/**
 * Invoice extraction test using MiniCPM-V (visual extraction)
 *
 * Consensus approach:
 * 1. Pass 1: Fast JSON extraction
 * 2. Pass 2: Confirm with thinking enabled
 * 3. If mismatch: repeat until consensus or max attempts
 */
import { tap, expect } from '@git.zone/tstest/tapbundle';
import * as fs from 'fs';
import * as path from 'path';
import { execSync } from 'child_process';
import * as os from 'os';
import { ensureMiniCpm } from './helpers/docker.js';

const OLLAMA_URL = 'http://localhost:11434';
const MODEL = 'openbmb/minicpm-v4.5:q8_0';

interface IInvoice {
  invoice_number: string;
  invoice_date: string;
  vendor_name: string;
  currency: string;
  net_amount: number;
  vat_amount: number;
  total_amount: number;
}

/**
 * Convert PDF to PNG images using ImageMagick
 */
function convertPdfToImages(pdfPath: string): string[] {
  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pdf-convert-'));
  const outputPattern = path.join(tempDir, 'page-%d.png');

  try {
    execSync(
      `convert -density 300 -quality 95 "${pdfPath}" -background white -alpha remove "${outputPattern}"`,
      { stdio: 'pipe' }
    );

    const files = fs.readdirSync(tempDir).filter((f) => f.endsWith('.png')).sort();
    const images: string[] = [];

    for (const file of files) {
      const imagePath = path.join(tempDir, file);
      const imageData = fs.readFileSync(imagePath);
      images.push(imageData.toString('base64'));
    }

    return images;
  } finally {
    fs.rmSync(tempDir, { recursive: true, force: true });
  }
}

const JSON_PROMPT = `Extract invoice data from this image. Return ONLY a JSON object with these exact fields:
{
  "invoice_number": "the invoice number (not VAT ID, not customer ID)",
  "invoice_date": "YYYY-MM-DD format",
  "vendor_name": "company that issued the invoice",
  "currency": "EUR, USD, or GBP",
  "net_amount": 0.00,
  "vat_amount": 0.00,
  "total_amount": 0.00
}
Return only the JSON, no explanation.`;

/**
 * Query MiniCPM-V for JSON output (fast, no thinking)
 */
async function queryJsonFast(images: string[]): Promise<string> {
  const response = await fetch(`${OLLAMA_URL}/api/chat`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      model: MODEL,
      messages: [{
        role: 'user',
        content: JSON_PROMPT,
        images: images,
      }],
      stream: false,
      options: {
        num_predict: 1000,
        temperature: 0.1,
      },
    }),
  });

  if (!response.ok) {
    throw new Error(`Ollama API error: ${response.status}`);
  }

  const data = await response.json();
  return (data.message?.content || '').trim();
}

/**
 * Query MiniCPM-V for JSON output with thinking enabled (slower, more accurate)
 */
async function queryJsonWithThinking(images: string[]): Promise<string> {
  const response = await fetch(`${OLLAMA_URL}/api/chat`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      model: MODEL,
      messages: [{
        role: 'user',
        content: `Think carefully about this invoice image, then ${JSON_PROMPT}`,
        images: images,
      }],
      stream: false,
      options: {
        num_predict: 2000,
        temperature: 0.1,
      },
    }),
  });

  if (!response.ok) {
    throw new Error(`Ollama API error: ${response.status}`);
  }

  const data = await response.json();
  return (data.message?.content || '').trim();
}

/**
 * Parse amount from string (handles European format)
 */
function parseAmount(s: string | number | undefined): number {
  if (s === undefined || s === null) return 0;
  if (typeof s === 'number') return s;
  const match = s.match(/([\d.,]+)/);
  if (!match) return 0;
  const numStr = match[1];
  // Handle European format: 1.234,56 → 1234.56
  const normalized = numStr.includes(',') && numStr.indexOf(',') > numStr.lastIndexOf('.')
    ? numStr.replace(/\./g, '').replace(',', '.')
    : numStr.replace(/,/g, '');
  return parseFloat(normalized) || 0;
}

/**
 * Extract invoice number from potentially verbose response
 */
function extractInvoiceNumber(s: string | undefined): string {
  if (!s) return '';
  let clean = s.replace(/\*\*/g, '').replace(/`/g, '').trim();
  const patterns = [
    /\b([A-Z]{2,3}\d{10,})\b/i,           // IEE2022006460244
    /\b([A-Z]\d{8,})\b/i,                  // R0014359508
    /\b(INV[-\s]?\d{4}[-\s]?\d+)\b/i,     // INV-2024-001
    /\b(\d{7,})\b/,                        // 1579087430
  ];
  for (const pattern of patterns) {
    const match = clean.match(pattern);
    if (match) return match[1];
  }
  return clean.replace(/[^A-Z0-9-]/gi, '').trim() || clean;
}

