source_of_the_sovereign/src/battle_engine/battle_help.c

#include <battle_help.h>

//from kds emerald battle engine upgrade

u8 type_effectiveness_table[TYPE_FAIRY - 0x4][TYPE_FAIRY - 0x4] = {
    {10, 10, 10, 10, 10, 05, 10, 00, 05, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10}, //normal
    {20, 10, 05, 05, 10, 20, 05, 00, 20, 10, 10, 10, 10, 10, 05, 20, 10, 20, 05}, //fight
    {10, 20, 10, 10, 10, 05, 20, 10, 05, 10, 10, 10, 20, 05, 10, 10, 10, 10, 10}, //flying
    {10, 10, 10, 05, 05, 05, 10, 05, 00, 10, 10, 10, 20, 10, 10, 10, 10, 10, 20}, //poison
    {10, 10, 00, 20, 10, 20, 05, 10, 20, 10, 20, 10, 05, 20, 10, 10, 10, 10, 10}, //ground
    {10, 05, 20, 10, 05, 10, 20, 10, 05, 10, 20, 10, 10, 10, 10, 20, 10, 10, 10}, //rock
    {10, 05, 05, 05, 10, 10, 10, 05, 05, 10, 05, 10, 20, 10, 20, 10, 10, 20, 05}, //bug
    {00, 10, 10, 10, 10, 10, 10, 20, 10, 10, 10, 10, 10, 10, 20, 10, 10, 05, 10}, //ghost
    {10, 10, 10, 10, 10, 20, 10, 10, 05, 10, 05, 05, 10, 05, 10, 20, 10, 10, 20}, //steel
    {10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10}, //egg
    {10, 10, 10, 10, 10, 05, 20, 10, 20, 10, 05, 05, 20, 10, 10, 20, 05, 10, 10}, //fire
    {10, 10, 10, 10, 20, 20, 10, 10, 10, 10, 20, 05, 05, 10, 10, 10, 05, 10, 10}, //water
    {10, 10, 05, 05, 20, 20, 05, 10, 05, 10, 05, 20, 05, 10, 10, 10, 05, 10, 10}, //grass
    {10, 10, 20, 10, 00, 10, 10, 10, 10, 10, 10, 20, 05, 05, 10, 10, 05, 10, 10}, //electric
    {10, 20, 10, 20, 10, 10, 10, 10, 05, 10, 10, 10, 10, 10, 05, 10, 10, 00, 10}, //psychic
    {10, 10, 20, 10, 20, 10, 10, 10, 05, 10, 05, 05, 20, 10, 10, 05, 20, 10, 10}, //ice
    {10, 10, 10, 10, 10, 10, 10, 10, 05, 10, 10, 10, 10, 10, 10, 10, 20, 10, 00}, //dragon
    {10, 05, 10, 10, 10, 10, 10, 20, 10, 10, 10, 10, 10, 10, 20, 10, 10, 05, 05}, //dark
    {10, 20, 10, 05, 10, 10, 10, 10, 05, 10, 05, 10, 10, 10, 10, 10, 20, 20, 10} //fairy
};

u16 damage_type_effectiveness_update(u8 attacking_type, u8 defending_type, u8 atk_bank, u8 def_bank, u16 chained_effect, u8 airstatus) {
    u8 effect, atype = attacking_type, dtype = defending_type;
    if (!chained_effect || atype == TYPE_EGG || dtype == TYPE_EGG)
        return chained_effect;

    if (atype >= TYPE_FAIRY)
        atype = atype - 5;

    if (dtype >= TYPE_FAIRY)
        dtype = dtype - 5;
    effect = type_effectiveness_table[atype][dtype];

    if (custom_battle_elements.ptr->various.inverse_battle) {
        if (effect == 20) {
            effect = 5;
        } else if (effect == 5 || effect == 0) {
            effect = 20;
        }
    }
    //handle normal / fighting on ghost
    if ((((attacking_type == TYPE_NORMAL || attacking_type == TYPE_FIGHTING) && defending_type == TYPE_GHOST && ((battle_participants[def_bank].status2.foresight))) || battle_participants[atk_bank].ability_id == ABILITY_SCRAPPY) && effect == 0) {
        effect = 10;
    }
    //handle other effectiveness changers here

    switch (effect) {
        case 0:
            chained_effect = 0;
            break;
        case 5:
            chained_effect = chained_effect >> 1;
            break;
        case 20:
            chained_effect = chained_effect << 1;
            break;
    }
    return chained_effect;

}

u16 apply_type_effectiveness(u16 chained_effect, u8 move_type, u8 target_bank, u8 atk_bank, u8 airstatus) {
    u8 defender_type1 = battle_participants[target_bank].type1;
    u8 defender_type2 = battle_participants[target_bank].type2;
    //set different types
    if (defender_type2 == defender_type1)
        defender_type2 = TYPE_EGG;
    chained_effect = damage_type_effectiveness_update(move_type, defender_type1, atk_bank, target_bank, chained_effect, airstatus);
    chained_effect = damage_type_effectiveness_update(move_type, defender_type2, atk_bank, target_bank, chained_effect, airstatus);
    return chained_effect;
}

u16 type_effectiveness_calc(u16 move, u8 move_type, u8 atk_bank, u8 def_bank, u8 effects_handling_and_recording) {
    u16 chained_effect = 64;
    //TODO: double_type moves
    //TODO: get air status
    chained_effect = apply_type_effectiveness(chained_effect, move_type, def_bank, atk_bank, 2);
    //TODO: save into structs
    //TODO: effect_handling_and_recoring
    return chained_effect;
}

u8 has_type(u8 bank, u8 type) {
    return battle_participants[bank].type1 == type || battle_participants[bank].type2 == type;
}

u8 get_item_effect(u8 bank, u8 check_negating_effects) {
    if (check_negating_effects) {
        if (battle_participants[bank].ability_id == ABILITY_KLUTZ || custom_battle_elements.ptr->bank_affecting[bank].embargo)
            return ITEM_EFFECT_NOEFFECT;
    }
    if (battle_participants[bank].held_item == ITEM_ENIGMABERRY) {
        return battle_enigma_berry[bank].battle_effect_x12;
    } else {
        return item_get_x12(battle_participants[bank].held_item);
    }
}

u8 cant_poison(u8 bank, u8 self_inflicted) { //0 == can poison
    //1 == is already poisoned
    //2 == has other major condition
    //3 == type doesn't allow it
    //4 == ability doesn't allow it
    //5 == safeguard protection
    //8 == misty terrain doesn't allow it !TODO!
    if (battle_participants[bank].status.flags.poison || battle_participants[bank].status.flags.toxic_poison)
        return 1;
    if (battle_participants[bank].status.int_status)
        return 2;
    if (has_type(bank, TYPE_POISON) || has_type(bank, TYPE_STEEL))
        return 3;
    if (((battle_participants[bank].ability_id == ABILITY_IMMUNITY || (battle_participants[bank].ability_id == ABILITY_LEAF_GUARD && (battle_weather.flags.sun || battle_weather.flags.permament_sun || battle_weather.flags.harsh_sun)))))
        return 4;
    if (side_affecting_halfword[get_side_from_bank(bank)].safeguard_on && !self_inflicted)
        return 5;
    return 0;
}