package editor

import (
	"testing"

	"git.gophernest.net/azpect/TextEditor/internal/core"
)

// ============================================================================
// Word Text Object Tests (iw/aw)
// ============================================================================

func TestTextObjectInnerWord(t *testing.T) {
	t.Run("test 'viw' selects inner word", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "v", "i", "w")

		m := getFinalModel(t, tm)
		if !m.Mode().IsVisualMode() {
			t.Errorf("Expected visual mode")
		}
		// Should select "hello" (cols 0-4)
		if m.ActiveWindow().Anchor.Col != 0 || m.ActiveWindow().Cursor.Col != 4 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=0, cursor=4",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'diw' deletes inner word", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "d", "i", "w")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != " world" {
			t.Errorf("lines[0] = %q, want ' world'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'ciw' changes inner word", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "c", "i", "w")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != " world" {
			t.Errorf("lines[0] = %q, want ' world'", m.ActiveBuffer().Lines[0])
		}
		if m.Mode() != core.InsertMode {
			t.Errorf("Expected insert mode after ciw")
		}
	})

	t.Run("test 'yiw' yanks inner word", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "y", "i", "w")

		m := getFinalModel(t, tm)
		reg, ok := m.GetRegister('"')
		if !ok {
			t.Fatalf("Default register not found")
		}
		if len(reg.Content) != 1 || reg.Content[0] != "hello" {
			t.Errorf("register content = %v, want ['hello']", reg.Content)
		}
	})

	t.Run("test 'viw' at start of word", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 0, Line: 0})
		sendKeys(tm, "v", "i", "w")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 0 || m.ActiveWindow().Cursor.Col != 4 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=0, cursor=4",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'viw' at end of word", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 4, Line: 0})
		sendKeys(tm, "v", "i", "w")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 0 || m.ActiveWindow().Cursor.Col != 4 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=0, cursor=4",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'viw' on underscore word", func(t *testing.T) {
		lines := []string{"hello_world test"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 7, Line: 0})
		sendKeys(tm, "v", "i", "w")

		m := getFinalModel(t, tm)
		// Should select "hello_world" (cols 0-10)
		if m.ActiveWindow().Anchor.Col != 0 || m.ActiveWindow().Cursor.Col != 10 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=0, cursor=10",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'viw' on punctuation", func(t *testing.T) {
		lines := []string{"foo-bar baz"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", "w")

		m := getFinalModel(t, tm)
		// Should select just "-" (col 3)
		if m.ActiveWindow().Anchor.Col != 3 || m.ActiveWindow().Cursor.Col != 3 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=3, cursor=3",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})
}

func TestTextObjectAroundWord(t *testing.T) {
	t.Run("test 'vaw' selects around word with trailing space", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "v", "a", "w")

		m := getFinalModel(t, tm)
		// Should select "hello " (cols 0-5, includes trailing space)
		if m.ActiveWindow().Anchor.Col != 0 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=0, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'daw' deletes around word", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "d", "a", "w")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "world" {
			t.Errorf("lines[0] = %q, want 'world'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'daw' on last word (no trailing space)", func(t *testing.T) {
		lines := []string{"hello world"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 7, Line: 0})
		sendKeys(tm, "d", "a", "w")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "hello " {
			t.Errorf("lines[0] = %q, want 'hello '", m.ActiveBuffer().Lines[0])
		}
	})
}

// ============================================================================
// WORD Text Object Tests (iW/aW)
// ============================================================================

func TestTextObjectInnerWORD(t *testing.T) {
	t.Run("test 'viW' selects inner WORD", func(t *testing.T) {
		lines := []string{"foo-bar baz"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "v", "i", "W")

		m := getFinalModel(t, tm)
		// Should select "foo-bar" (cols 0-6)
		if m.ActiveWindow().Anchor.Col != 0 || m.ActiveWindow().Cursor.Col != 6 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=0, cursor=6",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'diW' deletes inner WORD", func(t *testing.T) {
		lines := []string{"foo-bar.baz test"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 5, Line: 0})
		sendKeys(tm, "d", "i", "W")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != " test" {
			t.Errorf("lines[0] = %q, want ' test'", m.ActiveBuffer().Lines[0])
		}
	})
}

func TestTextObjectAroundWORD(t *testing.T) {
	t.Run("test 'vaW' selects around WORD with trailing space", func(t *testing.T) {
		lines := []string{"foo-bar baz"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "v", "a", "W")

		m := getFinalModel(t, tm)
		// Should select "foo-bar " (cols 0-7, includes trailing space)
		if m.ActiveWindow().Anchor.Col != 0 || m.ActiveWindow().Cursor.Col != 7 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=0, cursor=7",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'daW' deletes around WORD", func(t *testing.T) {
		lines := []string{"foo-bar baz"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 2, Line: 0})
		sendKeys(tm, "d", "a", "W")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "baz" {
			t.Errorf("lines[0] = %q, want 'baz'", m.ActiveBuffer().Lines[0])
		}
	})
}

