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

import hashlib
import random
import shutil
import tempfile
import unittest

import silenttestrunner

from hgext.extlib.cstore import (
    datapackstore,
    uniondatapackstore,
)

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

from mercurial import mdiff
from mercurial.node import nullid
import mercurial.ui

class uniondatapackstoretests(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 createPackStore(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)

        packer.close()
        return datapackstore(packdir)

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

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

        unionstore = uniondatapackstore([store])

        text = unionstore.get(revisions[0][0], revisions[0][1])
        self.assertEquals("content", text)

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

        rev1 = "content"
        rev2 = "content2"
        firsthash = self.getFakeHash()
        revisions = [
            ("foo", firsthash, nullid, rev1),
            ("foo", self.getFakeHash(), firsthash,
             mdiff.textdiff(rev1, rev2)),
        ]
        store = self.createPackStore(packdir, revisions=revisions)

        unionstore = uniondatapackstore([store])

        text = unionstore.get(revisions[1][0], revisions[1][1])
        self.assertEquals(rev2, text)

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

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

        unionstore = uniondatapackstore([store])

        chain = unionstore.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"),
        ]
        store = self.createPackStore(packdir, revisions=revisions)

        unionstore = uniondatapackstore([store])

        chain = unionstore.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"),
        ]
        store = self.createPackStore(packdir, revisions=revisions1)

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

        unionstore = uniondatapackstore([store])

        chain = unionstore.getdeltachain(revisions2[0][0], revisions2[0][1])
        self.assertEquals(2, len(chain))
        self.assertEquals("content2", chain[0][4])
        self.assertEquals("content", chain[1][4])

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

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

        unionstore = uniondatapackstore([store])

        missinghash1 = self.getFakeHash()
        missinghash2 = self.getFakeHash()
        missing = unionstore.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 testAddRemoveStore(self):
        packdir = self.makeTempDir()
        revisions = [("foo", self.getFakeHash(), nullid, "content")]
        store = self.createPackStore(packdir, revisions=revisions)

        packdir2 = self.makeTempDir()
        revisions2 = [("foo2", self.getFakeHash(), nullid, "content2")]
        store2 = self.createPackStore(packdir2, revisions=revisions2)

        unionstore = uniondatapackstore([store])
        unionstore.addstore(store2)

        # Fetch from store2
        result = unionstore.get('foo2', revisions2[0][1])
        self.assertEquals(result, revisions2[0][3])

        # Drop the store
        unionstore.removestore(store2)

        # Fetch from store1
        result = unionstore.get('foo', revisions[0][1])
        self.assertEquals(result, revisions[0][3])

        # Fetch from missing store2
        try:
            unionstore.get('foo2', revisions2[0][1])
            self.asserFalse(True, "get should've thrown")
        except KeyError:
            pass

class uniondatastorepythontests(uniondatapackstoretests):
    def createPackStore(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 datapack(path)

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

        revisions1 = [
            ("foo", self.getFakeHash(), nullid, "content"),
        ]
        pack1 = self.createPackStore(packdir, revisions=revisions1)

        revisions2 = [
            ("foo", self.getFakeHash(), revisions1[0][1], "content2"),
        ]
        pack2 = self.createPackStore(packdir, revisions=revisions2)

        unionstore = uniondatapackstore([pack1, pack2])

        chain = unionstore.getdeltachain(revisions2[0][0], revisions2[0][1])
        self.assertEquals(2, len(chain))
        self.assertEquals("content2", chain[0][4])
        self.assertEquals("content", chain[1][4])

    def testGetDeltaChainMultiPackPyAndC(self):
        """Test getting chains from multiple packs."""
        packdir1 = self.makeTempDir()
        packdir2 = self.makeTempDir()

        revisions1 = [
            ("foo", self.getFakeHash(), nullid, "content"),
        ]
        store = super(uniondatastorepythontests, self)\
                .createPackStore(packdir1, revisions=revisions1)

        revisions2 = [
            ("foo", self.getFakeHash(), revisions1[0][1], "content2"),
        ]
        pack = self.createPackStore(packdir2, revisions=revisions2)

        unionstore = uniondatapackstore([pack, store])

        chain = unionstore.getdeltachain(revisions2[0][0], revisions2[0][1])
        self.assertEquals(2, len(chain))
        self.assertEquals("content2", chain[0][4])
        self.assertEquals("content", chain[1][4])

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