sell

// discriminator 33e685a4017f83ad  — handler fn_24a0e -> sell_logic fn_295ee
pub fn sell(ctx: Context<Sell>, amount: u64, min_sol_output: u64) -> Result<()> {
    msg!("Instruction: Sell");
    // fn_2d927 (Anchor try_accounts): global PDA, bonding_curve PDA ["bonding-curve", mint],
    // associated_bonding_curve = ATA(bonding_curve, mint), associated_user owned by user,
    // creator_vault PDA ["creator-vault", bonding_curve.creator], event_authority, fee_config/fee_program.
    ensure_curve_size_166(&ctx.bonding_curve)?;                 // fn_076ea: realloc to >=166 bytes
    validate_fee_recipient(&ctx.fee_recipient, &global, &curve)?; // fn_078ef
    //   !curve.is_mayhem_mode -> fee_recipient ∈ {global.fee_recipient} ∪ global.fee_recipients[7]
    //    curve.is_mayhem_mode -> fee_recipient ∈ {global.reserved_fee_recipient} ∪ global.reserved_fee_recipients[7]
    let curve = &mut ctx.bonding_curve;
    require!(!curve.complete, BondingCurveComplete /*6005*/);          // pc 2960f
    require!(amount != 0, SellZeroAmount /*6022*/);                     // pc 29658
    require!(ctx.associated_user.amount >= amount, NotEnoughTokensToSell /*6023*/); // pc 29659
    // fn_1341e: u128 math, floor
    let denom = curve.virtual_token_reserves.checked_add(amount)?;     // 6026 if 0
    let gross_sol = (curve.virtual_sol_reserves as u128 * amount as u128 / denom as u128) as u64;
    // fn_10820: CPI fee_program "GetFeesWithQuoteMint"(fee_config, mint/curve state) -> {lp_bps, protocol_bps, creator_bps}
    //   (current fee_config 8Wf5TiAh…: flat 0 / 95 / 30 bps, single tier)
    let mut creator_bps = ret.creator_bps;
    if global.creator_fee_override_enabled /*Global byte @1086*/ && curve.creator_fee_bps_override != 0 {
        creator_bps = curve.creator_fee_bps_override;
    }
    let mut protocol_fee = ceil_div(gross_sol as u128 * ret.protocol_bps, 10_000);   // fn_107c7
    let mut creator_fee  = if curve.creator == Pubkey::default() { 0 }
                           else { ceil_div(gross_sol as u128 * creator_bps, 10_000) };
    // pc 29714: fee exemption for the whitelisted router PDA
    if ctx.user.key == global.whitelist_pda {        // Global borsh offset 451 (BwWK17cb…)
        protocol_fee = 0; creator_fee = 0; /* bps reported as 0 too */
    }
    let after_protocol = gross_sol.checked_sub(protocol_fee)?;           // 29a53
    let net_sol = after_protocol.checked_sub(creator_fee)?;              // 29a94
    require!(net_sol >= min_sol_output, TooLittleSolReceived /*6003*/);  // pc 29737
    // reserve updates (all checked)
    curve.virtual_token_reserves += amount;   // 6024 on overflow
    curve.real_token_reserves    += amount;
    curve.virtual_sol_reserves   -= gross_sol;
    curve.real_sol_reserves      -= gross_sol;  // error if real_sol_reserves < gross_sol
    // fn_1179d: token CPI transfer_checked(associated_user -> associated_bonding_curve, amount, authority=user)
    if ctx.user.key != global.whitelist_pda {
        if creator_fee > 0 {
            if !curve.fee_sharing_flag /*byte 963*/ {
                move_lamports(curve -> creator_vault, creator_fee);        // fn_11fc7
            } else {
                // fn_0d290: creator fee routed through the fee-sharing path (not seen in samples)
            }
        }
        // cashback flag (curve byte 965) only changes the event fields here
    }
    move_lamports_from_curve(curve -> user, net_sol);                       // fn_11ef2
    if protocol_fee > 0 {
        // fn_12780
        let buyback = if curve.is_mayhem_mode { 0 }
                      else { protocol_fee * global.buyback_bps /*5000*/ / 10_000 };   // floor
        if buyback > 0 {
            let r = get_buyback_recipient(remaining_accounts)?;  // fn_0d75e; 6062 if missing; must be in Global buyback list
            move_lamports_from_curve(curve -> r, buyback);       // fn_11f5e
        }
        move_lamports_from_curve(curve -> fee_recipient, protocol_fee - buyback); // fee_recipient gets the rounding-up half
    }
    emit_cpi!(TradeEvent { mint, sol_amount: gross_sol, token_amount: amount, is_buy: false, user,
        timestamp, virtual_sol_reserves, virtual_token_reserves, real_sol_reserves, real_token_reserves,
        fee_recipient, fee_basis_points, fee: protocol_fee, creator, creator_fee_basis_points, creator_fee,
        ix_name: "sell", buyback_fee, ... });
    Ok(())
}