import sys
import re
import os
import subprocess
import random
import telnetlib
import time
import threading
import traceback
import getopt

import inc_cfg as inc
import inc_const as const
import inc_util as util

# Vars
G_EXE = ""        # pjsua executable path
G_INUNIX = False    # flags that test is running in Unix


# Usage string
usage = \
"""
run.py - Automated test driver

Usage:
    run.py [options] MODULE CONFIG
Options:
    --exe, -e           pjsua executable path
    --null-audio, -n    use null audio
Sample:
    run.py -n mod_run.py scripts-run/100_simple.py
"""

# Parse arguments
try:
    opts, args = getopt.getopt(sys.argv[1:], "hne:", ["help", "null-audio", "exe="])
except getopt.GetoptError as err:
    print(str(err))
    print(usage)
    sys.exit(2)
for o, a in opts:
    if o in ("-h", "--help"):
        print(usage)
        sys.exit()
    elif o in ("-n", "--null-audio"):
        inc.HAS_SND_DEV = 0
    elif o in ("-e", "--exe"):
        G_EXE = a
    else:
        print("Unknown options")
        sys.exit(2)

if len(args) != 2:
    print("Invalid arguments")
    print(usage)
    sys.exit(2)

# Set global ARGS to be used by modules
inc.ARGS = args

# Get the pjsua executable name
if G_EXE == "":
    if sys.platform.find("win32")!=-1:
        EXE_DIR = "../../pjsip-apps/bin/"
        EXECUTABLES = [ "pjsua_vc6d.exe",
                "pjsua_vc6.exe",
                "pjsua-i386-Win32-vc8-Debug.exe",
                "pjsua-i386-Win32-vc8-Debug-Dynamic.exe",
                "pjsua-i386-Win32-vc8-Debug-Static.exe",
                "pjsua-i386-Win32-vc8-Release.exe",
                "pjsua-i386-Win32-vc8-Release-Dynamic.exe",
                "pjsua-i386-Win32-vc8-Release-Static.exe",
                "pjsua-i386-Win32-vc14-Debug.exe",
                "pjsua-i386-Win32-vc14-Debug-Dynamic.exe",
                "pjsua-i386-Win32-vc14-Debug-Static.exe",
                "pjsua-i386-Win32-vc14-Release.exe",
                "pjsua-i386-Win32-vc14-Release-Dynamic.exe",
                "pjsua-i386-Win32-vc14-Release-Static.exe"                
                ]
        e_ts = 0
        for e in EXECUTABLES:
            e = EXE_DIR + e
            if os.access(e, os.F_OK):
                st = os.stat(e)
                if e_ts==0 or e_ts<st.st_mtime:
                    G_EXE = e
                    e_ts = st.st_mtime

        if G_EXE=="":
            print("Unable to find valid pjsua. Please build pjsip first")
            sys.exit(1)

        G_INUNIX = False
    else:
        f = open("../../build.mak", "r")
        while True:
            line = f.readline()
            if not line:
                break
            if line.find("TARGET_NAME")!=-1:
                print(line)
                G_EXE="../../pjsip-apps/bin/pjsua-" + line.split(":= ")[1]
                break
        if G_EXE=="":
            print("Unable to find ../../../build.mak. Please build pjsip first")
            sys.exit(1)
        G_INUNIX = True
else:
    if sys.platform.lower().find("win32")!=-1 or sys.platform.lower().find("microsoft")!=-1:
        G_INUNIX = False
    else:
        G_INUNIX = True


G_EXE = G_EXE.rstrip("\n\r \t")

###################################
# Poor man's 'expect'-like class
class Expect(threading.Thread):
    proc = None
    telnet = None
    use_telnet = False
    echo = False
    trace_enabled = False
    inst_param = None
    rh = re.compile(const.DESTROYED)
    ra = re.compile(const.ASSERT, re.I)
    rr = re.compile(const.STDOUT_REFRESH)
    t0 = time.time()
    output = ""
    lock = threading.Lock()
    running = False
    def __init__(self, inst_param):
        threading.Thread.__init__(self)
        self.inst_param = inst_param
        self.name = inst_param.name
        self.echo = inst_param.echo_enabled
        self.trace_enabled = inst_param.trace_enabled
        self.use_telnet = inst_param.telnet_enabled
        self.telnet = None
        
    def run(self):
        if self.use_telnet:
            fullcmd = G_EXE + " " + self.inst_param.arg + " --use-cli --no-cli-console --cli-telnet-port=%d" % (self.inst_param.telnet_port)
            self.trace("Popen " + fullcmd)
            self.proc = subprocess.Popen(fullcmd, shell=G_INUNIX)
            
