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package main

import (
"flag"
"fmt"
"io/ioutil"
"net/rpc"
"os"
"path/filepath"
"strconv"
"time"
)

func do_client() int {
addr := *g_addr
if *g_sock == "unix" {
addr = get_socket_filename()
}

// client
client, err := rpc.Dial(*g_sock, addr)
if err != nil {
if *g_sock == "unix" && file_exists(addr) {
os.Remove(addr)
}

err = try_run_server()
if err != nil {
fmt.Printf("%s\n", err.Error())
return 1
}
client, err = try_to_connect(*g_sock, addr)
if err != nil {
fmt.Printf("%s\n", err.Error())
return 1
}
}
defer client.Close()

if flag.NArg() > 0 {
switch flag.Arg(0) {
case "autocomplete":
cmd_auto_complete(client)
case "close":
cmd_close(client)
case "status":
cmd_status(client)
case "drop-cache":
cmd_drop_cache(client)
case "set":
cmd_set(client)
}
}
return 0
}

func try_run_server() error {
path := get_executable_filename()
args := []string{os.Args[0], "-s", "-sock", *g_sock, "-addr", *g_addr}
cwd, _ := os.Getwd()
procattr := os.ProcAttr{Dir: cwd, Env: os.Environ(), Files: []*os.File{nil, nil, nil}}
p, err := os.StartProcess(path, args, &procattr)

if err != nil {
return err
}
return p.Release()
}

func try_to_connect(network, address string) (client *rpc.Client, err error) {
t := 0
for {
client, err = rpc.Dial(network, address)
if err != nil && t < 1000 {
time.Sleep(10 * time.Millisecond)
t += 10
continue
}
break
}

return
}

//-------------------------------------------------------------------------
// commands
//-------------------------------------------------------------------------

func cmd_status(c *rpc.Client) {
fmt.Printf("%s\n", client_status(c, 0))
}

func cmd_auto_complete(c *rpc.Client) {
var file []byte
var err error

if *g_input != "" {
file, err = ioutil.ReadFile(*g_input)
} else {
file, err = ioutil.ReadAll(os.Stdin)
}

if err != nil {
panic(err.Error())
}

var skipped int
file, skipped = filter_out_shebang(file)

filename := *g_input
cursor := -1

offset := ""
switch flag.NArg() {
case 2:
offset = flag.Arg(1)
case 3:
filename = flag.Arg(1) // Override default filename
offset = flag.Arg(2)
}

if offset != "" {
if offset[0] == 'c' || offset[0] == 'C' {
cursor, _ = strconv.Atoi(offset[1:])
cursor = char_to_byte_offset(file, cursor)
} else {
cursor, _ = strconv.Atoi(offset)
}
}

cursor -= skipped
if filename != "" && !filepath.IsAbs(filename) {
cwd, _ := os.Getwd()
filename = filepath.Join(cwd, filename)
}

f := get_formatter(*g_format)
f.write_candidates(client_auto_complete(c, file, filename, cursor))
}

func cmd_close(c *rpc.Client) {
client_close(c, 0)
}

func cmd_drop_cache(c *rpc.Client) {
client_drop_cache(c, 0)
}

func cmd_set(c *rpc.Client) {
switch flag.NArg() {
case 1:
fmt.Print(client_set(c, "\x00", "\x00"))
case 2:
fmt.Print(client_set(c, flag.Arg(1), "\x00"))
case 3:
fmt.Print(client_set(c, flag.Arg(1), flag.Arg(2)))
}
}
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