#!/usr/bin/env python3
from __future__ import annotations

# Allow direct execution
import os
import sys

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

import collections.abc
import dataclasses
import hashlib
import io
import pathlib
import re
import zipfile

from devscripts.tomlparse import parse_toml
from devscripts.utils import (
    call_github_api,
    request,
    run_process,
    zipf_files_and_folders,
)


BASE_PATH = pathlib.Path(__file__).parent.parent
PYPROJECT_PATH = BASE_PATH / 'pyproject.toml'
MAKEFILE_PATH = BASE_PATH / 'Makefile'
LOCKFILE_PATH = BASE_PATH / 'uv.lock'
REQUIREMENTS_PATH = BASE_PATH / 'bundle/requirements'
REQS_OUTPUT_TMPL = 'requirements-{}.txt'
CUSTOM_COMPILE_COMMAND = 'python -m devscripts.update_requirements'

EXTRAS_TABLE = 'project.optional-dependencies'
GROUPS_TABLE = 'dependency-groups'

PINNED_EXTRAS = {
    'pin': 'default',
    'pin-curl-cffi': 'curl-cffi',
    'pin-secretstorage': 'secretstorage',
    'pin-deno': 'deno',
}

EJS_ASSETS = {
    'yt.solver.lib.js': False,
    'yt.solver.lib.min.js': False,
    'yt.solver.deno.lib.js': True,
    'yt.solver.bun.lib.js': True,
    'yt.solver.core.min.js': False,
    'yt.solver.core.js': True,
}

EJS_TEMPLATE = '''\
# This file is generated by devscripts/update_requirements.py. DO NOT MODIFY!

VERSION = {version!r}
HASHES = {{
{hash_mapping}
}}
'''


@dataclasses.dataclass
class Target:
    extras: list[str] = dataclasses.field(default_factory=list)
    groups: list[str] = dataclasses.field(default_factory=list)
    prune_packages: list[str] = dataclasses.field(default_factory=list)
    omit_packages: list[str] = dataclasses.field(default_factory=list)


LINUX_TARGET = Target(
    extras=['default', 'curl-cffi', 'secretstorage'],
    groups=['pyinstaller'],
)
WIN64_TARGET = Target(
    extras=['default', 'curl-cffi'],
)

BUNDLE_TARGETS = {
    'linux-x86_64': LINUX_TARGET,
    'linux-aarch64': LINUX_TARGET,
    'linux-armv7l': LINUX_TARGET,
    'musllinux-x86_64': LINUX_TARGET,
    'musllinux-aarch64': LINUX_TARGET,
    'win-x64': WIN64_TARGET,
    'win-arm64': WIN64_TARGET,
    'win-x86': Target(extras=['default']),
    'macos': Target(
        extras=['default', 'curl-cffi'],
        # NB: Resolve delocate and PyInstaller together since they share dependencies
        groups=['delocate', 'pyinstaller'],
        # curl-cffi and cffi don't provide universal2 wheels, so only directly install their deps
        omit_packages=['curl-cffi', 'cffi'],
    ),
    # We fuse our own universal2 wheels for curl-cffi+cffi, so we need a separate requirements file
    'macos-curl_cffi': Target(
        extras=['curl-cffi'],
        # Only need curl-cffi+cffi in this requirements file; their deps are installed directly
        # XXX: Try to keep these in sync with curl-cffi's and cffi's transitive dependencies
        prune_packages=['rich'],
        omit_packages=['certifi', 'pycparser'],
    ),
}

PYINSTALLER_BUILDS_TARGETS = {
    'win-x64-pyinstaller': 'win_amd64',
    'win-x86-pyinstaller': 'win32',
    'win-arm64-pyinstaller': 'win_arm64',
}

PYINSTALLER_BUILDS_URL = 'https://api.github.com/repos/yt-dlp/Pyinstaller-Builds/releases/latest'

PYINSTALLER_BUILDS_TMPL = '''\
{}pyinstaller @ {} \\
    --hash={}
'''

