using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Text.Json.Serialization;

using decePubClient.Models.Types;
using decePubClient.Resources;

namespace decePubClient.Models;

/// <summary>
/// A new post or reply. It goes through the Mastodon API (plain text, a content warning, a visibility and media) unless
/// it is located (text only, kept within RangeKm of where it was written, never federated) or meant for a group; those
/// go through /clientapi/post/insert.
/// </summary>
public class ComposeForm
{
	public const int MaxContentLength = 5_000;

	/// <summary>The status a reply answers.</summary>
	public string InReplyToId { get; set; }
	/// <summary>The community or circle the post is for.</summary>
	public string GroupId { get; set; }

	[Required(ErrorMessageResourceName = ValidationNames.Required, ErrorMessageResourceType = typeof(ErrorMessages))]
	public MessageType MessageType { get; set; } = MessageType.Public;
	public bool HasContentWarning { get; set; }
	// its media marked sensitive without a warning: the persona's default ("always mark media as sensitive"), or the post's own when edited
	public bool Sensitive { get; set; }
	[StringLength(500, ErrorMessageResourceName = ValidationNames.MaxLength, ErrorMessageResourceType = typeof(ErrorMessages))]
	public string SpoilerText { get; set; }
	[StringLength(MaxContentLength, ErrorMessageResourceName = ValidationNames.MaxLength, ErrorMessageResourceType = typeof(ErrorMessages))]
	public string Content { get; set; }
	public List<UploadMedia> Media { get; set; } = [];

	/// <summary>A located post: shown only to readers within RangeKm of Latitude/Longitude.</summary>
	public bool IsLocated { get; set; }
	[Range(1, 50)]
	public double RangeKm { get; set; } = 5;
	public double? Latitude { get; set; }
	public double? Longitude { get; set; }

	/// <summary>A poll instead of media: two to four choices, open ExpiresIn seconds, one choice or several.</summary>
	public bool HasPoll { get; set; }
	public List<string> PollOptions { get; set; } = ["", ""];
	public int PollExpiresIn { get; set; } = 86400;
	public bool PollMultiple { get; set; }

	/// <summary>The language the post is written in (ISO 639-1); null leaves it to PrivaPub.</summary>
	public string Language { get; set; }

	/// <summary>The post this one quotes.</summary>
	public string QuotedStatusId { get; set; }

	/// <summary>Whether the post waits for ScheduledAt (a datetime-local value, the reader's own time) instead of going now.</summary>
	public bool IsScheduled { get; set; }
	public string ScheduledAt { get; set; }

	/// <summary>When the post is to be published, in UTC, or null when it goes now or ScheduledAt is not a time.</summary>
	public DateTime? ScheduledAtUtc => IsScheduled && DateTime.TryParse(ScheduledAt, System.Globalization.CultureInfo.InvariantCulture,
		System.Globalization.DateTimeStyles.AssumeLocal, out var local) ? local.ToUniversalTime() : null;

	[JsonIgnore, Bindable(false)]
	public MediaType MediaType { get; set; } = MediaType.Images;
	[JsonIgnore, Bindable(false)]
	public bool IsScopeOptionsOpen { get; set; }

	/// <summary>The Mastodon visibility of MessageType.</summary>
	public string Visibility => MessageType switch
	{
		MessageType.Direct => "direct",
		MessageType.FollowersOnly => "private",
		MessageType.Unlisted => "unlisted",
		_ => "public"
	};
}