/*!
 * @brief 同種のアイテムをインベントリや床に重ね合わせたり、その判断を行う処理
 * @date 2020/06/03
 * @author Hourier
 */

#include "object/object-stack.h"
#include "sv-definition/sv-other-types.h"
#include "perception/object-perception.h"
#include "object-enchant/object-ego.h"
#include "object/object-hook.h"
#include "object/object-kind.h"
#include "object/object-value.h"
#include "object-enchant/special-object-flags.h"
#include "object-enchant/trc-types.h"

/*!
 * @brief 魔法棒やロッドのスロット分割時に使用回数を分配する /
 * Distribute charges of rods or wands.
 * @param o_ptr 分割元オブジェクトの構造体参照ポインタ source item
 * @param q_ptr 分割先オブジェクトの構造体参照ポインタ target item, must be of the same type as o_ptr
 * @param amt 分割したい回数量 number of items that are transfered
 * @return なし
 * @details
 * Hack -- If rods or wands are dropped, the total maximum timeout or\n
 * charges need to be allocated between the two stacks.  If all the items\n
 * are being dropped, it makes for a neater message to leave the original\n
 * stack's pval alone. -LM-\n
 */
void distribute_charges(object_type *o_ptr, object_type *q_ptr, int amt)
{
    if ((o_ptr->tval != TV_WAND) && (o_ptr->tval != TV_ROD))
        return;

    q_ptr->pval = o_ptr->pval * amt / o_ptr->number;
    if (amt < o_ptr->number)
        o_ptr->pval -= q_ptr->pval;

    if ((o_ptr->tval != TV_ROD) || !o_ptr->timeout)
        return;

    if (q_ptr->pval > o_ptr->timeout)
        q_ptr->timeout = o_ptr->timeout;
    else
        q_ptr->timeout = q_ptr->pval;

    if (amt < o_ptr->number)
        o_ptr->timeout -= q_ptr->timeout;
}

/*!
 * @brief 魔法棒やロッドの使用回数を減らす /
 * @param o_ptr オブジェクトの構造体参照ポインタ source item
 * @param amt 減らしたい回数量 number of items that are transfered
 * @return なし
 * @details
 * Hack -- If rods or wand are destroyed, the total maximum timeout or\n
 * charges of the stack needs to be reduced, unless all the items are\n
 * being destroyed. -LM-\n
 */
void reduce_charges(object_type *o_ptr, int amt)
{
    if (((o_ptr->tval == TV_WAND) || (o_ptr->tval == TV_ROD)) && (amt < o_ptr->number)) {
        o_ptr->pval -= o_ptr->pval * amt / o_ptr->number;
    }
}

/*!
 * @brief 両オブジェクトをスロットに重ね合わせ可能な最大数を返す。
 * Determine if an item can partly absorb a second item. Return maximum number of stack.
 * @param o_ptr 検証したいオブジェクトの構造体参照ポインタ1
 * @param j_ptr 検証したいオブジェクトの構造体参照ポインタ2
 * @return 重ね合わせ可能なアイテム数
 */
int object_similar_part(object_type *o_ptr, object_type *j_ptr)
{
    const int max_stack_size = 99;
    int max_num = max_stack_size;
    if (o_ptr->k_idx != j_ptr->k_idx)
        return 0;

    switch (o_ptr->tval) {
    case TV_CHEST:
    case TV_CARD:
    case TV_CAPTURE: {
        return 0;
    }
    case TV_STATUE: {
        if ((o_ptr->sval != SV_PHOTO) || (j_ptr->sval != SV_PHOTO))
            return 0;
        if (o_ptr->pval != j_ptr->pval)
            return 0;
        break;
    }
    case TV_FIGURINE:
    case TV_CORPSE: {
        if (o_ptr->pval != j_ptr->pval)
            return 0;

        break;
    }
    case TV_FOOD:
    case TV_POTION:
    case TV_SCROLL: {
        break;
    }
    case TV_STAFF: {
        if ((!(o_ptr->ident & (IDENT_EMPTY)) && !object_is_known(o_ptr)) || (!(j_ptr->ident & (IDENT_EMPTY)) && !object_is_known(j_ptr)))
            return 0;

        if (o_ptr->pval != j_ptr->pval)
            return 0;

        break;
    }
    case TV_WAND: {
        if ((!(o_ptr->ident & (IDENT_EMPTY)) && !object_is_known(o_ptr)) || (!(j_ptr->ident & (IDENT_EMPTY)) && !object_is_known(j_ptr)))
            return 0;

