// Cthulhu screen reader.
// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.

package app

import (
	"context"
	"log/slog"
	"testing"
	"time"

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

func TestProcessEventsSpeaksChangedCaretLines(t *testing.T) {
	speech := &fakeSpeechQueue{spoken: make(chan string, 2)}
	adapter := &fakeAdapter{events: make(chan atspi.Event, 3)}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	completed := make(chan struct{})
	go func() {
		processEvents(ctx, slog.New(slog.DiscardHandler), speech, adapter, 0)
		close(completed)
	}()

	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshot("/accessible/terminal", "", "terminal", "", "First line"))
	select {
	case text := <-speech.spoken:
		if text != "First line" {
			t.Fatalf("spoken text = %q, want %q", text, "First line")
		}
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for first caret speech")
	}

	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshot("/accessible/terminal", "", "terminal", "", "First line"))
	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshot("/accessible/terminal", "", "terminal", "", "Second line"))
	select {
	case text := <-speech.spoken:
		if text != "Second line" {
			t.Fatalf("spoken text = %q, want %q", text, "Second line")
		}
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for second caret speech")
	}

	cancel()
	select {
	case <-completed:
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for event loop to stop")
	}
}

func TestProcessEventsSuppressesCaretAfterEditableTextChange(t *testing.T) {
	speech := &fakeSpeechQueue{spoken: make(chan string, 3)}
	adapter := &fakeAdapter{events: make(chan atspi.Event, 4)}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	completed := make(chan struct{})
	go func() {
		processEvents(ctx, slog.New(slog.DiscardHandler), speech, adapter, 0)
		close(completed)
	}()

	paragraph := atspi.Snapshot{Path: "/writer/paragraph", Role: "paragraph", Editable: true,
		Text: "Hello", CaretCharacter: "o"}
	adapter.events <- atspi.NewEvent(atspi.FocusEvent, paragraph)
	<-speech.spoken
	adapter.events <- atspi.NewEventWithPayload(atspi.TextInsertedEvent, paragraph, "o")
	if got := <-speech.spoken; got != "o" {
		t.Fatalf("insert speech = %q", got)
	}
	adapter.events <- atspi.NewEvent(atspi.CaretEvent, paragraph)
	adapter.events <- atspi.NewEventWithPayload(atspi.TextInsertedEvent,
		atspi.Snapshot{Path: "/status", Role: "label"}, "status update")

	select {
	case got := <-speech.spoken:
		t.Fatalf("unexpected duplicate or status speech: %q", got)
	case <-time.After(30 * time.Millisecond):
	}

	cancel()
	<-completed
}

func TestProcessEventsSpeaksCaretCharacters(t *testing.T) {
	speech := &fakeSpeechQueue{spoken: make(chan string, 3)}
	adapter := &fakeAdapter{events: make(chan atspi.Event, 3)}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	completed := make(chan struct{})
	go func() {
		processEvents(ctx, slog.New(slog.DiscardHandler), speech, adapter, 0)
		close(completed)
	}()

	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshotWithCaretCharacter(
		"/accessible/terminal", "", "terminal", "", "prompt ls", "l",
	))
	select {
	case text := <-speech.spoken:
		if text != "l" {
			t.Fatalf("spoken text = %q, want %q", text, "l")
		}
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for first caret character speech")
	}
	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshotWithCaretCharacter(
		"/accessible/terminal", "", "terminal", "", "prompt ll", "l",
	))
	select {
	case text := <-speech.spoken:
		if text != "l" {
			t.Fatalf("repeated caret character = %q, want l", text)
		}
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for repeated caret character speech")
	}

	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshotWithCaretCharacter(
		"/accessible/terminal", "", "terminal", "", "prompt ls", "s",
	))
	select {
	case text := <-speech.spoken:
		if text != "s" {
			t.Fatalf("spoken text = %q, want %q", text, "s")
		}
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for second caret character speech")
	}

	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshotWithCaretCharacter(
		"/accessible/terminal", "", "terminal", "", "prompt ls", " ",
	))
	select {
	case text := <-speech.spoken:
		if text != "space" {
			t.Fatalf("spoken caret space = %q, want %q", text, "space")
		}
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for caret space speech")
	}

	cancel()
	select {
	case <-completed:
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for event loop to stop")
	}
}

func TestProcessEventsTextChangeCancelsPendingCaretLine(t *testing.T) {
	speech := &fakeSpeechQueue{spoken: make(chan string, 1)}
	adapter := &fakeAdapter{events: make(chan atspi.Event, 2)}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	completed := make(chan struct{})
	go func() {
		processEvents(ctx, slog.New(slog.DiscardHandler), speech, adapter, time.Hour)
		close(completed)
	}()

	terminal := atspi.NewSnapshot("/accessible/terminal", "", "terminal", "", "prompt l")
	adapter.events <- atspi.NewEvent(atspi.CaretEvent, terminal)
	adapter.events <- atspi.NewEventWithPayload(atspi.TextInsertedEvent, terminal, "l")

	select {
	case text := <-speech.spoken:
		if text != "l" {
			t.Fatalf("spoken text = %q, want %q", text, "l")
		}
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for inserted text speech")
	}

	select {
	case text := <-speech.spoken:
		t.Fatalf("unexpected additional speech: %q", text)
	default:
	}

	cancel()
	select {
	case <-completed:
	case <-time.After(time.Second):
		t.Fatal("timed out waiting for event loop to stop")
	}
}

func TestCaretEventRequestsCharacterVoice(t *testing.T) {
	queue := &autocompleteRequestQueue{requests: make(chan speechRequest, 1)}
	adapter := &fakeAdapter{events: make(chan atspi.Event, 1)}
	ctx, cancel := context.WithCancel(context.Background())
	done := make(chan struct{})
	go func() { defer close(done); processEvents(ctx, slog.New(slog.DiscardHandler), queue, adapter, 0) }()
	defer func() { cancel(); <-done }()
	adapter.events <- atspi.NewEvent(atspi.CaretEvent, atspi.NewSnapshotWithCaretCharacter("/terminal", "", "terminal", "", "Ab", "A"))
	select {
	case request := <-queue.requests:
		if request.Text != "A" || !request.Character {
			t.Fatalf("caret request = %+v", request)
		}
	case <-time.After(time.Second):
		t.Fatal("caret speech missing")
	}
}