// Fenrir console screen reader.
// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.

package interaction

import (
	"strconv"

	"git.stormux.org/storm/fenrir/internal/i18n"
)

func (s *Session) Open() string { return i18n.T(s.form.Title) + ". " + s.Describe() }

func (s *Session) Describe() string {
	tab := s.form.Tabs[s.tab]
	if s.focus == -1 {
		return i18n.Format("{0} tab", i18n.T(tab.Label))
	}
	control := tab.Controls[s.focus]
	label := i18n.T(control.Label)
	switch control.Kind {
	case CheckBox:
		state := "unchecked"
		if control.Checked {
			state = "checked"
		}
		return label + " " + i18n.T(state)
	case Number:
		return label + " " + strconv.FormatFloat(control.Number, 'f', -1, 64)
	case Entry:
		return i18n.Format("{0} entry {1}", label, control.Text)
	case List:
		return label + " " + control.Items[control.Selected]
	case Grid:
		return i18n.Format("{0} grid. {1}", label, s.describe_grid(control))
	case ComboBox:
		return i18n.Format("{0} combo box {1}", label, describe_choice(control))
	case Button:
		return i18n.Format("{0} button", label)
	}
	return label
}

func describe_choice(control Control) string {
	choice := control.Choices[control.Selected]
	text := choice_label(choice)
	if choice.Unavailable != "" {
		text += ". " + i18n.T("unavailable") + ": " + choice.Unavailable
	}
	return text
}

func choice_label(choice Choice) string {
	if choice.Literal {
		return choice.Label
	}
	return i18n.T(choice.Label)
}

func (s *Session) focused_group() string {
	if s.focus < 0 {
		return ""
	}
	return s.form.Tabs[s.tab].Controls[s.focus].Group
}

func (s *Session) describe_focus(previousGroup string) string {
	if group := s.focused_group(); group != "" && group != previousGroup {
		return i18n.T(group) + ". " + s.Describe()
	}
	return s.Describe()
}