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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include <cx/hash_map.h>

#include "threadpools.h"


static CxMap *thread_pool_map;
static int num_thrpools;
static CxMap *io_pool_map;
static int num_iopools;

static threadpool_t *default_thread_pool;
static threadpool_t *last_thrpool_c;

static threadpool_t *default_io_pool;
static threadpool_t *last_io_pool;

int create_threadpool(cxstring name, ThreadPoolConfig *cfg) { 
    if(thread_pool_map == NULL) {
        thread_pool_map = cxHashMapCreate(cxDefaultAllocator, CX_STORE_POINTERS, 16);
    }
    
    CxHashKey key = cx_hash_key_bytes((const unsigned char*)name.ptr, name.length);
    threadpool_t *pool = cxMapGet(thread_pool_map, key);
    if(pool) {
        if(pool->min_threads > cfg->max_threads) {
            pool->min_threads = cfg->min_threads;
            pool->max_threads = cfg->max_threads;
        } else {
            pool->max_threads = cfg->max_threads;
            pool->min_threads = cfg->min_threads;
        }
        return 0;
    } else {
        threadpool_t *tp = threadpool_new(cfg->min_threads, cfg->max_threads);
        
        int ret = 0;
        if(!threadpool_start(tp)) {
            ret = cxMapPut(thread_pool_map, key, tp);
        } else {
            ret = 1;
        }
        
        if(ret == 0) {
            num_thrpools++;
            last_thrpool_c = tp;
            if(!default_thread_pool) {
                default_thread_pool = tp;
            }
        }
        
        return ret;
    }
}

int create_io_pool(cxstring name, int numthreads) {
    if(io_pool_map == NULL) {
        io_pool_map = cxHashMapCreate(cxDefaultAllocator, CX_STORE_POINTERS, 4);
    }
    CxHashKey key = cx_hash_key_bytes((const unsigned char*)name.ptr, name.length);
    threadpool_t *pool = cxMapGet(io_pool_map, key);
    if(pool) {
        pool->min_threads = numthreads;
        pool->max_threads = numthreads;
        return 0;
    } else {
        threadpool_t *tp = threadpool_new(numthreads, numthreads);
        
        int ret = cxMapPut(io_pool_map, key, tp);
        
        if(ret == 0) {
            num_iopools++;
            last_io_pool = tp;
            if(!default_io_pool) {
                default_io_pool = tp;
            }
        }
        
        return ret;
    }
}

int check_thread_pool_cfg() {
    if(num_thrpools == 0) {
        ThreadPoolConfig cfg;
        cfg.min_threads = 4;
        cfg.max_threads = 8;
        cfg.queue_size = 64;
        cfg.stack_size = 262144;
        if(create_threadpool(cx_str("default"), &cfg)) {
            return 1;
        }
    }
    
    if(num_iopools == 0) {
        if(create_io_pool(cx_str("default"), 8)) {
            return 1;
        }
    }
    
    return 0;
}

threadpool_t* get_default_threadpool() {
    return default_thread_pool;
}

threadpool_t* get_threadpool(cxstring name) {
    return cxMapGet(thread_pool_map, cx_hash_key_bytes((const unsigned char*)name.ptr, name.length));
}

threadpool_t* get_default_iopool() {
    return default_io_pool;
}

threadpool_t* get_iopool(cxstring name) {
    return cxMapGet(io_pool_map, cx_hash_key_bytes((const unsigned char*)name.ptr, name.length));
}


void shutdown_threadpools(void) {
    log_ereport(LOG_INFORM, "shutdown threadpools");
    CxIterator i = cxMapIteratorValues(thread_pool_map);
    cx_foreach(threadpool_t*, tp, i) {
        threadpool_shutdown(tp);
    }
    i = cxMapIteratorValues(io_pool_map);
    cx_foreach(threadpool_t*, tp, i) {
        threadpool_shutdown(tp);
    }
}