use std::fs;

use risp::law::{Content, Heading, HeadingContent, Law, Section};

use crate::part::Parts;

fn print_content(content: Content) -> String {
    let mut ret = String::new();

    match content {
        Content::Text(t) => ret.push_str(&format!("<span class='content'>{t}</span>")),
        Content::List(l) => {
            ret.push_str("<ul class='content list'>");
            for item in l {
                if let Content::List(_) = item {
                    ret.push_str(&print_content(item));
                } else {
                    ret.push_str("<li>");
                    ret.push_str(&print_content(item));
                    ret.push_str("</li>");
                }
            }
            ret.push_str("</ul>");
        }
        Content::Multi(l) => {
            ret.push_str("<div class='multi'>");
            for item in l {
                ret.push_str(&print_content(item));
            }
            ret.push_str("</div>");
        }
    }

    ret
}

fn print_paragraph(section: Section) -> String {
    let mut ret = String::new();
    ret.push_str("<div class='par'>");
    ret.push_str(&format!("<span class='symb'>{}</span>", section.symb));
    if let Some(par_header) = section.par_header {
        ret.push_str(&format!("<span class='header'>{par_header}</span>"));
    }
    if let Some(note) = section.par_note {
        ret.push_str(&format!("<span class='note'>Beachte: {note}</span>"));
    }
    ret.push_str(&print_content(section.content));

    ret.push_str("</div>");
    ret
}

fn print_header(header: Heading, level: usize) -> String {
    let mut ret = String::new();
    let mut header_title = header.name.clone();
    if let Some(desc) = header.desc {
        header_title.push_str(&format!(" ({desc})"));
    }

    ret.push_str(&format!(
        "<details open='open'>\
            <summary class='sticky'><h{0}>{1}</h{0}></summary>\n\
            <div>",
        level + 2,
        header_title
    ));

    for content in header.content {
        match content {
            HeadingContent::Paragraph(p) => {
                ret.push_str(&print_paragraph(p));
            }
            HeadingContent::Heading(subheader) => {
                ret.push_str(&print_header(subheader, level + 1));
            }
        }
    }

    ret.push_str("</div></details>");

    ret
}

fn get_content(config_path: &str) -> (String, String) {
    let law = Law::from_config(config_path).unwrap();
    let lawname = law.name;

    let mut ret = String::new();
    for h in law.header {
        ret.push_str(&print_header(h, 0));
    }
    (lawname, ret)
}

/// Reads configs in `./laws` and creates a `<lawname>.html` in the `output` folder.
pub(crate) fn create_law_files() -> String {
    let mut configs: Vec<_> = fs::read_dir("./laws")
        .unwrap()
        .map(std::result::Result::unwrap)
        .collect();
    configs.sort_by_key(std::fs::DirEntry::path); // Order by name

    let mut li_of_files = String::new();
    for config in configs {
        let filename = config.file_name().into_string().unwrap();
        //TODO: use proper logic...
        let law_filename = filename.replace(".toml", "");

        let path = format!("{}", config.path().display());
        let (lawname, content) = get_content(&path);

        let template = fs::read_to_string("templates/law.html").unwrap();
        let site = template
            .replace("{{content}}", &content)
            .replace("{{title}}", &lawname);

        let site = Parts::new().perform(site);

        li_of_files.push_str(&format!(
            "<li><a href='./{law_filename}' title='{law_filename}' class='contrast'>{lawname}</a></li>"
        ));
        fs::write(&format!("output/{law_filename}.html"), &site).expect("Unable to write file");
    }

    li_of_files
}