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package app

import (
	"strings"
	"testing"

	"github.com/gdamore/tcell/v2"
)

// pasteKeys sends text as a terminal's bracketed paste would: a start mark,
// the characters as keys with Enter for each newline, an end mark.
func pasteKeys(a *App, text string) {
	a.handle(tcell.NewEventPaste(true))
	for _, r := range text {
		if r == '\n' {
			a.handle(tcell.NewEventKey(tcell.KeyEnter, 0, tcell.ModNone))
			continue
		}
		a.handle(tcell.NewEventKey(tcell.KeyRune, r, tcell.ModNone))
	}
	a.handle(tcell.NewEventPaste(false))
}

func TestABracketedPasteReachesAnAgentWindowWhole(t *testing.T) {
	// Key by key, the two Enters would each have sent a prompt; whole, the
	// three lines are one paste, kept aside as a token.
	a, _ := newAgentsApp(t, "[[agent]]\nname=\"Echo\"\ncommand=\"cat\"\n")
	a.NewAgent("Echo")
	agent := a.activeAgent()
	if agent == nil {
		t.Fatal("no agent window is in front")
	}

	pasteKeys(a, "one\ntwo\nthree")

	if got := agent.view.Input(); got != "[Pasted #1 · 3 lines · 13 chars]" {
		t.Errorf("the box holds %q", got)
	}
	if entries := agent.session.Entries(); len(entries) != 0 {
		t.Errorf("%d prompt(s) were sent by the newlines inside the paste", len(entries))
	}
}

func TestABracketedPasteIntoAFileIsTypedAsBefore(t *testing.T) {
	a, _ := newTestApp(t)
	a.NewFile()

	pasteKeys(a, "ab")

	if got := a.activeView().Buffer().Text(); got != "ab" {
		t.Errorf("the file holds %q after a paste, want %q", got, "ab")
	}
}

func TestKeysAreNotLostWhenAPasteIsCancelledByAnotherWindow(t *testing.T) {
	// The paste starts in an agent window; nothing else in the editor sees
	// its keys until it ends — so a key layer cannot half-act on them.
	a, _ := newAgentsApp(t, "[[agent]]\nname=\"Echo\"\ncommand=\"cat\"\n")
	a.NewAgent("Echo")

	a.handle(tcell.NewEventPaste(true))
	a.handle(tcell.NewEventKey(tcell.KeyF4, 0, tcell.ModNone)) // New file, were it a keystroke
	a.handle(tcell.NewEventPaste(false))

	if len(a.desktop.Windows()) != 1 {
		t.Errorf("%d windows are open: a key inside a paste acted as a shortcut", len(a.desktop.Windows()))
	}
}

func TestEditPasteGoesIntoTheAgentBox(t *testing.T) {
	a, _ := newAgentsApp(t, "[[agent]]\nname=\"Echo\"\ncommand=\"cat\"\n")
	a.NewAgent("Echo")
	a.clipboard.SetText("from a file\nin the editor\n")

	a.Paste()

	if got := a.activeAgent().view.Input(); !strings.HasPrefix(got, "[Pasted #1 · 2 lines") {
		t.Errorf("the box holds %q after Edit ▸ Paste", got)
	}
}

func TestCtrlVInAnAgentWindowPastesTheEditorsClipboard(t *testing.T) {
	a, _ := newAgentsApp(t, "[[agent]]\nname=\"Echo\"\ncommand=\"cat\"\n")
	a.NewAgent("Echo")
	a.clipboard.SetText("buildMenus")

	press(a, tcell.KeyCtrlV, 0, tcell.ModNone)

	if got := a.activeAgent().view.Input(); got != "buildMenus" {
		t.Errorf("the box holds %q after Ctrl-V", got)
	}
}