# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, # You can obtain one at http://mozilla.org/MPL/2.0/.

import fnmatch
import json
import multiprocessing
import os
import re
import subprocess
import sys
import tempfile
import time
import uuid
from functools import partial
from pprint import pprint

import mozpack.path as mozpath
import sentry_sdk
import yaml
from mach.decorators import Command, CommandArgument, SubCommand
from mach.registrar import Registrar
from mozbuild.util import memoize

here = os.path.abspath(os.path.dirname(__file__))
topsrcdir = os.path.abspath(os.path.dirname(os.path.dirname(here)))
DOC_ROOT = os.path.join(topsrcdir, "docs")
BASE_LINK = "http://gecko-docs.mozilla.org-l1.s3-website.us-west-2.amazonaws.com/"


# Helps manage in-tree documentation.


@Command(
    "doc",
    category="devenv",
    virtualenv_name="docs",
    description="Generate and serve documentation from the tree.",
)
@CommandArgument(
    "path",
    default=None,
    metavar="DIRECTORY",
    nargs="?",
    help="Path to documentation to build and display.",
)
@CommandArgument(
    "--format", default="html", dest="fmt", help="Documentation format to write."
)
@CommandArgument(
    "--outdir", default=None, metavar="DESTINATION", help="Where to write output."
)
@CommandArgument(
    "--archive",
    action="store_true",
    help="Write a gzipped tarball of generated docs.",
)
@CommandArgument(
    "--no-open",
    dest="auto_open",
    default=True,
    action="store_false",
    help="Don't automatically open HTML docs in a browser.",
)
@CommandArgument(
    "--no-serve",
    dest="serve",
    default=True,
    action="store_false",
    help="Don't serve the generated docs after building.",
)
@CommandArgument(
    "--http",
    default="localhost:5500",
    metavar="ADDRESS",
    help="Serve documentation on the specified host and port, "
    'default "localhost:5500".',
)
@CommandArgument("--upload", action="store_true", help="Upload generated files to S3.")
@CommandArgument(
    "-j",
    "--jobs",
    default=str(multiprocessing.cpu_count()),
    dest="jobs",
    help="Distribute the build over N processes in parallel.",
)
@CommandArgument("--write-url", default=None, help="Write S3 Upload URL to text file")
@CommandArgument(
    "--linkcheck", action="store_true", help="Check if the links are still valid"
)
@CommandArgument(
    "--dump-trees", default=None, help="Dump the Sphinx trees to specified file."
)
@CommandArgument(
    "--fatal-warnings",
    dest="enable_fatal_warnings",
    action="store_true",
    help="Enable fatal warnings.",
)
@CommandArgument(
    "--check-num-warnings",
    action="store_true",
    help="Check that the upper bound on the number of warnings is respected.",
)
@CommandArgument("--verbose", action="store_true", help="Run Sphinx in verbose mode")
@CommandArgument(
    "--no-autodoc",
    action="store_true",
    help="Disable generating Python/JS API documentation",
)
def build_docs(
    command_context,
    path=None,
    fmt="html",
    outdir=None,
    auto_open=True,
    serve=True,
    http=None,
    archive=False,
    upload=False,
    jobs=None,
    write_url=None,
    linkcheck=None,
    dump_trees=None,
    enable_fatal_warnings=False,
    check_num_warnings=False,
    verbose=None,
    no_autodoc=False,
):
    # TODO: Bug 1704891 - move the ESLint setup tools to a shared place.
    import setup_helper

    setup_helper.set_project_root(command_context.topsrcdir)

    if not setup_helper.check_node_executables_valid():
        return 1

    setup_helper.eslint_maybe_setup()

    # Set the path so that Sphinx can find jsdoc, unfortunately there isn't
    # a way to pass this to Sphinx itself at the moment.
    os.environ["PATH"] = (
        mozpath.join(command_context.topsrcdir, "node_modules", ".bin")
        + os.pathsep
        + _node_path()
        + os.pathsep
        + os.environ["PATH"]
    )

    import webbrowser

    from livereload import Server

    from moztreedocs.package import create_tarball

    unique_id = "%s/%s" % (project(), str(uuid.uuid1()))

    outdir = outdir or os.path.join(command_context.topobjdir, "docs")
    savedir = os.path.join(outdir, fmt)

    if path is None:
        path = command_context.topsrcdir
        if os.environ.get("MOZ_AUTOMATION") != "1":
            print(
                "\nBuilding the full documentation tree.\n"
                "Did you mean to only build part of the documentation?\n"
                "For a faster command, consider running:\n"
                " ./mach doc path/to/docs\n"
            )
    path = os.path.normpath(os.path.abspath(path))

    docdir = _find_doc_dir(path)
    if not docdir:
        print(_dump_sphinx_backtrace())
        return die(
            "failed to generate documentation:\n"
            "%s: could not find docs at this location" % path
        )

    if linkcheck:
        # We want to verify if the links are valid or not
        fmt = "linkcheck"
    if no_autodoc:
        if check_num_warnings:
            return die(
                "'--no-autodoc' flag may not be used with '--check-num-warnings'"
            )
        toggle_no_autodoc()

