/*
Copyright 2016 The TensorFlow Authors. All Rights Reserved.

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.
*/

package internal

import (
	"bytes"
	"go/format"
	"testing"

	"github.com/golang/protobuf/proto"
	pb "github.com/tensorflow/tensorflow/tensorflow/go/genop/internal/proto/tensorflow/core/framework"
)

func TestGenerateOp(t *testing.T) {
	// TestGenerateOp validates the generated source code for an op.
	// The OpDef for the test cases are simplified forms of real ops.
	testdata := []struct {
		tag    string
		opdef  string
		wanted string
	}{
		{
			tag: "NoOp",
			opdef: `
name: "NoOp"
summary: "No. Op."
`,
			wanted: `
// No. Op.
//
// Returns the created operation.
func NoOp(scope *Scope) (o *tf.Operation) {
	if scope.Err() != nil {
		return
	}
	opspec := tf.OpSpec{
		Type: "NoOp",
	}
	return scope.AddOperation(opspec)
}
`,
		},
		{
			tag: "NoAttributes",
			opdef: `
name: "Add"
input_arg: <
  name: "x"
  type_attr: "T"
>
input_arg: <
  name: "y"
  type_attr: "T"
>
output_arg: <
  name: "z"
  type_attr: "T"
>
attr: <
  name: "T"
  type: "type"
  allowed_values: <
    list: <
      type: DT_FLOAT
      type: DT_INT64
    >
  >
>
summary: "Returns x + y element-wise."
description: "Blah blah",
`,
			wanted: `
// Returns x + y element-wise.
//
// Blah blah
func Add(scope *Scope, x tf.Output, y tf.Output) (z tf.Output) {
	if scope.Err() != nil {
		return
	}
	opspec := tf.OpSpec{
		Type: "Add",
		Input: []tf.Input{
			x, y,
		},
	}
	op := scope.AddOperation(opspec)
	return op.Output(0)
}
`,
		},
		{
			tag: "RequiredAttributes",
			opdef: `
name: "Cast"
input_arg: <
  name: "x"
  type_attr: "SrcT"
>
output_arg: <
  name: "y"
  type_attr: "DstT"
>
attr: <
  name: "SrcT"
  type: "type"
>
attr: <
  name: "DstT"
  type: "type"
>
summary: "Cast x of type SrcT to y of DstT."
`,
			wanted: `
// Cast x of type SrcT to y of DstT.
func Cast(scope *Scope, x tf.Output, DstT tf.DataType) (y tf.Output) {
	if scope.Err() != nil {
		return
	}
	attrs := map[string]interface{}{"DstT": DstT}
	opspec := tf.OpSpec{
		Type: "Cast",
		Input: []tf.Input{
			x,
		},
		Attrs: attrs,
	}
	op := scope.AddOperation(opspec)
	return op.Output(0)
}
`,
		},
		{
			tag: "OptionalAttributes",
			opdef: `
name: "DecodeJpeg"
input_arg: <
  name: "contents"
  description: "0-D.  The JPEG-encoded image."
  type: DT_STRING
>
output_arg: <
  name: "image"
  description: "3-D with shape [height, width, channels]"
  type: DT_UINT8
>
attr: <
  name: "channels"
  type: "int"
  default_value: <
    i: 0
  >
  description: "Number of color channels for the decoded image."
>
attr: <
  name: "fancy_upscaling"
  type: "bool"
  default_value: <
    b: true
  >
  description: "If true use a slower but nicer upscaling of the\nchroma planes (yuv420/422 only)."
>
attr: <
  name: "acceptable_fraction"
  type: "float"
  default_value: <
    f: 1
  >
  description: "The minimum required fraction of lines before a truncated\ninput is accepted."
>
summary: "Decode a JPEG-encoded image to a uint8 tensor."
description: "Norna dorna fjord\nkajorna\nhahaha"
`,
			wanted: `
// DecodeJpegAttr is an optional argument to DecodeJpeg.
type DecodeJpegAttr func(optionalAttr)

// DecodeJpegChannels sets the optional channels attribute to value.
//
// value: Number of color channels for the decoded image.
// If not specified, defaults to 0
func DecodeJpegChannels(value int64) DecodeJpegAttr {
	return func(m optionalAttr) {
		m["channels"] = value
	}
}

// DecodeJpegFancyUpscaling sets the optional fancy_upscaling attribute to value.
//
// value: If true use a slower but nicer upscaling of the
// chroma planes (yuv420/422 only).
// If not specified, defaults to true
func DecodeJpegFancyUpscaling(value bool) DecodeJpegAttr {
	return func(m optionalAttr) {
		m["fancy_upscaling"] = value
	}
}

