# 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/.

"""
Replace localized parts of a packaged directory with data from a langpack
directory.
"""

import json
import os

from createprecomplete import generate_precomplete

import mozpack.path as mozpath
from mozpack.chrome.manifest import (
    Manifest,
    ManifestChrome,
    ManifestEntryWithRelPath,
    ManifestLocale,
    is_manifest,
)
from mozpack.copier import FileCopier, Jarrer
from mozpack.errors import errors
from mozpack.files import ComposedFinder, GeneratedFile, ManifestFile
from mozpack.mozjar import JAR_DEFLATED
from mozpack.packager import Component, SimpleManifestSink, SimplePackager
from mozpack.packager.formats import FlatFormatter, JarFormatter, OmniJarFormatter
from mozpack.packager.unpack import UnpackFinder


class LocaleManifestFinder:
    def __init__(self, finder):
        entries = self.entries = []
        bases = self.bases = []

        class MockFormatter:
            def add_interfaces(self, path, content):
                pass

            def add(self, path, content):
                pass

            def add_manifest(self, entry):
                if entry.localized:
                    entries.append(entry)

            def add_base(self, base, addon=False):
                bases.append(base)

        # SimplePackager rejects "manifest foo.manifest" entries with
        # additional flags (such as "manifest foo.manifest application=bar").
        # Those type of entries are used by language packs to work as addons,
        # but are not necessary for the purpose of l10n repacking. So we wrap
        # the finder in order to remove those entries.
        class WrapFinder:
            def __init__(self, finder):
                self._finder = finder

            def find(self, pattern):
                for p, f in self._finder.find(pattern):
                    if isinstance(f, ManifestFile):
                        unwanted = [
                            e for e in f._entries if isinstance(e, Manifest) and e.flags
                        ]
                        if unwanted:
                            f = ManifestFile(
                                f._base, [e for e in f._entries if e not in unwanted]
                            )
                    yield p, f

        sink = SimpleManifestSink(WrapFinder(finder), MockFormatter())
        sink.add(Component(""), "*")
        sink.close(False)

        # Find unique locales used in these manifest entries.
        self.locales = list(
            set(e.id for e in self.entries if isinstance(e, ManifestLocale))
        )


class L10NRepackFormatterMixin:
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._dictionaries = {}

    def add(self, path, file):
        base, relpath = self._get_base(path)
        if path.endswith(".dic"):
            if relpath.startswith("dictionaries/"):
                root, ext = mozpath.splitext(mozpath.basename(path))
                self._dictionaries[root] = path
        elif path.endswith("/built_in_addons.json"):
            data = json.loads(file.open().read())
            data["dictionaries"] = self._dictionaries
            # The GeneratedFile content is only really generated after
            # all calls to formatter.add.
            file = GeneratedFile(lambda: json.dumps(data))
        elif relpath.startswith("META-INF/"):
            # Ignore signatures inside omnijars.  We drop these items: if we
            # don't treat them as omnijar resources, they will be included in
            # the top-level package, and that's not how omnijars are signed (Bug
            # 1750676).  If we treat them as omnijar resources, they will stay
            # in the omnijar, as expected -- but the signatures won't be valid
            # after repacking.  Therefore, drop them.
            return
        super().add(path, file)


def L10NRepackFormatter(klass):
    class L10NRepackFormatter(L10NRepackFormatterMixin, klass):
        pass

    return L10NRepackFormatter


FlatFormatter = L10NRepackFormatter(FlatFormatter)
JarFormatter = L10NRepackFormatter(JarFormatter)
OmniJarFormatter = L10NRepackFormatter(OmniJarFormatter)


def _repack(app_finder, l10n_finder, copier, formatter, non_chrome=set()):
    app = LocaleManifestFinder(app_finder)
    l10n = LocaleManifestFinder(l10n_finder)

    # The code further below assumes there's only one locale replaced with
    # another one.
    if len(app.locales) > 1:
        errors.fatal("Multiple app locales aren't supported: " + ",".join(app.locales))
    if len(l10n.locales) > 1:
        errors.fatal(
            "Multiple l10n locales aren't supported: " + ",".join(l10n.locales)
        )
    locale = app.locales[0]
    l10n_locale = l10n.locales[0]

    # For each base directory, store what path a locale chrome package name
    # corresponds to.
    # e.g., for the following entry under app/chrome:
    #     locale foo en-US path/to/files
    # keep track that the locale path for foo in app is
    # app/chrome/path/to/files.
    # As there may be multiple locale entries with the same base, but with
    # different flags, that tracking takes the flags into account when there
    # are some. Example:
    #     locale foo en-US path/to/files/win os=Win
    #     locale foo en-US path/to/files/mac os=Darwin
    def key(entry):
        if entry.flags:
            return "%s %s" % (entry.name, entry.flags)
        return entry.name

    l10n_paths = {}
    for e in l10n.entries:
        if isinstance(e, ManifestChrome):
            base = mozpath.basedir(e.path, app.bases)
            l10n_paths.setdefault(base, {})
            l10n_paths[base][key(e)] = e.path

