// A paste from the terminal: collected between its two marks and handed to
// the window in front whole, or replayed as the keys it came as.

package app

import (
	"strings"

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

// handlePaste marks the start and end of a bracketed paste from the terminal.
//
// tcell sends the pasted text as ordinary keys between the two marks, so
// handleKey collects them while a paste is on, and the end mark decides
// where the whole goes. An agent window in front gets it as one paste, which
// is what lets a long one be kept aside as a token (acp.View.Paste). Any
// other window gets the keys replayed exactly as it would have had them, so
// nothing else changes: a paste into a file is typed, as it always was.
func (a *App) handlePaste(ev *tcell.EventPaste) {
	if ev.Start() {
		a.pasting, a.pasted = true, nil
		return
	}
	keys := a.pasted
	a.pasting, a.pasted = false, nil

	if agent := a.activeAgent(); agent != nil && len(a.modals) == 0 {
		agent.view.Paste(pastedText(keys))
		return
	}
	for _, key := range keys {
		a.handleKey(key)
	}
}

// pastedText puts the keys of a bracketed paste back into the text they
// were: a rune for each character, a newline for each Enter, a tab for each
// Tab. Anything else a terminal might send inside a paste is not text.
func pastedText(keys []*tcell.EventKey) string {
	var text strings.Builder
	for _, key := range keys {
		switch key.Key() {
		case tcell.KeyRune:
			text.WriteRune(key.Rune())
		case tcell.KeyEnter, tcell.KeyLF:
			text.WriteByte('\n')
		case tcell.KeyTab:
			text.WriteByte('\t')
		}
	}
	return text.String()
}