const { getStoreLocation } = require('../services/siw');
const { findMerakiNetwork, getMerakiDeviceAvailabilities, getMerakiClients } = require('../services/meraki');
const { getMDMDevices } = require('../services/mdm');

async function getStoreHealth(storeNumber) {
    console.log(`🔍 Running health analysis for store ${storeNumber}`);

    let locationData, merakiNetwork, merakiClients = [], mdmDevices = [], paymentTerminals = [], printers = [];

    try {
        [locationData, merakiNetwork] = await Promise.all([
            getStoreLocation(storeNumber),
            findMerakiNetwork(storeNumber)
        ]);

        if (merakiNetwork) {
            [merakiClients, mdmDevices, paymentTerminals, printers] = await Promise.all([
                getMerakiClients(merakiNetwork.id),
                getMDMDevices(storeNumber),
                require('../services/siw').getStorePaymentTerminals(storeNumber),
                require('../services/siw').getStorePrinters(storeNumber)
            ]);
        }
    } catch (err) {
        console.error('❌ Health analysis error:', err.message);
    }

    let summary = `**📊 Store ${storeNumber} Health Summary - ${locationData?.name || 'Unknown Store'}**\n\n`;
    let overallScore = 100;
    const issues = [];

        // === Network Infrastructure ===
    summary += `**🌐 Network Infrastructure**\n`;
    if (merakiNetwork) {
        summary += `- Meraki Network: ✅ [${merakiNetwork.name}](${merakiNetwork.url})\n`;

        try {
            const avail = await getMerakiDeviceAvailabilities(merakiNetwork.id);
            const switches = avail.filter(d => d.productType === 'switch' && d.status !== 'dormant');
            const aps = avail.filter(d => d.productType === 'wireless' && d.status !== 'dormant');

            const swOnline = switches.filter(d => d.status === 'online').length;
            const apOnline = aps.filter(d => d.status === 'online').length;
            const apAlerting = aps.filter(d => d.status === 'alerting').length;

            summary += `- Switching: ${swOnline}/${switches.length} online\n`;
            summary += `- Access Points: ${apOnline}/${aps.length} online`;

            if (apAlerting > 0) {
                summary += ` (${apAlerting} alerting)`;
            }
            summary += `\n\n`;

            // Scoring & Issues
            if (swOnline < switches.length) {
                const offlineSw = switches.length - swOnline;
                overallScore -= offlineSw * 15;
                issues.push(`${offlineSw} switch(es) offline`);
            }

            if (apOnline < aps.length || apAlerting > 0) {
                const totalApIssues = aps.length - apOnline;
                
                
                if (apAlerting > 0) {
                    overallScore -= totalApIssues * 3;
                    issues.push(`${apAlerting} access point(s) alerting (check cabling/power)`);
                } else {
                    overallScore -= totalApIssues * 5;
                    issues.push(`${totalApIssues} access point(s) offline`);
                }
            }
        } catch (e) {
            console.error('Meraki availability error:', e.message);
        }
    } else {
        summary += `- Meraki Network: ❌ Not Found\n\n`;
        overallScore -= 50;
        issues.push("No Meraki network found");
    }

    // === Core Systems ===
    summary += `**🖥️ POS Systems**\n`;

    if (mdmDevices && mdmDevices.length > 0) {
        const servers = mdmDevices.filter(d => (d.UserName || d.DeviceFriendlyName || '').includes('SRV'));
        const mobileRegs = mdmDevices.filter(d => (d.UserName || d.DeviceFriendlyName || '').includes('MR'));
        const custDisplays = mdmDevices.filter(d => (d.UserName || d.DeviceFriendlyName || '').includes('CD'));
        const iphones = mdmDevices.filter(d => (d.UserName || d.DeviceFriendlyName || '').includes('IPH'));

        // Server (heavy penalty)
        let serverStatus = '❓ Unknown';
        if (servers.length > 0) {
            const match = merakiClients.find(c => 
                c?.description && servers.some(s => 
                    (s.UserName || s.DeviceFriendlyName || '').toLowerCase().includes((c.description || '').toLowerCase())
                )
            );
            serverStatus = match && match.status === 'Online' ? '✅ Online' : '❌ Offline';
            if (serverStatus === '❌ Offline') {
                overallScore -= 35;
                issues.push(`Store Server ${servers[0]?.UserName} is offline`);
            }
        }
        summary += `- Store Server: ${serverStatus}\n`;

