/**
 * Integration tests for the per-berth PDF service (Phase 6b).
 *
 * Covers:
 *   - uploadBerthPdf creates a row + bumps the berth pointer.
 *   - Magic-byte rejection deletes the storage object.
 *   - reconcilePdfWithBerth classifies CRM-null → autoApplied, mismatch →
 *     conflicts, and respects the ±1% numeric tolerance.
 *   - Mooring-number mismatch surfaces as a warning (§14.6).
 *   - applyParseResults writes only allowlisted fields.
 *   - rollbackToVersion flips the current pointer without re-parsing.
 */

import { eq } from 'drizzle-orm';
import { afterEach, beforeEach, describe, expect, it } from 'vitest';

import {
  applyParseResults,
  reconcilePdfWithBerth,
  rollbackToVersion,
  uploadBerthPdf,
} from '@/lib/services/berth-pdf.service';
import type { ParseResult } from '@/lib/services/berth-pdf-parser';
import { db } from '@/lib/db';
import { berths, berthPdfVersions } from '@/lib/db/schema/berths';
import { systemSettings } from '@/lib/db/schema/system';

import { makeBerth, makePort } from '../helpers/factories';

// Drop the global `storage_backend` row so the factory falls back to the
// filesystem default when these tests run in isolation. (Other suites set it.)
beforeEach(async () => {
  await db
    .insert(systemSettings)
    .values({
      key: 'storage_backend',
      value: 'filesystem',
      portId: null,
      updatedBy: null,
    })
    .onConflictDoNothing();
});

afterEach(async () => {
  // No file cleanup needed — the filesystem backend writes to a tmp root.
});

function fakePdf(): Buffer {
  // Smallest possible byte sequence the magic-byte check accepts.
  return Buffer.concat([Buffer.from('%PDF-1.7\n'), Buffer.alloc(64, 0x20)]);
}

function parseResult(): ParseResult {
  return {
    engine: 'ocr',
    fields: {
      lengthFt: { value: 200, confidence: 0.9, engine: 'ocr' },
      bowFacing: { value: 'East', confidence: 0.9, engine: 'ocr' },
    },
    meanConfidence: 0.9,
    warnings: [],
  };
}

describe('uploadBerthPdf', () => {
  it('writes a version and updates currentPdfVersionId', async () => {
    const port = await makePort();
    const berth = await makeBerth({ portId: port.id });

    const result = await uploadBerthPdf({
      berthId: berth.id,
      buffer: fakePdf(),
      fileName: 'A1.pdf',
      uploadedBy: 'test-user',
      parseResult: parseResult(),
    });
    expect(result.versionNumber).toBe(1);
    expect(result.versionId).toMatch(/^[0-9a-f-]{36}$/);

    const refreshed = await db.query.berths.findFirst({ where: eq(berths.id, berth.id) });
    expect(refreshed?.currentPdfVersionId).toBe(result.versionId);

    const versionRow = await db.query.berthPdfVersions.findFirst({
      where: eq(berthPdfVersions.id, result.versionId),
    });
    expect(versionRow?.versionNumber).toBe(1);
    expect(versionRow?.fileName).toBe('A1.pdf');
    expect((versionRow?.parseResults as { engine: string }).engine).toBe('ocr');
  });

  it('rejects a buffer that fails the magic-byte check', async () => {
    const port = await makePort();
    const berth = await makeBerth({ portId: port.id });
    await expect(
      uploadBerthPdf({
        berthId: berth.id,
        buffer: Buffer.from('not a pdf at all'),
        fileName: 'spoof.pdf',
        uploadedBy: 'test-user',
      }),
    ).rejects.toThrow(/magic-byte/);
  });

  it('increments versionNumber on the second upload', async () => {
    const port = await makePort();
    const berth = await makeBerth({ portId: port.id });
    await uploadBerthPdf({
      berthId: berth.id,
      buffer: fakePdf(),
      fileName: 'v1.pdf',
      uploadedBy: 'test',
    });
    const second = await uploadBerthPdf({
      berthId: berth.id,
      buffer: fakePdf(),
      fileName: 'v2.pdf',
      uploadedBy: 'test',
    });
    expect(second.versionNumber).toBe(2);
  });
});

describe('reconcilePdfWithBerth', () => {
  it('auto-applies fields where the CRM column is null', async () => {
    const port = await makePort();
    const berth = await makeBerth({
      portId: port.id,
      overrides: { mooringNumber: 'A1', lengthFt: null, bowFacing: null },
    });
    const result = await reconcilePdfWithBerth(berth.id, {
      engine: 'ocr',
      fields: {
        lengthFt: { value: 200, confidence: 0.9, engine: 'ocr' },
        bowFacing: { value: 'East', confidence: 0.9, engine: 'ocr' },
      },
      meanConfidence: 0.9,
      warnings: [],
    });
    const fields = result.autoApplied.map((a) => a.field).sort();
    expect(fields).toEqual(['bowFacing', 'lengthFt']);
    expect(result.conflicts).toHaveLength(0);
  });

