mutation.cpp

#include "player.h"
#include "mutation.h"
#include "game.h"

// mutation_effect handles things like destruction of armor, etc.
void mutation_effect(game *g, player &p, pl_flag mut);

void player::mutate(game *g)
{
 bool force_bad = one_in(2); // 50% chance!
 if (has_trait(PF_ROBUST) && force_bad && one_in(2))
  force_bad = false; // 25% chance!

// First, see if we should ugrade/extend an existing mutation
 std::vector<pl_flag> upgrades;
 for (int i = 1; i < PF_MAX2; i++) {
  if (has_trait(i)) {
   for (int j = 0; j < g->mutation_data[i].replacements.size(); j++) {
    pl_flag tmp = g->mutation_data[i].replacements[j];
    if (!has_trait(tmp) && !has_child_flag(g, tmp) &&
        (!force_bad || traits[tmp].points <= 0))
     upgrades.push_back(tmp);
   }
   for (int j = 0; j < g->mutation_data[i].additions.size(); j++) {
    pl_flag tmp = g->mutation_data[i].additions[j];
    if (!has_trait(tmp) && !has_child_flag(g, tmp) &&
        (!force_bad || traits[tmp].points <= 0))
     upgrades.push_back(tmp);
   }
  }
 }

 if (upgrades.size() > 0 && rng(0, upgrades.size() + 4) < upgrades.size()) {
  mutate_towards(g, upgrades[ rng(0, upgrades.size() - 1) ]);
  return;
 }

// Next, see if we should mutate within a given category
 mutation_category cat = MUTCAT_NULL;

 int total = 0, highest = 0;
 for (int i = 0; i < NUM_MUTATION_CATEGORIES; i++) {
  total += mutation_category_level[i];
  if (mutation_category_level[i] > highest) {
   cat = mutation_category(i);
   highest = mutation_category_level[i];
  }
 }

 if (rng(0, total) > highest)
  cat = MUTCAT_NULL; // Not a strong enough pull, just mutate something random!

 std::vector<pl_flag> valid; // Valid mutations
 bool first_pass = (cat != MUTCAT_NULL);

 do {
// If we tried once with a non-NULL category, and couldn't find anything valid
// there, try again with MUTCAT_NULL
  if (cat != MUTCAT_NULL && !first_pass)
   cat = MUTCAT_NULL;

  if (cat == MUTCAT_NULL) { // Pull the full list
   for (int i = 1; i < PF_MAX2; i++) {
    if (g->mutation_data[i].valid)
     valid.push_back( pl_flag(i) );
   }
  } else // Pull the category's list
   valid = mutations_from_category(cat);

// Remove anything we already have, or that we have a child of, or that's
// positive and we're forcing bad
  for (int i = 0; i < valid.size(); i++) {
   if (has_trait(valid[i]) || has_child_flag(g, valid[i]) ||
       (force_bad && traits[ valid[i] ].points > 0)) {
    valid.erase(valid.begin() + i);
    i--;
   }
  }

  if (valid.empty())
   first_pass = false; // So we won't repeat endlessly
   
 } while (valid.empty() && cat != MUTCAT_NULL);


 if (valid.empty())
  return; // Couldn't find anything at all!

 pl_flag selection = valid[ rng(0, valid.size() - 1) ]; // Pick one!

 mutate_towards(g, selection);
}

void player::mutate_towards(game *g, pl_flag mut)
{
 if (has_child_flag(g, mut)) {
  remove_child_flag(g, mut);
  return;
 }
 std::vector<pl_flag> prereq = g->mutation_data[mut].prereqs;
 std::vector<pl_flag> cancel = g->mutation_data[mut].cancels;

 for (int i = 0; i < cancel.size(); i++) {
  if (!has_trait( cancel[i] )) {
   cancel.erase(cancel.begin() + i);
   i--;
  }
 }

 if (!cancel.empty()) {
  pl_flag removed = cancel[ rng(0, cancel.size() - 1) ];
  remove_mutation(g, removed);
  return;
 }

 for (int i = 0; i < prereq.size(); i++) {
  if (has_trait(prereq[i])) {
   prereq.erase(prereq.begin() + i);
   i--;
  }
 }
 if (!prereq.empty()) {
  pl_flag devel = prereq[ rng(0, prereq.size() - 1) ];
  mutate_towards(g, devel);
  return;
 }

