/**
 * Invoice extraction test using MiniCPM-V only (visual extraction)
 *
 * Multi-query approach with thinking DISABLED for speed.
 * Single pass, no consensus voting.
 */
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 = 'minicpm-v:latest';

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 200 -quality 90 "${pdfPath}" -background white -alpha remove "${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 });
  }
}

/**
 * Query MiniCPM-V for a single field (thinking disabled for speed)
 */
async function queryField(images: string[], question: string): Promise<string> {
  const response = await fetch(`${OLLAMA_URL}/api/generate`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      model: MODEL,
      prompt: `/no_think\n${question}`,
      images: images,
      stream: false,
      options: {
        num_predict: 500,
        temperature: 0.1,
      },
    }),
  });

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

  const data = await response.json();
  const content = (data.response || '').trim();

  // Return full content (no thinking to filter)
  return content;
}

/**
 * Extract invoice data using multiple queries with validation
 */
async function extractInvoiceFromImages(images: string[]): Promise<IInvoice> {
  console.log(`    [Vision] Processing ${images.length} page(s) with MiniCPM-V (multi-query + validation)`);

  // Log each result as it comes in
  const queryAndLog = async (name: string, question: string): Promise<string> => {
    const result = await queryField(images, question);
    console.log(`    [Query] ${name}: "${result}"`);
    return result;
  };

  // STRATEGY 1: List-then-pick for invoice number (avoids confusion with VAT/customer IDs)
  // Also ask for invoice number directly as backup
  const [allNumbers, directInvoiceNum] = await Promise.all([
    queryAndLog('All Numbers   ', `List ALL document numbers visible on this invoice.
For each number, identify what type it is.
Format: type:number, type:number
Example: >>>invoice:R0014359508, vat:DE123456789, customer:K001234<<<`),
    queryAndLog('Invoice # Dir ', `What is the INVOICE NUMBER (Rechnungsnummer)?
NOT the VAT number (starts with DE/IE), NOT customer ID.
Look for "Invoice No.", "Rechnungsnr.", "Invoice #", or "Facture".
For Adobe: starts with IEE or R followed by digits.
Return ONLY the number: >>>IEE2022006460244<<<`),
  ]);

  // STRATEGY 2: Query each field with >>> <<< delimiters
  const [invoiceDate, invoiceDateAlt, vendor, currency, totalAmount, netAmount, vatAmount] = await Promise.all([
    queryAndLog('Invoice Date  ', `Find the INVOICE DATE (when issued, NOT due date).
Look for: "Invoice Date", "Rechnungsdatum", "Date", "Datum"
Return ONLY the date in YYYY-MM-DD format: >>>2024-01-15<<<`),

    // STRATEGY 3: Ask same question differently for verification
    queryAndLog('Date Alt      ', `What date appears next to the invoice number at the top?
Return ONLY YYYY-MM-DD format: >>>2024-01-15<<<`),

    queryAndLog('Vendor        ', `What company ISSUED this invoice (seller, not buyer)?
Look at letterhead/logo at top.
Return ONLY the company name: >>>Adobe Inc.<<<`),

    queryAndLog('Currency      ', `What currency symbol appears next to amounts? € $ or £?
Return the 3-letter code: >>>EUR<<<`),

    queryAndLog('Total Amount  ', `What is the FINAL TOTAL amount (including tax) the customer must pay?
Look for "Total", "Grand Total", "Gesamtbetrag" at the bottom.
Return ONLY the number (no symbol): >>>24.99<<<`),

    queryAndLog('Net Amount    ', `What is the NET/subtotal amount BEFORE tax?
Look for "Net", "Netto", "Subtotal".
Return ONLY the number: >>>20.99<<<`),

    queryAndLog('VAT Amount    ', `What is the VAT/tax amount?
Look for "VAT", "MwSt", "USt", "Tax".
Return ONLY the number: >>>4.00<<<`),
  ]);

  // Extract value from >>> <<< delimiters, or return original if not found
  const extractDelimited = (s: string): string => {
    const match = s.match(/>>>([^<]+)<<</);
    return match ? match[1].trim() : s.trim();
  };

  // Parse amount from string (handles European format and prose)
  const parseAmount = (s: string): number => {
    if (!s) return 0;

