import XCTest
@testable import Kordant

final class WidgetDataTests: XCTestCase {
    // MARK: - Encoding / Decoding

    func testWidgetDataEncodingDecoding() throws {
        let original = WidgetData(
            threatScore: 0.42,
            recentAlerts: [
                WidgetAlert(
                    id: "test-1",
                    title: "Test Alert",
                    message: "Test message",
                    severity: "high",
                    type: "breach",
                    createdAt: Date()
                )
            ],
            alertCount: 1,
            unreadCount: 1,
            criticalCount: 0,
            exposureCount: 2,
            lastUpdated: Date()
        )

        let encoded = try JSONEncoder().encode(original)
        let decoded = try JSONDecoder().decode(WidgetData.self, from: encoded)

        XCTAssertEqual(original, decoded)
        XCTAssertEqual(decoded.threatScore, 0.42)
        XCTAssertEqual(decoded.alertCount, 1)
        XCTAssertEqual(decoded.unreadCount, 1)
        XCTAssertEqual(decoded.criticalCount, 0)
        XCTAssertEqual(decoded.exposureCount, 2)
        XCTAssertEqual(decoded.recentAlerts.count, 1)
        XCTAssertEqual(decoded.recentAlerts[0].id, "test-1")
        XCTAssertEqual(decoded.recentAlerts[0].title, "Test Alert")
        XCTAssertEqual(decoded.recentAlerts[0].severity, "high")
    }

    // MARK: - Threat Level

    func testThreatLevelLow() {
        let data = WidgetData(
            threatScore: 0.15,
            recentAlerts: [],
            alertCount: 0,
            unreadCount: 0,
            criticalCount: 0,
            exposureCount: 0,
            lastUpdated: Date()
        )
        XCTAssertEqual(data.threatLevel, .low)
    }

    func testThreatLevelMedium() {
        let data = WidgetData(
            threatScore: 0.25,
            recentAlerts: [],
            alertCount: 0,
            unreadCount: 0,
            criticalCount: 0,
            exposureCount: 0,
            lastUpdated: Date()
        )
        XCTAssertEqual(data.threatLevel, .medium)
    }

    func testThreatLevelHigh() {
        let data = WidgetData(
            threatScore: 0.45,
            recentAlerts: [],
            alertCount: 0,
            unreadCount: 0,
            criticalCount: 0,
            exposureCount: 0,
            lastUpdated: Date()
        )
        XCTAssertEqual(data.threatLevel, .high)
    }

    func testThreatLevelCritical() {
        let data = WidgetData(
            threatScore: 0.72,
            recentAlerts: [],
            alertCount: 0,
            unreadCount: 0,
            criticalCount: 0,
            exposureCount: 0,
            lastUpdated: Date()
        )
        XCTAssertEqual(data.threatLevel, .critical)
    }

    func testThreatLevelBoundaries() {
        // Exactly 0.2 is medium
        let mediumLow = WidgetData(threatScore: 0.2, recentAlerts: [], alertCount: 0, unreadCount: 0, criticalCount: 0, exposureCount: 0, lastUpdated: Date())
        XCTAssertEqual(mediumLow.threatLevel, .medium)

        // Exactly 0.4 is high
        let highLow = WidgetData(threatScore: 0.4, recentAlerts: [], alertCount: 0, unreadCount: 0, criticalCount: 0, exposureCount: 0, lastUpdated: Date())
        XCTAssertEqual(highLow.threatLevel, .high)

        // Exactly 0.7 is critical
        let criticalLow = WidgetData(threatScore: 0.7, recentAlerts: [], alertCount: 0, unreadCount: 0, criticalCount: 0, exposureCount: 0, lastUpdated: Date())
        XCTAssertEqual(criticalLow.threatLevel, .critical)
    }

    // MARK: - Threat Percentage

    func testThreatPercentage() {
        let data = WidgetData(threatScore: 0.35, recentAlerts: [], alertCount: 0, unreadCount: 0, criticalCount: 0, exposureCount: 0, lastUpdated: Date())
        XCTAssertEqual(data.threatPercentage, 35)

        let data2 = WidgetData(threatScore: 1.0, recentAlerts: [], alertCount: 0, unreadCount: 0, criticalCount: 0, exposureCount: 0, lastUpdated: Date())
        XCTAssertEqual(data2.threatPercentage, 100)

        let data3 = WidgetData(threatScore: 0.0, recentAlerts: [], alertCount: 0, unreadCount: 0, criticalCount: 0, exposureCount: 0, lastUpdated: Date())
        XCTAssertEqual(data3.threatPercentage, 0)
    }

