/** @file
  This module provide help function for displaying unicode string.

  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "UefiLibInternal.h"

typedef struct {
  CHAR16    WChar;
  UINT32    Width;
} UNICODE_WIDTH_ENTRY;

#define NARROW_CHAR  0xFFF0
#define WIDE_CHAR    0xFFF1

GLOBAL_REMOVE_IF_UNREFERENCED CONST UNICODE_WIDTH_ENTRY  mUnicodeWidthTable[] = {
  //
  // General script area
  //
  { (CHAR16)0x1FFF, 1 },

  /*
   * Merge the blocks and replace them with the above entry as they fall to
   * the same category and they are all narrow glyph. This will reduce search
   * time and table size. The merge will omit the reserved code.
   *
   * Remove the above item if below is un-commented.
   *
  {(CHAR16)0x007F,  1},       // C0 controls and basic Latin. 0x0000-0x007F
  {(CHAR16)0x00FF,  1},       // C1 controls and Latin-1 support. 0x0080-0x00FF
  {(CHAR16)0x017F,  1},       // Latin extended-A. 0x0100-0x017F
  {(CHAR16)0x024F,  1},       // Latin extended-B. 0x0180-0x024F
  {(CHAR16)0x02AF,  1},       // IPA extensions. 0x0250-0x02AF
  {(CHAR16)0x02FF,  1},       // Spacing modifier letters. 0x02B0-0x02FF
  {(CHAR16)0x036F,  1},       // Combining diacritical marks. 0x0300-0x036F
  {(CHAR16)0x03FF,  1},       // Greek. 0x0370-0x03FF
  {(CHAR16)0x04FF,  1},       // Cyrillic. 0x0400-0x04FF
  {(CHAR16)0x052F,  0},       // Unassigned. As Armenian in ver3.0. 0x0500-0x052F
  {(CHAR16)0x058F,  1},       // Armenian. 0x0530-0x058F
  {(CHAR16)0x05FF,  1},       // Hebrew. 0x0590-0x05FF
  {(CHAR16)0x06FF,  1},       // Arabic. 0x0600-0x06FF
  {(CHAR16)0x08FF,  0},       // Unassigned. 0x0700-0x08FF
  {(CHAR16)0x097F,  1},       // Devanagari. 0x0900-0x097F
  {(CHAR16)0x09FF,  1},       // Bengali. 0x0980-0x09FF
  {(CHAR16)0x0A7F,  1},       // Gurmukhi. 0x0A00-0x0A7F
  {(CHAR16)0x0AFF,  1},       // Gujarati. 0x0A80-0x0AFF
  {(CHAR16)0x0B7F,  1},       // Oriya. 0x0B00-0x0B7F
  {(CHAR16)0x0BFF,  1},       // Tamil. (See page 7-92). 0x0B80-0x0BFF
  {(CHAR16)0x0C7F,  1},       // Telugu. 0x0C00-0x0C7F
  {(CHAR16)0x0CFF,  1},       // Kannada. (See page 7-100). 0x0C80-0x0CFF
  {(CHAR16)0x0D7F,  1},       // Malayalam (See page 7-104). 0x0D00-0x0D7F
  {(CHAR16)0x0DFF,  0},       // Unassigned. 0x0D80-0x0DFF
  {(CHAR16)0x0E7F,  1},       // Thai. 0x0E00-0x0E7F
  {(CHAR16)0x0EFF,  1},       // Lao. 0x0E80-0x0EFF
  {(CHAR16)0x0FBF,  1},       // Tibetan. 0x0F00-0x0FBF
  {(CHAR16)0x109F,  0},       // Unassigned. 0x0FC0-0x109F
  {(CHAR16)0x10FF,  1},       // Georgian. 0x10A0-0x10FF
  {(CHAR16)0x11FF,  1},       // Hangul Jamo. 0x1100-0x11FF
  {(CHAR16)0x1DFF,  0},       // Unassigned. 0x1200-0x1DFF
  {(CHAR16)0x1EFF,  1},       // Latin extended additional. 0x1E00-0x1EFF
  {(CHAR16)0x1FFF,  1},       // Greek extended. 0x1F00-0x1FFF
  *
  */

