#include "sector.h"

#define SYS_NAME_FLAGS 32
static const char* sys_names[SYS_NAME_FLAGS] = 
  { "en", "la", "can", "be", "and", "phi", "eth", "ol", "ve", "ho", "a",
    "lia", "an", "ar", "ur", "mi", "in", "ti", "qu", "so", "ed", "ess",
    "ex", "io", "ce", "ze", "fa", "ay", "wa", "da", "ack", "gre" };

Sector::Sector(int x, int y) {
  unsigned long _init[2] = { x, y };
  sx = x; sy = y;
  MTRand rand(_init, 2);

  m_numSystems = rand(3,6);

  for(int i = 0; i < m_numSystems; i++) {
    System s;
    s.p.x = rand(SIZE);
    s.p.y = rand(SIZE);
    s.p.z = rand(2*SIZE)-SIZE;
    s.name = GenName(rand);

    float spec = rand(1.0);
    /* Frequences are from our friends over at wikipedia. ^.^ */
    if(spec < 0.0000003) {
      s.primaryStarClass = StarSystem::SBody::SUBTYPE_STAR_O;
    } else if(spec < 0.0013) {
      s.primaryStarClass = StarSystem::SBody::SUBTYPE_STAR_B;
    } else if(spec < 0.0073) {
      s.primaryStarClass = StarSystem::SBody::SUBTYPE_STAR_A;
    } else if(spec < 0.0373) {
      s.primaryStarClass = StarSystem::SBody::SUBTYPE_STAR_F;
    } else if(spec < 0.1133) {
      s.primaryStarClass = StarSystem::SBody::SUBTYPE_STAR_G;
    } else if(spec < 0.2343) {
      s.primaryStarClass = StarSystem::SBody::SUBTYPE_STAR_K;
    } else {
      s.primaryStarClass = StarSystem::SBody::SUBTYPE_STAR_M;
    }

    m_systems.push_back(s);
  }
}

float Sector::DistanceBetween(const Sector* a, int sysIdxA, const Sector* b, int sysIdxB) {
  vector3f dv = a->m_systems[sysIdxA].p - b->m_systems[sysIdxB].p;
  dv += Sector::SIZE*vector3f(a->sx - b->sx, a->sy - b->sy, 0);
  return dv.Length();
}

std::string Sector::GenName(MTRand& rand) {
  std::string name;

  int len = rand(2, 3);
  for(int i = 0; i < len; i++) {
    name += sys_names[rand(0, SYS_NAME_FLAGS-1)];
  }
  name[0] = toupper(name[0]);
  return name;
}