import { CATEGORIES } from "./catalog.ts";
import { validateNeed } from "./need.ts";
import type { AdNeed } from "./types.ts";
import type { AdContext } from "./types.ts";
/** Optional local rules. No network, no prompt logging. Ambiguous/unknown topics return null.
 * This is a starter taxonomy, not a safety classifier. The host still supplies age/consent/sensitive.
 */
const topics: Array<[AdContext["category"], RegExp]> = [
  [
    "education",
    /стипенди|хакатон|грант на обуч|языков.{0,12}курс|учебн.{0,8}курс|репетитор|scholarship|hackathon|language course|tutoring|шәкіртақы|оқу курс/iu,
  ],
  ["electronics", /ноутбук|смартфон|наушник|laptop|smartphone|headphones/iu],
  ["logistics", /курьер|грузоперевоз|courier|freight/iu],
  ["cleaning", /клининг|заказать уборку|cleaning service/iu],
  [
    "it_services",
    /разработк.{0,15}(?:сайт|приложен)|web development|app development/iu,
  ],
  [
    "industrial_marking",
    /маркиров|таңбалау|(?:нанос|печат|кодир).{0,60}(?:код|упаков|этикет)|(?:коды|штрихкод|этикетк).{0,60}(?:товар|продук|упаков)|industrial marking|product label|datamatrix|data matrix|serialization/iu,
  ],
  [
    "construction",
    /застройщик|новостройк|квартир|строительств|құрылыс|үй сал|construction|real estate|build a house/iu,
  ],
  [
    "interior",
    /интерьер|мебел|диван|кресл|sofa|couch|жиһаз|interior|furniture|kitchen design|дизайн кухни/iu,
  ],
  [
    "restaurants",
    /ресторан|кафе|где поесть|поужин|пообед|мейрамхана|қайда тамақ|restaurant|cafe|where to eat/iu,
  ],
  [
    "business_software",
    /\bcrm\b|\berp\b|бухгалтер|автоматизаци[яию] бизнеса|business software|accounting software/iu,
  ],
  [
    "travel",
    /авиабилет|рейс|отел[ьяи]|қонақүй|ұшақ билет|flight ticket|\bflight\b|airfare|hotel/iu,
  ],
  ["retail", /одежд|кроссовк|киім|аяқ киім|sneakers|clothing|shoes/iu],
  [
    "creative_tools",
    /генератор изображений|генератор видео|генератор музыки|image generator|video generator|music generator/iu,
  ],
];
export function classifyLocal(
  text: string,
): { category: AdContext["category"]; intent: AdContext["intent"] } | null {
  if (text.length > 16000) return null;
  const matched = topics.filter(([, pattern]) => pattern.test(text));
  if (matched.length !== 1) return null;
  const intent =
    /сгенерир|нарисуй|создай|сурет сал|жасап бер|generate|draw|create/iu.test(
      text,
    )
      ? "create"
      : /купить|купи(?=\s|$|[,!?])|заказать|закажи|нанять|сатып ал|тапсырыс|buy|purchase|hire|book a/iu.test(
            text,
          )
        ? "buy"
        : "research";
  return { category: matched[0]![0], intent };
}

export interface ConversationMessage {
  role: "user" | "assistant";
  content: string;
}
export interface ContextOpportunity {
  need?: AdNeed | undefined;
  category: AdContext["category"];
  intent: AdContext["intent"];
  confidence: number;
  shouldShow: boolean;
  source: "rules" | "model";
}
const SENSITIVE =
  /болит|лечени|диагноз|депресс|суиц|насили|секс|политик|религи|банкрот|кредит|health|medical|suicid|sexual|politic|religio|\bloan\b|ауру|денсаулық|саясат|қарыз/iu;
const COMMERCIAL =
  /платформ.{0,40}(?:возможност|хакатон|стипенди)|(?:найди|ищу|подбер|find|looking for).{0,45}(?:стипенди|хакатон|scholarship|hackathon)|поужин|поесть|пообед|нуж[еннаоы]|ищу|выб[оррат]|подбер|посовет|сравн|цен[аыу]|стоимост|бюджет|заказ|куп|услуг|оборудован|автоматиз|поставщик|need|looking for|recommend|compar|price|budget|buy|purchase|hire|керек|іздеп|сатып|баға|салыстыр/iu;
const FOLLOWUP =
  /^(а(?:\s|,|$)|ал(?:\s|,|$)|and\b|what about\b)|подешевле|дешевле|вариант|бюджет|до\s*\d|подойд[её]т|для моего|подробнее|cheaper|alternative|арзан|басқа/iu;
const OFFTOPIC =
  /^(привет|салам|сәлем|спасибо|рахмет|thanks|hello|hi\b|как дела)|реши\s+(задач|пример)|напиши\s+(эссе|стих)|объясни|что такое|что значит|определени|what is|define\b/iu;
const REFUSAL =
  /вне моей компетенции|не могу помочь|не специализир|cannot help|can't help|outside my scope/iu;
const GREETING =
  /^(?:привет|салам|сәлем|здравствуй(?:те)?|hello|hi)(?:\s*[,!.:—-]\s*|\s+|$)/iu;
// Conservative exclusions for tasks the starter offer taxonomy cannot fulfill.