/**
 * Extract date (YYYY-MM-DD) from response
 */
function extractDate(s: string | undefined): string {
  if (!s) return '';
  let clean = s.replace(/\*\*/g, '').replace(/`/g, '').trim();
  const isoMatch = clean.match(/(\d{4}-\d{2}-\d{2})/);
  if (isoMatch) return isoMatch[1];
  // Try DD/MM/YYYY or DD.MM.YYYY
  const dmyMatch = clean.match(/(\d{1,2})[\/.](\d{1,2})[\/.](\d{4})/);
  if (dmyMatch) {
    return `${dmyMatch[3]}-${dmyMatch[2].padStart(2, '0')}-${dmyMatch[1].padStart(2, '0')}`;
  }
  return clean.replace(/[^\d-]/g, '').trim();
}

/**
 * Extract currency
 */
function extractCurrency(s: string | undefined): string {
  if (!s) return 'EUR';
  const upper = s.toUpperCase();
  if (upper.includes('EUR') || upper.includes('€')) return 'EUR';
  if (upper.includes('USD') || upper.includes('$')) return 'USD';
  if (upper.includes('GBP') || upper.includes('£')) return 'GBP';
  return 'EUR';
}

/**
 * Extract JSON from response (handles markdown code blocks)
 */
function extractJsonFromResponse(response: string): Record<string, unknown> | null {
  // Try to find JSON in markdown code block
  const codeBlockMatch = response.match(/```(?:json)?\s*([\s\S]*?)```/);
  const jsonStr = codeBlockMatch ? codeBlockMatch[1].trim() : response.trim();

  try {
    return JSON.parse(jsonStr);
  } catch {
    // Try to find JSON object pattern
    const jsonMatch = jsonStr.match(/\{[\s\S]*\}/);
    if (jsonMatch) {
      try {
        return JSON.parse(jsonMatch[0]);
      } catch {
        return null;
      }
    }
    return null;
  }
}

/**
 * Parse JSON response into IInvoice
 */
function parseJsonToInvoice(response: string): IInvoice | null {
  const parsed = extractJsonFromResponse(response);
  if (!parsed) return null;

  return {
    invoice_number: extractInvoiceNumber(String(parsed.invoice_number || '')),
    invoice_date: extractDate(String(parsed.invoice_date || '')),
    vendor_name: String(parsed.vendor_name || '').replace(/\*\*/g, '').replace(/`/g, '').trim(),
    currency: extractCurrency(String(parsed.currency || '')),
    net_amount: parseAmount(parsed.net_amount as string | number),
    vat_amount: parseAmount(parsed.vat_amount as string | number),
    total_amount: parseAmount(parsed.total_amount as string | number),
  };
}

/**
 * Compare two invoices for consensus (key fields must match)
 */
function invoicesMatch(a: IInvoice, b: IInvoice): boolean {
  const numMatch = a.invoice_number.toLowerCase() === b.invoice_number.toLowerCase();
  const dateMatch = a.invoice_date === b.invoice_date;
  const totalMatch = Math.abs(a.total_amount - b.total_amount) < 0.02;
  return numMatch && dateMatch && totalMatch;
}

/**
 * Extract invoice data using consensus approach:
 * 1. Pass 1: Fast JSON extraction
 * 2. Pass 2: Confirm with thinking enabled
 * 3. If mismatch: repeat until consensus or max 5 attempts
 */
async function extractInvoiceFromImages(images: string[]): Promise<IInvoice> {
  console.log(`    [Vision] Processing ${images.length} page(s) with ${MODEL} (consensus)`);

  const MAX_ATTEMPTS = 5;
  let attempt = 0;

  while (attempt < MAX_ATTEMPTS) {
    attempt++;
    console.log(`    [Attempt ${attempt}/${MAX_ATTEMPTS}]`);

