#!/usr/bin/env python3

import argparse
import subprocess
import os
import json

def readable_dir(prospective_dir):
  if not os.path.isdir(prospective_dir):
    raise Exception("readable_dir:{0} is not a valid path".format(prospective_dir))
  if os.access(prospective_dir, os.R_OK):
    return prospective_dir
  else:
    raise Exception("readable_dir:{0} is not a readable dir".format(prospective_dir))


parser = argparse.ArgumentParser(description='Generate QtCreator profject files')
parser.add_argument('--prefix', type=str, default='project', help='Project name prefix')
parser.add_argument('builddir', type=readable_dir, default='.', help='Build directory')

args = parser.parse_args()

# get targets
targets_json = json.loads(subprocess.run(['meson', 'introspect', '--targets', args.builddir], stdout=subprocess.PIPE).stdout.decode('utf8'))

#s = json.dumps(targets_json, indent=4)
#print(s)

targets = []
for target in targets_json:
    targets.append(target['id'])

# prefix.files
with open(args.prefix + '.files', 'w') as output:
    for target in targets:
        files_json = json.loads(subprocess.run(['meson', 'introspect', '--target-files', target, args.builddir], stdout=subprocess.PIPE).stdout.decode('utf8'))
        for f in files_json:
            output.write(f + '\n')

# includes
incs = set()
defs = set()

deps_json = json.loads(subprocess.run(['meson', 'introspect', '--dependencies', args.builddir], stdout=subprocess.PIPE).stdout.decode('utf8'))
for dep in deps_json:
    for arg in dep['compile_args']:
        if arg.startswith('-I'):
            incs.add(arg)
        elif arg.startswith('-D'):
            defs.add(arg)

# prefix.includes
with open(args.prefix + '.includes', 'w') as output:
    # dependency includes
    for include in incs:
        output.write(include[2:] + '\n')

    # TODO: properly grab autogenerated include locations
    for target in targets_json:
        output.write(os.path.join(args.builddir, os.path.dirname(target['filename']), target['id']) + '\n')

# prefix.config
with open(args.prefix + '.config', 'w') as output:
    for define in defs:
        output.write('#define ' + define[2:] + '\n')