//
//  PreferenceValueTests.swift
//
//  Copyright 2026 Brendan Szymanski <hello@bscubed.dev>
//
//  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/>.
//
//  SPDX-License-Identifier: GPL-3.0-or-later
//

import Foundation
import Testing

@testable import LuminateCore

/// Verifies typed conversions at the preference storage boundary.
@Suite struct PreferenceValueTests {
    @Test("Boolean decoding accepts only zero and one")
    func booleanDecoding() {
        #expect(Bool(preference: .integer(0)) == false)
        #expect(Bool(preference: .integer(1)) == true)
        #expect(Bool(preference: .integer(2)) == nil)
    }

    @Test("Double decoding accepts integer storage")
    func doubleIntegerDecoding() {
        #expect(Double(preference: .integer(3)) == 3.0)
    }

    @Test("Non-finite doubles encode as zero")
    func nonFiniteDoubleEncoding() {
        #expect(Double.nan.preferenceValue == .real(0))
        #expect(Double.infinity.preferenceValue == .real(0))
    }

    @Test("Boolean encoding maps to zero and one")
    func booleanEncoding() {
        #expect(true.preferenceValue == .integer(1))
        #expect(false.preferenceValue == .integer(0))
    }

    @Test("Integer decoding and encoding round trip")
    func integerRoundTrip() {
        #expect(Int(preference: .integer(7)) == 7)
        #expect(Int(preference: .text("7")) == nil)
        #expect(7.preferenceValue == .integer(7))
    }

    @Test("UUID round trips through text storage")
    func uuidRoundTrip() {
        let uuid = UUID()
        #expect(uuid.preferenceValue == .text(uuid.uuidString))
        #expect(UUID(preference: .text(uuid.uuidString)) == uuid)
        #expect(UUID(preference: .text("not-a-uuid")) == nil)
        #expect(UUID(preference: .integer(1)) == nil)
    }

    @Test("Data round trips through blob storage, including empty data")
    func dataRoundTrip() {
        #expect(Data([1, 2, 3]).preferenceValue == .blob(Data([1, 2, 3])))
        #expect(Data(preference: .blob(Data([1, 2, 3]))) == Data([1, 2, 3]))
        #expect(Data().preferenceValue == .blob(Data()))
        #expect(Data(preference: .blob(Data())) == Data())
        #expect(Data(preference: .text("x")) == nil)
    }

    @Test("A RawRepresentable conformance encodes and decodes through its raw value")
    func rawRepresentableConformance() {
        #expect(Theme.dark.preferenceValue == .text("dark"))
        #expect(Theme(preference: .text("light")) == .light)
        #expect(Theme(preference: .text("plaid")) == nil)
    }
}

private enum Theme: String, PreferenceValue {
    case light, dark
}