#!/usr/bin/env python3
import os
import sys
import argparse
import glob
import shutil

from typing import List

ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

sys.path.append(ZULIP_PATH)
from scripts.lib.zulip_tools import run, OKBLUE, ENDC, \
    get_dev_uuid_var_path, is_digest_obsolete, write_new_digest

from version import PROVISION_VERSION
from pygments import __version__ as pygments_version

from tools.setup.generate_zulip_bots_static_files import generate_zulip_bots_static_files

VENV_PATH = "/srv/zulip-py3-venv"
UUID_VAR_PATH = get_dev_uuid_var_path()

def create_var_directories() -> None:
    # create var/coverage, var/log, etc.
    var_dir = os.path.join(ZULIP_PATH, 'var')
    sub_dirs = [
        'coverage',
        'log',
        'node-coverage',
        'test_uploads',
        'uploads',
        'xunit-test-results',
    ]
    for sub_dir in sub_dirs:
        path = os.path.join(var_dir, sub_dir)
        os.makedirs(path, exist_ok=True)

def build_pygments_data_paths() -> List[str]:
    paths = [
        "tools/setup/build_pygments_data",
        "tools/setup/lang.json",
    ]
    return paths

def compilemessages_paths() -> List[str]:
    paths = ['zerver/management/commands/compilemessages.py']
    paths += glob.glob('locale/*/LC_MESSAGES/*.po')
    paths += glob.glob('locale/*/translations.json')
    return paths

def inline_email_css_paths() -> List[str]:
    paths = [
        "scripts/setup/inline_email_css.py",
        "templates/zerver/emails/email.css",
    ]
    paths += glob.glob('templates/zerver/emails/*.source.html')
    return paths

def configure_rabbitmq_paths() -> List[str]:
    paths = [
        "scripts/setup/configure-rabbitmq",
        "zproject/dev-secrets.conf",
    ]
    return paths

def setup_shell_profile(shell_profile: str) -> None:
    shell_profile_path = os.path.expanduser(shell_profile)

    def write_command(command: str) -> None:
        if os.path.exists(shell_profile_path):
            with open(shell_profile_path) as shell_profile_file:
                lines = [line.strip() for line in shell_profile_file.readlines()]
            if command not in lines:
                with open(shell_profile_path, 'a+') as shell_profile_file:
                    shell_profile_file.writelines(command + '\n')
        else:
            with open(shell_profile_path, 'w') as shell_profile_file:
                shell_profile_file.writelines(command + '\n')

    source_activate_command = "source " + os.path.join(VENV_PATH, "bin", "activate")
    write_command(source_activate_command)
    if os.path.exists('/srv/zulip'):
        write_command('cd /srv/zulip')

def setup_bash_profile() -> None:
    """Select a bash profile file to add setup code to."""

    BASH_PROFILES = [
        os.path.expanduser(p) for p in
        ("~/.bash_profile", "~/.bash_login", "~/.profile")
    ]

    def clear_old_profile() -> None:
        # An earlier version of this script would output a fresh .bash_profile
        # even though a .profile existed in the image used. As a convenience to
        # existing developers (and, perhaps, future developers git-bisecting the
        # provisioning scripts), check for this situation, and blow away the
        # created .bash_profile if one is found.

        BASH_PROFILE = BASH_PROFILES[0]
        DOT_PROFILE = BASH_PROFILES[2]
        OLD_PROFILE_TEXT = "source /srv/zulip-py3-venv/bin/activate\n" + \
            "cd /srv/zulip\n"

        if os.path.exists(DOT_PROFILE):
            try:
                with open(BASH_PROFILE) as f:
                    profile_contents = f.read()
                if profile_contents == OLD_PROFILE_TEXT:
                    os.unlink(BASH_PROFILE)
            except FileNotFoundError:
                pass

    clear_old_profile()

    for candidate_profile in BASH_PROFILES:
        if os.path.exists(candidate_profile):
            setup_shell_profile(candidate_profile)
            break
    else:
        # no existing bash profile found; claim .bash_profile
        setup_shell_profile(BASH_PROFILES[0])

def need_to_run_build_pygments_data() -> bool:
    if not os.path.exists("static/generated/pygments_data.json"):
        return True

    return is_digest_obsolete(
        "build_pygments_data_hash",
        build_pygments_data_paths(),
        [pygments_version]
    )

def need_to_run_compilemessages() -> bool:
    if not os.path.exists('locale/language_name_map.json'):
        # User may have cleaned their git checkout.
        print('Need to run compilemessages due to missing language_name_map.json')
        return True

    return is_digest_obsolete(
        "last_compilemessages_hash",
        compilemessages_paths(),
    )

def need_to_run_inline_email_css() -> bool:
    if not os.path.exists('templates/zerver/emails/compiled/'):
        return True

    return is_digest_obsolete(
        "last_email_source_files_hash",
        inline_email_css_paths(),
    )

def need_to_run_configure_rabbitmq() -> bool:
    obsolete = is_digest_obsolete(
        'last_configure_rabbitmq_hash',
        configure_rabbitmq_paths(),
    )

    if obsolete:
        return True

    try:
        from zerver.lib.queue import SimpleQueueClient
        SimpleQueueClient()
        return False
    except Exception:
        return True

def main(options: argparse.Namespace) -> int:
    setup_bash_profile()
    setup_shell_profile('~/.zprofile')

