import os
import re
from subprocess import (check_output, STDOUT, CalledProcessError)
from .error import KiPlotConfigurationError
from .misc import (KICAD2STEP, KICAD2STEP_ERR)
from .kiplot import (GS)
from kiplot.macros import macros, document, output_class  # noqa: F401
from . import log

logger = log.get_logger(__name__)


@output_class
class STEP(BaseOutput):  # noqa: F821
    """ STEP (ISO 10303-21 Clear Text Encoding of the Exchange Structure)
        Exports the PCB as a 3D model.
        This is the most common 3D format for exchange purposes.
        This output is what you get from the 'File/Export/STEP' menu in pcbnew. """
    def __init__(self, name, type, description):
        super(STEP, self).__init__(name, type, description)
        # Options
        with document:
            self.metric_units = True
            """ use metric units instead of inches. """
            self._origin = 'grid'
            """ determines the coordinates origin. Using grid the coordinates are the same as you have in the design sheet.
                The drill option uses the auxiliar reference defined by the user.
                You can define any other origin using the format 'X,Y', i.e. '3.2,-10' """
            self.no_virtual = False
            """ used to exclude 3D models for components with 'virtual' attribute """
            self.min_distance = -1
            """ the minimum distance between points to treat them as separate ones (-1 is KiCad default: 0.01 mm) """
            self.output = ''
            """ name for the generated STEP file (the name of the PCB if empty) """  # pragma: no cover

    @property
    def origin(self):
        return self._origin

    @origin.setter
    def origin(self, val):
        if (val not in ['grid', 'drill']) and (re.match(r'[-\d\.]+\s*,\s*[-\d\.]+\s*$', val) is None):
            raise KiPlotConfigurationError('Origin must be `grid` or `drill` or `X,Y`')
        self._origin = val

    def run(self, output_dir, board):
        # Output file name
        output = self.output
        if not output:
            output = os.path.splitext(os.path.basename(GS.pcb_file))[0]+'.step'
        output = os.path.abspath(os.path.join(output_dir, output))
        # Make units explicit
        if self.metric_units:
            units = 'mm'
        else:
            units = 'in'
        # Base command with overwrite
        cmd = [KICAD2STEP, '-o', output, '-f']
        # Add user options
        if self.no_virtual:
            cmd.append('--no-virtual')
        if self.min_distance >= 0:
            cmd.extend(['--min-distance', "{}{}".format(self.min_distance, units)])
        if self.origin == 'drill':
            cmd.append('--drill-origin')
        elif self.origin == 'grid':
            cmd.append('--grid-origin')
        else:
            cmd.extend(['--user-origin', "{}{}".format(self.origin.replace(',', 'x'), units)])
        # The board
        cmd.append(GS.pcb_file)
        # Execute and inform is successful
        logger.debug('Executing: '+str(cmd))
        try:
            cmd_output = check_output(cmd, stderr=STDOUT)
        except CalledProcessError as e:  # pragma: no cover
            # Current kicad2step always returns 0!!!!
            # This is why I'm excluding it from coverage
            logger.error('Failed to create Step file, error %d', e.returncode)
            if e.output:
                logger.debug('Output from command: '+e.output.decode())
            exit(KICAD2STEP_ERR)
        logger.debug('Output from command:\n'+cmd_output.decode())