// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.

package storage

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestGcpNativeObjectStorage(t *testing.T) {
	ctx := context.Background()
	bucketName := "test-bucket"
	config := config{
		address:              "storage.gcs.127.0.0.1.nip.io:4443",
		bucketName:           bucketName,
		createBucket:         true,
		useIAM:               false,
		cloudProvider:        "gcpnative",
		useSSL:               false,
		gcpNativeWithoutAuth: true,
	}

	t.Run("test initialize", func(t *testing.T) {
		var err error
		config.bucketName = ""
		_, err = newGcpNativeObjectStorageWithConfig(ctx, &config)
		assert.Error(t, err)
		config.bucketName = bucketName
		_, err = newGcpNativeObjectStorageWithConfig(ctx, &config)
		assert.Equal(t, err, nil)
	})

	t.Run("test load", func(t *testing.T) {
		testCM, err := newGcpNativeObjectStorageWithConfig(ctx, &config)
		assert.Equal(t, err, nil)
		defer testCM.DeleteBucket(ctx, config.bucketName)

		prepareTests := []struct {
			key   string
			value []byte
		}{
			{"abc", []byte("123")},
			{"abcd", []byte("1234")},
			{"key_1", []byte("111")},
			{"key_2", []byte("222")},
			{"key_3", []byte("333")},
		}

		for _, test := range prepareTests {
			err := testCM.PutObject(ctx, config.bucketName, test.key, bytes.NewReader(test.value),
				int64(len(test.value)))
			require.NoError(t, err)
		}

		loadTests := []struct {
			isvalid       bool
			loadKey       string
			expectedValue []byte

			description string
		}{
			{true, "abc", []byte("123"), "load valid key abc"},
			{true, "abcd", []byte("1234"), "load valid key abcd"},
			{true, "key_1", []byte("111"), "load valid key key_1"},
			{true, "key_2", []byte("222"), "load valid key key_2"},
			{true, "key_3", []byte("333"), "load valid key key_3"},
			{false, "key_not_exist", []byte(""), "load invalid key key_not_exist"},
			{false, "/", []byte(""), "load leading slash"},
		}

		for _, test := range loadTests {
			t.Run(test.description, func(t *testing.T) {
				if test.isvalid {
					got, err := testCM.GetObject(ctx, config.bucketName, test.loadKey, 0, 1024)
					assert.NoError(t, err)
					contentData, err := io.ReadAll(got)
					assert.NoError(t, err)
					assert.Equal(t, len(contentData), len(test.expectedValue))
					assert.Equal(t, test.expectedValue, contentData)
					statSize, err := testCM.StatObject(ctx, config.bucketName, test.loadKey)
					assert.NoError(t, err)
					assert.Equal(t, statSize, int64(len(contentData)))
					_, err = testCM.GetObject(ctx, config.bucketName, test.loadKey, 1, 1023)
					assert.NoError(t, err)
				} else {
					got, err := testCM.GetObject(ctx, config.bucketName, test.loadKey, 0, 1024)
					assert.Error(t, err)
					assert.Empty(t, got)
				}
			})
		}

		loadWithPrefixTests := []struct {
			isvalid       bool
			prefix        string
			expectedValue [][]byte

			description string
		}{
			{true, "abc", [][]byte{[]byte("123"), []byte("1234")}, "load with valid prefix abc"},
			{true, "key_", [][]byte{[]byte("111"), []byte("222"), []byte("333")}, "load with valid prefix key_"},
			{true, "prefix", [][]byte{}, "load with valid but not exist prefix prefix"},
		}

		for _, test := range loadWithPrefixTests {
			t.Run(test.description, func(t *testing.T) {
				gotk, _, err := listAllObjectsWithPrefixAtBucket(ctx, testCM, config.bucketName,
					test.prefix, false)
				assert.NoError(t, err)
				assert.Equal(t, len(test.expectedValue), len(gotk))
				for _, key := range gotk {
					err := testCM.RemoveObject(ctx, config.bucketName, key)
					assert.NoError(t, err)
				}
			})
		}
	})

