package internal

import "testing"

// TestEditTitleInput 验证编辑标题模式下的按键输入逻辑
func TestEditTitleInput(t *testing.T) {
	m := NewModel()
	m.history.Projects = []*ProjectDir{
		{DirShort: "test", Sessions: []*Session{
			{ID: "s1", AISummary: "旧标题"},
		}},
	}
	m.history.DirCursor = 2
	m.history.SessCursor = 0
	m.history.FocusPanel = 1
	m.history.Loaded = true

	// 1. 按 e 进入编辑模式
	m, _ = m.handleKey("e")
	if !m.editTitleMode {
		t.Fatal("按 e 应进入编辑模式")
	}
	if m.editTitleBuf != "旧标题" {
		t.Fatalf("编辑缓冲应预填旧标题, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 3 {
		t.Fatalf("光标应在末尾, got %d", m.editTitleCursor)
	}

	// 2. 输入英文 a
	m, _ = m.handleKey("a")
	if m.editTitleBuf != "旧标题a" {
		t.Fatalf("输入 a 应追加, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 4 {
		t.Fatalf("输入 a 后光标应在 4, got %d", m.editTitleCursor)
	}

	// 3. 空格
	m, _ = m.handleKey("space")
	if m.editTitleBuf != "旧标题a " {
		t.Fatalf("空格应插入空格, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 5 {
		t.Fatalf("空格后光标应在 5, got %d", m.editTitleCursor)
	}

	// 4. backspace 删末尾
	m, _ = m.handleKey("backspace")
	if m.editTitleBuf != "旧标题a" {
		t.Fatalf("backspace 应删末尾, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 4 {
		t.Fatalf("backspace 后光标应在 4, got %d", m.editTitleCursor)
	}

	// 5. 输入中文 新
	m, _ = m.handleKey("新")
	if m.editTitleBuf != "旧标题a新" {
		t.Fatalf("输入中文应追加, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 5 {
		t.Fatalf("输入中文后光标应在 5, got %d", m.editTitleCursor)
	}

	// 6. 左移光标
	m, _ = m.handleKey("left")
	if m.editTitleCursor != 4 {
		t.Fatalf("左移后光标应在 4, got %d", m.editTitleCursor)
	}

	// 7. 在光标处插入
	m, _ = m.handleKey("X")
	if m.editTitleBuf != "旧标题aX新" {
		t.Fatalf("光标处插入 'X' 失败, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 5 {
		t.Fatalf("插入后光标应在 5, got %d", m.editTitleCursor)
	}

	// 8. delete 删除光标处字符
	m, _ = m.handleKey("delete")
	if m.editTitleBuf != "旧标题aX" {
		t.Fatalf("delete 应删光标处字符, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 5 {
		t.Fatalf("delete 后光标应在 5, got %d", m.editTitleCursor)
	}

	// 9. esc 取消
	m, _ = m.handleKey("esc")
	if m.editTitleMode {
		t.Fatal("esc 应退出编辑模式")
	}
	if m.editTitleBuf != "" {
		t.Fatalf("esc 应清空缓冲, got %q", m.editTitleBuf)
	}
	if m.editTitleCursor != 0 {
		t.Fatalf("esc 应重置光标, got %d", m.editTitleCursor)
	}
}