package main

import (
	"database/sql"
	"fmt"
	"io/fs"
	"sort"
	"strings"

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

func openDB(path string) (*sql.DB, error) {
	dsn := fmt.Sprintf("file:%s?_journal_mode=WAL&_foreign_keys=on", path)
	db, err := sql.Open("sqlite3", dsn)
	if err != nil {
		return nil, err
	}
	if err := db.Ping(); err != nil {
		return nil, err
	}
	return db, nil
}

func applyMigrations(db *sql.DB) error {
	entries, err := fs.ReadDir(migrationsFS, "migrations")
	if err != nil {
		return err
	}
	names := []string{}
	for _, e := range entries {
		if !e.IsDir() && strings.HasSuffix(e.Name(), ".sql") {
			names = append(names, e.Name())
		}
	}
	sort.Strings(names)
	for _, n := range names {
		b, err := fs.ReadFile(migrationsFS, "migrations/"+n)
		if err != nil {
			return err
		}
		if _, err := db.Exec(string(b)); err != nil {
			low := strings.ToLower(err.Error())
			if strings.Contains(low, "duplicate column") || strings.Contains(low, "already exists") {
				continue
			}
			return fmt.Errorf("%s: %w", n, err)
		}
	}
	return nil
}