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extern crate codegen;
extern crate inflector;
extern crate regex;

use codegen::Scope;
use codegen::Type;
use inflector::Inflector;
use lazy_static::lazy_static;
use regex::Regex;
use std::fmt;
use std::fs::File;
use std::fs::{self};
use std::io;
use std::io::prelude::*;
use std::path::Path;
use std::process::Command;

#[derive(Clone, Debug)]
enum IconType {
    SOLID,
    REGULAR,
    BRANDS,
}

impl fmt::Display for IconType {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(self, f)
    }
}

#[derive(Clone)]
struct IconSource {
    path: std::path::PathBuf,
    icon_type: IconType,
}

lazy_static! {
    static ref REGX: Regex = Regex::new(r"(.*)/fa([^/]+)\.js$").unwrap();
    static ref REGX_W: Regex = Regex::new("A-Z").unwrap();
}

fn write_rs(name: String, icon_type: IconType) -> io::Result<()> {
    let mut scope = Scope::new();

    let type_class = match icon_type {
        IconType::SOLID => "fas",
        IconType::REGULAR => "far",
        IconType::BRANDS => "fab",
    };

    let kebab_case_name: String = name.to_kebab_case();

    scope.import("seed::prelude", "i");
    scope.import("seed::prelude", "C");

    scope
        .new_fn("icon")
        .vis("pub")
        .generic("T")
        .ret("Node<T>")
        .arg("classes", Type::new("Vec<&str>"))
        .line(format!(
            r#"i![C!["{}", "fa-{}", classes]]"#,
            type_class, kebab_case_name
        ));

    let filename = format!(
        "src/fa/{}/{}.rs",
        icon_type.to_string().to_lowercase(),
        name
    );
    let mut file = File::create(filename)?;
    file.write_all(scope.to_string().as_bytes())?;
    Ok(())
}

fn visit_folder(dir: &str, icon_type: IconType) -> Result<Vec<IconSource>, io::Error> {
    let entries = fs::read_dir(dir)?
        .map(|res| {
            res.map(|e| IconSource {
                path: e.path(),
                icon_type: icon_type.clone(),
            })
        })
        .collect::<Result<Vec<_>, io::Error>>()?;
    Ok(entries)
}

fn visit() -> Result<Vec<IconSource>, io::Error> {
    let mut icons = visit_folder(
        "./Font-Awesome/js-packages/@fortawesome/free-solid-svg-icons/",
        IconType::SOLID,
    )?;
    let regular = visit_folder(
        "./Font-Awesome/js-packages/@fortawesome/free-regular-svg-icons/",
        IconType::REGULAR,
    )?;
    let brands = visit_folder(
        "./Font-Awesome/js-packages/@fortawesome/free-brands-svg-icons/",
        IconType::BRANDS,
    )?;
    icons.extend(regular.iter().cloned());
    icons.extend(brands.iter().cloned());
    Ok(icons)
}

fn write_if_js(path_f: &str, icon_type: IconType) -> Option<Result<(), io::Error>> {
    let res = REGX
        .captures_iter(path_f)
        .filter_map(|cap| {
            let groups = (cap.get(2), cap.get(0));
            let res: Option<Result<(), io::Error>> = match groups {
                (Some(_), Some(_)) => {
                    let base = &cap[2];
                    let file = format!("{}.rs", base);
                    match write_rs(String::from(base), icon_type.clone()) {
                        Ok(_) => Some(Ok(())),
                        Err(whatever) => {
                            println!("cargo:warning=Failed to write file {}: {}", file, whatever);
                            Some(Err(whatever))
                        }
                    }
                }
                _ => None,
            };
            res
        })
        .next();
    res
}

pub fn write_all() -> std::io::Result<()> {
    clone_if_not();
    match visit().map(|files| {
        let strings = files.into_iter();
        strings
            .into_iter()
            .map(|icon| {
                let path = icon.path.to_str();
                match path {
                    None => {
                        println!("cargo:warning=Cannot get one of the files");
                        Ok(())
                    }
                    Some(path_f) => match write_if_js(path_f, icon.icon_type) {
                        None => Ok(()),
                        Some(res) => res,
                    },
                }
            })
            .collect()
    }) {
        Ok(Ok(())) => Ok(()),
        Ok(Err(writeerr)) => Err(writeerr),
        Err(readerr) => Err(readerr),
    }
}

fn clone_if_not() {
    if !Path::new("./Font-Awesome").exists() {
        Command::new("git")
            .arg("clone")
            .arg("https://github.com/FortAwesome/Font-Awesome")
            .output()
            .expect("failed to execute process");
    }
}