use reqwest::Url;
use serenity::all::{ActivityData, AutocompleteChoice, CommandOptionType, CreateAutocompleteResponse, CreateCommandOption, CreateInteractionResponse, CreateInteractionResponseMessage, EditMessage, GuildId, Interaction};
use serenity::async_trait;
use serenity::model::channel::Message;
use serenity::prelude::*;
use utils::{add_game, delete_game, format_games_list, parse_games_list};
use chrono::offset::FixedOffset;

pub mod config;
pub mod commands;
pub mod utils;


async fn send_to_telegram(msg: &str) {
    let base_url = format!("https://api.telegram.org/bot{}/sendMessage", config::CONFIG.telegram_bot_token);

    let url = Url::parse_with_params(
        base_url.as_ref(),
        &[
            ("chat_id", &config::CONFIG.telegram_channel_id.to_string().as_ref()),
            ("text", &msg)
        ]
    ).unwrap();

    reqwest::get(url).await.expect("Error sending message to Telegram");
}


struct Handler;

#[async_trait]
impl EventHandler for Handler {
    async fn interaction_create(&self, ctx: Context, interaction: Interaction) {
        if let Interaction::Command(command) = interaction {
            if command.channel_id != config::CONFIG.discord_game_list_channel_id {
                return;
            }

            match command.data.name.as_str() {
                "copy_message" => {
                    let message_id = command.data.options[0].value.as_str().unwrap().parse::<u64>().unwrap();
                    let message = command.channel_id.message(&ctx.http, message_id).await.unwrap();

                    let data = CreateInteractionResponseMessage::new().content(message.content);
                    let builder = CreateInteractionResponse::Message(data);
                    if let Err(why) = command.create_response(&ctx.http, builder).await {
                        println!("Cannot respond to slash command: {why}");
                    }
                },
                "add" => {
                    let mut message = command.channel_id.message(&ctx.http, config::CONFIG.discord_game_list_message_id).await.unwrap();

                    let utc_offset = FixedOffset::east_opt(3 * 3600); // UTC+3 offset in seconds
                    let current_time = chrono::Local::now().with_timezone(&utc_offset.unwrap());

                    let mut categories = parse_games_list(&message.content).await;

                    categories = add_game(
                        categories,
                        command.data.options[0].value.as_str().unwrap(),
                        &format!(
                            "* {} ({}) | {}",
                            command.data.options[2].value.as_str().unwrap(),
                            command.data.options[1].value.as_str().unwrap(),
                            match command.data.options.get(3) {
                                Some(v) => v.value.as_str().unwrap().to_string(),
                                None => format!("{}", current_time.format("%d.%m.%Y")),
                            },
                        )
                    ).await;

                    let new_content = format_games_list(categories).await;

                    message.edit(&ctx.http, EditMessage::new().content(new_content)).await.unwrap();

                    let data = CreateInteractionResponseMessage::new().content("Игра добавлена!").ephemeral(true);
                    let builder = CreateInteractionResponse::Message(data);
                    if let Err(why) = command.create_response(&ctx.http, builder).await {
                        println!("Cannot respond to slash command: {why}");
                    }
                },
                "delete" => {
                    let mut message = command.channel_id.message(&ctx.http, config::CONFIG.discord_game_list_message_id).await.unwrap();

                    let mut categories = parse_games_list(&message.content).await;

                    categories = delete_game(
                        categories,
                        command.data.options[0].value.as_str().unwrap()
                    ).await;

                    let new_content = format_games_list(categories).await;

                    message.edit(&ctx.http, EditMessage::new().content(new_content)).await.unwrap();

                    let data = CreateInteractionResponseMessage::new().content("Игра удалена!").ephemeral(true);
                    let builder = CreateInteractionResponse::Message(data);
                    if let Err(why) = command.create_response(&ctx.http, builder).await {
                        println!("Cannot respond to slash command: {why}");
                    }
                },
                _ => (),
            };
        } else if let Interaction::Autocomplete(interaction) = interaction {
            if interaction.channel_id != config::CONFIG.discord_game_list_channel_id {
                return;
            }

            println!("Received autocomplete interaction: {interaction:#?}");

            match interaction.data.name.as_str() {
                "game" => {
                    let message = interaction.channel_id.message(&ctx.http, config::CONFIG.discord_game_list_message_id).await.unwrap();
                    let categories = parse_games_list(&message.content).await;
                    let games = categories.iter().flat_map(|category| category.games.iter()).collect::<Vec<&String>>();

                    let autocompolete_response = CreateAutocompleteResponse::new().set_choices(
                        games.iter().map(|game| {
                            AutocompleteChoice::new(game.to_string(), game.to_string())
                        }).collect()
                    );

                    let _ = interaction.create_response(&ctx.http, serenity::builder::CreateInteractionResponse::Autocomplete(autocompolete_response)).await.unwrap();
                },
                _ => (),
            };
        }
    }

    async fn message(&self, _ctx: Context, msg: Message) {
        if msg.guild_id != Some(config::CONFIG.discord_guild_id.into()) {
            return;
        }

        if msg.channel_id == config::CONFIG.discord_channel_id {
            send_to_telegram(&msg.content).await;
            return;
        }
    }

    async fn ready(&self, ctx: Context, _ready: serenity::model::gateway::Ready) {
        let guild_id = GuildId::new(config::CONFIG.discord_guild_id);

        let _ = guild_id
            .set_commands(
                &ctx.http,
                vec![
                    commands::add_game::register(),
                    commands::delete_game::register(),
                    commands::copy_message::register(),
                ]
            ).await.unwrap();
    }
}


#[tokio::main]
async fn main() {
    let intents = GatewayIntents::GUILD_MESSAGES
        | GatewayIntents::DIRECT_MESSAGES
        | GatewayIntents::MESSAGE_CONTENT;

    let mut client =
        Client::builder(&config::CONFIG.discord_bot_token, intents)
            .event_handler(Handler)
            .status(serenity::all::OnlineStatus::Online)
            .activity(ActivityData::playing(&config::CONFIG.discord_bot_activity))
            .await
            .expect("Err creating client");

    if let Err(why) = client.start().await {
        println!("Client error: {why:?}");
    }
}