// WebsiteService.swift
// CxIDE — Static website generation with templates and local preview
//
// Generates HTML/CSS/JS projects from built-in templates.
// Supports local preview via a lightweight HTTP server.

import Foundation
#if canImport(Network)
import Network
#endif

// MARK: - Website Service

@MainActor
final class WebsiteService: ObservableObject {
    @Published var projects: [WebsiteProject] = []
    @Published var previewPort: Int = 8080
    @Published var isPreviewRunning: Bool = false

    private var previewProcess: Process?

    // MARK: - Project Creation

    /// Create a new website project from a template
    func createProject(
        name: String,
        template: WebsiteTemplate,
        at directory: URL
    ) throws -> WebsiteProject {
        let projectDir = directory.appendingPathComponent(name)
        let fm = FileManager.default

        guard !fm.fileExists(atPath: projectDir.path) else {
            throw WebsiteError.projectExists(name)
        }

        try fm.createDirectory(at: projectDir, withIntermediateDirectories: true)

        // Generate files from template
        let files = template.generateFiles(name)
        for (relativePath, content) in files {
            let fileURL = projectDir.appendingPathComponent(relativePath)
            let parentDir = fileURL.deletingLastPathComponent()
            if !fm.fileExists(atPath: parentDir.path) {
                try fm.createDirectory(at: parentDir, withIntermediateDirectories: true)
            }
            try content.write(to: fileURL, atomically: true, encoding: String.Encoding.utf8)
        }

        let project = WebsiteProject(
            name: name,
            directory: projectDir,
            template: template.id,
            createdAt: Date()
        )
        projects.append(project)
        return project
    }

    // MARK: - Local Preview

    /// Start a local HTTP server for previewing
    func startPreview(projectDir: URL, port: Int = 8080) throws {
        stopPreview()
        previewPort = port

        // Use Python's built-in HTTP server (available on macOS)
        let proc = Process()
        proc.executableURL = URL(fileURLWithPath: "/usr/bin/python3")
        proc.arguments = ["-m", "http.server", "\(port)", "--directory", projectDir.path]
        proc.currentDirectoryURL = projectDir

        proc.terminationHandler = { [weak self] _ in
            Task { @MainActor [weak self] in
                self?.isPreviewRunning = false
            }
        }

        try proc.run()
        previewProcess = proc
        isPreviewRunning = true
    }

    /// Stop the local preview server
    func stopPreview() {
        if let proc = previewProcess, proc.isRunning {
            proc.terminate()
        }
        previewProcess = nil
        isPreviewRunning = false
    }

    /// Get the preview URL
    var previewURL: URL? {
        isPreviewRunning ? URL(string: "http://localhost:\(previewPort)") : nil
    }
}

// MARK: - Website Project

struct WebsiteProject: Identifiable, Codable, Sendable {
    let id: UUID
    let name: String
    let directory: URL
    let template: String
    let createdAt: Date
    var deployedURL: String?
    var domain: String?

    init(name: String, directory: URL, template: String, createdAt: Date) {
        self.id = UUID()
        self.name = name
        self.directory = directory
        self.template = template
        self.createdAt = createdAt
    }
}

// MARK: - Website Template

struct WebsiteTemplate: Identifiable, Sendable {
    let id: String
    let name: String
    let description: String
    let category: String
    let previewImageName: String?

    /// Generate the files for this template
    let generateFiles: @Sendable (_ projectName: String) -> [(path: String, content: String)]

    // MARK: - Built-in Templates

    static let allTemplates: [WebsiteTemplate] = [
        blank, landingPage, portfolio, blog, documentation, dashboard
    ]

    static let blank = WebsiteTemplate(
        id: "blank",
        name: "Blank Site",
        description: "Empty HTML/CSS/JS project with modern defaults",
        category: "Starter",
        previewImageName: nil
    ) { name in
        [
            ("index.html", Self.blankHTML(name)),
            ("css/style.css", Self.blankCSS()),
            ("js/main.js", Self.blankJS()),
            ("README.md", "# \(name)\n\nA website built with CxIDE.\n"),
            (".gitignore", "node_modules/\n.DS_Store\n*.log\n"),
        ]
    }

