import arvados
import arvados_fuse as fuse
import llfuse
import logging
import os
import sys
import unittest
from .. import run_test_server
from ..mount_test_base import MountTestBase

logger = logging.getLogger('arvados.arv-mount')

from performance_profiler import profiled

def fuse_CreateCollection(mounttmp, streams=1, files_per_stream=1, data='x'):
    class Test(unittest.TestCase):
        def runTest(self):
            for i in range(0, streams):
                os.mkdir(os.path.join(mounttmp, "./stream" + str(i)))

                # Create files
                for j in range(0, files_per_stream):
                    with open(os.path.join(mounttmp, "./stream" + str(i), "file" + str(j) +".txt"), "w") as f:
                        f.write(data)

    Test().runTest()

def fuse_ReadContentsFromCollectionWithManyFiles(mounttmp, streams=1, files_per_stream=1, data='x'):
    class Test(unittest.TestCase):
        def runTest(self):
            for i in range(0, streams):
                d1 = llfuse.listdir(os.path.join(mounttmp, 'stream'+str(i)))
                for j in range(0, files_per_stream):
                    with open(os.path.join(mounttmp, 'stream'+str(i), 'file'+str(i)+'.txt')) as f:
                        self.assertEqual(data, f.read())

    Test().runTest()

def fuse_MoveFileFromCollectionWithManyFiles(mounttmp, stream, filename):
    class Test(unittest.TestCase):
        def runTest(self):
            d1 = llfuse.listdir(os.path.join(mounttmp, stream))
            self.assertIn(filename, d1)

            os.rename(os.path.join(mounttmp, stream, filename), os.path.join(mounttmp, 'moved_from_'+stream+'_'+filename))

            d1 = llfuse.listdir(os.path.join(mounttmp))
            self.assertIn('moved_from_'+stream+'_'+filename, d1)

            d1 = llfuse.listdir(os.path.join(mounttmp, stream))
            self.assertNotIn(filename, d1)

    Test().runTest()

def fuse_DeleteFileFromCollectionWithManyFiles(mounttmp, stream, filename):
    class Test(unittest.TestCase):
        def runTest(self):
            os.remove(os.path.join(mounttmp, stream, filename))

    Test().runTest()

# Create a collection with 2 streams, 3 files_per_stream, 2 blocks_per_file, 2**26 bytes_per_block
class CreateCollectionWithMultipleBlocksAndMoveAndDeleteFile(MountTestBase):
    def setUp(self):
        super(CreateCollectionWithMultipleBlocksAndMoveAndDeleteFile, self).setUp()

    @profiled
    def createCollectionWithMultipleBlocks(self, streams, files_per_stream, data):
        self.pool.apply(fuse_CreateCollection, (self.mounttmp, streams, files_per_stream, data,))

    @profiled
    def readContentsOfCollectionWithMultipleBlocks(self, streams, files_per_stream, data):
        self.pool.apply(fuse_ReadContentsFromCollectionWithManyFiles, (self.mounttmp, streams, files_per_stream, data,))

    @profiled
    def moveFileFromCollectionWithMultipleBlocks(self, streams):
        for i in range(0, streams):
            self.pool.apply(fuse_MoveFileFromCollectionWithManyFiles, (self.mounttmp, 'stream'+str(i), 'file0.txt',))

    @profiled
    def removeFileFromCollectionWithMultipleBlocks(self, streams):
        for i in range(0, streams):
            self.pool.apply(fuse_DeleteFileFromCollectionWithManyFiles, (self.mounttmp, 'stream'+str(i), 'file1.txt'))

    def test_CreateCollectionWithManyBlocksAndMoveAndDeleteFile(self):
        collection = arvados.collection.Collection(api_client=self.api)
        collection.save_new()

        m = self.make_mount(fuse.CollectionDirectory)
        with llfuse.lock:
            m.new_collection(collection.api_response(), collection)
        self.assertTrue(m.writable())

        streams = 2
        files_per_stream = 3
        blocks_per_file = 2
        bytes_per_block = 2**26

        data = 'x' * blocks_per_file * bytes_per_block

        self.createCollectionWithMultipleBlocks(streams, files_per_stream, data)

        collection2 = self.api.collections().get(uuid=collection.manifest_locator()).execute()

        for i in range(0, streams):
            self.assertIn('./stream' + str(i), collection2["manifest_text"])

        for i in range(0, files_per_stream):
            self.assertIn('file' + str(i) + '.txt', collection2["manifest_text"])

