// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
// SPDX-License-Identifier: GPL-3.0-or-later

package preferences

import (
	"fmt"
	"reflect"
	"strings"
	"testing"

	"git.stormux.org/storm/cthulhu/internal/config"
)

func TestWineValuesRoundTripAndOwnership(t *testing.T) {
	settings := config.DefaultSettings()
	settings.Wine = config.WineSettings{ControllerOnly: true, ExcludedPrograms: []string{"Game.exe", "Another Game.exe"}}
	values := FromSettings(settings)
	if !reflect.DeepEqual(values.Wine, settings.Wine) {
		t.Fatalf("Wine values = %+v", values.Wine)
	}
	values.Wine.ExcludedPrograms[0] = "Changed.exe"
	if settings.Wine.ExcludedPrograms[0] != "Game.exe" {
		t.Fatal("FromSettings aliases the Wine program list")
	}
	values.Wine.ExcludedPrograms[0] = "Game.exe"
	values.Wine.ControllerOnly = false
	values.Wine.ExcludedPrograms = append(values.Wine.ExcludedPrograms, "New Game.exe")
	merged, err := values.Merge(settings)
	if err != nil {
		t.Fatal(err)
	}
	if got := FromSettings(merged); !reflect.DeepEqual(got, values) {
		t.Fatalf("Wine values did not round trip:\n got %+v\nwant %+v", got.Wine, values.Wine)
	}
	values.Wine.ExcludedPrograms[0] = "Changed.exe"
	if merged.Wine.ExcludedPrograms[0] != "Game.exe" {
		t.Fatal("merged Wine programs alias the UI values")
	}
}

func TestWineValuesMergeCollapsesCaseInsensitiveDuplicates(t *testing.T) {
	settings := config.DefaultSettings()
	values := FromSettings(settings)
	values.Wine.ExcludedPrograms = []string{"Game.exe", "game.EXE", "Other.exe", "GAME.exe", "other.exe"}
	merged, err := values.Merge(settings)
	if err != nil {
		t.Fatal(err)
	}
	want := []string{"Game.exe", "Other.exe"}
	if !reflect.DeepEqual(merged.Wine.ExcludedPrograms, want) {
		t.Fatalf("collapsed Wine programs = %q, want %q", merged.Wine.ExcludedPrograms, want)
	}
	values.Wine.ExcludedPrograms = nil
	merged, err = values.Merge(settings)
	if err != nil {
		t.Fatal(err)
	}
	if merged.Wine.ExcludedPrograms != nil {
		t.Fatalf("empty Wine list became %q, want nil", merged.Wine.ExcludedPrograms)
	}
}

func TestWineValuesMergeRejectsInvalidEntriesByName(t *testing.T) {
	overlong := strings.Repeat("a", 252) + ".exe"
	cases := []struct {
		name    string
		entry   string
		wantSub string
	}{
		{name: "windows path", entry: `C:\Games\Game.exe`, wantSub: `C:\Games\Game.exe`},
		{name: "unix path", entry: "Games/Game.exe", wantSub: "Games/Game.exe"},
		{name: "blank", entry: "", wantSub: "blank"},
		{name: "spaces only", entry: "   ", wantSub: "blank"},
		{name: "overlong", entry: overlong, wantSub: overlong},
		{name: "leading space", entry: " Game.exe", wantSub: "Game.exe"},
		{name: "trailing space", entry: "Game.exe ", wantSub: "Game.exe"},
	}
	for _, test := range cases {
		t.Run(test.name, func(t *testing.T) {
			settings := config.DefaultSettings()
			settings.Wine.ExcludedPrograms = []string{"Kept.exe"}
			values := FromSettings(settings)
			values.Wine.ExcludedPrograms = []string{"Kept.exe", test.entry}
			merged, err := values.Merge(settings)
			if err == nil {
				t.Fatalf("Merge accepted Wine entry %q", test.entry)
			}
			if !strings.Contains(err.Error(), test.wantSub) {
				t.Fatalf("Merge error %q does not name %q", err, test.wantSub)
			}
			if !reflect.DeepEqual(merged.Wine.ExcludedPrograms, []string{"Kept.exe"}) {
				t.Fatalf("rejected Merge changed Wine programs to %q", merged.Wine.ExcludedPrograms)
			}
		})
	}
}

func TestWineValuesRejectEmbeddedControlCharacters(t *testing.T) {
	for character := rune(0); character < ' '; character++ {
		t.Run(fmt.Sprintf("U+%04X", character), func(t *testing.T) {
			settings := config.DefaultSettings()
			settings.Wine.ExcludedPrograms = []string{"Kept.exe"}
			values := FromSettings(settings)
			entry := "Game" + string(character) + ".exe"
			values.Wine.ExcludedPrograms = []string{entry}
			merged, err := values.Merge(settings)
			if err == nil || !strings.Contains(err.Error(), entry) {
				t.Fatalf("invalid entry was not named and rejected: %v", err)
			}
			if !reflect.DeepEqual(merged.Wine, settings.Wine) {
				t.Fatalf("rejected entry changed Wine settings: %+v", merged.Wine)
			}
		})
	}
}