import { json } from '@sveltejs/kit';
import type { RequestHandler } from './$types';

/**
 * GET: Retrieve the Matrix Space ID for an org
 */
export const GET: RequestHandler = async ({ url, locals }) => {
	const session = await locals.safeGetSession();
	if (!session.user) {
		return json({ error: 'Unauthorized' }, { status: 401 });
	}

	const orgId = url.searchParams.get('org_id');
	if (!orgId) {
		return json({ error: 'org_id is required' }, { status: 400 });
	}

	const { data, error } = await locals.supabase
		.from('organizations')
		.select('matrix_space_id')
		.eq('id', orgId)
		.single();

	if (error) {
		return json({ error: error.message }, { status: 500 });
	}

	return json({ spaceId: data?.matrix_space_id ?? null });
};

/**
 * POST: Create a Matrix Space for an org, or link an existing one.
 * 
 * Body options:
 * - { org_id, action: "create", homeserver_url, access_token, org_name }
 *   Creates a new Space on the homeserver and stores the ID.
 * - { org_id, action: "link", space_id }
 *   Links an existing Matrix Space ID to the org.
 */
export const POST: RequestHandler = async ({ request, locals }) => {
	const session = await locals.safeGetSession();
	if (!session.user) {
		return json({ error: 'Unauthorized' }, { status: 401 });
	}

	const body = await request.json();
	const { org_id, action } = body;

	if (!org_id || !action) {
		return json({ error: 'org_id and action are required' }, { status: 400 });
	}

	if (action === 'create') {
		const { homeserver_url, access_token, org_name } = body;
		if (!homeserver_url || !access_token || !org_name) {
			return json({ error: 'homeserver_url, access_token, and org_name are required for create' }, { status: 400 });
		}

		try {
			// Create a Matrix Space via the Client-Server API
			const createRes = await fetch(`${homeserver_url}/_matrix/client/v3/createRoom`, {
				method: 'POST',
				headers: {
					'Authorization': `Bearer ${access_token}`,
					'Content-Type': 'application/json',
				},
				body: JSON.stringify({
					name: org_name,
					topic: `Organization space for ${org_name}`,
					visibility: 'private',
					creation_content: {
						type: 'm.space',
					},
					initial_state: [
						{
							type: 'm.room.guest_access',
							state_key: '',
							content: { guest_access: 'can_join' },
						},
					],
					power_level_content_override: {
						invite: 50,
						kick: 50,
						ban: 50,
						events_default: 0,
						state_default: 50,
					},
				}),
			});

			if (!createRes.ok) {
				const err = await createRes.json().catch(() => ({}));
				return json({ error: err.error || 'Failed to create Matrix Space' }, { status: 500 });
			}

			const { room_id: spaceId } = await createRes.json();

			// Also create default #general room inside the space
			const generalRes = await fetch(`${homeserver_url}/_matrix/client/v3/createRoom`, {
				method: 'POST',
				headers: {
					'Authorization': `Bearer ${access_token}`,
					'Content-Type': 'application/json',
				},
				body: JSON.stringify({
					name: 'General',
					topic: 'General discussion',
					visibility: 'private',
					preset: 'private_chat',
				}),
			});

			if (generalRes.ok) {
				const { room_id: generalRoomId } = await generalRes.json();

				// Add #general as a child of the space
				await fetch(
					`${homeserver_url}/_matrix/client/v3/rooms/${encodeURIComponent(spaceId)}/state/m.space.child/${encodeURIComponent(generalRoomId)}`,
					{
						method: 'PUT',
						headers: {
							'Authorization': `Bearer ${access_token}`,
							'Content-Type': 'application/json',
						},
						body: JSON.stringify({
							via: [new URL(homeserver_url).hostname],
						}),
					}
				);
			}

			// Store space ID in org record
			const { error: updateError } = await locals.supabase
				.from('organizations')
				.update({ matrix_space_id: spaceId })
				.eq('id', org_id);

			if (updateError) {
				return json({ error: updateError.message }, { status: 500 });
			}

			return json({ spaceId, created: true });
		} catch (e: any) {
			console.error('Failed to create Matrix Space:', e);
			return json({ error: e.message || 'Failed to create Matrix Space' }, { status: 500 });
		}
	}

	if (action === 'link') {
		const { space_id } = body;
		if (!space_id) {
			return json({ error: 'space_id is required for link action' }, { status: 400 });
		}

		const { error: updateError } = await locals.supabase
			.from('organizations')
			.update({ matrix_space_id: space_id })
			.eq('id', org_id);

		if (updateError) {
			return json({ error: updateError.message }, { status: 500 });
		}

		return json({ spaceId: space_id, linked: true });
	}

	return json({ error: 'Invalid action. Use "create" or "link".' }, { status: 400 });
};