/**
 * Work Order Report Parser
 *
 * Parses the TXT work order status reports from TS-XX/Reports/ folders.
 *
 * Format:
 *   ===================================================================
 *   WO#: 179257
 *   Date:  03-27-2026
 *   Work order status file for work order #: 179257
 *   Program:   TEST8B1D.EXE
 *   Version:   B.19 2023.08.02 JL
 *   Lib. Ver.: B.09 2019.02.08 MR
 *   -------------------------------------------------------------------
 *   Status   Serial#   DS File Name  Model         Date        Time
 *   -------- --------- ------------  ------------- ----------  --------
 *   PASS     179257-1  H9257-1.TXT   8B47K-05      03-27-2026  10:25:56
 *   FAIL<<<< 179257-12               8B47K-05      03-27-2026  11:01:09
 *   ...
 */

const fs = require('fs');
const path = require('path');

/**
 * Extract test station from file path (e.g., C:\Shares\test\TS-4L\Reports\179257.TXT -> TS-4L)
 */
function extractStation(filePath) {
    const match = filePath.match(/[\\\/](TS-[^\\\/]+)[\\\/]/i);
    return match ? match[1].toUpperCase() : null;
}

/**
 * Extract work order number from filename (e.g., 179257.TXT -> 179257)
 */
function extractWoFromFilename(filePath) {
    const base = path.basename(filePath, path.extname(filePath));
    return base;
}

/**
 * Parse a work order report TXT file
 * @param {string} filePath - Path to the report file
 * @returns {object} Parsed work order with header and lines
 */
function parseWoReport(filePath) {
    const content = fs.readFileSync(filePath, 'utf8');
    const lines = content.split(/\r?\n/);

    const result = {
        wo_number: null,
        wo_date: null,
        program: null,
        version: null,
        lib_version: null,
        station: extractStation(filePath),
        source_file: filePath,
        lines: [],      // test result lines
        ds_files: [],   // datasheet files listed at bottom
    };

    let inHeader = true;
    let inDsList = false;

    for (const line of lines) {
        const t = line.trim();

        // Parse header fields
        const woMatch = t.match(/^WO#:\s*(\S+)/);
        if (woMatch) {
            result.wo_number = woMatch[1];
            continue;
        }

        const dateMatch = t.match(/^Date:\s*(\d{2}-\d{2}-\d{4})/);
        if (dateMatch) {
            const [month, day, year] = dateMatch[1].split('-');
            result.wo_date = `${year}-${month}-${day}`;
            continue;
        }

        const progMatch = t.match(/^Program:\s*(\S+)/);
        if (progMatch) {
            result.program = progMatch[1];
            continue;
        }

        const verMatch = t.match(/^Version:\s*(.+)/);
        if (verMatch) {
            result.version = verMatch[1].trim();
            continue;
        }

        const libMatch = t.match(/^Lib\. Ver\.:\s*(.+)/);
        if (libMatch) {
            result.lib_version = libMatch[1].trim();
            continue;
        }

        // Detect separator lines
        if (t.match(/^-{20,}$/)) {
            inHeader = false;
            continue;
        }

        // Skip header row
        if (t.startsWith('Status') && t.includes('Serial#')) continue;

        // Detect datasheet file list section
        if (t.includes('datasheet files actually created')) {
            inDsList = true;
            continue;
        }

        if (inDsList) {
            if (t.match(/^-+$/)) continue;
            if (t.match(/^\S+\.TXT$/i)) {
                result.ds_files.push(t);
            }
            continue;
        }

        // Parse test result lines
        // PASS     179257-1  H9257-1.TXT   8B47K-05      03-27-2026  10:25:56
        // FAIL<<<< 179257-12               8B47K-05      03-27-2026  11:01:09
        if (!inHeader && t.length > 0) {
            const passMatch = t.match(/^(PASS)\s+(\S+)\s+(\S+\.TXT)\s+(\S+)\s+(\d{2}-\d{2}-\d{4})\s+(\d{2}:\d{2}:\d{2})/i);
            const failMatch = t.match(/^(FAIL[<]*)\s+(\S+)\s+(\S+)\s+(\d{2}-\d{2}-\d{4})\s+(\d{2}:\d{2}:\d{2})/i);

            if (passMatch) {
                const [, status, serial, dsFile, model, date, time] = passMatch;
                const [month, day, year] = date.split('-');
                result.lines.push({
                    status: 'PASS',
                    serial_number: serial,
                    ds_filename: dsFile,
                    model_number: model,
                    test_date: `${year}-${month}-${day}`,
                    test_time: time,
                });
            } else if (failMatch) {
                const [, status, serial, model, date, time] = failMatch;
                const [month, day, year] = date.split('-');
                result.lines.push({
                    status: 'FAIL',
                    serial_number: serial,
                    ds_filename: null,
                    model_number: model,
                    test_date: `${year}-${month}-${day}`,
                    test_time: time,
                });
            }
        }
    }

    // Fall back to filename for WO# if not found in content
    if (!result.wo_number) {
        result.wo_number = extractWoFromFilename(filePath);
    }

    return result;
}

module.exports = { parseWoReport, extractStation, extractWoFromFilename };