    // First try delimited format
    const delimitedMatch = s.match(/>>>([^<]+)<<</);
    if (delimitedMatch) {
      const numMatch = delimitedMatch[1].match(/([\d.,]+)/);
      if (numMatch) {
        const numStr = numMatch[1];
        const normalized = numStr.includes(',') && numStr.indexOf(',') > numStr.lastIndexOf('.')
          ? numStr.replace(/\./g, '').replace(',', '.')
          : numStr.replace(/,/g, '');
        return parseFloat(normalized) || 0;
      }
    }

    // Try to find amount patterns in prose: "24.99", "24,99", "€24.99", "24.99 EUR"
    const amountPatterns = [
      /(?:€|EUR|USD|GBP)\s*([\d.,]+)/i,           // €24.99 or EUR 24.99
      /([\d.,]+)\s*(?:€|EUR|USD|GBP)/i,           // 24.99 EUR or 24.99€
      /(?:is|amount|total)[:\s]+([\d.,]+)/i,      // "is 24.99" or "amount: 24.99"
      /\b(\d{1,3}(?:[.,]\d{2,3})*(?:[.,]\d{2}))\b/, // General number pattern with decimals
    ];

    for (const pattern of amountPatterns) {
      const match = s.match(pattern);
      if (match) {
        const numStr = match[1];
        // European format: 1.234,56 → 1234.56
        const normalized = numStr.includes(',') && numStr.indexOf(',') > numStr.lastIndexOf('.')
          ? numStr.replace(/\./g, '').replace(',', '.')
          : numStr.replace(/,/g, '');
        const value = parseFloat(normalized);
        if (value > 0) return value;
      }
    }

    return 0;
  };

  // STRATEGY 1: Parse "all numbers" to find invoice number
  const extractInvoiceFromList = (allNums: string): string | null => {
    const delimited = extractDelimited(allNums);

    // Find ALL "invoice:XXX" matches
    const invoiceMatches = delimited.matchAll(/invoice[:\s]*([A-Z0-9-]+)/gi);
    const candidates: string[] = [];
    for (const match of invoiceMatches) {
      const value = match[1];
      // Filter out labels like "USt-IdNr", "INVOICE", short strings
      if (value.length > 5 && /\d{4,}/.test(value) && !/^(ust|vat|tax|nr|id|no)/i.test(value)) {
        candidates.push(value);
      }
    }
    if (candidates.length > 0) return candidates[0];

    // Look for "rechnungsnr:XXX" pattern
    const rechnungMatch = delimited.match(/rechnung[snr]*[:\s]*([A-Z0-9-]{6,})/i);
    if (rechnungMatch && /\d{4,}/.test(rechnungMatch[1])) return rechnungMatch[1];

    // Look for patterns like IEE2022..., R001... (Adobe invoice number patterns)
    const adobeMatch = delimited.match(/\b(IEE\d{10,})\b/i);
    if (adobeMatch) return adobeMatch[1];
    const rInvoiceMatch = delimited.match(/\b(R\d{8,})\b/i);
    if (rInvoiceMatch) return rInvoiceMatch[1];

    return null;
  };

  // Fallback invoice number extraction
  const extractInvoiceNumber = (s: string): string => {
    const delimited = extractDelimited(s);
    if (delimited !== s.trim()) return delimited;

    let clean = s.replace(/\*\*/g, '').replace(/`/g, '');
    const patterns = [
      /\b([A-Z]{2,3}\d{10,})\b/i,
      /\b([A-Z]\d{8,})\b/i,
      /\b(INV[-\s]?\d{4}[-\s]?\d+)\b/i,
      /\b(\d{7,})\b/,
    ];
    for (const pattern of patterns) {
      const match = clean.match(pattern);
      if (match) return match[1];
    }
    return clean.replace(/[^A-Z0-9-]/gi, '').trim() || clean.trim();
  };

