#  -*- coding: utf-8 -*-
""" Set of ESC/POS Commands (Constants)

This module contains constants that are described in the esc/pos-documentation.
Since there is no definitive and unified specification for all esc/pos-like printers the constants could later be
moved to `capabilities` as in `escpos-php by @mike42 <https://github.com/mike42/escpos-php>`_.

:author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
"""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import six

# Control characters
# as labelled in http://www.novopos.ch/client/EPSON/TM-T20/TM-T20_eng_qr.pdf
NUL = b'\x00'
EOT = b'\x04'
ENQ = b'\x05'
DLE = b'\x10'
DC4 = b'\x14'
CAN = b'\x18'
ESC = b'\x1b'
FS  = b'\x1c'
GS  = b'\x1d'

# Feed control sequences
CTL_LF = b'\n'              # Print and line feed
CTL_FF = b'\f'              # Form feed
CTL_CR = b'\r'              # Carriage return
CTL_HT = b'\t'              # Horizontal tab
CTL_SET_HT = ESC + b'\x44'  # Set horizontal tab positions
CTL_VT = b'\v'              # Vertical tab

# Printer hardware
HW_INIT   = ESC + b'@'             # Clear data in buffer and reset modes
HW_SELECT = ESC + b'=\x01'         # Printer select

HW_RESET  = ESC + b'\x3f\x0a\x00'   # Reset printer hardware
                                    # (TODO: Where is this specified?)

# Cash Drawer (ESC p <pin> <on time: 2*ms> <off time: 2*ms>)
_CASH_DRAWER = lambda m, t1='', t2='': ESC + b'p' + m + six.int2byte(t1) + six.int2byte(t2)
CD_KICK_2 = _CASH_DRAWER(b'\x00', 50, 50)  # Sends a pulse to pin 2 []
CD_KICK_5 = _CASH_DRAWER(b'\x01', 50, 50)  # Sends a pulse to pin 5 []

# Paper Cutter
_CUT_PAPER = lambda m: GS + b'V' + m
PAPER_FULL_CUT = _CUT_PAPER(b'\x00')  # Full cut paper
PAPER_PART_CUT = _CUT_PAPER(b'\x01')  # Partial cut paper

# Beep
BEEP = b'\x07'

# Panel buttons (e.g. the FEED button)
_PANEL_BUTTON = lambda n: ESC + b'c5' + six.int2byte(n)
PANEL_BUTTON_ON = _PANEL_BUTTON(0)  # enable all panel buttons
PANEL_BUTTON_OFF = _PANEL_BUTTON(1)  # disable all panel buttons

# Sheet modes
SHEET_SLIP_MODE = ESC + b'\x63\x30\x04'  # slip paper
SHEET_ROLL_MODE = ESC + b'\x63\x30\x01'  # paper roll

# Text format
# TODO: Acquire the "ESC/POS Application Programming Guide for Paper Roll
#       Printers" and tidy up this stuff too.
TXT_FLIP_ON    = ESC + b'\x7b\x01'
TXT_FLIP_OFF   = ESC + b'\x7b\x00'
TXT_SMOOTH_ON  = GS + b'\x62\x01'
TXT_SMOOTH_OFF = GS + b'\x62\x00'
TXT_SIZE       = GS + b'!'
TXT_WIDTH      = {1: 0x00,
                  2: 0x10,
                  3: 0x20,
                  4: 0x30,
                  5: 0x40,
                  6: 0x50,
                  7: 0x60,
                  8: 0x70}
TXT_HEIGHT     = {1: 0x00,
                  2: 0x01,
                  3: 0x02,
                  4: 0x03,
                  5: 0x04,
                  6: 0x05,
                  7: 0x06,
                  8: 0x07}
TXT_NORMAL     = ESC + b'!\x00'     # Normal text
TXT_2HEIGHT    = ESC + b'!\x10'     # Double height text
TXT_2WIDTH     = ESC + b'!\x20'     # Double width text
TXT_4SQUARE    = ESC + b'!\x30'     # Quad area text
TXT_UNDERL_OFF = ESC + b'\x2d\x00'  # Underline font OFF
TXT_UNDERL_ON  = ESC + b'\x2d\x01'  # Underline font 1-dot ON
TXT_UNDERL2_ON = ESC + b'\x2d\x02'  # Underline font 2-dot ON
TXT_BOLD_OFF   = ESC + b'\x45\x00'  # Bold font OFF
TXT_BOLD_ON    = ESC + b'\x45\x01'  # Bold font ON
TXT_ALIGN_LT   = ESC + b'\x61\x00'  # Left justification
TXT_ALIGN_CT   = ESC + b'\x61\x01'  # Centering
TXT_ALIGN_RT   = ESC + b'\x61\x02'  # Right justification
TXT_INVERT_ON  = GS  + b'\x42\x01'  # Inverse Printing ON
TXT_INVERT_OFF = GS  + b'\x42\x00'  # Inverse Printing OFF

# Fonts
SET_FONT = lambda n: ESC + b'\x4d' + n
TXT_FONT_A     = SET_FONT(b'\x00')  # Font type A
TXT_FONT_B     = SET_FONT(b'\x01')  # Font type B

# Text colors
TXT_COLOR_BLACK = ESC + b'\x72\x00'  # Default Color
TXT_COLOR_RED = ESC + b'\x72\x01'    # Alternative Color (Usually Red)

