# SPDX-FileCopyrightText: 2021-2024 Leroy Hopson <godot-xterm@leroy.nix.nz>
# SPDX-License-Identifier: MIT

class_name TerminalTest extends GodotXtermTest


func get_described_class():
	return Terminal


func before_each():
	super.before_each()
	subject.size = Vector2(400, 200)


# Helper function to fill the screen with the given character.
func fill_screen(char: String = "A") -> String:
	var result = char.repeat(subject.get_cols() * subject.get_rows())
	subject.write(result)
	return result


class TestInterface:
	extends TerminalTest

	## API V2.

	# Properties.

	func test_has_property_bell_muted():
		assert_has_property_with_default_value("bell_muted", false)

	func test_has_property_bell_cooldown():
		assert_has_property_with_default_value("bell_cooldown", 0.1)

	func test_has_property_blink_on_time():
		assert_has_property_with_default_value("blink_on_time", 0.6)

	func test_has_property_blink_off_time():
		assert_has_property_with_default_value("blink_off_time", 0.3)

	func test_has_property_copy_on_selection():
		assert_has_property_with_default_value("copy_on_selection", false)

	# TODO: Implement update_mode property.
	func xtest_has_property_update_mode():
		#assert_has_property_with_default_value("update_mode", UPDATE_MODE_AUTO)
		pass

	# cols and rows removed.

	# Methods.

	func test_has_method_clear():
		assert_has_method_with_return_type("clear", TYPE_NIL)

	func test_has_method_copy_all():
		assert_has_method_with_return_type("copy_all", TYPE_STRING)

	func test_has_method_copy_selection():
		assert_has_method_with_return_type("copy_selection", TYPE_STRING)

	func test_has_method_get_cols():
		assert_has_method_with_return_type("get_cols", TYPE_INT)

	func test_has_method_get_rows():
		assert_has_method_with_return_type("get_rows", TYPE_INT)

	func test_has_method_write():
		assert_has_method(subject, "write")

	# Signals.

	func test_has_signal_data_sent():
		assert_has_signal(subject, "data_sent")

	func test_has_signal_key_pressed():
		assert_has_signal(subject, "key_pressed")

	func test_has_signal_size_changed():
		assert_has_signal(subject, "size_changed")

	func test_has_signal_bell():
		assert_has_signal(subject, "bell")

	# Enums.

	# TODO: Implement UpdateMode enum.
	func xtest_has_enum_update_mode():
		assert_eq(described_class.UPDATE_MODE_DISABLED, 0)
		assert_eq(described_class.AUTO, 1)
		assert_eq(described_class.ALL, 2)
		assert_eq(described_class.ALL_NEXT_FRAME, 3)

	## API Next.

	# Methods.

	func test_has_method_get_cursor_pos():
		assert_has_method_with_return_type("get_cursor_pos", TYPE_VECTOR2I)

	func test_has_method_get_cell_size():
		assert_has_method_with_return_type("get_cell_size", TYPE_VECTOR2)

	func test_has_method_write_with_response():
		assert_has_method_with_return_type("write", TYPE_STRING)

	# Enums.

	func test_has_enum_inverse_mode():
		assert_eq(described_class.INVERSE_MODE_INVERT, 0)
		assert_eq(described_class.INVERSE_MODE_SWAP, 1)

	## Other tests.

	func test_has_no_visible_children():
		# We add children like the bell timer for private use that should not
		# be visible outside of the node itself.
		assert_eq(subject.get_child_count(), 0)


class TestBell:
	extends TerminalTest

	func test_bell() -> void:
		watch_signals(subject)
		subject.bell_cooldown = 0
		subject.write(char(7))
		subject.write(char(0x07))
		subject.write("\a")
		subject.write("\u0007")
		subject.write("'Ask not for whom the \a tolls; it tolls for thee' - John Donne")
		assert_signal_emit_count(subject, "bell", 5)

	func test_bell_mute() -> void:
		watch_signals(subject)
		subject.bell_muted = true
		subject.write("\a")
		assert_signal_emit_count(subject, "bell", 0)

	func test_bell_cooldown() -> void:
		watch_signals(subject)
		subject.bell_cooldown = 10000
		subject.write("\a")
		subject.write("\a")
		assert_signal_emit_count(subject, "bell", 1)

	func test_change_cooldown_while_active() -> void:
		watch_signals(subject)
		subject.bell_cooldown = 10000
		subject.write("\a")
		subject.bell_cooldown = 0
		subject.write("\a")
		assert_signal_emit_count(subject, "bell", 2)


class TestCursorPos:
	extends TerminalTest

	func test_get_cursor_pos_initial():
		assert_eq(subject.get_cursor_pos(), Vector2i.ZERO)

	func test_get_cursor_pos_x():
		subject.write("_")
		assert_eq(subject.get_cursor_pos().x, 1)

	func test_get_cursor_pos_y():
		subject.write("_".repeat(subject.cols + 1))
		assert_eq(subject.get_cursor_pos().y, 1)


class TestWrite:
	extends TerminalTest

	func test_returns_response_when_input_contains_query():
		var response = subject.write("\u001b[6n")  # Query cursor position.
		assert_eq(response, "\u001b[1;1R")

