use serenity::{
    framework::standard::{macros::command, Args, CommandError, CommandResult},
    model::{channel::Message, id::ChannelId},
    prelude::*,
};

// Prints Nth pinned message
#[command]
fn pinned(ctx: &mut Context, message: &Message, mut args: Args) -> CommandResult {
    // defaults to latest pinned message if no args are provided
    let mut idx = args.single::<usize>().unwrap_or(1);
    // Makes pinned messages 1-indexed
    if idx != 0 {
        idx -= 1;
    }
    let target_channel = match args.single::<ChannelId>() {
        Ok(v) => v,
        Err(_) => message.channel_id,
    };
    let pinned = match target_channel.pins(&ctx.http) {
        Ok(v) => v,
        Err(e) => {
            return Err(CommandError(s!(format!(
                "Could not get pinned messages! Error: {}",
                e
            ))));
        }
    };
    if pinned.is_empty() {
        return Err(CommandError(s!("No pinned messages found!")));
    }
    if idx > pinned.len() - 1 {
        return Err(CommandError(s!("Index out of bounds!")));
    }

    let channel = match pinned[idx].channel(&ctx) {
        Some(g) => g,
        None => return Err(CommandError(s!("Could not get Channel"))),
    };

    let guild_arc = match channel.guild() {
        Some(a) => a,
        None => return Err(CommandError(s!("Could not find Guild Arc"))),
    };
    let guild = guild_arc.read();
    let guild_id = guild.guild_id;

    let msg_link = format!(
        "https://discordapp.com/channels/{}/{}/{}",
        guild_id, &pinned[idx].channel_id, &pinned[idx].id
    );

    let _ = message.channel_id.send_message(&ctx.http, |m| {
        m.embed(|e| {
            e.title(format!("Pinned message #{}", idx + 1))
                .description(&pinned[idx].content)
                .field("🔗 link", format!("[original message]({})", msg_link), true)
                .timestamp(&pinned[idx].timestamp);
            e.author(|a| {
                a.name(&pinned[idx].author.name)
                    .icon_url(&pinned[idx].author.avatar_url().unwrap())
            });
            e.colour(0xffd1dc);
            if !&pinned[idx].attachments.is_empty() {
                e.image(&pinned[idx].attachments[0].url);
            }

            e
        })
    });

    Ok(())
}