################################################################################################
# Copyright 2022 GlobalFoundries PDK Authors
#
# 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
#
#     https://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.
################################################################################################


if BEOL

    if METAL_LEVEL == '5LM' || METAL_LEVEL == '6LM'    
        #================================================
        #----------------------VIA4----------------------
        #================================================ 

        # Rule V4.1: Min/max Via4 size . is 0.26µm
        logger.info('Executing rule V4.1')
        v41_l1 = via4.edges.without_length(0.26.um).extended(0, 0, 0.001, 0.001)
        v41_l1.output('V4.1', 'V4.1 : Min/max Via4 size . : 0.26µm')
        v41_l1.forget

        # Rule V4.2: min. via4 spacing is 0.26µm
        logger.info('Executing rule V4.2')
        v42_l1  = via4.space(0.26.um, euclidian).polygons(0.001)
        v42_l1.output('V4.2', 'V4.2 : min. via4 spacing : 0.26µm')
        v42_l1.forget 

        # Rule V4.3a: metal4  overlap of via4.
        logger.info('Executing rule V4.3a')
        v43b_l1 = metal4.enclosing(via4, 0.01.um, euclidian).polygons(0.001).or(via4.not(metal4))
        v43b_l1.output('V4.3a', 'V4.3a : metal4  overlap of via4.')
        v43b_l1.forget

        v4p3b_cond = metal4.drc( width <= 0.34.um).with_length(0.28.um,nil,both)
        v4p3b_eol = metal4.edges.with_length(nil, 0.34.um).interacting(v4p3b_cond.first_edges).interacting(v4p3b_cond.second_edges).not(v4p3b_cond.first_edges).not(v4p3b_cond.second_edges)
        # Rule V4.3b: metal4 (< 0.34um) end-of-line overlap. is 0.06µm
        logger.info('Executing rule V4.3b')
        v43b_l1 = v4p3b_eol.enclosing(via4.edges,0.06.um, projection).polygons(0.001)
        v43b_l1.output('V4.3b', 'V4.3b : metal4 (< 0.34um) end-of-line overlap. : 0.06µm')
        v43b_l1.forget

        v4p3b_cond.forget

        v4p3b_eol.forget

        v4_3c_1 = via4.edges.interacting(via4.drc(enclosed(metal4, projection) < 0.04.um).edges.centers(0, 0.5))
        v4_3c_2 = via4.edges.interacting(via4.drc(0.04.um <= enclosed(metal4, projection) < 0.06.um).centers(0, 0.5))
        v4_3c_3 = v4_3c_1.extended(0, 0, 0, 0.001, joined).corners(90)
        # Rule V4.3c: If metal4 overlap Vian by < 0.04um on one side, adjacent metal4 edges overlap. is 0.06µm
        logger.info('Executing rule V4.3c')
        v43c_l1 = v4_3c_2.not_in(v4_3c_1).interacting(v4_3c_1).or(v4_3c_1.interacting(v4_3c_3)).enclosed(metal4.edges, 0.06.um).polygons(0.001)
        v43c_l1.output('V4.3c', 'V4.3c : If metal4 overlap Vian by < 0.04um on one side, adjacent metal4 edges overlap. : 0.06µm')
        v43c_l1.forget

        v4_3c_1.forget

        v4_3c_2.forget

        v4_3c_3.forget

        # rule V4.3d is not a DRC check

        # Rule V4.4a: metal5 overlap of via4. is 0.01um
        logger.info('Executing rule V4.4a')
        v4_4a_l1 = metal5.enclosing(via4, 0.01.um, euclidian).polygons(0.001)
        v4_4a_l2 = via4.interacting(metal5).not(metal5)
        v4_4a_l = v4_4a_l1.join(v4_4a_l2)         
        v4_4a_l.output('V4.4a', 'V4.4a : metal5 overlap of via4.: 0.01um')
        v4_4a_l1.forget
        v4_4a_l2.forget
        v4_4a_l.forget

        v4p4b_cond = metal5.drc( width <= 0.34.um).with_length(0.28.um,nil,both)
        v4p4b_eol = metal5.edges.with_length(nil, 0.34.um).interacting(v4p4b_cond.first_edges).interacting(v4p4b_cond.second_edges).not(v4p4b_cond.first_edges).not(v4p4b_cond.second_edges)
        # Rule V4.4b: metal5 (< 0.34um) end-of-line overlap. is 0.06µm
        logger.info('Executing rule V4.4b')
        v44b_l1 = v4p4b_eol.enclosing(via4.edges,0.06.um, projection).polygons(0.001)
        v44b_l1.output('V4.4b', 'V4.4b : metal5 (< 0.34um) end-of-line overlap. : 0.06µm')
        v44b_l1.forget

        v4p4b_cond.forget

        v4p4b_eol.forget

        v4_4c_1 = via4.edges.interacting(via4.drc(enclosed(metal5, projection) < 0.04.um).edges.centers(0, 0.5))
        v4_4c_2 = via4.edges.interacting(via4.drc(0.04.um <= enclosed(metal5, projection) < 0.06.um).centers(0, 0.5))
        v4_4c_3 = v4_4c_1.extended(0, 0, 0, 0.001, joined).corners(90)
        # Rule V4.4c: If metal5 overlap via4 by < 0.04um on one side, adjacent metal5 edges overlap. is 0.06µm
        logger.info('Executing rule V4.4c')
        v44c_l1 = v4_4c_2.not_in(v4_4c_1).interacting(v4_4c_1).or(v4_4c_1.interacting(v4_4c_3)).enclosed(metal5.edges, 0.06.um).polygons(0.001)
        v44c_l1.output('V4.4c', 'V4.4c : If metal5 overlap via4 by < 0.04um on one side, adjacent metal5 edges overlap. : 0.06µm')
        v44c_l1.forget

        v4_4c_1.forget

        v4_4c_2.forget

        v4_4c_3.forget

        # rule V4.4d is not a DRC check

        # rule V4.5 is not a DRC check
    end # METAL_LEVEL
end #BEOL