// These rules reduce known mistakes; they do not establish semantic accuracy.
const NONCOMMERCIAL =
  /доклад|реферат|домашн(?:ее|яя|юю) задан|для школы|\b(?:essay|homework|school report)\b|баяндама|үй тапсырма/iu;
const NO_PURCHASE =
  /не\s+(?:хочу|нужно|надо|собираюсь).{0,60}(?:куп|покуп|заказ)|(?:куп|покуп|заказ).{0,30}не\s+(?:хочу|нужно|надо)|\b(?:don't|do not|not looking to).{0,40}\b(?:buy|purchase|order)\b|сатып алғым келмейді/iu;
/** Reads a short recent window locally. No raw conversation is sent to Contexta. */
export function analyzeConversation(
  messages: ConversationMessage[],
): ContextOpportunity | null {
  const turns = messages
    .filter((m) => m.role === "user" || m.role === "assistant")
    .slice(-8);
  if (
    turns.some((m) => typeof m.content !== "string" || m.content.length > 8000)
  )
    return null;
  const users = turns.filter((m) => m.role === "user");
  const last = users.at(-1);
  const lastText = last?.content.trim().replace(GREETING, "").trim() ?? "";
  if (
    !last ||
    SENSITIVE.test(turns.map((m) => m.content).join("\n")) ||
    OFFTOPIC.test(lastText) ||
    NONCOMMERCIAL.test(lastText) ||
    NO_PURCHASE.test(lastText) ||
    (/ремонт|перетяжк|\brepair\b/iu.test(lastText) &&
      classifyLocal(lastText)?.category === "interior")
  )
    return null;
  const latest = turns.at(-1);
  if (latest?.role === "assistant" && REFUSAL.test(latest.content)) return null;
  const direct = classifyLocal(last.content);
  if (direct && (COMMERCIAL.test(last.content) || direct.intent === "create"))
    return { ...direct, confidence: 0.92, shouldShow: true, source: "rules" };
  if (direct) {
    const previousNeed = users.at(-2);
    const lastUserIndex = turns.lastIndexOf(last);
    const clarification = turns.slice(0, lastUserIndex).at(-1);
    const previousTopic = previousNeed
      ? classifyLocal(previousNeed.content)
      : null;
    if (
      previousNeed &&
      COMMERCIAL.test(previousNeed.content) &&
      clarification?.role === "assistant" &&
      /уточн|како[йеую]|что именно|what|which/iu.test(clarification.content) &&
      (!previousTopic || previousTopic.category === direct.category)
    ) {
      return { ...direct, confidence: 0.85, shouldShow: true, source: "rules" };
    }
  }
  if (FOLLOWUP.test(last.content)) {
    // Previous *user* topics only; do not adopt advertising suggestions from assistant text.
    for (const previous of users.slice(-4, -1).reverse()) {
      if (OFFTOPIC.test(previous.content) || SENSITIVE.test(previous.content))
        break;
      const topic = classifyLocal(previous.content);
      if (
        topic &&
        (COMMERCIAL.test(previous.content) || topic.intent === "create")
      )
        return {
          ...topic,
          confidence: 0.85,
          shouldShow: true,
          source: "rules",
        };
      // Explicit different topic breaks continuity rather than searching indefinitely.
      if (previous.content.trim().length > 80) break;
    }
  }
  return null;
}
export function validateOpportunity(value: unknown): ContextOpportunity | null {
  if (!value || typeof value !== "object") return null;
  const r = value as Record<string, unknown>;
  const categories: readonly string[] = CATEGORIES;
  if (
    !categories.includes(r["category"] as AdContext["category"]) ||
    !["buy", "research", "create"].includes(String(r["intent"])) ||
    typeof r["shouldShow"] !== "boolean" ||
    typeof r["confidence"] !== "number" ||
    !Number.isFinite(r["confidence"]) ||
    r["confidence"] < 0 ||
    r["confidence"] > 1
  )
    return null;
  const need = r["need"] === undefined ? undefined : validateNeed(r["need"]);
  if (need === null) return null;
  return {
    ...(need ? { need } : {}),
    category: r["category"] as AdContext["category"],
    intent: r["intent"] as AdContext["intent"],
    shouldShow: r["shouldShow"],
    confidence: r["confidence"],
    source: "model",
  };
}