package db

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"sort"
	"strings"
)

func RunMigrations(ctx context.Context, db *DB, dir string) error {
	files, err := os.ReadDir(dir)
	if err != nil {
		return fmt.Errorf("read migrations dir: %w", err)
	}

	var ups []string
	for _, f := range files {
		if !f.IsDir() && strings.HasSuffix(f.Name(), ".up.sql") {
			ups = append(ups, f.Name())
		}
	}
	sort.Strings(ups)

	for _, name := range ups {
		path := filepath.Join(dir, name)
		data, err := os.ReadFile(path)
		if err != nil {
			return fmt.Errorf("read %s: %w", name, err)
		}
		if _, err := db.Pool.Exec(ctx, string(data)); err != nil {
			return fmt.Errorf("exec %s: %w", name, err)
		}
		fmt.Printf("[migrate] applied %s\n", name)
	}
	return nil
}