        # Read file contents
        self.readContentsOfCollectionWithMultipleBlocks(streams, files_per_stream, data)

        # Move file0.txt out of the streams into .
        self.moveFileFromCollectionWithMultipleBlocks(streams)

        collection2 = self.api.collections().get(uuid=collection.manifest_locator()).execute()

        manifest_streams = collection2['manifest_text'].split('\n')
        self.assertEqual(4, len(manifest_streams))

        for i in range(0, streams):
            self.assertIn('file0.txt', manifest_streams[0])

        for i in range(0, streams):
            self.assertNotIn('file0.txt', manifest_streams[i+1])

        for i in range(0, streams):
            for j in range(1, files_per_stream):
                self.assertIn('file' + str(j) + '.txt', manifest_streams[i+1])

        # Delete 'file1.txt' from all the streams
        self.removeFileFromCollectionWithMultipleBlocks(streams)

        collection2 = self.api.collections().get(uuid=collection.manifest_locator()).execute()

        manifest_streams = collection2['manifest_text'].split('\n')
        self.assertEqual(4, len(manifest_streams))

        for i in range(0, streams):
            self.assertIn('file0.txt', manifest_streams[0])

        self.assertNotIn('file1.txt', collection2['manifest_text'])

        for i in range(0, streams):
            for j in range(2, files_per_stream):
                self.assertIn('file' + str(j) + '.txt', manifest_streams[i+1])

# Create a collection with two streams, each with 200 files
class CreateCollectionWithManyFilesAndMoveAndDeleteFile(MountTestBase):
    def setUp(self):
        super(CreateCollectionWithManyFilesAndMoveAndDeleteFile, self).setUp()

    @profiled
    def createCollectionWithManyFiles(self, streams, files_per_stream, data):
        self.pool.apply(fuse_CreateCollection, (self.mounttmp, streams, files_per_stream, data,))

    @profiled
    def readContentsOfCollectionWithManyFiles(self, streams, files_per_stream, data):
        self.pool.apply(fuse_ReadContentsFromCollectionWithManyFiles, (self.mounttmp, streams, files_per_stream, data,))

    @profiled
    def moveFileFromCollectionWithManyFiles(self, streams):
        for i in range(0, streams):
            self.pool.apply(fuse_MoveFileFromCollectionWithManyFiles, (self.mounttmp, 'stream'+str(i), 'file0.txt',))

    @profiled
    def removeFileFromCollectionWithManyFiles(self, streams):
        for i in range(0, streams):
            self.pool.apply(fuse_DeleteFileFromCollectionWithManyFiles, (self.mounttmp, 'stream'+str(i), 'file1.txt'))

    def test_CreateCollectionWithManyFilesAndMoveAndDeleteFile(self):
        collection = arvados.collection.Collection(api_client=self.api)
        collection.save_new()

        m = self.make_mount(fuse.CollectionDirectory)
        with llfuse.lock:
            m.new_collection(collection.api_response(), collection)
        self.assertTrue(m.writable())

        streams = 2
        files_per_stream = 200

        data = 'x'

        self.createCollectionWithManyFiles(streams, files_per_stream, data)

        collection2 = self.api.collections().get(uuid=collection.manifest_locator()).execute()

        for i in range(0, streams):
            self.assertIn('./stream' + str(i), collection2["manifest_text"])

        for i in range(0, files_per_stream):
            self.assertIn('file' + str(i) + '.txt', collection2["manifest_text"])

        # Read file contents
        self.readContentsOfCollectionWithManyFiles(streams, files_per_stream, data)

        # Move file0.txt out of the streams into .
        self.moveFileFromCollectionWithManyFiles(streams)

        collection2 = self.api.collections().get(uuid=collection.manifest_locator()).execute()

        manifest_streams = collection2['manifest_text'].split('\n')
        self.assertEqual(4, len(manifest_streams))

        for i in range(0, streams):
            self.assertIn('file0.txt', manifest_streams[0])

        for i in range(0, streams):
            self.assertNotIn('file0.txt', manifest_streams[i+1])

        for i in range(0, streams):
            for j in range(1, files_per_stream):
                self.assertIn('file' + str(j) + '.txt', manifest_streams[i+1])

