// Copyright 2017-2018 DERO Project. All rights reserved.
// Use of this source code in any form is governed by RESEARCH license.
// license can be found in the LICENSE file.
// GPG: 0F39 E425 8C65 3947 702A  8234 08B2 0360 A03A 9DE8
//
//
// 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 HOLDER 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 rpcserver

// get block template handler not implemented

//import "fmt"
import "context"
import "encoding/hex"
import "encoding/json"

//import	"log"
//import 	"net/http"

import "github.com/intel-go/fastjson"
import "github.com/osamingo/jsonrpc"

import "github.com/arnaucode/derosuite/crypto"
import "github.com/arnaucode/derosuite/blockchain"

type (
	GetBlock_Handler struct{}
	GetBlock_Params  struct {
		Hash   string `json:"hash,omitempty"`   // Monero Daemon breaks if both are provided
		Height uint64 `json:"height,omitempty"` // Monero Daemon breaks if both are provided
	} // no params
	GetBlock_Result struct {
		Blob         string                       `json:"blob"`
		Json         string                       `json:"json"`
		Block_Header blockchain.BlockHeader_Print `json:"block_header"`
		Status       string                       `json:"status"`
	}
)

// TODO
func (h GetBlock_Handler) ServeJSONRPC(c context.Context, params *fastjson.RawMessage) (interface{}, *jsonrpc.Error) {
	var p GetBlock_Params
	var hash crypto.Hash
	var err error

	if errp := jsonrpc.Unmarshal(params, &p); err != nil {
		return nil, errp
	}

	if crypto.HashHexToHash(p.Hash) == hash { // user requested using height
		if p.Height >= chain.Get_Height() {
			return nil, jsonrpc.ErrInvalidParams()
		}

		hash, err = chain.Load_BL_ID_at_Height(p.Height)
		if err != nil { // if err return err
			logger.Warnf("User requested %d height block, chain height %d but err occured %s", p.Height, chain.Get_Height(), err)

			return nil, jsonrpc.ErrInvalidParams()
		}
	} else {
		hash = crypto.HashHexToHash(p.Hash)
	}

	block_header, err := chain.GetBlockHeader(hash)
	if err != nil { // if err return err
		return nil, jsonrpc.ErrInvalidParams()
	}
	bl, err := chain.Load_BL_FROM_ID(hash)
	if err != nil { // if err return err
		return nil, jsonrpc.ErrInvalidParams()
	}

	json_encoded_bytes, err := json.Marshal(bl)
	if err != nil { // if err return err
		return nil, jsonrpc.ErrInvalidParams()
	}
	return GetBlock_Result{ // return success
		Block_Header: block_header,
		Blob:         hex.EncodeToString(bl.Serialize()),
		Json:         string(json_encoded_bytes),
		Status:       "OK",
	}, nil
}