import { error, fail, redirect } from '@sveltejs/kit';
import { createApiClient } from '$lib/api.server';
import { getErrorMessage } from '$lib/errors';
import {
	normalizePersonType,
	validatePersonFields,
	resolveValidationMessage
} from '$lib/person-validation';

export async function load({ params, fetch, locals }) {
	const canWrite =
		(locals.user as { groups?: { permissions: string[] }[] } | undefined)?.groups?.some((g) =>
			g.permissions.includes('WRITE_ALL')
		) ?? false;

	if (!canWrite) throw error(403, 'Forbidden');

	const { id } = params;
	const api = createApiClient(fetch);
	const [result, aliasesResult] = await Promise.all([
		api.GET('/api/persons/{id}', { params: { path: { id } } }),
		api.GET('/api/persons/{id}/aliases', { params: { path: { id } } })
	]);

	if (!result.response.ok) {
		const code = (result.error as unknown as { code?: string })?.code;
		throw error(result.response.status, getErrorMessage(code));
	}

	const person = result.data!;
	const personType = normalizePersonType(person.personType);
	return { person: { ...person, personType }, aliases: aliasesResult.data ?? [] };
}

export const actions = {
	update: async ({ request, params, fetch }) => {
		const formData = await request.formData();
		const personType = normalizePersonType(formData.get('personType')?.toString());
		const title = formData.get('title')?.toString().trim() || undefined;
		const firstName = formData.get('firstName')?.toString().trim();
		const lastName = formData.get('lastName')?.toString().trim();
		const alias = formData.get('alias')?.toString().trim() || undefined;
		const notes = formData.get('notes')?.toString().trim() || undefined;
		const birthYearStr = formData.get('birthYear')?.toString().trim();
		const deathYearStr = formData.get('deathYear')?.toString().trim();
		const birthYear = birthYearStr ? parseInt(birthYearStr, 10) : undefined;
		const deathYear = deathYearStr ? parseInt(deathYearStr, 10) : undefined;

		const validationKey = validatePersonFields(personType, firstName, lastName);
		if (validationKey) {
			return fail(400, { updateError: resolveValidationMessage(validationKey) });
		}

		const api = createApiClient(fetch);
		const result = await api.PUT('/api/persons/{id}', {
			params: { path: { id: params.id } },
			body: {
				personType,
				...(title ? { title } : {}),
				...(firstName ? { firstName } : {}),
				lastName,
				...(alias ? { alias } : {}),
				...(notes ? { notes } : {}),
				...(birthYear ? { birthYear } : {}),
				...(deathYear ? { deathYear } : {})
			}
		});

		if (!result.response.ok) {
			const code = (result.error as unknown as { code?: string })?.code;
			return fail(result.response.status, { updateError: getErrorMessage(code) });
		}

		throw redirect(303, `/persons/${params.id}`);
	},

	discard: async ({ params }) => {
		throw redirect(303, `/persons/${params.id}`);
	},

	merge: async ({ request, params, fetch }) => {
		const formData = await request.formData();
		const targetPersonId = formData.get('targetPersonId')?.toString();

		if (!targetPersonId) {
			return fail(400, { mergeError: 'Bitte eine Zielperson auswählen.' });
		}

		const api = createApiClient(fetch);
		const result = await api.POST('/api/persons/{id}/merge', {
			params: { path: { id: params.id } },
			body: { targetPersonId }
		});

		if (!result.response.ok) {
			const code = (result.error as unknown as { code?: string })?.code;
			return fail(result.response.status, { mergeError: getErrorMessage(code) });
		}

		throw redirect(303, `/persons/${targetPersonId}`);
	},

	addAlias: async ({ request, params, fetch }) => {
		const formData = await request.formData();
		const lastName = formData.get('lastName')?.toString().trim();
		const firstName = formData.get('firstName')?.toString().trim() || undefined;
		const type = formData.get('type')?.toString();

		if (!lastName) {
			return fail(400, { aliasError: 'Nachname ist ein Pflichtfeld.' });
		}
		if (!type) {
			return fail(400, { aliasError: 'Art ist ein Pflichtfeld.' });
		}

		const api = createApiClient(fetch);
		const result = await api.POST('/api/persons/{id}/aliases', {
			params: { path: { id: params.id } },
			body: { lastName, firstName, type: type as 'BIRTH' | 'WIDOWED' | 'DIVORCED' | 'OTHER' }
		});

		if (!result.response.ok) {
			const code = (result.error as unknown as { code?: string })?.code;
			return fail(result.response.status, { aliasError: getErrorMessage(code) });
		}

		return { aliasSuccess: true };
	},

	removeAlias: async ({ request, params, fetch }) => {
		const formData = await request.formData();
		const aliasId = formData.get('aliasId')?.toString();

		if (!aliasId) {
			return fail(400, { aliasError: 'Alias ID fehlt.' });
		}

		const api = createApiClient(fetch);
		const result = await api.DELETE('/api/persons/{id}/aliases/{aliasId}', {
			params: { path: { id: params.id, aliasId } }
		});

		if (!result.response.ok) {
			const code = (result.error as unknown as { code?: string })?.code;
			return fail(result.response.status, { aliasError: getErrorMessage(code) });
		}

		return { aliasSuccess: true };
	}
};