/**
 * Development/Test fixture seeding. Idempotent: running it twice must not
 * duplicate anything. Never run against production data.
 *
 * Fixture matrix (documented in apps/web/e2e/README.md):
 *   fixture-admin    active, Site Admin
 *   fixture-user     active, regular account
 *   fixture-editor   active, regular account (a second non-admin for the
 *                    collab permission packs: reader/editor of another's pond)
 *   fixture-viewer   active, regular account, never a member (for the
 *                    `authenticated`/`public` access-rule cases, issue #55)
 *   fixture-pending  registered but e-mail not verified
 *
 * All fixture accounts share the password below — they exist only on
 * dev machines and disposable CI/Test databases. On shared stages
 * (test/int), set FIXTURE_ADMIN_PASSWORD / FIXTURE_USER_PASSWORD to give
 * those two accounts non-public passwords.
 *
 * Content fixtures (issue #32): a shared pond owned by fixture-user with
 * two pages — "Every Element" (every editor schema node/mark, #24, loaded
 * from the checked-in `fixtures/content-page.yjs`; regenerate via
 * `pnpm --filter @dorfteich/api fixtures:regenerate` after editing
 * `fixtures/content-page.md`) and "Fixture Image" (one real, servable
 * uploaded image) — for the content regression pack and manual QA.
 */
import { readFileSync } from 'node:fs';
import { mkdir, writeFile } from 'node:fs/promises';
import { join } from 'node:path';

import {
  docToHtml,
  docToMarkdown,
  docToPlainText,
  editorSchema,
  extractOutline,
  slugify,
} from '@dorfteich/shared';
import { Prisma, PrismaClient, UserStatus } from '@prisma/client';
import { generateKeyBetween } from 'fractional-indexing';
import { prosemirrorJSONToYXmlFragment, yXmlFragmentToProseMirrorRootNode } from 'y-prosemirror';
import * as Y from 'yjs';
import { Node as ProseMirrorNode } from 'prosemirror-model';

import { hashPassword } from '../src/users/password';

export const FIXTURE_PASSWORD = 'fixture passwort 123';

const PASSWORD_OVERRIDES: Record<string, string | undefined> = {
  'fixture-admin': process.env.FIXTURE_ADMIN_PASSWORD,
  'fixture-user': process.env.FIXTURE_USER_PASSWORD,
};

const prisma = new PrismaClient();

interface FixtureUser {
  username: string;
  displayName: string;
  status: UserStatus;
  isSiteAdmin: boolean;
}

const FIXTURES: FixtureUser[] = [
  { username: 'fixture-admin', displayName: 'Fixture Admin', status: 'ACTIVE', isSiteAdmin: true },
  { username: 'fixture-user', displayName: 'Fixture User', status: 'ACTIVE', isSiteAdmin: false },
  {
    username: 'fixture-editor',
    displayName: 'Fixture Editor',
    status: 'ACTIVE',
    isSiteAdmin: false,
  },
  {
    // A signed-in, non-admin, non-member account: for `authenticated`/`public`
    // access-rule cases (issue #55) where the viewer must be no one's member.
    username: 'fixture-viewer',
    displayName: 'Fixture Viewer',
    status: 'ACTIVE',
    isSiteAdmin: false,
  },
  {
    // The "foreign user" of the permission matrix (issue #60): signed in, but
    // a member of nothing — should see 404 everywhere.
    username: 'fixture-outsider',
    displayName: 'Fixture Outsider',
    status: 'ACTIVE',
    isSiteAdmin: false,
  },
  {
    username: 'fixture-pending',
    displayName: 'Fixture Pending',
    status: 'PENDING_VERIFICATION',
    isSiteAdmin: false,
  },
];

/**
 * Every pond needs its owner's Pond Admin grant — access is decided solely
 * by role_grants from M5 on (issue #52). Idempotent, matching the
 * owner_admin_grants migration backfill.
 */
async function ensureOwnerAdminGrant(pondId: string, ownerId: string): Promise<void> {
  const existing = await prisma.roleGrant.findFirst({
    where: {
      pondId,
      subjectType: 'USER',
      subjectId: ownerId,
      role: 'POND_ADMIN',
      scopeType: 'POND',
    },
    select: { id: true },
  });
  if (existing) return;
  await prisma.roleGrant.create({
    data: {
      pondId,
      subjectType: 'USER',
      subjectId: ownerId,
      role: 'POND_ADMIN',
      scopeType: 'POND',
      scopeId: null,
      effect: 'ALLOW',
      createdBy: ownerId,
    },
  });
}