    # For chrome and non chrome files or directories, store what langpack path
    # corresponds to a package path.
    paths = {}
    for e in app.entries:
        if isinstance(e, ManifestEntryWithRelPath):
            base = mozpath.basedir(e.path, app.bases)
            if base not in l10n_paths:
                errors.fatal("Locale doesn't contain %s/" % base)
                # Allow errors to accumulate
                continue
            if key(e) not in l10n_paths[base]:
                errors.fatal("Locale doesn't have a manifest entry for '%s'" % e.name)
                # Allow errors to accumulate
                continue
            paths[e.path] = l10n_paths[base][key(e)]

    for pattern in non_chrome:
        for base in app.bases:
            path = mozpath.join(base, pattern)
            left = set(p for p, f in app_finder.find(path))
            right = set(p for p, f in l10n_finder.find(path))
            for p in right:
                paths[p] = p
            for p in left - right:
                paths[p] = None

    # Create a new package, with non localized bits coming from the original
    # package, and localized bits coming from the langpack.
    packager = SimplePackager(formatter)
    for p, f in app_finder:
        if is_manifest(p):
            # Remove localized manifest entries.
            for e in [e for e in f if e.localized]:
                f.remove(e)
        # If the path is one that needs a locale replacement, use the
        # corresponding file from the langpack.
        path = None
        if p in paths:
            path = paths[p]
            if not path:
                continue
        else:
            base = mozpath.basedir(p, paths.keys())
            if base:
                subpath = mozpath.relpath(p, base)
                path = mozpath.normpath(mozpath.join(paths[base], subpath))

        if path:
            files = [f for p, f in l10n_finder.find(path)]
            if not files:
                if base not in non_chrome:
                    finderBase = ""
                    if hasattr(l10n_finder, "base"):
                        finderBase = l10n_finder.base
                    errors.error("Missing file: %s" % os.path.join(finderBase, path))
            else:
                packager.add(path, files[0])
        else:
            packager.add(p, f)

    # Add localized manifest entries from the langpack.
    l10n_manifests = []
    for base in set(e.base for e in l10n.entries):
        m = ManifestFile(base, [e for e in l10n.entries if e.base == base])
        path = mozpath.join(base, "chrome.%s.manifest" % l10n_locale)
        l10n_manifests.append((path, m))
    bases = packager.get_bases()
    for path, m in l10n_manifests:
        base = mozpath.basedir(path, bases)
        packager.add(path, m)
        # Add a "manifest $path" entry in the top manifest under that base.
        m = ManifestFile(base)
        m.add(Manifest(base, mozpath.relpath(path, base)))
        packager.add(mozpath.join(base, "chrome.manifest"), m)

    packager.close()

    # Add any remaining non chrome files.
    for pattern in non_chrome:
        for base in bases:
            for p, f in l10n_finder.find(mozpath.join(base, pattern)):
                if not formatter.contains(p):
                    formatter.add(p, f)

    # Resources in `localization` directories are packaged from the source and then
    # if localized versions are present in the l10n dir, we package them as well
    # keeping the source dir resources as a runtime fallback.
    for p, f in l10n_finder.find("**/localization"):
        if not formatter.contains(p):
            formatter.add(p, f)

    # Transplant jar preloading information.
    for path, log in app_finder.jarlogs.items():
        assert isinstance(copier[path], Jarrer)
        copier[path].preload([l.replace(locale, l10n_locale) for l in log])


def repack(
    source, l10n, extra_l10n={}, non_resources=[], non_chrome=set(), minify=False
):
    """
    Replace localized data from the `source` directory with localized data
    from `l10n` and `extra_l10n`.

    The `source` argument points to a directory containing a packaged
    application (in omnijar, jar or flat form).
    The `l10n` argument points to a directory containing the main localized
    data (usually in the form of a language pack addon) to use to replace
    in the packaged application.
    The `extra_l10n` argument contains a dict associating relative paths in
    the source to separate directories containing localized data for them.
    This can be used to point at different language pack addons for different
    parts of the package application.
    The `non_resources` argument gives a list of relative paths in the source
    that should not be added in an omnijar in case the packaged application
    is in that format.
    The `non_chrome` argument gives a list of file/directory patterns for
    localized files that are not listed in a chrome.manifest.
    If `minify`, `.properties` files are minified.
    """
    app_finder = UnpackFinder(source, minify=minify)
    l10n_finder = UnpackFinder(l10n, minify=minify)
    if extra_l10n:
        finders = {
            "": l10n_finder,
        }
        for base, path in extra_l10n.items():
            finders[base] = UnpackFinder(path, minify=minify)
        l10n_finder = ComposedFinder(finders)
    copier = FileCopier()
    compress = min(app_finder.compressed, JAR_DEFLATED)
    if app_finder.kind == "flat":
        formatter = FlatFormatter(copier)
    elif app_finder.kind == "jar":
        formatter = JarFormatter(copier, compress=compress)
    elif app_finder.kind == "omni":
        formatter = OmniJarFormatter(
            copier, app_finder.omnijar, compress=compress, non_resources=non_resources
        )

    with errors.accumulate():
        _repack(app_finder, l10n_finder, copier, formatter, non_chrome)
    copier.copy(source, skip_if_older=False)
    generate_precomplete(source)
