//
//  DatabaseManagerTests.swift
//  RSSuperTests
//
//  Created on 3/29/26.
//

import XCTest
@testable import RSSuper

final class DatabaseManagerTests: XCTestCase {
    
    private var databaseManager: DatabaseManager!
    private var testSubscriptionId: String!
    
    override func setUp() {
        super.setUp()
        databaseManager = DatabaseManager.shared
        testSubscriptionId = UUID().uuidString
        
        // Clean up any existing test data
        try? databaseManager.deleteSubscription(id: testSubscriptionId)
    }
    
    override func tearDown() {
        // Clean up test data
        try? databaseManager.deleteSubscription(id: testSubscriptionId)
        databaseManager = nil
        super.tearDown()
    }
    
    // MARK: - Subscription CRUD Tests
    
    func testCreateSubscription() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com/feed.xml",
            title: "Test Subscription",
            category: "Technology",
            enabled: true,
            fetchInterval: 3600
        )
        
        XCTAssertEqual(subscription.id, testSubscriptionId)
        XCTAssertEqual(subscription.url, "https://example.com/feed.xml")
        XCTAssertEqual(subscription.title, "Test Subscription")
        XCTAssertEqual(subscription.category, "Technology")
        XCTAssertTrue(subscription.enabled)
        XCTAssertEqual(subscription.fetchInterval, 3600)
    }
    
    func testFetchSubscription() throws {
        // Create first
        _ = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com/feed.xml",
            title: "Test Subscription"
        )
        
        // Fetch
        let fetched = try databaseManager.fetchSubscription(id: testSubscriptionId)
        
        XCTAssertNotNil(fetched)
        XCTAssertEqual(fetched?.id, testSubscriptionId)
        XCTAssertEqual(fetched?.title, "Test Subscription")
    }
    
    func testFetchSubscriptionNotFound() throws {
        let fetched = try databaseManager.fetchSubscription(id: "non-existent-id")
        XCTAssertNil(fetched)
    }
    
    func testFetchAllSubscriptions() throws {
        let id1 = UUID().uuidString
        let id2 = UUID().uuidString
        
        try databaseManager.createSubscription(id: id1, url: "https://example1.com", title: "Sub 1")
        try databaseManager.createSubscription(id: id2, url: "https://example2.com", title: "Sub 2")
        
        let subscriptions = try databaseManager.fetchAllSubscriptions()
        
        XCTAssertGreaterThanOrEqual(subscriptions.count, 2)
        
        // Cleanup
        try databaseManager.deleteSubscription(id: id1)
        try databaseManager.deleteSubscription(id: id2)
    }
    
    func testFetchEnabledSubscriptions() throws {
        let id1 = UUID().uuidString
        let id2 = UUID().uuidString
        
        try databaseManager.createSubscription(id: id1, url: "https://example1.com", title: "Sub 1", enabled: true)
        try databaseManager.createSubscription(id: id2, url: "https://example2.com", title: "Sub 2", enabled: false)
        
        let subscriptions = try databaseManager.fetchEnabledSubscriptions()
        
        XCTAssertTrue(subscriptions.allSatisfy { $0.enabled })
        
        // Cleanup
        try databaseManager.deleteSubscription(id: id1)
        try databaseManager.deleteSubscription(id: id2)
    }
    
    func testUpdateSubscription() throws {
        _ = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Original Title"
        )
        
        let updated = try databaseManager.updateSubscription(
            try databaseManager.fetchSubscription(id: testSubscriptionId)!,
            title: "Updated Title",
            enabled: false
        )
        
        XCTAssertEqual(updated.title, "Updated Title")
        XCTAssertFalse(updated.enabled)
    }
    
    func testDeleteSubscription() throws {
        _ = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "To Delete"
        )
        
        try databaseManager.deleteSubscription(id: testSubscriptionId)
        
        let fetched = try databaseManager.fetchSubscription(id: testSubscriptionId)
        XCTAssertNil(fetched)
    }
    
    // MARK: - FeedItem CRUD Tests
    
    func testCreateFeedItem() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let item = FeedItem(
            id: UUID().uuidString,
            title: "Test Article",
            link: "https://example.com/article",
            description: "Article description",
            content: "Full article content",
            author: "John Doe",
            published: Date(),
            subscriptionId: subscription.id,
            subscriptionTitle: subscription.title
        )
        
        let created = try databaseManager.createFeedItem(item)
        
        XCTAssertEqual(created.id, item.id)
        XCTAssertEqual(created.title, "Test Article")
        XCTAssertEqual(created.subscriptionId, testSubscriptionId)
    }
    
    func testFetchFeedItem() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let itemId = UUID().uuidString
        let item = FeedItem(
            id: itemId,
            title: "To Fetch",
            subscriptionId: subscription.id
        )
        _ = try databaseManager.createFeedItem(item)
        
        let fetched = try databaseManager.fetchFeedItem(id: itemId)
        
        XCTAssertNotNil(fetched)
        XCTAssertEqual(fetched?.id, itemId)
    }
    
    func testFetchFeedItemsForSubscription() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        for i in 1...3 {
            let item = FeedItem(
                id: UUID().uuidString,
                title: "Article \(i)",
                subscriptionId: subscription.id
            )
            _ = try databaseManager.createFeedItem(item)
        }
        
        let items = try databaseManager.fetchFeedItems(for: testSubscriptionId)
        
        XCTAssertEqual(items.count, 3)
    }
    
    func testFetchUnreadFeedItems() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let readItem = FeedItem(id: UUID().uuidString, title: "Read", subscriptionId: subscription.id, read: true)
        let unreadItem = FeedItem(id: UUID().uuidString, title: "Unread", subscriptionId: subscription.id, read: false)
        
