import { pool } from '../db.js';
import crypto from 'crypto';

// Job templates for variety
// Job templates for variety (Funny & Serious mix)
const jobTemplates = [
    // Tech Roles
    { title: 'Senior Stack Overflow Copy-Paster', skills: ['Ctrl+C', 'Ctrl+V', 'Google Fu'], salaryRange: [120000, 180000] }, // High salary
    { title: 'Full Stack Overflow Engineer', skills: ['JavaScript', 'Python', 'Chaos Engineering'], salaryRange: [90000, 150000] },
    { title: 'Frontend Div Centerer', skills: ['CSS', 'Flexbox', 'Patience'], salaryRange: [70000, 120000] },
    { title: 'Backend JSON Mover', skills: ['Node.js', 'Go', 'REST'], salaryRange: [85000, 140000] },
    { title: 'Kubernetes YAML Herder', skills: ['Docker', 'K8s', 'Indentations'], salaryRange: [130000, 200000] },
    { title: 'AI Prompt Whisperer', skills: ['ChatGPT', 'English', 'Imagination'], salaryRange: [60000, 300000] }, // Volatile salary
    { title: 'Legacy Code Archaeologist', skills: ['COBOL', 'Fortran', 'Dusting'], salaryRange: [150000, 250000] },

    // Management & Product
    { title: 'Chief Meeting Scheduler', skills: ['Calendar', 'Zoom', 'Talking'], salaryRange: [100000, 160000] },
    { title: 'Scrum Master of Puppets', skills: ['Jira', 'Whips', 'Post-its'], salaryRange: [90000, 140000] },
    { title: 'Product Visionary (Dreamer)', skills: ['Keynote', 'Buzzwords', 'Optimism'], salaryRange: [110000, 190000] },

    // Design
    { title: 'Pixel Perfect Pedant', skills: ['Figma', 'Zoom 800%', 'Eye Drops'], salaryRange: [80000, 130000] },
    { title: 'UX Dark Pattern Architect', skills: ['Psychology', 'Manipulation', 'CSS'], salaryRange: [95000, 155000] },

    // Financial (The "Banco Desaster" influence)
    { title: 'Creative Accountant', skills: ['Excel', 'Creativity', 'Obfuscation'], salaryRange: [100000, 500000] },
    { title: 'High-Frequency Front-Runner', skills: ['C++', 'Low Latency', 'Moral Flexibility'], salaryRange: [200000, 800000] },
    { title: 'Offshore Database Admin', skills: ['SQL', 'Boat Driving', 'Secrecy'], salaryRange: [120000, 180000] },
    { title: 'Risk Ignoring Manager', skills: ['Coin Toss', 'Gut Feeling', 'Blindfolds'], salaryRange: [150000, 300000] }
];

const internationalLocations = [
    'New York, NY', 'San Francisco, CA', 'London, UK', 'Berlin, DE', 'Remote (Global)',
    'Silicon Valley, CA', 'Austin, TX', 'Amsterdam, NL', 'Tokyo, JP', 'Singapore, SG',
    'Dubai, UAE', 'Cayman Islands'
];

const workModes = ['onsite', 'hybrid', 'remote'];
const levels = ['Junior', 'Mid-Level', 'Senior', 'Lead'];
const benefits = [
    'Health Insurance', 'Dental Plan', 'Gym Membership', 'Stock Options',
    'Remote Work', 'Flexible Hours', 'Annual Bonus', 'Education Budget',
    'Meal Allowance', 'Transport Allowance', 'Home Office Setup', 'Wellness Program'
];

function getRandomItems(arr, count) {
    const shuffled = [...arr].sort(() => 0.5 - Math.random());
    return shuffled.slice(0, count);
}

function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

export async function seedJobs() {
    console.log('💼 Seeding jobs (25 per company)...');

    // Get company IDs from companies table (jobs.company_id references companies.id which is INT)
    const companiesRes = await pool.query('SELECT id, name FROM companies ORDER BY name');
    const companies = companiesRes.rows;

    if (companies.length === 0) {
        console.log('   ⚠️ No companies found. Please seed companies first.');
        return;
    }

