/**
 * @file comm.c
 *
 * @brief For communicating with planets/pilots.
 */

#include "lephisto.h"
#include "log.h"
#include "toolkit.h"
#include "dialogue.h"
#include "pilot.h"
#include "rng.h"
#include "llua.h"
#include "player.h"
#include "comm.h"

#define BUTTON_WIDTH  80  /**< Button width. */
#define BUTTON_HEIGHT 30  /*<< Button height. */

static Pilot* comm_pilot = NULL; /**< Pilot currently talking to. */

/* Static. */
static void comm_bribe(unsigned int wid, char* unused);
static unsigned int comm_getBribeAmount(void);
static char* comm_getBribeString(char* str);
/* Extern. */
extern void ai_setPilot(Pilot* p); /**< From ai.c. */

/**
 * @brief Open the communication dialogue with a pilot.
 *    @param pilot Pilot to communicate with.
 *    @return 0 on success.
 */
int comm_open(unsigned int pilot) {
  int x, y, w;
  glTexture* logo, *gfx_comm;
  char* name, *stand;
  unsigned int wid;
  glColour* c;

  /* Get the pilot. */
  comm_pilot = pilot_get(pilot);
  if(comm_pilot == NULL)
    return -1;

  /* Must not be disabled. */
  if(pilot_isFlag(comm_pilot, PILOT_DISABLED)) {
    player_message("%s does not respond.", comm_pilot->name);
  }

  /* Get graphics and text. */
  gfx_comm = comm_pilot->ship->gfx_comm;
  logo = faction_logoSmall(comm_pilot->faction);
  name = comm_pilot->name;
  /* Get standing colour / text. */
  if(pilot_isFlag(comm_pilot, PILOT_HOSTILE)) {
    stand = "Hostile";
    c = &cHostile;
  } else {
    stand = faction_getStandingBroad(faction_getPlayer(comm_pilot->faction));
    c = faction_getColour(comm_pilot->faction);
  }
  w = MAX(gl_printWidth(NULL, name), gl_printWidth(NULL, stand));
  y = gl_defFont.h*2 + 15;
  if(logo != NULL) {
    w += logo->w;
    y = MAX(y, logo->w);
  }
  x = (gfx_comm->w - w) / 2;

  /* Create the window. */
  wid = window_create("Communication Channel", -1, -1,
      20 + gfx_comm->w + 20 + BUTTON_WIDTH + 20, 30 + gfx_comm->h + y + 5 + 20);

  /* Create the ship image. */
  window_addRect(wid, 20, -30, gfx_comm->w, gfx_comm->h + y + 5, "rctShip", &cGrey10, 1);
  window_addImage(wid, 20, -30, "imgShip", gfx_comm, 0);

  /* Faction logo. */
  if(logo != NULL) {
    window_addImage(wid, x, -30 - gfx_comm->h - 5,
        "imgFaction", logo, 0);
    x += logo->w + 10;
    y -= (logo->w - (gl_defFont.h*2 + 15)) / 2;
  }

  /* Name. */
  window_addText(wid, x, -30 - gfx_comm->h - y + gl_defFont.h*2 + 10,
      gfx_comm->w - x, 20, 0, "txtName",
      NULL, &cDConsole, name);

  /* Standing. */
  window_addText(wid, x, -30 - gfx_comm->h - y + gl_defFont.h + 5,
      gfx_comm->w - x, 20, 0, "txtStanding", NULL, c, stand);

  /* Buttons. */
  window_addButton(wid, -20, 20, BUTTON_WIDTH, BUTTON_HEIGHT,
      "btnClose", "Close Channel", window_close);
  window_addButton(wid, -20, 20 + BUTTON_HEIGHT + 20,
      BUTTON_WIDTH, BUTTON_HEIGHT, "btnGreet", "Greet", NULL);

