#!/usr/bin/env python3
import os

import hammer_vlsi
from hammer_vlsi import CLIDriver, HammerToolHookAction

from typing import Dict, Callable, Optional, List

def example_place_tap_cells(x: hammer_vlsi.HammerTool) -> bool:
    x.append('''
# TODO
# Place custom TCL here
''')
    return True

def example_add_fillers(x: hammer_vlsi.HammerTool) -> bool:
    x.append('''
# TODO
# Place custom TCL here
''')
    return True

def example_tool_settings(x: hammer_vlsi.HammerTool) -> bool:
    x.append('''
# TODO
# Place custom TCL here
set_db route_design_bottom_routing_layer 2
set_db route_design_top_routing_layer 7
''')
    return True

def scale_final_gds(x: hammer_vlsi.HammerTool) -> bool:
    """
    Scale the final GDS by a factor of 4
    hammer/src/hammer-vlsi/technology/asap7/__init__.py implements scale_gds_script
    """
    x.append('''
# Write script out to a temporary file and execute it
set fp [open "{script_file}" "w"]
puts -nonewline $fp "{script_text}"
close $fp

# Innovus <19.1 appends some bad LD_LIBRARY_PATHS, so remove them before executing python
set env(LD_LIBRARY_PATH) [join [lsearch -not -all -inline [split $env(LD_LIBRARY_PATH) ":"] "*INNOVUS*"] ":"]
python3 {script_file}
'''.format(script_text=x.technology.scale_gds_script(x.output_gds_filename), script_file=os.path.join(x.run_dir, "gds_scale.py")))
    return True


class ExampleDriver(CLIDriver):
    def get_extra_par_hooks(self) -> List[HammerToolHookAction]:
        extra_hooks = [

            # Default set of steps can be found in the CAD tool plugin's __init__.py

            # make_pre_insertion_hook will execute the custom hook before the specified step
            # SYNTAX: make_pre_insertion_hook("EXISTING_STEP", INSERTED_HOOK)
            # hammer_vlsi.HammerTool.make_pre_insertion_hook("route_design", example_add_fillers),

            # make_post_insertion_hook will execute the custom hook after the specified step
            hammer_vlsi.HammerTool.make_post_insertion_hook("init_design", example_tool_settings),

            # make_replacement_hook will replace the specified step with a custom hook
            # hammer_vlsi.HammerTool.make_replacement_hook("place_tap_cells", example_place_tap_cells),

            # make_removal_hook will remove the specified step from the flow
            hammer_vlsi.HammerTool.make_removal_hook("place_bumps"),

            # The target step in any of the above calls may be a default step or another one of your custom hooks

            # This is an example of a technology-supplied hook
            hammer_vlsi.HammerTool.make_post_insertion_hook("write_design", scale_final_gds)
        ]
        return extra_hooks 

if __name__ == '__main__':
    ExampleDriver().main()