    // Get a user from users table for created_by FK (INT)
    const seedUserRes = await pool.query("SELECT id FROM users LIMIT 1");
    if (seedUserRes.rows.length === 0) {
        console.log('   ⚠️ No users found. Creating a system user...');
        await pool.query(`
            INSERT INTO users (name, email, password_hash, role, status)
            VALUES ('System Seeder', 'system@gohorsejobs.com', '$2b$10$placeholder', 'admin', 'active')
            ON CONFLICT DO NOTHING
        `);
    }
    const userRes = await pool.query("SELECT id FROM users LIMIT 1");
    const seedUserId = userRes.rows[0]?.id;

    let totalJobs = 0;

    try {
        // Process companies in chunks to avoid overwhelming the DB
        for (const company of companies) {
            const jobValues = [];
            const jobParams = [];
            let paramCounter = 1;

            // Generate 25 jobs per company
            for (let i = 0; i < 25; i++) {
                const template = jobTemplates[i % jobTemplates.length];
                const level = levels[i % levels.length];
                const workMode = workModes[i % 3]; // Even distribution: onsite, hybrid, remote

                const title = i < 33 ? `${level} ${template.title}` : template.title;
                const salaryMin = template.salaryRange[0] + getRandomInt(-2000, 2000);
                const salaryMax = template.salaryRange[1] + getRandomInt(-2000, 3000);

                const employmentTypes = ['full-time', 'part-time', 'contract', 'permanent', 'temporary', 'training'];
                const currencies = ['BRL', 'BRL', 'BRL', 'BRL', 'BRL', 'BRL', 'BRL', 'USD', 'USD', 'EUR']; // 70% BRL, 20% USD, 10% EUR
                const salaryTypes = ['hourly', 'daily', 'weekly', 'monthly', 'yearly'];
                const employmentType = employmentTypes[i % employmentTypes.length];
                const currency = currencies[i % currencies.length];
                const salaryType = salaryTypes[i % salaryTypes.length];

                const workingHoursOptions = ['full-time', 'part-time', ''];
                const workingHours = workingHoursOptions[i % 3];
                const salaryNegotiable = i % 10 === 0; // 10% negotiable

                // Prepare params for bulk insert
                jobParams.push(
                    company.id,
                    seedUserId,
                    title,
                    `We are looking for a talented ${title} to join our ${company.name} team. Your role as ${level} will be crucial.`,
                    salaryNegotiable ? null : salaryMin, // If negotiable, min is null
                    salaryNegotiable ? null : salaryMax, // If negotiable, max is null
                    salaryType,
                    currency,
                    employmentType,
                    workingHours,
                    workMode === 'remote' ? 'Remote (Global)' : internationalLocations[i % internationalLocations.length],
                    JSON.stringify(template.skills),
                    JSON.stringify(getRandomItems(benefits, 4)),
                    i % 5 === 0, // 20% offer visa support
                    'beginner',
                    'open',
                    workMode,
                    salaryNegotiable
                );

                // ($1, $2, $3, ...), ($18, $19, ...)
                const placeHolders = [];
                for (let k = 0; k < 18; k++) {
                    placeHolders.push(`$${paramCounter++}`);
                }
                jobValues.push(`(${placeHolders.join(',')})`);

                totalJobs++;
            }

            // Bulk Insert for this company
            if (jobValues.length > 0) {
                const query = `
                    INSERT INTO jobs (company_id, created_by, title, description, 
                        salary_min, salary_max, salary_type, currency, employment_type, working_hours,
                        location, requirements, benefits, visa_support, language_level, status, work_mode, salary_negotiable)
                    VALUES ${jobValues.join(',')}
                `;
                await pool.query(query, jobParams);
            }
        }

        console.log(`   ✓ ${totalJobs} jobs seeded across ${companies.length} companies`);
        console.log(`   📊 Work mode distribution: ~33% onsite, ~33% hybrid, ~33% remote`);
    } catch (error) {
        console.error('   ❌ Error seeding jobs:', error.message);
        throw error;
    }
}