ai generated tasks check for duplicates, existing streaks, and more before creation

lib/ai-task-generation.ts

@@ -0,0 +1,34 @@
+import type { AiTaskContext } from "@/lib/ai-task-context";
+
+export const MAX_DAILY_AI_TASKS = 5;
+
+export type AiTaskGenerationOptions = {
+  excludeLabels?: string[];
+  maxCount?: number;
+};
+
+export function getGenerationSlotCount(
+  carryOverCount: number,
+  maxCount = MAX_DAILY_AI_TASKS,
+) {
+  return Math.max(0, maxCount - carryOverCount);
+}
+
+export function buildGenerationUserPrompt(
+  context: AiTaskContext,
+  options?: AiTaskGenerationOptions,
+) {
+  const maxCount = options?.maxCount ?? MAX_DAILY_AI_TASKS;
+  const excludeLabels = options?.excludeLabels ?? [];
+
+  if (excludeLabels.length === 0) {
+    return `Generate today's personalized habit task labels as a JSON array of up to ${maxCount} strings.`;
+  }
+
+  return [
+    `Generate exactly ${maxCount} NEW habit task labels as a JSON array of strings.`,
+    "Do not repeat or rephrase any of these existing tasks the user already has:",
+    ...excludeLabels.map((label) => `- ${label}`),
+    "Use different wording only for genuinely different activities.",
+  ].join("\n");
+}