/*
* Descent 3 
* Copyright (C) 2024 Parallax Software
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.

--- HISTORICAL COMMENTS FOLLOW ---

 * $Logfile: /DescentIII/Main/win32/wincon.cpp $
 * $Revision: 11 $
 * $Date: 4/07/99 10:56a $
 * $Author: Matt $
 *
 *
 *
 * $Log: /DescentIII/Main/win32/wincon.cpp $
 *
 * 11    4/07/99 10:56a Matt
 * Fixed compile warning.
 *
 * 10    3/24/99 3:54p Jeff
 * handle backspaces in the Printf
 *
 * 9     11/01/98 1:58a Jeff
 * converted the vsprintf calls to use the Pvsprintf, which is a safe
 * vsprintf, no buffer overflows allowed
 *
 * 8     10/30/98 5:52p Jeff
 * implemented up arrow for last command, and esc to clear the line
 *
 * 7     10/24/98 2:18p Samir
 * make close box inactive.
 *
 * 6     10/21/98 4:49p Jeff
 * filter garbage out of strings to console
 *
 * 5     10/02/98 11:15a Jeff
 * added HBITMAP, HFONT and HBRUSH type casts where needed to satisfy the
 * compiler
 *
 * 4     9/16/98 6:39p Samir
 * make sure window isn't off screen.
 *
 * 3     9/16/98 6:24p Samir
 * slightly improved.
 *
 * 2     9/16/98 5:02p Samir
 * reimplemented X style console.
 *
 * 1     9/14/98 4:02p Samir
 * new console library.
 *
 * $NoKeywords: $
 */

#include <algorithm>
#include <cstdarg>
#include <cstdio>
#include <cstring>
#include <windows.h>

#include "Application.h"
#include "AppConsole.h"

#define CON_SCROLL_ROWS 25
#define CON_SCROLL_COLS 80

static bool Con_init = false;
static bool Con_newline = false;
static char *Con_buffer = NULL;
static int Con_row, Con_col;
static char Con_read_buf[CON_SCROLL_COLS + 4];
static char Con_inp_buf[CON_SCROLL_COLS + 4], Con_inp_pos = 0;
static char Con_last_command[CON_MAX_STRINGLEN];
static int Con_ch_w, Con_ch_h;
static HWND hConWnd = NULL;

void con_Create(HWND hWnd, LPCREATESTRUCT lpcs);
void con_Paint(HWND hWnd);
void con_Destroy(HWND hWnd);
void con_Puts(const char *str);
void con_Scroll();
int con_KeyDown(HWND hWnd, UINT vkey);
int con_Char(HWND hWnd, UINT vkey);

void con_Printf(const char *fmt, ...) {
  char buf[CON_MAX_STRINGLEN];
  std::va_list args;

  //	filter out messages
  va_start(args, fmt);
  std::vsnprintf(buf, CON_MAX_STRINGLEN, fmt, args);

  int len = strlen(buf);
  if (len >= CON_MAX_STRINGLEN) {
    // we overflowed our buffer!!!
    // we need to do some sort of error here!!!!
    buf[CON_MAX_STRINGLEN - 1] = '\0';
  }

  //	filter out unprintable characters
  char *p, *fp, filter_buf[CON_MAX_STRINGLEN];
  p = buf;
  fp = filter_buf;

  while (*p) {
    if (*p == 0x01) {
      // this is a color, skip the next 3
      p += 4;
    } else {
      if (isalnum(*p) || ispunct(*p) || (*p == ' ') || (*p == '\n') || (*p == '\r') || (*p == '\b')) {
        *fp = *p;
        fp++;
      }
      p++;
    }
  }
  *fp = '\0';

  con_Puts(filter_buf);

  if (hConWnd) {
    InvalidateRect(hConWnd, NULL, TRUE);
    UpdateWindow(hConWnd);
  }
}

bool con_Input(char *buf, int buflen) {
  if (Con_read_buf[0]) {
    strncpy(buf, Con_read_buf, buflen - 1);
    buf[buflen - 1] = 0;
    Con_read_buf[0] = 0;
    return true;
  }

  return false;
}

void con_Defer() {
  if (Con_newline) {
    Con_newline = false;
    con_Puts("%");
    if (hConWnd) {
      InvalidateRect(hConWnd, NULL, TRUE);
      UpdateWindow(hConWnd);
    }
  }
}