  // Extract date with fallback
  const extractDate = (s: string): string => {
    const delimited = extractDelimited(s);
    if (/^\d{4}-\d{2}-\d{2}$/.test(delimited)) return delimited;

    let clean = s.replace(/\*\*/g, '').replace(/`/g, '');
    const isoMatch = clean.match(/(\d{4}-\d{2}-\d{2})/);
    if (isoMatch) return isoMatch[1];
    const dmmyMatch = clean.match(/(\d{1,2})[-\/]([A-Z]{3})[-\/](\d{4})/i);
    if (dmmyMatch) {
      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',
      };
      return `${dmmyMatch[3]}-${monthMap[dmmyMatch[2].toUpperCase()] || '01'}-${dmmyMatch[1].padStart(2, '0')}`;
    }
    const dmyMatch = clean.match(/(\d{1,2})[\/.](\d{1,2})[\/.](\d{4})/);
    if (dmyMatch) {
      return `${dmyMatch[3]}-${dmyMatch[2].padStart(2, '0')}-${dmyMatch[1].padStart(2, '0')}`;
    }
    return '';
  };

  // Extract currency
  const extractCurrency = (s: string): string => {
    const delimited = extractDelimited(s);
    if (['EUR', 'USD', 'GBP'].includes(delimited.toUpperCase())) return delimited.toUpperCase();
    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 vendor
  const extractVendor = (s: string): string => {
    const delimited = extractDelimited(s);
    if (delimited !== s.trim()) return delimited;
    let clean = s.replace(/\*\*/g, '').replace(/`/g, '').trim();
    if (clean.length < 50) return clean.replace(/[."]+$/, '').trim();
    const companyMatch = clean.match(/([A-Z][A-Za-z0-9\s&]+(?:Ltd|Limited|GmbH|Inc|BV|AG|SE|LLC|Co|Corp)[.]?)/i);
    if (companyMatch) return companyMatch[1].trim();
    return clean;
  };

  // STRATEGY 1: Get invoice number - try multiple approaches
  // 1. From list with type labels
  // 2. From direct query
  // 3. From pattern matching
  const fromList = extractInvoiceFromList(allNumbers);
  const fromDirect = extractInvoiceNumber(directInvoiceNum);
  const fromFallback = extractInvoiceNumber(allNumbers);

  // Prefer direct query if it has digits, otherwise use list
  const invoiceNumber = (fromDirect && /\d{6,}/.test(fromDirect)) ? fromDirect :
                        (fromList && /\d{4,}/.test(fromList)) ? fromList :
                        fromDirect || fromList || fromFallback;
  console.log(`    [Parsed] Invoice Number: "${invoiceNumber}" (list: ${fromList}, direct: ${fromDirect})`);

  // STRATEGY 3: Compare two date responses, pick the valid one
  const date1 = extractDate(invoiceDate);
  const date2 = extractDate(invoiceDateAlt);
  const finalDate = date1 || date2;
  if (date1 && date2 && date1 !== date2) {
    console.log(`    [Validate] Date mismatch: "${date1}" vs "${date2}" - using first`);
  }

  // Parse amounts
  let total = parseAmount(totalAmount);
  let net = parseAmount(netAmount);
  let vat = parseAmount(vatAmount);

  // STRATEGY 4: Cross-field validation for amounts
  // If amounts seem wrong (e.g., 1690 instead of 1.69), try to fix
  if (total > 10000 && net < 100) {
    console.log(`    [Validate] Total ${total} seems too high vs net ${net}, dividing by 100`);
    total = total / 100;
  }
  if (net > 10000 && total < 100) {
    console.log(`    [Validate] Net ${net} seems too high vs total ${total}, dividing by 100`);
    net = net / 100;
  }

  // Check if Net + VAT ≈ Total
  if (net > 0 && vat >= 0 && total > 0) {
    const calculated = net + vat;
    if (Math.abs(calculated - total) > 1) {
      console.log(`    [Validate] Math check: ${net} + ${vat} = ${calculated} ≠ ${total}`);
    }
  }

  return {
    invoice_number: invoiceNumber,
    invoice_date: finalDate,
    vendor_name: extractVendor(vendor),
    currency: extractCurrency(currency),
    net_amount: net,
    vat_amount: vat,
    total_amount: total,
  };
}

/**
 * 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 (MiniCPM)`);
  console.log(`========================================`);
  console.log(`  Method:    Multi-query (no_think)`);
  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();