  it('flags conflicts when CRM and PDF disagree on a non-null value', async () => {
    const port = await makePort();
    const berth = await makeBerth({
      portId: port.id,
      overrides: { mooringNumber: 'A1', lengthFt: '100', bowFacing: 'West' },
    });
    const result = await reconcilePdfWithBerth(berth.id, {
      engine: 'ocr',
      fields: {
        lengthFt: { value: 200, confidence: 0.8, engine: 'ocr' },
        bowFacing: { value: 'East', confidence: 0.8, engine: 'ocr' },
      },
      meanConfidence: 0.8,
      warnings: [],
    });
    expect(result.conflicts.map((c) => c.field).sort()).toEqual(['bowFacing', 'lengthFt']);
  });

  it('treats a 0.5% numeric difference as equal (±1% tolerance)', async () => {
    const port = await makePort();
    const berth = await makeBerth({
      portId: port.id,
      overrides: { mooringNumber: 'A1', lengthFt: '200' },
    });
    const result = await reconcilePdfWithBerth(berth.id, {
      engine: 'ocr',
      fields: {
        lengthFt: { value: 201, confidence: 0.9, engine: 'ocr' }, // +0.5%
      },
      meanConfidence: 0.9,
      warnings: [],
    });
    expect(result.conflicts).toHaveLength(0);
    expect(result.autoApplied).toHaveLength(0);
  });

  it('warns when the PDF mooring number does not match the berth', async () => {
    const port = await makePort();
    const berth = await makeBerth({
      portId: port.id,
      overrides: { mooringNumber: 'A1' },
    });
    const result = await reconcilePdfWithBerth(berth.id, {
      engine: 'ocr',
      fields: {
        mooringNumber: { value: 'B5', confidence: 0.9, engine: 'ocr' },
      },
      meanConfidence: 0.9,
      warnings: [],
    });
    expect(result.warnings.some((w) => /B5/.test(w) && /A1/.test(w))).toBe(true);
  });
});

describe('applyParseResults', () => {
  it('updates only allowlisted fields and stamps appliedFields onto the version', async () => {
    const port = await makePort();
    const berth = await makeBerth({
      portId: port.id,
      overrides: { mooringNumber: 'A1', lengthFt: null, bowFacing: null },
    });
    const upload = await uploadBerthPdf({
      berthId: berth.id,
      buffer: fakePdf(),
      fileName: 'A1.pdf',
      uploadedBy: 'test',
    });

    await applyParseResults(berth.id, upload.versionId, {
      lengthFt: 200,
      bowFacing: 'East',
      // unknown / non-allowlisted column should be silently dropped:
      // @ts-expect-error — testing the allowlist
      hackThePlanet: 'pwn',
    });

    const refreshed = await db.query.berths.findFirst({ where: eq(berths.id, berth.id) });
    expect(refreshed?.lengthFt).toBe('200');
    expect(refreshed?.bowFacing).toBe('East');

    const versionRow = await db.query.berthPdfVersions.findFirst({
      where: eq(berthPdfVersions.id, upload.versionId),
    });
    const applied = (versionRow?.parseResults as { appliedFields?: string[] }).appliedFields;
    expect(applied).toEqual(expect.arrayContaining(['lengthFt', 'bowFacing']));
    expect(applied).not.toContain('hackThePlanet');
  });
});

describe('rollbackToVersion', () => {
  it('flips current_pdf_version_id to the requested version without re-parsing', async () => {
    const port = await makePort();
    const berth = await makeBerth({ portId: port.id });
    const v1 = await uploadBerthPdf({
      berthId: berth.id,
      buffer: fakePdf(),
      fileName: 'v1.pdf',
      uploadedBy: 'test',
    });
    const v2 = await uploadBerthPdf({
      berthId: berth.id,
      buffer: fakePdf(),
      fileName: 'v2.pdf',
      uploadedBy: 'test',
    });

    let refreshed = await db.query.berths.findFirst({ where: eq(berths.id, berth.id) });
    expect(refreshed?.currentPdfVersionId).toBe(v2.versionId);

    const result = await rollbackToVersion(berth.id, v1.versionId);
    expect(result.versionNumber).toBe(1);

    refreshed = await db.query.berths.findFirst({ where: eq(berths.id, berth.id) });
    expect(refreshed?.currentPdfVersionId).toBe(v1.versionId);
  });

  it('refuses to roll back to the already-current version', async () => {
    const port = await makePort();
    const berth = await makeBerth({ portId: port.id });
    const v1 = await uploadBerthPdf({
      berthId: berth.id,
      buffer: fakePdf(),
      fileName: 'v1.pdf',
      uploadedBy: 'test',
    });
    await expect(rollbackToVersion(berth.id, v1.versionId)).rejects.toThrow(/already current/);
  });
});