import type { BookingDocumentReview } from './entities/booking-document-review.entity';
import type { BookingReviewNote } from './entities/booking-review-note.entity';
import type { FileRecord } from '../files/entities/file.entity';

/** One entry of a clearance document's per-card audit trail, oldest first. */
export interface ClearanceDocEvent {
  type: 'UPLOADED' | 'RESUBMITTED' | 'QUERIED' | 'APPROVED';
  at: string;
  byName: string | null;
  note: string | null;
}

/**
 * Query review notes are written as `Document "<fileKey>" queried: <note>`
 * (see BookingTransitionService.reviewDocument) — the only place a past query
 * decision survives after the customer re-uploads and the review row resets.
 */
const QUERY_NOTE_RE = /^Document "(.+?)" queried: ([\s\S]*)$/;

/**
 * Per-document audit trail assembled from data the flow already persists:
 * every stored file version (first = customer upload, later ones = the
 * customer's amendment responses), every query note (who opened it, when,
 * why), and the review row's current approval. Approvals that were later
 * reset by a re-upload are the one thing not kept anywhere — the trail shows
 * the decision that currently stands.
 */
export function buildClearanceDocHistory(input: {
  fileKey: string;
  /** All versions of all files on the booking, createdAt ASC, deleted included. */
  allVersions: FileRecord[];
  /** CHANGES_REQUESTED review notes for the booking. */
  queryNotes: BookingReviewNote[];
  review: BookingDocumentReview | null;
  /** staff id → display name. */
  names: Map<string, string>;
}): ClearanceDocEvent[] {
  const { fileKey, allVersions, queryNotes, review, names } = input;
  const events: ClearanceDocEvent[] = [];

  const versions = allVersions.filter((v) => v.code === fileKey);
  versions.forEach((v, i) => {
    events.push({
      type: i === 0 ? 'UPLOADED' : 'RESUBMITTED',
      at: v.createdAt.toISOString(),
      byName: v.uploadedByName ?? null,
      note: null,
    });
  });

  for (const n of queryNotes) {
    const m = QUERY_NOTE_RE.exec(n.note);
    if (!m || m[1] !== fileKey) continue;
    events.push({
      type: 'QUERIED',
      at: n.createdAt.toISOString(),
      byName: n.authorId ? (names.get(n.authorId) ?? null) : null,
      note: m[2] || null,
    });
  }

  if (review?.status === 'APPROVED' && review.reviewedAt) {
    events.push({
      type: 'APPROVED',
      at: review.reviewedAt.toISOString(),
      byName: review.reviewedByStaffId
        ? (names.get(review.reviewedByStaffId) ?? null)
        : null,
      note: null,
    });
  }

  return events.sort((a, b) => a.at.localeCompare(b.at));
}