package rdp

import "testing"

func TestScancodeMapping(t *testing.T) {
	tests := []struct {
		jsCode   string
		expected uint32
	}{
		{"Escape", 0x0001},
		{"Digit1", 0x0002},
		{"Digit0", 0x000B},
		{"KeyA", 0x001E},
		{"KeyZ", 0x002C},
		{"Enter", 0x001C},
		{"Space", 0x0039},
		{"Tab", 0x000F},
		{"Backspace", 0x000E},
		{"ShiftLeft", 0x002A},
		{"ShiftRight", 0x0036},
		{"ControlLeft", 0x001D},
		{"ControlRight", 0xE01D},
		{"AltLeft", 0x0038},
		{"AltRight", 0xE038},
		{"CapsLock", 0x003A},
		{"F1", 0x003B},
		{"F12", 0x0058},
		{"ArrowUp", 0xE048},
		{"ArrowDown", 0xE050},
		{"ArrowLeft", 0xE04B},
		{"ArrowRight", 0xE04D},
		{"Insert", 0xE052},
		{"Delete", 0xE053},
		{"Home", 0xE047},
		{"End", 0xE04F},
		{"PageUp", 0xE049},
		{"PageDown", 0xE051},
		{"NumLock", 0x0045},
		{"Numpad0", 0x0052},
		{"Numpad9", 0x0049},
		{"NumpadEnter", 0xE01C},
		{"NumpadAdd", 0x004E},
		{"NumpadSubtract", 0x004A},
		{"NumpadMultiply", 0x0037},
		{"NumpadDivide", 0xE035},
		{"NumpadDecimal", 0x0053},
		{"MetaLeft", 0xE05B},
		{"MetaRight", 0xE05C},
		{"ContextMenu", 0xE05D},
		{"PrintScreen", 0xE037},
		{"ScrollLock", 0x0046},
		{"Backquote", 0x0029},
		{"Minus", 0x000C},
		{"Equal", 0x000D},
		{"BracketLeft", 0x001A},
		{"BracketRight", 0x001B},
		{"Backslash", 0x002B},
		{"Semicolon", 0x0027},
		{"Quote", 0x0028},
		{"Comma", 0x0033},
		{"Period", 0x0034},
		{"Slash", 0x0035},
	}

	for _, tt := range tests {
		t.Run(tt.jsCode, func(t *testing.T) {
			sc, ok := JSKeyToScancode(tt.jsCode)
			if !ok {
				t.Fatalf("JSKeyToScancode(%q) returned false", tt.jsCode)
			}
			if sc != tt.expected {
				t.Errorf("JSKeyToScancode(%q) = 0x%04X, want 0x%04X", tt.jsCode, sc, tt.expected)
			}
		})
	}
}

func TestAllLetterKeys(t *testing.T) {
	// Verify all 26 letter keys are mapped
	letters := "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	for _, ch := range letters {
		code := "Key" + string(ch)
		_, ok := JSKeyToScancode(code)
		if !ok {
			t.Errorf("missing mapping for %s", code)
		}
	}
}

func TestAllDigitKeys(t *testing.T) {
	for i := 0; i <= 9; i++ {
		code := "Digit" + string(rune('0'+i))
		_, ok := JSKeyToScancode(code)
		if !ok {
			t.Errorf("missing mapping for %s", code)
		}
	}
}

func TestAllFunctionKeys(t *testing.T) {
	fKeys := []string{"F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "F10", "F11", "F12"}
	for _, key := range fKeys {
		_, ok := JSKeyToScancode(key)
		if !ok {
			t.Errorf("missing mapping for %s", key)
		}
	}
}

func TestAllNumpadKeys(t *testing.T) {
	numpadKeys := []string{
		"Numpad0", "Numpad1", "Numpad2", "Numpad3", "Numpad4",
		"Numpad5", "Numpad6", "Numpad7", "Numpad8", "Numpad9",
		"NumpadAdd", "NumpadSubtract", "NumpadMultiply", "NumpadDivide",
		"NumpadDecimal", "NumpadEnter", "NumLock",
	}
	for _, key := range numpadKeys {
		_, ok := JSKeyToScancode(key)
		if !ok {
			t.Errorf("missing mapping for %s", key)
		}
	}
}