    static let landingPage = WebsiteTemplate(
        id: "landing",
        name: "Landing Page",
        description: "Modern responsive landing page with hero, features, and CTA",
        category: "Marketing",
        previewImageName: nil
    ) { name in
        [
            ("index.html", Self.landingHTML(name)),
            ("css/style.css", Self.landingCSS()),
            ("js/main.js", Self.landingJS()),
            ("images/.gitkeep", ""),
            ("README.md", "# \(name)\n\nA landing page built with CxIDE.\n"),
            (".gitignore", "node_modules/\n.DS_Store\n*.log\n"),
        ]
    }

    static let portfolio = WebsiteTemplate(
        id: "portfolio",
        name: "Portfolio",
        description: "Personal portfolio with project showcase and about section",
        category: "Personal",
        previewImageName: nil
    ) { name in
        [
            ("index.html", Self.portfolioHTML(name)),
            ("css/style.css", Self.portfolioCSS()),
            ("js/main.js", Self.portfolioJS()),
            ("projects.html", Self.portfolioProjectsHTML(name)),
            ("images/.gitkeep", ""),
            ("README.md", "# \(name)\n\nA portfolio site built with CxIDE.\n"),
            (".gitignore", "node_modules/\n.DS_Store\n*.log\n"),
        ]
    }

    static let blog = WebsiteTemplate(
        id: "blog",
        name: "Blog",
        description: "Clean blog with post listing and article pages",
        category: "Content",
        previewImageName: nil
    ) { name in
        [
            ("index.html", Self.blogHTML(name)),
            ("css/style.css", Self.blogCSS()),
            ("js/main.js", Self.blogJS()),
            ("post.html", Self.blogPostHTML(name)),
            ("posts/.gitkeep", ""),
            ("README.md", "# \(name)\n\nA blog built with CxIDE.\n"),
            (".gitignore", "node_modules/\n.DS_Store\n*.log\n"),
        ]
    }

    static let documentation = WebsiteTemplate(
        id: "docs",
        name: "Documentation",
        description: "Technical documentation site with sidebar navigation",
        category: "Developer",
        previewImageName: nil
    ) { name in
        [
            ("index.html", Self.docsHTML(name)),
            ("css/style.css", Self.docsCSS()),
            ("js/main.js", Self.docsJS()),
            ("getting-started.html", Self.docsGettingStartedHTML(name)),
            ("README.md", "# \(name) Documentation\n\nDocumentation site built with CxIDE.\n"),
            (".gitignore", "node_modules/\n.DS_Store\n*.log\n"),
        ]
    }

    static let dashboard = WebsiteTemplate(
        id: "dashboard",
        name: "Dashboard",
        description: "Admin dashboard with charts, tables, and dark theme",
        category: "Application",
        previewImageName: nil
    ) { name in
        [
            ("index.html", Self.dashboardHTML(name)),
            ("css/style.css", Self.dashboardCSS()),
            ("js/main.js", Self.dashboardJS()),
            ("README.md", "# \(name)\n\nA dashboard built with CxIDE.\n"),
            (".gitignore", "node_modules/\n.DS_Store\n*.log\n"),
        ]
    }
}

// MARK: - Template HTML Generators

extension WebsiteTemplate {

    // ── Blank ──

    static func blankHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>\(name)</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <main>
                <h1>\(name)</h1>
                <p>Welcome to your new website.</p>
            </main>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func blankCSS() -> String {
        """
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        :root {
            --bg: #0a0a0a; --fg: #e8e8e8; --accent: #3b82f6;
            --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }
        body { font-family: var(--font); background: var(--bg); color: var(--fg); line-height: 1.6; }
        main { max-width: 800px; margin: 4rem auto; padding: 0 2rem; }
        h1 { font-size: 2.5rem; margin-bottom: 1rem; }
        a { color: var(--accent); text-decoration: none; }
        a:hover { text-decoration: underline; }
        """
    }

    static func blankJS() -> String {
        """
        // main.js — \(Date())
        document.addEventListener('DOMContentLoaded', () => {
            console.log('Site loaded successfully');
        });
        """
    }

    // ── Landing Page ──

    static func landingHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>\(name)</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <nav class="navbar">
                <div class="nav-brand">\(name)</div>
                <div class="nav-links">
                    <a href="#features">Features</a>
                    <a href="#pricing">Pricing</a>
                    <a href="#contact">Contact</a>
                    <a href="#" class="btn btn-primary">Get Started</a>
                </div>
            </nav>

