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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 anchor_spl::{
    associated_token::AssociatedToken,
    token::{Mint, Token, TokenAccount},
};

use crate::{events, util::Require, Approver, MarginAccount, TokenConfig};

#[derive(Accounts)]
pub struct CreateDepositPosition<'info> {
    /// The authority that can change the margin account
    pub authority: Signer<'info>,

    /// The address paying for rent
    #[account(mut)]
    pub payer: Signer<'info>,

    /// The margin account to register this deposit account with
    #[account(mut)]
    pub margin_account: AccountLoader<'info, MarginAccount>,

    /// The mint for the token being stored in this account
    pub mint: Account<'info, Mint>,

    /// The margin config for the token
    #[account(has_one = mint)]
    pub config: Account<'info, TokenConfig>,

    /// The token account to store deposits
    #[account(associated_token::mint = mint,
              associated_token::authority = margin_account
    )]
    pub token_account: Account<'info, TokenAccount>,

    pub associated_token_program: Program<'info, AssociatedToken>,
    pub token_program: Program<'info, Token>,
    pub rent: Sysvar<'info, Rent>,
    pub system_program: Program<'info, System>,
}

pub fn create_deposit_position_handler(ctx: Context<CreateDepositPosition>) -> Result<()> {
    let config = &ctx.accounts.config;
    let mut account = ctx.accounts.margin_account.load_mut()?;
    let position_token = &ctx.accounts.mint;
    let address = ctx.accounts.token_account.key();
    account.verify_authority(ctx.accounts.authority.key())?;

    let key = account.register_position(
        position_token.key(),
        position_token.decimals,
        address,
        config.adapter_program().unwrap_or_default(),
        config.token_kind,
        config.value_modifier,
        config.max_staleness,
        &[Approver::MarginAccountAuthority],
    )?;

    let position = account.get_position_by_key(&key).require()?;

    emit!(events::PositionRegistered {
        margin_account: ctx.accounts.margin_account.key(),
        authority: ctx.accounts.authority.key(),
        position: *position,
    });

    Ok(())
}