// BullMQ Worker: Content Generator
import { Worker } from 'bullmq';
import { pool } from '../lib/db';
import { redisConnection } from '../lib/queue/config';
import { SpintaxResolver, expandVariables, generateCartesianProduct } from '../lib/spintax/resolver';
import crypto from 'crypto';

interface GenerateCampaignJob {
    campaignId: string;
    campaignName: string;
}

/**
 * Main content generation worker
 * Processes campaigns and generates full articles
 */
export const contentGeneratorWorker = new Worker(
    'generate_campaign_content',
    async (job) => {
        const { campaignId, campaignName } = job.data as GenerateCampaignJob;

        console.log(`\n🔱 Processing campaign: ${campaignName} (${campaignId})`);

        try {
            // 1. Fetch campaign blueprint
            const campaignResult = await pool.query(
                `SELECT id, blueprint_json, site_id FROM campaign_masters WHERE id = $1`,
                [campaignId]
            );

            if (campaignResult.rows.length === 0) {
                throw new Error(`Campaign ${campaignId} not found`);
            }

            const campaign = campaignResult.rows[0];
            const blueprint = campaign.blueprint_json;
            const siteId = campaign.site_id;

            console.log(`📋 Blueprint loaded: ${blueprint.asset_name}`);
            console.log(`🔢 Variables: ${Object.keys(blueprint.variables).join(', ')}`);

            // 2. Generate cartesian product of all variables
            const combinations = generateCartesianProduct(blueprint.variables);
            console.log(`🎯 Generated ${combinations.length} unique combinations`);

            let created = 0;
            let skipped = 0;

            // 3. For each combination, generate article
            for (const vars of combinations) {
                try {
                    const articleHtml = await generateArticle(blueprint, vars, campaignId, siteId);

                    if (articleHtml) {
                        created++;
                        console.log(`✅ Created: ${vars.CITY}, ${vars.STATE} (${created}/${combinations.length})`);
                    } else {
                        skipped++;
                    }
                } catch (err) {
                    console.error(`❌ Failed for ${vars.CITY}:`, err);
                    skipped++;
                }

                // Update progress
                await job.updateProgress((created + skipped) / combinations.length * 100);
            }

            // 4. Mark campaign complete
            await pool.query(
                `UPDATE campaign_masters SET status = 'completed', updated_at = NOW() WHERE id = $1`,
                [campaignId]
            );

            console.log(`\n🎉 Campaign complete! Created: ${created}, Skipped: ${skipped}\n`);

            return { created, skipped, total: combinations.length };

        } catch (error) {
            console.error(`💥 Campaign processing failed:`, error);

            await pool.query(
                `UPDATE campaign_masters SET status = 'failed', updated_at = NOW() WHERE id = $1`,
                [campaignId]
            );

            throw error;
        }
    },
    {
        connection: redisConnection,
        concurrency: 2
    }
);

/**
 * Generate a single article from blueprint + variables
 */
async function generateArticle(
    blueprint: any,
    vars: Record<string, string>,
    campaignId: string,
    siteId: string
): Promise<string | null> {

    // Create unique seed for this variation
    const seed = JSON.stringify(vars);
    const resolver = new SpintaxResolver(seed);

    // 1. Expand variable placeholders
    let fullHtml = '';
    const blocks = blueprint.content.body;

    for (const block of blocks) {
        let blockContent = block.content;

        // Replace {{VARIABLES}}
        blockContent = expandVariables(blockContent, vars);

        // Resolve spintax {A|B|C}
        blockContent = resolver.resolve(blockContent);

        fullHtml += blockContent + '\n\n';
    }

    // 2. Generate variation hash for uniqueness check
    const variationHash = resolver.getChoicesHash();
    const varsHash = crypto.createHash('sha256')
        .update(JSON.stringify(vars))
        .digest('hex')
        .substring(0, 32);
    const combinedHash = crypto.createHash('sha256')
        .update(variationHash + varsHash)
        .digest('hex')
        .substring(0, 64);

    // 3. Check if this variation already exists
    const existingCheck = await pool.query(
        `SELECT id FROM variation_registry WHERE variation_hash = $1`,
        [combinedHash]
    );

    if (existingCheck.rows.length > 0) {
        console.log(`⏭️  Skipping duplicate: ${vars.CITY}`);
        return null;
    }

    // 4. Generate title and slug
    const title = expandVariables(resolver.resolve(blueprint.asset_name), vars);
    const slug = generateSlug(vars);

    // 5. Generate meta description
    const metaDesc = expandVariables(
        resolver.resolve(blueprint.meta_description),
        vars
    );

    // 6. Insert post
    const postResult = await pool.query(
        `INSERT INTO posts (
      site_id, title, slug, content, excerpt, status, 
      published_at, created_at
    ) VALUES ($1, $2, $3, $4, $5, 'published', NOW(), NOW())
    RETURNING id`,
        [
            siteId,
            title,
            slug,
            fullHtml,
            metaDesc.substring(0, 300)
        ]
    );

    const postId = postResult.rows[0].id;

    // 7. Record the variation
    await pool.query(
        `INSERT INTO variation_registry (
      campaign_id, variation_hash, resolved_variables, spintax_choices, post_id
    ) VALUES ($1, $2, $3, $4, $5)`,
        [
            campaignId,
            combinedHash,
            JSON.stringify(vars),
            JSON.stringify(resolver.getChoices()),
            postId
        ]
    );

    // 8. Update block usage stats
    await updateBlockUsageStats(blocks, resolver.getChoices());

    return fullHtml;
}

/**
 * Update usage statistics for blocks and spintax choices
 */
async function updateBlockUsageStats(blocks: any[], choices: any[]) {
    // Track which blocks were used
    for (const block of blocks) {
        await pool.query(
            `INSERT INTO block_usage_stats (content_fragment_id, block_type, total_uses, last_used_at)
       SELECT id, $1, 1, NOW()
       FROM content_fragments
       WHERE block_type = $1
       ON CONFLICT (content_fragment_id) DO UPDATE SET
         total_uses = block_usage_stats.total_uses + 1,
         last_used_at = NOW()`,
            [block.block_type.replace(/ \(\d+\)$/, '')]
        );
    }

    // Track spintax variation usage
    for (const choice of choices) {
        await pool.query(
            `INSERT INTO spintax_variation_stats (
        content_fragment_id, variation_path, variation_text, use_count, last_used_at
      )
      SELECT cf.id, $1, $2, 1, NOW()
      FROM content_fragments cf
      LIMIT 1
      ON CONFLICT DO NOTHING`,
            [choice.path, choice.chosen]
        );
    }
}

/**
 * Generate URL-safe slug from variables
 */
function generateSlug(vars: Record<string, string>): string {
    const city = (vars.CITY || 'city').toLowerCase().replace(/[^a-z0-9]+/g, '-');
    const state = (vars.STATE || 'state').toLowerCase().replace(/[^a-z0-9]+/g, '-');
    return `${city}-${state}-${Date.now()}`;
}

// Worker event handlers
contentGeneratorWorker.on('completed', (job) => {
    console.log(`✅ Job ${job.id} completed:`, job.returnvalue);
});

contentGeneratorWorker.on('failed', (job, err) => {
    console.error(`❌ Job ${job?.id} failed:`, err);
});

contentGeneratorWorker.on('error', (err) => {
    console.error('💥 Worker error:', err);
});

console.log('🚀 Content Generator Worker started');