# Infinite push

#

# Copyright 2016 Facebook, Inc.

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

"""

    [infinitepush]

    # Server-side option. Used only if indextype=disk.

    # Filesystem path to the index store

    indexpath = PATH

"""

from __future__ import absolute_import

import os

from mercurial import util

from . import indexapi

class fileindexapi(indexapi.indexapi):

    def __init__(self, repo):

        super(fileindexapi, self).__init__()

        self._repo = repo

        root = repo.ui.config('infinitepush', 'indexpath')

        if not root:

            root = os.path.join('scratchbranches', 'index')

        self._nodemap = os.path.join(root, 'nodemap')

        self._bookmarkmap = os.path.join(root, 'bookmarkmap')

        self._metadatamap = os.path.join(root, 'nodemetadatamap')

        self._lock = None

    def __enter__(self):

        self._lock = self._repo.wlock()

        return self

    def __exit__(self, exc_type, exc_val, exc_tb):

        if self._lock:

            self._lock.__exit__(exc_type, exc_val, exc_tb)

    def addbundle(self, bundleid, nodesctx):

        for node in nodesctx:

            nodepath = os.path.join(self._nodemap, node.hex())

            self._write(nodepath, bundleid)

    def addbookmark(self, bookmark, node):

        bookmarkpath = os.path.join(self._bookmarkmap, bookmark)

        self._write(bookmarkpath, node)

    def addmanybookmarks(self, bookmarks):

        for bookmark, node in bookmarks.items():

            self.addbookmark(bookmark, node)

    def deletebookmarks(self, patterns):

        for pattern in patterns:

            for bookmark, _ in self._listbookmarks(pattern):

                bookmarkpath = os.path.join(self._bookmarkmap, bookmark)

                self._delete(bookmarkpath)

    def getbundle(self, node):

        nodepath = os.path.join(self._nodemap, node)

        return self._read(nodepath)

    def getnode(self, bookmark):

        bookmarkpath = os.path.join(self._bookmarkmap, bookmark)

        return self._read(bookmarkpath)

    def getbookmarks(self, query):

        return dict(self._listbookmarks(query))

    def saveoptionaljsonmetadata(self, node, jsonmetadata):

        vfs = self._repo.vfs

        vfs.write(os.path.join(self._metadatamap, node), jsonmetadata)

    def _listbookmarks(self, pattern):

        if pattern.endswith('*'):

            pattern = 're:^' + pattern[:-1] + '.*'

        kind, pat, matcher = util.stringmatcher(pattern)

        prefixlen = len(self._bookmarkmap) + 1

        for dirpath, _, books in self._repo.vfs.walk(self._bookmarkmap):

            for book in books:

                bookmark = os.path.join(dirpath, book)[prefixlen:]

                if not matcher(bookmark):

                    continue

                yield bookmark, self._read(os.path.join(dirpath, book))

    def _write(self, path, value):

        vfs = self._repo.vfs

        dirname = vfs.dirname(path)

        if not vfs.exists(dirname):

            vfs.makedirs(dirname)

        vfs.write(path, value)

    def _read(self, path):

        vfs = self._repo.vfs

        if not vfs.exists(path):

            return None

        return vfs.read(path)

    def _delete(self, path):

        vfs = self._repo.vfs

        if not vfs.exists(path):

            return

        return vfs.unlink(path)