// Cache-busting comment - Updated to fix ES6 syntax issues - v2.0
const fetchWithRetry = async (url, options, maxRetries = 3) => {
    for (let i = 0; i < maxRetries; i++) {
        try {
            const response = await fetch(url, options);
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }
            const text = await response.text();
            if (!text) {
                throw new Error('Empty response received');
            }
            try {
                return JSON.parse(text);
            } catch (e) {
                console.error('JSON Parse Error:', e, 'Response:', text);
                throw e;
            }
        } catch (error) {
            console.warn(`Attempt ${i + 1} failed:`, error);
            if (i === maxRetries - 1) throw error;
            await new Promise(resolve => setTimeout(resolve, 1000 * (i + 1))); // Exponential backoff
        }
    }
};

// Helper function for getServiceAccountToken
async function getGoogleSettings() {
    return new Promise((resolve) => {
        chrome.storage.local.get(['googleSettings'], (result) => {
            // console.log('Retrieved Google settings:', result.googleSettings);
            resolve(result.googleSettings || null);
        });
    });
}

async function getServiceAccountToken() {
    try {
        const googleSettings = await getGoogleSettings();
        if (!googleSettings || !googleSettings.clientEmail || !googleSettings.privateKey) {
            throw new Error('Google credentials not configured.');
        }

        const now = Math.floor(Date.now() / 1000);
        const jwtHeader = {
            alg: 'RS256',
            typ: 'JWT'
        };
        
        const jwtPayload = {
            iss: googleSettings.clientEmail,
            sub: googleSettings.clientEmail,
            aud: 'https://oauth2.googleapis.com/token',
            scope: 'https://www.googleapis.com/auth/spreadsheets https://www.googleapis.com/auth/drive.file',
            exp: now + 3600,
            iat: now
        };

        const base64Header = btoa(JSON.stringify(jwtHeader)).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
        const base64Payload = btoa(JSON.stringify(jwtPayload)).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
        
        const signInput = `${base64Header}.${base64Payload}`;

        const pemHeader = "-----BEGIN PRIVATE KEY-----";
        const pemFooter = "-----END PRIVATE KEY-----";
        const pemContents = googleSettings.privateKey
            .replace(/\\n/g, '\n')
            .replace(pemHeader, '')
            .replace(pemFooter, '')
            .replace(/\s/g, '');

        const binaryKey = Uint8Array.from(atob(pemContents), c => c.charCodeAt(0));
        
        const cryptoKey = await window.crypto.subtle.importKey(
            'pkcs8',
            binaryKey,
            {
                name: 'RSASSA-PKCS1-v1_5',
                hash: { name: 'SHA-256' },
            },
            false,
            ['sign']
        );

        const signature = await window.crypto.subtle.sign(
            'RSASSA-PKCS1-v1_5',
            cryptoKey,
            new TextEncoder().encode(signInput)
        );
        
        const jwt = `${signInput}.${btoa(String.fromCharCode(...new Uint8Array(signature))).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '')}`;

        const tokenResponse = await fetch('https://oauth2.googleapis.com/token', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded'
            },
            body: new URLSearchParams({
                grant_type: 'urn:ietf:params:oauth:grant-type:jwt-bearer',
                assertion: jwt
            })
        });

        const tokenData = await tokenResponse.json();
        
        if (!tokenResponse.ok) {
            console.error('Token Error:', tokenData);
            throw new Error(`Token error: ${tokenData.error_description || tokenData.error}`);
        }

        return tokenData.access_token;
    } catch (error) {
        console.error('Detailed token error:', error);
        throw error;
    }
}

async function handlePageAction(pageType, releaseId, displayContainerId, updateButtonId, dataAction, updateFunction) {
    try {
        const tabs = await chrome.tabs.query({ active: true, currentWindow: true });
        await chrome.scripting.executeScript({
            target: { tabId: tabs[0].id },
            files: ['content.js']
        });

        await new Promise(resolve => setTimeout(resolve, 100));

        const response = await chrome.tabs.sendMessage(tabs[0].id, {
            action: dataAction,
            releaseId: releaseId
        });

        const displayContainer = document.getElementById(displayContainerId);
        if (response) {
            updateFunction(response, displayContainer, updateButtonId, releaseId);
        } else {
            displayContainer.innerHTML = `<div class="data-row">Error fetching ${pageType} data</div>`;
        }
    } catch (error) {
        document.getElementById(displayContainerId).innerHTML = `<div class="data-row">Error: ${error.message || `Failed to fetch ${pageType} data`}</div>`;
    }
}