    status, warnings = _run_sphinx(docdir, savedir, fmt=fmt, jobs=jobs, verbose=verbose)
    if status != 0:
        print(_dump_sphinx_backtrace())
        return die(
            "failed to generate documentation:\n"
            "%s: sphinx return code %d" % (path, status)
        )
    else:
        print("\nGenerated documentation:\n%s" % savedir)
    msg = ""

    if enable_fatal_warnings:
        fatal_warnings = _check_sphinx_fatal_warnings(warnings)
        if fatal_warnings:
            msg += f"Error: Got fatal warnings:\n{''.join(fatal_warnings)}"
    if check_num_warnings:
        num_new = _check_sphinx_num_warnings(warnings)
        if num_new:
            msg += f"Error: {num_new} new warnings"
    if msg:
        return die(f"failed to generate documentation:\n {msg}")

    # Upload the artifact containing the link to S3
    # This would be used by code-review to post the link to Phabricator
    if write_url is not None:
        unique_link = BASE_LINK + unique_id + "/index.html"
        with open(write_url, "w") as fp:
            fp.write(unique_link)
            fp.flush()
        print("Generated " + write_url)

    if dump_trees is not None:
        parent = os.path.dirname(dump_trees)
        if parent and not os.path.isdir(parent):
            os.makedirs(parent)
        with open(dump_trees, "w") as fh:
            json.dump(manager().trees, fh)

    if archive:
        archive_path = os.path.join(outdir, "%s.tar.gz" % project())
        create_tarball(archive_path, savedir)
        print("Archived to %s" % archive_path)

    if upload:
        _s3_upload(savedir, project(), unique_id, version())

    if not serve:
        index_path = os.path.join(savedir, "index.html")
        if auto_open and os.path.isfile(index_path):
            webbrowser.open(index_path)
        return

    # Create livereload server. Any files modified in the specified docdir
    # will cause a re-build and refresh of the browser (if open).
    try:
        host, port = http.split(":", 1)
        port = int(port)
    except ValueError:
        return die("invalid address: %s" % http)

    server = Server()

    sphinx_trees = manager().trees or {savedir: docdir}
    for _, src in sphinx_trees.items():
        run_sphinx = partial(
            _run_sphinx, src, savedir, fmt=fmt, jobs=jobs, verbose=verbose
        )
        server.watch(src, run_sphinx)
    server.serve(
        host=host,
        port=port,
        root=savedir,
        open_url_delay=0.1 if auto_open else None,
    )


def _dump_sphinx_backtrace():
    """
    If there is a sphinx dump file, read and return
    its content.
    By default, it isn't displayed.
    """
    pattern = "sphinx-err-*"
    output = ""
    tmpdir = "/tmp"

    if not os.path.isdir(tmpdir):
        # Only run it on Linux
        return
    files = os.listdir(tmpdir)
    for name in files:
        if fnmatch.fnmatch(name, pattern):
            pathFile = os.path.join(tmpdir, name)
            stat = os.stat(pathFile)
            output += "Name: {0} / Creation date: {1}\n".format(
                pathFile, time.ctime(stat.st_mtime)
            )
            with open(pathFile) as f:
                output += f.read()
    return output


def _run_sphinx(docdir, savedir, config=None, fmt="html", jobs=None, verbose=None):
    import sphinx.cmd.build

    config = config or manager().conf_py_path
    # When running sphinx with sentry, it adds significant overhead
    # and makes the build generation very very very slow
    # So, disable it to generate the doc faster
    sentry_sdk.init(None)
    warn_fd, warn_path = tempfile.mkstemp()
    os.close(warn_fd)
    try:
        args = [
            "-T",
            "-b",
            fmt,
            "-c",
            os.path.dirname(config),
            "-w",
            warn_path,
            docdir,
            savedir,
        ]
        if jobs:
            args.extend(["-j", jobs])
        if verbose:
            args.extend(["-v", "-v"])
        print("Run sphinx with:")
        print(args)
        status = sphinx.cmd.build.build_main(args)
        with open(warn_path) as warn_file:
            warnings = warn_file.readlines()
        return status, warnings
    finally:
        try:
            os.unlink(warn_path)
        except Exception as ex:
            print(ex)


def _check_sphinx_fatal_warnings(warnings):
    with open(os.path.join(DOC_ROOT, "config.yml"), "r") as fh:
        fatal_warnings_src = yaml.safe_load(fh)["fatal warnings"]
    fatal_warnings_regex = [re.compile(item) for item in fatal_warnings_src]
    fatal_warnings = []
    for warning in warnings:
        if any(item.search(warning) for item in fatal_warnings_regex):
            fatal_warnings.append(warning)
    return fatal_warnings


def _check_sphinx_num_warnings(warnings):
    # warnings file contains other strings as well
    num_warnings = len([w for w in warnings if "WARNING" in w])
    with open(os.path.join(DOC_ROOT, "config.yml"), "r") as fh:
        max_num = yaml.safe_load(fh)["max_num_warnings"]
    if num_warnings > max_num:
        return num_warnings - max_num
    return None


def manager():
    from moztreedocs import manager

    return manager


def toggle_no_autodoc():
    import moztreedocs

    moztreedocs._SphinxManager.NO_AUTODOC = True


@memoize
def _read_project_properties():
    import imp

    path = os.path.normpath(manager().conf_py_path)
    with open(path, "r") as fh:
        conf = imp.load_module("doc_conf", fh, path, (".py", "r", imp.PY_SOURCE))

