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package skynet

import (
"bytes"
"encoding/json"
"fmt"
"io"
"launchpad.net/mgo/v2"
"log"
"os"
"runtime"
"time"
)

// Logger is an interface to any logging utility.
type Logger interface {
// Log the item. Can be anything that is representable as a single JSON object.
Item(item interface{})
// Something has gone horribly wrong - remember what and bomb the program.
Panic(item interface{})

// this function exists only to catch things that are not transitioned
Println(items ...interface{})
}

func MakeJObj(item interface{}) (jobj map[string]interface{}) {
jobj = map[string]interface{}{
"Time": time.Now(),
fmt.Sprintf("%T", item): item,
}
return
}

// MultiLogger is an implementation of the Logger interface thatsends log
// messages out to multiple loggers.
type MultiLogger []Logger

func NewMultiLogger(loggers ...Logger) (ml MultiLogger) {
ml = loggers
return
}
func (ml MultiLogger) Item(item interface{}) {
for _, l := range ml {
l.Item(item)
}
}
func (ml MultiLogger) Println(items ...interface{}) {
for _, l := range ml {
l.Println(items...)
}
}
func (ml MultiLogger) Panic(item interface{}) {
for _, l := range ml {
l.Panic(item)
}
}

// ConsoleLogger is an implementation of the Logger interface that just
// prints to the console.
type ConsoleLogger struct {
l *log.Logger
untransitioned *log.Logger
}

func NewConsoleLogger(w io.Writer) (cl *ConsoleLogger) {
cl = &ConsoleLogger{
l: log.New(w, "skynet: ", log.LstdFlags),
untransitioned: log.New(w, "fix-me: ", log.LstdFlags),
}
return
}
func (cl *ConsoleLogger) Item(item interface{}) {
switch s := item.(type) {
case fmt.Stringer:
cl.l.Print(s)
case string:
cl.l.Print(s)
case error:
cl.l.Print(s)
default:
jobj := MakeJObj(item)
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
enc.Encode(jobj)
cl.l.Print(buf.String())
}

}
func (cl *ConsoleLogger) Println(items ...interface{}) {
cl.untransitioned.Println(items...)
}
func (cl *ConsoleLogger) Panic(item interface{}) {
cl.l.Panic(item)
}

// MongoLogger will archive log items into the specified mongo database.
// It is best of MongoLogger is given a capped collection. However, it
// can do nothing itself to ensure this, with the current state of mgo.
// The collection must be created as capped before any data is inserted.
type MongoLogger struct {
session *mgo.Session
dbName, colName string
uuid string

untransitioned *log.Logger
}

func NewMongoLogger(addr string, dbName, collectionName string, uuid string) (ml *MongoLogger, err error) {
ml = &MongoLogger{
dbName: dbName,
colName: collectionName,
untransitioned: log.New(os.Stderr, "fix-me: ", log.LstdFlags),
uuid: uuid,
}
ml.session, err = mgo.Dial(addr)
if err != nil {
ml.session = nil
}
return
}
func (ml *MongoLogger) Item(item interface{}) {
if ml.session == nil {
return
}
jobj := MakeJObj(item)
jobj["uuid"] = ml.uuid

db := ml.session.DB(ml.dbName)
col := db.C(ml.colName)

err := col.Insert(jobj)
if err != nil {
log.Printf("Could not log %v: %v", jobj, err)
}
}
func (ml *MongoLogger) Println(items ...interface{}) {
ml.Item(fmt.Sprint(items...))
ml.untransitioned.Println(items...)
}
func (ml *MongoLogger) Panic(item interface{}) {
if ml.session == nil {
return
}
var strace []string
for skip := 1; ; skip++ {
pc, file, line, ok := runtime.Caller(skip)
if !ok {
break
}
// if file[len(file)-1] == 'c' {
// continue
// }
f := runtime.FuncForPC(pc)
strace = append(strace, fmt.Sprintf("%s:%d %s()\n", file, line, f.Name()))
}
jobj := map[string]interface{}{
"Panic": map[string]interface{}{
"Item": item,
"Trace": strace,
},
"uuid": ml.uuid,
}

db := ml.session.DB(ml.dbName)
col := db.C(ml.colName)

err := col.Insert(jobj)
if err != nil {
log.Printf("Could not log %v: %v", jobj, err)
}

panic(item)
}
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