PYINSTALLER_VERSION_RE = re.compile(r'pyinstaller-(?P<version>[0-9]+\.[0-9]+\.[0-9]+)-')


def generate_table_lines(
    table_name: str,
    table: dict[str, str | list[str | dict[str, str]]],
) -> collections.abc.Iterator[str]:
    yield f'[{table_name}]\n'
    for name, value in table.items():
        assert isinstance(value, (str, list)), 'only string & array table values are supported'

        if isinstance(value, str):
            yield f'{name} = "{value}"\n'
            continue

        yield f'{name} = ['
        if value:
            yield '\n'
        for element in value:
            yield '    '
            if isinstance(element, dict):
                yield '{ ' + ', '.join(f'{k} = "{v}"' for k, v in element.items()) + ' }'
            else:
                yield f'"{element}"'
            yield ',\n'
        yield ']\n'
    yield '\n'


def replace_table_in_pyproject(
    pyproject_text: str,
    table_name: str,
    table: dict[str, str | list[str | dict[str, str]]],
) -> collections.abc.Iterator[str]:
    INSIDE = 1
    BEYOND = 2

    state = 0
    for line in pyproject_text.splitlines(True):
        if state == INSIDE:
            if line == '\n':
                state = BEYOND
            continue
        if line != f'[{table_name}]\n' or state == BEYOND:
            yield line
            continue
        yield from generate_table_lines(table_name, table)
        state = INSIDE


def modify_and_write_pyproject(
    pyproject_text: str,
    table_name: str,
    table: dict[str, str | list[str | dict[str, str]]],
) -> None:
    with PYPROJECT_PATH.open(mode='w') as f:
        f.writelines(replace_table_in_pyproject(pyproject_text, table_name, table))


def run_uv_export(
    *,
    extras: list[str] | None = None,
    groups: list[str] | None = None,
    prune_packages: list[str] | None = None,
    omit_packages: list[str] | None = None,
    bare: bool = False,
    output_file: pathlib.Path | None = None,
) -> str:
    return run_process(
        'uv', 'export',
        '--no-python-downloads',
        '--quiet',
        '--no-progress',
        '--color=never',
        '--format=requirements.txt',
        '--frozen',
        '--refresh',
        '--no-emit-project',
        '--no-default-groups',
        *(f'--extra={extra}' for extra in (extras or [])),
        *(f'--group={group}' for group in (groups or [])),
        *(f'--prune={package}' for package in (prune_packages or [])),
        *(f'--no-emit-package={package}' for package in (omit_packages or [])),
        *(['--no-annotate', '--no-hashes', '--no-header'] if bare else []),
        *([f'--output-file={output_file.relative_to(BASE_PATH)}'] if output_file else []),
    ).stdout


def run_pip_compile(
    *args: str,
    input_line: str,
    output_file: pathlib.Path | None = None,
    env: dict[str, str] | None = None,
) -> str:
    return run_process(
        'uv', 'pip', 'compile',
        '--no-python-downloads',
        '--quiet',
        '--no-progress',
        '--color=never',
        '--format=requirements.txt',
        '--refresh',
        '--generate-hashes',
        '--no-strip-markers',
        f'--custom-compile-command={CUSTOM_COMPILE_COMMAND}',
        '--universal',
        *args,
        *([f'--output-file={output_file.relative_to(BASE_PATH)}'] if output_file else []),
        '-',  # Read from stdin
        input=f'{input_line}\n',
        env=env,
    ).stdout


def makefile_variables(
    prefix: str,
    filetypes: list[str] | None = None,
    *,
    version: str | None = None,
    name: str | None = None,
    digest: str | None = None,
    data: bytes | None = None,
    keys_only: bool = False,
) -> dict[str, str | None]:

    variables = {
        f'{prefix}_VERSION': version,
        f'{prefix}_WHEEL_NAME': name,
        f'{prefix}_WHEEL_HASH': digest,
    }
    for ft in filetypes or []:
        variables.update({
            f'{prefix}_{ft.upper()}_FOLDERS': None,
            f'{prefix}_{ft.upper()}_FILES': None,
        })