  //
  // Symbol area
  //
  { (CHAR16)0x2FFF, 1 },

  /*
   * Merge the blocks and replace them with the above entry as they fall to
   * the same category and they are all narrow glyph. This will reduce search
   * time and table size. The merge will omit the reserved code.
   *
   * Remove the above item if below is un-commented.
   *
  {(CHAR16)0x206F,  1},       // General punctuation. (See page7-154). 0x200-0x206F
  {(CHAR16)0x209F,  1},       // Superscripts and subscripts. 0x2070-0x209F
  {(CHAR16)0x20CF,  1},       // Currency symbols. 0x20A0-0x20CF
  {(CHAR16)0x20FF,  1},       // Combining diacritical marks for symbols. 0x20D0-0x20FF
  {(CHAR16)0x214F,  1},       // Letterlike sympbols. 0x2100-0x214F
  {(CHAR16)0x218F,  1},       // Number forms. 0x2150-0x218F
  {(CHAR16)0x21FF,  1},       // Arrows. 0x2190-0x21FF
  {(CHAR16)0x22FF,  1},       // Mathematical operators. 0x2200-0x22FF
  {(CHAR16)0x23FF,  1},       // Miscellaneous technical. 0x2300-0x23FF
  {(CHAR16)0x243F,  1},       // Control pictures. 0x2400-0x243F
  {(CHAR16)0x245F,  1},       // Optical character recognition. 0x2440-0x245F
  {(CHAR16)0x24FF,  1},       // Enclosed alphanumerics. 0x2460-0x24FF
  {(CHAR16)0x257F,  1},       // Box drawing. 0x2500-0x257F
  {(CHAR16)0x259F,  1},       // Block elements. 0x2580-0x259F
  {(CHAR16)0x25FF,  1},       // Geometric shapes. 0x25A0-0x25FF
  {(CHAR16)0x26FF,  1},       // Miscellaneous symbols. 0x2600-0x26FF
  {(CHAR16)0x27BF,  1},       // Dingbats. 0x2700-0x27BF
  {(CHAR16)0x2FFF,  0},       // Reserved. 0x27C0-0x2FFF
  *
  */

  //
  // CJK phonetics and symbol area
  //
  { (CHAR16)0x33FF, 2 },

  /*
   * Merge the blocks and replace them with the above entry as they fall to
   * the same category and they are all wide glyph. This will reduce search
   * time and table size. The merge will omit the reserved code.
   *
   * Remove the above item if below is un-commented.
   *
  {(CHAR16)0x303F,  2},       // CJK symbols and punctuation. 0x3000-0x303F
  {(CHAR16)0x309F,  2},       // Hiragana. 0x3040-0x309F
  {(CHAR16)0x30FF,  2},       // Katakana. 0x30A0-0x30FF
  {(CHAR16)0x312F,  2},       // Bopomofo. 0x3100-0x312F
  {(CHAR16)0x318F,  2},       // Hangul compatibility jamo. 0x3130-0x318F
  {(CHAR16)0x319F,  2},       // Kanbun. 0x3190-0x319F
  {(CHAR16)0x31FF,  0},       // Reserved. As Bopomofo extended in ver3.0. 0x31A0-0x31FF
  {(CHAR16)0x32FF,  2},       // Enclosed CJK letters and months. 0x3200-0x32FF
  {(CHAR16)0x33FF,  2},       // CJK compatibility. 0x3300-0x33FF
  *
  */

  //
  // CJK ideograph area
  //
  { (CHAR16)0x9FFF, 2 },

  /*
   * Merge the blocks and replace them with the above entry as they fall to
   * the same category and they are all wide glyph. This will reduce search
   * time and table size. The merge will omit the reserved code.
   *
   * Remove the above item if below is un-commented.
   *
  {(CHAR16)0x4DFF,  0},       // Reserved. 0x3400-0x4DBF as CJK unified ideographs
                      // extension A in ver3.0. 0x3400-0x4DFF
  {(CHAR16)0x9FFF,  2},       // CJK unified ideographs. 0x4E00-0x9FFF
  *
  */

  //
  // Reserved
  //
  { (CHAR16)0xABFF, 0 },       // Reserved. 0xA000-0xA490 as Yi syllables. 0xA490-0xA4D0
  // as Yi radicals in ver3.0. 0xA000-0xABFF
  //
  // Hangul syllables
  //
  { (CHAR16)0xD7FF, 2 },

  /*
   * Merge the blocks and replace them with the above entry as they fall to
   * the same category and they are all wide glyph. This will reduce search
   * time and table size. The merge will omit the reserved code.
   *
   * Remove the above item if below is un-commented.
   *
  {(CHAR16)0xD7A3,  2},       // Hangul syllables. 0xAC00-0xD7A3
  {(CHAR16)0xD7FF,  0},       // Reserved. 0xD7A3-0xD7FF
  *
  */

