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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package core

import (
    "context"

    "encoding/json"

    "github.com/dexon-foundation/dexon/accounts"
    "github.com/dexon-foundation/dexon/common"
    "github.com/dexon-foundation/dexon/common/hexutil"
    "github.com/dexon-foundation/dexon/internal/ethapi"
    "github.com/dexon-foundation/dexon/log"
)

type AuditLogger struct {
    log log.Logger
    api ExternalAPI
}

func (l *AuditLogger) List(ctx context.Context) ([]common.Address, error) {
    l.log.Info("List", "type", "request", "metadata", MetadataFromContext(ctx).String())
    res, e := l.api.List(ctx)
    l.log.Info("List", "type", "response", "data", res)

    return res, e
}

func (l *AuditLogger) New(ctx context.Context) (accounts.Account, error) {
    return l.api.New(ctx)
}

func (l *AuditLogger) SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*ethapi.SignTransactionResult, error) {
    sel := "<nil>"
    if methodSelector != nil {
        sel = *methodSelector
    }
    l.log.Info("SignTransaction", "type", "request", "metadata", MetadataFromContext(ctx).String(),
        "tx", args.String(),
        "methodSelector", sel)

    res, e := l.api.SignTransaction(ctx, args, methodSelector)
    if res != nil {
        l.log.Info("SignTransaction", "type", "response", "data", common.Bytes2Hex(res.Raw), "error", e)
    } else {
        l.log.Info("SignTransaction", "type", "response", "data", res, "error", e)
    }
    return res, e
}

func (l *AuditLogger) Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error) {
    l.log.Info("Sign", "type", "request", "metadata", MetadataFromContext(ctx).String(),
        "addr", addr.String(), "data", common.Bytes2Hex(data))
    b, e := l.api.Sign(ctx, addr, data)
    l.log.Info("Sign", "type", "response", "data", common.Bytes2Hex(b), "error", e)
    return b, e
}

func (l *AuditLogger) Export(ctx context.Context, addr common.Address) (json.RawMessage, error) {
    l.log.Info("Export", "type", "request", "metadata", MetadataFromContext(ctx).String(),
        "addr", addr.Hex())
    j, e := l.api.Export(ctx, addr)
    // In this case, we don't actually log the json-response, which may be extra sensitive
    l.log.Info("Export", "type", "response", "json response size", len(j), "error", e)
    return j, e
}

//func (l *AuditLogger) Import(ctx context.Context, keyJSON json.RawMessage) (Account, error) {
//  // Don't actually log the json contents
//  l.log.Info("Import", "type", "request", "metadata", MetadataFromContext(ctx).String(),
//      "keyJSON size", len(keyJSON))
//  a, e := l.api.Import(ctx, keyJSON)
//  l.log.Info("Import", "type", "response", "addr", a.String(), "error", e)
//  return a, e
//}

func NewAuditLogger(path string, api ExternalAPI) (*AuditLogger, error) {
    l := log.New("api", "signer")
    handler, err := log.FileHandler(path, log.LogfmtFormat())
    if err != nil {
        return nil, err
    }
    l.SetHandler(handler)
    l.Info("Configured", "audit log", path)
    return &AuditLogger{l, api}, nil
}