// 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 input

import (
	"testing"
	"time"
)

func TestReviewMultiPressSequences(t *testing.T) {
	for _, layout := range []KeyboardLayout{DesktopKeyboardLayout, LaptopKeyboardLayout} {
		for _, modifierFirst := range []bool{false, true} {
			router := NewCommandRouter([]uint32{0xff63}, DefaultCommandBindings(layout))
			now := time.Unix(100, 0)
			router.now = func() time.Time { return now }
			wordKey, charKey := uint32(0xff9d), uint32(0xff99)
			if layout == LaptopKeyboardLayout {
				wordKey, charKey = 'k', ','
			}
			press := func(symbol uint32, want Command) {
				t.Helper()
				if layout == LaptopKeyboardLayout {
					router.Handle(0xff63, 118, 0, true)
				}
				if consumed, got := router.Handle(symbol, 30, 0, true); !consumed || got != want {
					t.Fatalf("layout=%d press=%x got=%s want=%s", layout, symbol, got, want)
				}
				if consumed, got := router.Handle(symbol, 30, 0, true); !consumed || got != "" {
					t.Fatal("held-key repeat dispatched")
				}
				if layout == LaptopKeyboardLayout && modifierFirst {
					router.Handle(0xff63, 118, 0, false)
				}
				if consumed, got := router.Handle(symbol, 30, 0, false); !consumed || got != "" {
					t.Fatal("unbalanced release")
				}
				if layout == LaptopKeyboardLayout && !modifierFirst {
					router.Handle(0xff63, 118, 0, false)
				}
				router.Reset()
				router.ReplaceBindings(BrowseCommandBindings(layout))
			}
			press(charKey, ReviewCurrentCharacter)
			now = now.Add(500 * time.Millisecond)
			press(charKey, ReviewPhoneticCharacter)
			press(charKey, ReviewCurrentCharacter)
			press(wordKey, ReviewCurrentWord) // Different chord resets the sequence.
			press(wordKey, ReviewSpellWord)
			press(wordKey, ReviewPhoneticWord)
			press(wordKey, ReviewCurrentWord)
			now = now.Add(501 * time.Millisecond)
			press(wordKey, ReviewCurrentWord)
			router.Handle(0xffbe, 67, 0, true) // Unbound intervening key.
			router.Handle(0xffbe, 67, 0, false)
			press(wordKey, ReviewCurrentWord)
			now = now.Add(-time.Millisecond)
			press(wordKey, ReviewCurrentWord) // Clock reversal must not count.
		}
	}
}

func TestFlatReviewLayoutBindingsAndBalancedRelease(t *testing.T) {
	for _, tc := range []struct {
		desktop, laptop uint32
		command         Command
	}{
		{0xff95, 'u', ReviewPreviousLine}, {0xff97, 'i', ReviewCurrentLine}, {0xff9a, 'o', ReviewNextLine},
		{0xff96, 'j', ReviewPreviousWord}, {0xff9d, 'k', ReviewCurrentWord}, {0xff98, 'l', ReviewNextWord},
		{0xff9c, 'm', ReviewPreviousCharacter}, {0xff99, ',', ReviewCurrentCharacter}, {0xff9b, '.', ReviewNextCharacter},
	} {
		for _, layout := range []KeyboardLayout{DesktopKeyboardLayout, LaptopKeyboardLayout} {
			for _, modifierFirst := range []bool{false, true} {
				router := NewCommandRouter([]uint32{0xff63}, DefaultCommandBindings(layout))
				symbol := tc.desktop
				if layout == LaptopKeyboardLayout {
					symbol = tc.laptop
					if consumed, _ := router.Handle(symbol, 30, 0, true); consumed {
						t.Fatal("unmodified laptop letter consumed")
					}
					router.Handle(symbol, 30, 0, false)
					router.Handle(0xff63, 118, 0, true)
				}
				if consumed, cmd := router.Handle(symbol, 30, 0, true); !consumed || cmd != tc.command {
					t.Fatalf("press: %v %q", consumed, cmd)
				}
				if consumed, cmd := router.Handle(symbol, 30, 0, true); !consumed || cmd != "" {
					t.Fatalf("repeat: %v %q", consumed, cmd)
				}
				if layout == LaptopKeyboardLayout && modifierFirst {
					router.Handle(0xff63, 118, 0, false)
				}
				consumed, cmd := router.Handle(symbol, 30, 0, false)
				if !consumed {
					t.Fatal("review release leaked")
				}
				if layout == LaptopKeyboardLayout && !modifierFirst {
					if cmd != "" {
						t.Fatal("command emitted while Insert held")
					}
					_, cmd = router.Handle(0xff63, 118, 0, false)
				}
				if cmd != "" {
					t.Fatalf("release dispatched %q", cmd)
				}
			}
		}
	}
}