        # Delete 'file1.txt' from all the streams
        self.removeFileFromCollectionWithManyFiles(streams)

        collection2 = self.api.collections().get(uuid=collection.manifest_locator()).execute()

        manifest_streams = collection2['manifest_text'].split('\n')
        self.assertEqual(4, len(manifest_streams))

        for i in range(0, streams):
            self.assertIn('file0.txt', manifest_streams[0])

        self.assertNotIn('file1.txt', collection2['manifest_text'])

        for i in range(0, streams):
            for j in range(2, files_per_stream):
                self.assertIn('file' + str(j) + '.txt', manifest_streams[i+1])

def magicDirTest_MoveFileFromCollection(mounttmp, collection1, collection2, stream, filename):
    class Test(unittest.TestCase):
        def runTest(self):
            #os.rename(os.path.join(mounttmp, collection1, stream, filename), os.path.join(mounttmp, collection2, stream, filename))
            os.rename(os.path.join(mounttmp, collection1, filename), os.path.join(mounttmp, collection2, filename))

    Test().runTest()

def magicDirTest_RemoveFileFromCollection(mounttmp, collection1, stream, filename):
    class Test(unittest.TestCase):
        def runTest(self):
            os.remove(os.path.join(mounttmp, collection1, filename))

    Test().runTest()

class UsingMagicDir_CreateCollectionWithManyFilesAndMoveAndDeleteFile(MountTestBase):
    def setUp(self):
        super(UsingMagicDir_CreateCollectionWithManyFilesAndMoveAndDeleteFile, self).setUp()

    @profiled
    def magicDirTest_createCollectionWithManyFiles(self, streams=0, files_per_stream=0, data='x'):
        # Create collection
        collection = arvados.collection.Collection(api_client=self.api)
        for j in range(0, files_per_stream):
            with collection.open("file"+str(j)+".txt", "w") as f:
                f.write(data)
        collection.save_new()
        return collection

    @profiled
    def magicDirTest_readCollectionContents(self, collection, streams=1, files_per_stream=1, data='x'):
        mount_ls = os.listdir(os.path.join(self.mounttmp, collection))

        files = {}
        for j in range(0, files_per_stream):
            files[os.path.join(self.mounttmp, collection, 'file'+str(j)+'.txt')] = data
            #files[os.path.join(self.mounttmp, collection, 'stream'+str(i)+'/file'+str(j)+'.txt')] = data

        for k, v in files.items():
            with open(os.path.join(self.mounttmp, collection, k)) as f:
                self.assertEqual(v, f.read())

    @profiled
    def magicDirTest_moveFileFromCollection(self, from_collection, to_collection):
        self.pool.apply(magicDirTest_MoveFileFromCollection, (self.mounttmp, from_collection.manifest_locator(),
              to_collection.manifest_locator(), 'stream0', 'file0.txt',))
        from_collection.update()
        to_collection.update()

    @profiled
    def magicDirTest_removeFileFromCollection(self, collection):
        self.pool.apply(magicDirTest_RemoveFileFromCollection, (self.mounttmp, collection.manifest_locator(), 'stream0', 'file1.txt',))
        collection.update()

    def test_UsingMagicDirCreateCollectionWithManyFilesAndMoveAndDeleteFile(self):
        streams = 2
        files_per_stream = 200
        data = 'x'

        collection1 = self.magicDirTest_createCollectionWithManyFiles()
        # Create collection with multiple files
        collection2 = self.magicDirTest_createCollectionWithManyFiles(streams, files_per_stream, data)

        # Mount FuseMagicDir
        self.make_mount(fuse.MagicDirectory)

        self.magicDirTest_readCollectionContents(collection2.manifest_locator(), streams, files_per_stream, data)

        # Move file0.txt out of the collection2 into collection1
        self.magicDirTest_moveFileFromCollection(collection2, collection1)
        updated_collection = self.api.collections().get(uuid=collection2.manifest_locator()).execute()
        self.assertFalse('file0.txt' in updated_collection['manifest_text'])
        self.assertTrue('file1.txt' in updated_collection['manifest_text'])

        # Delete file1.txt from collection2
        self.magicDirTest_removeFileFromCollection(collection2)
        updated_collection = self.api.collections().get(uuid=collection2.manifest_locator()).execute()
        self.assertFalse('file1.txt' in updated_collection['manifest_text'])
        self.assertTrue('file2.txt' in updated_collection['manifest_text'])


class UsingMagicDir_CreateCollectionWithManyFilesAndMoveAllFilesIntoAnother(MountTestBase):
    def setUp(self):
        super(UsingMagicDir_CreateCollectionWithManyFilesAndMoveAllFilesIntoAnother, self).setUp()

