using ShiroBot.SDK.Models;
using ShiroBot.SDK.Plugin;
using ShiroBot.Model.QQ;
using MyAgent;
using MyAgent.Core;
using MyAgent.Tools;
using Channel = ShiroBot.SDK.Models.Channel;

namespace Shirobot.Plugin.MyAgent;

internal sealed class ShirobotGroupPlatform(IBotContext context) : IGroupPlatform
{
    private static readonly HttpClient DownloadClient = new() { Timeout = TimeSpan.FromSeconds(20) };
    public async Task<MessageSendResult?> SendAsync(
        long groupId, string text, IReadOnlyList<ChatAttachment> attachments,
        string? replyToMessageId, CancellationToken cancellationToken = default)
    {
        cancellationToken.ThrowIfCancellationRequested();
        using var scope = context.UsePlatform("qq");
        var segments = new List<MessageSegment>();
        if (!string.IsNullOrWhiteSpace(replyToMessageId)) segments.Add(new QuoteSegment(replyToMessageId));
        if (!string.IsNullOrWhiteSpace(text)) segments.Add(new TextSegment(text));
        foreach (var attachment in attachments)
        {
            var uri = !string.IsNullOrWhiteSpace(attachment.LocalPath) && File.Exists(attachment.LocalPath)
                ? "base64://" + Convert.ToBase64String(await File.ReadAllBytesAsync(attachment.LocalPath, cancellationToken))
                : attachment.SourceUrl;
            if (!string.IsNullOrWhiteSpace(uri)) segments.Add(new ImageSegment(uri) { Summary = "[图片]" });
        }
        if (segments.Count == 0) return null;
        var sent = await context.Message.SendMessageAsync(Channel.Group(groupId.ToString()), segments);
        return new MessageSendResult { Ok = true, MessageId = sent.MessageId, Timestamp = sent.Timestamp };
    }

    public async Task<IReadOnlyList<GroupChatEvent>> GetHistoryAsync(long groupId, int limit, CancellationToken cancellationToken = default)
    {
        cancellationToken.ThrowIfCancellationRequested();
        using var scope = context.UsePlatform("qq");
        var messages = await context.Message.GetHistoryMessagesAsync(Channel.Group(groupId.ToString()), limit: Math.Clamp(limit, 1, 100));
        return messages.Where(message => message.Sender.Id != message.SelfId)
            .Select(message => GroupChatEvent.User(groupId, message.Sender.Id, message.Member?.Nick ?? message.Sender.Name ?? message.Sender.Id,
                message.GetPlainText(), message.Timestamp, ToAttachments(message.Segments), message.MessageId))
            .ToArray();
    }

    public async Task<GroupProfileResult> GetProfileAsync(long groupId, CancellationToken cancellationToken = default)
    {
        cancellationToken.ThrowIfCancellationRequested();
        using var scope = context.UsePlatform("qq");
        var channel = await context.Channel.GetChannelAsync(groupId.ToString());
        var members = await context.Channel.GetMembersAsync(groupId.ToString());
        return new GroupProfileResult
        {
            GroupId = groupId,
            GroupName = channel?.Name ?? groupId.ToString(),
            AvatarUrl = $"https://p.qlogo.cn/gh/{groupId}/{groupId}/100",
            MemberCount = members.Count,
            Members = members.Select(member => new GroupMemberInfo
            {
                UserId = long.TryParse(member.User.Id, out var id) ? id : 0,
                Name = member.Nick ?? member.User.Name ?? member.User.Id,
                Role = member.Role.ToString().ToLowerInvariant(),
                AvatarUrl = $"https://q1.qlogo.cn/g?b=qq&nk={member.User.Id}&s=100"
            }).ToList()
        };
    }

    internal static ChatAttachment[] ToAttachments(IReadOnlyList<MessageSegment> segments) => segments
        .OfType<ResourceSegment>()
        .Select(segment => new ChatAttachment
        {
            Type = segment switch { ImageSegment => "image", AudioSegment => "audio", VideoSegment => "video", FileSegment => "file", _ => "resource" },
            Url = segment.Uri,
            SourceUrl = segment.Uri,
            Title = segment.FileName ?? "",
            Size = segment is FileSegment file ? file.FileSize ?? 0 : 0
        }).ToArray();

    internal async Task<List<ChatAttachment>> ToAttachmentsAsync(
        IReadOnlyList<MessageSegment> segments, long groupId, DocumentTextExtractor documents,
        CancellationToken cancellationToken)
    {
        using var scope = context.UsePlatform("qq");
        var attachments = new List<ChatAttachment>();
        foreach (var segment in segments.OfType<ResourceSegment>())
        {
            cancellationToken.ThrowIfCancellationRequested();
            var url = segment.Uri;
            if (string.IsNullOrWhiteSpace(url) && !string.IsNullOrWhiteSpace(segment.ResourceId))
            {
                if (segment is FileSegment)
                    url = await (context.GetAdapterExtension<IQFileApi>()?.GetGroupFileDownloadUrlAsync(groupId, segment.ResourceId)
                        ?? Task.FromResult(""));
                else
                    url = await context.Message.GetResourceUrlAsync(segment.ResourceId);
            }
            var attachment = new ChatAttachment
            {
                Type = segment switch { ImageSegment => "image", AudioSegment => "audio", VideoSegment => "video", FileSegment => "file", _ => "resource" },
                Url = url,
                SourceUrl = url,
                Title = segment.FileName ?? "",
                Size = segment is FileSegment file ? file.FileSize ?? 0 : 0
            };
            if (segment is FileSegment && Uri.TryCreate(url, UriKind.Absolute, out var uri) && uri.Scheme is "http" or "https")
            {
                try
                {
                    var cache = Path.Combine(context.PluginDirectory, "data", "attachments");
                    Directory.CreateDirectory(cache);
                    var suffix = Path.GetExtension(attachment.Title);
                    var path = Path.Combine(cache, Guid.NewGuid().ToString("n") + suffix);
                    using var response = await DownloadClient.GetAsync(uri, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
                    response.EnsureSuccessStatusCode();
                    if (response.Content.Headers.ContentLength is > 15_000_000) throw new InvalidDataException("Attachment exceeds 15 MB");
                    await using (var input = await response.Content.ReadAsStreamAsync(cancellationToken))
                    await using (var output = File.Create(path))
                    {
                        var buffer = new byte[81920];
                        long total = 0;
                        int read;
                        while ((read = await input.ReadAsync(buffer, cancellationToken)) > 0)
                        {
                            total += read;
                            if (total > 15_000_000) throw new InvalidDataException("Attachment exceeds 15 MB");
                            await output.WriteAsync(buffer.AsMemory(0, read), cancellationToken);
                        }
                    }
                    attachment.LocalPath = path;
                    attachment.TextContent = await documents.TryExtractAsync(path, attachment.Title,
                        response.Content.Headers.ContentType?.MediaType ?? "", cancellationToken);
                }
                catch (Exception ex) when (ex is not OperationCanceledException)
                {
                    ShiroBot.SDK.Abstractions.BotLog.Warning($"Could not read group attachment: {ex.Message}");
                }
            }
            attachments.Add(attachment);
        }
        return attachments;
    }
}