        // Mobile Registers
        let mobileOnline = 0;
        mobileRegs.forEach(reg => {
            const name = (reg.UserName || reg.DeviceFriendlyName || '').trim();
            const match = merakiClients.find(c => 
                c?.description && c.description.toLowerCase().includes(name.toLowerCase()) ||
                (c.user && c.user.toLowerCase().includes(name.toLowerCase()))
            );
            const status = match && match.status === 'Online' ? '✅ Online' : '❌ Offline';
            if (status === '✅ Online') mobileOnline++;
            if (status === '❌ Offline') issues.push(`Mobile Register ${name} is offline`);
        });
        summary += `- Mobile Registers: ${mobileOnline}/${mobileRegs.length} online\n`;

        // Customer Displays & iPhones (lighter penalty)
        let cdOnline = 0;
        custDisplays.forEach(cd => {
            const name = (cd.UserName || cd.DeviceFriendlyName || '').trim();
            const match = merakiClients.find(c => 
                c?.description && c.description.toLowerCase().includes(name.toLowerCase()) ||
                (c.user && c.user.toLowerCase().includes(name.toLowerCase()))
            );
            if (match && match.status === 'Online') cdOnline++;
            if (match && match.status !== 'Online') issues.push(`Customer Display ${name} is offline`);
        });
        summary += `- Customer Displays: ${cdOnline}/${custDisplays.length} online\n`;

        let iphoneOnline = 0;
        iphones.forEach(phone => {
            const name = (phone.UserName || phone.DeviceFriendlyName || '').trim();
            const match = merakiClients.find(c => 
                c?.description && c.description.toLowerCase().includes(name.toLowerCase()) ||
                (c.user && c.user.toLowerCase().includes(name.toLowerCase()))
            );
            if (match && match.status === 'Online') iphoneOnline++;
            if (match && match.status !== 'Online') issues.push(`iPhone ${name} is offline`);
        });
        summary += `- Store iPhones: ${iphoneOnline}/${iphones.length} online\n\n`;
    } else {
        summary += `- No MDM data available\n\n`;
        overallScore -= 20;
    }

    // === POS & Peripherals (with per-device penalty) ===
    summary += `**💳 POS Peripherals**\n`;

    // Payment Terminals
    if (paymentTerminals && paymentTerminals.length > 0) {
        let onlinePayments = 0;
        paymentTerminals.forEach(term => {
            const name = (term.device_name || term.adyen_device_name || '').trim().toLowerCase();
            const cleanIp = (term.ip_address || '').split('.')[0].toLowerCase();

            const match = merakiClients.find(c => 
                c?.description && (
                    c.description.toLowerCase().includes(name) || 
                    c.description.toLowerCase().includes(cleanIp)
                )
            );

            const status = match && match.status === 'Online' ? '✅ Online' : '❌ Offline';
            if (status === '✅ Online') onlinePayments++;
            if (status === '❌ Offline') {
                overallScore -= 5;   // penalty per offline terminal
                issues.push(`Payment Terminal ${name} is offline`);
            }
        });

        summary += `- Payment Terminals: ${onlinePayments}/${paymentTerminals.length} online\n`;
    }

    // Printers
    const filteredPrinters = (printers || []).filter(p => 
        (p.connection_type_name || '').toLowerCase() !== 'usb'
    );

    if (filteredPrinters.length > 0) {
        let onlinePrinters = 0;
        filteredPrinters.forEach(printer => {
            const name = (printer.printer_name || '').trim().toLowerCase();
            const match = merakiClients.find(c => 
                c?.description && c.description.toLowerCase().includes(name)
            );
            const status = match && match.status === 'Online' ? '✅ Online' : '❌ Offline';
            if (status === '✅ Online') onlinePrinters++;
            if (status === '❌ Offline') {
                overallScore -= 4;   // penalty per offline printer
                issues.push(`Printer ${name} is offline`);
            }
        });

        summary += `- Printers: ${onlinePrinters}/${filteredPrinters.length} online\n`;
    }

    // === Overall Status ===
    overallScore = Math.max(0, Math.round(overallScore));

    let statusEmoji = overallScore >= 90 ? '🟢' : overallScore >= 70 ? '🟡' : '🔴';
    let statusText = overallScore >= 90 ? 'Good' : overallScore >= 70 ? 'Fair' : 'Needs Attention';

    summary += `\n**Overall Status**: ${statusEmoji} ${statusText} (${overallScore}% healthy)\n\n`;

    if (issues.length > 0) {
        summary += `**⚠️ Issues Detected**\n`;
        issues.forEach(issue => summary += `- ${issue}\n`);
    } else {
        summary += `**✅ No major issues detected**\n`;
    }

    return { summary };
}

module.exports = { getStoreHealth };