    @profiled
    def magicDirTestMoveAllFiles_createCollectionWithManyFiles(self, streams=0, files_per_stream=0,
            blocks_per_file=0, bytes_per_block=0, data='x'):
        # Create collection
        collection = arvados.collection.Collection(api_client=self.api)
        for j in range(0, files_per_stream):
            with collection.open("file"+str(j)+".txt", "w") as f:
                f.write(data)
        collection.save_new()
        return collection

    @profiled
    def magicDirTestMoveAllFiles_moveFilesFromCollection(self, from_collection, to_collection, files_per_stream):
        for j in range(0, files_per_stream):
            self.pool.apply(magicDirTest_MoveFileFromCollection, (self.mounttmp, from_collection.manifest_locator(),
                  to_collection.manifest_locator(), 'stream0', 'file'+str(j)+'.txt',))
        from_collection.update()
        to_collection.update()

    def test_UsingMagicDirCreateCollectionWithManyFilesAndMoveAllFilesIntoAnother(self):
        streams = 2
        files_per_stream = 200
        data = 'x'

        collection1 = self.magicDirTestMoveAllFiles_createCollectionWithManyFiles()
        # Create collection with multiple files
        collection2 = self.magicDirTestMoveAllFiles_createCollectionWithManyFiles(streams, files_per_stream, data)

        # Mount FuseMagicDir
        self.make_mount(fuse.MagicDirectory)

        # Move all files from collection2 into collection1
        self.magicDirTestMoveAllFiles_moveFilesFromCollection(collection2, collection1, files_per_stream)

        updated_collection = self.api.collections().get(uuid=collection2.manifest_locator()).execute()
        file_names = ["file%i.txt" % i for i in range(0, files_per_stream)]
        for name in file_names:
          self.assertFalse(name in updated_collection['manifest_text'])

        updated_collection = self.api.collections().get(uuid=collection1.manifest_locator()).execute()
        for name in file_names:
          self.assertTrue(name in updated_collection['manifest_text'])


# Move one file at a time from one collection into another
class UsingMagicDir_CreateCollectionWithManyFilesAndMoveEachFileIntoAnother(MountTestBase):
    def setUp(self):
        super(UsingMagicDir_CreateCollectionWithManyFilesAndMoveEachFileIntoAnother, self).setUp()

    @profiled
    def magicDirTestMoveFiles_createCollectionWithManyFiles(self, streams=0, files_per_stream=0, data='x'):
        # Create collection
        collection = arvados.collection.Collection(api_client=self.api)
        for j in range(0, files_per_stream):
            with collection.open("file"+str(j)+".txt", "w") as f:
                f.write(data)
        collection.save_new()
        return collection

    @profiled
    def magicDirTestMoveFiles_oneEachIntoAnother(self, from_collection, to_collection, files_per_stream):
        for j in range(0, files_per_stream):
            self.pool.apply(magicDirTest_MoveFileFromCollection, (self.mounttmp, from_collection.manifest_locator(),
                  to_collection.manifest_locator(), 'stream0', 'file'+str(j)+'.txt',))
            from_collection.update()
            to_collection.update()

    def test_UsingMagicDirCreateCollectionWithManyFilesAndMoveEachFileIntoAnother(self):
        streams = 2
        files_per_stream = 200
        data = 'x'

        collection1 = self.magicDirTestMoveFiles_createCollectionWithManyFiles()
        # Create collection with multiple files
        collection2 = self.magicDirTestMoveFiles_createCollectionWithManyFiles(streams, files_per_stream, data)

        # Mount FuseMagicDir
        self.make_mount(fuse.MagicDirectory)

        # Move all files from collection2 into collection1
        self.magicDirTestMoveFiles_oneEachIntoAnother(collection2, collection1, files_per_stream)

        updated_collection = self.api.collections().get(uuid=collection2.manifest_locator()).execute()
        file_names = ["file%i.txt" % i for i in range(0, files_per_stream)]
        for name in file_names:
          self.assertFalse(name in updated_collection['manifest_text'])

        updated_collection = self.api.collections().get(uuid=collection1.manifest_locator()).execute()
        for name in file_names:
          self.assertTrue(name in updated_collection['manifest_text'])