// Check if one of the prereqs that we have TURNS INTO this one
 pl_flag replacing = PF_NULL;
 prereq = g->mutation_data[mut].prereqs; // Reset it
 for (int i = 0; i < prereq.size(); i++) {
  if (has_trait(prereq[i])) {
   pl_flag pre = prereq[i];
   for (int j = 0; replacing == PF_NULL &&
                   j < g->mutation_data[pre].replacements.size(); j++) {
    if (g->mutation_data[pre].replacements[j] == mut)
     replacing = pre;
   }
  }
 }

 toggle_trait(mut);
 if (replacing != PF_NULL) {
  g->add_msg("Your %s turns into %s!", traits[replacing].name.c_str(),
             traits[mut].name.c_str());
  toggle_trait(replacing);
 } else
  g->add_msg("You gain %s!", traits[mut].name.c_str());
 mutation_effect(g, *this, mut);

// Weight us towards any categories that include this mutation
 for (int i = 0; i < NUM_MUTATION_CATEGORIES; i++) {
  std::vector<pl_flag> group = mutations_from_category(mutation_category(i));
  bool found = false;
  for (int j = 0; !found && j < group.size(); j++) {
   if (group[j] == mut)
    found = true;
  }
  if (found)
   mutation_category_level[i] += 8;
  else if (mutation_category_level[i] > 0 &&
           !one_in(mutation_category_level[i]))
   mutation_category_level[i]--;
 }

}

void player::remove_mutation(game *g, pl_flag mut)
{
// Check if there's a prereq we should shrink back into
 pl_flag replacing = PF_NULL;
 std::vector<pl_flag> originals = g->mutation_data[mut].prereqs;
 for (int i = 0; replacing == PF_NULL && i < originals.size(); i++) {
  pl_flag pre = originals[i];
  for (int j = 0; replacing == PF_NULL &&
                  j < g->mutation_data[pre].replacements.size(); j++) {
   if (g->mutation_data[pre].replacements[j] == mut)
    replacing = pre;
  }
 }

 toggle_trait(mut);
 if (replacing != PF_NULL) {
  g->add_msg("Your %s turns into %s.", traits[mut].name.c_str(),
             traits[replacing].name.c_str());
  toggle_trait(replacing);
  mutation_effect(g, *this, replacing);
 } else
  g->add_msg("You lose your %s.", traits[mut].name.c_str());

}

bool player::has_child_flag(game *g, pl_flag flag)
{
 for (int i = 0; i < g->mutation_data[flag].replacements.size(); i++) {
  pl_flag tmp = g->mutation_data[flag].replacements[i];
  if (has_trait(tmp) || has_child_flag(g, tmp))
   return true;
 }
 return false;
}

void player::remove_child_flag(game *g, pl_flag flag)
{
 for (int i = 0; i < g->mutation_data[flag].replacements.size(); i++) {
  pl_flag tmp = g->mutation_data[flag].replacements[i];
  if (has_trait(tmp)) {
   remove_mutation(g, tmp);
   return;
  } else if (has_child_flag(g, tmp)) {
   remove_child_flag(g, tmp);
   return;
  }
 }
}

void mutation_effect(game *g, player &p, pl_flag mut)
{
 bool is_u = (&p == &(g->u));
 bool destroy = false, skip_cloth = false;
 std::vector<body_part> bps;
 switch (mut) {
// Push off gloves
  case PF_WEBBED:
  case PF_ARM_TENTACLES:
  case PF_ARM_TENTACLES_4:
  case PF_ARM_TENTACLES_8:
   bps.push_back(bp_hands);
   break;
// Destroy gloves
  case PF_TALONS:
   destroy = true;
   bps.push_back(bp_hands);
   break;
// Destroy mouthwear
  case PF_BEAK:
  case PF_MANDIBLES:
   destroy = true;
   bps.push_back(bp_mouth);
   break;
// Destroy footwear
  case PF_HOOVES:
   destroy = true;
   bps.push_back(bp_feet);
   break;
// Destroy torsowear
  case PF_SHELL:
   destroy = true;
   bps.push_back(bp_torso);
   break;
// Push off all helmets
  case PF_HORNS_CURLED:
  case PF_CHITIN3:
   bps.push_back(bp_head);
   break;
// Push off non-cloth helmets
  case PF_HORNS_POINTED:
  case PF_ANTENNAE:
  case PF_ANTLERS:
   skip_cloth = true;
   bps.push_back(bp_head);
   break;
 }

 for (int i = 0; i < p.worn.size(); i++) {
  for (int j = 0; j < bps.size(); j++) {
   if ((dynamic_cast<it_armor*>(p.worn[i].type))->covers & mfb(bps[j])) {
    if (destroy) {
     if (is_u)
      g->add_msg("Your %s is destroyed!", p.worn[i].tname().c_str());
    } else {
     if (is_u)
      g->add_msg("Your %s is pushed off.", p.worn[i].tname().c_str());
     g->m.add_item(p.posx, p.posy, p.worn[i]);
    }
    p.worn.erase(p.worn.begin() + i);
    i--;
   }
  }
 }
}