package database

import (
	"log"

	"database/sql"
	_ "github.com/mattn/go-sqlite3"
)

type Migrator func(*sql.DB) (*sql.DB, error)

func MigrateUsers(dbConn *sql.DB) (*sql.DB, error) {
	log.Println("migrating users table")

	_, err := dbConn.Exec(`CREATE TABLE IF NOT EXISTS users (
		id TEXT PRIMARY KEY,
                mail TEXT NOT NULL,
		username TEXT NOT NULL,
                display_name TEXT NOT NULL,
		created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
	);`)
	if err != nil {
		return dbConn, err
	}

	log.Println("creating unique index on users table")
	_, err = dbConn.Exec(`CREATE UNIQUE INDEX IF NOT EXISTS idx_users_username ON users (username);`)
	if err != nil {
		return dbConn, err
	}

	return dbConn, nil
}

func MigrateApiKeys(dbConn *sql.DB) (*sql.DB, error) {
	log.Println("migrating api_keys table")

	_, err := dbConn.Exec(`CREATE TABLE IF NOT EXISTS api_keys (
                key TEXT PRIMARY KEY,
		user_id INTEGER NOT NULL,
		created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
		FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
	);`)
	if err != nil {
		return dbConn, err
	}
	return dbConn, nil
}

func MigrateDNSRecords(dbConn *sql.DB) (*sql.DB, error) {
	log.Println("migrating dns_records table")

	_, err := dbConn.Exec(`CREATE TABLE IF NOT EXISTS dns_records (
		id TEXT PRIMARY KEY,
		user_id INTEGER NOT NULL,
		name TEXT NOT NULL,
		type TEXT NOT NULL,
		content TEXT NOT NULL,
		ttl INTEGER NOT NULL,
		created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
		FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE);`)
	if err != nil {
		return dbConn, err
	}
	return dbConn, nil
}

func MigrateUserSessions(dbConn *sql.DB) (*sql.DB, error) {
	log.Println("migrating user_sessions table")

	_, err := dbConn.Exec(`CREATE TABLE IF NOT EXISTS user_sessions (
		id TEXT PRIMARY KEY,
		user_id TEXT NOT NULL,
		expire_at TIMESTAMP NOT NULL,
		FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
	);`)
	if err != nil {
		return dbConn, err
	}

	return dbConn, nil
}

func Migrate(dbConn *sql.DB) (*sql.DB, error) {
	log.Println("migrating database")

	migrations := []Migrator{
		MigrateUsers,
		MigrateUserSessions,
		MigrateApiKeys,
		MigrateDNSRecords,
	}

	for _, migration := range migrations {
		dbConn, err := migration(dbConn)
		if err != nil {
			return dbConn, err
		}
	}

	return dbConn, nil
}