	func test_returns_response_to_multiple_queries():
		var response = subject.write("\u001b[6n\u001b[5n")  # Query cursor position and status.
		assert_eq(response, "\u001b[1;1R\u001b[0n")

	func test_returns_response_to_multiple_queries_among_other_data():
		var response = subject.write("hello\r\nworld\u001b[6nother\r\ndata\u001b[5ntest")
		assert_eq(response, "\u001b[2;6R\u001b[0n")

	func test_data_sent_emitted_on_query():
		subject.write("\u001b[6n")
		assert_signal_emitted(subject, "data_sent")

	func test_data_sent_emitted_with_response():
		subject.write("\u001b[6n")
		assert_signal_emitted_with_parameters(
			subject, "data_sent", ["\u001b[1;1R".to_utf8_buffer()]
		)

	func test_data_sent_not_emitted_when_empty_string_written():
		subject.write("")
		assert_signal_emit_count(subject, "data_sent", 0)


class TestCopy:
	extends TerminalTest

	func test_copy_all_copies_the_entire_screen():
		var text = fill_screen()
		# The text will be wrapped over multiple lines and copy_all() preserves
		# these line wraps, therefore we need to strip them.
		assert_eq(subject.copy_all().replace("\n", ""), text)

	func test_copy_all_empty_screen():
		assert_eq(subject.copy_all(), "\n".repeat(subject.get_rows()))

	func test_copy_all_copies_the_scrollback_buffer():
		var text = fill_screen()
		text += fill_screen("B")
		text += fill_screen("C")
		assert_eq(subject.copy_all().replace("\n", ""), text)

	func test_copy_all_copies_unicode_text():
		var text = "ｱｲｳｴｵｶｷｸｹｺｻｼｽｾｿ"
		subject.write(text)
		assert_string_contains(subject.copy_all(), text)

	func test_copy_selection_when_nothing_selected():
		assert_eq(subject.copy_selection(), "")


class TestClear:
	extends TerminalTest

	func test_clear_an_empty_screen_changes_nothing():
		var empty_screen = subject.copy_all()
		subject.clear()
		var screen_after = subject.copy_all()
		assert_eq(screen_after, empty_screen)

	func test_clear_when_screen_is_full_clears_all_but_the_bottommost_row():
		fill_screen()
		var final_line = "THIS SHOULDN'T BE CLEARED"
		subject.write(final_line)
		subject.clear()
		var screen_after = subject.copy_all()
		var expected = final_line + "\n".repeat(subject.get_rows())
		assert_eq(screen_after, expected)


class TestSelect:
	extends TerminalTest

	# Use the behavior of TextEdit's select() method as a reference.
	var text_edit: TextEdit

	func assert_select_eq(argv, expected):
		text_edit.callv("select", argv)
		subject.callv("select", argv)
		assert_eq(
			expected,
			text_edit.get_selected_text(),
			"expected does not match reference implementation"
		)
		assert_eq(subject.copy_selection(), expected)

	func before_each():
		super.before_each()
		text_edit = TextEdit.new()
		text_edit.text = "0123456789\nABCDEFGHIJ\n)!@#$%^&*(\n\n\n\n\n\n"
		add_child_autofree(text_edit)
		subject.write("0123456789\r\nABCDEFGHIJ\r\n)!@#$%^&*(")

	func test_select_nothing():
		assert_select_eq([0, 0, 0, 0], "")

	func test_select_first_character():
		assert_select_eq([0, 0, 0, 1], "0")

	func test_select_last_character():
		assert_select_eq([2, 9, 2, 10], "(")

	func test_select_reverse_column():
		assert_select_eq([0, 6, 0, 1], "12345")

	func test_select_preceeds_column_bounds():
		assert_select_eq([0, -2, 0, -1], "")
		assert_select_eq([0, -2, 0, 0], "")
		assert_select_eq([0, -2, 0, 1], "0")

	func test_select_exceeds_column_bounds():
		assert_select_eq([0, 5, 0, 999], "56789")

	func test_select_first_row():
		assert_select_eq([0, 0, 0, 10], "0123456789")

	func test_select_second_row():
		assert_select_eq([1, 0, 1, 10], "ABCDEFGHIJ")

	func test_select_multiple_rows():
		assert_select_eq([0, 0, 1, 10], "0123456789\nABCDEFGHIJ")

	func test_select_rows_reverse():
		assert_select_eq([1, 5, 0, 0], "0123456789\nABCDE")

	func test_select_preceeds_row_bounds():
		assert_select_eq([-2, 0, -1, 10], "0123456789")
		assert_select_eq([-2, 0, 0, 10], "0123456789")
		assert_select_eq([-2, 0, 1, 10], "0123456789\nABCDEFGHIJ")

	func test_select_exceeds_row_bounds():
		assert_select_eq([1, 5, 999, 999], "FGHIJ\n)!@#$%^&*(\n\n\n\n\n\n")

	func test_wide_bounds():
		assert_select_eq([-999, -999, 999, 999], "0123456789\nABCDEFGHIJ\n)!@#$%^&*(\n\n\n\n\n\n")