// ============================================================================
// Delimiter Text Object Tests (i</a<, i(/a(, etc.)
// ============================================================================

func TestTextObjectAngleBrackets(t *testing.T) {
	t.Run("test 'vi<' selects inner angle brackets", func(t *testing.T) {
		lines := []string{"<hello>"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", "<")

		m := getFinalModel(t, tm)
		// Should select "hello" (cols 1-5)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'vi>' works same as 'vi<'", func(t *testing.T) {
		lines := []string{"<hello>"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", ">")

		m := getFinalModel(t, tm)
		// Should select "hello" (cols 1-5)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'di<' deletes inner angle brackets", func(t *testing.T) {
		lines := []string{"<hello>"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "i", "<")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "<>" {
			t.Errorf("lines[0] = %q, want '<>'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'da<' deletes around angle brackets", func(t *testing.T) {
		lines := []string{"<hello>"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "a", "<")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "" {
			t.Errorf("lines[0] = %q, want ''", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'vi<' on empty brackets does nothing", func(t *testing.T) {
		lines := []string{"<>"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 0, Line: 0})
		sendKeys(tm, "d", "i", "<")

		m := getFinalModel(t, tm)
		// Should remain unchanged
		if m.ActiveBuffer().Lines[0] != "<>" {
			t.Errorf("lines[0] = %q, want '<>'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'vi<' in nested brackets", func(t *testing.T) {
		lines := []string{"<foo<bar>>"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 5, Line: 0})
		sendKeys(tm, "v", "i", "<")

		m := getFinalModel(t, tm)
		// Should select "bar" (cols 5-7, the innermost pair)
		if m.ActiveWindow().Anchor.Col != 5 || m.ActiveWindow().Cursor.Col != 7 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=5, cursor=7",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})
}

func TestTextObjectParentheses(t *testing.T) {
	t.Run("test 'vi(' selects inner parentheses", func(t *testing.T) {
		lines := []string{"(hello)"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", "(")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'vi)' works same as 'vi('", func(t *testing.T) {
		lines := []string{"(hello)"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", ")")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'di(' deletes inner parentheses", func(t *testing.T) {
		lines := []string{"func(hello)"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 7, Line: 0})
		sendKeys(tm, "d", "i", "(")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "func()" {
			t.Errorf("lines[0] = %q, want 'func()'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'da(' deletes around parentheses", func(t *testing.T) {
		lines := []string{"func(hello)"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 7, Line: 0})
		sendKeys(tm, "d", "a", "(")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "func" {
			t.Errorf("lines[0] = %q, want 'func'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'vi(' on empty parens does nothing", func(t *testing.T) {
		lines := []string{"()"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 0, Line: 0})
		sendKeys(tm, "d", "i", "(")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "()" {
			t.Errorf("lines[0] = %q, want '()'", m.ActiveBuffer().Lines[0])
		}
	})
}

func TestTextObjectBraces(t *testing.T) {
	t.Run("test 'vi{' selects inner braces", func(t *testing.T) {
		lines := []string{"{hello}"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", "{")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'di{' deletes inner braces", func(t *testing.T) {
		lines := []string{"{hello}"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "i", "{")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "{}" {
			t.Errorf("lines[0] = %q, want '{}'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'da{' deletes around braces", func(t *testing.T) {
		lines := []string{"{hello}"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "a", "{")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "" {
			t.Errorf("lines[0] = %q, want ''", m.ActiveBuffer().Lines[0])
		}
	})
}

func TestTextObjectBrackets(t *testing.T) {
	t.Run("test 'vi[' selects inner brackets", func(t *testing.T) {
		lines := []string{"[hello]"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", "[")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'di[' deletes inner brackets", func(t *testing.T) {
		lines := []string{"[hello]"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "i", "[")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "[]" {
			t.Errorf("lines[0] = %q, want '[]'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'da[' deletes around brackets", func(t *testing.T) {
		lines := []string{"[hello]"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "a", "[")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "" {
			t.Errorf("lines[0] = %q, want ''", m.ActiveBuffer().Lines[0])
		}
	})
}

func TestTextObjectDoubleQuotes(t *testing.T) {
	t.Run("test 'vi\"' selects inner double quotes", func(t *testing.T) {
		lines := []string{`"hello"`}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", `"`)

