Interview Email Parser

// Web reference — Interview email parser (TypeScript)
export interface ParsedInterview {
  company?:         string;
  dateTime?:        Date;
  timeZoneName?:    string;
  meetingURL?:      string;
  meetingPlatform?: "zoom" | "meet" | "teams" | "phone";
  rawText:          string;
}

const PLATFORM_PATTERNS: [RegExp, "zoom" | "meet" | "teams"][] = [
  [/zoom\.us\/j\/[\d]+/i, "zoom"],
  [/meet\.google\.com\/[a-z-]+/i, "meet"],
  [/teams\.microsoft\.com\/l\/meetup/i, "teams"],
];

const TZ_MAP: Record<string, string> = {
  EST: "America/New_York", PST: "America/Los_Angeles",
  CST: "America/Chicago",  MST: "America/Denver",
  GMT: "Europe/London",    UTC: "UTC",
  AEST: "Australia/Sydney", SGT: "Asia/Singapore",
};

export function parseInterviewEmail(text: string): ParsedInterview {
  const result: ParsedInterview = { rawText: text };

  // Company
  const compMatch = text.match(/(?:at|with) the ([A-Z][A-Za-z ]+?) team/);
  if (compMatch) result.company = compMatch[1];

  // Meeting URL
  for (const [pattern, platform] of PLATFORM_PATTERNS) {
    const match = text.match(pattern);
    if (match) {
      result.meetingURL      = `https://${match[0]}`;
      result.meetingPlatform = platform;
      break;
    }
  }
  if (!result.meetingPlatform) result.meetingPlatform = "phone";

  // Time zone
  const tzMatch = text.match(/\b(EST|PST|CST|MST|GMT|UTC|AEST|SGT)\b/);
  if (tzMatch) result.timeZoneName = TZ_MAP[tzMatch[1]] ?? tzMatch[1];

  // Date — naive extraction, production should use date-fns or chrono-node
  const dateMatch = text.match(
    /(?:monday|tuesday|wednesday|thursday|friday|saturday|sunday)[,\s]+\w+ \d{1,2}(?:th|st|nd|rd)?/i
  );
  const timeMatch = text.match(/\d{1,2}(?::\d{2})?\s*(?:AM|PM)/i);
  if (dateMatch && timeMatch) {
    result.dateTime = new Date(`${dateMatch[0]} ${timeMatch[0]}`);
  }

  return result;
}