async function upsertFixtureUser(fixture: FixtureUser): Promise<string> {
  const email = `${fixture.username}@dorfteich.test`;
  const user = await prisma.user.upsert({
    where: { username: fixture.username },
    create: {
      username: fixture.username,
      email,
      displayName: fixture.displayName,
      locale: 'de',
      status: fixture.status,
      isSiteAdmin: fixture.isSiteAdmin,
      emailVerifiedAt: fixture.status === 'ACTIVE' ? new Date() : null,
    },
    update: {
      status: fixture.status,
      isSiteAdmin: fixture.isSiteAdmin,
    },
  });
  // Re-hash on every run so a changed override takes effect on re-seed.
  const credential = await hashPassword(PASSWORD_OVERRIDES[fixture.username] ?? FIXTURE_PASSWORD);
  await prisma.userIdentity.upsert({
    where: { provider_subject: { provider: 'password', subject: user.id } },
    create: {
      userId: user.id,
      provider: 'password',
      subject: user.id,
      credential,
    },
    update: { credential },
  });
  // Active accounts get their personal pond, mirroring what e-mail
  // verification does for real signups (issue #21).
  if (fixture.status === 'ACTIVE') {
    const existing = await prisma.pond.findFirst({
      where: { ownerId: user.id, type: 'PERSONAL' },
      select: { id: true },
    });
    const pondId =
      existing?.id ??
      (
        await prisma.pond.create({
          data: {
            slug: slugify(fixture.displayName) || fixture.username,
            name: fixture.displayName,
            type: 'PERSONAL',
            ownerId: user.id,
          },
        })
      ).id;
    // Also for a pre-existing pond: a dev database shared with test suites can
    // lose the owner grant to a cleanup — re-seeding must heal it (the seed's
    // documented contract is "idempotent", not "first run only").
    await ensureOwnerAdminGrant(pondId, user.id);
    // The instance default for additional_ponds is 0 (ADR 0011) — give
    // the fixtures headroom so pond flows are exercisable in dev/e2e.
    await prisma.quotaOverride.upsert({
      where: {
        subjectType_subjectId_quotaKey: {
          subjectType: 'USER',
          subjectId: user.id,
          quotaKey: 'additional_ponds',
        },
      },
      create: {
        subjectType: 'USER',
        subjectId: user.id,
        quotaKey: 'additional_ponds',
        value: 100,
      },
      update: { value: 100 },
    });
  }
  return user.id;
}

interface DerivedContent {
  plainText: string;
  markdown: string;
  html: string;
  outline: Prisma.InputJsonValue;
}

function deriveContentOf(doc: ProseMirrorNode): DerivedContent {
  return {
    plainText: docToPlainText(doc),
    markdown: docToMarkdown(doc),
    html: docToHtml(doc),
    outline: extractOutline(doc) as unknown as Prisma.InputJsonValue,
  };
}

function docFromYjsState(state: Uint8Array): ProseMirrorNode {
  const ydoc = new Y.Doc();
  Y.applyUpdate(ydoc, state);
  const doc = yXmlFragmentToProseMirrorRootNode(ydoc.getXmlFragment('default'), editorSchema);
  ydoc.destroy();
  return doc;
}

async function upsertFixturePage(
  pondId: string,
  slug: string,
  title: string,
  ownerId: string,
  state: Uint8Array,
  content: DerivedContent,
): Promise<string> {
  const existing = await prisma.page.findFirst({ where: { pondId, slug }, select: { id: true } });
  if (existing) {
    await prisma.page.update({
      where: { id: existing.id },
      data: {
        ydocState: state,
        contentCache: { upsert: { create: content, update: content } },
      },
    });
    return existing.id;
  }
  const last = await prisma.page.findFirst({
    where: { pondId },
    orderBy: { sortKey: 'desc' },
    select: { sortKey: true },
  });
  const page = await prisma.page.create({
    data: {
      pondId,
      title,
      slug,
      sortKey: generateKeyBetween(last?.sortKey ?? null, null),
      ydocState: state,
      createdBy: ownerId,
      contentCache: { create: content },
    },
  });
  return page.id;
}

const FIXTURE_POND_SLUG = 'content-fixtures';
// 1x1 transparent PNG — only the magic bytes matter for a real, servable
// (if visually trivial) fixture image.
const FIXTURE_IMAGE_PNG_BASE64 =
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=';
const FIXTURE_IMAGE_ID = '00000000-0000-4000-8000-000000000001';

/** Shared content pond + fixture pages (issue #32). */
async function seedContentFixtures(ownerId: string): Promise<void> {
  let pond = await prisma.pond.findUnique({ where: { slug: FIXTURE_POND_SLUG } });
  if (!pond) {
    pond = await prisma.pond.create({
      data: {
        slug: FIXTURE_POND_SLUG,
        name: 'Content Fixtures',
        type: 'SHARED',
        ownerId,
      },
    });
  }
  await ensureOwnerAdminGrant(pond.id, ownerId);
  await prisma.quotaOverride.upsert({
    where: {
      subjectType_subjectId_quotaKey: {
        subjectType: 'POND',
        subjectId: pond.id,
        quotaKey: 'storage_bytes',
      },
    },
    create: {
      subjectType: 'POND',
      subjectId: pond.id,
      quotaKey: 'storage_bytes',
      value: 100 * 1024 * 1024,
    },
    update: { value: 100 * 1024 * 1024 },
  });

