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// SPDX-License-Identifier: AGPL-3.0-or-later
//
// Copyright (C) 2022 JET PROTOCOL HOLDINGS, LLC.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use anchor_lang::prelude::*;
use std::convert::TryInto;

use crate::{ErrorCode, MarginAccount, PriceChangeInfo, TokenConfig, TokenOracle};

#[derive(Accounts)]
pub struct RefreshDepositPosition<'info> {
    /// The account to update
    #[account(mut)]
    pub margin_account: AccountLoader<'info, MarginAccount>,

    /// The margin config for the token
    pub config: Account<'info, TokenConfig>,

    /// The oracle for the token
    pub price_oracle: AccountInfo<'info>,
}

pub fn refresh_deposit_position_handler(ctx: Context<RefreshDepositPosition>) -> Result<()> {
    let mut margin_account = ctx.accounts.margin_account.load_mut()?;
    let config = &ctx.accounts.config;

    match config.oracle() {
        Some(TokenOracle::Pyth { price, .. }) => {
            let price_oracle_key = ctx.accounts.price_oracle.key();
            if price_oracle_key != price {
                msg!("expected oracle {} but got {}", price, price_oracle_key);
                return err!(ErrorCode::InvalidOracle);
            }

            let price_feed = match pyth_sdk_solana::load_price_feed_from_account_info(
                &ctx.accounts.price_oracle,
            ) {
                Ok(pf) => pf,
                Err(e) => {
                    msg!("the oracle account is not valid: {:?}", e);
                    return err!(ErrorCode::InvalidOracle);
                }
            };

            let price_obj = price_feed.get_current_price().ok_or_else(|| {
                msg!("current pyth price is invalid");
                ErrorCode::InvalidOracle
            })?;
            let ema_obj = price_feed.get_ema_price().ok_or_else(|| {
                msg!("current pyth ema price is invalid");
                ErrorCode::InvalidOracle
            })?;

            let price_info = PriceChangeInfo {
                value: price_obj.price,
                confidence: price_obj.conf,
                twap: ema_obj.price,
                exponent: price_obj.expo,
                publish_time: price_feed.publish_time,
            };

            let position = margin_account.get_position_mut(&config.mint).unwrap();
            position.set_price(&price_info.try_into()?)?;
        }

        None => {
            return err!(ErrorCode::InvalidOracle);
        }
    }

    Ok(())
}