use serde::Serialize;
use std::path::Path;

const INDEX_TEMPLATE: &str = include_str!("../assets/index.html");
const NOT_FOUND_TEMPLATE: &str = include_str!("../assets/404.html");

#[derive(Debug, Serialize, Clone)]
pub struct AppProject {
    pub name: String,
    pub route_path: String,
}

pub fn scan_projects(root: &Path) -> Vec<AppProject> {
    let mut projects = Vec::new();

    let Ok(read_dir) = std::fs::read_dir(root) else {
        return projects;
    };

    for item in read_dir.flatten() {
        let path = item.path();
        let name = item.file_name().to_string_lossy().to_string();

        if name.starts_with('.') {
            continue;
        }

        if path.is_dir() {
            let has_index = path.join("index.html").exists() || path.join("index.htm").exists();
            if has_index {
                let route_path = format!("/{}/", name);
                projects.push(AppProject { name, route_path });
            }
        }
    }

    projects.sort_by(|a, b| a.name.to_lowercase().cmp(&b.name.to_lowercase()));
    projects
}

pub fn render_dashboard(projects: &[AppProject]) -> String {
    let mut cards_html = String::new();

    for proj in projects {
        // 提取首字符作为圆形头像字母
        let initial = proj.name.chars().next().unwrap_or('A').to_uppercase().to_string();

        cards_html.push_str(&format!(
            r#"
            <a class="site-item" href="{url}" title="{name}">
                <div class="site-avatar">{initial}</div>
                <div class="site-info">
                    <span class="site-name">{name}</span>
                    <span class="site-desc">本地托管应用 • {url}</span>
                </div>
            </a>
            "#,
            url = proj.route_path,
            name = proj.name,
            initial = initial
        ));
    }

    let final_cards = if cards_html.is_empty() {
        r#"<div class="empty-state">当前目录下暂无含有 index.html 的前端项目</div>"#.to_string()
    } else {
        cards_html
    };

    INDEX_TEMPLATE.replace("__CARDS__", &final_cards)
}

pub fn render_not_found(path: &str) -> String {
    NOT_FOUND_TEMPLATE.replace("__PATH__", path)
}