func TestUnknownKey(t *testing.T) {
	sc, ok := JSKeyToScancode("FakeKey123")
	if ok {
		t.Errorf("unknown key returned ok=true with scancode 0x%04X", sc)
	}
	if sc != 0 {
		t.Errorf("unknown key scancode = 0x%04X, want 0", sc)
	}
}

func TestIsExtendedKey(t *testing.T) {
	tests := []struct {
		name     string
		scancode uint32
		extended bool
	}{
		{"Escape (not extended)", 0x0001, false},
		{"Enter (not extended)", 0x001C, false},
		{"Right Ctrl (extended)", 0xE01D, true},
		{"Right Alt (extended)", 0xE038, true},
		{"ArrowUp (extended)", 0xE048, true},
		{"Insert (extended)", 0xE052, true},
		{"NumpadEnter (extended)", 0xE01C, true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := IsExtendedKey(tt.scancode)
			if got != tt.extended {
				t.Errorf("IsExtendedKey(0x%04X) = %v, want %v", tt.scancode, got, tt.extended)
			}
		})
	}
}

func TestScancodeValue(t *testing.T) {
	tests := []struct {
		name     string
		scancode uint32
		value    uint8
	}{
		{"Escape", 0x0001, 0x01},
		{"Right Ctrl", 0xE01D, 0x1D},
		{"ArrowUp", 0xE048, 0x48},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := ScancodeValue(tt.scancode)
			if got != tt.value {
				t.Errorf("ScancodeValue(0x%04X) = 0x%02X, want 0x%02X", tt.scancode, got, tt.value)
			}
		})
	}
}

func TestMouseFlags(t *testing.T) {
	// Verify the flag constants have the right values
	if MouseFlagMove != 0x0800 {
		t.Errorf("MouseFlagMove = 0x%04X, want 0x0800", MouseFlagMove)
	}
	if MouseFlagButton1 != 0x1000 {
		t.Errorf("MouseFlagButton1 = 0x%04X, want 0x1000", MouseFlagButton1)
	}
	if MouseFlagButton2 != 0x2000 {
		t.Errorf("MouseFlagButton2 = 0x%04X, want 0x2000", MouseFlagButton2)
	}
	if MouseFlagButton3 != 0x4000 {
		t.Errorf("MouseFlagButton3 = 0x%04X, want 0x4000", MouseFlagButton3)
	}
	if MouseFlagDown != 0x8000 {
		t.Errorf("MouseFlagDown = 0x%04X, want 0x8000", MouseFlagDown)
	}

	// Test combining flags — left click down
	flags := MouseFlagButton1 | MouseFlagDown
	if flags != 0x9000 {
		t.Errorf("left click down = 0x%04X, want 0x9000", flags)
	}

	// Test combining flags — right click up (no Down flag)
	flags = MouseFlagButton2
	if flags != 0x2000 {
		t.Errorf("right click up = 0x%04X, want 0x2000", flags)
	}
}

func TestScancodeMapCompleteness(t *testing.T) {
	// Minimum expected mappings for a standard 104-key US keyboard:
	// 26 letters + 10 digits + 12 F-keys + escape + tab + caps + 2 shifts +
	// 2 ctrls + 2 alts + 2 metas + space + enter + backspace +
	// numrow punctuation (backquote, minus, equal) +
	// bracket pair + backslash + semicolon + quote + comma + period + slash +
	// 4 arrows + insert + delete + home + end + pageup + pagedown +
	// printscreen + scrolllock + pause +
	// numlock + numpad 0-9 + numpad operators (5) + numpad enter + numpad decimal +
	// context menu
	// = 26+10+12+1+1+1+2+2+2+2+1+1+1+3+2+1+1+1+1+1+1+4+6+3+1+10+5+1+1+1 = ~104
	minExpected := 90 // conservative lower bound for core keys
	if len(ScancodeMap) < minExpected {
		t.Errorf("ScancodeMap has %d entries, expected at least %d", len(ScancodeMap), minExpected)
	}
}