# Copyright 2021 Efabless Corporation
#
# 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
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# 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.

# Original Copyright Follows
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# BSD 3-Clause License
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# Copyright (c) 2018, The Regents of the University of California
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# modification, are permitted provided that the following conditions are met:
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import pya

import re
import copy
import json

print(
    """
Input: {in_def}
Output: {out_gds}
Design: {design_name}
Technology File: {tech_file}
GDS File List: {in_gds}
LEF File: {lef_file}
""".format(
        in_def=in_def,
        design_name=design_name,
        tech_file=tech_file,
        in_gds=in_gds.split(),
        lef_file=lef_file,
        out_gds=out_gds,
    )
)

try:
    # Expand layers in json
    def expand_cfg_layers(cfg):
        layers = cfg["layers"]
        expand = [layer for layer in layers if "layers" in layers[layer]]
        for layer in expand:
            for i, (name, num) in enumerate(
                zip(layers[layer]["names"], layers[layer]["layers"])
            ):
                new_layer = copy.deepcopy(layers[layer])
                del new_layer["names"]
                new_layer["name"] = name
                del new_layer["layers"]
                new_layer["layer"] = num
                layers[name] = new_layer
            del layers[layer]

    def read_cfg():
        print("INFO: Reading config file: " + config_file)
        with open(config_file, "r") as f:
            cfg = json.load(f)

        expand_cfg_layers(cfg)
        cfg = cfg["layers"]  # ignore the rest

        # Map gds layers & datatype to KLayout indices
        # These are arrays for the different mask numbers
        for layer, vals in cfg.items():
            layer = vals["layer"]
            for key in ("opc", "non-opc"):
                if key not in vals:
                    continue
                data = vals[key]
                if isinstance(data["datatype"], int):
                    data["datatype"] = [data["datatype"]]  # convert to array
                data["klayout"] = [
                    main_layout.find_layer(layer, datatype)
                    for datatype in data["datatype"]
                ]

        return cfg

    # match a line like:
    # - LAYER M2 + MASK 2 + OPC RECT ( 3000 3000 ) ( 5000 5000 ) ;
    rect_pat = re.compile(
        r"""
    \s*\-\ LAYER\ (?P<layer>\S+)  # The layer name
    (?:                           # Non-capturing group
    \s+\+\ MASK\ (?P<mask>\d+)    # Mask, None if absent
    )?
    (?P<opc>                      # OPC, None if absent
    \s+\+\ OPC
    )?
    \s+RECT\ 
    \(\ (?P<xlo>\d+)\ (?P<ylo>\d+)\ \)\   # rect lower-left pt
    \(\ (?P<xhi>\d+)\ (?P<yhi>\d+)\ \)\ ; # rect upper-right pt
    """,
        re.VERBOSE,
    )

    def read_fills(top):
        if config_file == "":
            print("WARNING: no fill config file specified")
            return
        # KLayout doesn't support FILL in DEF so we have to side load them :(
        cfg = read_cfg()
        in_fills = False
        units = None
        with open(in_def) as fp:
            for line in fp:
                if in_fills:
                    if re.match("END FILLS", line):
                        break  # done with fills; don't care what follows
                    m = re.match(rect_pat, line)
                    if not m:
                        raise Exception("Unrecognized fill: " + line)
                    opc_type = "opc" if m.group("opc") else "non-opc"
                    mask = m.group("mask")
                    if not mask:  # uncolored just uses first entry
                        mask = 0
                    else:
                        mask = int(mask) - 1  # DEF is 1-based indexing
                    layer = cfg[m.group("layer")][opc_type]["klayout"][mask]
                    xlo = int(m.group("xlo")) / units
                    ylo = int(m.group("ylo")) / units
                    xhi = int(m.group("xhi")) / units
                    yhi = int(m.group("yhi")) / units
                    top.shapes(layer).insert(pya.DBox(xlo, ylo, xhi, yhi))
                elif re.match("FILLS \d+ ;", line):
                    in_fills = True
                elif not units:
                    m = re.match("UNITS DISTANCE MICRONS (\d+)", line)
                    if m:
                        units = float(m.group(1))

    # Load technology file
    tech = pya.Technology()
    tech.load(tech_file)
    layoutOptions = tech.load_layout_options
    layoutOptions.lefdef_config.macro_resolution_mode = 1
    layoutOptions.lefdef_config.lef_files = [lef_file]

    # Load def file
    main_layout = pya.Layout()
    main_layout.read(in_def, layoutOptions)

    # Clear cells
    top_cell_index = main_layout.cell(design_name).cell_index()

    print("[INFO] Clearing cells...")
    for i in main_layout.each_cell():
        if i.cell_index() != top_cell_index:
            if not i.name.startswith("VIA"):
                # print("\t" + i.name)
                i.clear()

    # Load in the gds to merge
    print("[INFO] Merging GDS files...")
    for gds in in_gds.split():
        print("\t{0}".format(gds))
        main_layout.read(gds)

    # Copy the top level only to a new layout
    print("[INFO] Copying toplevel cell '{0}'".format(design_name))
    top_only_layout = pya.Layout()
    top_only_layout.dbu = main_layout.dbu
    top = top_only_layout.create_cell(design_name)
    top.copy_tree(main_layout.cell(design_name))

    read_fills(top)

    print("[INFO] Checking for missing GDS...")
    missing_gds = False
    for i in top_only_layout.each_cell():
        if i.is_empty():
            missing_gds = True
            print(
                "[ERROR] LEF Cell '{0}' has no matching GDS cell. Cell will be empty".format(
                    i.name
                )
            )

    if not missing_gds:
        print("[INFO] All LEF cells have matching GDS cells")

    if seal_gds:
        top_cell = top_only_layout.top_cell()

        print("[INFO] Reading seal GDS file...")
        print("\t{0}".format(seal_gds))
        top_only_layout.read(seal_gds)

        for cell in top_only_layout.top_cells():
            if cell != top_cell:
                print(
                    "[INFO] Merging '{0}' as child of '{1}'".format(
                        cell.name, top_cell.name
                    )
                )
                top.insert(pya.CellInstArray(cell.cell_index(), pya.Trans()))

    # Write out the GDS
    print("[INFO] Writing out GDS '{0}'".format(out_gds))
    top_only_layout.write(out_gds)
    print("[INFO] Done.")
    pya.Application.instance().exit(0)
except Exception as e:
    print(e)
    pya.Application.instance().exit(1)