            <section class="hero">
                <h1>Build Something Amazing</h1>
                <p>A modern solution for modern problems. Start building today.</p>
                <div class="hero-buttons">
                    <a href="#" class="btn btn-primary btn-lg">Get Started Free</a>
                    <a href="#features" class="btn btn-outline btn-lg">Learn More</a>
                </div>
            </section>

            <section id="features" class="features">
                <h2>Features</h2>
                <div class="feature-grid">
                    <div class="feature-card">
                        <div class="feature-icon">&#9889;</div>
                        <h3>Lightning Fast</h3>
                        <p>Optimized for speed and performance out of the box.</p>
                    </div>
                    <div class="feature-card">
                        <div class="feature-icon">&#128274;</div>
                        <h3>Secure</h3>
                        <p>Enterprise-grade security built into every layer.</p>
                    </div>
                    <div class="feature-card">
                        <div class="feature-icon">&#128640;</div>
                        <h3>Scalable</h3>
                        <p>Grows with your business from day one.</p>
                    </div>
                </div>
            </section>

            <section id="pricing" class="pricing">
                <h2>Simple Pricing</h2>
                <div class="pricing-grid">
                    <div class="price-card">
                        <h3>Starter</h3>
                        <div class="price">$0<span>/mo</span></div>
                        <ul>
                            <li>1 Project</li>
                            <li>Basic Support</li>
                            <li>1GB Storage</li>
                        </ul>
                        <a href="#" class="btn btn-outline">Start Free</a>
                    </div>
                    <div class="price-card featured">
                        <h3>Pro</h3>
                        <div class="price">$29<span>/mo</span></div>
                        <ul>
                            <li>Unlimited Projects</li>
                            <li>Priority Support</li>
                            <li>100GB Storage</li>
                        </ul>
                        <a href="#" class="btn btn-primary">Get Pro</a>
                    </div>
                </div>
            </section>

            <section id="contact" class="contact">
                <h2>Get In Touch</h2>
                <form class="contact-form" onsubmit="return false;">
                    <input type="email" placeholder="Your email" required>
                    <textarea placeholder="Your message" rows="4" required></textarea>
                    <button type="submit" class="btn btn-primary">Send Message</button>
                </form>
            </section>

            <footer>
                <p>&copy; 2026 \(name). Built with CxIDE.</p>
            </footer>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func landingCSS() -> String {
        """
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        :root {
            --bg: #0f172a; --fg: #e2e8f0; --accent: #3b82f6; --accent-dark: #2563eb;
            --card-bg: #1e293b; --border: #334155;
            --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }
        body { font-family: var(--font); background: var(--bg); color: var(--fg); line-height: 1.6; }

        .navbar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 4rem; border-bottom: 1px solid var(--border); }
        .nav-brand { font-size: 1.5rem; font-weight: 700; color: var(--accent); }
        .nav-links { display: flex; gap: 2rem; align-items: center; }
        .nav-links a { color: var(--fg); text-decoration: none; }

        .btn { display: inline-block; padding: 0.6rem 1.5rem; border-radius: 8px; font-weight: 600; text-decoration: none; transition: all 0.2s; cursor: pointer; border: none; font-size: 1rem; }
        .btn-primary { background: var(--accent); color: white; }
        .btn-primary:hover { background: var(--accent-dark); }
        .btn-outline { border: 2px solid var(--accent); color: var(--accent); background: transparent; }
        .btn-outline:hover { background: var(--accent); color: white; }
        .btn-lg { padding: 0.8rem 2rem; font-size: 1.1rem; }

        .hero { text-align: center; padding: 8rem 2rem; }
        .hero h1 { font-size: 3.5rem; margin-bottom: 1rem; background: linear-gradient(135deg, var(--accent), #8b5cf6); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .hero p { font-size: 1.25rem; color: #94a3b8; max-width: 600px; margin: 0 auto 2rem; }
        .hero-buttons { display: flex; gap: 1rem; justify-content: center; }

