package migration

import (
	"context"
	"path/filepath"
	"testing"

	"cmroubao/backend-api/internal/platform/database"
)

func TestRunnerSupportsUpStatusDownAndIdempotentUp(t *testing.T) {
	db, err := database.Open(
		context.Background(),
		filepath.Join(t.TempDir(), "migration.db"),
	)
	if err != nil {
		t.Fatalf("database.Open() error = %v", err)
	}
	t.Cleanup(func() { _ = db.Close() })

	runner, err := New(db)
	if err != nil {
		t.Fatalf("New() error = %v", err)
	}

	applied, err := runner.Up(context.Background())
	if err != nil {
		t.Fatalf("Up() error = %v", err)
	}
	if applied != 9 {
		t.Fatalf("Up() applied = %d, want 9", applied)
	}
	assertStatuses(t, runner, map[int64]bool{
		1: true,
		2: true,
		3: true,
		4: true,
		5: true,
		6: true,
		7: true,
		8: true,
		9: true,
	})

	applied, err = runner.Up(context.Background())
	if err != nil {
		t.Fatalf("second Up() error = %v", err)
	}
	if applied != 0 {
		t.Fatalf("second Up() applied = %d, want 0", applied)
	}

	if err := runner.Down(context.Background()); err != nil {
		t.Fatalf("Down() error = %v", err)
	}
	assertStatuses(t, runner, map[int64]bool{
		1: true,
		2: true,
		3: true,
		4: true,
		5: true,
		6: true,
		7: true,
		8: true,
		9: false,
	})

	applied, err = runner.Up(context.Background())
	if err != nil {
		t.Fatalf("final Up() error = %v", err)
	}
	if applied != 1 {
		t.Fatalf("final Up() applied = %d, want 1", applied)
	}
	assertStatuses(t, runner, map[int64]bool{
		1: true,
		2: true,
		3: true,
		4: true,
		5: true,
		6: true,
		7: true,
		8: true,
		9: true,
	})
}

func assertStatuses(
	t *testing.T,
	runner *Runner,
	want map[int64]bool,
) {
	t.Helper()
	statuses, err := runner.Status(context.Background())
	if err != nil {
		t.Fatalf("Status() error = %v", err)
	}
	if len(statuses) != len(want) {
		t.Fatalf("Status() count = %d, want %d", len(statuses), len(want))
	}
	for _, status := range statuses {
		applied, ok := want[status.Version]
		if !ok {
			t.Fatalf("unexpected migration status = %+v", status)
		}
		if status.Applied != applied {
			t.Fatalf(
				"migration %d applied = %t, want %t",
				status.Version,
				status.Applied,
				applied,
			)
		}
	}
}