	t.Run("test list", func(t *testing.T) {
		testCM, err := newGcpNativeObjectStorageWithConfig(ctx, &config)
		assert.Equal(t, err, nil)
		defer testCM.DeleteBucket(ctx, config.bucketName)

		prepareTests := []struct {
			valid bool
			key   string
			value []byte
		}{
			{false, "abc/", []byte("123")},
			{true, "abc/d/", []byte("1234")},
			{false, "abc/d/e", []byte("12345")},
			{true, "abc/e/d", []byte("12354")},
			{true, "key_/1/1", []byte("111")},
			{true, "key_/1/2/", []byte("222")},
			{false, "key_/1/2/3", []byte("333")},
			{true, "key_/2/3", []byte("333")},
			{true, "key_/test.txt", []byte("333")},
		}

		for _, test := range prepareTests {
			err := testCM.PutObject(ctx, config.bucketName, test.key, bytes.NewReader(test.value),
				int64(len(test.value)))
			require.Nil(t, err)
			if !test.valid {
				err := testCM.RemoveObject(ctx, config.bucketName, test.key)
				require.Nil(t, err)
			}
		}

		insertWithPrefixTests := []struct {
			recursive     bool
			prefix        string
			expectedValue []string
		}{
			{true, "abc/", []string{"abc/e/d"}},
			{true, "key_/", []string{"key_/1/1", "key_/2/3", "key_/test.txt"}},
			{false, "abc/", []string{}},
			{false, "key_/", []string{"key_/test.txt"}},
		}

		for _, test := range insertWithPrefixTests {
			t.Run(fmt.Sprintf("prefix: %s, recursive: %t", test.prefix, test.recursive), func(t *testing.T) {
				gotk, _, err := listAllObjectsWithPrefixAtBucket(ctx, testCM, config.bucketName,
					test.prefix, test.recursive)
				assert.NoError(t, err)
				assert.Equal(t, len(test.expectedValue), len(gotk))
				for _, key := range gotk {
					assert.Contains(t, test.expectedValue, key)
				}
			})
		}
	})
}

func TestGcpNativeReadFile(t *testing.T) {
	ctx := context.Background()
	bucketName := "test-bucket"
	c := &config{
		address:              "storage.gcs.127.0.0.1.nip.io:4443",
		bucketName:           bucketName,
		createBucket:         true,
		useIAM:               false,
		cloudProvider:        "gcpnative",
		useSSL:               false,
		gcpNativeWithoutAuth: true,
	}
	rcm, err := NewRemoteChunkManager(ctx, c)

	t.Run("Read", func(t *testing.T) {
		filePath := "test-Read"
		data := []byte("Test data for Read.")

		err = rcm.Write(ctx, filePath, data)
		assert.NoError(t, err)
		defer rcm.Remove(ctx, filePath)

		reader, err := rcm.Reader(ctx, filePath)
		assert.NoError(t, err)

		buffer := make([]byte, 4)
		n, err := reader.Read(buffer)
		assert.NoError(t, err)
		assert.Equal(t, 4, n)
		assert.Equal(t, "Test", string(buffer))

		buffer = make([]byte, 6)
		n, err = reader.Read(buffer)
		assert.NoError(t, err)
		assert.Equal(t, 6, n)
		assert.Equal(t, " data ", string(buffer))

		buffer = make([]byte, 40)
		n, err = reader.Read(buffer)
		assert.Error(t, err)
		assert.Equal(t, 9, n)
		assert.Equal(t, "for Read.", string(buffer[:9]))
	})

	t.Run("ReadAt", func(t *testing.T) {
		filePath := "test-ReadAt"
		data := []byte("Test data for ReadAt.")

