#[macro_use]
extern crate serde_derive;
extern crate toml;
extern crate fern;
extern crate chrono;
#[macro_use]
extern crate clap;
#[macro_use]
extern crate log;

use std::fs::File;
use std::fs;
use std::io::prelude::*;
use std::fs::Permissions;
use std::os::unix::fs::PermissionsExt;

#[derive(Serialize, Deserialize)]
pub struct Config {
    pub folders: Vec<Folder>,
    pub reduce_to_config: bool,
}

#[derive(Serialize, Deserialize)]
pub struct Folder {
    pub path: String,
    pub scripts: Vec<Script>,
}

#[derive(Serialize, Deserialize)]
pub struct Script {
    pub name: String,
    pub commands: Vec<String>,
}


fn main() {
    let clap = setup_clap();
    let mut verbosity : usize = 0;
    setup_fern(match clap.occurrences_of("v") {
        0 => log::LogLevelFilter::Error,
        1 => log::LogLevelFilter::Warn,
        2 => log::LogLevelFilter::Info,
        3 => log::LogLevelFilter::Debug,
        4 => log::LogLevelFilter::Trace,
        n => {
            verbosity = n as usize;
            log::LogLevelFilter::Trace
        }
    });

    check_verbosity(verbosity);

    let mut file = match File::open("foo.txt") {
        Ok(file) => file,
        Err(_) => {
            error!("error opening file");
            return;
        }
    };
    let mut contents = String::new();
    match file.read_to_string(&mut contents) {
        Ok(_) => info!("read file to string successfully"),
        Err(_) => {
            error!("couldn't read file to string");
            return;
        }
    };
    let config: Config = match toml::from_str(&contents) {
        Ok(config) => {
            info!("successfully deserialized config file");
            config
        }
        Err(_) => {
            error!("couldn't deserialize config file");
            return;
        }
    };

    for folder in config.folders {
        if config.reduce_to_config {
            match fs::remove_dir_all(&folder.path) {
                Ok(_) => info!("cleared folder {}", folder.path),
                Err(_) => warn!("couldn't clear folder {}", folder.path),
            };
        }

        match fs::DirBuilder::new().recursive(true).create(&folder.path) {
            Err(_) => warn!("couldn't make sure folder {} existed", folder.path),
            _ => {}
        }
        for script in folder.scripts {
            let mut script_string = String::new();
            script_string.push_str("#!/bin/sh\n");
            script_string.push_str("# DO NOT EDIT THIS MANUALLY\n");
            script_string.push_str("# THIS HAS BEEN GENERATED BY run-parts-gen-rs\n");
            for command in script.commands {
                script_string.push_str(&command);
                script_string.push_str("\n");
            }
            let mut script_file = match File::create(&format!(
                "{}{}{}",
                folder.path,
                std::path::MAIN_SEPARATOR,
                script.name
            )) {
                Ok(file) => file,
                Err(_) => {
                    warn!(
                        "couldn't open script {}{}{} for writing",
                        folder.path,
                        std::path::MAIN_SEPARATOR,
                        script.name
                    );
                    continue;
                }
            };
            match script_file.write_all(script_string.as_bytes()) {
                Ok(_) => info!("script {} written successfully", script.name),
                Err(_) => warn!("error writing script {}", script.name),
            };
            match script_file.set_permissions(Permissions::from_mode(0o755)) {
                Ok(_) => info!("made script {} executable", script.name),
                Err(_) => warn!("couldn't make script {} executable", script.name),
            }
        }
    }
}

fn check_verbosity(verbosity: usize) {
    if verbosity > 4 {
        trace!("specifying more than 4 doesn't do anything");
        trace!("did you really expect {} different levels?!", verbosity)
    }
}

fn setup_fern(level: log::LogLevelFilter) {
    match fern::Dispatch::new()
        .format(|out, message, record| {
            out.finish(format_args!(
                "[{}][{}] {}",
                chrono::Local::now().format("%Y-%m-%d %H:%M:%S"),
                record.level(),
                message
            ))
        })
        .level(level)
        .chain(std::io::stdout())
        .apply() {
        Err(_) => {
            eprintln!("error setting up logging!");
        }
        _ => info!("logging set up properly"),
    }
}

fn setup_clap() -> (clap::ArgMatches<'static>) {
    clap_app!(myapp =>
        (name: crate_name!())
        (version: crate_version!())
        (author: crate_authors!())
        (about: crate_description!())
        (@arg CONFIG: +required "Set config file to use")
        (@arg v: -v --verbose ... "Be verbose (you can add this up to 4 times for more logs)")
    ).get_matches()
}