Momentum-Apps/pokemon_data.h

#ifndef POKEMON_DATA_H
#define POKEMON_DATA_H

#pragma once

/* The struct is laid out exactly as the data trasfer that gets sent for trade
 * information. It has to be packed in order to not have padding in the Flipper.
 * Packing is always potentially filled with pitfalls, however this has worked
 * in testing without issue and this code isn't meant to be portable.
 */

/* NOTE: These are all opposite endianness on the flipper than they are in the
 * GB/Z80. e.g. a uint16_t value of 0x2c01 translates to 0x012c.
 * Need to use __builtin_bswap16(val) to switch between Flipper and Pokemon.
 */
/* This is 44 bytes in memory */
struct __attribute__((__packed__)) pokemon_structure {
    uint8_t index;
    uint16_t hp; // Calculated from level
    /* Level is normally calculated from exp, however, level is more human
     * readable/digestable compared to exp. Therefore, we set legel and then
     * from that calculate, (Max)HP, ATK, DEF, SPD, SPC.
     */
    uint8_t level;
    uint8_t status_condition; // Do you really want to trade a Poisoned pokemon?
    uint8_t type[2]; // Pokemon with a single type just repeat the type twice
    uint8_t catch_held; // Unsure if this has any effect in Gen 1
    uint8_t move[4];
    uint16_t ot_id;
    uint8_t exp[3]; // Calculated from level
    uint16_t hp_ev;
    uint16_t atk_ev;
    uint16_t def_ev;
    uint16_t spd_ev;
    uint16_t special_ev;
    uint16_t iv;
    uint8_t move_pp[4];
    uint8_t level_again; // Copy of level
    uint16_t max_hp; // Calculated from level
    uint16_t atk; // Calculated from level
    uint16_t def; // Calculated from level
    uint16_t spd; // Calculated from level
    uint16_t special; // Calculated from level
};

struct __attribute__((__packed__)) name {
    /* Reused a few times, but in Gen I, all name strings are 11 bytes in memory.
     * At most, 10 symbols and a TERM_ byte.
     * Note that some strings must be shorter than 11.
     */
    unsigned char str[11];
};

/* This is 415 bytes in memory/transmitted */
struct __attribute__((__packed__)) trade_data_block {
    /* TODO: Change this to use struct name above */
    unsigned char trainer_name[11];
    uint8_t party_cnt;
    /* Only the first pokemon is ever used even though there are 7 bytes here.
     * If the remaining 6 bytes are _not_ 0xff, then the trade window renders
     * garbage for the Flipper's party.
     */
    uint8_t party_members[7];
    /* Only the first pokemon is set up, even though there are 6 total party members */
    struct pokemon_structure party[6];
    /* Only the first pokemon has an OT name and nickname even though there are 6 members */
    /* OT name should not exceed 7 chars! */
    struct name ot_name[6];
    struct name nickname[6];
};

typedef struct trade_data_block TradeBlock;

#endif /* POKEMON_DATA_H */