        _ = try databaseManager.createFeedItem(readItem)
        _ = try databaseManager.createFeedItem(unreadItem)
        
        let unreadItems = try databaseManager.fetchUnreadFeedItems()
        
        XCTAssertTrue(unreadItems.allSatisfy { !$0.read })
    }
    
    func testMarkAsRead() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let item1 = FeedItem(id: UUID().uuidString, title: "Item 1", subscriptionId: subscription.id, read: false)
        let item2 = FeedItem(id: UUID().uuidString, title: "Item 2", subscriptionId: subscription.id, read: false)
        
        _ = try databaseManager.createFeedItem(item1)
        _ = try databaseManager.createFeedItem(item2)
        
        try databaseManager.markAsRead(ids: [item1.id, item2.id])
        
        let fetched1 = try databaseManager.fetchFeedItem(id: item1.id)
        let fetched2 = try databaseManager.fetchFeedItem(id: item2.id)
        
        XCTAssertTrue(fetched1?.read ?? false)
        XCTAssertTrue(fetched2?.read ?? false)
    }
    
    func testDeleteFeedItem() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let item = FeedItem(id: UUID().uuidString, title: "To Delete", subscriptionId: subscription.id)
        _ = try databaseManager.createFeedItem(item)
        
        try databaseManager.deleteFeedItem(id: item.id)
        
        let fetched = try databaseManager.fetchFeedItem(id: item.id)
        XCTAssertNil(fetched)
    }
    
    // MARK: - SearchHistory Tests
    
    func testAddToSearchHistory() throws {
        let item = try databaseManager.addToSearchHistory(query: "test query")
        
        XCTAssertEqual(item.query, "test query")
        XCTAssertNotNil(item.id)
    }
    
    func testFetchSearchHistory() throws {
        try databaseManager.addToSearchHistory(query: "Query 1")
        try databaseManager.addToSearchHistory(query: "Query 2")
        
        let history = try databaseManager.fetchSearchHistory()
        
        XCTAssertGreaterThanOrEqual(history.count, 2)
    }
    
    func testClearSearchHistory() throws {
        try databaseManager.addToSearchHistory(query: "To Clear")
        try databaseManager.clearSearchHistory()
        
        let history = try databaseManager.fetchSearchHistory()
        XCTAssertTrue(history.isEmpty)
    }
    
    // MARK: - FTS Search Tests
    
    func testFullTextSearch() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let searchableItem = FeedItem(
            id: UUID().uuidString,
            title: "Unique Title for Search Test",
            description: "This has special content",
            subscriptionId: subscription.id
        )
        let nonMatchingItem = FeedItem(
            id: UUID().uuidString,
            title: "Completely Different",
            subscriptionId: subscription.id
        )
        
        _ = try databaseManager.createFeedItem(searchableItem)
        _ = try databaseManager.createFeedItem(nonMatchingItem)
        
        let results = try databaseManager.fullTextSearch(query: "Unique")
        
        XCTAssertTrue(results.contains { $0.id == searchableItem.id || $0.title.contains("Unique") })
        XCTAssertFalse(results.contains { $0.id == nonMatchingItem.id })
    }
    
    func testAdvancedSearch() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let item1 = FeedItem(
            id: UUID().uuidString,
            title: "Searchable Title",
            author: "Test Author",
            subscriptionId: subscription.id
        )
        let item2 = FeedItem(
            id: UUID().uuidString,
            title: "Different Title",
            author: "Other Author",
            subscriptionId: subscription.id
        )
        
        _ = try databaseManager.createFeedItem(item1)
        _ = try databaseManager.createFeedItem(item2)
        
        let results = try databaseManager.advancedSearch(title: "Searchable", author: "Test")
        
        XCTAssertTrue(results.contains { $0.id == item1.id })
        XCTAssertFalse(results.contains { $0.id == item2.id })
    }
    
    // MARK: - Batch Operations Tests
    
    func testMarkAllAsRead() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        _ = try databaseManager.createFeedItem(FeedItem(id: UUID().uuidString, title: "Item 1", subscriptionId: subscription.id, read: false))
        _ = try databaseManager.createFeedItem(FeedItem(id: UUID().uuidString, title: "Item 2", subscriptionId: subscription.id, read: false))
        
        try databaseManager.markAllAsRead(for: testSubscriptionId)
        
        let items = try databaseManager.fetchFeedItems(for: testSubscriptionId)
        XCTAssertTrue(items.allSatisfy { $0.read })
    }
    
    func testCleanupOldItems() throws {
        let subscription = try databaseManager.createSubscription(
            id: testSubscriptionId,
            url: "https://example.com",
            title: "Test Sub"
        )
        
        let oldItem = FeedItem(
            id: UUID().uuidString,
            title: "Old Item",
            published: Calendar.current.date(byAdding: .day, value: -30, to: Date()),
            subscriptionId: subscription.id
        )
        let newItem = FeedItem(
            id: UUID().uuidString,
            title: "New Item",
            published: Date(),
            subscriptionId: subscription.id
        )
        
        _ = try databaseManager.createFeedItem(oldItem)
        _ = try databaseManager.createFeedItem(newItem)
        
        let deletedCount = try databaseManager.cleanupOldItems(olderThan: 7, for: testSubscriptionId)
        
        XCTAssertEqual(deletedCount, 1)
        
        let remainingItems = try databaseManager.fetchFeedItems(for: testSubscriptionId)
        XCTAssertEqual(remainingItems.count, 1)
        XCTAssertEqual(remainingItems.first?.id, newItem.id)
    }
}