction: true, // Disable default transactions for better performance
	})
	if err != nil {
		log.Fatal("Failed to connect to database")
	}

	DB = db

	// Optimize SQLite for performance
	DB.Exec("PRAGMA journal_mode=WAL")    // Write-Ahead Logging for better concurrency
	DB.Exec("PRAGMA synchronous=NORMAL")  // Balance between safety and speed
	DB.Exec("PRAGMA cache_size=-64000")   // 64MB cache (negative = KB)
	DB.Exec("PRAGMA temp_store=MEMORY")   // Use memory for temp tables
	DB.Exec("PRAGMA mmap_size=268435456") // 256MB memory-mapped I/O

	DB.AutoMigrate(&models.Addon{}, &models.AddonFile{}, &models.WhitelistedHash{})

	// Create optimized indexes for duplicate detection queries
	// Composite index for efficient hash lookups excluding specific addon_id
	DB.Exec(`CREATE INDEX IF NOT EXISTS idx_addon_files_hash_addon_optimized 
		ON addon_files(hash, addon_id) WHERE deleted_at IS NULL`)

	// Index for whitelisted hashes lookup
	DB.Exec(`CREATE INDEX IF NOT EXISTS idx_whitelisted_hash 
		ON whitelisted_hashes(hash)`)

	// Additional index on addon_id for the JOIN operation
	DB.Exec(`CREATE INDEX IF NOT EXISTS idx_addons_id 
		ON addons(id)`)

	// Covering index for addon_files to avoid table lookups
	DB.Exec(`CREATE INDEX IF NOT EXISTS idx_addon_files_covering 
		ON addon_files(addon_id, hash, path, version) WHERE deleted_at IS NULL`)
}

type Configuration struct {
	Port           string `yaml:"port"`
	IP             string `yaml:"ip"`
	Secret         string `yaml:"secret"`
	DB             string `yaml:"db"`
	DiscordWebhook string `yaml:"discordWebhook"`
	ADMIN_SECRET   string `yaml:"adminSecret"`
	ScraperWebhook string `yaml:"scraperWebhook"`
}

func Load() {
	file, err := os.ReadFile("config.yaml")
	if err != nil {
		log.Fatal("Failed to open config file")
	}

	configuration := Configuration{
		DB: "register.db",
	}
	err = yaml.Unmarshal(file, &configuration)
	if err != nil {
		log.Fatal("Failed to read yaml file")
	}

	PORT = configuration.Port
	IP = configuration.IP
	SECRET = configuration.Secret
	DB_NAME = configuration.DB
	DiscordWebhook = configuration.DiscordWebhook
	ADMIN_SECRET = configuration.ADMIN_SECRET
	ScraperWebhook = configuration.ScraperWebhook
}