/**
 * @file mining.c
 * @brief Synor Mining SDK implementation
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "synor/mining.h"

/* Forward declarations from common.c */
typedef struct synor_http_client synor_http_client_t;
synor_http_client_t* synor_http_client_create(
    const char* api_key, const char* endpoint,
    uint32_t timeout_ms, uint32_t retries, bool debug);
void synor_http_client_destroy(synor_http_client_t* client);
int synor_http_get(synor_http_client_t* client, const char* path,
    char** response, size_t* response_size);
int synor_http_post(synor_http_client_t* client, const char* path,
    const char* body, char** response, size_t* response_size);
int synor_http_put(synor_http_client_t* client, const char* path,
    const char* body, char** response, size_t* response_size);
int synor_http_delete(synor_http_client_t* client, const char* path,
    char** response, size_t* response_size);
char* synor_strdup(const char* s);
char* synor_url_encode(const char* s);

/* Internal mining structure */
struct synor_mining {
    synor_http_client_t* http;
    bool closed;
    bool debug;
    synor_stratum_connection_t* active_connection;
};

static const char* time_period_to_string(synor_time_period_t period) {
    switch (period) {
        case SYNOR_PERIOD_HOUR: return "hour";
        case SYNOR_PERIOD_DAY: return "day";
        case SYNOR_PERIOD_WEEK: return "week";
        case SYNOR_PERIOD_MONTH: return "month";
        case SYNOR_PERIOD_ALL: return "all";
        default: return "day";
    }
}

synor_mining_t* synor_mining_create(const synor_mining_config_t* config) {
    if (!config || !config->api_key) {
        return NULL;
    }

    synor_mining_t* mining = calloc(1, sizeof(synor_mining_t));
    if (!mining) return NULL;

    const char* endpoint = config->endpoint ?
        config->endpoint : "https://mining.synor.io/v1";
    uint32_t timeout = config->timeout_ms > 0 ? config->timeout_ms : 60000;
    uint32_t retries = config->retries > 0 ? config->retries : 3;

    mining->http = synor_http_client_create(
        config->api_key, endpoint, timeout, retries, config->debug);

    if (!mining->http) {
        free(mining);
        return NULL;
    }

    mining->closed = false;
    mining->debug = config->debug;
    mining->active_connection = NULL;
    return mining;
}

void synor_mining_destroy(synor_mining_t* mining) {
    if (!mining) return;
    mining->closed = true;
    if (mining->active_connection) {
        synor_stratum_connection_free(mining->active_connection);
        free(mining->active_connection);
    }
    synor_http_client_destroy(mining->http);
    free(mining);
}

bool synor_mining_is_closed(synor_mining_t* mining) {
    return mining ? mining->closed : true;
}

bool synor_mining_health_check(synor_mining_t* mining) {
    if (!mining || mining->closed) return false;

    char* response = NULL;
    size_t response_size = 0;

    if (synor_http_get(mining->http, "/health", &response, &response_size) != 0) {
        return false;
    }

    bool healthy = response && strstr(response, "\"healthy\"") != NULL;
    free(response);
    return healthy;
}

/* ==================== Pool Operations ==================== */

synor_mining_error_t synor_mining_connect(synor_mining_t* mining,
    const synor_pool_config_t* pool, synor_stratum_connection_t* result) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;
    if (!pool || !result) return SYNOR_MINING_ERROR_UNKNOWN;

    char body[1024];
    snprintf(body, sizeof(body), "{\"url\":\"%s\",\"user\":\"%s\"", pool->url, pool->user);
    if (pool->password) {
        char temp[256];
        snprintf(temp, sizeof(temp), ",\"password\":\"%s\"", pool->password);
        strncat(body, temp, sizeof(body) - strlen(body) - 1);
    }
    if (pool->algorithm) {
        char temp[128];
        snprintf(temp, sizeof(temp), ",\"algorithm\":\"%s\"", pool->algorithm);
        strncat(body, temp, sizeof(body) - strlen(body) - 1);
    }
    if (pool->difficulty > 0) {
        char temp[64];
        snprintf(temp, sizeof(temp), ",\"difficulty\":%.2f", pool->difficulty);
        strncat(body, temp, sizeof(body) - strlen(body) - 1);
    }
    strncat(body, "}", sizeof(body) - strlen(body) - 1);

