using BotPages.Core.Abstractions;

namespace BotPages.Core.Messaging;

/// <summary>
/// Fluent‑билдер для отправки сообщений (текст, кнопки, файлы, альбомы, прогресс).
/// </summary>
public sealed class MessageBuilder
{
    private readonly PageContext _ctx;
    private string? _text = null;
    private MessageFormat _format = MessageFormat.Plain;
    private readonly List<List<InlineButton>> _inline = new();
    private readonly List<List<ReplyButton>> _reply = new();
    private readonly List<(FileDescriptor file, string? caption, MessageFormat? captionFormat)> _files = new();
    private readonly List<(FileDescriptor file, string? caption, MessageFormat? captionFormat)> _album = new();
    private string? _progressTitle = null;
    private int? _progressPercent = null;
    private string? _progressMessageId = null;
    private bool _disableReplyKeyboard;

    /// <summary>Создать билдер сообщений.</summary>
    public MessageBuilder(PageContext ctx) => _ctx = ctx;

    /// <summary>Текст сообщения.</summary>
    public MessageBuilder Text(string text, MessageFormat format = MessageFormat.Plain)
    {
        _text = text;
        _format = format;
        return this;
    }

    /// <summary>Добавить inline‑кнопку.</summary>
    public MessageBuilder Inline(string label, string value)
    {
        _inline.Add(new() { new(label, value) });
        return this;
    }

    /// <summary>Добавить inline‑кнопку.</summary>
    public MessageBuilder Inline(InlineButton button)
    {
        _inline.Add(new() { button });
        return this;
    }

    /// <summary>Добавить inline‑кнопку.</summary>
    public MessageBuilder Inline(params InlineButton[] buttons)
    {
        _inline.Add(buttons.ToList());
        return this;
    }

    /// <summary>Добавить строку inline‑кнопок.</summary>
    public MessageBuilder Inline(IEnumerable<InlineButton> row)
    {
        _inline.Add(row.ToList());
        return this;
    }

    /// <summary>Добавить строку inline‑кнопок.</summary>
    public MessageBuilder Inline(IEnumerable<IEnumerable<InlineButton>> row)
    {
        _inline.AddRange(row.Select(t => t.ToList()).ToList());
        return this;
    }

    /// <summary>
    /// Отключение Reply клавиатуры.
    /// </summary>
    /// <returns></returns>
    public MessageBuilder DisableReply()
    {
        _disableReplyKeyboard = true;
        return this;
    }

    /// <summary>Добавить reply‑кнопку.</summary>
    public MessageBuilder Reply(params ReplyButton[] label)
    {
        _disableReplyKeyboard = false;
        _reply.Add(label.ToList());
        return this;
    }

    /// <summary>Добавить строку reply‑кнопок.</summary>
    public MessageBuilder Reply(IEnumerable<ReplyButton> row)
    {
        _disableReplyKeyboard = false;
        _reply.Add(row.ToList());
        return this;
    }

    /// <summary>Добавить строку reply‑кнопок.</summary>
    public MessageBuilder Reply(IEnumerable<IEnumerable<ReplyButton>> row)
    {
        _disableReplyKeyboard = false;
        _reply.AddRange(row.Select(t => t.ToList()).ToList());
        return this;
    }

    /// <summary>Добавить файл для отправки.</summary>
    public MessageBuilder File(FileDescriptor file, string? caption = null, MessageFormat? captionFormat = null)
    {
        _files.Add((file, caption, captionFormat));
        return this;
    }

    /// <summary>Добавить файл в альбом.</summary>
    public MessageBuilder Album(FileDescriptor file, string? caption = null, MessageFormat? captionFormat = null)
    {
        _album.Add((file, caption, captionFormat));
        return this;
    }

    /// <summary>Установить прогресс операции.</summary>
    public MessageBuilder Progress(string title, int percent = 0)
    {
        _progressTitle = title;
        _progressPercent = percent;
        return this;
    }

    /// <summary>Отправить собранное сообщение.</summary>
    public async Task SendAsync(CancellationToken ct = default)
    {
        // Текст
        if (!string.IsNullOrWhiteSpace(_text))
        {
            List<List<ReplyButton>>? reply = null;
            if (_disableReplyKeyboard) reply = new();
            else if (_reply.Any()) reply = _reply;

            await _ctx.SendTextAsync(_text, _format, _inline, reply, ct);
        }

        // Файлы
        foreach (var (file, caption, captionFormat) in _files)
            await _ctx.SendFileAsync(file, caption, captionFormat, ct);

        // Альбом
        if (_album.Count > 0)
        {
            var builder = _ctx.Albums;
            foreach (var (file, caption, captionFormat) in _album)
                builder.Add(file, caption, captionFormat);
            await builder.SendAsync(ct);
        }

        // Прогресс
        if (_progressTitle is not null)
        {
            if (_progressMessageId is null)
                _progressMessageId = await _ctx.StartProgressAsync(_progressTitle, ct);

            if (_progressPercent > 0 && !string.IsNullOrEmpty(_progressMessageId))
                await _ctx.UpdateProgressAsync(_progressMessageId, _progressPercent.Value, ct);
        }

        _text = null;
        _files.Clear();
        _album.Clear();

        if (_progressPercent >= 100)
        {
            _progressTitle = null;
            _progressMessageId = null;
            _progressPercent = null;
        }
    }
}