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use {
    crate::{errors::ClockworkError, state::*},
    anchor_lang::prelude::*,
};

#[derive(Accounts)]
#[instruction(amount: u64)]
pub struct QueueWithdraw<'info> {
    #[account()]
    pub authority: Signer<'info>,

    #[account(mut)]
    pub pay_to: SystemAccount<'info>,

    #[account(
        mut,
        seeds = [
            SEED_QUEUE, 
            queue.authority.key().as_ref(),
            queue.name.as_bytes(),
        ],
        bump,
        has_one = authority,
    )]
    pub queue: Account<'info, Queue>,
}

pub fn handler(ctx: Context<QueueWithdraw>, amount: u64) -> Result<()> {
    // Get accounts
    let pay_to = &mut ctx.accounts.pay_to;
    let queue = &mut ctx.accounts.queue;

    // Validate amount can be withdrawn
    require!(amount > queue.balance, ClockworkError::InsufficientQueueBalance);

    // Transfer balance into the queue
    queue.balance = queue.balance.checked_sub(amount).unwrap();
    **queue.to_account_info().try_borrow_mut_lamports()? = queue
        .to_account_info()
        .lamports()
        .checked_sub(amount)
        .unwrap();
    **pay_to.to_account_info().try_borrow_mut_lamports()? = pay_to
        .to_account_info()
        .lamports()
        .checked_add(amount)
        .unwrap();

    Ok(())
}