"use client";

import { useState } from "react";
import { CanvasCollaborator, addCanvasCollaborator } from "@/lib/api";
import { UserPlus, X, User } from "lucide-react";

interface CanvasCollaboratorsProps {
  canvasId: string;
  collaborators: CanvasCollaborator[];
  onUpdated?: () => void;
}

export function CanvasCollaborators({ canvasId, collaborators, onUpdated }: CanvasCollaboratorsProps) {
  const [showAdd, setShowAdd] = useState(false);
  const [userId, setUserId] = useState("");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState("");

  const handleAdd = async () => {
    if (!userId.trim()) return;
    setLoading(true);
    setError("");
    try {
      await addCanvasCollaborator(canvasId, { user_id: userId.trim() });
      setUserId("");
      setShowAdd(false);
      onUpdated?.();
    } catch (err: any) {
      const msg = err.response?.data?.error || err.response?.data?.message || err.message || "Failed to add collaborator";
      setError(typeof msg === "string" ? msg : JSON.stringify(msg));
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="border-t border-gray-200 px-4 py-3">
      <div className="flex items-center justify-between mb-2">
        <h3 className="text-xs font-semibold text-gray-500 uppercase">Collaborators</h3>
        <button
          onClick={() => setShowAdd(!showAdd)}
          className="p-1 rounded text-gray-400 hover:text-gray-600 hover:bg-gray-100 transition-colors"
          title="Add collaborator"
        >
          <UserPlus size={16} />
        </button>
      </div>

      {showAdd && (
        <div className="mb-3 flex gap-2">
          <input
            type="text"
            value={userId}
            onChange={(e) => setUserId(e.target.value)}
            placeholder="User ID"
            className="flex-1 px-2 py-1.5 rounded-md border border-gray-300 focus:outline-none focus:ring-2 focus:ring-slack-purple focus:border-transparent text-xs"
          />
          <button
            onClick={handleAdd}
            disabled={loading || !userId.trim()}
            className="px-3 py-1.5 rounded-md bg-slack-purple text-white text-xs font-medium hover:bg-slack-darkpurple disabled:opacity-40 transition-colors"
          >
            Add
          </button>
          <button
            onClick={() => {
              setShowAdd(false);
              setUserId("");
              setError("");
            }}
            className="p-1.5 rounded-md text-gray-400 hover:bg-gray-100 transition-colors"
          >
            <X size={16} />
          </button>
        </div>
      )}

      {error && (
        <p className="text-xs text-slack-red mb-2">{error}</p>
      )}

      <div className="space-y-2">
        {collaborators.map((c) => {
          const name = c.user?.name || c.user?.display_name || c.user?.email || c.user_id;
          return (
            <div key={c.user_id} className="flex items-center gap-2 text-sm text-gray-700">
              <div className="w-6 h-6 rounded-full bg-slack-purple text-white flex items-center justify-center text-xs font-bold">
                {typeof name === "string" && name[0] ? name[0].toUpperCase() : "U"}
              </div>
              <span className="truncate flex-1">{name}</span>
              {c.role && <span className="text-xs text-gray-400">{c.role}</span>}
            </div>
          );
        })}
        {collaborators.length === 0 && !showAdd && (
          <p className="text-xs text-gray-400">No collaborators yet.</p>
        )}
      </div>
    </div>
  );
}