// console window.
LRESULT WINAPI MyConProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
  HDC hdc;

  switch (msg) {
  case WM_CREATE: {
    LPCREATESTRUCT lpcs = (LPCREATESTRUCT)lParam;
    con_Create(hWnd, lpcs);
    break;
  }

  case WM_PAINT:
    con_Paint(hWnd);
    break;

  case WM_SYSCOMMAND:
    if (wParam == SC_CLOSE) {
      return 0;
    }
    break;

  case WM_SETFOCUS: {
    // The window has the input focus. Load the
    // application-defined caret resource.
    HFONT oldfont;

    hdc = GetDC(hWnd);

    oldfont = (HFONT)SelectObject(hdc, (HFONT)GetStockObject(ANSI_FIXED_FONT));
    SelectObject(hdc, oldfont);
    CreateCaret(hWnd, NULL, Con_ch_w, Con_ch_h);
    SetCaretPos(Con_col * Con_ch_w, Con_row * Con_ch_h);
    ShowCaret(hWnd);

    ReleaseDC(hWnd, hdc);
    break;
  }

  case WM_KILLFOCUS:
    // The window is losing the input focus,
    // so destroy the caret.
    DestroyCaret();
    break;

  case WM_KEYDOWN:
    return con_KeyDown(hWnd, wParam);

  case WM_CHAR:
    return con_Char(hWnd, wParam);
  }

  return DefWindowProc(hWnd, msg, wParam, lParam);
}

// console window helper functions
void con_Create(HWND hWnd, LPCREATESTRUCT lpcs) {
  oeWin32Application *app = (oeWin32Application *)lpcs->lpCreateParams;
  HDC hdc;
  HFONT oldfont;
  RECT rect;
  TEXTMETRIC tm;

  // create console region
  Con_row = 0;
  Con_col = 0;
  Con_buffer = new char[CON_SCROLL_ROWS * (CON_SCROLL_COLS + 1)];
  Con_read_buf[0] = 0;
  Con_inp_pos = 0;
  memset(Con_inp_buf, 0, sizeof(Con_inp_buf));
  memset(Con_buffer, 0, CON_SCROLL_ROWS * (CON_SCROLL_COLS + 1));
  memset(Con_last_command, 0, sizeof(Con_last_command));

  con_Puts("Outrage PC Console v1.0\n");

  Con_newline = true;

  // get font width and height
  hdc = GetDC(hWnd);
  oldfont = (HFONT)SelectObject(hdc, (HFONT)GetStockObject(ANSI_FIXED_FONT));
  GetTextMetrics(hdc, &tm);
  Con_ch_w = tm.tmMaxCharWidth;
  Con_ch_h = tm.tmHeight;
  rect.left = lpcs->x;
  rect.top = lpcs->y;
  rect.right = rect.left + Con_ch_w * CON_SCROLL_COLS;
  rect.bottom = rect.top + Con_ch_h * CON_SCROLL_ROWS;

  AdjustWindowRect(&rect, lpcs->style, FALSE);
  MoveWindow(hWnd, lpcs->x, lpcs->y, rect.right - rect.left, rect.bottom - rect.top, TRUE);

  app->m_X = lpcs->x;
  app->m_Y = lpcs->y;
  app->m_W = rect.right - rect.left;
  app->m_H = rect.bottom - rect.top;

  SelectObject(hdc, oldfont);
  ReleaseDC(hWnd, hdc);

  EnableMenuItem(GetSystemMenu(hWnd, FALSE), SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);

  hConWnd = hWnd;
}

void con_Paint(HWND hWnd) {
  PAINTSTRUCT ps;
  HDC hdc = BeginPaint(hWnd, &ps);
  int i;
  HFONT hfont;

