#!/usr/bin/env python
# Copyright 2019 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================

import os
import pytest

import mindspore.dataset as ds
from mindspore.mindrecord import FileWriter

CV_FILE_NAME = "./imagenet.mindrecord"
CV1_FILE_NAME = "./imagenet1.mindrecord"


def create_cv_mindrecord(files_num):
    """tutorial for cv dataset writer."""
    if os.path.exists(CV_FILE_NAME):
        os.remove(CV_FILE_NAME)
    if os.path.exists("{}.db".format(CV_FILE_NAME)):
        os.remove("{}.db".format(CV_FILE_NAME))
    writer = FileWriter(CV_FILE_NAME, files_num)
    cv_schema_json = {"file_name": {"type": "string"}, "label": {"type": "int32"}, "data": {"type": "bytes"}}
    data = [{"file_name": "001.jpg", "label": 43, "data": bytes('0xffsafdafda', encoding='utf-8')}]
    writer.add_schema(cv_schema_json, "img_schema")
    writer.add_index(["file_name", "label"])
    writer.write_raw_data(data)
    writer.commit()


def create_diff_schema_cv_mindrecord(files_num):
    """tutorial for cv dataset writer."""
    if os.path.exists(CV1_FILE_NAME):
        os.remove(CV1_FILE_NAME)
    if os.path.exists("{}.db".format(CV1_FILE_NAME)):
        os.remove("{}.db".format(CV1_FILE_NAME))
    writer = FileWriter(CV1_FILE_NAME, files_num)
    cv_schema_json = {"file_name_1": {"type": "string"}, "label": {"type": "int32"}, "data": {"type": "bytes"}}
    data = [{"file_name_1": "001.jpg", "label": 43, "data": bytes('0xffsafdafda', encoding='utf-8')}]
    writer.add_schema(cv_schema_json, "img_schema")
    writer.add_index(["file_name_1", "label"])
    writer.write_raw_data(data)
    writer.commit()


def create_diff_page_size_cv_mindrecord(files_num):
    """tutorial for cv dataset writer."""
    if os.path.exists(CV1_FILE_NAME):
        os.remove(CV1_FILE_NAME)
    if os.path.exists("{}.db".format(CV1_FILE_NAME)):
        os.remove("{}.db".format(CV1_FILE_NAME))
    writer = FileWriter(CV1_FILE_NAME, files_num)
    writer.set_page_size(1 << 26)  # 64MB
    cv_schema_json = {"file_name": {"type": "string"}, "label": {"type": "int32"}, "data": {"type": "bytes"}}
    data = [{"file_name": "001.jpg", "label": 43, "data": bytes('0xffsafdafda', encoding='utf-8')}]
    writer.add_schema(cv_schema_json, "img_schema")
    writer.add_index(["file_name", "label"])
    writer.write_raw_data(data)
    writer.commit()


def test_cv_lack_json():
    """tutorial for cv minderdataset."""
    create_cv_mindrecord(1)
    columns_list = ["data", "file_name", "label"]
    num_readers = 4
    with pytest.raises(Exception):
        ds.MindDataset(CV_FILE_NAME, "no_exist.json", columns_list, num_readers)
    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))


def test_cv_lack_mindrecord():
    """tutorial for cv minderdataset."""
    columns_list = ["data", "file_name", "label"]
    num_readers = 4
    with pytest.raises(Exception, match="does not exist or permission denied"):
        _ = ds.MindDataset("no_exist.mindrecord", columns_list, num_readers)


def test_invalid_mindrecord():
    with open('dummy.mindrecord', 'w') as f:
        f.write('just for test')
    columns_list = ["data", "file_name", "label"]
    num_readers = 4
    with pytest.raises(Exception, match="MindRecordOp init failed"):
        data_set = ds.MindDataset('dummy.mindrecord', columns_list, num_readers)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
        assert num_iter == 0
    os.remove('dummy.mindrecord')


