// Does a job match Rafael's profile? Title/company-level scoring, used to keep
// the Telegram digest to real leads instead of everything the scraper finds.
//
// Hard rejects encode standing decisions:
//   - Microsoft stack   (.NET/C#/Azure-first/Windows/SharePoint/Power Platform)
//   - Jobgether         (aggregator, not an employer)
//   - ALLPS             (postings require German despite passing the English filter)
//   - life-science domains (also filtered at fetch time by BIO_DOMAIN_RE)
//   - non-software functions (sales, HR, finance, marketing, support)

export const MS_STACK_RE =
  /\.net\b|\bc#|\basp\.net\b|sharepoint|dynamics\s*365|power\s*(?:platform|bi|apps|automate)|\bsccm\b|\bmecm\b|intune|autopilot|windows[\s\/]|\bm365\b|microsoft\s*365|\bazure\b/i;

export const WRONG_STACK_RE =
  /\bjava\b(?!script)|\bspring\s*boot\b|\bc\+\+\b|\bembedded\b|\bcobol\b|\babap\b|\bsap\b|\bdelphi\b/i;

export const BLOCKED_COMPANY_RE = /\bjobgether\b|\ballps\b/i;

export const BIO_RE =
  /\bbio(?:informatic|statistic|logic)\w*|\bpatholog\w*|\bgenomic\w*|\bproteomic\w*|\bGMP\b|\bMSAT\b|\bdrug\s+(?:discovery|design)\b|\bchemist(?:ry)?\b|\bclinical\s+(?:trial|research)\b|\bbiomarker\b|\bassay\b/i;

export const NON_SOFTWARE_RE =
  /\b(?:sales\s+(?:director|manager|representative)|account\s+(?:executive|manager)|business\s+development|recruit(?:er|ment)|talent\s+acquisition|marketing|copywriter|\bHR\b|human\s+resources|accountant|controller|auditor|receptionist|customer\s+(?:support|service)\s+agent|help\s?desk|service\s+desk|1st\s+level)\b/i;

/** Core stack and domains from cv/polo.md — each hit adds to the score. */
const SIGNALS: [RegExp, number, string][] = [
  [/\bpython\b/i, 3, "Python"],
  [/\btypescript\b|\bnode\.?js\b|\bjavascript\b/i, 3, "TS/Node"],
  [/\bruby\b|\brails\b/i, 4, "Ruby/Rails"],
  [/\breact\b/i, 2, "React"],
  [/\bplatform\s+engineer|\binfrastructure\s+engineer|\bsre\b|site\s+reliability/i, 4, "platform/SRE"],
  [/\bdevops\b|\bdevsecops\b|kubernetes|\bk8s\b|terraform|\bci\/cd\b/i, 4, "DevOps"],
  [/\bdata\s+(?:engineer|platform|pipeline)/i, 4, "data eng"],
  [/\bai\b|\bml\b|machine\s+learning|\bllm\b|\bgenai\b|\brag\b|mlops/i, 3, "AI/ML"],
  [/\bcloud\b|\baws\b|solutions?\s+architect/i, 3, "cloud/AWS"],
  [/\bsecurity\b/i, 2, "security"],
  [/\bbackend\b|\bfull.?stack\b|\bapi\b|\bintegration\b/i, 2, "backend/API"],
  [/forward\s+deployed|\bfield\s+engineer|solutions?\s+engineer|customer\s+engineer/i, 4, "forward-deployed"],
  [/\bsoftware\s+engineer\b|\bdeveloper\b/i, 2, "software"],
  // Tech Lead is an explicit target role (see CLAUDE.md), but a bare title like
  // "Technical Lead" or "Tech Lead" alone only ever hit the generic seniority
  // bucket below (2pts, same as "senior"/"staff") — below minScore(4), so it
  // silently never reached the digest. Give it its own weight so it clears
  // the bar on its own, same as the other role-specific signals above.
  [/\btech(?:nical)?\s*lead\b/i, 3, "tech lead"],
  // seniority — he's Staff-level; junior titles are already dropped upstream
  [/\b(?:senior|staff|principal|lead|head\s+of|architect)\b/i, 2, "senior"],
];

export interface Match {
  ok: boolean;
  score: number;
  reasons: string[];
  rejectedBy?: string;
}

export function matchesProfile(title: string, company = "", minScore = 4): Match {
  const t = `${title}`;
  if (BLOCKED_COMPANY_RE.test(company) || BLOCKED_COMPANY_RE.test(t))
    return { ok: false, score: 0, reasons: [], rejectedBy: "blocked company" };
  if (MS_STACK_RE.test(t)) return { ok: false, score: 0, reasons: [], rejectedBy: "Microsoft stack" };
  if (WRONG_STACK_RE.test(t)) return { ok: false, score: 0, reasons: [], rejectedBy: "wrong stack (Java/C++/SAP)" };
  if (BIO_RE.test(t)) return { ok: false, score: 0, reasons: [], rejectedBy: "life-science domain" };
  if (NON_SOFTWARE_RE.test(t)) return { ok: false, score: 0, reasons: [], rejectedBy: "non-software role" };

  let score = 0;
  const reasons: string[] = [];
  for (const [re, pts, label] of SIGNALS) {
    if (re.test(t)) {
      score += pts;
      reasons.push(label);
    }
  }
  return { ok: score >= minScore, score, reasons, rejectedBy: score >= minScore ? undefined : "weak match" };
}