use serenity::all::{CommandInteraction, Context};
use skynet_discord_bot::{
  common::{
    database::DataBase,
    server_icon::{get_config_icons, update_icon::update_icon_main, ServerIcons},
  },
  Config,
};

use serenity::all::{CommandOptionType, CreateCommand, CreateCommandOption};

// commands that server mods are able to use
pub(crate) mod admin {
  use super::*;

  // Moderators can force a icon change
  pub(crate) mod change {
    use super::*;

    pub async fn run(_command: &CommandInteraction, ctx: &Context) -> String {
      let db_lock = {
        let data_read = ctx.data.read().await;
        data_read.get::<DataBase>().expect("Expected Databse in TypeMap.").clone()
      };
      let db = db_lock.read().await;

      let config_lock = {
        let data_read = ctx.data.read().await;
        data_read.get::<Config>().expect("Expected Config in TypeMap.").clone()
      };
      let config_global = config_lock.read().await;

      let config_toml = get_config_icons::minimal();
      update_icon_main(ctx, &db, &config_global, &config_toml).await;

      "Changed server Icon".to_string()
    }
  }
}

// commands for general users
pub(crate) mod user {
  use super::*;
  use skynet_discord_bot::common::server_icon::get_config_icons::ConfigTomlLocal;

  pub fn register() -> CreateCommand {
    CreateCommand::new("icon")
      .description("Commands related to the Server Icon")
      .add_option(
        CreateCommandOption::new(CommandOptionType::SubCommandGroup, "current", "Information on current items.")
          .add_sub_option(CreateCommandOption::new(CommandOptionType::SubCommand, "icon", "Information on current icon."))
          .add_sub_option(CreateCommandOption::new(CommandOptionType::SubCommand, "festival", "Information on current festival.")),
      )
      .add_option(CreateCommandOption::new(CommandOptionType::SubCommand, "stats", "How many times the particular icon has been used"))
  }

  fn get_logo_url(config_toml: &ConfigTomlLocal, logo_name: &str) -> String {
    format!("{}/src/branch/main/{}/{}", &config_toml.source.repo, &config_toml.source.directory, logo_name)
  }

  /// Regular users can get teh link to teh current icon
  pub(crate) mod current {
    use super::*;

    pub(crate) mod icon {
      use super::*;
      use serenity::all::{CreateAttachment, EditInteractionResponse};

      use sqlx::{Pool, Sqlite};

      pub async fn run(command: &CommandInteraction, ctx: &Context) -> String {
        let db_lock = {
          let data_read = ctx.data.read().await;
          data_read.get::<DataBase>().expect("Expected Databse in TypeMap.").clone()
        };
        let db = db_lock.read().await;

        let config_toml = get_config_icons::minimal();

        if let Some(logo) = get_current_icon(&db).await {
          if let Ok(attachment) = CreateAttachment::path(&logo.path).await {
            match command.edit_response(&ctx.http, EditInteractionResponse::new().new_attachment(attachment)).await {
              Ok(_) => {}
              Err(e) => {
                dbg!(e);
              }
            }
          }

          format!("[{}]({})", &logo.name, get_logo_url(&config_toml, &logo.name))
        } else {
          "Could not find current icon".to_string()
        }
      }

      async fn get_current_icon(db: &Pool<Sqlite>) -> Option<ServerIcons> {
        match sqlx::query_as::<_, ServerIcons>(
          "
              SELECT * from server_icons ORDER BY id DESC LIMIT 1
              ",
        )
        .fetch_one(db)
        .await
        {
          Ok(res) => Some(res),
          Err(e) => {
            dbg!(e);
            None
          }
        }
      }
    }

    pub(crate) mod festival {
      use serenity::all::{CommandInteraction, Context};
      use skynet_discord_bot::common::server_icon::{get_config_icons, update_icon::get_festival};
      use skynet_discord_bot::Config;

      // use this to return what current festivals are active?
      pub async fn run(_command: &CommandInteraction, ctx: &Context) -> String {
        let config_lock = {
          let data_read = ctx.data.read().await;
          data_read.get::<Config>().expect("Expected Config in TypeMap.").clone()
        };
        let config = config_lock.read().await;

        let config_toml = get_config_icons::full(&config);

        let response = get_festival(&config_toml).current;

        if response.is_empty() {
          "No festival currently active".to_string()
        } else {
          format!("Festivals active: {}", response.join(", "))
        }
      }
    }
  }

  /// Get the statistics of the icons
  pub(crate) mod stats {
    use super::*;
    use sqlx::{Pool, Sqlite};

    pub async fn run(_command: &CommandInteraction, ctx: &Context) -> String {
      let db_lock = {
        let data_read = ctx.data.read().await;
        data_read.get::<DataBase>().expect("Expected Databse in TypeMap.").clone()
      };
      let db = db_lock.read().await;

      let config_toml = get_config_icons::minimal();

      let totals = get_totals(&db).await;

      fmt_msg(&config_toml, &totals)
    }

    #[derive(Debug, Clone, sqlx::FromRow)]
    pub struct CountResult {
      pub name: String,
      pub times: i64,
    }

    async fn get_totals(db: &Pool<Sqlite>) -> Vec<CountResult> {
      sqlx::query_as::<_, CountResult>(
        "
            SELECT
                DISTINCT name,
                         COUNT(*) OVER(PARTITION BY name) AS times
            FROM server_icons
            ",
      )
      .fetch_all(db)
      .await
      .unwrap_or_else(|e| {
        dbg!(e);
        vec![]
      })
    }

    fn fmt_msg(config_toml: &ConfigTomlLocal, totals: &[CountResult]) -> String {
      let mut totals_local = totals.to_owned();
      totals_local.sort_by_key(|x| x.times);
      totals_local.reverse();

      // msg can be a max 2000 chars long
      let mut limit = 2000 - 3;

      let mut response = vec![];
      for CountResult {
        name,
        times,
      } in &totals_local
      {
        let current_leading = if times < &10 {
          "00"
        } else if times < &100 {
          "0"
        } else {
          ""
        };

        let url = get_logo_url(config_toml, name);

        // the `` is so that the numbers will be rendered in monospaced font
        // the <> is to suppress the URL embed
        let line = format!("``{}{}`` [{}](<{}>)", current_leading, times, name, url);

        let length = line.len() + 1;

        // +3 is to account for the closing fense
        if length < (limit + 3) {
          response.push(line);
          limit -= length;
        } else {
          break;
        }
      }

      response.join("\n")
    }
  }
}