def test_minddataset_lack_db():
    create_cv_mindrecord(1)
    os.remove("{}.db".format(CV_FILE_NAME))
    columns_list = ["data", "file_name", "label"]
    num_readers = 4
    with pytest.raises(Exception, match="MindRecordOp init failed"):
        data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
        assert num_iter == 0
    os.remove(CV_FILE_NAME)


def test_cv_minddataset_pk_sample_error_class_column():
    create_cv_mindrecord(1)
    columns_list = ["data", "file_name", "label"]
    num_readers = 4
    sampler = ds.PKSampler(5, None, True, 'no_exsit_column')
    with pytest.raises(Exception, match="MindRecordOp launch failed"):
        data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers, sampler=sampler)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))


def test_cv_minddataset_pk_sample_exclusive_shuffle():
    create_cv_mindrecord(1)
    columns_list = ["data", "file_name", "label"]
    num_readers = 4
    sampler = ds.PKSampler(2)
    with pytest.raises(Exception, match="sampler and shuffle cannot be specified at the same time."):
        data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers,
                                  sampler=sampler, shuffle=False)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))


def test_cv_minddataset_reader_different_schema():
    create_cv_mindrecord(1)
    create_diff_schema_cv_mindrecord(1)
    columns_list = ["data", "label"]
    num_readers = 4
    with pytest.raises(Exception, match="MindRecordOp init failed"):
        data_set = ds.MindDataset([CV_FILE_NAME, CV1_FILE_NAME], columns_list,
                                  num_readers)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))
    os.remove(CV1_FILE_NAME)
    os.remove("{}.db".format(CV1_FILE_NAME))


def test_cv_minddataset_reader_different_page_size():
    create_cv_mindrecord(1)
    create_diff_page_size_cv_mindrecord(1)
    columns_list = ["data", "label"]
    num_readers = 4
    with pytest.raises(Exception, match="MindRecordOp init failed"):
        data_set = ds.MindDataset([CV_FILE_NAME, CV1_FILE_NAME], columns_list,
                                  num_readers)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))
    os.remove(CV1_FILE_NAME)
    os.remove("{}.db".format(CV1_FILE_NAME))


def test_minddataset_invalidate_num_shards():
    create_cv_mindrecord(1)
    columns_list = ["data", "label"]
    num_readers = 4
    with pytest.raises(Exception) as error_info:
        data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers, True, 1, 2)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    assert 'Input shard_id is not within the required interval of (0 to 0).' in str(error_info)

    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))

def test_minddataset_invalidate_shard_id():
    create_cv_mindrecord(1)
    columns_list = ["data", "label"]
    num_readers = 4
    with pytest.raises(Exception) as error_info:
        data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers, True, 1, -1)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    assert 'Input shard_id is not within the required interval of (0 to 0).' in str(error_info)
    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))


def test_minddataset_shard_id_bigger_than_num_shard():
    create_cv_mindrecord(1)
    columns_list = ["data", "label"]
    num_readers = 4
    with pytest.raises(Exception) as error_info:
        data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers, True, 2, 2)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    assert 'Input shard_id is not within the required interval of (0 to 1).' in str(error_info)

    with pytest.raises(Exception) as error_info:
        data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers, True, 2, 5)
        num_iter = 0
        for _ in data_set.create_dict_iterator():
            num_iter += 1
    assert 'Input shard_id is not within the required interval of (0 to 1).' in str(error_info)

    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))

def test_cv_minddataset_partition_num_samples_equals_0():
    """tutorial for cv minddataset."""
    create_cv_mindrecord(1)
    columns_list = ["data", "label"]
    num_readers = 4

    def partitions(num_shards):
        for partition_id in range(num_shards):
            data_set = ds.MindDataset(CV_FILE_NAME, columns_list, num_readers,
                                      num_shards=num_shards,
                                      shard_id=partition_id, num_samples=0)
            num_iter = 0
            for _ in data_set.create_dict_iterator():
                num_iter += 1
    with pytest.raises(Exception) as error_info:
        partitions(5)
    assert 'num_samples should be a positive integer value, but got num_samples=0' in str(error_info)

    os.remove(CV_FILE_NAME)
    os.remove("{}.db".format(CV_FILE_NAME))