using System;
using Paca.Mobile.Core;
using Xunit;

namespace Paca.Tests.Core;

public class DataUsageQuotaTrackerGateTests
{
    [Fact]
    public void Gate333_DataUsageQuotaTracker_AccumulatesWifiAndCellularSeparately()
    {
        var tracker = new DataUsageQuotaTracker();

        tracker.RecordUsage(bytes: 500 * 1024 * 1024, isCellular: false); // 500 MB Wifi
        tracker.RecordUsage(bytes: 300 * 1024 * 1024, isCellular: false); // 300 MB Wifi
        tracker.RecordUsage(bytes: 200 * 1024 * 1024, isCellular: true);  // 200 MB Cellular

        Assert.Equal(800 * 1024 * 1024L, tracker.TotalWifiBytes);
        Assert.Equal(200 * 1024 * 1024L, tracker.TotalCellularBytes);
        Assert.Equal(1000 * 1024 * 1024L, tracker.TotalBytes);
    }

    [Fact]
    public void Gate334_DataUsageQuotaTracker_TriggersWarningAt80Percent()
    {
        var settings = new QuotaSettings(
            MonthlyCellularQuotaBytes: 10L * 1024 * 1024 * 1024, // 10 GB
            WarningThresholdPercent: 80.0,
            AutoPauseOnQuotaExceeded: true
        );

        // 8.2 GB consumed (82%)
        var currentBytes = (long)(8.2 * 1024 * 1024 * 1024);
        var status = DataUsageQuotaTracker.EvaluateQuota(currentBytes, settings);

        Assert.True(status.IsWarning);
        Assert.False(status.IsExceeded);
        Assert.False(status.ShouldPauseDownload);
        Assert.True(status.UsagePercent >= 80.0 && status.UsagePercent < 100.0);
    }

    [Fact]
    public void Gate335_DataUsageQuotaTracker_AutoPausesWhen100PercentExceeded()
    {
        var settings = new QuotaSettings(
            MonthlyCellularQuotaBytes: 5L * 1024 * 1024 * 1024, // 5 GB
            WarningThresholdPercent: 80.0,
            AutoPauseOnQuotaExceeded: true
        );

        // 5.1 GB consumed (102%)
        var currentBytes = (long)(5.1 * 1024 * 1024 * 1024);
        var status = DataUsageQuotaTracker.EvaluateQuota(currentBytes, settings);

        Assert.True(status.IsWarning);
        Assert.True(status.IsExceeded);
        Assert.True(status.ShouldPauseDownload);
    }

    [Fact]
    public void Gate336_DataUsageQuotaTracker_PassesGracefully_WhenUnlimitedOrAutoPauseDisabled()
    {
        var unlimitedSettings = new QuotaSettings(
            MonthlyCellularQuotaBytes: 0, // 0 = Unlimited
            WarningThresholdPercent: 80.0,
            AutoPauseOnQuotaExceeded: true
        );

        var statusUnlimited = DataUsageQuotaTracker.EvaluateQuota(100L * 1024 * 1024 * 1024, unlimitedSettings);
        Assert.False(statusUnlimited.IsWarning);
        Assert.False(statusUnlimited.IsExceeded);
        Assert.False(statusUnlimited.ShouldPauseDownload);

        var noAutoPause = new QuotaSettings(
            MonthlyCellularQuotaBytes: 1L * 1024 * 1024 * 1024,
            WarningThresholdPercent: 80.0,
            AutoPauseOnQuotaExceeded: false // Auto pause disabled
        );

        var statusNoPause = DataUsageQuotaTracker.EvaluateQuota(2L * 1024 * 1024 * 1024, noAutoPause);
        Assert.True(statusNoPause.IsExceeded);
        Assert.False(statusNoPause.ShouldPauseDownload); // Allowed because auto pause is disabled
    }
}