// Single frontend source of truth for the canonical job pipeline.
// Mirrors the backend JobPipeline (JobTrackerApi/Services/JobPipeline.cs); keep the two in sync.

export const PIPELINE_STATUSES = ["Applied", "Waiting", "Interview", "Offer", "Rejected", "Ghosted"] as const;

export type PipelineStatus = (typeof PIPELINE_STATUSES)[number];

export type StatusTone = "primary" | "info" | "success" | "warning" | "error" | "default";

// Legacy/synonym spellings collapse onto a canonical stage (matches the backend alias map).
const ALIASES: Record<string, PipelineStatus> = {
  interviewing: "Interview",
  interviews: "Interview",
  interviewed: "Interview",
  declined: "Rejected",
  "no response": "Ghosted",
  "no reply": "Ghosted",
  pending: "Waiting",
  "awaiting response": "Waiting",
};

/** Canonical status for a raw value, or "Other" for unknown/custom statuses. */
export function normalizeStatus(status?: string | null): PipelineStatus | "Other" {
  const trimmed = (status ?? "").trim();
  if (!trimmed) return "Applied";
  const exact = PIPELINE_STATUSES.find((s) => s.toLowerCase() === trimmed.toLowerCase());
  if (exact) return exact;
  const alias = ALIASES[trimmed.toLowerCase()];
  return alias ?? "Other";
}

/** MUI palette key for a status; both chip color and board accent derive from this. */
export function statusTone(status?: string | null): StatusTone {
  switch (normalizeStatus(status)) {
    case "Offer":
      return "success";
    case "Rejected":
      return "error";
    case "Waiting":
    case "Ghosted":
      return "warning";
    case "Interview":
      return "info";
    case "Applied":
      return "primary";
    default:
      return "default";
  }
}

const LABEL_KEYS: Record<PipelineStatus, string> = {
  Applied: "statusApplied",
  Waiting: "statusWaiting",
  Interview: "statusInterview",
  Offer: "statusOffer",
  Rejected: "statusRejected",
  Ghosted: "statusGhosted",
};

/** Localized label for a status, falling back to the raw value for custom statuses. */
export function statusLabel(t: (key: any, params?: any) => string, status: string): string {
  const normalized = normalizeStatus(status);
  return normalized === "Other" ? status : t(LABEL_KEYS[normalized]);
}