    if keys_only:
        return variables

    assert all(arg is not None for arg in (version, name, digest, not filetypes or data))

    if filetypes:
        with io.BytesIO(data) as buf, zipfile.ZipFile(buf) as zipf:
            for ft in filetypes:
                files, folders = zipf_files_and_folders(zipf, f'*.{ft.lower()}')
                variables[f'{prefix}_{ft.upper()}_FOLDERS'] = ' '.join(folders)
                variables[f'{prefix}_{ft.upper()}_FILES'] = ' '.join(files)

    return variables


def ejs_makefile_variables(**kwargs) -> dict[str, str | None]:
    return makefile_variables('EJS', filetypes=['PY', 'JS'], **kwargs)


def update_ejs(verify: bool = False):
    PACKAGE_NAME = 'yt-dlp-ejs'
    PREFIX = f'    "{PACKAGE_NAME}=='
    LIBRARY_NAME = PACKAGE_NAME.replace('-', '_')
    PACKAGE_PATH = BASE_PATH / 'yt_dlp/extractor/youtube/jsc/_builtin/vendor'
    RELEASE_URL = 'https://api.github.com/repos/yt-dlp/ejs/releases/latest'

    current_version = None
    with PYPROJECT_PATH.open() as file:
        for line in file:
            if not line.startswith(PREFIX):
                continue
            current_version, _, _ = line.removeprefix(PREFIX).partition('"')

    if not current_version:
        print(f'{PACKAGE_NAME} dependency line could not be found')
        return

    makefile_info = ejs_makefile_variables(keys_only=True)
    prefixes = tuple(f'{key} = ' for key in makefile_info)
    with MAKEFILE_PATH.open() as file:
        for line in file:
            if not line.startswith(prefixes):
                continue
            key, _, val = line.partition(' = ')
            makefile_info[key] = val.rstrip()

    info = call_github_api(RELEASE_URL)
    version = info['tag_name']
    if version == current_version:
        print(f'{PACKAGE_NAME} is up to date! ({version})')
        return

    print(f'Updating {PACKAGE_NAME} from {current_version} to {version}')
    hashes = []
    wheel_info = {}
    for asset in info['assets']:
        name = asset['name']
        digest = asset['digest']

        is_wheel = name.startswith(f'{LIBRARY_NAME}-') and name.endswith('.whl')
        if not is_wheel and name not in EJS_ASSETS:
            continue

        with request(asset['browser_download_url']) as resp:
            data = resp.read()

        # verify digest from github
        algo, _, expected = digest.partition(':')
        hexdigest = hashlib.new(algo, data).hexdigest()
        assert hexdigest == expected, f'downloaded attest mismatch ({hexdigest!r} != {expected!r})'

        if is_wheel:
            wheel_info = ejs_makefile_variables(version=version, name=name, digest=digest, data=data)
            continue

        # calculate sha3-512 digest
        asset_hash = hashlib.sha3_512(data).hexdigest()
        hashes.append(f'    {name!r}: {asset_hash!r},')

        if EJS_ASSETS[name]:
            (PACKAGE_PATH / name).write_bytes(data)

    hash_mapping = '\n'.join(hashes)
    for asset_name in EJS_ASSETS:
        assert asset_name in hash_mapping, f'{asset_name} not found in release'

    assert all(wheel_info.get(key) for key in makefile_info), 'wheel info not found in release'

    (PACKAGE_PATH / '_info.py').write_text(EJS_TEMPLATE.format(
        version=version,
        hash_mapping=hash_mapping,
    ))

    content = PYPROJECT_PATH.read_text()
    updated = content.replace(PREFIX + current_version, PREFIX + version)
    PYPROJECT_PATH.write_text(updated)

    makefile = MAKEFILE_PATH.read_text()
    for key in wheel_info:
        makefile = makefile.replace(f'{key} = {makefile_info[key]}', f'{key} = {wheel_info[key]}')
    MAKEFILE_PATH.write_text(makefile)

    update_requirements(upgrade_only=PACKAGE_NAME, verify=verify)


def update_requirements(upgrade_only: str | None = None, verify: bool = False):
    # Are we upgrading all packages or only one (e.g. 'yt-dlp-ejs' or 'protobug')?
    upgrade_arg = f'--upgrade-package={upgrade_only}' if upgrade_only else '--upgrade'

    pyproject_text = PYPROJECT_PATH.read_text()
    pyproject_toml = parse_toml(pyproject_text)
    extras = pyproject_toml['project']['optional-dependencies']

