package tea

import (
	"bytes"
	"testing"
)

func TestKeyString(t *testing.T) {
	t.Run("alt+space", func(t *testing.T) {
		if got := KeyMsg(Key{
			Type: KeySpace,
			Alt:  true,
		}).String(); got != "alt+ " {
			t.Fatalf(`expected a "alt+ ", got %q`, got)
		}
	})

	t.Run("runes", func(t *testing.T) {
		if got := KeyMsg(Key{
			Type:  KeyRunes,
			Runes: []rune{'a'},
		}).String(); got != "a" {
			t.Fatalf(`expected an "a", got %q`, got)
		}
	})

	t.Run("invalid", func(t *testing.T) {
		if got := KeyMsg(Key{
			Type: KeyType(99999),
		}).String(); got != "" {
			t.Fatalf(`expected a "", got %q`, got)
		}
	})
}

func TestKeyTypeString(t *testing.T) {
	t.Run("space", func(t *testing.T) {
		if got := KeySpace.String(); got != " " {
			t.Fatalf(`expected a " ", got %q`, got)
		}
	})

	t.Run("invalid", func(t *testing.T) {
		if got := KeyType(99999).String(); got != "" {
			t.Fatalf(`expected a "", got %q`, got)
		}
	})
}

func TestReadInput(t *testing.T) {
	type test struct {
		in  []byte
		out []Msg
	}
	for out, td := range map[string]test{
		"a": {
			[]byte{'a'},
			[]Msg{
				KeyMsg{
					Type:  KeyRunes,
					Runes: []rune{'a'},
				},
			},
		},
		" ": {
			[]byte{' '},
			[]Msg{
				KeyMsg{
					Type:  KeySpace,
					Runes: []rune{' '},
				},
			},
		},
		"ctrl+a": {
			[]byte{byte(keySOH)},
			[]Msg{
				KeyMsg{
					Type: KeyCtrlA,
				},
			},
		},
		"alt+a": {
			[]byte{byte(0x1b), 'a'},
			[]Msg{
				KeyMsg{
					Type:  KeyRunes,
					Alt:   true,
					Runes: []rune{'a'},
				},
			},
		},
		"abcd": {
			[]byte{'a', 'b', 'c', 'd'},
			[]Msg{
				KeyMsg{
					Type:  KeyRunes,
					Runes: []rune{'a'},
				},
				KeyMsg{
					Type:  KeyRunes,
					Runes: []rune{'b'},
				},
				KeyMsg{
					Type:  KeyRunes,
					Runes: []rune{'c'},
				},
				KeyMsg{
					Type:  KeyRunes,
					Runes: []rune{'d'},
				},
			},
		},
		"up": {
			[]byte("\x1b[A"),
			[]Msg{
				KeyMsg{
					Type: KeyUp,
				},
			},
		},
		"wheel up": {
			[]byte{'\x1b', '[', 'M', byte(32) + 0b0100_0000, byte(65), byte(49)},
			[]Msg{
				MouseMsg{
					Type: MouseWheelUp,
				},
			},
		},
		"shift+tab": {
			[]byte{'\x1b', '[', 'Z'},
			[]Msg{
				KeyMsg{
					Type: KeyShiftTab,
				},
			},
		},
		"alt+enter": {
			[]byte{'\x1b', '\r'},
			[]Msg{
				KeyMsg{
					Type: KeyEnter,
					Alt:  true,
				},
			},
		},
		"alt+ctrl+a": {
			[]byte{'\x1b', byte(keySOH)},
			[]Msg{
				KeyMsg{
					Type: KeyCtrlA,
					Alt:  true,
				},
			},
		},
	} {
		t.Run(out, func(t *testing.T) {
			msgs, err := readInputs(bytes.NewReader(td.in))
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			if len(msgs) != len(td.out) {
				t.Fatalf("unexpected message list length")
			}

			if len(msgs) == 1 {
				if m, ok := msgs[0].(KeyMsg); ok && m.String() != out {
					t.Fatalf(`expected a keymsg %q, got %q`, out, m)
				}
			}

			for i, v := range msgs {
				if m, ok := v.(KeyMsg); ok &&
					m.String() != td.out[i].(KeyMsg).String() {
					t.Fatalf(`expected a keymsg %q, got %q`, td.out[i].(KeyMsg), m)
				}
				if m, ok := v.(MouseMsg); ok &&
					(mouseEventTypes[m.Type] != out || m.Type != td.out[i].(MouseMsg).Type) {
					t.Fatalf(`expected a mousemsg %q, got %q`,
						out,
						mouseEventTypes[td.out[i].(MouseMsg).Type])
				}
			}
		})
	}
}