/*
 * Copyright (C) 2023 Jonni Liljamo <jonni@liljamo.com>
 *
 * This file is licensed under AGPL-3.0-or-later, see NOTICE and LICENSE for
 * more information.
 */
package db

import (
	"fmt"
	"log/slog"
	"os"
)

var migrationsTable string = "schema_migrations"

func runMigrations() {
	slog.Info("Running migrations")

	var schemaVersion int = 0

	schemaVersionQuery := fmt.Sprintf(
		`SELECT schema_version
			FROM %s
				ORDER BY schema_version
					DESC LIMIT 1`,
		migrationsTable)
	err := DBConn.QueryRow(schemaVersionQuery).Scan(&schemaVersion)
	if err != nil {
		slog.Info("No schema version found, running all migrations")
	} else {
		slog.Info("Current schema", slog.Int("version", schemaVersion))
	}

	migrations := migrations()
	if schemaVersion != len(migrations) {
		for i := 0; i < len(migrations); i++ {
			if i >= schemaVersion {
				slog.Info("Running migration", slog.Int("version", i + 1)) // + 1 is just a visual thing
				_, err := DBConn.Exec(migrations[i])
				if err != nil {
					slog.Error("Migration failed to run!", slog.Int("version", i))
					os.Exit(1)
				}
			}
		}

		// We are now up to date
		schemaVersion = len(migrations)
		// Create a new entry in the migrations table
		schemaMigrationInsertQuery := fmt.Sprintf(
			`INSERT INTO %s(schema_version) VALUES(%d)`,
			migrationsTable, schemaVersion)
		_, err = DBConn.Exec(schemaMigrationInsertQuery)
		if err != nil {
			slog.Error("Migrations ran, but was not able to create migration entry")
			os.Exit(1)
		} else {
			slog.Info("Migrations ran successfully")
		}
	} else {
		slog.Info("No migrations to run")
	}
}

func migrations() []string {
	return []string{
		fmt.Sprintf(`CREATE TABLE %s (
			schema_version INTEGER
		)`, migrationsTable),
		fmt.Sprintf(`CREATE TABLE users (
			id TEXT NOT NULL PRIMARY KEY UNIQUE,
			email TEXT NOT NULL UNIQUE,
			pwd TEXT NOT NULL,
			is_admin INTEGER DEFAULT FALSE NOT NULL
		)`),
		fmt.Sprintf(`CREATE TABLE domains (
			id TEXT NOT NULL PRIMARY KEY UNIQUE,
			apikey TEXT NOT NULL,
			owner TEXT NOT NULL,
			ddns_domain TEXT NOT NULL UNIQUE,
			a_record TEXT,
			FOREIGN KEY(owner) REFERENCES users(id)
		)`),
	}
}