package verifier

import (
	"errors"
	"os"
	"path/filepath"
	"testing"

	"github.com/priyanshujain/sanderling/internal/bundler"
	"github.com/priyanshujain/sanderling/internal/hierarchy"
)

// bundleInlineSpec bundles an inline spec through the real @sanderling/spec API
// and goja runtime entry, so the bundle installs __sanderlingSetupAction__ the
// way the CLI does.
func bundleInlineSpec(t *testing.T, source string) string {
	t.Helper()
	dir := t.TempDir()
	specPath := filepath.Join(dir, "spec.ts")
	if err := os.WriteFile(specPath, []byte(source), 0o600); err != nil {
		t.Fatal(err)
	}
	abs := func(rel string) string {
		path, err := filepath.Abs(rel)
		if err != nil {
			t.Fatal(err)
		}
		return path
	}
	bundle, err := bundler.Bundle(bundler.Options{
		EntryFile:   specPath,
		RuntimeFile: abs("../../pkg/spec/src/goja-runtime.ts"),
		Aliases: map[string]string{
			"@sanderling/spec":                     abs("../../pkg/spec/src/index.ts"),
			"@sanderling/spec/defaults":            abs("../../pkg/spec/src/defaults/index.ts"),
			"@sanderling/spec/defaults/properties": abs("../../pkg/spec/src/defaults/properties.ts"),
		},
	})
	if err != nil {
		t.Fatalf("bundle: %v", err)
	}
	return string(bundle.JavaScript)
}

func loadBundled(t *testing.T, source, treeJSON string) *Verifier {
	t.Helper()
	v, err := New()
	if err != nil {
		t.Fatal(err)
	}
	if err := v.Load(bundleInlineSpec(t, source)); err != nil {
		t.Fatalf("load: %v", err)
	}
	tree, err := hierarchy.Parse(treeJSON)
	if err != nil {
		t.Fatal(err)
	}
	if err := v.PushSnapshot(SnapshotInput{Tree: tree}); err != nil {
		t.Fatalf("push snapshot: %v", err)
	}
	return v
}

func TestSetupActionWalksSetupOnly(t *testing.T) {
	spec := `
import { Tap, actions, taps } from "@sanderling/spec";
export const setup = actions(() => [Tap({ on: "id:SignIn" })]);
export const actionsRoot = taps;
`
	v := loadBundled(t, spec, enumTreeJSON)
	action, err := v.SetupAction()
	if err != nil {
		t.Fatalf("SetupAction: %v", err)
	}
	if action.Kind != ActionKindTap || action.On != "id:SignIn" {
		t.Errorf("SetupAction = %+v, want Tap on id:SignIn from setup", action)
	}
}

func TestSetupActionIgnoresActionsRoot(t *testing.T) {
	// No setup, but a live actionsRoot that NextAction would happily draw from.
	spec := `
import { taps } from "@sanderling/spec";
export const actionsRoot = taps;
`
	v := loadBundled(t, spec, enumTreeJSON)
	if _, err := v.SetupAction(); !errors.Is(err, ErrNoAction) {
		t.Fatalf("SetupAction err = %v, want ErrNoAction when no setup is declared", err)
	}
	// Sanity: the seeded root would have produced an action, proving SetupAction
	// deliberately skips it.
	if _, err := v.NextAction(); err != nil {
		t.Fatalf("NextAction should draw from actionsRoot: %v", err)
	}
}