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package main

import (
"fmt"
"net"
"net/rpc"
"os/signal"
"runtime"
"sync"
)

//-------------------------------------------------------------------------
// Daemon
//-------------------------------------------------------------------------

type Daemon struct {
acr *Server
acc *AutoCompleteContext
pcache PackageCache
declcache *DeclCache
}

func NewDaemon(network, address string) *Daemon {
d := new(Daemon)
d.acr = NewServer(network, address)
d.pcache = NewPackageCache()
d.declcache = NewDeclCache()
d.acc = NewAutoCompleteContext(d.pcache, d.declcache)
return d
}

func (d *Daemon) DropCache() {
d.pcache = NewPackageCache()
d.declcache = NewDeclCache()
d.acc = NewAutoCompleteContext(d.pcache, d.declcache)
}

var daemon *Daemon

//-------------------------------------------------------------------------
// printBacktrace
//-------------------------------------------------------------------------

var btSync sync.Mutex

func printBacktrace(err interface{}) {
btSync.Lock()
defer btSync.Unlock()
fmt.Printf("panic: %v\n", err)
i := 2
for {
pc, file, line, ok := runtime.Caller(i)
if !ok {
break
}
f := runtime.FuncForPC(pc)
fmt.Printf("%d(%s): %s:%d\n", i-1, f.Name(), file, line)
i++
}
fmt.Println("")
}

//-------------------------------------------------------------------------
// Server_* functions
//
// Corresponding Client_* functions are autogenerated by goremote.
//-------------------------------------------------------------------------

func Server_AutoComplete(file []byte, filename string, cursor int) (a, b, c []string, d int) {
defer func() {
if err := recover(); err != nil {
printBacktrace(err)
a = []string{"PANIC"}
b = a
c = a

// drop cache
daemon.DropCache()
}
}()
a, b, c, d = daemon.acc.Apropos(file, filename, cursor)
return
}

func Server_Close(notused int) int {
daemon.acr.Close()
return 0
}

func Server_Status(notused int) string {
return daemon.acc.Status()
}

func Server_DropCache(notused int) int {
// drop cache
daemon.DropCache()
return 0
}

func Server_Set(key, value string) string {
if key == "" {
return listConfig(&Config)
} else if value == "" {
return listOption(&Config, key)
}
return setOption(&Config, key, value)
}

//-------------------------------------------------------------------------
// Server
//-------------------------------------------------------------------------

const (
SERVER_CLOSE = iota
)

type Server struct {
listener net.Listener
cmd_in chan int
}

func NewServer(network, address string) *Server {
var err error

s := new(Server)
s.listener, err = net.Listen(network, address)
if err != nil {
panic(err.Error())
}
s.cmd_in = make(chan int, 1)
return s
}

func acceptConnections(in chan net.Conn, listener net.Listener) {
for {
c, err := listener.Accept()
if err != nil {
panic(err.Error())
}
in <- c
}
}

func (s *Server) Loop() {
conn_in := make(chan net.Conn)
go acceptConnections(conn_in, s.listener)
for {
// handle connections or server CMDs (currently one CMD)
select {
case c := <-conn_in:
rpc.ServeConn(c)
runtime.GC()
case cmd := <-s.cmd_in:
switch cmd {
case SERVER_CLOSE:
return
}
case sig := <-signal.Incoming:
if IsTerminationSignal(sig) {
return
}
}
}
}

func (s *Server) Close() {
s.cmd_in <- SERVER_CLOSE
}
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