  // use a fixed font.
  hfont = (HFONT)SelectObject(hdc, (HFONT)GetStockObject(ANSI_FIXED_FONT));

  // draw buffer at 0 to Con_row to end of buffer.
  for (i = 0; i < CON_SCROLL_ROWS; i++) {
    char *ptr = &Con_buffer[i * (CON_SCROLL_COLS + 1)];
    TextOut(hdc, 0, i * Con_ch_h, ptr, strlen(ptr));
  }

  // end
  SelectObject(hdc, hfont);
  EndPaint(hWnd, &ps);
}

void con_Destroy(HWND hWnd) {
  if (Con_buffer)
    delete[] Con_buffer;

  hConWnd = NULL;
}

void con_Puts(const char *str) {
  int i, len = strlen(str);
  char *row = &Con_buffer[Con_row * (CON_SCROLL_COLS + 1)];
  bool endline = false;

  for (i = 0; i < len; i++) {
    switch (str[i]) {
    case '\n':
      endline = true;
      break;
    case '\b':
      if (Con_col > 0) {
        row[Con_col] = ' ';
        Con_col--;
      }
      break;
    default:
      row[Con_col] = str[i];
      Con_col++;
      break;
    }

    if (Con_col == CON_SCROLL_COLS) {
      endline = true;
    }

    if (endline) {
      Con_row++;
      if (Con_row == CON_SCROLL_ROWS) {
        con_Scroll();
        Con_row--;
      }
      row = &Con_buffer[Con_row * (CON_SCROLL_COLS + 1)];
      memset(row, 0, CON_SCROLL_COLS + 1);
      Con_col = 0;
      endline = false;
    }
  }

  SetCaretPos(Con_ch_w * Con_col, Con_ch_h * Con_row);
}

void con_Scroll() {
  int i;

  for (i = 1; i < CON_SCROLL_ROWS; i++)
    memcpy(&Con_buffer[(i - 1) * (CON_SCROLL_COLS + 1)], &Con_buffer[i * (CON_SCROLL_COLS + 1)], CON_SCROLL_COLS + 1);
  memset(&Con_buffer[(i - 1) * (CON_SCROLL_COLS + 1)], 0, CON_SCROLL_COLS + 1);
}

int con_KeyDown(HWND hWnd, UINT vkey) {
  // HDC hdc;
  int x;
  char *ptr = &Con_buffer[Con_row * (CON_SCROLL_COLS + 1)];

  switch (vkey) {
  case VK_LEFT: // Left arrow
    Con_col = std::max(Con_col - 1, 0);
    Con_inp_pos = std::max(Con_inp_pos - 1, 0);
    break;

  case VK_RIGHT: // Right arrow
    Con_col = std::min(Con_col + 1, CON_SCROLL_COLS - 1);
    Con_inp_pos = std::min(Con_inp_pos + 1, CON_SCROLL_COLS - 1);
    break;

  case VK_UP: // Up arrow
    // Replace the current buffer that is being typed with the last completed command (if there was one)
    if (Con_last_command[0] != 0) {
      memset(Con_inp_buf, 0, sizeof(Con_inp_buf));

      strcpy(Con_inp_buf, Con_last_command);

      ptr[0] = '%';
      strcpy(&ptr[1], Con_last_command); // add for %

      Con_inp_pos = strlen(Con_last_command);
      Con_col = Con_inp_pos + 1; // add for % prompt

      // The application will draw outside the
      // WM_PAINT message processing, so hide the caret.
      HideCaret(hWnd);

      // Redraw the line, adjusted for the
      // deleted character.
      InvalidateRect(hWnd, NULL, TRUE);
      UpdateWindow(hWnd);

