'use client';

import { useState, useRef } from 'react';
import { Upload, User, X, Loader2 } from 'lucide-react';

interface AgentAvatarUploadProps {
  agentId: string;
  currentAvatarUrl?: string | null;
  displayName?: string;
  canEdit?: boolean;
  onUpdated?: () => void;
}

export function AgentAvatarUpload({
  agentId,
  currentAvatarUrl,
  displayName = 'Agent',
  canEdit = false,
  onUpdated,
}: AgentAvatarUploadProps) {
  const [uploading, setUploading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [previewUrl, setPreviewUrl] = useState<string | null>(currentAvatarUrl || null);

  const inputRef = useRef<HTMLInputElement>(null);

  const handleUpload = async (file: File) => {
    setUploading(true);
    setError(null);

    try {
      // Upload file
      const formData = new FormData();
      formData.append('file', file);
      formData.append('type', 'agent_avatar');

      const uploadRes = await fetch('/api/assets/upload', {
        method: 'POST',
        body: formData,
      });

      if (!uploadRes.ok) {
        throw new Error('Failed to upload file');
      }

      const uploadData = await uploadRes.json();
      // Convert relative URL to use our API proxy
      let imageUrl = uploadData.processed_url || uploadData.original_url;
      if (imageUrl && imageUrl.startsWith('/static/')) {
        // Proxy through our API route
        imageUrl = `/api${imageUrl}`;
      }

      // Update agent DAIS
      const updateRes = await fetch(`/api/agents/${agentId}/dais`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          vis: { avatar_url: imageUrl },
        }),
      });

      if (!updateRes.ok) {
        throw new Error('Failed to update avatar');
      }

      setPreviewUrl(imageUrl);
      onUpdated?.();
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Upload failed');
    } finally {
      setUploading(false);
    }
  };

  const handleRemove = async () => {
    setUploading(true);
    setError(null);

    try {
      const updateRes = await fetch(`/api/agents/${agentId}/dais`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          vis: { avatar_url: null },
        }),
      });

      if (!updateRes.ok) {
        throw new Error('Failed to remove avatar');
      }

      setPreviewUrl(null);
      onUpdated?.();
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Remove failed');
    } finally {
      setUploading(false);
    }
  };

  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (file) {
      handleUpload(file);
    }
  };

  return (
    <div className="bg-white/5 backdrop-blur-md rounded-2xl border border-white/10 p-6">
      <h3 className="text-lg font-semibold text-white mb-4 flex items-center gap-2">
        <User className="w-5 h-5 text-violet-400" />
        Avatar
      </h3>

      {error && (
        <div className="mb-4 p-3 bg-red-500/10 border border-red-500/20 rounded-lg text-red-400 text-sm">
          {error}
        </div>
      )}

      <div className="flex items-start gap-4">
        {/* Avatar Preview */}
        <div className="relative">
          <div className="w-24 h-24 rounded-xl bg-gradient-to-br from-violet-500/30 to-purple-600/30 border border-white/10 overflow-hidden group">
            {previewUrl ? (
              <>
                {/* eslint-disable-next-line @next/next/no-img-element */}
                <img
                  src={previewUrl}
                  alt={displayName}
                  className="w-full h-full object-cover"
                />
                {canEdit && (
                  <button
                    onClick={handleRemove}
                    disabled={uploading}
                    className="absolute top-1 right-1 p-1 bg-red-500/80 rounded-full opacity-0 group-hover:opacity-100 transition-opacity"
                  >
                    <X className="w-3 h-3 text-white" />
                  </button>
                )}
              </>
            ) : (
              <div className="w-full h-full flex items-center justify-center">
                <User className="w-10 h-10 text-violet-400/50" />
              </div>
            )}
            {uploading && (
              <div className="absolute inset-0 bg-black/50 flex items-center justify-center">
                <Loader2 className="w-6 h-6 text-white animate-spin" />
              </div>
            )}
          </div>
        </div>

        {/* Upload Controls */}
        {canEdit && (
          <div className="flex-1">
            <p className="text-sm text-white/50 mb-3">
              Upload a custom avatar for this agent. Recommended size: 256x256px.
            </p>
            <input
              ref={inputRef}
              type="file"
              accept="image/*"
              onChange={handleFileChange}
              className="hidden"
            />
            <button
              onClick={() => inputRef.current?.click()}
              disabled={uploading}
              className="flex items-center gap-2 px-4 py-2 text-sm bg-violet-500/20 hover:bg-violet-500/30 border border-violet-500/30 rounded-lg text-violet-300 transition-colors disabled:opacity-50"
            >
              <Upload className="w-4 h-4" />
              {previewUrl ? 'Change Avatar' : 'Upload Avatar'}
            </button>
          </div>
        )}
      </div>
    </div>
  );
}