#!/usr/bin/env python3
#
#    Copyright (c) 2020 Project CHIP 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
#
#        http://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.
#

import argparse
import os
from pathlib import Path
import sys
import subprocess
import logging
from dataclasses import dataclass

CHIP_ROOT_DIR = os.path.realpath(
    os.path.join(os.path.dirname(__file__), '../..'))


@dataclass(eq=True, frozen=True)
class ZapDistinctOutput:
    """Defines the properties that determine if some output seems unique or 
       not, for the purposes of detecting codegen overlap.

       Not perfect, since separate templates may use the same file names, but
       better than nothing.
    """

    input_template: str
    output_directory: str


class ZAPGenerateTarget:
    def __init__(self, zap_config, template=None, output_dir=None):
        self.script = './scripts/tools/zap/generate.py'
        self.zap_config = str(zap_config)
        self.template = template

        if output_dir:
            # make sure we convert  any os.PathLike object to string
            self.output_dir = str(output_dir)
        else:
            self.output_dir = None

    def distinct_output(self):
        return ZapDistinctOutput(input_template=self.template, output_directory=self.output_dir)

    def log_command(self):
        """Log the command that will get run for this target
        """
        logging.info("  %s" % " ".join(self.build_cmd()))

    def build_cmd(self):
        """Builds the command line we would run to generate this target.
        """
        cmd = [self.script, self.zap_config]

        if self.template:
            cmd.append('-t')
            cmd.append(self.template)

        if self.output_dir:
            if not os.path.exists(self.output_dir):
                os.makedirs(self.output_dir)
            cmd.append('-o')
            cmd.append(self.output_dir)

        return cmd

    def generate(self):
        """Runs a ZAP generate command on the configured zap/template/outputs.
        """
        cmd = self.build_cmd()
        logging.info("Generating target: %s" % " ".join(cmd))
        subprocess.check_call(cmd)
        if "chef" in self.zap_config:
            af_gen_event = os.path.join(self.output_dir, "af-gen-event.h")
            with open(af_gen_event, "w+"):  # Empty file needed for linux
                pass
            idl_path = self.zap_config.replace(".zap", ".matter")
            target_path = os.path.join("examples",
                                       "chef",
                                       "devices",
                                       os.path.basename(idl_path))
            os.rename(idl_path, target_path)


def checkPythonVersion():
    if sys.version_info[0] < 3:
        print('Must use Python 3. Current version is ' +
              str(sys.version_info[0]))
        exit(1)


def setupArgumentsParser():
    parser = argparse.ArgumentParser(
        description='Generate content from ZAP files')
    parser.add_argument('--type', default='all', choices=['all', 'tests'],
                        help='Choose which content type to generate (default: all)')
    parser.add_argument('--tests', default='all', choices=['all', 'chip-tool', 'darwin-framework-tool', 'app1', 'app2'],
                        help='When generating tests only target, Choose which tests to generate (default: all)')
    parser.add_argument('--dry-run', default=False, action='store_true',
                        help="Don't do any generation, just log what targets would be generated (default: False)")
    parser.add_argument('--run-bootstrap', default=None, action='store_true',
                        help='Automatically run ZAP bootstrap. By default the bootstrap is not triggered')
    return parser.parse_args()


def getGlobalTemplatesTargets():
    targets = []

    for filepath in Path('./examples').rglob('*.zap'):
        example_name = filepath.as_posix()
        example_name = example_name[example_name.index('examples/') + 9:]
        example_name = example_name[:example_name.index('/')]

        # Place holder has apps within each build
        if example_name == "placeholder":
            example_name = filepath.as_posix()
            example_name = example_name[example_name.index(
                'apps/') + len('apps/'):]
            example_name = example_name[:example_name.index('/')]
            logging.info("Found example %s (via %s)" %
                         (example_name, str(filepath)))

            # The name zap-generated is to make includes clear by using
            # a name like <zap-generated/foo.h>
            output_dir = os.path.join(
                'zzz_generated', 'placeholder', example_name, 'zap-generated')
            template = 'examples/placeholder/templates/templates.json'

            targets.append(ZAPGenerateTarget(filepath, output_dir=output_dir))
            targets.append(
                ZAPGenerateTarget(filepath, output_dir=output_dir, template=template))
            continue

        if example_name == "chef":
            if os.path.join("chef", "devices") not in str(filepath):
                continue
            example_name = "chef-"+os.path.basename(filepath)[:-len(".zap")]

        logging.info("Found example %s (via %s)" %
                     (example_name, str(filepath)))

        generate_subdir = example_name

        # Special casing lighting app because separate folders
        if example_name == "lighting-app":
            if 'nxp' in str(filepath):
                generate_subdir = f"{example_name}/nxp"

