// Extensions for Protocol Buffers to create more go like structures.
//
// Copyright (c) 2015, Vastech SA (PTY) LTD. All rights reserved.
// http://github.com/gogo/protobuf/gogoproto
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package command

import (
	"io/ioutil"
	"os"

	"github.com/gogo/protobuf/proto"
	"github.com/gogo/protobuf/protoc-gen-gogo/generator"
	plugin "github.com/gogo/protobuf/protoc-gen-gogo/plugin"

	_ "github.com/gogo/protobuf/plugin/grpc"

	_ "github.com/gogo/protobuf/plugin/defaultcheck"
	_ "github.com/gogo/protobuf/plugin/description"
	_ "github.com/gogo/protobuf/plugin/embedcheck"
	_ "github.com/gogo/protobuf/plugin/enumstringer"
	_ "github.com/gogo/protobuf/plugin/equal"
	_ "github.com/gogo/protobuf/plugin/face"
	_ "github.com/gogo/protobuf/plugin/gostring"
	_ "github.com/gogo/protobuf/plugin/marshalto"
	_ "github.com/gogo/protobuf/plugin/oneofcheck"
	_ "github.com/gogo/protobuf/plugin/populate"
	_ "github.com/gogo/protobuf/plugin/size"
	_ "github.com/gogo/protobuf/plugin/stringer"
	_ "github.com/gogo/protobuf/plugin/union"
	_ "github.com/gogo/protobuf/plugin/unmarshal"

	"github.com/gogo/protobuf/plugin/testgen"

	"go/format"
	"strings"
)

func Read() *plugin.CodeGeneratorRequest {
	g := generator.New()
	data, err := ioutil.ReadAll(os.Stdin)
	if err != nil {
		g.Error(err, "reading input")
	}

	if err := proto.Unmarshal(data, g.Request); err != nil {
		g.Error(err, "parsing input proto")
	}

	if len(g.Request.FileToGenerate) == 0 {
		g.Fail("no files to generate")
	}
	return g.Request
}

func Generate(req *plugin.CodeGeneratorRequest) *plugin.CodeGeneratorResponse {
	// Begin by allocating a generator. The request and response structures are stored there
	// so we can do error handling easily - the response structure contains the field to
	// report failure.
	g := generator.New()
	g.Request = req

	g.CommandLineParameters(g.Request.GetParameter())

	// Create a wrapped version of the Descriptors and EnumDescriptors that
	// point to the file that defines them.
	g.WrapTypes()

	g.SetPackageNames()
	g.BuildTypeNameMap()

	g.GenerateAllFiles()

	gtest := generator.New()

	data, err := proto.Marshal(req)
	if err != nil {
		g.Error(err, "failed to marshal modified proto")
	}
	if err := proto.Unmarshal(data, gtest.Request); err != nil {
		g.Error(err, "parsing modified proto")
	}

	if len(gtest.Request.FileToGenerate) == 0 {
		gtest.Fail("no files to generate")
	}

	gtest.CommandLineParameters(gtest.Request.GetParameter())

	// Create a wrapped version of the Descriptors and EnumDescriptors that
	// point to the file that defines them.
	gtest.WrapTypes()

	gtest.SetPackageNames()
	gtest.BuildTypeNameMap()

	gtest.GeneratePlugin(testgen.NewPlugin())

	for i := 0; i < len(gtest.Response.File); i++ {
		if strings.Contains(*gtest.Response.File[i].Content, `//These tests are generated by github.com/gogo/protobuf/plugin/testgen`) {
			gtest.Response.File[i].Name = proto.String(strings.Replace(*gtest.Response.File[i].Name, ".pb.go", "pb_test.go", -1))
			g.Response.File = append(g.Response.File, gtest.Response.File[i])
		}
	}

	for i := 0; i < len(g.Response.File); i++ {
		formatted, err := format.Source([]byte(g.Response.File[i].GetContent()))
		if err != nil {
			g.Error(err, "go format error")
		}
		fmts := string(formatted)
		g.Response.File[i].Content = &fmts
	}
	return g.Response
}

func Write(resp *plugin.CodeGeneratorResponse) {
	g := generator.New()
	// Send back the results.
	data, err := proto.Marshal(resp)
	if err != nil {
		g.Error(err, "failed to marshal output proto")
	}
	_, err = os.Stdout.Write(data)
	if err != nil {
		g.Error(err, "failed to write output proto")
	}
}