            # start telnet-ing to pjsua, raise exception if telnet fails after 5s
            t0 = time.time()
            while self.proc.poll() is None and self.telnet is None:
                try:
                    time.sleep(0.01)
                    self.telnet = telnetlib.Telnet('127.0.0.1', port=self.inst_param.telnet_port, timeout=60)
                except Exception as e:
                    t1 = time.time()
                    dur = int(t1 - t0)
                    if dur > 5:
                        raise inc.TestError(self.name + ": Timeout connecting to pjsua: " + repr(e))

            self.running = True
            while self.proc.poll() is None:
                line = self.telnet.read_until(b'\n', 60)
                linestr = line.decode('utf-8')
                if linestr == "" or const.DESTROYED in linestr:
                    break;
                    
                #Print the line if echo is ON
                if self.echo:
                    try:
                        print(self.name + ": " + linestr.rstrip())
                    except UnicodeEncodeError:
                        print((self.name + ": " + linestr.rstrip()).encode('utf-8'))

                self.lock.acquire()
                self.output += linestr
                self.lock.release()
            self.running = False
        else:
            fullcmd = G_EXE + " " + self.inst_param.arg + " --stdout-refresh=5 --stdout-refresh-text=" + const.STDOUT_REFRESH
            if not self.inst_param.enable_buffer:
                fullcmd = fullcmd + " --stdout-no-buf"
            self.trace("Popen " + fullcmd)
            self.proc = subprocess.Popen(fullcmd, shell=G_INUNIX, bufsize=0, stdin=subprocess.PIPE, stdout=subprocess.PIPE, universal_newlines=False)
            self.running = True
            while self.proc.poll() is None:
                line = self.proc.stdout.readline()
                if line == "":
                    break;
                    
                #Print the line if echo is ON
                if self.echo:
                    print(self.name + ": " + line.rstrip())

                self.lock.acquire()
                self.output += line
                self.lock.release()
            self.running = False

    def send(self, cmd):
        self.trace("send " + cmd)
        if self.use_telnet:
            self.telnet.write((cmd + '\r\n').encode('utf-8'))
        else:
            self.proc.stdin.writelines(cmd + "\n")
            self.proc.stdin.flush()
        
    def expect(self, pattern, raise_on_error=True, title="", timeout=15):
        # no prompt for telnet
        if self.use_telnet and pattern==const.PROMPT:
            return

        self.trace("expect " + pattern)
        r = re.compile(pattern, re.I)
        found_at = -1
        t0 = time.time()
        while found_at < 0:
            self.lock.acquire()
            lines = self.output.splitlines()
            
            for i, line in enumerate(lines):
                # Search for expected text
                if r.search(line) != None:
                    found_at = i
                    break
                
                # Trap assertion error
                if raise_on_error:
                    if self.ra.search(line) != None:
                        self.lock.release()
                        raise inc.TestError(self.name + ": " + line)

            self.output = '\n'.join(lines[found_at+1:])+"\n" if found_at >= 0 else ""
            self.lock.release()
            
            if found_at >= 0:
                return line

            if not self.running:
                if raise_on_error:
                    raise inc.TestError(self.name + ": Premature EOF")
                break
            else:
                t1 = time.time()
                dur = int(t1 - t0)
                if dur > timeout:
                    self.trace("Timed-out!")
                    if raise_on_error:
                        raise inc.TestError(self.name + " " + title + ": Timeout expecting pattern: \"" + pattern + "\"")
                    break
                else:
                    time.sleep(0.01)
        return None
                            
    def get_config(self, key_config):
        self.send("dd")
        line = self.expect(key_config);
        return line

    def sync_stdout(self):
        if not self.use_telnet:
            self.trace("sync_stdout")
            cmd = "echo 1" + str(random.randint(1000,9999))
            self.send(cmd)
            self.expect(cmd)

    def wait(self):
        self.trace("wait")
        self.join()
        self.proc.communicate()
        if self.telnet:
            self.telnet.close()

    def trace(self, s):
        if self.trace_enabled:
            now = time.time()
            fmt = self.name + ": " + "================== " + s + " ==================" + " [at t=%(time)03d]"
            try:
                print(fmt % {'time':int(now - self.t0)})
            except UnicodeEncodeError:
                print((fmt % {'time':int(now - self.t0)}).encode('utf-8'))

