import type { NormalizedItem, ScoredItem } from "./types.js";

const DEFAULT_TERMS = [
  "health", "technology", "agriculture", "primary production", "horticulture",
  "infrastructure", "economy", "employment", "trade", "climate", "energy",
  "transport", "earthquake", "food", "housing", "business", "environment"
];

function watchTerms() {
  return (process.env.WATCH_TERMS?.split(",") ?? DEFAULT_TERMS)
    .map((v) => v.trim().toLowerCase())
    .filter(Boolean);
}

export function scoreItem(item: NormalizedItem): ScoredItem {
  let score = 0;
  const reasons: string[] = [];
  const haystack = `${item.title} ${item.summary} ${item.topics.join(" ")}`.toLowerCase();

  const matches = watchTerms().filter((term) => haystack.includes(term)).slice(0, 5);
  if (matches.length) {
    score += Math.min(3, matches.length);
    reasons.push(`Matches watch terms: ${matches.join(", ")}`);
  }

  if (item.sourceId === "geonet") {
    const magnitude = Number(item.metrics?.magnitude ?? 0);
    const mmi = Number(item.metrics?.mmi ?? 0);
    if (magnitude >= 5) {
      score += 4;
      reasons.push(`Magnitude ${magnitude} earthquake`);
    } else if (magnitude >= 4) {
      score += 2;
      reasons.push(`Magnitude ${magnitude} earthquake`);
    }
    if (mmi >= 4) {
      score += 2;
      reasons.push(`Potentially notable shaking (MMI ${mmi})`);
    }
  }

  if (item.sourceId === "stats-nz") {
    score += 1;
    reasons.push("New or changed official statistical release");
  }

  if (item.sourceId === "parliament") {
    score += 1;
    reasons.push("New or changed parliamentary evidence/submission");
  }

  if (item.sourceId === "data-govt-nz") {
    score += 1;
    reasons.push("New or updated public dataset metadata");
  }

  if (item.sourceId === "treasury") {
    score += 1;
    reasons.push("New or updated Treasury publication");
  }

  if (item.sourceId === "rbnz") {
    score += 1;
    reasons.push("New or updated Reserve Bank statistical release");
  }

  if (item.sourceId === "mbie-jobs-online") {
    score += 1;
    reasons.push("New or updated MBIE labour-demand data");
  }

  if (item.sourceId === "companies-office") {
    score += 1;
    reasons.push("New or updated Companies Office business statistics");
  }

  if (item.sourceId === "nz-gazette") {
    score += 1;
    reasons.push("New official Gazette notice");
  }

  if (item.sourceId === "electricity-authority") {
    score += 1;
    reasons.push("New or updated Electricity Authority supply snapshot");
  }

  return { score, reasons };
}