// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package simdj

import (
	"bytes"
	"io"
	"io/ioutil"
	"path/filepath"
	"testing"

	"github.com/klauspost/compress/zstd"
	"github.com/minio/minio/pkg/s3select/json"
	"github.com/minio/minio/pkg/s3select/sql"
	"github.com/minio/simdjson-go"
)

type tester interface {
	Fatal(args ...interface{})
}

func loadCompressed(t tester, file string) (js []byte) {
	dec, err := zstd.NewReader(nil)
	if err != nil {
		t.Fatal(err)
	}
	defer dec.Close()
	js, err = ioutil.ReadFile(filepath.Join("testdata", file+".json.zst"))
	if err != nil {
		t.Fatal(err)
	}
	js, err = dec.DecodeAll(js, nil)
	if err != nil {
		t.Fatal(err)
	}

	return js
}

var testCases = []struct {
	name  string
	array bool
}{
	{
		name: "parking-citations-10",
	},
}

func TestNDJSON(t *testing.T) {
	if !simdjson.SupportedCPU() {
		t.Skip("Unsupported cpu")
	}

	for _, tt := range testCases {

		t.Run(tt.name, func(t *testing.T) {
			ref := loadCompressed(t, tt.name)

			var err error
			dst := make(chan simdjson.Object, 100)
			dec := NewElementReader(dst, &err, &json.ReaderArgs{ContentType: "json"})
			pj, err := simdjson.ParseND(ref, nil)
			if err != nil {
				t.Fatal(err)
			}
			i := pj.Iter()
			cpy := i
			b, err := cpy.MarshalJSON()
			if err != nil {
				t.Fatal(err)
			}
			if false {
				t.Log(string(b))
			}
			//_ = ioutil.WriteFile(filepath.Join("testdata", tt.name+".json"), b, os.ModePerm)

		parser:
			for {
				var next simdjson.Iter
				typ, err := i.AdvanceIter(&next)
				if err != nil {
					t.Fatal(err)
				}
				switch typ {
				case simdjson.TypeNone:
					close(dst)
					break parser
				case simdjson.TypeRoot:
					typ, obj, err := next.Root(nil)
					if err != nil {
						t.Fatal(err)
					}
					if typ != simdjson.TypeObject {
						if typ == simdjson.TypeNone {
							close(dst)
							break parser
						}
						t.Fatal("Unexpected type:", typ.String())
					}

					o, err := obj.Object(nil)
					if err != nil {
						t.Fatal(err)
					}
					dst <- *o
				default:
					t.Fatal("unexpected type:", typ.String())
				}
			}
			refDec := json.NewReader(ioutil.NopCloser(bytes.NewBuffer(ref)), &json.ReaderArgs{ContentType: "json"})

			for {
				rec, err := dec.Read(nil)
				if err == io.EOF {
					break
				}
				if err != nil {
					t.Error(err)
				}
				want, err := refDec.Read(nil)
				if err != nil {
					t.Error(err)
				}
				var gotB, wantB bytes.Buffer
				opts := sql.WriteCSVOpts{
					FieldDelimiter: ',',
					Quote:          '"',
					QuoteEscape:    '"',
					AlwaysQuote:    false,
				}
				err = rec.WriteCSV(&gotB, opts)
				if err != nil {
					t.Error(err)
				}
				err = want.WriteCSV(&wantB, opts)
				if err != nil {
					t.Error(err)
				}

				if !bytes.Equal(gotB.Bytes(), wantB.Bytes()) {
					t.Errorf("CSV output mismatch.\nwant: %s(%x)\ngot:  %s(%x)", wantB.String(), wantB.Bytes(), gotB.String(), gotB.Bytes())
				}
				gotB.Reset()
				wantB.Reset()

				err = rec.WriteJSON(&gotB)
				if err != nil {
					t.Error(err)
				}
				err = want.WriteJSON(&wantB)
				if err != nil {
					t.Error(err)
				}
				// truncate newline from 'want'
				wantB.Truncate(wantB.Len() - 1)
				if !bytes.Equal(gotB.Bytes(), wantB.Bytes()) {
					t.Errorf("JSON output mismatch.\nwant: %s\ngot:  %s", wantB.String(), gotB.String())
				}
			}
		})
	}
}