/**
 * Created by nuintun on 2015/11/24.
 */

'use strict';

module.exports = function (Terminal){
  // CSI Pm m Character Attributes (SGR).
  // Ps = 0 -> Normal (default).
  // Ps = 1 -> Bold.
  // Ps = 4 -> Underlined.
  // Ps = 5 -> Blink (appears as Bold).
  // Ps = 7 -> Inverse.
  // Ps = 8 -> Invisible, i.e., hidden (VT300).
  // Ps = 2 2 -> Normal (neither bold nor faint).
  // Ps = 2 4 -> Not underlined.
  // Ps = 2 5 -> Steady (not blinking).
  // Ps = 2 7 -> Positive (not inverse).
  // Ps = 2 8 -> Visible, i.e., not hidden (VT300).
  // Ps = 3 0 -> Set foreground color to Black.
  // Ps = 3 1 -> Set foreground color to Red.
  // Ps = 3 2 -> Set foreground color to Green.
  // Ps = 3 3 -> Set foreground color to Yellow.
  // Ps = 3 4 -> Set foreground color to Blue.
  // Ps = 3 5 -> Set foreground color to Magenta.
  // Ps = 3 6 -> Set foreground color to Cyan.
  // Ps = 3 7 -> Set foreground color to White.
  // Ps = 3 9 -> Set foreground color to default (original).
  // Ps = 4 0 -> Set background color to Black.
  // Ps = 4 1 -> Set background color to Red.
  // Ps = 4 2 -> Set background color to Green.
  // Ps = 4 3 -> Set background color to Yellow.
  // Ps = 4 4 -> Set background color to Blue.
  // Ps = 4 5 -> Set background color to Magenta.
  // Ps = 4 6 -> Set background color to Cyan.
  // Ps = 4 7 -> Set background color to White.
  // Ps = 4 9 -> Set background color to default (original).

  // If 16-color support is compiled, the following apply. Assume
  // that xterm's resources are set so that the ISO color codes are
  // the first 8 of a set of 16. Then the aixterm colors are the
  // bright versions of the ISO colors:
  // Ps = 9 0 -> Set foreground color to Black.
  // Ps = 9 1 -> Set foreground color to Red.
  // Ps = 9 2 -> Set foreground color to Green.
  // Ps = 9 3 -> Set foreground color to Yellow.
  // Ps = 9 4 -> Set foreground color to Blue.
  // Ps = 9 5 -> Set foreground color to Magenta.
  // Ps = 9 6 -> Set foreground color to Cyan.
  // Ps = 9 7 -> Set foreground color to White.
  // Ps = 1 0 0 -> Set background color to Black.
  // Ps = 1 0 1 -> Set background color to Red.
  // Ps = 1 0 2 -> Set background color to Green.
  // Ps = 1 0 3 -> Set background color to Yellow.
  // Ps = 1 0 4 -> Set background color to Blue.
  // Ps = 1 0 5 -> Set background color to Magenta.
  // Ps = 1 0 6 -> Set background color to Cyan.
  // Ps = 1 0 7 -> Set background color to White.

  // If xterm is compiled with the 16-color support disabled, it
  // supports the following, from rxvt:
  // Ps = 1 0 0 -> Set foreground and background color to
  // default.

  // If 88- or 256-color support is compiled, the following apply.
  // Ps = 3 8 ; 5 ; Ps -> Set foreground color to the second
  // Ps.
  // Ps = 4 8 ; 5 ; Ps -> Set background color to the second
  // Ps.
  Terminal.prototype.charAttributes = function (params){
    var l = params.length,
      i = 0,
      bg, fg, p;

    for (; i < l; i++) {
      p = params[i];
      if (p >= 30 && p <= 37) {
        // fg color 8
        this.curAttr = (this.curAttr & ~(0x1ff << 9)) | ((p - 30) << 9);
      } else if (p >= 40 && p <= 47) {
        // bg color 8
        this.curAttr = (this.curAttr & ~0x1ff) | (p - 40);
      } else if (p >= 90 && p <= 97) {
        // fg color 16
        p += 8;
        this.curAttr = (this.curAttr & ~(0x1ff << 9)) | ((p - 90) << 9);
      } else if (p >= 100 && p <= 107) {
        // bg color 16
        p += 8;
        this.curAttr = (this.curAttr & ~0x1ff) | (p - 100);
      } else if (p === 0) {
        // default
        this.curAttr = this.defAttr;
      } else if (p === 1) {
        // bold text
        this.curAttr = this.curAttr | (1 << 18);
      } else if (p === 4) {
        // underlined text
        this.curAttr = this.curAttr | (2 << 18);
      } else if (p === 7 || p === 27) {
        // inverse and positive
        // test with: echo -e '\e[31m\e[42mhello\e[7mworld\e[27mhi\e[m'
        if (p === 7) {
          if ((this.curAttr >> 18) & 4) continue;
          this.curAttr = this.curAttr | (4 << 18);
        } else if (p === 27) {
          if (~(this.curAttr >> 18) & 4) continue;
          this.curAttr = this.curAttr & ~(4 << 18);
        }

        bg = this.curAttr & 0x1ff;
        fg = (this.curAttr >> 9) & 0x1ff;

        this.curAttr = (this.curAttr & ~0x3ffff) | ((bg << 9) | fg);
      } else if (p === 22) {
        // not bold
        this.curAttr = this.curAttr & ~(1 << 18);
      } else if (p === 24) {
        // not underlined
        this.curAttr = this.curAttr & ~(2 << 18);
      } else if (p === 39) {
        // reset fg
        this.curAttr = this.curAttr & ~(0x1ff << 9);
        this.curAttr = this.curAttr | (((this.defAttr >> 9) & 0x1ff) << 9);
      } else if (p === 49) {
        // reset bg
        this.curAttr = this.curAttr & ~0x1ff;
        this.curAttr = this.curAttr | (this.defAttr & 0x1ff);
      } else if (p === 38) {
        // fg color 256
        if (params[i + 1] !== 5) continue;
        i += 2;
        p = params[i] & 0xff;
        // convert 88 colors to 256
        // if (this.is('rxvt-unicode') && p < 88) p = p * 2.9090 | 0;
        this.curAttr = (this.curAttr & ~(0x1ff << 9)) | (p << 9);
      } else if (p === 48) {
        // bg color 256
        if (params[i + 1] !== 5) continue;
        i += 2;
        p = params[i] & 0xff;
        // convert 88 colors to 256
        // if (this.is('rxvt-unicode') && p < 88) p = p * 2.9090 | 0;
        this.curAttr = (this.curAttr & ~0x1ff) | p;
      }
    }
  };
};