      // Display the caret.
      ShowCaret(hWnd);
    }
    break;

  case VK_DELETE: // Delete
                  // Move all the characters that followed the
                  // deleted character (on the same line) one
                  // space back (to the left) in the matrix.
    for (x = Con_inp_pos; x < CON_SCROLL_COLS; x++)
      Con_inp_buf[x] = Con_inp_buf[x + 1];

    for (x = Con_col; x < CON_SCROLL_COLS; x++)
      ptr[x] = ptr[x + 1];

    // The application will draw outside the
    // WM_PAINT message processing, so hide the caret.
    HideCaret(hWnd);

    // Redraw the line, adjusted for the
    // deleted character.
    InvalidateRect(hWnd, NULL, TRUE);
    UpdateWindow(hWnd);

    // Display the caret.
    ShowCaret(hWnd);
    break;
  }

  // Adjust the caret position based on the
  // virtual-key processing.
  SetCaretPos(Con_ch_w * Con_col, Con_ch_h * Con_row);

  return 0;
}

int con_Char(HWND hWnd, UINT vkey) {
  HDC hdc;
  char *ptr = &Con_buffer[Con_row * (CON_SCROLL_COLS + 1)];

  switch (vkey) {
  case 0x08: // Backspace
             // Move the caret back one space, and then
             // process this like the DEL key.
    if (Con_inp_pos > 0)
      Con_inp_pos--;

    if (Con_col > 0) {
      Con_col--;
      SendMessage(hWnd, WM_KEYDOWN, VK_DELETE, 1L);
    }
    break;

  case 0x0D: // Carriage return
  {
    // Go to the beginning of the next line.
    // The bottom line wraps around to the top.
    strcpy(Con_read_buf, Con_inp_buf);
    Con_col = 0;
    Con_row++;
    if (Con_row == CON_SCROLL_ROWS) {
      con_Scroll();
      Con_row--;
    }
    ptr = &Con_buffer[Con_row * (CON_SCROLL_COLS + 1)];
    memset(ptr, 0, CON_SCROLL_COLS + 1);

    // only save the buffer if there is text in the buffer
    char *p = Con_inp_buf;
    while (*p) {
      if (isalnum(*p)) {
        strcpy(Con_last_command, Con_inp_buf);
        break;
      }
      p++;
    }

    memset(Con_inp_buf, 0, sizeof(Con_inp_buf));
    Con_inp_pos = 0;
    //		con_Printf("Command is %s.\n", Con_read_buf);
    Con_newline = true;
  } break;

  case 0x1B: // Escape
  {
    memset(Con_inp_buf, 0, sizeof(Con_inp_buf));
    memset(ptr, 0, CON_SCROLL_COLS + 1);

    ptr[0] = '%';

    Con_inp_pos = 0;
    Con_col = 1; // for % sign

    // The application will draw outside the
    // WM_PAINT message processing, so hide the caret.
    HideCaret(hWnd);

    // Redraw the line, adjusted for the
    // deleted character.
    InvalidateRect(hWnd, NULL, TRUE);
    UpdateWindow(hWnd);

    // Display the caret.
    ShowCaret(hWnd);

  } break;
  case 0x0A: // Linefeed
    break;

  default:
    if (Con_inp_pos < (CON_SCROLL_COLS - 2)) {
      // Add the character to the text buffer.
      int oldcol = Con_col, oldrow = Con_row;
      char str[2];

      str[0] = (char)vkey;
      str[1] = 0;

      con_Puts(str);
      Con_inp_buf[Con_inp_pos] = (char)vkey;

      // The application will draw outside the
      // WM_PAINT message processing, so hide the caret.
      HideCaret(hWnd);

      // Draw the character on the screen.
      hdc = GetDC(hWnd);
      SelectObject(hdc, GetStockObject(ANSI_FIXED_FONT));
      TextOut(hdc, Con_ch_w * oldcol, Con_ch_h * oldrow, str, 1);
      ReleaseDC(hWnd, hdc);

      // Display the caret.
      ShowCaret(hWnd);
      Con_inp_pos++;
    }

    break;
  }

  SetCaretPos(Con_col * Con_ch_w, Con_row * Con_ch_h);

  return 0;
}