        .features, .pricing, .contact { padding: 5rem 4rem; text-align: center; }
        h2 { font-size: 2rem; margin-bottom: 3rem; }
        .feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; max-width: 1000px; margin: 0 auto; }
        .feature-card { background: var(--card-bg); padding: 2rem; border-radius: 12px; border: 1px solid var(--border); }
        .feature-icon { font-size: 2.5rem; margin-bottom: 1rem; }
        .feature-card h3 { margin-bottom: 0.5rem; }

        .pricing-grid { display: flex; gap: 2rem; justify-content: center; flex-wrap: wrap; }
        .price-card { background: var(--card-bg); padding: 2.5rem; border-radius: 12px; border: 1px solid var(--border); min-width: 280px; }
        .price-card.featured { border-color: var(--accent); transform: scale(1.05); }
        .price { font-size: 3rem; font-weight: 700; margin: 1rem 0; }
        .price span { font-size: 1rem; color: #94a3b8; }
        .price-card ul { list-style: none; margin: 1.5rem 0; }
        .price-card li { padding: 0.4rem 0; color: #94a3b8; }

        .contact-form { max-width: 500px; margin: 0 auto; display: flex; flex-direction: column; gap: 1rem; }
        .contact-form input, .contact-form textarea { padding: 0.8rem; border-radius: 8px; border: 1px solid var(--border); background: var(--card-bg); color: var(--fg); font-size: 1rem; }

        footer { text-align: center; padding: 2rem; color: #64748b; border-top: 1px solid var(--border); }

        @media (max-width: 768px) {
            .navbar { padding: 1rem 2rem; flex-direction: column; gap: 1rem; }
            .hero h1 { font-size: 2.5rem; }
            .features, .pricing, .contact { padding: 3rem 2rem; }
        }
        """
    }

    static func landingJS() -> String {
        """
        document.addEventListener('DOMContentLoaded', () => {
            // Smooth scroll for anchor links
            document.querySelectorAll('a[href^="#"]').forEach(anchor => {
                anchor.addEventListener('click', e => {
                    e.preventDefault();
                    const target = document.querySelector(anchor.getAttribute('href'));
                    if (target) target.scrollIntoView({ behavior: 'smooth' });
                });
            });

            // Animate cards on scroll
            const observer = new IntersectionObserver(entries => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        entry.target.style.opacity = '1';
                        entry.target.style.transform = 'translateY(0)';
                    }
                });
            }, { threshold: 0.1 });

            document.querySelectorAll('.feature-card, .price-card').forEach(card => {
                card.style.opacity = '0';
                card.style.transform = 'translateY(20px)';
                card.style.transition = 'all 0.6s ease';
                observer.observe(card);
            });
        });
        """
    }

    // ── Portfolio ──

    static func portfolioHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>\(name) — Portfolio</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <nav class="navbar">
                <a href="index.html" class="nav-brand">\(name)</a>
                <div class="nav-links">
                    <a href="#about">About</a>
                    <a href="projects.html">Projects</a>
                    <a href="#contact">Contact</a>
                </div>
            </nav>
            <section class="hero">
                <h1>Hi, I'm <span class="accent">\(name)</span></h1>
                <p>Developer, designer, creator.</p>
            </section>
            <section id="about" class="about">
                <h2>About Me</h2>
                <p>A passionate developer building modern web experiences.</p>
            </section>
            <section id="contact" class="contact">
                <h2>Contact</h2>
                <p>Email: hello@example.com</p>
            </section>
            <footer><p>&copy; 2026 \(name). Built with CxIDE.</p></footer>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func portfolioProjectsHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>\(name) — Projects</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <nav class="navbar">
                <a href="index.html" class="nav-brand">\(name)</a>
                <div class="nav-links">
                    <a href="index.html#about">About</a>
                    <a href="projects.html" class="active">Projects</a>
                    <a href="index.html#contact">Contact</a>
                </div>
            </nav>
            <section class="projects">
                <h2>My Projects</h2>
                <div class="project-grid">
                    <div class="project-card">
                        <h3>Project Alpha</h3>
                        <p>A full-stack web application built with modern tools.</p>
                        <div class="tags"><span>Swift</span><span>SwiftUI</span></div>
                    </div>
                    <div class="project-card">
                        <h3>Project Beta</h3>
                        <p>An open-source library for data visualization.</p>
                        <div class="tags"><span>JavaScript</span><span>D3.js</span></div>
                    </div>
                </div>
            </section>
            <footer><p>&copy; 2026 \(name). Built with CxIDE.</p></footer>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func portfolioCSS() -> String {
        """
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        :root { --bg: #0a0a0a; --fg: #e8e8e8; --accent: #10b981; --card-bg: #171717; --border: #262626; }
        body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--fg); line-height: 1.7; }
        .navbar { display: flex; justify-content: space-between; align-items: center; padding: 1.5rem 4rem; }
        .nav-brand { font-size: 1.4rem; font-weight: 700; color: var(--accent); text-decoration: none; }
        .nav-links { display: flex; gap: 2rem; }
        .nav-links a { color: var(--fg); text-decoration: none; }
        .nav-links a.active { color: var(--accent); }
        .hero { text-align: center; padding: 8rem 2rem 4rem; }
        .hero h1 { font-size: 3rem; }
        .accent { color: var(--accent); }
        .about, .projects, .contact { padding: 4rem; max-width: 900px; margin: 0 auto; }
        h2 { font-size: 2rem; margin-bottom: 1.5rem; }
        .project-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
        .project-card { background: var(--card-bg); padding: 2rem; border-radius: 12px; border: 1px solid var(--border); }
        .project-card h3 { margin-bottom: 0.5rem; }
        .tags { display: flex; gap: 0.5rem; margin-top: 1rem; }
        .tags span { background: var(--accent); color: #000; padding: 0.2rem 0.8rem; border-radius: 20px; font-size: 0.85rem; font-weight: 600; }
        footer { text-align: center; padding: 2rem; color: #666; }
        """
    }

