// Shared JavaScript across all pages
class GitHubAnalyzer {
    constructor() {
        this.baseURL = 'https://api.github.com';
        this.init();
    }

    init() {
        this.bindEvents();
    }

    bindEvents() {
        const repoForm = document.getElementById('repoForm');
        if (repoForm) {
            repoForm.addEventListener('submit', (e) => this.handleRepoSubmit(e));
        }
    }

    async handleRepoSubmit(e) {
        e.preventDefault();
        
        const username = document.getElementById('username').value.trim();
        const repoName = document.getElementById('repoName').value.trim();
        
        if (!username || !repoName) {
            this.showError('Please enter both username and repository name');
            return;
        }

        this.showLoading();
        this.showResultsSection();

        try {
            const repoData = await this.fetchRepoData(username, repoName);
            const contributorData = await this.fetchContributors(username, repoName);
            const languagesData = await this.fetchLanguages(username, repoName);
            
            this.displayAnalysisResults(repoData, contributorData, languagesData);
        } catch (error) {
            this.showError('Failed to fetch repository data. Please check the username and repository name.');
            console.error('Error:', error);
        } finally {
            this.hideLoading();
        }
    }

    async fetchRepoData(username, repoName) {
        const response = await fetch(`${this.baseURL}/repos/${username}/${repoName}`);
        if (!response.ok) {
            throw new Error('Repository not found');
        }
        return await response.json();
    }

    async fetchContributors(username, repoName) {
        const response = await fetch(`${this.baseURL}/repos/${username}/${repoName}/contributors`);
        if (!response.ok) {
            return [];
        }
        return await response.json();
    }

    async fetchLanguages(username, repoName) {
        const response = await fetch(`${this.baseURL}/repos/${username}/${repoName}/languages`);
        if (!response.ok) {
            return {};
        }
        return await response.json();
    }

    displayAnalysisResults(repoData, contributors, languages) {
        const analysisData = document.getElementById('analysisData');
        
        // Calculate metrics
        const stars = repoData.stargazers_count;
        const forks = repoData.forks_count;
        const openIssues = repoData.open_issues_count;
        const watchers = repoData.watchers_count;
        const sizeKB = Math.round(repoData.size / 1024);
        const createdAt = new Date(repoData.created_at).toLocaleDateString();
        const lastUpdate = new Date(repoData.updated_at).toLocaleDateString();
        
        // Language distribution
        const totalBytes = Object.values(languages).reduce((sum, bytes) => sum + bytes, 0);
        const languagePercentages = Object.entries(languages).map(([lang, bytes]) => ({
            language: lang,
            percentage: Math.round((bytes / totalBytes) * 100)
        }));

        analysisData.innerHTML = `
            <!-- Repository Overview -->
            <div class="analysis-card bg-white/10 backdrop-blur-lg rounded-xl p-6 border border-white/20">
                <h3 class="text-xl font-semibold text-white mb-4 flex items-center">
                    <i data-feather="book" class="mr-2"></i>
                    Repository Overview
                </h3>
                <div class="grid grid-cols-2 md:grid-cols-4 gap-4">
                    <div class="text-center">
                        <div class="text-2xl font-bold text-purple-400">${stars}</div>
                        <div class="text-sm text-gray-300">Stars</div>
                    </div>
                    <div class="text-center">
                        <div class="text-2xl font-bold text-purple-400">${forks}</div>
                        <div class="text-sm text-gray-300">Forks</div>
                    </div>
                    <div class="text-center">
                        <div class="text-2xl font-bold text-purple-400">${openIssues}</div>
                        <div class="text-sm text-gray-300">Open Issues</div>
                    </div>
                    <div class="text-center">
                        <div class="text-2xl font-bold text-purple-400">${watchers}</div>
                        <div class="text-sm text-gray-300">Watchers</div>
                    </div>
                </div>
            </div>

            <!-- Language Distribution -->
            <div class="analysis-card bg-white/10 backdrop-blur-lg rounded-xl p-6 border border-white/20">
                <h3 class="text-xl font-semibold text-white mb-4 flex items-center">
                    <i data-feather="code" class="mr-2"></i>
                Languages
                </h3>
                <div class="space-y-3">
                    ${languagePercentages.map(lang => `
                        <div class="flex items-center justify-between">
                            <span class="text-gray-300">${lang.language}</span>
                            <span class="text-purple-400 font-semibold">${lang.percentage}%</span>
                        </div>
                    `).join('')}
                </div>
            </div>

            <!-- Contributors -->
            <div class="analysis-card bg-white/10 backdrop-blur-lg rounded-xl p-6 border border-white/20">
                <h3 class="text-xl font-semibold text-white mb-4 flex items-center">
                    <i data-feather="users" class="mr-2"></i>
                Contributors (${contributors.length})
                </h3>
                <div class="grid grid-cols-2 md:grid-cols-4 gap-4">
                    ${contributors.slice(0, 8).map(contributor => `
                    <div class="text-center">
                        <img src="${contributor.avatar_url}" alt="${contributor.login}" class="w-12 h-12 rounded-full mx-auto mb-2 border-2 border-purple-400">
                        <div class="text-sm text-gray-300 truncate">${contributor.login}</div>
                        <div class="text-xs text-purple-400">${contributor.contributions} commits</div>
                    </div>
                `).join('')}
                </div>
            </div>

            <!-- Repository Details -->
            <div class="analysis-card bg-white/10 backdrop-blur-lg rounded-xl p-6 border border-white/20">
                <h3 class="text-xl font-semibold text-white mb-4 flex items-center">
                <i data-feather="info" class="mr-2"></i>
                Repository Details
                </h3>
                <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                    <div class="flex justify-between">
                        <span class="text-gray-300">Size</span>
                        <span class="text-purple-400">${sizeKB} KB</span>
                    </div>
                    <div class="flex justify-between">
                        <span class="text-gray-300">Created</span>
                        <span class="text-purple-400">${createdAt}</span>
                    </div>
                    <div class="flex justify-between">
                        <span class="text-gray-300">Last Updated</span>
                        <span class="text-purple-400">${lastUpdate}</span>
                    </div>
                    <div class="flex justify-between">
                        <span class="text-gray-300">Default Branch</span>
                        <span class="text-purple-400">${repoData.default_branch}</span>
                    </div>
                </div>
            </div>

            <!-- Repository Description -->
            ${repoData.description ? `
            <div class="analysis-card bg-white/10 backdrop-blur-lg rounded-xl p-6 border border-white/20">
                <h3 class="text-xl font-semibold text-white mb-4 flex items-center">
                <i data-feather="file-text" class="mr-2"></i>
                Description
                </h3>
                <p class="text-gray-300">${repoData.description}</p>
            </div>
            ` : ''}
        `;

        feather.replace();
    }

    showLoading() {
        const loading = document.getElementById('loading');
        if (loading) loading.classList.remove('hidden');
    }

    hideLoading() {
        const loading = document.getElementById('loading');
        if (loading) loading.classList.add('hidden');
    }

    showResultsSection() {
        const results = document.getElementById('results');
        if (results) results.classList.remove('hidden');
    }

    showError(message) {
        alert(message); // In a real app, you'd use a better notification system
    }
}

// Initialize the analyzer when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    new GitHubAnalyzer();
});

// Utility function for API calls
async function fetchWithErrorHandling(url, options = {}) {
    const response = await fetch(url, options);
    if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
    }
    return await response.json();
}