  //
  // Surrogates area
  //
  { (CHAR16)0xDFFF, 0 },       // Surrogates, not used now. 0xD800-0xDFFF

  //
  // Private use area
  //
  { (CHAR16)0xF8FF, 0 },       // Private use area. 0xE000-0xF8FF

  //
  // Compatibility area and specials
  //
  { (CHAR16)0xFAFF, 2 },       // CJK compatibility ideographs. 0xF900-0xFAFF
  { (CHAR16)0xFB4F, 1 },       // Alphabetic presentation forms. 0xFB00-0xFB4F
  { (CHAR16)0xFDFF, 1 },       // Arabic presentation forms-A. 0xFB50-0xFDFF
  { (CHAR16)0xFE1F, 0 },       // Reserved. As variation selectors in ver3.0. 0xFE00-0xFE1F
  { (CHAR16)0xFE2F, 1 },       // Combining half marks. 0xFE20-0xFE2F
  { (CHAR16)0xFE4F, 2 },       // CJK compatibility forms. 0xFE30-0xFE4F
  { (CHAR16)0xFE6F, 1 },       // Small Form Variants. 0xFE50-0xFE6F
  { (CHAR16)0xFEFF, 1 },       // Arabic presentation forms-B. 0xFE70-0xFEFF
  { (CHAR16)0xFFEF, 1 },       // Half width and full width forms. 0xFF00-0xFFEF
  { (CHAR16)0xFFFF, 0 },       // Speicials. 0xFFF0-0xFFFF
};

/**
  Retrieves the width of a Unicode character.

  This function computes and returns the width of the Unicode character specified
  by UnicodeChar.

  @param  UnicodeChar   A Unicode character.

  @retval 0             The width if UnicodeChar could not be determined.
  @retval 1             UnicodeChar is a narrow glyph.
  @retval 2             UnicodeChar is a wide glyph.

**/
UINTN
EFIAPI
GetGlyphWidth (
  IN CHAR16  UnicodeChar
  )
{
  UINTN                      Index;
  UINTN                      Low;
  UINTN                      High;
  CONST UNICODE_WIDTH_ENTRY  *Item;

  Item = NULL;
  Low  = 0;
  High = (sizeof (mUnicodeWidthTable)) / (sizeof (UNICODE_WIDTH_ENTRY)) - 1;
  while (Low <= High) {
    Index = (Low + High) >> 1;
    Item  = &(mUnicodeWidthTable[Index]);
    if (Index == 0) {
      if (UnicodeChar <= Item->WChar) {
        break;
      }

      return 0;
    }

    if (UnicodeChar > Item->WChar) {
      Low = Index + 1;
    } else if (UnicodeChar <= mUnicodeWidthTable[Index - 1].WChar) {
      High = Index - 1;
    } else {
      //
      // Index - 1 < UnicodeChar <= Index. Found
      //
      break;
    }
  }

  if (Low <= High) {
    return Item->Width;
  }

  return 0;
}

/**
  Computes the display length of a Null-terminated Unicode String.

  This function computes and returns the display length of the Null-terminated
  Unicode string specified by String.  If String is NULL then 0 is returned. If
  any of the widths of the Unicode characters in String can not be determined,
  then 0 is returned. The display width of String can be computed by summing the
  display widths of each Unicode character in String.  Unicode characters that
  are narrow glyphs have a width of 1, and Unicode characters that are width glyphs
  have a width of 2.  If String is not aligned on a 16-bit boundary, then ASSERT().

  @param  String      A pointer to a Null-terminated Unicode string.

  @return The display length of the Null-terminated Unicode string specified by String.

**/
UINTN
EFIAPI
UnicodeStringDisplayLength (
  IN CONST CHAR16  *String
  )
{
  UINTN  Length;
  UINTN  Width;

  if (String == NULL) {
    return 0;
  }

  Length = 0;
  while (*String != 0) {
    Width = GetGlyphWidth (*String);
    if (Width == 0) {
      return 0;
    }

    Length += Width;
    String++;
  }

  return Length;
}

/**
  Count the storage space of a Unicode string.

  This function handles the Unicode string with NARROW_CHAR
  and WIDE_CHAR control characters. NARROW_HCAR and WIDE_CHAR
  does not count in the resultant output. If a WIDE_CHAR is
  hit, then 2 Unicode character will consume an output storage
  space with size of CHAR16 till a NARROW_CHAR is hit.