    static func portfolioJS() -> String {
        "document.addEventListener('DOMContentLoaded', () => { console.log('Portfolio loaded'); });\n"
    }

    // ── Blog ──

    static func blogHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>\(name) — Blog</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <nav class="navbar"><a href="/" class="nav-brand">\(name)</a></nav>
            <main class="blog">
                <h1>Blog</h1>
                <article class="post-preview">
                    <time>January 15, 2026</time>
                    <h2><a href="post.html">Getting Started with Web Development</a></h2>
                    <p>A beginner's guide to building your first website with HTML, CSS, and JavaScript.</p>
                </article>
                <article class="post-preview">
                    <time>January 10, 2026</time>
                    <h2><a href="post.html">Why I Built This Blog</a></h2>
                    <p>The story behind creating a personal blog from scratch.</p>
                </article>
            </main>
            <footer><p>&copy; 2026 \(name). Built with CxIDE.</p></footer>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func blogPostHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>Blog Post — \(name)</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <nav class="navbar"><a href="index.html" class="nav-brand">\(name)</a></nav>
            <article class="post">
                <time>January 15, 2026</time>
                <h1>Getting Started with Web Development</h1>
                <p>Welcome to your first blog post. Edit this file to add your content.</p>
                <h2>Getting Started</h2>
                <p>Start by editing the HTML files in your project directory.</p>
                <pre><code>&lt;h1&gt;Hello World&lt;/h1&gt;</code></pre>
            </article>
            <footer><p>&copy; 2026 \(name). Built with CxIDE.</p></footer>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func blogCSS() -> String {
        """
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        :root { --bg: #fafafa; --fg: #1a1a1a; --accent: #2563eb; --muted: #6b7280; }
        body { font-family: Georgia, 'Times New Roman', serif; background: var(--bg); color: var(--fg); line-height: 1.8; }
        .navbar { padding: 1.5rem 4rem; border-bottom: 1px solid #e5e7eb; }
        .nav-brand { font-size: 1.4rem; font-weight: 700; color: var(--fg); text-decoration: none; }
        .blog, .post { max-width: 700px; margin: 0 auto; padding: 3rem 2rem; }
        h1 { font-size: 2.5rem; margin-bottom: 1rem; }
        h2 { font-size: 1.5rem; margin: 2rem 0 1rem; }
        time { color: var(--muted); font-size: 0.9rem; }
        .post-preview { margin-bottom: 2.5rem; padding-bottom: 2.5rem; border-bottom: 1px solid #e5e7eb; }
        .post-preview h2 a { color: var(--fg); text-decoration: none; }
        .post-preview h2 a:hover { color: var(--accent); }
        pre { background: #1e293b; color: #e2e8f0; padding: 1.5rem; border-radius: 8px; overflow-x: auto; margin: 1.5rem 0; }
        code { font-family: 'SF Mono', Menlo, monospace; }
        footer { text-align: center; padding: 2rem; color: var(--muted); }
        """
    }

    static func blogJS() -> String {
        "document.addEventListener('DOMContentLoaded', () => { console.log('Blog loaded'); });\n"
    }