  if(!pilot_isFlag(comm_pilot, PILOT_BRIBED) && /* Not already bribed. */
      ((faction_getPlayer(comm_pilot->faction) < 0) || /* Hostile. */
       pilot_isFlag(comm_pilot, PILOT_HOSTILE)))
    window_addButton(wid, -20, 20 + 2*BUTTON_HEIGHT + 40,
        BUTTON_WIDTH, BUTTON_HEIGHT, "btnBribe", "Bribe", comm_bribe);
  else
    window_addButton(wid, -20, 20 + 2*BUTTON_HEIGHT + 40,
        BUTTON_WIDTH, BUTTON_HEIGHT, "btnRequest", "Request...", NULL);

  return 0;
}

/**
 * @brief Try to bribe the pilot.
 *    @param wid ID of window calling the function.
 *    @param unused Unused.
 */
static void comm_bribe(unsigned int wid, char* unused) {
  (void)unused;
  int answer;
  unsigned int price;
  char* str;
  lua_State* L;

  /* Set up for the comm_get* functions. */
  ai_setPilot(comm_pilot);

  price = comm_getBribeAmount();

  /* Unbribeable. */
  if(price == 0) {
    str = comm_getBribeString("bribe_no");
    if(str == NULL)
      dialogue_msg("Bribe Pilot", "\"Money won't save your hide now!\"");
    else
      dialogue_msg("Bribe Pilot", "%s", str);
    return;
  }

  /* Bribe message. */
  str = comm_getBribeString("bribe_prompt");
  if(str == NULL) {
    answer = dialogue_YesNo("Bribe Pilot", "\"I'm gonna need at least %d credits to not leave \
        you as a hunk of floating debris.\"\n\nPay %d credits?", price, price);
  }
  else
    answer = dialogue_YesNo("Bribe Pilot", "%s\n\npay %d credits?", str, price);

  /* Said no. */
  if(answer == 0) {
    dialogue_msg("Bribe Pilot", "You decide not to pay.");
    return;
  }

  /* Check if has the money. */
  if(player->credits < price) {
    dialogue_msg("Bribe Pilot", "You don't have enough credits for the bribary.");
  } else {
    player->credits -= price;
    str = comm_getBribeString("bribe_paid");
    if(str == NULL)
      dialogue_msg("Bribe Pilot", "\"Pleasure to do business with you.\"");
    else
      dialogue_msg("Bribe Pilot", "%s", str);

    /* Mark as bribed and don't allow bribing again. */
    pilot_setFlag(comm_pilot, PILOT_BRIBED);
    L = comm_pilot->ai->L;
    lua_getglobal(L, "mem");
    lua_pushnil(L);
    lua_setfield(L, -2, "bribe");
    lua_pop(L, 1);

    /* Reopen window. */
    window_destroy(wid);
    comm_open(comm_pilot->id);
  }
}

/**
 * @brief Get the amount the communicating pilot wants as a bribe.
 * 
 * Note: It's a hack around the AI stuff, probably not too good of an idea.
 *    @return Amount pilot wants.
 */
static unsigned int comm_getBribeAmount(void) {
  lua_State* L;
  unsigned int bribe;

  /* Set up the state. */
  L = comm_pilot->ai->L;
  lua_getglobal(L, "mem");

  /* Get the bribe amount. */
  lua_getfield(L, -1, "bribe");

  /* If not number consider unbribeable. */
  if(!lua_isnumber(L, -1))
    bribe = 0;
  else
    bribe = (unsigned int)lua_tonumber(L, -1);
  lua_pop(L, 2);
  return bribe;
}

/**
 * @brief Get a string from the pilots memory.
 *
 * Valid targets are:
 *    -- bribe_no : Unbribe message.
 *    -- bribe_prompt : Bribe prompt.
 *    -- bribe_paid: paid message.
 *
 *    @param str String to get.
 *    @return String matching str.
 */
static char* comm_getBribeString(char* str) {
  lua_State* L;
  char* ret;

  /* Get memory table. */
  L = comm_pilot->ai->L;
  lua_getglobal(L, "mem");

  /* Get str message. */
  lua_getfield(L, -1, str);
  if(!lua_isstring(L, -1))
    ret = NULL;
  else
    ret = (char*) lua_tostring(L, -1);
  lua_pop(L, 2);

  return ret;
}