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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::token::{self, Token, TokenAccount, Transfer};

use crate::{events::TransferPosition, MarginAccount, SignerSeeds};

#[derive(Accounts)]
pub struct AdminTransferPosition<'info> {
    /// The administrative authority
    #[account(address = super::ADMINISTRATOR)]
    pub authority: Signer<'info>,

    /// The target margin account to move a position into
    #[account(mut)]
    pub target_account: AccountLoader<'info, MarginAccount>,

    /// The source account to move a position out of
    #[account(mut)]
    pub source_account: AccountLoader<'info, MarginAccount>,

    /// The token account to be moved from
    #[account(mut)]
    pub source_token_account: Account<'info, TokenAccount>,

    /// The token account to be moved into
    #[account(mut)]
    pub target_token_account: Account<'info, TokenAccount>,

    pub token_program: Program<'info, Token>,
}

impl<'info> AdminTransferPosition<'info> {
    fn transfer_context(&self) -> CpiContext<'_, '_, '_, 'info, Transfer<'info>> {
        CpiContext::new(
            self.token_program.to_account_info(),
            Transfer {
                from: self.source_token_account.to_account_info(),
                to: self.target_token_account.to_account_info(),
                authority: self.source_account.to_account_info(),
            },
        )
    }
}

pub fn admin_transfer_position_handler(
    ctx: Context<AdminTransferPosition>,
    amount: u64,
) -> Result<()> {
    let source_seeds = ctx.accounts.source_account.load()?.signer_seeds_owned();

    token::transfer(
        ctx.accounts
            .transfer_context()
            .with_signer(&[&source_seeds.signer_seeds()]),
        amount,
    )?;

    let source_tokens = &mut ctx.accounts.source_token_account;
    let target_tokens = &mut ctx.accounts.target_token_account;

    source_tokens.reload()?;
    target_tokens.reload()?;

    let mut source = ctx.accounts.source_account.load_mut()?;
    let mut target = ctx.accounts.target_account.load_mut()?;

    source.set_position_balance(
        &source_tokens.mint,
        &source_tokens.key(),
        source_tokens.amount,
    )?;
    target.set_position_balance(
        &target_tokens.mint,
        &target_tokens.key(),
        target_tokens.amount,
    )?;

    emit!(TransferPosition {
        source_margin_account: ctx.accounts.source_account.key(),
        target_margin_account: ctx.accounts.target_account.key(),
        source_token_account: ctx.accounts.source_token_account.key(),
        target_token_account: ctx.accounts.target_token_account.key(),
        amount
    });

    Ok(())
}