    // ── Documentation ──

    static func docsHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>\(name) — Documentation</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <nav class="topnav">
                <span class="brand">\(name) Docs</span>
                <input type="search" placeholder="Search docs..." class="search-input">
            </nav>
            <div class="layout">
                <aside class="sidebar">
                    <h3>Guide</h3>
                    <ul>
                        <li><a href="index.html" class="active">Introduction</a></li>
                        <li><a href="getting-started.html">Getting Started</a></li>
                    </ul>
                    <h3>API</h3>
                    <ul>
                        <li><a href="#">Reference</a></li>
                        <li><a href="#">Examples</a></li>
                    </ul>
                </aside>
                <main class="content">
                    <h1>Introduction</h1>
                    <p>Welcome to the \(name) documentation. This guide will help you get started.</p>
                    <h2>Overview</h2>
                    <p>This is a documentation template. Edit these files to document your project.</p>
                </main>
            </div>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func docsGettingStartedHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>Getting Started — \(name) Docs</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <nav class="topnav">
                <span class="brand">\(name) Docs</span>
                <input type="search" placeholder="Search docs..." class="search-input">
            </nav>
            <div class="layout">
                <aside class="sidebar">
                    <h3>Guide</h3>
                    <ul>
                        <li><a href="index.html">Introduction</a></li>
                        <li><a href="getting-started.html" class="active">Getting Started</a></li>
                    </ul>
                </aside>
                <main class="content">
                    <h1>Getting Started</h1>
                    <h2>Installation</h2>
                    <pre><code>git clone https://github.com/your-repo.git
        cd your-repo</code></pre>
                    <h2>Quick Start</h2>
                    <p>Open <code>index.html</code> in your browser to preview the site.</p>
                </main>
            </div>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func docsCSS() -> String {
        """
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        :root { --bg: #ffffff; --fg: #1a1a2e; --accent: #3b82f6; --sidebar-bg: #f8fafc; --border: #e2e8f0; }
        body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--fg); }
        .topnav { display: flex; align-items: center; justify-content: space-between; padding: 0.8rem 2rem; border-bottom: 1px solid var(--border); }
        .brand { font-weight: 700; font-size: 1.2rem; }
        .search-input { padding: 0.4rem 1rem; border: 1px solid var(--border); border-radius: 6px; width: 250px; }
        .layout { display: flex; min-height: calc(100vh - 50px); }
        .sidebar { width: 260px; padding: 2rem 1.5rem; background: var(--sidebar-bg); border-right: 1px solid var(--border); }
        .sidebar h3 { font-size: 0.8rem; text-transform: uppercase; color: #6b7280; margin: 1.5rem 0 0.5rem; }
        .sidebar ul { list-style: none; }
        .sidebar li a { display: block; padding: 0.3rem 0.8rem; color: var(--fg); text-decoration: none; border-radius: 4px; font-size: 0.95rem; }
        .sidebar li a:hover { background: #e2e8f0; }
        .sidebar li a.active { background: var(--accent); color: white; }
        .content { flex: 1; padding: 3rem 4rem; max-width: 800px; }
        .content h1 { font-size: 2rem; margin-bottom: 1rem; }
        .content h2 { font-size: 1.4rem; margin: 2rem 0 1rem; }
        pre { background: #1e293b; color: #e2e8f0; padding: 1.2rem; border-radius: 8px; overflow-x: auto; margin: 1rem 0; }
        code { font-family: 'SF Mono', Menlo, monospace; font-size: 0.9rem; }
        """
    }

    static func docsJS() -> String {
        """
        document.addEventListener('DOMContentLoaded', () => {
            const searchInput = document.querySelector('.search-input');
            if (searchInput) {
                searchInput.addEventListener('input', e => {
                    console.log('Searching:', e.target.value);
                });
            }
        });
        """
    }

