// SPDX-FileCopyrightText: 2022 Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
// SPDX-License-Identifier: AGPL-3.0-or-later

mod api_client;
mod commands;
mod config;
mod constants;
mod event;
mod helpers;
mod recipe;

use {
    crate::api_client::ApiClient,
    crate::config::Config,
    anyhow::Result,
    clap::{arg, command, ArgMatches, Command},
    std::path::PathBuf,
};

#[tokio::main(flavor = "multi_thread")]
async fn main() -> Result<()> {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    let args = setup_args();
    parse_args(&args).await
}

fn setup_args() -> ArgMatches {
    let server_arg = arg!(-s --server <server> "NextCloud server to connect to").required(false);

    command!()
        .propagate_version(true)
        .subcommand_required(true)
        .arg_required_else_help(true)
        .subcommand(
            Command::new("init")
                .about("Authenticate against the provided NextCloud server")
                .arg(arg!(<server> "NextCloud server to connect to")),
        )
        .subcommand(
            Command::new("import")
                .about("Import the given URLs into NextCloud's cookbook")
                .arg(server_arg.clone())
                .arg(arg!(<url> ... "One or more URLs each pointing to page with a recipe to import in NextCloud")),
        )
        .subcommand(
            Command::new("groceries")
                .about("Create a grocery list from scheduled calendar events")
                .arg(server_arg.clone())
                .arg(arg!(<calendar_name> "The name of the calendar to read from for scheduled recipes"))
                .arg(arg!(<filename> "The relative path for the Markdown file that will be saved on the server. Recommended ending it in '.md'."))
                .arg(arg!(-d --days <days> "Number of days in the future to consider")
                    .value_parser(clap::builder::RangedU64ValueParser::<u32>::new().range(1..))
                    .required(false)
                    .default_value("7"))
        )
        .subcommand(
            Command::new("schedule")
                .about("TODO; not implemented yet (pick automatically recipes and create calendar events for them)")
                .arg(server_arg.clone())
                .arg(arg!(-d --days <days> "Number of days to schedule")
                    .value_parser(clap::builder::RangedU64ValueParser::<u32>::new().range(1..))
                    .required(false)
                    .default_value("7"))
        )
        .subcommand(
            Command::new("schedule-csv")
                .about("TEMPORARY WIP FUNCTION USED FOR INTERNAL TESTING")
                .arg(server_arg.clone())
                .arg(arg!(<calendar_name> ""))
                .arg(arg!(<csv_file> "").value_parser(clap::value_parser!(PathBuf)))
        )
        .subcommand(
            Command::new("purge")
                .about("Removes all events created by this application from a given calendar")
                .arg(server_arg.clone())
                .arg(arg!(<calendar_name> ""))
        )
        .get_matches()
}

async fn parse_args(args: &ArgMatches) -> Result<()> {
    let mut configuration = Config::new();

    match args.subcommand() {
        Some(("init", sub_matches)) => {
            let server = sub_matches
                .get_one::<String>("server")
                .expect("Mandatory parameter <server>");
            commands::init::with(&mut configuration, server).await
        }
        Some(("import", sub_matches)) => {
            let api_client = get_api_client(&sub_matches, &configuration)?;
            let urls = sub_matches
                .get_many::<String>("url")
                .expect("At least one url is required")
                .map(|s| s.as_str());
            commands::import::with(&api_client, urls).await
        }
        Some(("groceries", sub_matches)) => {
            let api_client = get_api_client(&sub_matches, &configuration)?;
            let calendar_name = sub_matches
                .get_one::<String>("calendar_name")
                .expect("<calendar_name> is a mandatory parameter, it cannot be missing");
            let days = sub_matches.get_one::<u32>("days").unwrap();
            let filename = sub_matches.get_one::<String>("filename").unwrap();
            commands::groceries::with(&api_client, calendar_name.as_str(), filename, *days).await
        }
        Some(("schedule", sub_matches)) => {
            let api_client = get_api_client(&sub_matches, &configuration)?;
            commands::schedule::with(&api_client).await
        }
        Some(("schedule-csv", sub_matches)) => {
            let api_client = get_api_client(&sub_matches, &configuration)?;
            let csv_file = sub_matches
                .get_one::<PathBuf>("csv_file")
                .expect("<csv_file> is a mandatory parameter, it cannot be missing");
            let calendar_name = sub_matches
                .get_one::<String>("calendar_name")
                .expect("<calendar_name> is a mandatory parameter, it cannot be missing");
            commands::schedule_csv::with(&api_client, calendar_name.as_str(), &csv_file).await
        }
        Some(("purge", sub_matches)) => {
            let api_client = get_api_client(&sub_matches, &configuration)?;
            let calendar_name = sub_matches
                .get_one::<String>("calendar_name")
                .expect("<calendar_name> is a mandatory parameter, it cannot be missing");
            commands::purge::with(&api_client, calendar_name.as_str()).await
        }
        _ => unreachable!("Exhausted list of subcommands and subcommand_required prevents `None`"),
    }
}

fn get_api_client(sub_matches: &ArgMatches, configuration: &Config) -> Result<ApiClient> {
    let server_name = sub_matches
        .get_one::<String>("server")
        .unwrap_or_else(|| {
            let servers = &configuration.credentials.servers;
            match servers.len() {
                0 => panic!("No NextCloud server set up yet, use '{} init' first", env!("CARGO_BIN_NAME")),
                1 => servers.iter().next().unwrap().0,
                _ => panic!("More than one NextCloud server set up, use the '--server' option to specify which one to use. Known servers: {:#?}", servers.keys().collect::<Vec<_>>()),
            }
        });

    ApiClient::new(&server_name, &configuration)
}