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package editor

import (
	"testing"

	tea "github.com/charmbracelet/bubbletea"
)

// --- TASK-027: mouse drag-select ---

func TestMouseAnchorMovesCursorNoSelection(t *testing.T) {
	e := New()
	e.SetSize(80, 10)
	e.SetContent([]byte("hello world"))
	e.MouseExtendTo(0, 5) // pretend a stale selection exists
	e.MouseAnchor(0, 3)
	if e.HasSelection() {
		t.Fatal("MouseAnchor left a selection active")
	}
	if e.Cursor.Col != 3 {
		t.Fatalf("cursor col = %d, want 3", e.Cursor.Col)
	}
}

func TestMouseExtendCreatesSelectionFromAnchor(t *testing.T) {
	e := New()
	e.SetSize(80, 10)
	e.SetContent([]byte("hello world"))
	e.MouseAnchor(0, 2)
	e.MouseExtendTo(0, 7)
	if got := e.SelectedText(); got != "llo w" {
		t.Fatalf("selection = %q, want %q", got, "llo w")
	}
}

func TestMouseExtendKeepsOriginalAnchorAcrossMotions(t *testing.T) {
	e := New()
	e.SetSize(80, 10)
	e.SetContent([]byte("hello world"))
	e.MouseAnchor(0, 2)
	e.MouseExtendTo(0, 4)
	e.MouseExtendTo(0, 9) // a second drag motion must not re-anchor at col 4
	if got := e.SelectedText(); got != "llo wor" {
		t.Fatalf("selection = %q, want %q", got, "llo wor")
	}
}

// --- TASK-023: Alt+x keybind toggles + is undoable ---

func TestAltXTogglesCheckboxUndoable(t *testing.T) {
	e := New()
	e.SetContent([]byte("- [ ] task"))
	e.Cursor = Position{Row: 0, Col: 9}
	altX := tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune("x"), Alt: true}
	e.HandleKey(altX)
	if got := e.Lines[0]; got != "- [x] task" {
		t.Fatalf("after Alt+x line = %q, want %q", got, "- [x] task")
	}
	e.Undo()
	if got := e.Lines[0]; got != "- [ ] task" {
		t.Fatalf("after undo line = %q, want %q", got, "- [ ] task")
	}
}