#[macro_use] extern crate log;
#[macro_use] extern crate serde;

use std::env;
use std::ops::Deref;
use std::path::PathBuf;
use std::sync::Arc;

use clap::ArgMatches;
use diesel::r2d2::ConnectionManager;
use diesel::sqlite::Sqlite;
use diesel::SqliteConnection;
use diesel_migrations::{embed_migrations, EmbeddedMigrations, MigrationHarness};
use poise::framework::FrameworkBuilder;
use poise::serenity_prelude::*;

use crate::config::ManifoldConfig;
use crate::error::{ManifoldError, ManifoldResult};
use crate::events::Handler;
use crate::models::user::{ManifoldUserInfo, UserInfo};
use crate::responses::Responses;

pub mod config;
pub mod error;
pub mod events;
pub mod responses;
pub mod commands;
pub mod models;
pub mod schema;

pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!("migrations");

// Retrieve build info from output file
pub mod built_info {
    include!(concat!(env!("OUT_DIR"), "/built.rs"));
}

pub type ManifoldDatabasePool = r2d2::Pool<ConnectionManager<SqliteConnection>>;

pub struct Db {
    pub pool: ManifoldDatabasePool,
}

impl Deref for Db {
    type Target = ManifoldDatabasePool;

    fn deref(&self) -> &Self::Target { &self.pool }
}

pub struct ManifoldDatabase;

pub struct ManifoldData(pub Arc<ManifoldDataInner>);

impl Deref for ManifoldData {
    type Target = ManifoldDataInner;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

pub struct ManifoldDataInner {
    bot_config: ManifoldConfig,
    database: Db,
    responses: Responses,
    user_info: Mutex<ManifoldUserInfo>,
    version_string: String,
}

pub type ManifoldContext<'a> = poise::Context<'a, ManifoldData, ManifoldError>;
pub type ManifoldCommand = poise::Command<ManifoldData, ManifoldError>;

pub async fn prepare_client(arguments: ArgMatches, intents: GatewayIntents, injected_commands: Vec<ManifoldCommand>, caller_version_string: String) -> ManifoldResult<FrameworkBuilder<ManifoldData, ManifoldError>> {
    let bot_environment = arguments.get_one("environment").unwrap();
    let config_file = format!("config/{}", arguments.get_one::<String>("config-file").unwrap());

    info!("Reading configuration...");
    debug!("Configuration file path: {}", &config_file);
    let config = ManifoldConfig::load_config(&config_file, bot_environment).expect(&*format!("Could not read configuration file {}", &config_file));

    let prefix = config.get_value(&"BotPrefix".to_string()).expect("Could not read bot_prefix from config.");

    let manager = ConnectionManager::<SqliteConnection>::new("manifold.db");
    let pool = r2d2::Pool::builder()
        .max_size(1)
        .build(manager)
        .expect("Database setup error!");

    let mut responses = Responses::new();
    responses.reload(&PathBuf::from(config.get_value(&"ResponsesFilePath".to_string()).unwrap_or("txt/responses.txt".to_string()))).expect("Could not load responses file!");

    let token = env::var("DISCORD_TOKEN").expect(
        "Could not find an environment variable called DISCORD_TOKEN",
    );

    let framework = poise::Framework::builder()
        .options(poise::FrameworkOptions {
            event_handler: |ctx, e, fctx, _| Box::pin(async move {
                Handler::listen(ctx, fctx, e).await
            }),
            pre_command: |ctx: ManifoldContext<'_>| Box::pin(async move {
                info!("Received command {} from {}", ctx.command().name, ctx.author().name);
                let config = &ctx.data().bot_config;
                let log_channel = config.get_channel(&"Log".to_string()).unwrap();
                let _ = log_channel.say(ctx, format!("Received command {} from {}", ctx.command().name, ctx.author().name)).await;
            }),
            commands: commands::collect_commands(injected_commands),
            prefix_options: poise::PrefixFrameworkOptions {
                prefix: Some(prefix),
                ..Default::default()
            },
            ..Default::default()
        })
        .token(token)
        .intents(intents)
        .setup(|ctx, _ready, framework| {
            Box::pin(async move {
                poise::builtins::register_globally(ctx, &framework.options().commands).await?;
                ctx.set_activity(Activity::watching("you")).await;
                let db = Db { pool };
                apply_migrations(&mut db.get()?);
                let user_info = UserInfo::load(&db).expect("Could not load user info, rejecting");
                let git_info: String = built_info::GIT_VERSION.unwrap_or("unknown").to_string();
                Ok(ManifoldData(Arc::new(ManifoldDataInner {
                    bot_config: config,
                    database: db,
                    responses,
                    user_info: Mutex::new(user_info),
                    version_string: format!("{caller} (Manifold framework version {mfold_ver} built at {mfold_time} from revision {mfold_rev})", caller=caller_version_string, mfold_ver=built_info::PKG_VERSION, mfold_time=built_info::BUILT_TIME_UTC, mfold_rev=git_info),
                })))
            })
        });

    Ok(framework)
}

fn apply_migrations(conn: &mut impl MigrationHarness<Sqlite>) {

    conn.run_pending_migrations(MIGRATIONS)
        .expect("An error occurred applying migrations.");
}