  @param String          The input string to be counted.
  @param LimitLen        Whether need to limit the string length.
  @param MaxWidth        The max length this function supported.
  @param Offset          The max index of the string can be show out.

  @return Storage space for the input string.

**/
UINTN
UefiLibGetStringWidth (
  IN  CHAR16   *String,
  IN  BOOLEAN  LimitLen,
  IN  UINTN    MaxWidth,
  OUT UINTN    *Offset
  )
{
  UINTN  Index;
  UINTN  Count;
  UINTN  IncrementValue;

  if (String == NULL) {
    return 0;
  }

  Index          = 0;
  Count          = 0;
  IncrementValue = 1;

  do {
    //
    // Advance to the null-terminator or to the first width directive
    //
    for ( ; (String[Index] != NARROW_CHAR) && (String[Index] != WIDE_CHAR) && (String[Index] != 0); Index++) {
      Count = Count + IncrementValue;

      if (LimitLen && (Count > MaxWidth)) {
        break;
      }
    }

    //
    // We hit the null-terminator, we now have a count
    //
    if (String[Index] == 0) {
      break;
    }

    if (LimitLen && (Count > MaxWidth)) {
      *Offset = Index;
      break;
    }

    //
    // We encountered a narrow directive - strip it from the size calculation since it doesn't get printed
    // and also set the flag that determines what we increment by.(if narrow, increment by 1, if wide increment by 2)
    //
    if (String[Index] == NARROW_CHAR) {
      //
      // Skip to the next character
      //
      Index++;
      IncrementValue = 1;
    } else {
      //
      // Skip to the next character
      //
      Index++;
      IncrementValue = 2;
    }
  } while (String[Index] != 0);

  return Count * sizeof (CHAR16);
}

/**
  Draws a dialog box to the console output device specified by
  ConOut defined in the EFI_SYSTEM_TABLE and waits for a keystroke
  from the console input device specified by ConIn defined in the
  EFI_SYSTEM_TABLE.

  If there are no strings in the variable argument list, then ASSERT().
  If all the strings in the variable argument list are empty, then ASSERT().

  @param[in]   Attribute  Specifies the foreground and background color of the popup.
  @param[out]  Key        A pointer to the EFI_KEY value of the key that was
                          pressed.  This is an optional parameter that may be NULL.
                          If it is NULL then no wait for a keypress will be performed.
  @param[in]  ...         The variable argument list that contains pointers to Null-
                          terminated Unicode strings to display in the dialog box.
                          The variable argument list is terminated by a NULL.

**/
VOID
EFIAPI
CreatePopUp (
  IN  UINTN          Attribute,
  OUT EFI_INPUT_KEY  *Key       OPTIONAL,
  ...
  )
{
  EFI_STATUS                       Status;
  VA_LIST                          Args;
  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *ConOut;
  EFI_SIMPLE_TEXT_OUTPUT_MODE      SavedConsoleMode;
  UINTN                            Columns;
  UINTN                            Rows;
  UINTN                            Column;
  UINTN                            Row;
  UINTN                            NumberOfLines;
  UINTN                            MaxLength;
  CHAR16                           *String;
  UINTN                            Length;
  CHAR16                           *Line;
  UINTN                            EventIndex;
  CHAR16                           *TmpString;

  //
  // Determine the length of the longest line in the popup and the the total
  // number of lines in the popup
  //
  VA_START (Args, Key);
  MaxLength     = 0;
  NumberOfLines = 0;
  while ((String = VA_ARG (Args, CHAR16 *)) != NULL) {
    MaxLength = MAX (MaxLength, UefiLibGetStringWidth (String, FALSE, 0, NULL) / 2);
    NumberOfLines++;
  }

  VA_END (Args);

  //
  // If the total number of lines in the popup is zero, then ASSERT()
  //
  ASSERT (NumberOfLines != 0);

  //
  // If the maximum length of all the strings is zero, then ASSERT()
  //
  ASSERT (MaxLength != 0);

  //
  // Cache a pointer to the Simple Text Output Protocol in the EFI System Table
  //
  ConOut = gST->ConOut;

  //
  // Save the current console cursor position and attributes
  //
  CopyMem (&SavedConsoleMode, ConOut->Mode, sizeof (SavedConsoleMode));

  //
  // Retrieve the number of columns and rows in the current console mode
  //
  ConOut->QueryMode (ConOut, SavedConsoleMode.Mode, &Columns, &Rows);

