#!/usr/bin/env python3
#
# This file is part of the MicroPython project, http://micropython.org/
#
# The MIT License (MIT)
#
# Copyright (c) 2020 Damien P. George
# Copyright (c) 2020 Jim Mussared
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import argparse
import glob
import itertools
import os
import re
import subprocess

# Relative to top-level repo dir.
PATHS = [
 "drivers/ninaw10/*.[ch]",
 "extmod/*.[ch]",
 "extmod/btstack/*.[ch]",
 "extmod/nimble/*.[ch]",
 "lib/mbedtls_errors/tester.c",
 "shared/netutils/*.[ch]",
 "shared/timeutils/*.[ch]",
 "shared/runtime/*.[ch]",
 "shared/tinyusb/*.[ch]",
 "mpy-cross/*.[ch]",
 "ports/**/*.[ch]",
 "py/*.[ch]",
]

EXCLUSIONS = [
 # The cc3200 port is not fully formatted yet.
 "ports/cc3200/*/*.[ch]",
 # ESP-IDF downloads 3rd party code.
 "ports/esp32/managed_components/*",
 # The nrf port is not fully formatted yet.
 "ports/nrf/boards/*.[ch]",
 "ports/nrf/device/*.[ch]",
 "ports/nrf/drivers/*.[ch]",
 "ports/nrf/modules/ble/*.[ch]",
 "ports/nrf/modules/board/*.[ch]",
 "ports/nrf/modules/music/*.[ch]",
 "ports/nrf/modules/ubluepy/*.[ch]",
 "ports/nrf/modules/os/*.[ch]",
 # STM32 USB dev/host code is mostly 3rd party.
 "ports/stm32/usbdev/**/*.[ch]",
 "ports/stm32/usbhost/**/*.[ch]",
 # STM32 build includes generated Python code.
 "ports/*/build*",
]

# Path to repo top-level dir.
TOP = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))

UNCRUSTIFY_CFG = os.path.join(TOP, "tools/uncrustify.cfg")


def list_files(paths, exclusions=None, prefix=""):
 files = set()
 for pattern in paths:
 files.update(glob.glob(os.path.join(prefix, pattern), recursive=True))
 for pattern in exclusions or []:
 files.difference_update(glob.fnmatch.filter(files, os.path.join(prefix, pattern)))
 return sorted(files)


def fixup_c(filename):
 # Read file.
 with open(filename) as f:
 lines = f.readlines()

 # Write out file with fixups.
 with open(filename, "w", newline="") as f:
 dedent_stack = []
 while lines:
 # Get next line.
 l = lines.pop(0)

 # Dedent #'s to match indent of following line (not previous line).
 m = re.match(r"( +)#(if |ifdef |ifndef |elif |else|endif)", l)
 if m:
 indent = len(m.group(1))
 directive = m.group(2)
 if directive in ("if ", "ifdef ", "ifndef "):
 l_next = lines[0]
 indent_next = len(re.match(r"( *)", l_next).group(1))
 if indent - 4 == indent_next and re.match(r" +(} else |case )", l_next):
 # This #-line (and all associated ones) needs dedenting by 4 spaces.
 l = l[4:]
 dedent_stack.append(indent - 4)
 else:
 # This #-line does not need dedenting.
 dedent_stack.append(-1)
 else:
 if dedent_stack[-1] >= 0:
 # This associated #-line needs dedenting to match the #if.
 indent_diff = indent - dedent_stack[-1]
 assert indent_diff >= 0
 l = l[indent_diff:]
 if directive == "endif":
 dedent_stack.pop()

 # Write out line.
 f.write(l)

 assert not dedent_stack, filename


def main():
 cmd_parser = argparse.ArgumentParser(description="Auto-format C and Python files.")
 cmd_parser.add_argument("-c", action="store_true", help="Format C code only")
 cmd_parser.add_argument("-p", action="store_true", help="Format Python code only")
 cmd_parser.add_argument("-v", action="store_true", help="Enable verbose output")
 cmd_parser.add_argument(
 "-f",
 action="store_true",
 help="Filter files provided on the command line against the default list of files to check.",
 )
 cmd_parser.add_argument("files", nargs="*", help="Run on specific globs")
 args = cmd_parser.parse_args()

 # Setting only one of -c or -p disables the other. If both or neither are set, then do both.
 format_c = args.c or not args.p
 format_py = args.p or not args.c

 # Expand the globs passed on the command line, or use the default globs above.
 files = []
 if args.files:
 files = list_files(args.files)
 if args.f:
 # Filter against the default list of files. This is a little fiddly
 # because we need to apply both the inclusion globs given in PATHS
 # as well as the EXCLUSIONS, and use absolute paths
 files = set(os.path.abspath(f) for f in files)
 all_files = set(list_files(PATHS, EXCLUSIONS, TOP))
 if args.v: # In verbose mode, log any files we're skipping
 for f in files - all_files:
 print("Not checking: {}".format(f))
 files = list(files & all_files)
 else:
 files = list_files(PATHS, EXCLUSIONS, TOP)

 # Run tool on N files at a time (to avoid making the command line too long).
 def batch(cmd, N=200):
 files_iter = iter(files)
 while True:
 file_args = list(itertools.islice(files_iter, N))
 if not file_args:
 break
 subprocess.check_call(cmd + file_args)

 # Format C files with uncrustify.
 if format_c:
 command = ["uncrustify", "-c", UNCRUSTIFY_CFG, "-lC", "--no-backup"]
 if not args.v:
 command.append("-q")
 batch(command)
 for file in files:
 fixup_c(file)

 # Format Python files with "ruff format" (using config in pyproject.toml).
 if format_py:
 command = ["ruff", "format"]
 if args.v:
 command.append("-v")
 else:
 command.append("-q")
 command.append(".")
 subprocess.check_call(command, cwd=TOP)


if __name__ == "__main__":
 main()