#![feature(iterator_try_collect)]

use clap::{Parser, Subcommand};
use std::io::{self, Write};
use std::path::PathBuf;
use std::process::exit;

mod queries;
use queries::*;
mod datasets;
use datasets::*;
mod sync;
use sync::*;

pub fn error(msg: &str, code: i32) -> ! {
    println!("\nERROR: {}", msg);
    exit(code)
}

pub fn issue(msg: &str, code: i32) -> ! {
    println!("\n{}", msg);
    exit(code)
}

/// ## CLI Structs

#[derive(Parser)]
#[command(name = "StartGGElo")]
#[command(author = "Kiana Sheibani <kiana.a.sheibani@gmail.com>")]
#[command(version = "0.1.0")]
#[command(about = "StartGGElo - Elo rating calculator for start.gg tournaments", long_about = None)]
struct Cli {
    #[command(subcommand)]
    subcommand: Subcommands,

    #[arg(
        short = 'A',
        long = "auth",
        value_name = "TOKEN",
        global = true,
        help = "Authentication token",
        long_help = "The authentication token for accessing start.gg.
A token can be specified using this argument, in the environment variable
AUTH_TOKEN, or in a text file '<CONFIG_DIR>/auth.txt'."
    )]
    auth_token: Option<String>,

    #[arg(
        short,
        long = "config",
        value_name = "DIR",
        global = true,
        help = "Config directory",
        long_help = "This option overrides the default config directory.
If this directory does not exist, it will be created and a database file will
be initialized within it."
    )]
    config_dir: Option<PathBuf>,
}

#[derive(Subcommand)]
enum Subcommands {
    #[command(about = "Manipulate stored datasets")]
    Dataset {
        #[command(subcommand)]
        subcommand: DatasetSC,
    },
    #[command(
        about = "Sync player ratings",
        long_about = "Pull recent tournament data off of start.gg and use it to update each player's
stored ratings. This command will automatically keep track of the last time each
dataset was synced."
    )]
    Sync {
        #[arg(
            help = "The datasets to sync",
            long_help = "A list of datasets to sync.
If no datasets are given, then the dataset 'default' is synced. This dataset is
created if it does not already exist."
        )]
        datasets: Vec<String>,
        #[arg(short, long, help = "Sync all stored databases")]
        all: bool,
    },
}

#[derive(Subcommand)]
enum DatasetSC {
    #[command(about = "List datasets")]
    List,
    #[command(about = "Create a new dataset")]
    New { name: Option<String> },
    #[command(about = "Delete a dataset")]
    Delete { name: Option<String> },
}

fn main() {
    let cli = Cli::parse();

    match cli.subcommand {
        Subcommands::Dataset {
            subcommand: DatasetSC::List,
        } => dataset_list(),
        Subcommands::Dataset {
            subcommand: DatasetSC::New { name },
        } => dataset_new(name, cli.auth_token),
        Subcommands::Dataset {
            subcommand: DatasetSC::Delete { name },
        } => dataset_delete(name),

        Subcommands::Sync { datasets, all } => sync(datasets, all, cli.auth_token),
    }
}

fn dataset_list() {
    let config_dir = dirs::config_dir().expect("Could not determine config directory");

    let connection =
        open_datasets(&config_dir).unwrap_or_else(|_| error("Could not open datasets file", 1));
    let datasets = list_datasets(&connection).expect("Error communicating with SQLite");

    println!("{:?}", datasets);
}

fn read_string() -> String {
    let mut line = String::new();
    io::stdout()
        .flush()
        .unwrap_or_else(|_| error("Could not access stdout", 2));
    io::stdin()
        .read_line(&mut line)
        .unwrap_or_else(|_| error("Could not read from stdin", 2));
    line.trim().to_owned()
}

fn dataset_new(name: Option<String>, auth_token: Option<String>) {
    let config_dir = dirs::config_dir().expect("Could not determine config directory");

    let auth = auth_token
        .or_else(|| get_auth_token(&config_dir))
        .unwrap_or_else(|| error("Access token not provided", 1));

    let name = name.unwrap_or_else(|| {
        print!("Name of new dataset: ");
        read_string()
    });

    print!("Search games: ");
    let games = run_query::<VideogameSearch, _>(
        VideogameSearchVars {
            name: &read_string(),
        },
        &auth,
    )
    .unwrap_or_else(|| error("Could not access start.gg", 1));

    if games.is_empty() {
        issue("No games found!", 0);
    }

    println!("\nSearch results:");
    for (i, game) in games.iter().enumerate() {
        println!("{} - {}", i, game.name);
    }

    print!("\nGame to track ratings for (0-{}): ", games.len() - 1);
    let index = read_string()
        .parse::<usize>()
        .unwrap_or_else(|_| error("Not an integer", 1));
    if index >= games.len() {
        error("Out of range!", 1);
    }

    let game_id = games[index].id;

    let connection =
        open_datasets(&config_dir).unwrap_or_else(|_| error("Could not open datasets file", 1));
    new_dataset(
        &connection,
        &name,
        DatasetConfig {
            last_sync: Timestamp(1),
            game_id,
            state: None,
        },
    )
    .expect("Error communicating with SQLite");
}

fn dataset_delete(name: Option<String>) {
    let config_dir = dirs::config_dir().expect("Could not determine config directory");

    let name = name.unwrap_or_else(|| {
        print!("Dataset to delete: ");
        read_string()
    });

    let connection =
        open_datasets(&config_dir).unwrap_or_else(|_| error("Could not open datasets file", 1));
    delete_dataset(&connection, &name).expect("Error communicating with SQLite");
}

fn sync(datasets: Vec<String>, all: bool, auth_token: Option<String>) {
    let config_dir = dirs::config_dir().unwrap();

    let auth = auth_token
        .or_else(|| get_auth_token(&config_dir))
        .unwrap_or_else(|| error("Access token not provided", 1));

    let connection =
        open_datasets(&config_dir).unwrap_or_else(|_| error("Could not open datasets file", 1));

    #[allow(unused_must_use)]
    let datasets = if all {
        list_datasets(&connection).unwrap()
    } else if datasets.len() == 0 {
        print!("No datasets provided; create a new one? (y/n) ");
        if read_string() == "y" {
            dataset_new(Some(String::from("default")), Some(auth.clone()));
        }
        vec![String::from("default")]
    } else {
        datasets
    };

    for dataset in datasets {
        let dataset_config = get_dataset_config(&connection, &dataset)
            .expect("Error communicating with SQLite")
            .unwrap_or_else(|| error(&format!("Dataset {} does not exist!", dataset), 1));

        sync_dataset(&connection, &dataset, dataset_config, &auth).unwrap_or_else(|err| {
            connection.execute("ROLLBACK;").unwrap();
            panic!("{:?}", err);
            // error("Error communicating with SQLite", 2)
        });

        update_last_sync(&connection, &dataset).expect("Error communicating with SQLite");
    }
}