// 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 (
	"math"
	"testing"
)

func TestInvalidNumberUpDownStepRejected(t *testing.T) {
	for _, step := range []float64{-1, math.NaN(), math.Inf(1), math.Inf(-1)} {
		form := test_form()
		form.Tabs[0].Controls[1].UpDownStep = step
		if _, err := New_session(form); err == nil {
			t.Fatalf("invalid Up/Down step %v accepted", step)
		}
	}
}

func test_form() Form {
	return Form{Type: TabForm, Title: "Settings", Tabs: []Tab{
		{ID: "speech", Label: "Speech", Controls: []Control{
			{ID: "enabled", Label: "Speech enabled", Kind: CheckBox, Checked: true},
			{ID: "range", Label: "Range", Kind: Number, Number: 2.5, Min: -5, Max: 5, Step: 0.1},
			{ID: "text", Label: "Text", Kind: Entry, Text: "a界c"},
			{ID: "ok", Label: "OK", Kind: Button, Action: "save"},
			{ID: "cancel", Label: "Cancel", Kind: Button, Action: "cancel"},
		}},
		{ID: "sound", Label: "Sound"},
	}}
}

func TestTabFormTraversalControlsAndIsolation(t *testing.T) {
	form := test_form()
	session, err := New_session(form)
	if err != nil {
		t.Fatal(err)
	}
	if session.Open() != "Settings. Speech tab" {
		t.Fatal(session.Open())
	}
	for _, name := range []string{"right", "left", "down", "up"} {
		result := session.Handle(Key{Name: name})
		if result.Speech == "" {
			t.Fatal("silent tab", name)
		}
	}
	if session.Describe() != "Speech tab" {
		t.Fatal(session.Describe())
	}
	if got := session.Handle(Key{Name: "tab"}).Speech; got != "Speech enabled checked" {
		t.Fatal(got)
	}
	if got := session.Handle(Key{Name: "space"}).Speech; got != "Speech enabled unchecked" {
		t.Fatal(got)
	}
	if !form.Tabs[0].Controls[0].Checked {
		t.Fatal("form mutated outside session")
	}
	session.Handle(Key{Name: "tab"})
	for _, fixture := range []struct {
		name string
		want float64
	}{
		{"up", 3.5}, {"right", 3.6}, {"left", 3.5}, {"down", 2.5},
	} {
		session.Handle(Key{Name: fixture.name})
		if got := session.Values()["speech.range"].Number; got != fixture.want {
			t.Fatal(fixture, got)
		}
	}
	for range 100 {
		session.Handle(Key{Name: "up"})
	}
	if got := session.Values()["speech.range"].Number; got != 5 {
		t.Fatal("upper bound", got)
	}
	for range 100 {
		session.Handle(Key{Name: "down"})
	}
	if got := session.Values()["speech.range"].Number; got != -5 {
		t.Fatal("lower bound", got)
	}
	session.Handle(Key{Name: "tab"})
	session.Handle(Key{Name: "home"})
	session.Handle(Key{Name: "right"})
	session.Handle(Key{Name: "delete"})
	session.Handle(Key{Text: "é"})
	if got := session.Values()["speech.text"].Text; got != "aéc" {
		t.Fatal("Unicode editing", got)
	}
	session.Handle(Key{Ctrl: true, Text: "a"})
	session.Handle(Key{Text: "replacement"})
	if got := session.Values()["speech.text"].Text; got != "replacement" {
		t.Fatal("select all", got)
	}
	if got := session.Handle(Key{Name: "tab"}).Speech; got != "OK button" {
		t.Fatal(got)
	}
	if got := session.Handle(Key{Name: "enter"}).Action; got != "save" {
		t.Fatal(got)
	}
	if got := session.Handle(Key{Name: "tab"}).Speech; got != "Cancel button" {
		t.Fatal(got)
	}
	if got := session.Handle(Key{Name: "enter"}).Action; got != "cancel" {
		t.Fatal(got)
	}
	if got := session.Handle(Key{Name: "tab"}).Speech; got != "Speech tab" {
		t.Fatal("tab cycle", got)
	}
	if got := session.Handle(Key{Name: "tab", Shift: true}).Speech; got != "Cancel button" {
		t.Fatal("reverse cycle", got)
	}
	if !session.Handle(Key{Name: "escape"}).Cancelled {
		t.Fatal("escape did not cancel")
	}
}

func TestListCategoryFormReturnsSelectionWithoutSideEffects(t *testing.T) {
	form := Form{Type: TabForm, Title: "Picker", Tabs: []Tab{{ID: "category", Label: "Category", Controls: []Control{{ID: "items", Label: "Items", Kind: List, Items: []string{"First", "Second"}, Action: "choose"}}}}}
	session, err := New_session(form)
	if err != nil {
		t.Fatal(err)
	}
	session.Handle(Key{Name: "tab"})
	if got := session.Handle(Key{Name: "up"}).Speech; got != "Second" {
		t.Fatal(got)
	}
	if got := session.Handle(Key{Name: "enter"}).Action; got != "choose" {
		t.Fatal(got)
	}
	values := session.Values()
	values["category.items"].Items[1] = "changed"
	if got := session.Describe(); got != "Items Second" {
		t.Fatal("values aliased", got)
	}
}

func TestUnknownFormTypeRejected(t *testing.T) {
	form := test_form()
	form.Type = "unknown"
	if _, err := New_session(form); err == nil {
		t.Fatal("unknown form type accepted")
	}
}