    # Prefer the Mozilla project name, falling back to Sphinx's
    # default variable if it isn't defined.
    project = getattr(conf, "moz_project_name", None)
    if not project:
        project = conf.project.replace(" ", "_")

    return {"project": project, "version": getattr(conf, "version", None)}


def project():
    return _read_project_properties()["project"]


def version():
    return _read_project_properties()["version"]


def _node_path():
    from mozbuild.nodeutil import find_node_executable

    node, _ = find_node_executable()

    return os.path.dirname(node)


def _find_doc_dir(path):
    if os.path.isfile(path):
        return

    valid_doc_dirs = ("doc", "docs")
    for d in valid_doc_dirs:
        p = os.path.join(path, d)
        if os.path.isdir(p):
            path = p

    for index_file in ["index.rst", "index.md"]:
        if os.path.exists(os.path.join(path, index_file)):
            return path


def _s3_upload(root, project, unique_id, version=None):
    # Workaround the issue
    # BlockingIOError: [Errno 11] write could not complete without blocking
    # https://github.com/travis-ci/travis-ci/issues/8920
    import fcntl

    from moztreedocs.package import distribution_files
    from moztreedocs.upload import s3_set_redirects, s3_upload

    fcntl.fcntl(1, fcntl.F_SETFL, 0)

    # Files are uploaded to multiple locations:
    #
    # <project>/latest
    # <project>/<version>
    #
    # This allows multiple projects and versions to be stored in the
    # S3 bucket.

    files = list(distribution_files(root))
    key_prefixes = []
    if version:
        key_prefixes.append("%s/%s" % (project, version))

    # Until we redirect / to main/latest, upload the main docs
    # to the root.
    if project == "main":
        key_prefixes.append("")

    key_prefixes.append(unique_id)

    with open(os.path.join(DOC_ROOT, "config.yml"), "r") as fh:
        redirects = yaml.safe_load(fh)["redirects"]

    redirects = {k.strip("/"): v.strip("/") for k, v in redirects.items()}

    all_redirects = {}

    for prefix in key_prefixes:
        s3_upload(files, prefix)

        # Don't setup redirects for the "version" or "uuid" prefixes since
        # we are exceeding a 50 redirect limit and external things are
        # unlikely to link there anyway (see bug 1614908).
        if (version and prefix.endswith(version)) or prefix == unique_id:
            continue

        if prefix:
            prefix += "/"
        all_redirects.update({prefix + k: prefix + v for k, v in redirects.items()})

    print("Redirects currently staged")
    pprint(all_redirects, indent=1)

    s3_set_redirects(all_redirects)

    unique_link = BASE_LINK + unique_id + "/index.html"
    print("Uploaded documentation can be accessed here " + unique_link)


@SubCommand(
    "doc",
    "mach-telemetry",
    description="Generate documentation from Glean metrics.yaml files",
)
def generate_telemetry_docs(command_context):
    args = [
        sys.executable,
        "-m" "glean_parser",
        "translate",
        "-f",
        "markdown",
        "-o",
        os.path.join(topsrcdir, "python/mach/docs/"),
        os.path.join(topsrcdir, "python/mach/pings.yaml"),
        os.path.join(topsrcdir, "python/mach/metrics.yaml"),
    ]
    metrics_paths = [
        handler.metrics_path
        for handler in Registrar.command_handlers.values()
        if handler.metrics_path is not None
    ]
    args.extend(
        [os.path.join(command_context.topsrcdir, path) for path in set(metrics_paths)]
    )
    subprocess.check_call(args)


@SubCommand(
    "doc",
    "show-targets",
    description="List all reference targets. Requires the docs to have been built.",
)
@CommandArgument(
    "--format", default="html", dest="fmt", help="Documentation format used."
)
@CommandArgument(
    "--outdir", default=None, metavar="DESTINATION", help="Where output was written."
)
def show_reference_targets(command_context, fmt="html", outdir=None):
    command_context.activate_virtualenv()
    command_context.virtualenv_manager.install_pip_requirements(
        os.path.join(here, "requirements.txt")
    )

    import sphinx.ext.intersphinx

    outdir = outdir or os.path.join(command_context.topobjdir, "docs")
    inv_path = os.path.join(outdir, fmt, "objects.inv")

    if not os.path.exists(inv_path):
        return die(
            "object inventory not found: {inv_path}.\n"
            "Rebuild the docs and rerun this command"
        )
    sphinx.ext.intersphinx.inspect_main([inv_path])


def die(msg, exit_code=1):
    msg = "%s: %s" % (sys.argv[0], msg)
    print(msg, file=sys.stderr)
    return exit_code
