#ifndef THREAD_POOL_H
#define THREAD_POOL_H

#include <stddef.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    THREAD_POOL_JOB_REQ_QUERY = 0,
    THREAD_POOL_JOB_COUNT_QUERY,
    THREAD_POOL_JOB_STORE_EVENT,
    THREAD_POOL_JOB_DELETE_EVENT,
    THREAD_POOL_JOB_LOG_SUB_CREATED,
    THREAD_POOL_JOB_LOG_SUB_CLOSED,
    THREAD_POOL_JOB_LOG_SUB_DISCONNECTED,
    THREAD_POOL_JOB_UPDATE_SUB_EVENTS_SENT,
    THREAD_POOL_JOB_IP_BAN_SAVE,
    THREAD_POOL_JOB_WAL_CHECKPOINT,
    THREAD_POOL_JOB_CUSTOM
} thread_pool_job_type_t;

typedef enum {
    THREAD_POOL_STATUS_OK = 0,
    THREAD_POOL_STATUS_NOT_IMPLEMENTED,
    THREAD_POOL_STATUS_QUEUE_FULL,
    THREAD_POOL_STATUS_SHUTTING_DOWN,
    THREAD_POOL_STATUS_INTERNAL_ERROR
} thread_pool_status_t;

typedef struct {
    uint64_t job_id;
    thread_pool_job_type_t type;
    thread_pool_status_t status;
    void* session;
    void* result_data;
    size_t result_size;
    const char* message;
} thread_pool_result_t;

typedef void (*thread_pool_result_cb)(const thread_pool_result_t* result, void* user_ctx);
typedef void (*thread_pool_payload_free_cb)(void* payload);
typedef void (*thread_pool_wake_loop_cb)(void* wake_ctx);

typedef struct {
    thread_pool_job_type_t type;
    void* session;
    void* payload;
    size_t payload_size;
    thread_pool_payload_free_cb payload_free;
    thread_pool_result_cb result_cb;
    void* result_cb_ctx;
} thread_pool_job_t;

typedef struct {
    int reader_threads;
    int max_queue_depth;
    const char* db_path;
    thread_pool_wake_loop_cb wake_loop_cb;
    void* wake_loop_ctx;
} thread_pool_config_t;

typedef struct {
    char* sql;
    char** bind_params;
    int bind_param_count;
} thread_pool_count_payload_t;

typedef struct {
    char* sql;
    char** bind_params;
    int bind_param_count;
    int row_limit;
} thread_pool_req_payload_t;

typedef struct {
    char* id;
    char* pubkey;
    long long created_at;
    int kind;
    char* event_type;
    char* content;
    char* sig;
    char* tags_json;
    char* event_json;
} thread_pool_store_event_payload_t;

typedef struct {
    int count;
} thread_pool_count_result_t;

typedef struct {
    char** event_json_rows;
    int row_count;
} thread_pool_req_result_t;

typedef struct {
    int step_rc;
    int extended_errcode;
} thread_pool_store_event_result_t;

typedef struct {
    char* sub_id;
    char* wsi_ptr;
    char* client_ip;
    char* filter_json;
} thread_pool_sub_log_created_payload_t;

typedef struct {
    char* sub_id;
    char* client_ip;
} thread_pool_sub_log_closed_payload_t;

typedef struct {
    char* client_ip;
} thread_pool_sub_log_disconnected_payload_t;

typedef struct {
    char* sub_id;
    int events_sent;
} thread_pool_sub_update_events_payload_t;

int thread_pool_init(const thread_pool_config_t* config);
void thread_pool_shutdown(void);
int thread_pool_is_running(void);

thread_pool_status_t thread_pool_submit_read(const thread_pool_job_t* job, uint64_t* out_job_id);
thread_pool_status_t thread_pool_submit_write(const thread_pool_job_t* job, uint64_t* out_job_id);

int thread_pool_submit_wal_checkpoint(void);

int thread_pool_execute_count_sync(const char* sql, const char** bind_params, int bind_param_count, int* out_count);
int thread_pool_execute_req_sync(const char* sql, const char** bind_params, int bind_param_count,
                                 int row_limit, thread_pool_req_result_t** out_result);
void thread_pool_free_req_result(thread_pool_req_result_t* result);
int thread_pool_execute_store_event_sync(const thread_pool_store_event_payload_t* payload,
                                         thread_pool_store_event_result_t* out_result);

#ifdef __cplusplus
}
#endif

#endif // THREAD_POOL_H