        break;
    }
    case TV_ROD: {
        max_num = MIN(max_num, MAX_SHORT / k_info[o_ptr->k_idx].pval);
        break;
    }
    case TV_BOW:
    case TV_DIGGING:
    case TV_HAFTED:
    case TV_POLEARM:
    case TV_SWORD:
    case TV_BOOTS:
    case TV_GLOVES:
    case TV_HELM:
    case TV_CROWN:
    case TV_SHIELD:
    case TV_CLOAK:
    case TV_SOFT_ARMOR:
    case TV_HARD_ARMOR:
    case TV_DRAG_ARMOR:
    case TV_RING:
    case TV_AMULET:
    case TV_LITE:
    case TV_WHISTLE: {
        if (!object_is_known(o_ptr) || !object_is_known(j_ptr))
            return 0;
    }
        /* Fall through */
    case TV_BOLT:
    case TV_ARROW:
    case TV_SHOT: {
        if (object_is_known(o_ptr) != object_is_known(j_ptr))
            return 0;
        if (o_ptr->feeling != j_ptr->feeling)
            return 0;
        if (o_ptr->to_h != j_ptr->to_h)
            return 0;
        if (o_ptr->to_d != j_ptr->to_d)
            return 0;
        if (o_ptr->to_a != j_ptr->to_a)
            return 0;
        if (o_ptr->pval != j_ptr->pval)
            return 0;
        if (object_is_artifact(o_ptr) || object_is_artifact(j_ptr))
            return 0;
        if (o_ptr->name2 != j_ptr->name2)
            return 0;
        if (o_ptr->xtra3 != j_ptr->xtra3)
            return 0;
        if (o_ptr->xtra4 != j_ptr->xtra4)
            return 0;
        if (o_ptr->xtra1 || j_ptr->xtra1)
            return 0;
        if (o_ptr->timeout || j_ptr->timeout)
            return 0;
        if (o_ptr->ac != j_ptr->ac)
            return 0;
        if (o_ptr->dd != j_ptr->dd)
            return 0;
        if (o_ptr->ds != j_ptr->ds)
            return 0;
        break;
    }
    default: {
        if (!object_is_known(o_ptr) || !object_is_known(j_ptr))
            return 0;

        break;
    }
    }

    for (int i = 0; i < TR_FLAG_SIZE; i++)
        if (o_ptr->art_flags[i] != j_ptr->art_flags[i])
            return 0;

    if (o_ptr->curse_flags != j_ptr->curse_flags)
        return 0;
    if ((o_ptr->ident & (IDENT_BROKEN)) != (j_ptr->ident & (IDENT_BROKEN)))
        return 0;

    if (o_ptr->inscription && j_ptr->inscription && (o_ptr->inscription != j_ptr->inscription))
        return 0;

    if (!stack_force_notes && (o_ptr->inscription != j_ptr->inscription))
        return 0;
    if (!stack_force_costs && (o_ptr->discount != j_ptr->discount))
        return 0;

    return max_num;
}

/*!
 * @brief 両オブジェクトをスロットに重ねることができるかどうかを返す。
 * Determine if an item can absorb a second item.
 * @param o_ptr 検証したいオブジェクトの構造体参照ポインタ1
 * @param j_ptr 検証したいオブジェクトの構造体参照ポインタ2
 * @return 重ね合わせ可能ならばTRUEを返す。
 */
bool object_similar(object_type *o_ptr, object_type *j_ptr)
{
    int total = o_ptr->number + j_ptr->number;
    int max_num = object_similar_part(o_ptr, j_ptr);
    if (!max_num)
        return FALSE;
    if (total > max_num)
        return 0;

    return TRUE;
}

/*!
 * @brief 両オブジェクトをスロットに重ね合わせる。
 * Allow one item to "absorb" another, assuming they are similar
 * @param o_ptr 重ね合わせ先のオブジェクトの構造体参照ポインタ
 * @param j_ptr 重ね合わせ元のオブジェクトの構造体参照ポインタ
 * @return なし
 */
void object_absorb(object_type *o_ptr, object_type *j_ptr)
{
    int max_num = object_similar_part(o_ptr, j_ptr);
    int total = o_ptr->number + j_ptr->number;
    int diff = (total > max_num) ? total - max_num : 0;

    o_ptr->number = (total > max_num) ? max_num : total;
    if (object_is_known(j_ptr))
        object_known(o_ptr);

    if (((o_ptr->ident & IDENT_STORE) || (j_ptr->ident & IDENT_STORE)) && (!((o_ptr->ident & IDENT_STORE) && (j_ptr->ident & IDENT_STORE)))) {
        if (j_ptr->ident & IDENT_STORE)
            j_ptr->ident &= 0xEF;
        if (o_ptr->ident & IDENT_STORE)
            o_ptr->ident &= 0xEF;
    }

    if (object_is_fully_known(j_ptr))
        o_ptr->ident |= (IDENT_FULL_KNOWN);
    if (j_ptr->inscription)
        o_ptr->inscription = j_ptr->inscription;
    if (j_ptr->feeling)
        o_ptr->feeling = j_ptr->feeling;
    if (o_ptr->discount < j_ptr->discount)
        o_ptr->discount = j_ptr->discount;
    if (o_ptr->tval == TV_ROD) {
        o_ptr->pval += j_ptr->pval * (j_ptr->number - diff) / j_ptr->number;
        o_ptr->timeout += j_ptr->timeout * (j_ptr->number - diff) / j_ptr->number;
    }

    if (o_ptr->tval == TV_WAND) {
        o_ptr->pval += j_ptr->pval * (j_ptr->number - diff) / j_ptr->number;
    }
}
