#include "h.h"

#define DEFAULT_WORKER_PROCESSES    4
#define MAXNUM_WORKER_PROCESSES     1024
static proc_ctx_t s_worker_processes[MAXNUM_WORKER_PROCESSES];

typedef struct conf_ctx_s {
    IniParser* parser;
    int loglevel;
    int worker_processes;
    int port;
} conf_ctx_t;
conf_ctx_t g_conf_ctx;

inline void conf_ctx_init(conf_ctx_t* ctx) {
    ctx->parser = new IniParser;
    ctx->loglevel = LOG_LEVEL_DEBUG;
    ctx->worker_processes = 0;
    ctx->port = 0;
}

static void print_version();
static void print_help();

static int  parse_cmdline(int argc, char** argv);
static int  parse_confile(const char* confile);

static int  signal_init();
static void signal_cleanup();
static void handle_signal();

static void master_proc(void* userdata);
static void worker_proc(void* userdata);

// unix short style
static char options[] = "hvc:ts:dp:";
static char detail_options[] = "\
-h              : print help\n\
-v              : print version\n\
-c  confile     : set configure file, default etc/${program}.conf\n\
-t              : test configure file and exit\n\
-s  signal      : send signal to process\n\
                  signal=[start, stop, restart, status]\n\
-d              : daemon\n\
-p  port        : set listen port\n\
";

void print_version() {
    printf("%s version %s\n", g_main_ctx.program_name, get_compile_version());
}

void print_help() {
    printf("Usage: %s [%s]\n", g_main_ctx.program_name, options);
    printf("Options:\n%s\n", detail_options);
}

#define INVALID_OPTION  -1
#define FLAG_OPTION     1
#define PARMA_OPTION    2
int get_option(char opt) {
    char* p = options;
    while (*p && *p != opt) ++p;
    if (*p == '\0')     return INVALID_OPTION;
    if (*(p+1) == ':')  return PARMA_OPTION;
    return FLAG_OPTION;
}

int parse_cmdline(int argc, char** argv) {
    int i = 1;
    while (argv[i]) {
        char* p = argv[i];
        if (*p != '-') {
            printf("Invalid argv[%d]: %s\n", i, argv[i]);
            exit(-10);
        }
        while (*++p) {
            switch (get_option(*p)) {
            case INVALID_OPTION:
                printf("Invalid option: '%c'\n", *p);
                exit(-20);
            case FLAG_OPTION:
                g_main_ctx.arg_kv[std::string(p, 1)] = "true";
                break;
            case PARMA_OPTION:
                if (*(p+1) != '\0') {
                    g_main_ctx.arg_kv[std::string(p, 1)] = p+1;
                    ++i;
                    goto next_option;
                } else if (argv[i+1] != NULL) {
                    g_main_ctx.arg_kv[std::string(p, 1)] = argv[i+1];
                    i += 2;
                    goto next_option;
                } else {
                    printf("Option '%c' requires param\n", *p);
                    exit(-30);
                }
            }
        }
        ++i;
next_option:
        continue;
    }
    return 0;
}

int parse_confile(const char* confile) {
    conf_ctx_init(&g_conf_ctx);
    int ret = g_conf_ctx.parser->LoadFromFile(confile);
    if (ret != 0) {
        printf("Load confile [%s] failed: %d\n", confile, ret);
        exit(-40);
    }

    // loglevel
    const char* szLoglevel = g_conf_ctx.parser->GetValue("loglevel").c_str();
    if (stricmp(szLoglevel, "DEBUG") == 0) {
        g_conf_ctx.loglevel = LOG_LEVEL_DEBUG;
    } else if (stricmp(szLoglevel, "INFO") == 0) {
        g_conf_ctx.loglevel = LOG_LEVEL_INFO;
    } else if (stricmp(szLoglevel, "WARN") == 0) {
        g_conf_ctx.loglevel = LOG_LEVEL_WARN;
    } else if (stricmp(szLoglevel, "ERROR") == 0) {
        g_conf_ctx.loglevel = LOG_LEVEL_ERROR;
    } else {
        g_conf_ctx.loglevel = LOG_LEVEL_DEBUG;
    }
    hlog_set_level(g_conf_ctx.loglevel);

