#!/usr/bin/env python2.7
from __future__ import absolute_import

import hashlib
import random
import shutil
import tempfile
import time
import unittest

import silenttestrunner

from hgext.extlib.cstore import (
    datapackstore,
)

from hgext.remotefilelog.datapack import (
    fastdatapack,
    mutabledatapack,
)

from mercurial.node import nullid
import mercurial.ui

class datapackstoretests(unittest.TestCase):
    def setUp(self):
        random.seed(0)
        self.tempdirs = []

    def tearDown(self):
        for d in self.tempdirs:
            shutil.rmtree(d)

    def makeTempDir(self):
        tempdir = tempfile.mkdtemp()
        self.tempdirs.append(tempdir)
        return tempdir

    def getHash(self, content):
        return hashlib.sha1(content).digest()

    def getFakeHash(self):
        return ''.join(chr(random.randint(0, 255)) for _ in range(20))

    def createPack(self, packdir, revisions=None):
        if revisions is None:
            revisions = [("filename", self.getFakeHash(), nullid, "content")]

        packer = mutabledatapack(mercurial.ui.ui(), packdir)

        for filename, node, base, content in revisions:
            packer.add(filename, node, base, content)

        path = packer.close()
        return fastdatapack(path)

    def testGetDeltaChainSingleRev(self):
        """Test getting a 1-length delta chain."""
        packdir = self.makeTempDir()

        revisions = [("foo", self.getFakeHash(), nullid, "content")]
        self.createPack(packdir, revisions=revisions)

        store = datapackstore(packdir)

        chain = store.getdeltachain(revisions[0][0], revisions[0][1])
        self.assertEquals(1, len(chain))
        self.assertEquals("content", chain[0][4])

    def testGetDeltaChainMultiRev(self):
        """Test getting a 2-length delta chain."""
        packdir = self.makeTempDir()

        firsthash = self.getFakeHash()
        revisions = [
            ("foo", firsthash, nullid, "content"),
            ("foo", self.getFakeHash(), firsthash, "content2"),
        ]
        self.createPack(packdir, revisions=revisions)

        store = datapackstore(packdir)

        chain = store.getdeltachain(revisions[1][0], revisions[1][1])
        self.assertEquals(2, len(chain))
        self.assertEquals("content2", chain[0][4])
        self.assertEquals("content", chain[1][4])

    def testGetDeltaChainMultiPack(self):
        """Test getting chains from multiple packs."""
        packdir = self.makeTempDir()

        revisions1 = [
            ("foo", self.getFakeHash(), nullid, "content"),
        ]
        self.createPack(packdir, revisions=revisions1)

        revisions2 = [
            ("foo", self.getFakeHash(), revisions1[0][1], "content2"),
        ]
        self.createPack(packdir, revisions=revisions2)

        store = datapackstore(packdir)

        chain1 = store.getdeltachain(revisions2[0][0], revisions2[0][1])
        self.assertEquals(1, len(chain1))
        self.assertEquals("content2", chain1[0][4])

        chain2 = store.getdeltachain(chain1[0][2], chain1[0][3])
        self.assertEquals(1, len(chain2))
        self.assertEquals("content", chain2[0][4])

    def testGetMissing(self):
        packdir = self.makeTempDir()

        revisions = [("foo", self.getFakeHash(), nullid, "content")]
        self.createPack(packdir, revisions=revisions)

        store = datapackstore(packdir)

        missinghash1 = self.getFakeHash()
        missinghash2 = self.getFakeHash()
        missing = store.getmissing([
            (revisions[0][0], revisions[0][1]),
            ("foo", missinghash1),
            ("foo2", missinghash2),
        ])
        self.assertEquals(2, len(missing))
        self.assertEquals(set([("foo", missinghash1), ("foo2", missinghash2)]),
                          set(missing))

    def testRefreshPacks(self):
        packdir = self.makeTempDir()

        revisions = [("foo", self.getFakeHash(), nullid, "content")]
        self.createPack(packdir, revisions=revisions)
        store = datapackstore(packdir)

        missing = store.getmissing([
            (revisions[0][0], revisions[0][1])])
        self.assertEquals(0, len(missing))

        revisions2 = [("foo2", self.getFakeHash(), nullid, "content")]
        self.createPack(packdir, revisions=revisions2)

        # First miss should guarantee a refresh
        missing = store.getmissing([
            (revisions2[0][0], revisions2[0][1])])
        self.assertEquals(0, len(missing))

        revisions3 = [("foo3", self.getFakeHash(), nullid, "content")]
        self.createPack(packdir, revisions=revisions3)

        # Second miss should guarantee a refresh after 100ms.
        # Use a busy loop since we listen to the clock timer internally.
        now = time.time()
        while time.time() - now < 0.2:
            continue
        missing = store.getmissing([
            (revisions3[0][0], revisions3[0][1])])
        self.assertEquals(0, len(missing))

if __name__ == '__main__':
    silenttestrunner.main(__name__)