#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>

#include <cache.h>
#include <cJSON.h>
#include <logger.h>
#include <database.h>
#include <models/controller.h>
#include <models/junction_tag.h>
#include <models/tag.h>

static int
db_update_insert(controller_t *controller, sqlite3_stmt *stmt)
{
    int rc;

    sqlite3_bind_int(stmt, 1, controller->id);
    sqlite3_bind_blob(stmt, 2, controller->uid, sizeof(uuid_t), SQLITE_STATIC);
    sqlite3_bind_text(stmt, 3, controller->name, -1, SQLITE_STATIC);
    sqlite3_bind_text(stmt, 4, controller->ip, -1, SQLITE_STATIC);
    sqlite3_bind_int(stmt, 5, controller->active);
    sqlite3_bind_int(stmt, 6, controller->port);
    sqlite3_bind_int(stmt, 7, controller->relay_count);

    rc = sqlite3_step(stmt);

    sqlite3_finalize(stmt);

    return rc != SQLITE_DONE;
}
static controller_t*
controller_db_select_mapper(sqlite3_stmt *stmt)
{
    controller_t *new_controller = malloc(sizeof(controller_t));
    for(int i = 0; i < sqlite3_column_count(stmt); i++)
    {
        const char *name = sqlite3_column_name(stmt, i);
        switch(name[0])
        {
            case 'a': // active
                new_controller->active = (bool)sqlite3_column_int(stmt, i);
                break;
            case 'i':
                switch(name[1])
                {
                    case 'd': // id
                        new_controller->id = sqlite3_column_int(stmt, i);
                        break;
                    case 'p': // ip
                        strncpy(new_controller->ip, (const char*)sqlite3_column_text(stmt, i), 16);
                        break;
                    default: // ignore columns not implemented
                        break;
                }
                break;
            case 'n': // name
                strncpy(new_controller->name, (const char*)sqlite3_column_text(stmt, i), 127);
                break;
            case 'p': // port
                new_controller->port = sqlite3_column_int(stmt, i);
                break;
            case 'r': // relay_count
                new_controller->relay_count = sqlite3_column_int(stmt, i);
                break;
            case 'u': // uid
                uuid_copy(new_controller->uid, (const unsigned char*)sqlite3_column_blob(stmt, i));
                break;
            default: // ignore columns not implemented
                break;
        }
    }
    new_controller->relays = relay_get_by_controller_id(new_controller->id);
    return new_controller;
}

static controller_t**
controller_db_select(sqlite3_stmt *stmt)
{
    controller_t **all_controllers = malloc(sizeof(controller_t*));

    int row = 0;

    while(true)
    {
        int s;

        s = sqlite3_step(stmt);
        if (s == SQLITE_ROW)
        {
            controller_t *new_controller = controller_db_select_mapper(stmt);
            row++;

            all_controllers = (controller_t**)realloc(all_controllers, sizeof(controller_t*) * (row + 1));
            all_controllers[row - 1] = new_controller;
        }
        else
        {
            if(s == SQLITE_DONE)
            {
                break;
            }
            else
            {
                LOGGER_ERR("error selecting controllers from database: %s\n", sqlite3_errstr(s));
                break;
            }
        }
    }
    sqlite3_finalize(stmt);
    all_controllers[row] = NULL;
    return all_controllers;
}

int
controller_save(controller_t *controller)
{
    sqlite3_stmt *stmt;
    if(controller->id)
    {
        sqlite3_prepare_v2(global_database, "UPDATE controllers set uid = ?2, name = ?3, ip = ?4, active = ?5, port = ?6, relay_count = ?7 WHERE id = ?1;", -1, &stmt, NULL);
    }
    else
    {
        sqlite3_prepare_v2(global_database, "INSERT INTO controllers(uid, name, ip, active, port, relay_count) values (?2, ?3, ?4, ?5, ?6, ?7);", -1, &stmt, NULL);
    }

    int result = db_update_insert(controller, stmt);

    if(result)
    {
        if(controller->id)
        {
            LOGGER_ERR("error inserting data: %s\n", sqlite3_errmsg(global_database));
        }
        else
        {
            LOGGER_ERR("error updating data: %s\n", sqlite3_errmsg(global_database));
        }
    }
    else
    {
        if(!controller->id)
        {
            controller->id = sqlite3_last_insert_rowid(global_database);
        }
    }

    cache_invalidate_controller(controller->id);

    return result;
}

int
controller_remove(controller_t *controller)
{
    sqlite3_stmt *stmt;
    if(!controller->id)
    {
        return 0;
    }