    # This needs to happen before anything that imports zproject.settings.
    run(["scripts/setup/generate_secrets.py", "--development"])

    create_var_directories()

    # The `build_emoji` script requires `emoji-datasource` package
    # which we install via npm; thus this step is after installing npm
    # packages.
    run(["tools/setup/emoji/build_emoji"])

    # copy over static files from the zulip_bots package
    generate_zulip_bots_static_files()

    if options.is_force or need_to_run_build_pygments_data():
        run(["tools/setup/build_pygments_data"])
        write_new_digest(
            'build_pygments_data_hash',
            build_pygments_data_paths(),
            [pygments_version]
        )
    else:
        print("No need to run `tools/setup/build_pygments_data`.")

    if options.is_force or need_to_run_inline_email_css():
        run(["scripts/setup/inline_email_css.py"])
        write_new_digest(
            "last_email_source_files_hash",
            inline_email_css_paths(),
        )
    else:
        print("No need to run `scripts/setup/inline_email_css.py`.")

    if not options.is_production_test_suite:
        # The following block is skipped for the production test
        # suite, because that suite doesn't make use of these elements
        # of the development environment (it just uses the development
        # environment to build a release tarball).

        # Need to set up Django before using template_status
        os.environ.setdefault("DJANGO_SETTINGS_MODULE", "zproject.settings")
        import django
        django.setup()

        from zerver.lib.test_fixtures import (
            DEV_DATABASE,
            TEST_DATABASE,
            destroy_leaked_test_databases,
        )

        if options.is_force or need_to_run_configure_rabbitmq():
            run(["scripts/setup/configure-rabbitmq"])
            write_new_digest(
                'last_configure_rabbitmq_hash',
                configure_rabbitmq_paths(),
            )
        else:
            print("No need to run `scripts/setup/configure-rabbitmq.")

        dev_template_db_status = DEV_DATABASE.template_status()
        if options.is_force or dev_template_db_status == 'needs_rebuild':
            run(["tools/setup/postgres-init-dev-db"])
            run(["tools/rebuild-dev-database"])
        elif dev_template_db_status == 'run_migrations':
            DEV_DATABASE.run_db_migrations()
        elif dev_template_db_status == 'current':
            print("No need to regenerate the dev DB.")

        test_template_db_status = TEST_DATABASE.template_status()
        if options.is_force or test_template_db_status == 'needs_rebuild':
            run(["tools/setup/postgres-init-test-db"])
            run(["tools/rebuild-test-database"])
        elif test_template_db_status == 'run_migrations':
            TEST_DATABASE.run_db_migrations()
        elif test_template_db_status == 'current':
            print("No need to regenerate the test DB.")

        if options.is_force or need_to_run_compilemessages():
            run(["./manage.py", "compilemessages"])
            write_new_digest(
                "last_compilemessages_hash",
                compilemessages_paths(),
            )
        else:
            print("No need to run `manage.py compilemessages`.")

        destroyed = destroy_leaked_test_databases()
        if destroyed:
            print("Dropped %s stale test databases!" % (destroyed,))

    run(["scripts/lib/clean-unused-caches", "--threshold=6"])

    # Keeping this cache file around can cause eslint to throw
    # random TypeErrors when new/updated dependencies are added
    if os.path.isfile('.eslintcache'):
        # Remove this block when
        # https://github.com/eslint/eslint/issues/11639 is fixed
        # upstream.
        os.remove('.eslintcache')

    # Clean up the root of the `var/` directory for various
    # testing-related files that we have migrated to
    # `var/<uuid>/test-backend`.
    print("Cleaning var/ directory files...")
    var_paths = glob.glob('var/test*')
    var_paths.append('var/bot_avatar')
    for path in var_paths:
        try:
            if os.path.isdir(path):
                shutil.rmtree(path)
            else:
                os.remove(path)
        except FileNotFoundError:
            pass

    version_file = os.path.join(UUID_VAR_PATH, 'provision_version')
    print('writing to %s\n' % (version_file,))
    open(version_file, 'w').write(PROVISION_VERSION + '\n')

    print()
    print(OKBLUE + "Zulip development environment setup succeeded!" + ENDC)
    return 0

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('--force', action='store_true', dest='is_force',
                        default=False,
                        help="Ignore all provisioning optimizations.")

    parser.add_argument('--production-test-suite', action='store_true',
                        dest='is_production_test_suite',
                        default=False,
                        help="Provision for test suite with production settings.")

    options = parser.parse_args()
    sys.exit(main(options))