#! /usr/bin/env python
# -*- coding: utf-8 -*-

# Copyright 2013-2014 Paulo Henrique Silva <ph.silva@gmail.com>

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import re
import json


class Statement(object):
    def __init__(self, type):
        self.type = type

    def __str__(self):
        s = "<{0} ".format(self.__class__.__name__)

        for key, value in self.__dict__.items():
            s += "{0}={1} ".format(key, value)

        s = s.rstrip() + ">"
        return s


class ParamStmt(Statement):
    def __init__(self, param):
        Statement.__init__(self, "PARAM")
        self.param = param


class FSParamStmt(ParamStmt):
    def __init__(self, param, zero="L", notation="A", x="24", y="24"):
        ParamStmt.__init__(self, param)
        self.zero = zero
        self.notation = notation
        self.x = x
        self.y = y


class MOParamStmt(ParamStmt):
    def __init__(self, param, mo):
        ParamStmt.__init__(self, param)
        self.mo = mo


class IPParamStmt(ParamStmt):
    def __init__(self, param, ip):
        ParamStmt.__init__(self, param)
        self.ip = ip


class OFParamStmt(ParamStmt):
    def __init__(self, param, a, b):
        ParamStmt.__init__(self, param)
        self.a = a
        self.b = b


class LPParamStmt(ParamStmt):
    def __init__(self, param, lp):
        ParamStmt.__init__(self, param)
        self.lp = lp


class ADParamStmt(ParamStmt):
    def __init__(self, param, d, shape, modifiers):
        ParamStmt.__init__(self, param)
        self.d = d
        self.shape = shape
        self.modifiers = [[x for x in m.split("X")] for m in modifiers.split(",")]


class AMParamStmt(ParamStmt):
    def __init__(self, param, name, macro):
        ParamStmt.__init__(self, param)
        self.name = name
        self.macro = macro


class INParamStmt(ParamStmt):
    def __init__(self, param, name):
        ParamStmt.__init__(self, param)
        self.name = name


class LNParamStmt(ParamStmt):
    def __init__(self, param, name):
        ParamStmt.__init__(self, param)
        self.name = name


class CoordStmt(Statement):
    def __init__(self, function, x, y, i, j, op):
        Statement.__init__(self, "COORD")
        self.function = function
        self.x = x
        self.y = y
        self.i = i
        self.j = j
        self.op = op


class ApertureStmt(Statement):
    def __init__(self, d):
        Statement.__init__(self, "APERTURE")
        self.d = int(d)


class CommentStmt(Statement):
    def __init__(self, comment):
        Statement.__init__(self, "COMMENT")
        self.comment = comment


class EofStmt(Statement):
    def __init__(self):
        Statement.__init__(self, "EOF")


class UnknownStmt(Statement):
    def __init__(self, line):
        Statement.__init__(self, "UNKNOWN")
        self.line = line


class GerberParser(object):
    NUMBER = r"[\+-]?\d+"
    DECIMAL = r"[\+-]?\d+([.]?\d+)?"
    STRING = r"[a-zA-Z0-9_+\-/!?<>”’(){}.\|&@# :]+"
    NAME = "[a-zA-Z_$][a-zA-Z_$0-9]+"
    FUNCTION = r"G\d{2}"

    COORD_OP = r"D[0]?[123]"

    FS = r"(?P<param>FS)(?P<zero>(L|T))?(?P<notation>(A|I))X(?P<x>[0-7][0-7])Y(?P<y>[0-7][0-7])"
    MO = r"(?P<param>MO)(?P<mo>(MM|IN))"
    IP = r"(?P<param>IP)(?P<ip>(POS|NEG))"
    LP = r"(?P<param>LP)(?P<lp>(D|C))"
    AD_CIRCLE = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>C)[,](?P<modifiers>[^,]*)"
    AD_RECT = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>R)[,](?P<modifiers>[^,]*)"
    AD_OBROUND = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>O)[,](?P<modifiers>[^,]*)"
    AD_POLY = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>P)[,](?P<modifiers>[^,]*)"
    AD_MACRO = r"(?P<param>AD)D(?P<d>\d+)+(?P<shape>{name})[,](?P<modifiers>[^,]*)".format(name=NAME)
    AM = r"(?P<param>AM)(?P<name>{name})\*(?P<macro>.*)".format(name=NAME)

    # begin deprecated
    OF = r"(?P<param>OF)(A(?P<a>{decimal}))?(B(?P<b>{decimal}))?".format(decimal=DECIMAL)
    IN = r"(?P<param>IN)(?P<name>.*)"
    LN = r"(?P<param>LN)(?P<name>.*)"
    # end deprecated

    PARAMS = (FS, MO, IP, LP, AD_CIRCLE, AD_RECT, AD_OBROUND, AD_MACRO, AD_POLY, AM, OF, IN, LN)
    PARAM_STMT = [re.compile(r"%{0}\*%".format(p)) for p in PARAMS]

    COORD_STMT = re.compile((
        r"(?P<function>{function})?"
        r"(X(?P<x>{number}))?(Y(?P<y>{number}))?"
        r"(I(?P<i>{number}))?(J(?P<j>{number}))?"
        r"(?P<op>{op})?\*".format(number=NUMBER, function=FUNCTION, op=COORD_OP)))