        # The name zap-generated is to make includes clear by using
        # a name like <zap-generated/foo.h>
        output_dir = os.path.join(
            'zzz_generated', generate_subdir, 'zap-generated')
        targets.append(ZAPGenerateTarget(filepath, output_dir=output_dir))

    targets.append(ZAPGenerateTarget(
        'src/controller/data_model/controller-clusters.zap',
        output_dir=os.path.join('zzz_generated/controller-clusters/zap-generated')))

    return targets


def getTestsTemplatesTargets(test_target):
    templates = {
        'chip-tool': {
            'zap': 'src/controller/data_model/controller-clusters.zap',
            'template': 'examples/chip-tool/templates/tests/templates.json',
            'output_dir': 'zzz_generated/chip-tool/zap-generated'
        },
        'darwin-framework-tool': {
            'zap': 'src/controller/data_model/controller-clusters.zap',
            'template': 'examples/darwin-framework-tool/templates/tests/templates.json',
            'output_dir': 'zzz_generated/darwin-framework-tool/zap-generated'
        }
    }

    targets = []
    for key, target in templates.items():
        if test_target == 'all' or test_target == key:
            logging.info("Found test target %s (via %s)" %
                         (key, target['template']))
            targets.append(ZAPGenerateTarget(
                target['zap'], template=target['template'], output_dir=target['output_dir']))

    return targets


def getSpecificTemplatesTargets():
    zap_filepath = 'src/controller/data_model/controller-clusters.zap'

    # Mapping of required template and output directory
    templates = {
        'src/app/common/templates/templates.json': 'zzz_generated/app-common/app-common/zap-generated',
        'src/app/tests/suites/templates/templates.json': 'zzz_generated/app-common/app-common/zap-generated',
        'examples/chip-tool/templates/templates.json': 'zzz_generated/chip-tool/zap-generated',
        'examples/darwin-framework-tool/templates/templates.json': 'zzz_generated/darwin-framework-tool/zap-generated',
        'src/controller/python/templates/templates.json': None,
        'src/darwin/Framework/CHIP/templates/templates.json': None,
        'src/controller/java/templates/templates.json': None,
    }

    targets = []
    for template, output_dir in templates.items():
        logging.info("Found specific template %s" % template)
        targets.append(ZAPGenerateTarget(
            zap_filepath, template=template, output_dir=output_dir))

    return targets


def getTargets(type, test_target):
    targets = []

    if type == 'all':
        targets.extend(getGlobalTemplatesTargets())
        targets.extend(getTestsTemplatesTargets('all'))
        targets.extend(getSpecificTemplatesTargets())
    elif type == 'tests':
        targets.extend(getTestsTemplatesTargets(test_target))

    logging.info("Targets to be generated:")
    for target in targets:
        target.log_command()

    # validate that every target as a DISTINCT directory (we had bugs here
    # for various examples duplicating zap files)
    distinct_outputs = set()
    for target in targets:
        o = target.distinct_output()

        if o in distinct_outputs:
            logging.error("Same output %r:" % o)
            for t in targets:
                if t.distinct_output() == o:
                    logging.error("   %s" % t.zap_config)

            raise Exception("Duplicate/overlapping output directory: %r" % o)

        distinct_outputs.add(o)

    return targets


def main():
    logging.basicConfig(
        level=logging.INFO,
        format='%(asctime)s %(name)s %(levelname)-7s %(message)s'
    )
    checkPythonVersion()
    os.chdir(CHIP_ROOT_DIR)
    args = setupArgumentsParser()

    targets = getTargets(args.type, args.tests)

    if not args.dry_run:

        if args.run_bootstrap:
            subprocess.check_call(os.path.join(CHIP_ROOT_DIR, "scripts/tools/zap/zap_bootstrap.sh"), shell=True)

        for target in targets:
            target.generate()


if __name__ == '__main__':
    main()