using System.ComponentModel.DataAnnotations;

namespace PLib.Application.Metadata;

/// <summary>Where PLib may go looking for information about a video it has on disk.</summary>
public sealed class MetadataOptions
{
    public const string SectionName = "Metadata";

    /// <summary>
    /// The configured sources, in the order they were added. Empty by default: talking to a
    /// remote service about the user's files is something they have to ask for.
    /// </summary>
    public IList<MetadataSourceOptions> Sources { get; init; } = [];

    /// <summary>
    /// How long to wait between requests during a library-wide run. A single lookup is one
    /// request and needs no pause; a run over a thousand videos is a thousand, and public
    /// instances answer that with a rate limit if it arrives all at once.
    /// </summary>
    [Range(0, 10_000)]
    public int RequestDelayMilliseconds { get; init; } = 250;
}

/// <summary>One GraphQL endpoint that can be asked about a video.</summary>
public sealed class MetadataSourceOptions
{
    /// <summary>What to call it in the interface; the endpoint is no use as a label.</summary>
    [Required]
    public string Name { get; init; } = string.Empty;

    /// <summary>Absolute URL of the GraphQL endpoint.</summary>
    [Required]
    public string Endpoint { get; init; } = string.Empty;

    /// <summary>
    /// Sent as the <c>ApiKey</c> header. Stored in the settings file in plain text — the same
    /// place and the same protection the rest of the settings get, which is the file system's.
    /// </summary>
    public string ApiKey { get; init; } = string.Empty;

    /// <summary>False for a source the user has switched off without deleting it.</summary>
    public bool IsEnabled { get; init; } = true;

    /// <summary>True when this entry has enough filled in to be worth calling.</summary>
    public bool IsUsable =>
        IsEnabled &&
        !string.IsNullOrWhiteSpace(Endpoint) &&
        Uri.TryCreate(Endpoint, UriKind.Absolute, out _);
}