#ifndef __HASHTABLE__
#define __HASHTABLE__
#include "khash.h"
#include "kmer.h"

KHASH_MAP_INIT_INT64(COUNT64, int) 
typedef khash_t(COUNT64) Count_Table;

KHASH_MAP_INIT_INT64(POS64, uint64_t) 
typedef khash_t(POS64) Pos_Table;

#define PREFIX_BITS 16
#define MAX_SUFFIX_BITS 64
#define MODE_VALUE 101


typedef struct
{
    volatile int lock;

}Hash_table_spin_lock;

typedef struct
{
	Count_Table** sub_h;
    Hash_table_spin_lock* sub_h_lock;
    int prefix_bits;
    int suffix_bits;
	int size;
    uint64_t suffix_mode;
    uint64_t non_unique_k_mer;
} Total_Count_Table;

typedef struct
{
    uint64_t offset;
    uint64_t readID;
} k_mer_pos;

typedef struct
{
    k_mer_pos* list;
    uint64_t length;
    uint64_t size;
    uint8_t direction;
    uint64_t end_pos;
} k_mer_pos_list;

typedef struct
{
    k_mer_pos_list* list;
    uint64_t size;
    uint64_t length;
} k_mer_pos_list_alloc;

typedef struct
{
    uint64_t x_id;
    uint64_t x_pos_s;
    uint64_t x_pos_e;
    uint64_t x_pos_strand;

    uint64_t y_id;
    uint64_t y_pos_s;
    uint64_t y_pos_e;
    uint64_t y_pos_strand;

    uint64_t shared_seed;
    uint64_t align_length;
} overlap_region;


typedef struct
{
    overlap_region* list;
    uint64_t size;
    uint64_t length;
} overlap_region_alloc;

typedef struct
{
    ///uint64_t offset;
    long long offset;
    ///uint64_t self_offset;
    long long self_offset;
    uint64_t readID;
    uint8_t strand;
} k_mer_hit;


typedef struct
{
  k_mer_hit node;
  uint64_t ID;
} ElemType;


typedef struct 
{
    ElemType* heap; 
    uint64_t* index_i;
    int len; 
    int MaxSize;    
} HeapSq;



typedef struct
{
    k_mer_hit* list;
    k_mer_hit* tmp;
    long long length;
    long long size;
    uint64_t foward_pos;
    uint64_t rc_pos;
} Candidates_list;

typedef struct
{
	Pos_Table** sub_h;
    Hash_table_spin_lock* sub_h_lock;
    int prefix_bits;
    int suffix_bits;
	int size;
    uint64_t suffix_mode;
    k_mer_pos* pos;
    uint64_t useful_k_mer;
    uint64_t total_occ;
    uint64_t* k_mer_index;
} Total_Pos_Table;


/********************************for debug***************************************/
inline void print_64bit(uint64_t x)
{
    int i;
    for(i = 63; i >= 0; i--)
	{
		if(x & ((1ULL<<i)))
			fprintf(stderr, "1");
		else
			fprintf(stderr, "0");
	}

    fprintf(stderr, "\n");
}

inline uint64_t mod_d(uint64_t h_key, uint64_t low_key, uint64_t d)
{
    uint64_t result = (h_key >> 32) % d;
    result = ((result << 32) + (h_key & (uint64_t)0xffffffff)) % d;
    result = ((result << 32) + (low_key >> 32)) % d;
    result = ((result << 32) + (low_key & (uint64_t)0xffffffff)) % d;

    return result;
}



///inline int get_sub_table(uint64_t* get_sub_ID, uint64_t* get_sub_key, Total_Count_Table* TCB, Hash_code* code, int k)
inline int get_sub_table(uint64_t* get_sub_ID, uint64_t* get_sub_key, uint64_t suffix_mode, int suffix_bits,
Hash_code* code, int k)
{
    uint64_t h_key, low_key;
    ///k有可能是64，所以可能会有问题
    ///low_key = code->x[0] | (code->x[1] << k);
    low_key = code->x[0] | (code->x[1] << SAFE_SHIFT(k));
    //k不可能为0, 所以这个右移不会有问题
    h_key = code->x[1] >> (64 - k);

    if(mod_d(h_key, low_key, MODE_VALUE) > 3)
    {
        return 0;
    }


    ///注意suffix_bits最大就是64
    ///前一个右移不安全，因为TCB->suffix_bits有可能为64
    ///后一个左移安全，因为TCB->suffix_bits不可能为0
    //uint64_t sub_ID = (low_key >> TCB->suffix_bits) | (h_key << (64 - TCB->suffix_bits));
    uint64_t sub_ID = (low_key >> SAFE_SHIFT(suffix_bits)) | (h_key << (64 - suffix_bits));
    uint64_t sub_key = (low_key & suffix_mode);

    *get_sub_ID = sub_ID;
    *get_sub_key = sub_key;

     return 1;