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'di\"' deletes inner double quotes", func(t *testing.T) {
		lines := []string{`"hello"`}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "i", `"`)

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != `""` {
			t.Errorf("lines[0] = %q, want '\"\"'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'da\"' deletes around double quotes", func(t *testing.T) {
		lines := []string{`"hello"`}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "a", `"`)

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "" {
			t.Errorf("lines[0] = %q, want ''", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'vi\"' on empty quotes does nothing", func(t *testing.T) {
		lines := []string{`""`}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 0, Line: 0})
		sendKeys(tm, "d", "i", `"`)

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != `""` {
			t.Errorf("lines[0] = %q, want '\"\"'", m.ActiveBuffer().Lines[0])
		}
	})
}

func TestTextObjectSingleQuotes(t *testing.T) {
	t.Run("test 'vi'' selects inner single quotes", func(t *testing.T) {
		lines := []string{"'hello'"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", "'")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'di'' deletes inner single quotes", func(t *testing.T) {
		lines := []string{"'hello'"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "i", "'")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "''" {
			t.Errorf("lines[0] = %q, want \"''\"", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'da'' deletes around single quotes", func(t *testing.T) {
		lines := []string{"'hello'"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "a", "'")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "" {
			t.Errorf("lines[0] = %q, want ''", m.ActiveBuffer().Lines[0])
		}
	})
}

func TestTextObjectBackticks(t *testing.T) {
	t.Run("test 'vi`' selects inner backticks", func(t *testing.T) {
		lines := []string{"`hello`"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "v", "i", "`")

		m := getFinalModel(t, tm)
		if m.ActiveWindow().Anchor.Col != 1 || m.ActiveWindow().Cursor.Col != 5 {
			t.Errorf("anchor=%d, cursor=%d, want anchor=1, cursor=5",
				m.ActiveWindow().Anchor.Col, m.ActiveWindow().Cursor.Col)
		}
	})

	t.Run("test 'di`' deletes inner backticks", func(t *testing.T) {
		lines := []string{"`hello`"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "i", "`")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "``" {
			t.Errorf("lines[0] = %q, want '``'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'da`' deletes around backticks", func(t *testing.T) {
		lines := []string{"`hello`"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "d", "a", "`")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "" {
			t.Errorf("lines[0] = %q, want ''", m.ActiveBuffer().Lines[0])
		}
	})
}

// ============================================================================
// Edge Cases and Complex Scenarios
// ============================================================================

func TestTextObjectEdgeCases(t *testing.T) {
	t.Run("test 'diw' on single character word", func(t *testing.T) {
		lines := []string{"a b c"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 0, Line: 0})
		sendKeys(tm, "d", "i", "w")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != " b c" {
			t.Errorf("lines[0] = %q, want ' b c'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'ci<' then type replacement", func(t *testing.T) {
		lines := []string{"<hello>"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 3, Line: 0})
		sendKeys(tm, "c", "i", "<")
		sendKeyString(tm, "world")
		sendKeys(tm, "esc")

		m := getFinalModel(t, tm)
		if m.ActiveBuffer().Lines[0] != "<world>" {
			t.Errorf("lines[0] = %q, want '<world>'", m.ActiveBuffer().Lines[0])
		}
	})

	t.Run("test 'yi(' then paste", func(t *testing.T) {
		lines := []string{"func(arg)", "test"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 6, Line: 0})
		sendKeys(tm, "y", "i", "(")
		sendKeys(tm, "j", "p")

		m := getFinalModel(t, tm)
		// 'p' pastes after cursor, so "arg" is pasted after 't' -> "testarg"
		if m.ActiveBuffer().Lines[1] != "testarg" {
			t.Errorf("lines[1] = %q, want 'testarg'", m.ActiveBuffer().Lines[1])
		}
	})

	t.Run("test text object cursor outside delimiters does nothing", func(t *testing.T) {
		lines := []string{"before (hello) after"}
		tm := newTestModelWithLinesAndCursorPos(t, lines, core.Position{Col: 0, Line: 0})
		sendKeys(tm, "d", "i", "(")

		m := getFinalModel(t, tm)
		// Should remain unchanged since cursor is not inside parens
		if m.ActiveBuffer().Lines[0] != "before (hello) after" {
			t.Errorf("lines[0] = %q, want 'before (hello) after'", m.ActiveBuffer().Lines[0])
		}
	})
}