//
//  SQLitePreferenceStoreTests.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
@testable import LuminateStore

@Suite struct SQLitePreferenceStoreTests {
    @Test("A fresh database has schema version one and no preferences")
    func freshDatabase() throws {
        let (url, directory) = makeDatabaseURL()
        defer { try? FileManager.default.removeItem(at: directory) }

        let store = try SQLitePreferenceStore(url: url)
        #expect(store.initialSnapshot.isEmpty)
        let database = try SQLiteDatabase(url: url)
        #expect(try database.userVersion == 1)
    }

    @Test("Queued values survive flush and reopen")
    func persistsValue() async throws {
        let (url, directory) = makeDatabaseURL()
        defer { try? FileManager.default.removeItem(at: directory) }

        let store = try SQLitePreferenceStore(url: url)
        store.enqueue("server.url", .text("http://jellyfin.test:8096"))
        try await store.flush()

        let reopened = try SQLitePreferenceStore(url: url)
        #expect(reopened.initialSnapshot["server.url"] == .text("http://jellyfin.test:8096"))
    }

    @Test("A nil queued value deletes the stored row")
    func deletesValue() async throws {
        let (url, directory) = makeDatabaseURL()
        defer { try? FileManager.default.removeItem(at: directory) }

        let store = try SQLitePreferenceStore(url: url)
        store.enqueue("auth.accessToken", .text("secret"))
        store.enqueue("auth.accessToken", nil)
        try await store.flush()

        let reopened = try SQLitePreferenceStore(url: url)
        #expect(reopened.initialSnapshot["auth.accessToken"] == nil)
    }

    @Test("Every SQLite storage class round trips")
    func storageClassesRoundTrip() async throws {
        let (url, directory) = makeDatabaseURL()
        defer { try? FileManager.default.removeItem(at: directory) }

        let store = try SQLitePreferenceStore(url: url)
        let values: [String: StoredPreference] = [
            "integer": .integer(42),
            "real": .real(3.5),
            "text": .text("value"),
            "blob": .blob(Data([1, 2, 3])),
            "emptyBlob": .blob(Data()),
            "nulText": .text("a\0b"),
        ]
        for (key, value) in values {
            store.enqueue(key, value)
        }
        try await store.flush()

        let reopened = try SQLitePreferenceStore(url: url)
        #expect(reopened.initialSnapshot == values)
    }

    @Test("Writes to one key are applied in submission order")
    func preservesOrder() async throws {
        let (url, directory) = makeDatabaseURL()
        defer { try? FileManager.default.removeItem(at: directory) }

        let store = try SQLitePreferenceStore(url: url)
        store.enqueue("server.url", .text("first"))
        store.enqueue("server.url", .text("second"))
        try await store.flush()

        let reopened = try SQLitePreferenceStore(url: url)
        #expect(reopened.initialSnapshot["server.url"] == .text("second"))
    }

    private func makeDatabaseURL() -> (URL, URL) {
        let directory = FileManager.default.temporaryDirectory
            .appending(path: "luminate-store-\(UUID().uuidString)", directoryHint: .isDirectory)
        return (directory.appending(path: "preferences.sqlite"), directory)
    }
}