//! parse config from config.toml and read work-dir argument if provided.
//!
//!
//!   Arguments:
//!   - __work-dir__(optional): specify the work dir, where to download crates, rust toolchains and storage logs, default: $HOME/.freighter
//!   
//!   example:
//!
//!   ```bash  
//!   freighter --work-dir /mnt/data/
//!   or
//!   freighter -c /mnt/data/
//!   ```
//!

use std::path::{PathBuf, Path};
use std::str::FromStr;

use clap::{arg, crate_version, ArgMatches};
use log4rs::append::console::ConsoleAppender;
use log4rs::append::rolling_file::policy::compound::roll::delete::DeleteRoller;
use log4rs::append::rolling_file::policy::compound::trigger::size::SizeTrigger;
use log4rs::append::rolling_file::policy::compound::CompoundPolicy;
use log4rs::append::rolling_file::RollingFileAppender;
use log4rs::config::runtime::Config as Log4rsConfig;
use log4rs::config::Logger;
use log4rs::config::{Appender, Root};
use log4rs::encode::pattern::PatternEncoder;
use tracing::log::LevelFilter;

use crate::commands::{self};
use crate::config::{Config, LogConfig};
use crate::errors::{FreightResult, FreighterError};

///
///
///
///
///

pub type App = clap::Command;

///
///
pub fn main(config: &mut Config) -> FreightResult {
    // log4rs::init_file("log4rs.yaml", Default::default()).unwrap();

    let args = cli().try_get_matches().unwrap_or_else(|e| e.exit());

    let config_parent = args.get_one::<String>("config-path").cloned().map(PathBuf::from);
    let mut config = config.load(config_parent);

    let (cmd, subcommand_args) = match args.subcommand() {
        Some((cmd, args)) => (cmd, args),
        _ => {
            // No subcommand provided.
            cli().print_help()?;
            return Ok(());
        }
    };

    execute_subcommand(&mut config, cmd, subcommand_args)
}

///
///
fn cli() -> App {
    let usage = "freighter [SUBCOMMAND]";

    App::new("freighter")
        .version(crate_version!())
        .disable_colored_help(true)
        .disable_help_subcommand(true)
        .override_usage(usage)
        .author("Open Rust Initiative")
        .arg(arg!(-c --"config-path" <FILE> "specify the config path, default: $HOME/freighter/config.toml")
        )
        .help_template(
            "\
Freighter - A crate registry from the Open Rust Initiative Community

USAGE:
    {usage}

Some common freighter commands are (see all commands with --list):
    crates    Sync the index and crate files from the upstream to local, cloud or registry
    rustup    Sync the rustup files from the upstream to local, cloud or registry
    channel   Sync the toolchain files from the upstream to local, cloud or registry
    server    Start git and file http server 

See 'freighter help <command>' for more information on a specific command.\n"
        )
        .subcommands(commands::builtin())
}

///
///
pub fn execute_subcommand(config: &mut Config, cmd: &str, args: &ArgMatches) -> FreightResult {
    if let Some(f) = commands::builtin_exec(cmd) {
        f(config, args)
    } else {
        Err(FreighterError::unknown_command(cmd.to_string()))
    }
}
/// read values(log format encoder, log limit and level) from config file
/// and then initialize config for log4rs, log will preserve in /log_path/log by default
pub fn init_log(config: &LogConfig, log_path: &Path, sub_command: &str) -> FreightResult {
    // attach file name
    let binding = log_path.join(format!("{}.log", sub_command));
    let log_path = binding.to_str().unwrap();
    let level = LevelFilter::from_str(&config.level).unwrap();

    let encoder = PatternEncoder::new(&config.encoder);

    let stdout = ConsoleAppender::builder()
        .encoder(Box::new(encoder.clone()))
        .build();

    let policy = CompoundPolicy::new(
        Box::new(SizeTrigger::new(config.limit * 1024 * 1024)),
        Box::<DeleteRoller>::default(),
    );

    let file = RollingFileAppender::builder()
        .encoder(Box::new(encoder))
        .build(log_path, Box::new(policy))
        .unwrap();

    let log4rs_config = Log4rsConfig::builder()
        .appender(Appender::builder().build("stdout", Box::new(stdout)))
        .appender(Appender::builder().build("file", Box::new(file)))
        .logger(
            Logger::builder()
                .appender("file")
                .additive(false)
                .build("app::file", level),
        )
        .build(
            Root::builder()
                .appender("stdout")
                .appender("file")
                .build(level),
        )
        .unwrap();

    log4rs::init_config(log4rs_config).unwrap();

    Ok(())
}