/**
 * Test helper: pre-seed `localStorage` with an active session that holds
 * one document + one representation, so an integration test can skip
 * the empty-state + upload flow and mount straight into a populated
 * Review/Forms layout.
 *
 * Pre-CE-WP-0005 integration tests clicked a "fixture button" in the
 * `CollectionList` to load a sample PDF; after the session refactor
 * there is no fixture list directly in the active-session UI. These
 * legacy tests now call `seedSessionWithDoc` in `beforeEach` instead.
 *
 * The seed bypasses `SessionService.create()` (which mints a random
 * id) so tests can reference the resulting `documentId` /
 * `representationId` synchronously, before the app boots.
 */

import type { Document, DocumentRepresentation } from "@shared/document";
import type { DocumentId, RepresentationId, SessionId } from "@shared/ids";
import type { Session } from "@shared/session";

export interface SeedOptions {
  readonly sessionName?: string;
  readonly documentTitle?: string;
  readonly canonicalText: string;
  readonly mode?: "review" | "forms";
}

export interface SeedResult {
  readonly sessionId: SessionId;
  readonly documentId: DocumentId;
  readonly representationId: RepresentationId;
}

function rid(prefix: string): string {
  return `${prefix}_seed_${Math.random().toString(36).slice(2, 10)}`;
}

export function seedSessionWithDoc(opts: SeedOptions): SeedResult {
  const sessionId = rid("sess") as SessionId;
  const documentId = rid("doc") as DocumentId;
  const representationId = rid("rep") as RepresentationId;
  const now = "2026-05-25T00:00:00.000Z";

  const session: Session = {
    id: sessionId,
    name: opts.sessionName ?? "Test Session",
    createdAt: now,
    updatedAt: now,
    lastOpenedAt: now,
  };

  const document: Document = {
    id: documentId,
    mediaType: "application/pdf",
    ...(opts.documentTitle ? { title: opts.documentTitle } : {}),
    fingerprint: "seed-fingerprint",
    createdAt: now,
    updatedAt: now,
  };

  const representation: DocumentRepresentation = {
    id: representationId,
    documentId,
    representationType: "pdf-text",
    contentHash: "seed-fingerprint",
    canonicalText: opts.canonicalText,
    pageMap: [{ page: 1, width: 595, height: 842 }],
    offsetMap: [
      {
        page: 1,
        globalStart: 0,
        globalEnd: opts.canonicalText.length,
        pageLength: opts.canonicalText.length,
      },
    ],
    generatedAt: now,
  };

  const snapshot = {
    version: 1,
    documents: [document],
    representations: [representation],
    annotations: [],
    evidenceItems: [],
  };

  const sessionsFile = {
    version: 1,
    sessions: [session],
    activeSessionId: sessionId,
  };

  localStorage.setItem("citation-evidence:sessions:v1", JSON.stringify(sessionsFile));
  localStorage.setItem("citation-evidence:active-session-id:v1", sessionId);
  localStorage.setItem(
    `citation-evidence:session:${sessionId}:engine-snapshot:v1`,
    JSON.stringify(snapshot),
  );
  localStorage.setItem(
    `citation-evidence:session:${sessionId}:active-document-id:v1`,
    documentId,
  );

  // Set the hash so the App routes straight into the session.
  const hash =
    opts.mode === "forms"
      ? `#/s/${sessionId}/forms/demo`
      : `#/s/${sessionId}`;
  history.replaceState(
    null,
    "",
    window.location.pathname + window.location.search + hash,
  );

  return { sessionId, documentId, representationId };
}