// 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 TestNativeBrowserRevealedHeadings(t *testing.T) {
	if os.Getenv("CTHULHU_NATIVE_BROWSER") != "1" {
		t.Skip("requires private browser session")
	}
	ctx, cancel := context.WithTimeout(context.Background(), 25*time.Second)
	defer cancel()
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprint(w, `<!doctype html><title>Revealed headings regression</title>
<style>.hidden { display: none }</style>
<section><h2>Across</h2><div data-clues>`)
		for i := 1; i <= 12; i++ {
			class := ""
			if i > 5 {
				class = "hidden"
			}
			fmt.Fprintf(w, `<div class="%s"><div><span>%d</span><h3><a href="/clue/%d">Clue %d</a></h3><div><button>A</button><button>B</button><button>C</button></div></div><div><button>Answer</button><button>Hint</button></div></div>`, class, i, i, i)
		}
		fmt.Fprint(w, `</div><div><button onclick="document.querySelectorAll('[data-clues] > div').forEach((e,i) => { if (i > 4) e.classList.toggle('hidden') }); this.firstChild.firstChild.data = this.textContent === 'More clues' ? 'Fewer clues' : 'More clues' "><span>More clues</span></button></div></section>
<h2>Following section</h2>`)
	}))
	defer server.Close()
	adapter := atspi.New()
	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)
		}
	}
	window, err := exec.CommandContext(ctx, "xdotool", "search", "--onlyvisible", "--name", "Cthulhu Browser Probe").Output()
	if err != nil || len(strings.Fields(string(window))) == 0 {
		t.Fatalf("browser window: %s: %v", window, err)
	}
	command("windowfocus", strings.Fields(string(window))[0])
	command("key", "--clearmodifiers", "ctrl+l")
	command("type", "--clearmodifiers", "--delay", "1", server.URL)
	command("key", "Return")
	var document atspi.ObjectID
	for !document.Valid() {
		select {
		case event := <-adapter.Events():
			if event.Type == atspi.DocumentLoadCompleteEvent && event.Source.Name == "Revealed headings regression" {
				document = event.Source.ID()
			}
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		}
	}
	worker, err := review.NewWorker(adapter, 2*time.Second)
	if err != nil {
		t.Fatal(err)
	}
	if err := worker.Start(ctx); err != nil {
		t.Fatal(err)
	}
	defer worker.Stop(context.Background())
	worker.SyncFocus(document)
	result := func(want string) {
		t.Helper()
		select {
		case result := <-worker.Results():
			if result.Err != nil || result.DocumentPosition.Snapshot.Name != want {
				t.Fatalf("navigation = %q, want %q: err=%v capture=%v diagnostics=%+v", result.DocumentPosition.Snapshot.Name, want, result.Err, result.CaptureReason, result.DocumentDiagnostics)
			}
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		}
	}
	if err := worker.MoveDocument(review.DocumentHeading, 0, false); err != nil {
		t.Fatal(err)
	}
	result("Across")
	if err := worker.MoveDocument(review.DocumentHeading, 0, true); err != nil {
		t.Fatal(err)
	}
	result("Following section")
	if err := worker.MoveDocumentCaret(review.CaretPreviousLine); err != nil {
		t.Fatal(err)
	}
	result("More clues")
	activate := func(want string) {
		t.Helper()
		if err := worker.ActivateDocumentCaret(); err != nil {
			t.Fatal(err)
		}
		select {
		case result := <-worker.Results():
			if result.Err != nil {
				t.Fatal(result.Err)
			}
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		}
		for {
			select {
			case event := <-adapter.Events():
				if event.Type == atspi.AccessibleNameEvent && event.Source.Name == want && event.Source.Role == "button" {
					return
				}
			case <-ctx.Done():
				t.Fatal("clue toggle was not observed: ", ctx.Err())
			}
		}
	}
	activate("Fewer clues")
	// The added headings precede the button. Browse in both directions
	// without ever tabbing into the new content.
	for _, step := range []struct {
		backwards bool
		want      string
	}{
		{true, "Clue 12"},
		{true, "Clue 11"},
		{false, "Clue 12"},
		{false, "Following section"},
	} {
		if err := worker.MoveDocument(review.DocumentHeading, 0, step.backwards); err != nil {
			t.Fatal(err)
		}
		result(step.want)
	}
	if err := worker.MoveDocumentCaret(review.CaretPreviousLine); err != nil {
		t.Fatal(err)
	}
	result("Fewer clues")
	activate("More clues")
	if err := worker.MoveDocument(review.DocumentHeading, 0, true); err != nil {
		t.Fatal(err)
	}
	result("Clue 5")
}