# Spacing
LINESPACING_RESET = ESC + b'2'
LINESPACING_FUNCS = {
  60: ESC + b'A',  # line_spacing/60 of an inch, 0 <= line_spacing <= 85
  360: ESC + b'+', # line_spacing/360 of an inch, 0 <= line_spacing <= 255
  180: ESC + b'3', # line_spacing/180 of an inch, 0 <= line_spacing <= 255
}

# Prefix to change the codepage. You need to attach a byte to indicate
# the codepage to use. We use escpos-printer-db as the data source.
CODEPAGE_CHANGE = ESC + b'\x74'

# Barcode format
_SET_BARCODE_TXT_POS = lambda n: GS + b'H' + n
BARCODE_TXT_OFF = _SET_BARCODE_TXT_POS(b'\x00')  # HRI barcode chars OFF
BARCODE_TXT_ABV = _SET_BARCODE_TXT_POS(b'\x01')  # HRI barcode chars above
BARCODE_TXT_BLW = _SET_BARCODE_TXT_POS(b'\x02')  # HRI barcode chars below
BARCODE_TXT_BTH = _SET_BARCODE_TXT_POS(b'\x03')  # HRI both above and below

_SET_HRI_FONT = lambda n: GS + b'f' + n
BARCODE_FONT_A = _SET_HRI_FONT(b'\x00')  # Font type A for HRI barcode chars
BARCODE_FONT_B = _SET_HRI_FONT(b'\x01')  # Font type B for HRI barcode chars

BARCODE_HEIGHT = GS + b'h'  # Barcode Height [1-255]
BARCODE_WIDTH  = GS + b'w'  # Barcode Width  [2-6]

# NOTE: This isn't actually an ESC/POS command. It's the common prefix to the
#      two "print bar code" commands:
#      -  Type A: "GS k <type as integer> <data> NUL"
#      -  TYPE B: "GS k <type as letter> <data length> <data>"
#      The latter command supports more barcode types
_SET_BARCODE_TYPE = lambda m: GS + b'k' + six.int2byte(m)

# Barcodes for printing function type A
BARCODE_TYPE_A = {
    'UPC-A':   _SET_BARCODE_TYPE(0),
    'UPC-E':   _SET_BARCODE_TYPE(1),
    'EAN13':   _SET_BARCODE_TYPE(2),
    'EAN8':    _SET_BARCODE_TYPE(3),
    'CODE39':  _SET_BARCODE_TYPE(4),
    'ITF':     _SET_BARCODE_TYPE(5),
    'NW7':     _SET_BARCODE_TYPE(6),
    'CODABAR': _SET_BARCODE_TYPE(6),  # Same as NW7
}

# Barcodes for printing function type B
# The first 8 are the same barcodes as type A
BARCODE_TYPE_B = {
    'UPC-A':                       _SET_BARCODE_TYPE(65),
    'UPC-E':                       _SET_BARCODE_TYPE(66),
    'EAN13':                       _SET_BARCODE_TYPE(67),
    'EAN8':                        _SET_BARCODE_TYPE(68),
    'CODE39':                      _SET_BARCODE_TYPE(69),
    'ITF':                         _SET_BARCODE_TYPE(70),
    'NW7':                         _SET_BARCODE_TYPE(71),
    'CODABAR':                     _SET_BARCODE_TYPE(71),  # Same as NW7
    'CODE93':                      _SET_BARCODE_TYPE(72),
    'CODE128':                     _SET_BARCODE_TYPE(73),
    'GS1-128':                     _SET_BARCODE_TYPE(74),
    'GS1 DATABAR OMNIDIRECTIONAL': _SET_BARCODE_TYPE(75),
    'GS1 DATABAR TRUNCATED':       _SET_BARCODE_TYPE(76),
    'GS1 DATABAR LIMITED':         _SET_BARCODE_TYPE(77),
    'GS1 DATABAR EXPANDED':        _SET_BARCODE_TYPE(78),
}

BARCODE_TYPES = {
    'A': BARCODE_TYPE_A,
    'B': BARCODE_TYPE_B,
}

# QRCode error correction levels
QR_ECLEVEL_L = 0
QR_ECLEVEL_M = 1
QR_ECLEVEL_Q = 2
QR_ECLEVEL_H = 3

# QRcode models
QR_MODEL_1 = 1
QR_MODEL_2 = 2
QR_MICRO = 3

# Image format
# NOTE: _PRINT_RASTER_IMG is the obsolete ESC/POS "print raster bit image"
#       command. The constants include a fragment of the data's header.
_PRINT_RASTER_IMG = lambda data: GS + b'v0' + data
S_RASTER_N  = _PRINT_RASTER_IMG(b'\x00')  # Set raster image normal size
S_RASTER_2W = _PRINT_RASTER_IMG(b'\x01')  # Set raster image double width
S_RASTER_2H = _PRINT_RASTER_IMG(b'\x02')  # Set raster image double height
S_RASTER_Q  = _PRINT_RASTER_IMG(b'\x03')  # Set raster image quadruple

# Printing Density
PD_N50 = GS + b'\x7c\x00'  # Printing Density -50%
PD_N37 = GS + b'\x7c\x01'  # Printing Density -37.5%
PD_N25 = GS + b'\x7c\x02'  # Printing Density -25%
PD_N12 = GS + b'\x7c\x03'  # Printing Density -12.5%
PD_0   = GS + b'\x7c\x04'  # Printing Density  0%
PD_P50 = GS + b'\x7c\x08'  # Printing Density +50%
PD_P37 = GS + b'\x7c\x07'  # Printing Density +37.5%
PD_P25 = GS + b'\x7c\x06'  # Printing Density +25%
PD_P12 = GS + b'\x7c\x05'  # Printing Density +12.5%