using System;
using System.Linq;
using Discord;
using NadekoBot.Extensions;
using NadekoBot.Services;

namespace NadekoBot
{
    public sealed record SmartEmbedText : SmartText
    {
        public string PlainText { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public string Url { get; set; }
        public string Thumbnail { get; set; }
        public string Image { get; set; }

        public SmartTextEmbedAuthor Author { get; set; }
        public SmartTextEmbedFooter Footer { get; set; }
        public SmartTextEmbedField[] Fields { get; set; }

        public uint Color { get; set; } = 7458112;

        public bool IsValid =>
            !string.IsNullOrWhiteSpace(Title) ||
            !string.IsNullOrWhiteSpace(Description) ||
            !string.IsNullOrWhiteSpace(Url) ||
            !string.IsNullOrWhiteSpace(Thumbnail) ||
            !string.IsNullOrWhiteSpace(Image) ||
            (Footer != null && (!string.IsNullOrWhiteSpace(Footer.Text) || !string.IsNullOrWhiteSpace(Footer.IconUrl))) ||
            (Fields != null && Fields.Length > 0);

        public static SmartEmbedText FromEmbed(IEmbed eb, string plainText = null)
        {
            var set = new SmartEmbedText();
            
            set.PlainText = plainText;
            set.Title = eb.Title;
            set.Description = eb.Description;
            set.Url = eb.Url;
            set.Thumbnail = eb.Thumbnail?.Url;
            set.Image = eb.Image?.Url;
            set.Author = eb.Author is EmbedAuthor ea
                ? new()
                {
                    Name = ea.Name,
                    Url = ea.Url,
                    IconUrl = ea.IconUrl
                }
                : null;
            set.Footer = eb.Footer is EmbedFooter ef
                ? new()
                {
                    Text = ef.Text,
                    IconUrl = ef.IconUrl
                }
                : null;

            if (eb.Fields.Length > 0)
                set.Fields = eb
                    .Fields
                    .Select(field => new SmartTextEmbedField()
                    {
                        Inline = field.Inline,
                        Name = field.Name,
                        Value = field.Value,
                    })
                    .ToArray();

            set.Color = eb.Color?.RawValue ?? 0;
            return set;
        }
        
        public EmbedBuilder GetEmbed()
        {
            var embed = new EmbedBuilder()
                .WithColor(Color);

            if (!string.IsNullOrWhiteSpace(Title))
                embed.WithTitle(Title);

            if (!string.IsNullOrWhiteSpace(Description))
                embed.WithDescription(Description);

            if (Url != null && Uri.IsWellFormedUriString(Url, UriKind.Absolute))
                embed.WithUrl(Url);

            if (Footer != null)
            {
                embed.WithFooter(efb =>
                {
                    efb.WithText(Footer.Text);
                    if (Uri.IsWellFormedUriString(Footer.IconUrl, UriKind.Absolute))
                        efb.WithIconUrl(Footer.IconUrl);
                });
            }

            if (Thumbnail != null && Uri.IsWellFormedUriString(Thumbnail, UriKind.Absolute))
                embed.WithThumbnailUrl(Thumbnail);

            if (Image != null && Uri.IsWellFormedUriString(Image, UriKind.Absolute))
                embed.WithImageUrl(Image);

            if (Author != null && !string.IsNullOrWhiteSpace(Author.Name))
            {
                if (!Uri.IsWellFormedUriString(Author.IconUrl, UriKind.Absolute))
                    Author.IconUrl = null;
                if (!Uri.IsWellFormedUriString(Author.Url, UriKind.Absolute))
                    Author.Url = null;

                embed.WithAuthor(Author.Name, Author.IconUrl, Author.Url);
            }

            if (Fields != null)
            {
                foreach (var f in Fields)
                {
                    if (!string.IsNullOrWhiteSpace(f.Name) && !string.IsNullOrWhiteSpace(f.Value))
                        embed.AddField(f.Name, f.Value, f.Inline);
                }
            }

            return embed;
        }

        public void NormalizeFields()
        {
            if (Fields != null && Fields.Length > 0)
            {
                foreach (var f in Fields)
                {
                    f.Name = f.Name.TrimTo(256);
                    f.Value = f.Value.TrimTo(1024);
                }
            }
        }
    }
}