// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
// SPDX-License-Identifier: GPL-3.0-or-later

package app

import (
	"context"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"os/exec"
	"strings"
	"testing"
	"time"

	"git.stormux.org/storm/cthulhu/internal/atspi"
	"git.stormux.org/storm/cthulhu/internal/review"
)

func TestNativeBrowserDynamicNavigation(t *testing.T) {
	if os.Getenv("CTHULHU_NATIVE_BROWSER") != "1" {
		t.Skip("requires private browser session")
	}
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()
	page := `<!doctype html><title>Dynamic navigation regression</title>
<a href="#end">Start of page</a>
<button aria-label="Counter" onfocus="this.setAttribute('aria-label', 'Counter updated')">Counter</button>
<p>After control</p>
<svg role="img" aria-label="Avatar" width="16" height="16"><circle cx="8" cy="8" r="8"/></svg>
<button aria-label="Add content" onfocus="const p = document.createElement('p'); p.textContent = 'New content'; document.body.appendChild(p); this.setAttribute('aria-label', 'Add content done')">Add content</button>`
	// A large document must remain navigable without exhausting the live
	// two-second first-capture budget before any browse position exists.
	for i := 0; i < 1000; i++ {
		page += fmt.Sprintf("<p>Unrelated paragraph %d</p>", i)
	}
	page += `<p id="end">End of page</p>`
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprint(w, page)
	}))
	defer server.Close()
	adapter := atspi.New()
	adapter.SetCaptureSoundGeometry(true)
	if err := adapter.Start(ctx); err != nil {
		t.Fatal(err)
	}
	defer adapter.Stop(context.Background())
	command := func(args ...string) {
		t.Helper()
		if output, err := exec.CommandContext(ctx, "xdotool", args...).CombinedOutput(); err != nil {
			t.Fatalf("xdotool: %v: %s", err, output)
		}
	}
	command("key", "--clearmodifiers", "ctrl+l")
	command("type", "--clearmodifiers", "--delay", "0", server.URL)
	command("key", "Return")
	var document atspi.ObjectID
	var applicationName string
	for !document.Valid() {
		select {
		case event := <-adapter.Events():
			if event.Type == atspi.DocumentLoadCompleteEvent && event.Source.Name == "Dynamic navigation regression" {
				document = event.Source.ID()
				applicationName = event.Source.ApplicationName
			}
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		}
	}
	worker, err := review.NewWorker(adapter, 2*time.Second)
	if err != nil {
		t.Fatal(err)
	}
	if err := worker.SetFlatCaptureTimeout(10 * time.Second); err != nil {
		t.Fatal(err)
	}
	if err := worker.Start(ctx); err != nil {
		t.Fatal(err)
	}
	defer worker.Stop(context.Background())
	worker.SyncFocus(document)
	move := func(command review.DocumentCaretCommand, want string) {
		t.Helper()
		if err := worker.MoveDocumentCaret(command); err != nil {
			t.Fatal(err)
		}
		select {
		case result := <-worker.Results():
			got := result.DocumentCaretText
			if got == "" {
				got = result.DocumentPosition.Snapshot.Name
			}
			if result.Err != nil || result.CaretErr != nil || !result.Moved || !strings.Contains(got, want) {
				t.Fatalf("next line = %q, want %q: %+v", got, want, result)
			}
			if result.DocumentPosition.Snapshot.ApplicationName != applicationName {
				t.Fatalf("document target application = %q, want %q", result.DocumentPosition.Snapshot.ApplicationName, applicationName)
			}
			t.Logf("line=%q elapsed=%s capture=%s reason=%v", got, result.Elapsed, result.CaptureDuration, result.CaptureReason)
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		}
	}
	next := func(want string) {
		t.Helper()
		move(review.CaretNextLine, want)
	}
	next("Start of page")
	next("Counter")
	waitName := func(name string) {
		t.Helper()
		for {
			select {
			case event := <-adapter.Events():
				if event.Type == atspi.AccessibleNameEvent && event.Source.Name == name {
					return
				}
			case <-ctx.Done():
				t.Fatalf("name change to %q was not observed", name)
			}
		}
	}
	waitName("Counter updated")
	next("After control")
	next("Avatar")
	next("Add content")
	waitName("Add content done")
	next("Unrelated paragraph 0")
	next("Unrelated paragraph 1")
	move(review.CaretDocumentEnd, "New content")
	for _, unit := range []review.FlatUnit{review.WindowEnd, review.Line} {
		started := time.Now()
		step := 0
		if unit == review.Line {
			step = -1
		}
		if err := worker.ReadFlat(unit, step); err != nil {
			t.Fatal(err)
		}
		select {
		case result := <-worker.Results():
			t.Logf("flat review unit %d elapsed=%s capture=%s reason=%v", unit, time.Since(started), result.CaptureDuration, result.CaptureReason)
			if result.Err != nil || strings.TrimSpace(result.FlatPosition.Text) == "" || unit == review.Line && !result.Moved {
				t.Fatalf("large-page flat review unit %d = %+v", unit, result)
			}
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		}
	}
}