    // MARK: - WidgetAlert

    func testWidgetAlertSeverityEnum() {
        let critical = WidgetAlert(id: "1", title: "Test", message: "Msg", severity: "critical", type: "breach", createdAt: nil)
        XCTAssertEqual(critical.severityEnum, .critical)

        let high = WidgetAlert(id: "2", title: "Test", message: "Msg", severity: "high", type: "exposure", createdAt: nil)
        XCTAssertEqual(high.severityEnum, .high)

        let medium = WidgetAlert(id: "3", title: "Test", message: "Msg", severity: "medium", type: "voiceMatch", createdAt: nil)
        XCTAssertEqual(medium.severityEnum, .medium)

        let low = WidgetAlert(id: "4", title: "Test", message: "Msg", severity: "low", type: "removal", createdAt: nil)
        XCTAssertEqual(low.severityEnum, .low)

        // Unknown severity defaults to low
        let unknown = WidgetAlert(id: "5", title: "Test", message: "Msg", severity: "unknown", type: "login", createdAt: nil)
        XCTAssertEqual(unknown.severityEnum, .low)
    }

    func testWidgetAlertTypeEnum() {
        let breach = WidgetAlert(id: "1", title: "Test", message: "Msg", severity: "low", type: "breach", createdAt: nil)
        XCTAssertEqual(breach.typeEnum, .breach)

        let exposure = WidgetAlert(id: "2", title: "Test", message: "Msg", severity: "low", type: "exposure", createdAt: nil)
        XCTAssertEqual(exposure.typeEnum, .exposure)
    }

    func testWidgetAlertDeepLink() {
        let alert = WidgetAlert(id: "abc-123", title: "Test", message: "Msg", severity: "high", type: "breach", createdAt: nil)
        let url = alert.deepLink
        XCTAssertEqual(url.absoluteString, "kordant://alerts/abc-123")
    }

    // MARK: - Placeholder & Unavailable

    func testPlaceholderData() {
        let placeholder = WidgetData.placeholder
        XCTAssertEqual(placeholder.threatScore, 0.25)
        XCTAssertEqual(placeholder.alertCount, 5)
        XCTAssertEqual(placeholder.recentAlerts.count, 3)
    }

    func testUnavailableData() {
        let unavailable = WidgetData.unavailable
        XCTAssertEqual(unavailable.threatScore, 0)
        XCTAssertEqual(unavailable.alertCount, 0)
        XCTAssertEqual(unavailable.recentAlerts.count, 0)
    }

    func testPlaceholderAlerts() {
        let alerts = WidgetAlert.placeholders
        XCTAssertEqual(alerts.count, 3)
        XCTAssertEqual(alerts[0].title, "Data Breach Detected")
        XCTAssertEqual(alerts[0].severity, "critical")
        XCTAssertEqual(alerts[1].severity, "high")
        XCTAssertEqual(alerts[2].severity, "medium")
    }

    // MARK: - Severity Filter

    func testSeverityFilterAll() {
        let filter = AlertSeverityFilter.all
        XCTAssertTrue(filter.matches(severity: "low"))
        XCTAssertTrue(filter.matches(severity: "medium"))
        XCTAssertTrue(filter.matches(severity: "high"))
        XCTAssertTrue(filter.matches(severity: "critical"))
    }

    func testSeverityFilterCritical() {
        let filter = AlertSeverityFilter.critical
        XCTAssertFalse(filter.matches(severity: "low"))
        XCTAssertFalse(filter.matches(severity: "medium"))
        XCTAssertFalse(filter.matches(severity: "high"))
        XCTAssertTrue(filter.matches(severity: "critical"))
    }

    func testSeverityFilterHigh() {
        let filter = AlertSeverityFilter.high
        XCTAssertFalse(filter.matches(severity: "low"))
        XCTAssertFalse(filter.matches(severity: "medium"))
        XCTAssertTrue(filter.matches(severity: "high"))
        XCTAssertTrue(filter.matches(severity: "critical"))
    }

    // MARK: - Data Manager (integration)

    func testWidgetDataManagerSaveAndLoad() {
        let manager = WidgetDataManager.shared
        let original = WidgetData.placeholder

        // Clear any existing data
        manager.clear()
        XCTAssertNil(manager.load())

        // Save and reload
        manager.save(original)
        let loaded = manager.load()
        XCTAssertNotNil(loaded)
        XCTAssertEqual(loaded, original)
        XCTAssertEqual(loaded?.threatScore, 0.25)

        // Clean up
        manager.clear()
        XCTAssertNil(manager.load())
    }
}