use poise::serenity_prelude::{Attachment, ComponentInteractionCollector, CreateActionRow, CreateAttachment, CreateButton, CreateMessage, EditMessage};
use squad_quest::SquadObject;

use crate::{Context, Error, account::fetch_or_init_account, commands::guild};

/// Send an answer to the quest for review
#[poise::command(
    prefix_command,
    slash_command,
    guild_only,
    check = "guild",
    name_localized("ru", "ответить"),
    description_localized("ru", "Отправить ответ на квест на проверку"),
)]
pub async fn answer(
    ctx: Context<'_>,
    #[description = "Identifier of the quest to answer to"]
    #[name_localized("ru", "ид_квеста")]
    #[description_localized("ru", "Идентификатор квеста для ответа")]
    quest_id: u16,
    #[description = "Text answer to the quest"]
    #[name_localized("ru", "текст")]
    #[description_localized("ru", "Текст ответа на квест")]
    text: Option<String>,
    #[description = "Attachment answer to the quest"]
    #[name_localized("ru", "файл1")]
    #[description_localized("ru", "Вложение к ответу на квест")]
    file1: Option<Attachment>,
    #[description = "Attachment answer to the quest"]
    #[name_localized("ru", "файл2")]
    #[description_localized("ru", "Вложение к ответу на квест")]
    file2: Option<Attachment>,
    #[description = "Attachment answer to the quest"]
    #[name_localized("ru", "файл3")]
    #[description_localized("ru", "Вложение к ответу на квест")]
    file3: Option<Attachment>,
) -> Result<(), Error> {
    let mut account = fetch_or_init_account(&ctx.data().config, ctx.author().id.to_string(), Some(ctx.author()));

    if let Some(_) = account.quests_completed.iter().find(|qid| **qid == quest_id) {
        return Err(Error::QuestIsCompleted(quest_id));
    }

    let quests = ctx.data().config.load_quests();
    let Some(quest) = quests.iter()
        .filter(|q| q.public)
        .find(|q| q.id == quest_id) else {
        return Err(Error::QuestNotFound(quest_id));
    };
 
    let mut files: Vec<Attachment> = Vec::new();
    for file in [file1, file2, file3] {
        if let Some(f) = file {
            files.push(f);
        }
    }

    if text.is_none() && files.len() == 0 {
        return Err(Error::NoContent);
    }

    let strings = &ctx.data().strings;
    let mut formatter = strings.formatter()
        .user(ctx.author())
        .quest(quest);

   let text_ans = match text {
        Some(text) => {
            formatter = formatter.text(text);
            formatter.fmt(&strings.answer.text)
        },
        None => String::new(),
    };

    let attachment_notice = if files.len() == 0 { String::new() } else {
        formatter.fmt(&strings.answer.attachment_notice)
    };

    let content = [
        formatter.fmt(&strings.answer.from),
        formatter.fmt(&strings.answer.quest),
        formatter.fmt(&strings.answer.expected),
        text_ans,
        attachment_notice,
    ].join("");
    
    let mut attachments: Vec<CreateAttachment> = Vec::new();

    for file in files {
        let attachment = CreateAttachment::url(ctx, &file.url).await?;
        attachments.push(attachment);
    }
    
    let ctx_id = ctx.id();
    let approve_id = format!("{ctx_id}approve");
    let reject_id = format!("{ctx_id}reject");

    let components = CreateActionRow::Buttons(vec![
        CreateButton::new(&approve_id).label("Approve".to_string()),
        CreateButton::new(&reject_id).label("Reject".to_string()),
    ]);

    let ans_channel = {
        let discord = ctx.data().discord.clone();
        let guard = discord.lock().expect("should not be locked");
        guard.answers_channel
    };
    let builder = CreateMessage::new()
        .content(content.clone())
        .files(attachments)
        .components(vec![components]);

    let mut message = ans_channel.send_message(ctx, builder).await?;

    let reply_string = formatter.fmt(&strings.answer.reply.initial);
    ctx.reply(reply_string).await?;

    if let Some(press) = ComponentInteractionCollector::new(ctx)
        .filter(move |press| press.data.custom_id.starts_with(&ctx_id.to_string()))
        .await
    {
        let admin = press.user;
        formatter = formatter.user(&admin).text(&content);

        let is_approved = press.data.custom_id == approve_id;
        let content = if is_approved {
            formatter.fmt(&strings.answer.accepted_by)
        } else {
            formatter.fmt(&strings.answer.rejected_by)
        };

        let builder = EditMessage::new().content(content).components(Vec::new());
        message.edit(ctx, builder).await?;

        let content: String;
        if is_approved {
            let mut no_errors = true;
            if let Err(error) = quest.complete_for_account(&mut account) {
                eprintln!("{error}");
                no_errors = false;
            };
            let path = ctx.data().config.full_accounts_path();
            if let Err(error) = account.save(path) {
                eprintln!("{error}");
                no_errors = false;
            };

            formatter = formatter.current_balance(&account);

            if no_errors {
                content = formatter.fmt(&strings.answer.reply.accepted);
            } else {
                content = formatter.fmt(&strings.answer.reply.error);
            }
        } else {
            content = formatter.fmt(&strings.answer.reply.rejected);
        };
        let dm_builder = CreateMessage::new().content(content);
        ctx.author().dm(ctx, dm_builder).await?;
    }

    Ok(())
}