package tui

import (
	"fmt"
	"strings"

	"proxyctl/internal/app"
)

type confirmationResult uint8

const (
	confirmationPending confirmationResult = iota
	confirmationAccepted
	confirmationCancelled
)

// confirmationDialog is the reusable safe-default interaction used for
// destructive Profile deletion and Application-requested confirmations.
// confirmFocused is deliberately false in every new dialog.
type confirmationDialog struct {
	request        app.Confirmation
	confirmFocused bool
	offset         int
}

func newConfirmationDialog(request app.Confirmation) confirmationDialog {
	return confirmationDialog{request: request}
}

func (d *confirmationDialog) update(key string) confirmationResult {
	switch key {
	case "pgup":
		d.offset = max(0, d.offset-5)
	case "pgdown":
		d.offset += 5
	case "home":
		d.offset = 0
	case "end":
		d.offset = 1 << 20
	case "left", "right", "tab", "shift+tab":
		d.confirmFocused = !d.confirmFocused
	case "y":
		return confirmationAccepted
	case "n", "esc", "q":
		return confirmationCancelled
	case "enter":
		if d.confirmFocused {
			return confirmationAccepted
		}
		return confirmationCancelled
	}
	return confirmationPending
}

func (d confirmationDialog) view() string {
	confirmLabel := d.request.ConfirmLabel
	if confirmLabel == "" {
		confirmLabel = "Confirm"
	}
	cancelLabel := d.request.CancelLabel
	if cancelLabel == "" {
		cancelLabel = "Cancel"
	}
	confirm, cancel := "  "+confirmLabel, "> "+cancelLabel
	if d.confirmFocused {
		confirm, cancel = "> "+confirmLabel, "  "+cancelLabel
	}

	var body strings.Builder
	body.WriteString(d.request.Title)
	if d.request.Summary != "" {
		fmt.Fprintf(&body, "\n%s", d.request.Summary)
	}
	for _, detail := range d.request.Details {
		fmt.Fprintf(&body, "\n• %s", detail)
	}
	fmt.Fprintf(&body, "\n\n%s    %s", cancel, confirm)
	return body.String()
}