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

package app

import (
	"context"
	"encoding/json"
	"os"
	"os/exec"
	"strings"
	"testing"
	"time"

	"git.stormux.org/storm/cthulhu/internal/atspi"
	"git.stormux.org/storm/cthulhu/internal/input"
	"git.stormux.org/storm/cthulhu/internal/interaction"
	"git.stormux.org/storm/cthulhu/internal/platform/xorg"
	"git.stormux.org/storm/cthulhu/internal/review"
)

func TestNativeInternalUIActionsAndEntry(t *testing.T) {
	if os.Getenv("CTHULHU_NATIVE_INTERNAL_UI") != "1" {
		t.Skip("requires private GTK/AT-SPI fixture")
	}
	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
	defer cancel()
	adapter := atspi.New()
	keys := xorg.NewCommands([]string{"Insert"}, input.DesktopKeyboardLayout)
	worker, err := review.NewWorker(adapter, time.Second)
	if err != nil {
		t.Fatal(err)
	}
	for _, service := range []interface {
		Start(context.Context) error
		Stop(context.Context) error
	}{adapter, worker, keys} {
		if err := service.Start(ctx); err != nil {
			t.Fatal(err)
		}
		defer service.Stop(context.Background())
	}
	output := &ocrTestOutput{speech: make(chan speechRequest, 256)}
	ui := &internalUI{keys: keys, actions: adapter, interest: worker, speech: output, gate: newFocusGate(keys), events: make(chan input.CommandEvent, 32), requests: make(chan internalUIRequest, 1), done: make(chan struct{})}
	go ui.run(ctx)
	focused := make(chan struct{}, 1)
	done := make(chan struct{})
	go func() {
		defer close(done)
		for {
			select {
			case <-ctx.Done():
				return
			case event := <-keys.Commands():
				ui.Handle(event)
			case event := <-adapter.Events():
				if event.Type == atspi.FocusEvent || event.Type == atspi.FocusedStateEvent && event.Detail1 != 0 {
					worker.SyncFocus(event.Source.ID())
					if event.Source.Name == "Run action" {
						select {
						case focused <- struct{}{}:
						default:
						}
					}
				}
			}
		}
	}()
	defer func() { cancel(); <-ui.done; <-done }()
	key := func(names ...string) {
		t.Helper()
		if data, err := exec.CommandContext(ctx, "xdotool", append([]string{"key"}, names...)...).CombinedOutput(); err != nil {
			t.Fatalf("keys: %v %s", err, data)
		}
	}
	key("Tab", "shift+Tab")
	select {
	case <-focused:
	case <-ctx.Done():
		t.Fatal("button did not gain accessible focus")
	}
	original, err := exec.CommandContext(ctx, "xdotool", "getwindowfocus").Output()
	if err != nil {
		t.Fatal(err)
	}
	key("Insert+shift+a")
	select {
	case message := <-output.speech:
		if !strings.Contains(strings.ToLower(message.Text), "click") {
			t.Fatalf("accessible actions=%q", message.Text)
		}
	case <-ctx.Done():
		t.Fatal("actions menu did not open")
	}
	key("Return")
	read := func() (int, string) {
		data, err := os.ReadFile(os.Getenv("CTHULHU_UI_MARKER"))
		if err != nil {
			return 0, ""
		}
		var value struct {
			Clicks int    `json:"clicks"`
			Text   string `json:"text"`
		}
		if json.Unmarshal(data, &value) != nil {
			return 0, ""
		}
		return value.Clicks, value.Text
	}
	for {
		clicks, _ := read()
		if clicks == 1 {
			break
		}
		if ctx.Err() != nil {
			t.Fatal("accessible click not performed")
		}
		time.Sleep(10 * time.Millisecond)
	}
	originalActions, err := adapter.AccessibleActions(ctx, worker.Focus())
	if err != nil {
		t.Fatal(err)
	}
	result, err := ui.Open(ctx, interaction.Form{Title: "Example", Elements: []interaction.Element{{ID: "code", Label: "Code", Kind: interaction.Entry}}})
	if err != nil {
		t.Fatal(err)
	}
	for keys.InternalUISession() == 0 {
		if ctx.Err() != nil {
			t.Fatal("entry did not open")
		}
		time.Sleep(time.Millisecond)
	}
	key("a", "shift+b", "c", "BackSpace", "exclam", "shift+Home", "ctrl+c")
copied:
	for {
		select {
		case message := <-output.speech:
			if message.Text == "Copied" {
				break copied
			}
		case <-ctx.Done():
			t.Fatal("entry copy did not complete")
		}
	}
	clipboardText, err := read_internal_clipboard(ctx)
	if err != nil || clipboardText != "aB!" {
		t.Fatalf("copied text = %q, %v", clipboardText, err)
	}
	key("BackSpace", "ctrl+v", "d", "Return")
	select {
	case submitted := <-result:
		if submitted.Err != nil || submitted.Values["code"].Text != "aB!d" {
			t.Fatalf("entry result=%+v", submitted)
		}
	case <-ctx.Done():
		t.Fatal("entry did not submit")
	}
	current, _ := exec.CommandContext(ctx, "xdotool", "getwindowfocus").Output()
	if string(current) != string(original) {
		t.Fatal("internal UI moved application focus")
	}
	clicks, text := read()
	if clicks != 1 || text != "" {
		t.Fatalf("UI keys reached GTK: clicks=%d text=%q", clicks, text)
	}
	key("Tab", "q")
	for {
		_, text = read()
		if text == "q" {
			break
		}
		if ctx.Err() != nil {
			t.Fatalf("ordinary typing did not resume: %q", text)
		}
		time.Sleep(10 * time.Millisecond)
	}
	if err := adapter.PerformAccessibleAction(ctx, originalActions.Target, "click"); err == nil {
		t.Fatal("stale focus action was performed")
	}
	clicks, _ = read()
	if clicks != 1 {
		t.Fatal("stale action clicked old target")
	}
	// Fresh one-line transfer reads share native foreground/password safeguards.
	item, err := adapter.ReadTransferItem(ctx, worker.Focus(), -1)
	if err != nil || item.Text != "q" {
		t.Fatalf("focused entry transfer=%+v %v", item, err)
	}
	key("Tab")
	for {
		item, err = adapter.ReadTransferItem(ctx, worker.Focus(), -1)
		if err == nil && item.Text == "First  line" {
			break
		}
		if ctx.Err() != nil {
			t.Fatalf("multiline transfer=%+v %v", item, err)
		}
		time.Sleep(10 * time.Millisecond)
	}
	// A browser's virtual caret can request another line without moving native focus.
	item, err = adapter.ReadTransferItem(ctx, worker.Focus(), 12)
	if err != nil || item.Text != "Second line" {
		t.Fatalf("virtual transfer=%+v %v", item, err)
	}
	key("ctrl+Tab")
	for {
		if _, err = adapter.ReadTransferItem(ctx, worker.Focus(), -1); err != nil {
			break
		}
		if ctx.Err() != nil {
			t.Fatal("protected item was exported")
		}
		time.Sleep(10 * time.Millisecond)
	}

}