    // PASS 1: Fast JSON extraction
    console.log(`    [Pass 1] Fast extraction...`);
    const fastResponse = await queryJsonFast(images);
    const fastInvoice = parseJsonToInvoice(fastResponse);

    if (!fastInvoice) {
      console.log(`    [Pass 1] JSON parsing failed, retrying...`);
      continue;
    }
    console.log(`    [Pass 1] Result: ${fastInvoice.invoice_number} | ${fastInvoice.invoice_date} | ${fastInvoice.total_amount} ${fastInvoice.currency}`);

    // PASS 2: Confirm with thinking
    console.log(`    [Pass 2] Thinking confirmation...`);
    const thinkResponse = await queryJsonWithThinking(images);
    const thinkInvoice = parseJsonToInvoice(thinkResponse);

    if (!thinkInvoice) {
      console.log(`    [Pass 2] JSON parsing failed, retrying...`);
      continue;
    }
    console.log(`    [Pass 2] Result: ${thinkInvoice.invoice_number} | ${thinkInvoice.invoice_date} | ${thinkInvoice.total_amount} ${thinkInvoice.currency}`);

    // Check consensus
    if (invoicesMatch(fastInvoice, thinkInvoice)) {
      console.log(`    [Consensus] MATCH - using result`);
      return thinkInvoice; // Prefer thinking result
    }

    console.log(`    [Consensus] MISMATCH - repeating...`);
    console.log(`      Fast:  ${fastInvoice.invoice_number} | ${fastInvoice.invoice_date} | ${fastInvoice.total_amount}`);
    console.log(`      Think: ${thinkInvoice.invoice_number} | ${thinkInvoice.invoice_date} | ${thinkInvoice.total_amount}`);
  }

  // Max attempts reached - do one final thinking pass and use that
  console.log(`    [Final] Max attempts reached, using final thinking pass`);
  const finalResponse = await queryJsonWithThinking(images);
  const finalInvoice = parseJsonToInvoice(finalResponse);

  if (finalInvoice) {
    console.log(`    [Final] Result: ${finalInvoice.invoice_number} | ${finalInvoice.invoice_date} | ${finalInvoice.total_amount} ${finalInvoice.currency}`);
    return finalInvoice;
  }

  // Return empty invoice if all else fails
  console.log(`    [Final] All parsing failed, returning empty`);
  return {
    invoice_number: '',
    invoice_date: '',
    vendor_name: '',
    currency: 'EUR',
    net_amount: 0,
    vat_amount: 0,
    total_amount: 0,
  };
}

/**
 * Normalize date to YYYY-MM-DD
 */
function normalizeDate(dateStr: string | null): string {
  if (!dateStr) return '';
  if (/^\d{4}-\d{2}-\d{2}$/.test(dateStr)) return dateStr;

  const monthMap: Record<string, string> = {
    JAN: '01', FEB: '02', MAR: '03', APR: '04', MAY: '05', JUN: '06',
    JUL: '07', AUG: '08', SEP: '09', OCT: '10', NOV: '11', DEC: '12',
  };

  let match = dateStr.match(/^(\d{1,2})-([A-Z]{3})-(\d{4})$/i);
  if (match) {
    return `${match[3]}-${monthMap[match[2].toUpperCase()] || '01'}-${match[1].padStart(2, '0')}`;
  }

  match = dateStr.match(/^(\d{1,2})[\/.](\d{1,2})[\/.](\d{4})$/);
  if (match) {
    return `${match[3]}-${match[2].padStart(2, '0')}-${match[1].padStart(2, '0')}`;
  }

  return dateStr;
}

/**
 * Compare extracted invoice against expected
 */
function compareInvoice(
  extracted: IInvoice,
  expected: IInvoice
): { match: boolean; errors: string[] } {
  const errors: string[] = [];

  // Compare invoice number (normalize by removing spaces and case)
  const extNum = extracted.invoice_number?.replace(/\s/g, '').toLowerCase() || '';
  const expNum = expected.invoice_number?.replace(/\s/g, '').toLowerCase() || '';
  if (extNum !== expNum) {
    errors.push(`invoice_number: expected "${expected.invoice_number}", got "${extracted.invoice_number}"`);
  }

  // Compare date
  if (normalizeDate(extracted.invoice_date) !== normalizeDate(expected.invoice_date)) {
    errors.push(`invoice_date: expected "${expected.invoice_date}", got "${extracted.invoice_date}"`);
  }

  // Compare total amount (with tolerance)
  if (Math.abs(extracted.total_amount - expected.total_amount) > 0.02) {
    errors.push(`total_amount: expected ${expected.total_amount}, got ${extracted.total_amount}`);
  }

