package services_test

import (
	"bytes"
	"context"
	"encoding/json"
	"testing"

	"github.com/andyleap/hnh-map/internal/app"
	"github.com/andyleap/hnh-map/internal/app/services"
	"github.com/andyleap/hnh-map/internal/app/store"
	"go.etcd.io/bbolt"
)

func newTestExportService(t *testing.T) (*services.ExportService, *store.Store) {
	t.Helper()
	db := newTestDB(t)
	st := store.New(db)
	mapSvc := services.NewMapService(services.MapServiceDeps{
		Store:       st,
		GridStorage: t.TempDir(),
		GridUpdates: &app.Topic[app.TileData]{},
	})
	return services.NewExportService(st, mapSvc), st
}

func TestExport_EmptyDB(t *testing.T) {
	export, _ := newTestExportService(t)
	var buf bytes.Buffer
	err := export.Export(context.Background(), &buf)
	if err != nil {
		t.Fatal(err)
	}
	if buf.Len() == 0 {
		t.Fatal("expected non-empty zip output")
	}
	// ZIP magic number
	if buf.Len() < 4 || buf.Bytes()[0] != 0x50 || buf.Bytes()[1] != 0x4b {
		t.Fatal("expected valid zip header")
	}
}

func TestExport_WithGrid(t *testing.T) {
	export, st := newTestExportService(t)
	ctx := context.Background()
	gd := app.GridData{ID: "g1", Map: 1, Coord: app.Coord{X: 0, Y: 0}}
	gdRaw, _ := json.Marshal(gd)
	mi := app.MapInfo{ID: 1, Name: "test", Hidden: false}
	miRaw, _ := json.Marshal(mi)
	st.Update(ctx, func(tx *bbolt.Tx) error {
		if err := st.PutGrid(tx, "g1", gdRaw); err != nil {
			return err
		}
		return st.PutMap(tx, 1, miRaw)
	})
	var buf bytes.Buffer
	err := export.Export(ctx, &buf)
	if err != nil {
		t.Fatal(err)
	}
	if buf.Len() < 4 {
		t.Fatal("expected zip data")
	}
}