    APERTURE_STMT = re.compile(r"(G54)?D(?P<d>\d+)\*")

    COMMENT_STMT = re.compile(r"G04(?P<comment>{string})(\*)?".format(string=STRING))

    EOF_STMT = re.compile(r"(?P<eof>M02)\*")

    def __init__(self, ctx):
        self.statements = []
        self.ctx = ctx

    def parse(self, filename):
        fp = open(filename, "r")
        data = fp.readlines()

        for stmt in self._parse(data):
            self.statements.append(stmt)
            self._evaluate(stmt)

    def dump_json(self):
        stmts = {"statements": [stmt.__dict__ for stmt in self.statements]}
        return json.dumps(stmts)

    def dump_str(self):
        s = ""
        for stmt in self.statements:
            s += str(stmt) + "\n"
        return s

    def dump(self):
        self.ctx.dump()

    def _parse(self, data):
        multiline = None

        for i, line in enumerate(data):
            # remove EOL
            if multiline:
                line = multiline + line.strip()
            else:
                line = line.strip()

            # skip empty lines
            if not len(line):
                continue

            # deal with multi-line parameters
            if line.startswith("%") and not line.endswith("%"):
                multiline = line
                continue
            else:
                multiline = None

            # coord
            coords = self._match_many(self.COORD_STMT, line)
            if coords:
                for coord in coords:
                    yield CoordStmt(**coord)
                continue

            # aperture selection
            aperture = self._match_one(self.APERTURE_STMT, line)
            if aperture:
                yield ApertureStmt(**aperture)
                continue

            # comment
            comment = self._match_one(self.COMMENT_STMT, line)
            if comment:
                yield CommentStmt(comment["comment"])
                continue

            # parameter
            param = self._match_one_from_many(self.PARAM_STMT, line)
            if param:
                if param["param"] == "FS":
                    yield FSParamStmt(**param)
                elif param["param"] == "MO":
                    yield MOParamStmt(**param)
                elif param["param"] == "IP":
                    yield IPParamStmt(**param)
                elif param["param"] == "LP":
                    yield LPParamStmt(**param)
                elif param["param"] == "AD":
                    yield ADParamStmt(**param)
                elif param["param"] == "AM":
                    yield AMParamStmt(**param)
                elif param["param"] == "OF":
                    yield OFParamStmt(**param)
                elif param["param"] == "IN":
                    yield INParamStmt(**param)
                elif param["param"] == "LN":
                    yield LNParamStmt(**param)
                else:
                    yield UnknownStmt(line)

                continue

            # eof
            eof = self._match_one(self.EOF_STMT, line)
            if eof:
                yield EofStmt()
                continue

            if False:
                print self.COORD_STMT.pattern
                print self.APERTURE_STMT.pattern
                print self.COMMENT_STMT.pattern
                print self.EOF_STMT.pattern
                for i in self.PARAM_STMT:
                    print i.pattern

            yield UnknownStmt(line)

    def _match_one(self, expr, data):
        match = expr.match(data)
        if match is None:
            return {}
        else:
            return match.groupdict()

    def _match_one_from_many(self, exprs, data):
        for expr in exprs:
            match = expr.match(data)
            if match:
                return match.groupdict()

        return {}

    def _match_many(self, expr, data):
        result = []
        pos = 0
        while True:
            match = expr.match(data, pos)
            if match:
                result.append(match.groupdict())
                pos = match.endpos
            else:
                break

        return result

    def _evaluate(self, stmt):
        if isinstance(stmt, (CommentStmt, UnknownStmt, EofStmt)):
            return

        elif isinstance(stmt, ParamStmt):
            self._evaluate_param(stmt)

        elif isinstance(stmt, CoordStmt):
            self._evaluate_coord(stmt)

        elif isinstance(stmt, ApertureStmt):
            self._evaluate_aperture(stmt)

        else:
            raise Exception("Invalid statement to evaluate")

    def _evaluate_param(self, stmt):
        if stmt.param == "FS":
            self.ctx.set_coord_format(stmt.zero, stmt.x, stmt.y)
            self.ctx.set_coord_notation(stmt.notation)
        elif stmt.param == "MO:":
            self.ctx.set_coord_unit(stmt.mo)
        elif stmt.param == "IP:":
            self.ctx.set_image_polarity(stmt.ip)
        elif stmt.param == "LP:":
            self.ctx.set_level_polarity(stmt.lp)
        elif stmt.param == "AD":
            self.ctx.define_aperture(stmt.d, stmt.shape, stmt.modifiers)

    def _evaluate_coord(self, stmt):

        if stmt.function in ("G01", "G1", "G02", "G2", "G03", "G3"):
            self.ctx.set_interpolation(stmt.function)

        if stmt.op == "D01":
            self.ctx.stroke(stmt.x, stmt.y)
        elif stmt.op == "D02":
            self.ctx.move(stmt.x, stmt.y)
        elif stmt.op == "D03":
            self.ctx.flash(stmt.x, stmt.y)

    def _evaluate_aperture(self, stmt):
        self.ctx.set_aperture(stmt.d)