    # Remove pinned extras so they don't muck up the lockfile during generation/upgrade
    for pinned_extra_name in PINNED_EXTRAS:
        extras.pop(pinned_extra_name, None)

    # Write an intermediate pyproject.toml to use for generating lockfile and bundle requirements
    modify_and_write_pyproject(pyproject_text, table_name=EXTRAS_TABLE, table=extras)

    # If verifying, set UV_EXCLUDE_NEWER env var with the last timestamp recorded in uv.lock
    env = None
    if verify:
        env = os.environ.copy()
        env['UV_EXCLUDE_NEWER'] = parse_toml(LOCKFILE_PATH.read_text())['options']['exclude-newer']

    # Generate/upgrade lockfile
    run_process('uv', 'lock', upgrade_arg, env=env)

    # Generate bundle requirements
    if not upgrade_only or upgrade_only.lower() == 'pyinstaller':
        info = call_github_api(PYINSTALLER_BUILDS_URL)
        for target_suffix, asset_tag in PYINSTALLER_BUILDS_TARGETS.items():
            asset_info = next(asset for asset in info['assets'] if asset_tag in asset['name'])
            pyinstaller_version = PYINSTALLER_VERSION_RE.match(asset_info['name']).group('version')
            pyinstaller_builds_deps = run_pip_compile(
                '--no-emit-package=pyinstaller',
                upgrade_arg,
                input_line=f'pyinstaller=={pyinstaller_version}',
                env=env)
            requirements_path = REQUIREMENTS_PATH / REQS_OUTPUT_TMPL.format(target_suffix)
            requirements_path.write_text(PYINSTALLER_BUILDS_TMPL.format(
                pyinstaller_builds_deps, asset_info['browser_download_url'], asset_info['digest']))

    for target_suffix, target in BUNDLE_TARGETS.items():
        run_uv_export(
            extras=target.extras,
            groups=target.groups,
            prune_packages=target.prune_packages,
            omit_packages=target.omit_packages,
            output_file=REQUIREMENTS_PATH / REQS_OUTPUT_TMPL.format(target_suffix))

    run_uv_export(
        groups=['build'],
        output_file=REQUIREMENTS_PATH / REQS_OUTPUT_TMPL.format('pypi-build'))

    run_pip_compile(
        upgrade_arg,
        input_line='pip',
        output_file=REQUIREMENTS_PATH / REQS_OUTPUT_TMPL.format('pip'),
        env=env)

    # Generate pinned extras
    for pinned_name, extra_name in PINNED_EXTRAS.items():
        extras[pinned_name] = run_uv_export(extras=[extra_name], bare=True).splitlines()

    # Write the finalized pyproject.toml
    modify_and_write_pyproject(pyproject_text, table_name=EXTRAS_TABLE, table=extras)


def parse_args():
    import argparse
    parser = argparse.ArgumentParser(description='generate/update lockfile and requirements')
    parser.add_argument(
        'upgrade_only', nargs='?', metavar='PACKAGE',
        help='only upgrade this package. (by default, all packages will be upgraded)')
    parser.add_argument(
        '--verify', action='store_true',
        help='only verify the update(s) using the previously recorded cooldown timestamp')
    return parser.parse_args()


def main():
    args = parse_args()

    if args.upgrade_only in ('ejs', 'yt-dlp-ejs'):
        update_ejs(verify=args.verify)
    else:
        update_requirements(upgrade_only=args.upgrade_only, verify=args.verify)


if __name__ == '__main__':
    main()