		err = rcm.Write(ctx, filePath, data)
		assert.NoError(t, err)
		defer rcm.Remove(ctx, filePath)

		reader, err := rcm.Reader(ctx, filePath)
		assert.NoError(t, err)

		buffer := make([]byte, 4)
		n, err := reader.ReadAt(buffer, 5)
		assert.NoError(t, err)
		assert.Equal(t, 4, n)
		assert.Equal(t, "data", string(buffer))

		buffer = make([]byte, 4)
		n, err = reader.Read(buffer)
		assert.NoError(t, err)
		assert.Equal(t, 4, n)
		assert.Equal(t, "Test", string(buffer))

		buffer = make([]byte, 4)
		n, err = reader.ReadAt(buffer, 20)
		assert.Error(t, err)
		assert.Equal(t, 1, n)
		assert.Equal(t, ".", string(buffer[:1]))

		buffer = make([]byte, 4)
		n, err = reader.ReadAt(buffer, 25)
		assert.Error(t, err)
		assert.Equal(t, 0, n)
	})

	t.Run("Seek start", func(t *testing.T) {
		filePath := "test-SeekStart"
		data := []byte("Test data for Seek start.")

		err = rcm.Write(ctx, filePath, data)
		assert.NoError(t, err)
		defer rcm.Remove(ctx, filePath)

		reader, err := rcm.Reader(ctx, filePath)
		assert.NoError(t, err)

		offset, err := reader.Seek(10, io.SeekStart)
		assert.NoError(t, err)
		assert.Equal(t, int64(10), offset)

		buffer := make([]byte, 4)
		n, err := reader.Read(buffer)
		assert.NoError(t, err)
		assert.Equal(t, 4, n)
		assert.Equal(t, "for ", string(buffer))

		offset, err = reader.Seek(40, io.SeekStart)
		assert.NoError(t, err)
		assert.Equal(t, int64(40), offset)

		buffer = make([]byte, 4)
		n, err = reader.Read(buffer)
		assert.Error(t, err)
		assert.Equal(t, 0, n)
	})

	t.Run("Seek current", func(t *testing.T) {
		filePath := "test-SeekCurrent"
		data := []byte("Test data for Seek current.")

		err = rcm.Write(ctx, filePath, data)
		assert.NoError(t, err)
		defer rcm.Remove(ctx, filePath)

		reader, err := rcm.Reader(ctx, filePath)
		assert.NoError(t, err)

		buffer := make([]byte, 4)
		n, err := reader.Read(buffer)
		assert.NoError(t, err)
		assert.Equal(t, 4, n)
		assert.Equal(t, "Test", string(buffer))

		offset, err := reader.Seek(10, io.SeekCurrent)
		assert.NoError(t, err)
		assert.Equal(t, int64(14), offset)

		buffer = make([]byte, 4)
		n, err = reader.Read(buffer)
		assert.NoError(t, err)
		assert.Equal(t, 4, n)
		assert.Equal(t, "Seek", string(buffer))

		offset, err = reader.Seek(40, io.SeekCurrent)
		assert.NoError(t, err)
		assert.Equal(t, int64(58), offset)

		buffer = make([]byte, 4)
		n, err = reader.Read(buffer)
		assert.Error(t, err)
		assert.Equal(t, 0, n)
	})

	t.Run("Seek end", func(t *testing.T) {
		filePath := "test-SeekEnd"
		data := []byte("Test data for Seek end.")

		err = rcm.Write(ctx, filePath, data)
		assert.NoError(t, err)
		defer rcm.Remove(ctx, filePath)

		reader, err := rcm.Reader(ctx, filePath)
		assert.NoError(t, err)

		buffer := make([]byte, 4)
		n, err := reader.Read(buffer)
		assert.NoError(t, err)
		assert.Equal(t, 4, n)
		assert.Equal(t, "Test", string(buffer))

		offset, err := reader.Seek(10, io.SeekEnd)
		assert.NoError(t, err)
		assert.Equal(t, int64(33), offset)

		buffer = make([]byte, 4)
		n, err = reader.Read(buffer)
		assert.Error(t, err)
		assert.Equal(t, 0, n)

		offset, err = reader.Seek(10, 3) // Invalid whence
		assert.Error(t, err)
		assert.Equal(t, int64(0), offset)
	})

	t.Run("Close", func(t *testing.T) {
		filePath := "test-Close"
		data := []byte("Test data for Close.")

		err = rcm.Write(ctx, filePath, data)
		assert.NoError(t, err)
		defer rcm.Remove(ctx, filePath)

		reader, err := rcm.Reader(ctx, filePath)
		assert.NoError(t, err)

		err = reader.Close()
		assert.NoError(t, err)
	})
}