func TestFlatReviewWindowBindingsAndBalancedRelease(t *testing.T) {
	for _, tc := range []struct {
		symbol    uint32
		layout    KeyboardLayout
		modifiers uint16
		command   Command
	}{
		{0xff95, DesktopKeyboardLayout, 0, ReviewWindowStart},
		{0xff9a, DesktopKeyboardLayout, 0, ReviewWindowEnd},
		{'u', LaptopKeyboardLayout, controlModifier, ReviewWindowStart},
		{'o', LaptopKeyboardLayout, controlModifier, ReviewWindowEnd},
	} {
		for _, releaseModifierFirst := range []bool{false, true} {
			router := NewCommandRouter([]uint32{0xff63}, DefaultCommandBindings(tc.layout))
			router.Handle(0xff63, 118, 0, true)
			if consumed, command := router.Handle(tc.symbol, 30, tc.modifiers, true); !consumed || command != tc.command {
				t.Fatalf("press: consumed=%v command=%q", consumed, command)
			}
			releases := []struct {
				symbol uint32
				code   uint16
			}{{tc.symbol, 30}, {0xff63, 118}}
			if releaseModifierFirst {
				releases[0], releases[1] = releases[1], releases[0]
			}
			for _, key := range releases {
				if consumed, command := router.Handle(key.symbol, key.code, 0, false); !consumed || command != "" {
					t.Fatalf("release: consumed=%v command=%q", consumed, command)
				}
			}
		}
	}
}

func TestFlatReviewVerticalAndLineEndBindings(t *testing.T) {
	for _, tc := range []struct {
		symbol    uint32
		layout    KeyboardLayout
		modifiers uint16
		command   Command
	}{
		{0xff96, DesktopKeyboardLayout, 0, ReviewWordAbove},
		{0xff98, DesktopKeyboardLayout, 0, ReviewWordBelow},
		{0xff9c, DesktopKeyboardLayout, 0, ReviewLineEnd},
		{'j', LaptopKeyboardLayout, controlModifier, ReviewWordAbove},
		{'l', LaptopKeyboardLayout, controlModifier, ReviewWordBelow},
		{'m', LaptopKeyboardLayout, controlModifier, ReviewLineEnd},
	} {
		router := NewCommandRouter([]uint32{0xff63}, DefaultCommandBindings(tc.layout))
		router.Handle(0xff63, 118, 0, true)
		if consumed, command := router.Handle(tc.symbol, 30, tc.modifiers, true); !consumed || command != tc.command {
			t.Fatalf("press: consumed=%v command=%q want=%q", consumed, command, tc.command)
		}
		if consumed, command := router.Handle(tc.symbol, 30, 0, false); !consumed || command != "" {
			t.Fatalf("release: consumed=%v command=%q", consumed, command)
		}
		if consumed, command := router.Handle(0xff63, 118, 0, false); !consumed || command != "" {
			t.Fatalf("modifier release: consumed=%v command=%q", consumed, command)
		}
	}
}