package core_test

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

	"github.com/carlosframework/docs/internal/core"
)

// Exercise the embedded server WASM, including its normal garbage collection.
// A native authority snapshot alone hides the incremental deletion regression.
func TestNativeRuleReversalSurvivesServerReplay(t *testing.T) {
	ctx := context.Background()
	rt, err := core.New(ctx)
	if err != nil {
		t.Fatal(err)
	}
	defer rt.Close(ctx)
	doc, err := rt.NewDoc(ctx, "native-rule", 900)
	if err != nil {
		t.Fatal(err)
	}
	defer doc.Close(ctx)
	for step := 0; step <= 6; step++ {
		update, err := os.ReadFile(filepath.Join("..", "..", "fixtures", "vectors", "native-rule", fmt.Sprintf("%d.bin", step)))
		if err != nil {
			t.Fatal(err)
		}
		if err := doc.Apply(ctx, update); err != nil {
			t.Fatalf("step %d: %v", step, err)
		}
	}
	want := "<p>- Alpha</p><p>Beta</p>"
	got, err := doc.HTML(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if got != want {
		t.Fatalf("incremental HTML = %q, want %q", got, want)
	}
	snapshot, err := doc.Snapshot(ctx)
	if err != nil {
		t.Fatal(err)
	}
	reloaded, err := rt.NewDoc(ctx, "native-rule", 901)
	if err != nil {
		t.Fatal(err)
	}
	defer reloaded.Close(ctx)
	if err := reloaded.Apply(ctx, snapshot); err != nil {
		t.Fatal(err)
	}
	got, err = reloaded.HTML(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if got != want {
		t.Fatalf("reloaded HTML = %q, want %q", got, want)
	}
}