    // ── Dashboard ──

    static func dashboardHTML(_ name: String) -> String {
        """
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>\(name) — Dashboard</title>
            <link rel="stylesheet" href="css/style.css">
        </head>
        <body>
            <div class="dashboard">
                <aside class="sidebar">
                    <div class="logo">\(name)</div>
                    <nav>
                        <a href="#" class="active">&#9776; Overview</a>
                        <a href="#">&#128200; Analytics</a>
                        <a href="#">&#128101; Users</a>
                        <a href="#">&#9881; Settings</a>
                    </nav>
                </aside>
                <main>
                    <header>
                        <h1>Dashboard</h1>
                        <span class="user">Admin</span>
                    </header>
                    <div class="stats">
                        <div class="stat-card"><h3>Users</h3><div class="stat-value">1,234</div></div>
                        <div class="stat-card"><h3>Revenue</h3><div class="stat-value">$12,345</div></div>
                        <div class="stat-card"><h3>Orders</h3><div class="stat-value">567</div></div>
                        <div class="stat-card"><h3>Conversion</h3><div class="stat-value">3.2%</div></div>
                    </div>
                    <div class="table-section">
                        <h2>Recent Activity</h2>
                        <table>
                            <thead><tr><th>User</th><th>Action</th><th>Date</th><th>Status</th></tr></thead>
                            <tbody>
                                <tr><td>Alice</td><td>Purchase</td><td>Today</td><td class="status-ok">Completed</td></tr>
                                <tr><td>Bob</td><td>Sign up</td><td>Today</td><td class="status-ok">Active</td></tr>
                                <tr><td>Carol</td><td>Refund</td><td>Yesterday</td><td class="status-warn">Pending</td></tr>
                            </tbody>
                        </table>
                    </div>
                </main>
            </div>
            <script src="js/main.js"></script>
        </body>
        </html>
        """
    }

    static func dashboardCSS() -> String {
        """
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        :root { --bg: #0f172a; --fg: #e2e8f0; --sidebar: #1e293b; --card: #1e293b; --accent: #3b82f6; --border: #334155; }
        body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--fg); }
        .dashboard { display: flex; min-height: 100vh; }
        .sidebar { width: 220px; background: var(--sidebar); padding: 1.5rem; border-right: 1px solid var(--border); }
        .logo { font-size: 1.3rem; font-weight: 700; color: var(--accent); margin-bottom: 2rem; }
        .sidebar nav { display: flex; flex-direction: column; gap: 0.3rem; }
        .sidebar nav a { color: var(--fg); text-decoration: none; padding: 0.6rem 1rem; border-radius: 6px; }
        .sidebar nav a:hover, .sidebar nav a.active { background: var(--accent); color: white; }
        main { flex: 1; padding: 2rem; }
        header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
        .stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
        .stat-card { background: var(--card); padding: 1.5rem; border-radius: 12px; border: 1px solid var(--border); }
        .stat-card h3 { font-size: 0.85rem; color: #94a3b8; margin-bottom: 0.5rem; }
        .stat-value { font-size: 2rem; font-weight: 700; }
        .table-section h2 { margin-bottom: 1rem; }
        table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 12px; overflow: hidden; }
        th, td { padding: 0.8rem 1.2rem; text-align: left; border-bottom: 1px solid var(--border); }
        th { color: #94a3b8; font-size: 0.85rem; text-transform: uppercase; }
        .status-ok { color: #10b981; }
        .status-warn { color: #f59e0b; }
        """
    }

    static func dashboardJS() -> String {
        """
        document.addEventListener('DOMContentLoaded', () => {
            // Animate stat values
            document.querySelectorAll('.stat-value').forEach(el => {
                el.style.opacity = '0';
                el.style.transform = 'translateY(10px)';
                el.style.transition = 'all 0.4s ease';
                setTimeout(() => {
                    el.style.opacity = '1';
                    el.style.transform = 'translateY(0)';
                }, 100);
            });
        });
        """
    }
}

// MARK: - Errors

enum WebsiteError: LocalizedError {
    case projectExists(String)
    case templateNotFound(String)
    case previewFailed(String)

    var errorDescription: String? {
        switch self {
        case .projectExists(let name): return "Project '\(name)' already exists"
        case .templateNotFound(let id): return "Template '\(id)' not found"
        case .previewFailed(let msg): return "Preview failed: \(msg)"
        }
    }
}