Add train headcode search

src/app.d.ts

@@ -2,7 +2,10 @@
 // for information about these interfaces
 declare global {
 	namespace App {
-		// interface Error {}
+		interface Error {
+			message: string;
+			owlCode?: string;
+		}
 		// interface Locals {}
 		// interface PageData {}
 		// interface PageState {}

src/lib/components/ui/cards/HeadcodeSearchCard.svelte

@@ -0,0 +1,45 @@
+<script lang="ts">
+    import { goto } from '$app/navigation';
+	import BaseCard from '$lib/components/ui/cards/BaseCard.svelte';
+	import Textbox from '$lib/components/ui/Textbox.svelte';
+	import Button from '$lib/components/ui/Button.svelte';
+
+	let headcode = $state('');
+
+    function handleSearch(e: SubmitEvent) {
+        e.preventDefault();
+        if (!headcode.trim()) return;
+
+        const searchParams = new URLSearchParams();
+        searchParams.append('h', headcode.trim().toUpperCase());
+
+        goto(`/trains?${searchParams.toString()}`)
+    }
+</script>
+
+<BaseCard header={'Search Train & PIS'}>
+
+        <form onsubmit={handleSearch} class="card-content">
+		<Textbox 
+            placeholder="Enter Headcode"
+            bind:value={headcode}
+            maxLength={4}
+        />
+        <Button
+            type="submit"
+            disabled={!headcode}
+        >Search</Button>
+</form>
+</BaseCard>
+
+<style>
+	.card-content {
+		text-align: center;
+		width: 90%;
+		margin: auto;
+		padding: 10px 0 10px 0;
+        display: flex;
+        flex-direction: column;
+        gap: 0.75rem;
+	}
+</style>

src/routes/+page.svelte

@@ -1,11 +1,13 @@
 <script lang="ts">
 	import LocationBoardCard from '$lib/components/ui/cards/LocationBoardCard.svelte';
+	import HeadcodeSearchCard from '$lib/components/ui/cards/HeadcodeSearchCard.svelte';
 	import NearbyStationsCard from '$lib/components/ui/cards/NearbyStationsCard.svelte';
 	import QuickLinksCard from '$lib/components/ui/cards/QuickLinksCard.svelte';
 </script>
 
 <div class="card-container">
 	<LocationBoardCard />
+	<HeadcodeSearchCard />
 	<NearbyStationsCard />
 	<QuickLinksCard />
 </div>

src/routes/trains/+page.svelte

@@ -0,0 +1,12 @@
+<script lang="ts">
+	let { data } = $props();
+</script>
+<pre>{JSON.stringify(data.results, null, 1)}</pre>
+<style>
+	pre {
+        background: #1e1e1e;
+        color: #00ff00;
+        padding: 1rem;
+        overflow: auto;
+    }
+</style>

src/routes/trains/+page.ts

@@ -0,0 +1,55 @@
+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(20, {
+                message: e.message,
+                owlCode: 'GEN_ERROR',
+            })
+        } else {
+            throw error(500, {
+                message: "Unexpected error",
+                owlCode: "UNKNOWN_ERR",
+            })
+        }
+    }
+}