// routes/tenant/messages/[id]/index.tsx
import { define } from "../../../../utils.ts";
import { page } from "fresh";
import {
  getMessageThread,
  markThreadAsRead,
} from "../../../../services/messageService.ts";
import { Message } from "../../../../db/interfaces.ts";
import { AlertMessage } from "../../maintenance/new/components/AlertMessage.tsx";

interface MessageThreadPageData {
  thread: Message[];
  error?: string;
  currentUserId: string;
  rootMessageId: string;
}

export const handler = define.handlers({
  async GET(ctx) {
    const { user_id } = ctx.state.data;
    const messageId = ctx.params.id;

    try {
      const thread = await getMessageThread(messageId);

      if (!thread || thread.length === 0) {
        return page<MessageThreadPageData>({
          thread: [],
          error: "Message thread not found.",
          currentUserId: user_id,
          rootMessageId: messageId,
        });
      }

      const rootMessageId = thread[0].parent_message_id || thread[0].id;

      await markThreadAsRead(user_id, rootMessageId);

      return page<MessageThreadPageData>({
        thread,
        currentUserId: user_id,
        rootMessageId,
      });
    } catch (error) {
      console.error("Error loading message thread:", error);
      return page<MessageThreadPageData>({
        thread: [],
        error: "Failed to load message thread.",
        currentUserId: user_id,
        rootMessageId: messageId,
      });
    }
  },
});

// Helper component for rendering a single message
function MessageBubble(
  { message, isOutgoing }: { message: Message; isOutgoing: boolean },
) {
  const bubbleClass = isOutgoing
    ? "bg-blue-500 text-white self-end rounded-br-none"
    : "bg-gray-200 text-gray-800 self-start rounded-tl-none";
  const alignmentClass = isOutgoing ? "justify-end" : "justify-start";

  const date = message.created_on
    ? new Date(message.created_on).toLocaleString()
    : "Unknown Date";

  const attachments = Array.isArray(message.attachments_json)
    ? message.attachments_json
    : message.attachments_json
    ? JSON.parse(message.attachments_json as unknown as string)
    : [];
  const content = message.content_encrypted || message.content || "";

  return (
    <div class={`flex ${alignmentClass} mb-4`}>
      <div class={`max-w-3/4 p-4 rounded-lg shadow-md ${bubbleClass}`}>
        <p class="text-xs opacity-80 mb-1">
          {isOutgoing ? "You" : "Landlord"} - {date}
        </p>
        <p class="text-sm whitespace-pre-wrap">{content}</p>

        {attachments.length > 0 && (
          <div class="mt-3 pt-3 border-t border-opacity-30">
            <p class="text-xs font-semibold mb-1">Attachments:</p>
            <ul class="space-y-1">
              {attachments.map((att: { url: string; name: string }) => (
                <li key={att.url}>
                  <a
                    href={att.url}
                    target="_blank"
                    class="text-xs underline hover:text-opacity-80"
                  >
                    {att.name}
                  </a>
                </li>
              ))}
            </ul>
          </div>
        )}
      </div>
    </div>
  );
}

export default define.page(function MessageThreadPage({ data }) {
  const { thread, error, currentUserId, rootMessageId } =
    data as MessageThreadPageData;

  const rootMessage = thread[0];
  const subject = rootMessage?.subject || "Conversation";

  return (
    <div class="min-h-screen bg-gray-50 tenant-route">
      {/* Header */}
      <div class="bg-white shadow">
        <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
          <div class="py-6 flex justify-between items-center">
            <div>
              <h1 class="text-3xl font-bold text-gray-900">Message Thread</h1>
              <p class="mt-1 text-sm text-gray-500">Subject: {subject}</p>
            </div>
            <div class="flex space-x-3">
              <a
                href="/tenant/messages"
                class="inline-flex items-center px-4 py-2 border border-gray-300 text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50 shadow-sm"
              >
                All messages
              </a>
              <a
                href="/tenant/dashboard"
                class="inline-flex items-center px-4 py-2 border border-gray-300 text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50 shadow-sm"
              >
                Dashboard
              </a>
            </div>
          </div>
        </div>
      </div>

      {/* Main Content */}
      <div class="max-w-4xl mx-auto sm:px-6 lg:px-8 py-8">
        {error && <AlertMessage type="error">{error}</AlertMessage>}

        <div class="flex flex-col space-y-4 p-6 bg-white shadow overflow-hidden sm:rounded-lg">
          {thread.map((message) => (
            <MessageBubble
              key={message.id}
              message={message}
              isOutgoing={message.sender_id === currentUserId}
            />
          ))}
        </div>

        {/* Reply Button at the bottom for convenience */}
        <div class="mt-8 flex justify-end">
          <a
            href={`/tenant/messages/new?reply_to=${rootMessageId}`}
            class="inline-flex items-center px-6 py-3 border border-transparent text-base font-medium rounded-md shadow-sm text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
          >
            Reply to Thread
          </a>
        </div>
      </div>
    </div>
  );
});