// RAINBOND, Application Management Platform
// Copyright (C) 2014-2017 Goodrain Co., Ltd.

// This program 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. For any non-GPL usage of Rainbond,
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
// must be obtained first.

// 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 General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.

package log

import (
	"fmt"
	"net/http"
	"time"

	"github.com/go-chi/chi/middleware"
	"github.com/sirupsen/logrus"
)

//NewStructuredLogger new struct
func NewStructuredLogger(logger *logrus.Logger) func(next http.Handler) http.Handler {
	return middleware.RequestLogger(&StructuredLogger{logger})
}

//StructuredLogger StructuredLogger
type StructuredLogger struct {
	Logger *logrus.Logger
}

//NewLogEntry NewLogEntry
func (l *StructuredLogger) NewLogEntry(r *http.Request) middleware.LogEntry {
	entry := &StructuredLoggerEntry{Logger: logrus.NewEntry(l.Logger)}
	logFields := logrus.Fields{}

	logFields["ts"] = time.Now().UTC().Format(time.RFC1123)

	if reqID := middleware.GetReqID(r.Context()); reqID != "" {
		logFields["req_id"] = reqID
	}

	scheme := "http"
	if r.TLS != nil {
		scheme = "https"
	}
	logFields["http_scheme"] = scheme
	logFields["http_proto"] = r.Proto
	logFields["http_method"] = r.Method
	logFields["remote_addr"] = r.RemoteAddr
	logFields["user_agent"] = r.UserAgent()
	logFields["uri"] = fmt.Sprintf("%s://%s%s", scheme, r.Host, r.RequestURI)
	entry.Logger = entry.Logger.WithFields(logFields)
	entry.Logger.Debugln("request started")

	return entry
}

//StructuredLoggerEntry StructuredLoggerEntry
type StructuredLoggerEntry struct {
	Logger logrus.FieldLogger
}

//Write Write
func (l *StructuredLoggerEntry) Write(status, bytes int, header http.Header, elapsed time.Duration, data interface{}) {
	l.Logger = l.Logger.WithFields(logrus.Fields{
		"resp_status": status, "resp_bytes_length": bytes,
		"resp_elapsed_ms": float64(elapsed.Nanoseconds()) / 1000000.0,
	})

	l.Logger.Debugln("request complete")
}

//Panic Panic
func (l *StructuredLoggerEntry) Panic(v interface{}, stack []byte) {
	l.Logger = l.Logger.WithFields(logrus.Fields{
		"stack": string(stack),
		"panic": fmt.Sprintf("%+v", v),
	})
}