#########################
# Error handling
def handle_error(errmsg, t, close_processes = True):
    print("====== Caught error: " + errmsg + " ======")
    if (close_processes):
        time.sleep(1)
        for p in t.process:
            # Protect against 'Broken pipe' exception
            try:
                if not p.use_telnet:
                    p.send("q")
                    p.send("q")
                else:
                    p.send("shutdown")
            except:
                pass
            is_err = False
            try:
                ret = p.expect(const.DESTROYED, False)
                if ret is None:
                    is_err = True
            except:
                is_err = True
            if is_err and p.proc.poll() is None:
                if sys.hexversion >= 0x02060000:
                    p.proc.terminate()
                else:
                    p.wait()
            else:
                p.wait()

    print("Test completed with error: " + errmsg)
    sys.exit(1)


#########################
# MAIN    

# Import the test script
script = util.load_module_from_file("script", inc.ARGS[0])

# Init random seed
random.seed()

# Validate
if script.test == None:
    print("Error: no test defined")
    sys.exit(1)

if script.test.skip:
    print("Test " + script.test.title + " is skipped")
    sys.exit(0)

if len(script.test.inst_params) == 0:
    print("Error: test doesn't contain pjsua run descriptions")
    sys.exit(1)

# Instantiate pjsuas
print("====== Running " + script.test.title + " ======")
print("Using " + G_EXE + " as pjsua executable")

for inst_param in script.test.inst_params:
    retry = 0
    process_running = False
    while (not process_running) and retry < 3:
        p = None
        retry += 1
        try:
            # Create pjsua's Expect instance from the param
            p = Expect(inst_param)
            p.start()
        except inc.TestError as e:
            handle_error(e.desc, script.test)

        # wait process ready
        if not p.use_telnet:
            while True:
                try:
                    p.send("echo 1")
                except:
                    time.sleep(0.1)
                    continue
                break
            process_running = True
        else:
            t0 = time.time()
            while p.telnet is None:
                time.sleep(0.1)
                dur = int(time.time() - t0)
                if dur > 5:
                    break
            process_running = p.telnet is not None

        # wait before retrying
        if not process_running and retry < 2:
            time.sleep(2)

    if not process_running:
        handle_error("Failed running pjsua", script.test)

    # add running instance
    script.test.process.append(p)

for p in script.test.process:
    try:
        # Wait until registration completes
        if p.inst_param.have_reg:
            p.send("rr")
            p.expect(p.inst_param.uri+".*registration success")
         # Synchronize stdout
        if not p.use_telnet:
            p.send("")
            p.expect(const.PROMPT)
            p.send("echo 1")
            p.expect("echo 1")

    except inc.TestError as e:
        handle_error(e.desc, script.test)

# Run the test function
if script.test.test_func != None:
    try:
        script.test.test_func(script.test)
    except inc.TestError as e:
        handle_error(e.desc, script.test)
    except:
        handle_error("Unknown error: " + str(traceback.format_exc()), script.test)

# Shutdown all instances
for p in script.test.process:
    # Unregister if we have_reg to make sure that next tests
    # won't fail
    if p.inst_param.have_reg:
        p.send("ru")
        p.expect(p.inst_param.uri+".*unregistration success")
    
    if p.use_telnet:
        p.send("shutdown")
    else:
        p.send("q")

time.sleep(0.5)
for p in script.test.process:
    if p.running:
        p.expect(const.DESTROYED, False)
    p.wait()

# Run the post test function
if script.test.post_func != None:
    try:
        script.test.post_func(script.test)
    except inc.TestError as e:
        handle_error(e.desc, script.test, False)

# Done
print("Test " + script.test.title + " completed successfully")
sys.exit(0)

