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path: root/packages/frontend/src/lib/components/SystemPromptPanel.svelte
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<script lang="ts">
import { onMount } from "svelte";
import { appSettings } from "../settings.svelte.js";

const {
	apiBase = "",
}: {
	apiBase?: string;
} = $props();

const DEFAULT_PROMPT = "You are Dispatch, a helpful AI coding assistant. Be concise and helpful.";

async function loadPrompt(): Promise<void> {
	try {
		const res = await fetch(`${apiBase}/tabs/settings/system_prompt`);
		if (res.ok) {
			const data = (await res.json()) as { value: string | null };
			const value = data.value ?? DEFAULT_PROMPT;
			appSettings.systemPrompt = value;
			appSettings.savedSystemPrompt = value;
		}
	} catch {
		// ignore
	}
}

function resetPrompt(): void {
	appSettings.systemPrompt = appSettings.savedSystemPrompt;
}

const isDirty = $derived(appSettings.systemPrompt !== appSettings.savedSystemPrompt);

onMount(() => {
	if (!appSettings.systemPrompt) {
		appSettings.systemPrompt = DEFAULT_PROMPT;
		appSettings.savedSystemPrompt = DEFAULT_PROMPT;
	}
	loadPrompt();
});
</script>

<div class="flex flex-col gap-3 flex-1 min-h-0">
	<div class="text-xs font-semibold text-base-content/50 uppercase tracking-wide">System Prompt</div>
	<p class="text-xs text-base-content/40">The base instructions sent to the AI at the start of every conversation. Tool descriptions are appended automatically. Changes are applied when you send your next message.</p>

	<textarea
		class="textarea textarea-bordered w-full flex-1 min-h-32 text-xs font-mono leading-relaxed"
		bind:value={appSettings.systemPrompt}
		placeholder="Enter system prompt..."
	></textarea>

	<button
		class="btn btn-sm btn-ghost w-full"
		disabled={!isDirty}
		onclick={resetPrompt}
	>
		Reset
	</button>

	<p class="text-xs text-base-content/40">Warning: changing the system prompt will reset the AI's prompt cache for active conversations, which may increase usage costs.</p>
</div>