  // Compare currency
  if (extracted.currency?.toUpperCase() !== expected.currency?.toUpperCase()) {
    errors.push(`currency: expected "${expected.currency}", got "${extracted.currency}"`);
  }

  return { match: errors.length === 0, errors };
}

/**
 * Find all test cases (PDF + JSON pairs) in .nogit/invoices/
 */
function findTestCases(): Array<{ name: string; pdfPath: string; jsonPath: string }> {
  const testDir = path.join(process.cwd(), '.nogit/invoices');
  if (!fs.existsSync(testDir)) {
    return [];
  }

  const files = fs.readdirSync(testDir);
  const pdfFiles = files.filter((f) => f.endsWith('.pdf'));
  const testCases: Array<{ name: string; pdfPath: string; jsonPath: string }> = [];

  for (const pdf of pdfFiles) {
    const baseName = pdf.replace('.pdf', '');
    const jsonFile = `${baseName}.json`;
    if (files.includes(jsonFile)) {
      testCases.push({
        name: baseName,
        pdfPath: path.join(testDir, pdf),
        jsonPath: path.join(testDir, jsonFile),
      });
    }
  }

  testCases.sort((a, b) => a.name.localeCompare(b.name));
  return testCases;
}

// Tests

tap.test('setup: ensure Docker containers are running', async () => {
  console.log('\n[Setup] Checking Docker containers...\n');
  const minicpmOk = await ensureMiniCpm();
  expect(minicpmOk).toBeTrue();
  console.log('\n[Setup] All containers ready!\n');
});

tap.test('should have MiniCPM-V model loaded', async () => {
  const response = await fetch(`${OLLAMA_URL}/api/tags`);
  const data = await response.json();
  const modelNames = data.models.map((m: { name: string }) => m.name);
  expect(modelNames.some((name: string) => name.includes('minicpm'))).toBeTrue();
});

const testCases = findTestCases();
console.log(`\nFound ${testCases.length} invoice test cases (MiniCPM-V)\n`);

let passedCount = 0;
let failedCount = 0;
const processingTimes: number[] = [];

for (const testCase of testCases) {
  tap.test(`should extract invoice: ${testCase.name}`, async () => {
    const expected: IInvoice = JSON.parse(fs.readFileSync(testCase.jsonPath, 'utf-8'));
    console.log(`\n=== ${testCase.name} ===`);
    console.log(`Expected: ${expected.invoice_number} | ${expected.invoice_date} | ${expected.total_amount} ${expected.currency}`);

    const startTime = Date.now();
    const images = convertPdfToImages(testCase.pdfPath);
    console.log(`  Pages: ${images.length}`);

    const extracted = await extractInvoiceFromImages(images);
    console.log(`  Extracted: ${extracted.invoice_number} | ${extracted.invoice_date} | ${extracted.total_amount} ${extracted.currency}`);

    const elapsedMs = Date.now() - startTime;
    processingTimes.push(elapsedMs);

    const result = compareInvoice(extracted, expected);

    if (result.match) {
      passedCount++;
      console.log(`  Result: MATCH (${(elapsedMs / 1000).toFixed(1)}s)`);
    } else {
      failedCount++;
      console.log(`  Result: MISMATCH (${(elapsedMs / 1000).toFixed(1)}s)`);
      result.errors.forEach((e) => console.log(`    - ${e}`));
    }

    expect(result.match).toBeTrue();
  });
}

tap.test('summary', async () => {
  const totalInvoices = testCases.length;
  const accuracy = totalInvoices > 0 ? (passedCount / totalInvoices) * 100 : 0;
  const totalTimeMs = processingTimes.reduce((a, b) => a + b, 0);
  const avgTimeSec = processingTimes.length > 0 ? totalTimeMs / processingTimes.length / 1000 : 0;

  console.log(`\n========================================`);
  console.log(`   Invoice Extraction Summary (${MODEL})`);
  console.log(`========================================`);
  console.log(`  Method:    Consensus (fast + thinking)`);
  console.log(`  Passed:    ${passedCount}/${totalInvoices}`);
  console.log(`  Failed:    ${failedCount}/${totalInvoices}`);
  console.log(`  Accuracy:  ${accuracy.toFixed(1)}%`);
  console.log(`----------------------------------------`);
  console.log(`  Total time:   ${(totalTimeMs / 1000).toFixed(1)}s`);
  console.log(`  Avg per inv:  ${avgTimeSec.toFixed(1)}s`);
  console.log(`========================================\n`);
});

export default tap.start();