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_post(mining->http, "/pool/connect", body, &response, &response_size);
    if (err != 0) {
        free(response);
        return SYNOR_MINING_ERROR_HTTP;
    }

    /* TODO: Parse JSON response and update active_connection */
    free(response);
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_disconnect(synor_mining_t* mining) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;
    if (!mining->active_connection) return SYNOR_MINING_OK;

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_post(mining->http, "/pool/disconnect", "{}", &response, &response_size);
    free(response);

    if (err == 0) {
        if (mining->active_connection) {
            synor_stratum_connection_free(mining->active_connection);
            free(mining->active_connection);
            mining->active_connection = NULL;
        }
        return SYNOR_MINING_OK;
    }
    return SYNOR_MINING_ERROR_HTTP;
}

synor_mining_error_t synor_mining_get_connection(synor_mining_t* mining,
    synor_stratum_connection_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_get_pool_stats(synor_mining_t* mining,
    synor_pool_stats_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

bool synor_mining_is_connected(synor_mining_t* mining) {
    if (!mining || !mining->active_connection) return false;
    return mining->active_connection->status == SYNOR_CONN_CONNECTED;
}

void synor_stratum_connection_free(synor_stratum_connection_t* conn) {
    if (!conn) return;
    free(conn->id);
    free(conn->pool);
    free(conn->algorithm);
}

void synor_pool_stats_free(synor_pool_stats_t* stats) {
    if (!stats) return;
    free(stats->url);
}

/* ==================== Mining Operations ==================== */

synor_mining_error_t synor_mining_get_block_template(synor_mining_t* mining,
    synor_block_template_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_submit_work(synor_mining_t* mining,
    const synor_mined_work_t* work, synor_submit_result_t* result) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;
    if (!work || !result) return SYNOR_MINING_ERROR_UNKNOWN;

    char body[1024];
    snprintf(body, sizeof(body),
        "{\"templateId\":\"%s\",\"nonce\":\"%s\",\"extraNonce\":\"%s\",\"timestamp\":%lld,\"hash\":\"%s\"}",
        work->template_id, work->nonce, work->extra_nonce,
        (long long)work->timestamp, work->hash);

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_post(mining->http, "/mining/submit", body, &response, &response_size);
    if (err != 0) {
        free(response);
        return SYNOR_MINING_ERROR_HTTP;
    }

    /* TODO: Parse JSON response */
    free(response);
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_start(synor_mining_t* mining, const char* algorithm) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;

    char body[256];
    if (algorithm) {
        snprintf(body, sizeof(body), "{\"algorithm\":\"%s\"}", algorithm);
    } else {
        snprintf(body, sizeof(body), "{}");
    }

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_post(mining->http, "/mining/start", body, &response, &response_size);
    free(response);
    return err == 0 ? SYNOR_MINING_OK : SYNOR_MINING_ERROR_HTTP;
}

synor_mining_error_t synor_mining_stop(synor_mining_t* mining) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_post(mining->http, "/mining/stop", "{}", &response, &response_size);
    free(response);
    return err == 0 ? SYNOR_MINING_OK : SYNOR_MINING_ERROR_HTTP;
}

synor_mining_error_t synor_mining_is_mining(synor_mining_t* mining, bool* result) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;
    if (!result) return SYNOR_MINING_ERROR_UNKNOWN;

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_get(mining->http, "/mining/status", &response, &response_size);
    if (err != 0) {
        free(response);
        return SYNOR_MINING_ERROR_HTTP;
    }

