package updates_test

import (
	"os"
	"regexp"
	"slices"
	"strings"
	"testing"

	"git.golem15.com/golem15/summercms/docs/examples/blog"
	"git.golem15.com/golem15/summercms/docs/examples/blog/updates"
)

var migrationFile = regexp.MustCompile(`^(\d{14})_[a-z0-9_]+\.go$`)

func TestMigrationIDs(t *testing.T) {
	if got := updates.CreatePosts().ID; got != "20260101000000_create_acme_blog_posts" {
		t.Errorf("CreatePosts ID = %q", got)
	}

	// The plugin returns the set in registry.gen.go's order, which must be
	// ascending by ID: gormigrate applies it in slice order.
	var ids []string
	for _, m := range (&blog.Plugin{}).Migrations() {
		if m.Migrate == nil || m.Rollback == nil {
			t.Errorf("migration %s has no Migrate or Rollback", m.ID)
		}
		ids = append(ids, m.ID)
	}
	if len(ids) == 0 {
		t.Fatal("the plugin has no migrations")
	}
	if !slices.IsSorted(ids) {
		t.Errorf("migration IDs are not in ascending order: %v", ids)
	}

	// Every migration file is named after its ID, and every ID has a file.
	entries, err := os.ReadDir(".")
	if err != nil {
		t.Fatal(err)
	}
	var files []string
	for _, e := range entries {
		name := e.Name()
		if e.IsDir() || name == "doc.go" || strings.HasSuffix(name, "_test.go") || !strings.HasSuffix(name, ".go") {
			continue
		}
		if !migrationFile.MatchString(name) {
			t.Errorf("%s does not start with a 14-digit timestamp", name)
			continue
		}
		files = append(files, strings.TrimSuffix(name, ".go"))
	}
	if !slices.Equal(files, ids) {
		t.Errorf("migration files %v, want one per ID %v", files, ids)
	}
}