import { OwlClient, ApiError, ValidationError } from '$lib/owlClient';
import type { ApiTrainsTrainByHeadcode } from '@owlboard/owlboard-ts';
import type { PageLoad } from './$types';
import { error } from '@sveltejs/kit';

export const load: PageLoad = async ({ url }) => {
    const headcode = url.searchParams.get('h');
    let dateParam = url.searchParams.get('d');
    const toc = url.searchParams.get('t') || "";

    const date: string | Date = (dateParam === "" || dateParam === null)
        ? new Date()
        : dateParam;

    if (!headcode) {
        throw error(400, {
            message: 'Headcode not provided',
            owlCode: 'INVALID_DATA'
        });
    }

    try {
        const response = await OwlClient.trains.getByHeadcode(headcode, date, toc);

        // Shouldn't be needed to cast the type...
        const results = (response.data || []);
        return {
            title: headcode.toUpperCase(),
            results: results,
        }
    } catch (e: unknown) {
        if (e instanceof ValidationError) {
            throw error(400, {
                message: e.message,
                owlCode: 'VALIDATION_ERROR',
            });
        } else if (e instanceof ApiError) {
            console.log(e);
            throw error(20, {
                message: e.message,
                owlCode: 'API_ERROR',
            });
        } else if (e instanceof Error) {
            throw error(500, {
                message: e.message,
                owlCode: 'GEN_ERROR',
            })
        } else {
            throw error(500, {
                message: "Unexpected error",
                owlCode: "UNKNOWN_ERR",
            })
        }
    }
}