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/*
 *  File:       lev-pand.cc
 *  Summary:    Functions used in Pandemonium.
 *  Written by: Linley Henzell
 */

#include "AppHdr.h"

#include <algorithm>

#include "lev-pand.h"

#include "externs.h"
#include "dungeon.h"
#include "env.h"
#include "mon-place.h"
#include "mgen_data.h"
#include "mon-pick.h"
#include "random.h"

void init_pandemonium(void)
{
    int pc = 0;

    for (pc = 0; pc < MAX_MONSTERS; ++pc)
    {
        monsters *monster = &menv[pc];

        // Looks for unique demons and sets appropriate lists of demons.
        // NB - also sets the level colours.
        if (monster->type == MONS_MNOLEG)
        {
            env.mons_alloc[0] = MONS_ABOMINATION_SMALL;
            env.mons_alloc[1] = MONS_ABOMINATION_SMALL;
            env.mons_alloc[2] = MONS_ABOMINATION_SMALL;
            env.mons_alloc[3] = MONS_ABOMINATION_LARGE;
            env.mons_alloc[4] = MONS_NEQOXEC;
            env.mons_alloc[5] = MONS_MIDGE;
            env.mons_alloc[6] = MONS_NEQOXEC;
            env.mons_alloc[7] = MONS_BLUE_DEATH;
            env.mons_alloc[8] = MONS_BALRUG;
            env.mons_alloc[9] = MONS_LEMURE;
            return;
        }

        if (monster->type == MONS_LOM_LOBON)
        {
            env.mons_alloc[0] = MONS_HELLWING;
            env.mons_alloc[1] = MONS_SMOKE_DEMON;
            env.mons_alloc[2] = MONS_SMOKE_DEMON;
            env.mons_alloc[3] = MONS_YNOXINUL;
            env.mons_alloc[4] = MONS_GREEN_DEATH;
            env.mons_alloc[5] = MONS_BLUE_DEATH;
            env.mons_alloc[6] = MONS_SMOKE_DEMON;
            env.mons_alloc[7] = MONS_HELLWING;
            env.mons_alloc[8] = MONS_WHITE_IMP;
            env.mons_alloc[9] = MONS_HELLWING;
            return;
        }

        if (monster->type == MONS_CEREBOV)
        {
            env.mons_alloc[0] = MONS_EFREET;
            env.mons_alloc[1] = MONS_ABOMINATION_SMALL;
            env.mons_alloc[2] = MONS_ORANGE_DEMON;
            env.mons_alloc[3] = MONS_ORANGE_DEMON;
            env.mons_alloc[4] = MONS_NEQOXEC;
            env.mons_alloc[5] = MONS_LEMURE;
            env.mons_alloc[6] = MONS_ORANGE_DEMON;
            env.mons_alloc[7] = MONS_YNOXINUL;
            env.mons_alloc[8] = MONS_BALRUG;
            env.mons_alloc[9] = MONS_BALRUG;
            return;
        }

        if (monster->type == MONS_GLOORX_VLOQ)
        {
            env.mons_alloc[0] = MONS_SKELETON_SMALL;
            env.mons_alloc[1] = MONS_SKELETON_SMALL;
            env.mons_alloc[2] = MONS_SKELETON_LARGE;
            env.mons_alloc[3] = MONS_WHITE_IMP;
            env.mons_alloc[4] = MONS_CACODEMON;
            env.mons_alloc[5] = MONS_HELLWING;
            env.mons_alloc[6] = MONS_SMOKE_DEMON;
            env.mons_alloc[7] = MONS_EXECUTIONER;
            env.mons_alloc[8] = MONS_EXECUTIONER;
            env.mons_alloc[9] = MONS_EXECUTIONER;
            return;
        }
    }

    // colour of monster 9 is colour of floor, 8 is colour of rock
    // IIRC, BLACK is set to LIGHTGREY

    for (pc = 0; pc < 10; ++pc)
    {
        switch (random2(17))
        {
        case 0: case 10: env.mons_alloc[pc] = MONS_WHITE_IMP;         break;
        case 1: case 11: env.mons_alloc[pc] = MONS_LEMURE;            break;
        case 2: case 12: env.mons_alloc[pc] = MONS_UFETUBUS;          break;
        case 3: case 13: env.mons_alloc[pc] = MONS_MANES;             break;
        case 4: case 14: env.mons_alloc[pc] = MONS_MIDGE;             break;
        case 5:          env.mons_alloc[pc] = MONS_NEQOXEC;           break;
        case 6:          env.mons_alloc[pc] = MONS_ORANGE_DEMON;      break;
        case 7:          env.mons_alloc[pc] = MONS_HELLWING;          break;
        case 8:          env.mons_alloc[pc] = MONS_SMOKE_DEMON;       break;
        case 9:          env.mons_alloc[pc] = MONS_YNOXINUL;          break;
        case 15:         env.mons_alloc[pc] = MONS_ABOMINATION_SMALL; break;
        case 16:         env.mons_alloc[pc] = MONS_ABOMINATION_LARGE; break;
        }

        if (one_chance_in(10))
        {
            env.mons_alloc[pc] =
                static_cast<monster_type>(MONS_HELLION + random2(10));
        }

        if (one_chance_in(30))
            env.mons_alloc[pc] = MONS_RED_DEVIL;

        if (one_chance_in(30))
            env.mons_alloc[pc] = MONS_IMP;

        if (one_chance_in(30))
            env.mons_alloc[pc] = MONS_SIXFIRHY;

        if (one_chance_in(20))
        {
            env.mons_alloc[pc] =
                static_cast<monster_type>(MONS_DEMONIC_CRAWLER + random2(5));
        }
    }

    if (one_chance_in(8))
    {
        env.mons_alloc[7] =
            static_cast<monster_type>(MONS_EXECUTIONER + random2(5));
    }

    if (one_chance_in(5))
    {
        env.mons_alloc[8] =
            static_cast<monster_type>(MONS_EXECUTIONER + random2(5));
    }

    if (one_chance_in(3))
    {
        env.mons_alloc[9] =
            static_cast<monster_type>(MONS_EXECUTIONER + random2(5));
    }

    if (one_chance_in(10))
        env.mons_alloc[7 + random2(3)] = MONS_FIEND;

    if (one_chance_in(10))
        env.mons_alloc[7 + random2(3)] = MONS_ICE_FIEND;

    if (one_chance_in(10))
        env.mons_alloc[7 + random2(3)] = MONS_SHADOW_FIEND;

    if (one_chance_in(10))
        env.mons_alloc[7 + random2(3)] = MONS_PIT_FIEND;

    // Set at least some specific monsters for the special levels - this
    // can also be used to set some colours.

    env.floor_colour = BLACK;
    env.rock_colour  = BLACK;
    dgn_set_colours_from_monsters();
}

void pandemonium_mons(void)
{
    // must leave allowance for monsters rare on pandemonium (wizards, etc.)
    int pan_mons = env.mons_alloc[random2(10)];

    if (one_chance_in(40))
    {
        do
            pan_mons = random2(NUM_MONSTERS);   // was random2(400) {dlb}
        while (!mons_pan(pan_mons));
    }
    mgen_data mg(static_cast<monster_type>(pan_mons));
    mg.level_type = LEVEL_PANDEMONIUM;

    mons_place(mg);
}