}


inline int insert_Total_Count_Table(Total_Count_Table* TCB, Hash_code* code, int k)
{
    uint64_t sub_ID, sub_key;
    if(!get_sub_table(&sub_ID, &sub_key, TCB->suffix_mode, TCB->suffix_bits, code, k))
    {
        return 0;
    }

    khint_t t;  ///这就是个迭代器
    int absent;


    while (__sync_lock_test_and_set(&TCB->sub_h_lock[sub_ID].lock, 1))
    {
        while (TCB->sub_h_lock[sub_ID].lock);
    }

    t = kh_put(COUNT64, TCB->sub_h[sub_ID], sub_key, &absent);
    if (absent)
    {
        kh_value(TCB->sub_h[sub_ID], t) = 1;
    }
    else   ///哈希表中已有的元素
    {
        //kh_value(TCB->sub_h[sub_ID], t) = kh_value(TCB->sub_h[sub_ID], t) + 1;
        kh_value(TCB->sub_h[sub_ID], t)++;
    }

    __sync_lock_release(&TCB->sub_h_lock[sub_ID].lock);

    return 1;
}

inline int get_Total_Count_Table(Total_Count_Table* TCB, Hash_code* code, int k)
{

    uint64_t sub_ID, sub_key;
    if(!get_sub_table(&sub_ID, &sub_key, TCB->suffix_mode, TCB->suffix_bits, code, k))
    {
        return 0;
    }

    khint_t t;  ///这就是个迭代器
    int absent;

    ///查询哈希表，key为k
    t = kh_get(COUNT64, TCB->sub_h[sub_ID], sub_key);

    if (t != kh_end(TCB->sub_h[sub_ID]))
    {
        return kh_value(TCB->sub_h[sub_ID], t);
    }
    else
    {
        return 0;
    }


}



inline uint64_t get_Total_Pos_Table(Total_Pos_Table* PCB, Hash_code* code, int k, uint64_t* r_sub_ID)
{

    uint64_t sub_ID, sub_key;
    if(!get_sub_table(&sub_ID, &sub_key, PCB->suffix_mode, PCB->suffix_bits, code, k))
    {
        return (uint64_t)-1;
    }

    khint_t t;  ///这就是个迭代器
    int absent;

    ///查询哈希表，key为k
    t = kh_get(POS64, PCB->sub_h[sub_ID], sub_key);

    if (t != kh_end(PCB->sub_h[sub_ID]))
    {
        *r_sub_ID = sub_ID;
        return kh_value(PCB->sub_h[sub_ID], t);
    }
    else
    {
        return (uint64_t)-1;
    }


}

inline uint64_t count_Total_Pos_Table(Total_Pos_Table* PCB, Hash_code* code, int k)
{
    uint64_t sub_ID;
    uint64_t ret = get_Total_Pos_Table(PCB, code, k, &sub_ID);
    if(ret != (uint64_t)-1)
    {
        return PCB->k_mer_index[ret + 1] - PCB->k_mer_index[ret];
    }
    else
    {
        return 0;
    }
}


inline uint64_t locate_Total_Pos_Table(Total_Pos_Table* PCB, Hash_code* code, k_mer_pos** list, int k, uint64_t* r_sub_ID)
{
    uint64_t ret = get_Total_Pos_Table(PCB, code, k, r_sub_ID);
    if(ret != (uint64_t)-1)
    {
        *list = PCB->k_mer_index[ret] + PCB->pos;
        return PCB->k_mer_index[ret + 1] - PCB->k_mer_index[ret];
    }
    else
    {
        *list = NULL;
        return 0;
    }
}

int cmp_k_mer_pos(const void * a, const void * b);


//inline uint64_t insert_Total_Pos_Table(Total_Pos_Table* PCB, Hash_code* code, int k, uint64_t readID, uint64_t pos, uint64_t direction)
inline uint64_t insert_Total_Pos_Table(Total_Pos_Table* PCB, Hash_code* code, int k, uint64_t readID, uint64_t pos)
{
    k_mer_pos* list;
    int flag = 0;
    uint64_t sub_ID;
    uint64_t occ = locate_Total_Pos_Table(PCB, code, &list, k, &sub_ID);

    if (occ)
    {   

        while (__sync_lock_test_and_set(&PCB->sub_h_lock[sub_ID].lock, 1))
        {
            while (PCB->sub_h_lock[sub_ID].lock);
        }

        if (list[0].offset + 1 < occ)
        {
            list[0].offset++;
            list[list[0].offset].readID = readID;
            ///list[list[0].offset].readID = readID|direction;
            list[list[0].offset].offset = pos;
        }
        else
        {
            list[0].readID = readID;
            ///list[0].readID = readID|direction;
            list[0].offset = pos;
            flag = 1;
        }