    // worker_processes
    int worker_processes = 0;
    worker_processes = atoi(g_conf_ctx.parser->GetValue("worker_processes").c_str());
    if (worker_processes <= 0 || worker_processes > MAXNUM_WORKER_PROCESSES) {
        worker_processes = get_ncpu();
        hlogd("worker_processes=ncpu=%d", worker_processes);
    }
    if (worker_processes <= 0 || worker_processes > MAXNUM_WORKER_PROCESSES) {
        worker_processes = DEFAULT_WORKER_PROCESSES;
    }
    g_conf_ctx.worker_processes = worker_processes;

    // port
    int port = 0;
    const char* szPort = get_arg("p");
    if (szPort) {
        port = atoi(szPort);
    }
    if (port == 0) {
        port = atoi(g_conf_ctx.parser->GetValue("port").c_str());
    }
    if (port == 0) {
        printf("Please config listen port!\n");
        exit(-10);
    }
    g_conf_ctx.port = port;

    return 0;
}

#ifdef __unix__
// unix use signal
// we use SIGTERM to quit process
#define SIGNAL_TERMINATE    SIGTERM
#include <sys/wait.h>

void signal_handler(int signo) {
    hlogi("pid=%d recv signo=%d", getpid(), signo);
    switch (signo) {
    case SIGINT:
    case SIGNAL_TERMINATE:
        hlogi("killall processes");
        signal(SIGCHLD, SIG_IGN);
        for (int i = 0; i < MAXNUM_WORKER_PROCESSES; ++i) {
            if (s_worker_processes[i].pid <= 0) break;
            kill(s_worker_processes[i].pid, SIGKILL);
            s_worker_processes[i].pid = -1;
        }
        exit(0);
        break;
    case SIGCHLD:
    {
        pid_t pid = 0;
        int status = 0;
        while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
            hlogw("proc stop/waiting, pid=%d status=%d", pid, status);
            for (int i = 0; i < MAXNUM_WORKER_PROCESSES; ++i) {
                if (s_worker_processes[i].pid == pid) {
                    s_worker_processes[i].pid = -1;
                    create_proc(&s_worker_processes[i]);
                    break;
                }
            }
        }
    }
        break;
    default:
        break;
    }
}

int signal_init() {
    signal(SIGINT, signal_handler);
    signal(SIGCHLD, signal_handler);
    signal(SIGNAL_TERMINATE, signal_handler);

    atexit(signal_cleanup);
    return 0;
}

void signal_cleanup() {
}
#elif defined(_WIN32)
// win32 use Event
static HANDLE s_hEventTerm = NULL;

#include <mmsystem.h>
#ifdef _MSC_VER
#pragma comment(lib, "winmm.lib")
#endif
void WINAPI on_timer(UINT uTimerID, UINT uMsg, DWORD_PTR dwUser, DWORD_PTR dw1, DWORD_PTR dw2) {
    DWORD ret = WaitForSingleObject(s_hEventTerm, 0);
    if (ret == WAIT_OBJECT_0) {
        timeKillEvent(uTimerID);
        hlogi("pid=%d recv event [TERM]", getpid());
        exit(0);
    }
}

int signal_init() {
    char eventname[MAX_PATH] = {0};
    snprintf(eventname, sizeof(eventname), "%s_term_event", g_main_ctx.program_name);
    s_hEventTerm = CreateEvent(NULL, FALSE, FALSE, eventname);
    //s_hEventTerm = OpenEvent(EVENT_ALL_ACCESS, FALSE, eventname);

    timeSetEvent(1000, 1000, on_timer, 0, TIME_PERIODIC);

    atexit(signal_cleanup);
    return 0;
}

void signal_cleanup() {
    CloseHandle(s_hEventTerm);
    s_hEventTerm = NULL;
}
#endif

