import { fail, redirect } from '@sveltejs/kit';
import type { Actions, PageServerLoad } from './$types';
import { requireUser } from '#lib/server/auth.js';
import {
	createPiece,
	deletePieceTemplate,
	duplicatePiece,
	getPiece,
	listPieceTemplates,
	savePiece,
	setPieceArchived,
	setPieceDeleted,
	setPieceFavorite,
	uploadPieceImage,
	type EditablePieceStatus,
	type PieceEditor
} from '#lib/server/content.js';
import { fundusSearch, loadFundusWorkspace } from '#lib/server/fundus-workspace.js';

export const load: PageServerLoad = ({ locals, url }) => {
	requireUser(locals.user);
	const workspace = loadFundusWorkspace(url);
	const selectedId = url.searchParams.get('selected') ?? workspace.pieces[0]?.id ?? '';
	return {
		...workspace,
		selectedPiece: workspace.pieces.some((piece) => piece.id === selectedId)
			? getPiece(selectedId)
			: null,
		templates: listPieceTemplates()
	};
};

function preservedInput(piece: PieceEditor, data: FormData) {
	return {
		...piece,
		title: String(data.get('title') || ''),
		summary: String(data.get('summary') || ''),
		status: String(data.get('status') || piece.status) as EditablePieceStatus,
		formatId: String(data.get('formatId') || '') || null,
		durationSeconds: Math.round(Number(data.get('durationMinutes')) * 60),
		intro: String(data.get('intro') || ''),
		moderationNotes: String(data.get('moderationNotes') || ''),
		topicIds: piece.topicIds,
		categoryIds: piece.categoryIds,
		sources: piece.sources,
		tools: piece.tools.map((tool) => ({
			toolId: tool.toolId,
			workUrl: tool.workUrl,
			note: tool.note
		}))
	};
}

function actionError(cause: unknown) {
	const code = cause instanceof Error ? cause.message : '';
	if (code === 'CONFLICT') return 'Das Piece wurde inzwischen geändert. Bitte Seite neu laden.';
	if (code === 'NOT_FOUND') return 'Das Piece wurde nicht gefunden.';
	return 'Die Aktion konnte nicht ausgeführt werden.';
}

export const actions = {
	create: async ({ locals, request, url }) => {
		requireUser(locals.user);
		const data = await request.formData();
		let id: string;
		try {
			id = createPiece(String(data.get('template') || 'blank'));
		} catch (cause) {
			return fail(400, { intent: 'create', error: actionError(cause) });
		}
		redirect(303, `/fundus/${id}${fundusSearch(url)}`);
	},
	deleteTemplate: async ({ locals, request }) => {
		requireUser(locals.user);
		const data = await request.formData();
		try {
			deletePieceTemplate(String(data.get('templateId') || ''), Number(data.get('revision')));
			return { intent: 'deleteTemplate', success: 'Vorlage gelöscht.' };
		} catch (cause) {
			return fail(409, { intent: 'deleteTemplate', error: actionError(cause) });
		}
	},
	duplicate: async ({ locals, request, url }) => {
		requireUser(locals.user);
		const data = await request.formData();
		let id: string;
		try {
			id = await duplicatePiece(String(data.get('pieceId') || ''));
		} catch (cause) {
			return fail(400, { intent: 'duplicate', error: actionError(cause) });
		}
		redirect(303, `/fundus/${id}${fundusSearch(url)}`);
	},
	archive: async ({ locals, request }) => {
		requireUser(locals.user);
		const data = await request.formData();
		try {
			setPieceArchived(String(data.get('pieceId') || ''), Number(data.get('revision')), true);
			return { intent: 'archive', success: 'Piece archiviert.' };
		} catch (cause) {
			return fail(409, { intent: 'archive', error: actionError(cause) });
		}
	},
	favorite: async ({ locals, request }) => {
		requireUser(locals.user);
		const data = await request.formData();
		try {
			setPieceFavorite(String(data.get('pieceId') || ''), data.get('favorite') === '1');
			return { intent: 'favorite', success: 'Favorit aktualisiert.' };
		} catch (cause) {
			return fail(404, { intent: 'favorite', error: actionError(cause) });
		}
	},
	delete: async ({ locals, request }) => {
		requireUser(locals.user);
		const data = await request.formData();
		try {
			setPieceDeleted(String(data.get('pieceId') || ''), Number(data.get('revision')), true);
			return {
				intent: 'delete',
				success: 'Piece gelöscht. Bestehende Streamfassungen bleiben erhalten.'
			};
		} catch (cause) {
			return fail(409, { intent: 'delete', error: actionError(cause) });
		}
	},
	quickSave: async ({ locals, request }) => {
		requireUser(locals.user);
		const data = await request.formData();
		const id = String(data.get('pieceId') || '');
		const piece = getPiece(id);
		if (!piece || piece.status === 'archived')
			return fail(404, { intent: 'quickSave', error: 'Das Piece wurde nicht gefunden.' });
		try {
			const saved = savePiece(id, Number(data.get('revision')), preservedInput(piece, data));
			return { intent: 'quickSave', success: 'Schnelländerungen gespeichert.', ...saved };
		} catch (cause) {
			return fail(409, { intent: 'quickSave', error: actionError(cause) });
		}
	},
	quickUpload: async ({ locals, request }) => {
		requireUser(locals.user);
		const data = await request.formData();
		const image = data.get('image');
		if (!(image instanceof File))
			return fail(400, { intent: 'quickUpload', error: 'Bitte ein Bild auswählen.' });
		try {
			await uploadPieceImage(
				String(data.get('pieceId') || ''),
				Number(data.get('revision')),
				image,
				String(data.get('altText') || ''),
				false
			);
			return { intent: 'quickUpload', success: 'Bild hochgeladen.' };
		} catch (cause) {
			return fail(400, { intent: 'quickUpload', error: actionError(cause) });
		}
	}
} satisfies Actions;