import { error, fail, redirect } from '@sveltejs/kit';
import { createApiClient } from '$lib/api.server';
import { getErrorMessage } from '$lib/errors';

export async function load({ params, fetch }) {
    const { id } = params;
    const api = createApiClient(fetch);

    const [personResult, docsResult] = await Promise.all([
        api.GET('/api/persons/{id}', { params: { path: { id } } }),
        api.GET('/api/persons/{id}/documents', { params: { path: { id } } })
    ]);

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

    return {
        person: personResult.data!,
        documents: docsResult.data ?? []
    };
}

export const actions = {
    update: async ({ request, params, fetch }) => {
        const formData = await request.formData();
        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;

        if (!firstName || !lastName) {
            return fail(400, { updateError: 'Vor- und Nachname sind Pflichtfelder.' });
        }

        const api = createApiClient(fetch);
        const { error: apiError } = await api.PUT('/api/persons/{id}', {
            params: { path: { id: params.id } },
            body: { firstName, lastName, ...(alias ? { alias } : {}), ...(notes ? { notes } : {}) }
        });

        if (apiError) {
            return fail(400, { updateError: 'Speichern fehlgeschlagen.' });
        }

        return { updated: true };
    },

    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 { error: apiError } = await api.POST('/api/persons/{id}/merge', {
            params: { path: { id: params.id } },
            body: { targetPersonId }
        });

        if (apiError) {
            return fail(400, { mergeError: 'Zusammenführen fehlgeschlagen.' });
        }

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