void handle_signal() {
    const char* signal = get_arg("s");
    if (signal) {
        if (strcmp(signal, "start") == 0) {
            if (g_main_ctx.oldpid > 0) {
                printf("%s is already running, pid=%d\n", g_main_ctx.program_name, g_main_ctx.oldpid);
                exit(0);
            }
        } else if (strcmp(signal, "stop") == 0) {
            if (g_main_ctx.oldpid > 0) {
#ifdef __unix__
                kill(g_main_ctx.oldpid, SIGNAL_TERMINATE);
#else
                SetEvent(s_hEventTerm);
#endif
                printf("%s stop/waiting\n", g_main_ctx.program_name);
            } else {
                printf("%s is already stopped\n", g_main_ctx.program_name);
            }
            exit(0);
        } else if (strcmp(signal, "restart") == 0) {
            if (g_main_ctx.oldpid > 0) {
#ifdef __unix__
                kill(g_main_ctx.oldpid, SIGNAL_TERMINATE);
#else
                SetEvent(s_hEventTerm);
#endif
                printf("%s stop/waiting\n", g_main_ctx.program_name);
                msleep(1000);
            }
        } else if (strcmp(signal, "status") == 0) {
            if (g_main_ctx.oldpid > 0) {
                printf("%s start/running, pid=%d\n", g_main_ctx.program_name, g_main_ctx.oldpid);
            } else {
                printf("%s stop/waiting\n", g_main_ctx.program_name);
            }
            exit(0);
        } else {
            printf("Invalid signal: '%s'\n", signal);
            exit(0);
        }
        printf("%s start/running\n", g_main_ctx.program_name);
    }
}

int main(int argc, char** argv) {
    // g_main_ctx
    main_ctx_init(argc, argv);
    parse_cmdline(argc, argv);

    // help
    if (get_arg("h")) {
        print_help();
        exit(0);
    }

    // version
    if (get_arg("v")) {
        print_version();
        exit(0);
    }

    // logfile
    hlog_set_file(g_main_ctx.logfile);
    hlogi("%s version: %s", g_main_ctx.program_name, get_compile_version());

    // confile
    const char* confile = get_arg("c");
    if (confile) {
        strncpy(g_main_ctx.confile, confile, sizeof(g_main_ctx.confile));
    }

    // g_conf_ctx
    parse_confile(g_main_ctx.confile);

    // test
    if (get_arg("t")) {
        printf("Test confile [%s] OK!\n", g_main_ctx.confile);
        exit(0);
    }

    // signal
    signal_init();
    handle_signal();

#ifdef __unix__
    // daemon
    if (get_arg("d")) {
        // nochdir, noclose
        int ret = daemon(1, 1);
        if (ret != 0) {
            printf("daemon error: %d\n", ret);
            exit(-10);
        }
        // parent process exit after daemon, so pid changed.
        g_main_ctx.pid = getpid();
    }
    // proctitle
    char proctitle[256] = {0};
    snprintf(proctitle, sizeof(proctitle), "%s: master process", g_main_ctx.program_name);
    setproctitle(proctitle);
#endif

    // pidfile
    create_pidfile();
    hlogi("%s start/running, pid=%d", g_main_ctx.program_name, g_main_ctx.pid);

    // master-worker proc
    memset(s_worker_processes, 0, sizeof(s_worker_processes));
    for (int i = 0; i < g_conf_ctx.worker_processes; ++i) {
        proc_ctx_t* ctx = &s_worker_processes[i];
        snprintf(ctx->proctitle, sizeof(ctx->proctitle), "%s: worker process", g_main_ctx.program_name);
        ctx->proc = worker_proc;
        ctx->userdata = NULL;
        create_proc(ctx);
    }
    master_proc(NULL);

    return 0;
}

void master_proc(void* userdata) {
    while(1) msleep(1000);
}

void worker_proc(void* userdata) {
    while(1) msleep(1000);
}