  //
  // Disable cursor and set the foreground and background colors specified by Attribute
  //
  ConOut->EnableCursor (ConOut, FALSE);
  ConOut->SetAttribute (ConOut, Attribute);

  //
  // Limit NumberOfLines to height of the screen minus 3 rows for the box itself
  //
  NumberOfLines = MIN (NumberOfLines, Rows - 3);

  //
  // Limit MaxLength to width of the screen minus 2 columns for the box itself
  //
  MaxLength = MIN (MaxLength, Columns - 2);

  //
  // Compute the starting row and starting column for the popup
  //
  Row    = (Rows - (NumberOfLines + 3)) / 2;
  Column = (Columns - (MaxLength + 2)) / 2;

  //
  // Allocate a buffer for a single line of the popup with borders and a Null-terminator
  //
  Line = AllocateZeroPool ((MaxLength + 3) * sizeof (CHAR16));

  if (Line == NULL) {
    ASSERT (Line != NULL);
    return;
  }

  //
  // Draw top of popup box
  //
  SetMem16 (Line, (MaxLength + 2) * 2, BOXDRAW_HORIZONTAL);
  Line[0]             = BOXDRAW_DOWN_RIGHT;
  Line[MaxLength + 1] = BOXDRAW_DOWN_LEFT;
  Line[MaxLength + 2] = L'\0';
  ConOut->SetCursorPosition (ConOut, Column, Row++);
  ConOut->OutputString (ConOut, Line);

  //
  // Draw middle of the popup with strings
  //
  VA_START (Args, Key);
  while ((String = VA_ARG (Args, CHAR16 *)) != NULL && NumberOfLines > 0) {
    SetMem16 (Line, (MaxLength + 2) * 2, L' ');
    Line[0]             = BOXDRAW_VERTICAL;
    Line[MaxLength + 1] = BOXDRAW_VERTICAL;
    Line[MaxLength + 2] = L'\0';
    ConOut->SetCursorPosition (ConOut, Column, Row);
    ConOut->OutputString (ConOut, Line);
    Length = UefiLibGetStringWidth (String, FALSE, 0, NULL) / 2;
    if (Length <= MaxLength) {
      //
      // Length <= MaxLength
      //
      ConOut->SetCursorPosition (ConOut, Column + 1 + (MaxLength - Length) / 2, Row++);
      ConOut->OutputString (ConOut, String);
    } else {
      //
      // Length > MaxLength
      //
      UefiLibGetStringWidth (String, TRUE, MaxLength, &Length);
      TmpString = AllocateZeroPool ((Length + 1) * sizeof (CHAR16));

      if (TmpString == NULL) {
        ASSERT (TmpString != NULL);
        break;
      }

      StrnCpyS (TmpString, Length + 1, String, Length - 3);
      StrCatS (TmpString, Length + 1, L"...");

      ConOut->SetCursorPosition (ConOut, Column + 1, Row++);
      ConOut->OutputString (ConOut, TmpString);
      FreePool (TmpString);
    }

    NumberOfLines--;
  }

  VA_END (Args);

  //
  // Draw bottom of popup box
  //
  SetMem16 (Line, (MaxLength + 2) * 2, BOXDRAW_HORIZONTAL);
  Line[0]             = BOXDRAW_UP_RIGHT;
  Line[MaxLength + 1] = BOXDRAW_UP_LEFT;
  Line[MaxLength + 2] = L'\0';
  ConOut->SetCursorPosition (ConOut, Column, Row++);
  ConOut->OutputString (ConOut, Line);

  //
  // Free the allocated line buffer
  //
  FreePool (Line);

  //
  // Restore the cursor visibility, position, and attributes
  //
  ConOut->EnableCursor (ConOut, SavedConsoleMode.CursorVisible);
  ConOut->SetCursorPosition (ConOut, SavedConsoleMode.CursorColumn, SavedConsoleMode.CursorRow);
  ConOut->SetAttribute (ConOut, SavedConsoleMode.Attribute);

  //
  // Wait for a keystroke
  //
  if (Key != NULL) {
    while (TRUE) {
      Status = gST->ConIn->ReadKeyStroke (gST->ConIn, Key);
      if (!EFI_ERROR (Status)) {
        break;
      }

      //
      // If we encounter error, continue to read another key in.
      //
      if (Status != EFI_NOT_READY) {
        continue;
      }

      gBS->WaitForEvent (1, &gST->ConIn->WaitForKey, &EventIndex);
    }
  }
}