        __sync_lock_release(&PCB->sub_h_lock[sub_ID].lock);

        ///当所有位置都存好后，不会再有其他线程修改该list
        ///所以可以在临界区外排序
        if (flag && occ>1)
        {
            qsort(list, occ, sizeof(k_mer_pos), cmp_k_mer_pos);
        }

        
        return 1;
    }
    else
    {
        return 0;
    }
    
    
}


void init_Total_Count_Table(int k, Total_Count_Table* TCB);
void init_Total_Pos_Table(Total_Pos_Table* TCB, Total_Count_Table* pre_TCB);
void destory_Total_Count_Table(Total_Count_Table* TCB);

void init_Count_Table(Count_Table** table);
void init_Pos_Table(Count_Table** pre_table, Pos_Table** table);
void destory_Total_Pos_Table(Total_Pos_Table* TCB);
void write_Total_Pos_Table(Total_Pos_Table* TCB, char* read_file_name);
int load_Total_Pos_Table(Total_Pos_Table* TCB, char* read_file_name);



void Traverse_Counting_Table(Total_Count_Table* TCB, Total_Pos_Table* PCB, int k_mer_min_freq, int k_mer_max_freq);

void init_Candidates_list(Candidates_list* l);
void clear_Candidates_list(Candidates_list* l);
void destory_Candidates_list(Candidates_list* l);
void merge_Candidates_list(Candidates_list* l, k_mer_pos* n_list, uint64_t n_lengh, uint64_t end_pos, int strand);


void init_k_mer_pos_list_alloc(k_mer_pos_list_alloc* list);
void destory_k_mer_pos_list_alloc(k_mer_pos_list_alloc* list);
void clear_k_mer_pos_list_alloc(k_mer_pos_list_alloc* list);
void append_k_mer_pos_list_alloc(k_mer_pos_list_alloc* list, k_mer_pos* n_list, uint64_t n_length, 
uint64_t n_end_pos, uint8_t n_direction);



void merge_k_mer_pos_list_alloc(k_mer_pos_list_alloc* list, Candidates_list* candidates);
void merge_k_mer_pos_list_alloc_heap_sort(k_mer_pos_list_alloc* list, Candidates_list* candidates, HeapSq* HBT);
void merge_k_mer_pos_list_alloc_heap_sort_advance(k_mer_pos_list_alloc* list, Candidates_list* candidates, HeapSq* HBT);

void Init_Heap(HeapSq* HBT);
void destory_Heap(HeapSq* HBT);
void clear_Heap(HeapSq* HBT);

void init_overlap_region_alloc(overlap_region_alloc* list);
void clear_overlap_region_alloc(overlap_region_alloc* list);
void destory_overlap_region_alloc(overlap_region_alloc* list);
void append_overlap_region_alloc(overlap_region_alloc* list, overlap_region* tmp, All_reads* R_INF);
void calculate_overlap_region(Candidates_list* candidates, overlap_region_alloc* overlap_list, 
uint64_t readID, uint64_t readLength, All_reads* R_INF);

















































/********************************for debug***************************************/
inline int verify_Total_Count_Table(Total_Count_Table* TCB, Hash_code* code, int k)
{
    uint64_t sub_ID, sub_key;
    if(!get_sub_table(&sub_ID, &sub_key, TCB->suffix_mode, TCB->suffix_bits, code, k))
    {
        return 0;
    }

    khint_t t;  ///这就是个迭代器
    int absent;

    ///查询哈希表，key为k
    t = kh_get(COUNT64, TCB->sub_h[sub_ID], sub_key);

    if (t != kh_end(TCB->sub_h[sub_ID]))
    {
        kh_value(TCB->sub_h[sub_ID], t)--;
        if (kh_value(TCB->sub_h[sub_ID], t)<0)
        {
           return -1;
        }
        else
        {
            return 1;
        }
    }
    else
    {
        return -1;
    }
}






/********************************for debug***************************************/
inline int Traverse_Total_Count_Table(Total_Count_Table* TCB)
{
    int i;
    Count_Table* h;
    khint_t k;

    long long non_empty_k_mer = 0;

    for (i = 0; i < TCB->size; i++)
    {
        h = TCB->sub_h[i];
        for (k = kh_begin(h); k != kh_end(h); ++k)
        {
            if (kh_exist(h, k))            // test if a bucket contains data
            {
                non_empty_k_mer++;

                if (kh_value(h, k)!= 0)
                {
                    fprintf(stderr, "ERROR when Traversing!\n");
                }
            }
        }
    }
    
    fprintf(stdout, "non_empty_k_mer: %lld\n", non_empty_k_mer);
}


/********************************for debug***************************************/
void test_COUNT64();

/********************************for debug***************************************/
void debug_mode(uint64_t d, uint64_t thread_ID, uint64_t thread_num);



/********************************for debug***************************************/
void merge_Candidates_list_version(Candidates_list* l, k_mer_pos* n_list, uint64_t n_lengh, uint64_t end_pos, int strand);

#endif