  // "Every Element": the checked-in Yjs snapshot regenerated from
  // fixtures/content-page.md — covers every editor schema node/mark (#24).
  const everyElementState = readFileSync(join(__dirname, 'fixtures/content-page.yjs'));
  const everyElementDoc = docFromYjsState(everyElementState);
  await upsertFixturePage(
    pond.id,
    'every-element',
    'Every Element',
    ownerId,
    new Uint8Array(everyElementState),
    deriveContentOf(everyElementDoc),
  );

  // "Classified Note" (issue #206, ADR 0022): a VS-NfD-marked page so e2e
  // (a11y pack) can assert the marking banner in both themes. Kept simple —
  // the marking, not the content, is what the fixture exists for.
  const classifiedDoc = editorSchema.node('doc', null, [
    editorSchema.node('heading', { level: 1 }, [editorSchema.text('Classified Note')]),
    editorSchema.node('paragraph', null, [
      editorSchema.text('This fixture page carries the VS-NfD marking.'),
    ]),
  ]);
  const classifiedYdoc = new Y.Doc();
  prosemirrorJSONToYXmlFragment(
    editorSchema,
    classifiedDoc.toJSON(),
    classifiedYdoc.getXmlFragment('default'),
  );
  const classifiedState = new Uint8Array(Y.encodeStateAsUpdate(classifiedYdoc));
  classifiedYdoc.destroy();
  const classifiedPageId = await upsertFixturePage(
    pond.id,
    'classified-note',
    'Classified Note',
    ownerId,
    classifiedState,
    deriveContentOf(classifiedDoc),
  );
  await prisma.page.update({
    where: { id: classifiedPageId },
    data: { classification: 'VS_NFD' },
  });

  // "Fixture Image": one real, servable uploaded image (the Markdown
  // fixture above only carries a placeholder fileId for round-trip
  // testing — this is the one that actually resolves via /media/:fileId).
  const uploadsDir = process.env.UPLOADS_DIR ?? './data/uploads';
  const imageBytes = Buffer.from(FIXTURE_IMAGE_PNG_BASE64, 'base64');
  await mkdir(join(uploadsDir, pond.id), { recursive: true });
  await writeFile(join(uploadsDir, pond.id, FIXTURE_IMAGE_ID), imageBytes);
  await prisma.attachment.upsert({
    where: { id: FIXTURE_IMAGE_ID },
    create: {
      id: FIXTURE_IMAGE_ID,
      pondId: pond.id,
      fileName: 'fixture.png',
      mimeType: 'image/png',
      sizeBytes: imageBytes.length,
      storagePath: `${pond.id}/${FIXTURE_IMAGE_ID}`,
      uploadedBy: ownerId,
    },
    update: {},
  });
  await prisma.pondUsage.upsert({
    where: { pondId: pond.id },
    create: { pondId: pond.id, storageBytesUsed: imageBytes.length },
    update: {},
  });

  const imageDoc = editorSchema.node('doc', null, [
    editorSchema.node('heading', { level: 1 }, [editorSchema.text('Fixture Image')]),
    editorSchema.node('paragraph', null, [
      editorSchema.node('image', {
        fileId: FIXTURE_IMAGE_ID,
        alt: 'A tiny fixture image',
        width: null,
      }),
    ]),
  ]);
  const imageYdoc = new Y.Doc();
  prosemirrorJSONToYXmlFragment(
    editorSchema,
    imageDoc.toJSON(),
    imageYdoc.getXmlFragment('default'),
  );
  const imageState = new Uint8Array(Y.encodeStateAsUpdate(imageYdoc));
  imageYdoc.destroy();

  const imagePageId = await upsertFixturePage(
    pond.id,
    'fixture-image',
    'Fixture Image',
    ownerId,
    imageState,
    deriveContentOf(imageDoc),
  );
  await prisma.attachment.update({
    where: { id: FIXTURE_IMAGE_ID },
    data: { pageId: imagePageId },
  });
}

async function main(): Promise<void> {
  // Fresh rate-limit budget for e2e runs — seed targets are always
  // disposable dev/CI databases, never production.
  await prisma.rateLimit.deleteMany({});
  let contentOwnerId: string | undefined;
  for (const fixture of FIXTURES) {
    const userId = await upsertFixtureUser(fixture);
    if (fixture.username === 'fixture-user') contentOwnerId = userId;
  }
  if (contentOwnerId) await seedContentFixtures(contentOwnerId);
  // Seeded environments are configured by definition: mark the first-run
  // setup wizard (issue #80) as completed so e2e stacks and stages never
  // hit the setup gate. Never overwrite an existing (real) completion.
  const setupMarker = await prisma.instanceSetting.findUnique({
    where: { key: 'setup.completedAt' },
  });
  if (!setupMarker) {
    await prisma.instanceSetting.create({
      data: { key: 'setup.completedAt', value: new Date().toISOString() },
    });
  }
  await prisma.instanceSetting.upsert({
    where: { key: 'seed.marker' },
    create: { key: 'seed.marker', value: { seededAt: new Date().toISOString() } },
    update: { value: { seededAt: new Date().toISOString() } },
  });
  console.log(`seed: done (${FIXTURES.length} fixture users)`);
}

main()
  .catch((error) => {
    console.error(error);
    process.exitCode = 1;
  })
  .finally(() => prisma.$disconnect());