// DecodeJpegAcceptableFraction sets the optional acceptable_fraction attribute to value.
//
// value: The minimum required fraction of lines before a truncated
// input is accepted.
// If not specified, defaults to 1
func DecodeJpegAcceptableFraction(value float32) DecodeJpegAttr {
	return func(m optionalAttr) {
		m["acceptable_fraction"] = value
	}
}

// Decode a JPEG-encoded image to a uint8 tensor.
//
// Norna dorna fjord
// kajorna
// hahaha
//
// Arguments:
//	contents: 0-D.  The JPEG-encoded image.
//
// Returns 3-D with shape [height, width, channels]
func DecodeJpeg(scope *Scope, contents tf.Output, optional ...DecodeJpegAttr) (image tf.Output) {
	if scope.Err() != nil {
		return
	}
	attrs := map[string]interface{}{}
	for _, a := range optional {
		a(attrs)
	}
	opspec := tf.OpSpec{
		Type: "DecodeJpeg",
		Input: []tf.Input{
			contents,
		},
		Attrs: attrs,
	}
	op := scope.AddOperation(opspec)
	return op.Output(0)
}
`,
		},
		{
			tag: "MultipleOutputs",
			opdef: `
name: "TwoOutputs"
input_arg: <
  name: "input"
  type_attr: "T"
>
output_arg <
  name: "x"
  type_attr: "T"
>
output_arg <
  name: "y"
  type_attr: "T"
>
attr: <
  name: "T"
  type: "type"
>
summary: "Op that produces multiple outputs"
`,
			wanted: `
// Op that produces multiple outputs
func TwoOutputs(scope *Scope, input tf.Output) (x tf.Output, y tf.Output) {
        if scope.Err() != nil {
                return
        }
        opspec := tf.OpSpec{
                Type: "TwoOutputs",
                Input: []tf.Input{
                        input,
                },
        }
        op := scope.AddOperation(opspec)
        return op.Output(0), op.Output(1)
}
`,
		},
		{
			tag: "ListOutput",
			opdef: `
name: "ShapeN"
input_arg: <
  name: "input"
  type_attr: "T"
  number_attr: "N"
>
output_arg: <
  name: "output"
  type_attr: "out_type"
  number_attr: "N"
>
attr: <
  name: "N"
  type: "int"
  has_minimum: true
  minimum: 1
>
attr: <
  name: "T"
  type: "type"
>
attr: <
  name: "out_type"
  type: "type"
  default_value: <
    type: DT_INT32
  >
  allowed_values: <
    list: <
      type: DT_INT32
      type: DT_INT64
    >
  >
>
summary: "Returns shape of tensors."
description: "Some description here."
`,
			wanted: `
// ShapeNAttr is an optional argument to ShapeN.
type ShapeNAttr func(optionalAttr)

// ShapeNOutType sets the optional out_type attribute to value.
// If not specified, defaults to DT_INT32
func ShapeNOutType(value tf.DataType) ShapeNAttr {
	return func(m optionalAttr) {
		m["out_type"] = value
	}
}

// Returns shape of tensors.
//
// Some description here.
func ShapeN(scope *Scope, input []tf.Output, optional ...ShapeNAttr) (output []tf.Output) {
	if scope.Err() != nil {
		return
	}
	attrs := map[string]interface{}{}
	for _, a := range optional {
		a(attrs)
	}
	opspec := tf.OpSpec{
		Type: "ShapeN",
		Input: []tf.Input{
			tf.OutputList(input),
		},
		Attrs: attrs,
	}
	op := scope.AddOperation(opspec)
	if scope.Err() != nil {
		return
	}
	var idx int
	var err error
	if output, idx, err = makeOutputList(op, idx, "output"); err != nil {
		scope.UpdateErr("ShapeN", err)
		return
	}
	return output
}
`,
		},
	}

	for _, test := range testdata {
		t.Run(test.tag, func(t *testing.T) {
			var opdef pb.OpDef
			var buf bytes.Buffer
			if err := proto.UnmarshalText(test.opdef, &opdef); err != nil {
				t.Fatal(err)
			}
			if err := generateFunctionForOp(&buf, &opdef); err != nil {
				t.Fatal(err)
			}
			got, err := format.Source(buf.Bytes())
			if err != nil {
				t.Fatalf("Unable to format: %v\n%s", err, buf.Bytes())
			}
			want, err := format.Source([]byte(test.wanted))
			if err != nil {
				t.Fatalf("Unable to format: %v\n%s", err, test.wanted)
			}
			if !bytes.Equal(got, want) {
				t.Fatalf("Got:\n%s\nWant:\n%s\n", got, want)
			}
		})
	}
}
