using ytLive.Models;

namespace ytLive.Services;

/// <summary>Report-by-exception (TASK 5 item 3): turns liveStreams
/// configuration issues into a banner. good/ok/noData and info-only issues
/// produce no banner; the first warning/error issue produces its text, colored
/// by the worst severity (error beats warning). Pure — fully testable.</summary>
public static class StreamHealthReporter
{
    public static HealthIssueReport BannerFor(IEnumerable<StreamConfigurationIssue> issues)
    {
        var reportable = issues
            .Where(i => i.Severity is StreamIssueSeverity.Warning or StreamIssueSeverity.Error)
            .ToList();
        if (reportable.Count == 0) return new HealthIssueReport(null, false);

        var isError = reportable.Any(i => i.Severity == StreamIssueSeverity.Error);
        return new HealthIssueReport(
            string.Join(", ", reportable.Select(i => i.Type).Where(t => !string.IsNullOrWhiteSpace(t))),
            isError);
    }
}

/// <summary>null Text = no banner. IsError colors it: error → app red, else amber.</summary>
public record HealthIssueReport(string? Text, bool IsError);