mod argument;
mod config;
mod database;

use argument::Argument;
use chrono::Local;
use clap::Parser;
use config::Config;
use database::Database;
use log::*;
use rustypipe::client::RustyPipe;
use std::{env::var, process::Command, thread, time::Duration};

#[tokio::main]
async fn main() {
    if var("RUST_LOG").is_ok() {
        use tracing_subscriber::{EnvFilter, fmt::*};
        struct T;
        impl time::FormatTime for T {
            fn format_time(&self, w: &mut format::Writer<'_>) -> std::fmt::Result {
                write!(w, "{}", Local::now())
            }
        }
        fmt()
            .with_timer(T)
            .with_env_filter(EnvFilter::from_default_env())
            .init()
    }

    let argument = Argument::parse();
    let config: Config =
        toml::from_str(&std::fs::read_to_string(&argument.config).unwrap()).unwrap();
    let update = config.update.map(Duration::from_secs);
    let sleep = config.sleep.map(Duration::from_secs);
    let mut database = Database::new(&config.database).unwrap();
    let rp = RustyPipe::new();

    loop {
        info!("begin {} channels update...", config.channel.len());
        for (c, channel) in &config.channel {
            debug!("get `{c}` ({})...", channel.id);
            match rp.query().channel_videos(&channel.id).await {
                Ok(result) => {
                    let items = result.content.items;
                    debug!(
                        "received {:?} items to handle, limit: {:?}...",
                        items.len(),
                        channel.items_limit
                    );
                    for (i, item) in items.into_iter().enumerate() {
                        if channel.items_limit.is_some_and(|l| i >= l) {
                            debug!("items limit for channel `{c}` reached at {i}; break.");
                            break;
                        }
                        if channel
                            .item_name_regex
                            .as_ref()
                            .is_some_and(|regex| regex.is_match(&item.name))
                        {
                            debug!(
                                "item name `{}` for channel `{c}` does not match pattern `{}`; skip.",
                                &item.name,
                                &channel.item_name_regex.as_ref().unwrap()
                            );
                            continue;
                        }
                        match database.get(&item.id) {
                            Ok(id) => {
                                if id.is_some() {
                                    debug!(
                                        "item `{}` for channel `{c}` already processed; skip handle.",
                                        item.id
                                    );
                                    continue;
                                }
                            }
                            Err(e) => panic!(
                                "can't check item `{}` in DB for channel `{c}`: {e}",
                                item.id
                            ),
                        }
                        if item.is_live != channel.is_live {
                            debug!(
                                "skip item `{}` for channel `{c}` by `is_live` filter (item: {:?}/config:{:?})",
                                item.id, item.is_live, channel.is_live
                            );
                            continue;
                        }
                        if item.is_short != channel.is_short {
                            debug!(
                                "skip item `{}` for channel `{c}` by `is_short` filter (item: {:?}/config:{:?})",
                                item.id, item.is_short, channel.is_short
                            );
                            continue;
                        }
                        if item.is_upcoming != channel.is_upcoming {
                            debug!(
                                "skip item `{}` for channel `{c}` by `is_upcoming` filter (item: {:?}/config:{:?})",
                                item.id, item.is_upcoming, channel.is_upcoming
                            );
                            continue;
                        }
                        for command in &channel.command {
                            let cmd = command.exec.replace("{ID}", &item.id);
                            match Command::new("sh").arg("-c").arg(&cmd).output() {
                                Ok(response) => {
                                    if response.status.success() {
                                        if command.stdout_contains.as_ref().is_none_or(|s| {
                                            String::from_utf8_lossy(&response.stdout).contains(s)
                                        }) {
                                            match database.process(&item.id) {
                                                Ok(()) => info!(
                                                    "exec `{cmd}` for channel `{c}` successful: `{:?}`",
                                                    response
                                                ),
                                                Err(e) => panic!(
                                                    "can't persist processed item `{}` for channel `{c}` by `{cmd}`: `{e}`",
                                                    item.id
                                                ),
                                            }
                                        } else {
                                            warn!(
                                                "unexpected exec `{cmd}` for channel `{c}`: `{:?}`",
                                                response
                                            )
                                        }
                                    } else {
                                        warn!(
                                            "exec `{cmd}` for channel `{c}` failed: `{:?}`",
                                            response
                                        )
                                    }
                                }
                                Err(e) => {
                                    warn!("can't execute command `{cmd}` for channel `{c}`: `{e}`")
                                }
                            }
                        }
                        if let Some(duration) = sleep {
                            debug!("await {} seconds to continue...", duration.as_secs());
                            thread::sleep(duration)
                        }
                    }
                }
                Err(e) => warn!("can't scrape channel `{c}`: `{e}`"),
            }
        }
        match update {
            Some(duration) => {
                info!(
                    "queue completed; await {} seconds to continue...",
                    duration.as_secs()
                );
                thread::sleep(duration)
            }
            None => {
                info!("all tasks completed; exit.");
                break;
            }
        }
    }
}