    sqlite3_prepare_v2(global_database, "DELETE FROM controllers WHERE id=?1;", -1, &stmt, NULL);
    sqlite3_bind_int(stmt, 1, controller->id);

    int rc = sqlite3_step(stmt);

    sqlite3_finalize(stmt);

    return rc != SQLITE_DONE;
}

void
controller_free(controller_t *controller)
{
    relay_free_list(controller->relays);
    free(controller);
}

void
controller_free_list(controller_t **controllers)
{
    for(int i = 0; controllers[i] != NULL; ++i)
    {
        controller_free(controllers[i]);
    }
    free(controllers);
}

char*
controller_to_json(controller_t *controller)
{
    char *cached = cache_get_json_controller(controller->id);
    if(cached)
    {
        return cached;
    }

    char uuid_str[UUID_STR_LEN];
    uuid_unparse(controller->uid, uuid_str);

    LOGGER_DEBUG("JSONifying controller %s\n", uuid_str);

    cJSON *json = cJSON_CreateObject();

    cJSON *json_name = cJSON_CreateString(controller->name);
    if(json_name == NULL)
    {
        cJSON_Delete(json);
        return NULL;
    }
    cJSON_AddItemToObject(json, "name", json_name);

    cJSON *json_id = cJSON_CreateString(uuid_str);
    if(json_name == NULL)
    {
        cJSON_Delete(json);
        return NULL;
    }
    cJSON_AddItemToObject(json, "id", json_id);

    cJSON *json_ip = cJSON_CreateString(controller->ip);
    if(json_ip == NULL)
    {
        cJSON_Delete(json);
        return NULL;
    }
    cJSON_AddItemToObject(json, "ip", json_ip);

    cJSON *json_port = cJSON_CreateNumber(controller->port);
    if(json_port == NULL)
    {
        cJSON_Delete(json);
        return NULL;
    }
    cJSON_AddItemToObject(json, "port", json_port);

    cJSON *json_relay_count = cJSON_CreateNumber(controller->relay_count);
    if(json_relay_count == NULL)
    {
        cJSON_Delete(json);
        return NULL;
    }
    cJSON_AddItemToObject(json, "relay_count", json_relay_count);

    cJSON *json_active = cJSON_CreateBool(controller->active);
    if(json_active == NULL)
    {
        cJSON_Delete(json);
        return NULL;
    }
    cJSON_AddItemToObject(json, "active", json_active);

    relay_t **relays = relay_get_by_controller_id(controller->id);
    cJSON *json_relays = cJSON_CreateArray();
    for(int i = 0; relays[i] != NULL; ++i)
    {
        cJSON *json_relay = cJSON_CreateRaw(relay_to_json(relays[i]));
        cJSON_AddItemToArray(json_relays, json_relay);
    }
    cJSON_AddItemToObject(json, "relays", json_relays);
    relay_free_list(relays);

    char *result = cJSON_Print(json);
    cJSON_Delete(json);

    cache_put_json_controller(controller->id, result);
    return result;
}

controller_t*
controller_get_by_id(int id)
{
    LOGGER_DEBUG("getting controller [id=%d] from database\n", id);
    sqlite3_stmt *stmt;

    sqlite3_prepare_v2(global_database, "SELECT * FROM controllers WHERE id = ?1;", -1, &stmt, NULL);
    sqlite3_bind_int(stmt, 1, id);

    controller_t **sql_result = controller_db_select(stmt);

    controller_t *result = sql_result[0];
    free(sql_result);

    return result;
}

controller_t*
controller_get_by_uid(uuid_t uid)
{
    char uuid_str[UUID_STR_LEN];
    uuid_unparse(uid, uuid_str);
    LOGGER_DEBUG("getting controller [uid=%s] from database\n", uuid_str);
    sqlite3_stmt *stmt;

    sqlite3_prepare_v2(global_database, "SELECT * FROM controllers WHERE uid = ?1;", -1, &stmt, NULL);
    sqlite3_bind_blob(stmt, 1, uid, sizeof(uuid_t), SQLITE_STATIC);

    controller_t **sql_result = controller_db_select(stmt);

    controller_t *result = sql_result[0];
    free(sql_result);

    return result;
}

controller_t**
controller_get_all()
{
    LOGGER_DEBUG("getting all controllers from database\n");
    sqlite3_stmt *stmt;

    sqlite3_prepare_v2(global_database, "SELECT * FROM controllers;", -1, &stmt, NULL);

    return controller_db_select(stmt);
}