    *result = response && strstr(response, "\"mining\":true") != NULL;
    free(response);
    return SYNOR_MINING_OK;
}

void synor_block_template_free(synor_block_template_t* tmpl) {
    if (!tmpl) return;
    free(tmpl->id);
    free(tmpl->previous_block_hash);
    free(tmpl->merkle_root);
    free(tmpl->bits);
    free(tmpl->coinbase_value);
    for (size_t i = 0; i < tmpl->transactions_count; i++) {
        free(tmpl->transactions[i].txid);
        free(tmpl->transactions[i].data);
        free(tmpl->transactions[i].fee);
    }
    free(tmpl->transactions);
    free(tmpl->target);
    free(tmpl->algorithm);
    free(tmpl->extra_nonce);
}

void synor_submit_result_free(synor_submit_result_t* result) {
    if (!result) return;
    free(result->share.hash);
    free(result->reason);
    free(result->block_hash);
    free(result->reward);
}

/* ==================== Stats Operations ==================== */

synor_mining_error_t synor_mining_get_hashrate(synor_mining_t* mining,
    synor_hashrate_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_get_stats(synor_mining_t* mining,
    synor_mining_stats_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_get_earnings(synor_mining_t* mining,
    synor_time_period_t* period, synor_earnings_t* result) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;

    char path[128];
    if (period) {
        snprintf(path, sizeof(path), "/stats/earnings?period=%s", time_period_to_string(*period));
    } else {
        snprintf(path, sizeof(path), "/stats/earnings");
    }

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_get(mining->http, path, &response, &response_size);
    if (err != 0) {
        free(response);
        return SYNOR_MINING_ERROR_HTTP;
    }

    /* TODO: Parse JSON response */
    (void)result;
    free(response);
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_get_share_stats(synor_mining_t* mining,
    synor_share_stats_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

void synor_hashrate_free(synor_hashrate_t* hashrate) {
    if (!hashrate) return;
    free(hashrate->unit);
}

void synor_mining_stats_free(synor_mining_stats_t* stats) {
    if (!stats) return;
    synor_hashrate_free(&stats->hashrate);
    free(stats->earnings.today);
    free(stats->earnings.yesterday);
    free(stats->earnings.this_week);
    free(stats->earnings.this_month);
    free(stats->earnings.total);
    free(stats->earnings.currency);
}

void synor_earnings_free(synor_earnings_t* earnings) {
    if (!earnings) return;
    free(earnings->amount);
    free(earnings->currency);
    for (size_t i = 0; i < earnings->breakdown_count; i++) {
        free(earnings->breakdown[i].amount);
    }
    free(earnings->breakdown);
}

/* ==================== Device Operations ==================== */

synor_mining_error_t synor_mining_list_devices(synor_mining_t* mining,
    synor_mining_device_list_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_get_device(synor_mining_t* mining,
    const char* device_id, synor_mining_device_t* result) {
    (void)mining; (void)device_id; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_set_device_config(synor_mining_t* mining,
    const char* device_id, const synor_device_config_t* config,
    synor_mining_device_t* result) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;
    if (!device_id || !config || !result) return SYNOR_MINING_ERROR_UNKNOWN;

    char body[512];
    snprintf(body, sizeof(body), "{\"enabled\":%s", config->enabled ? "true" : "false");
    if (config->intensity > 0) {
        char temp[32];
        snprintf(temp, sizeof(temp), ",\"intensity\":%d", config->intensity);
        strncat(body, temp, sizeof(body) - strlen(body) - 1);
    }
    if (config->power_limit > 0) {
        char temp[32];
        snprintf(temp, sizeof(temp), ",\"powerLimit\":%d", config->power_limit);
        strncat(body, temp, sizeof(body) - strlen(body) - 1);
    }
    strncat(body, "}", sizeof(body) - strlen(body) - 1);

    char path[256];
    char* encoded = synor_url_encode(device_id);
    snprintf(path, sizeof(path), "/devices/%s/config", encoded);
    free(encoded);

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_put(mining->http, path, body, &response, &response_size);
    if (err != 0) {
        free(response);
        return SYNOR_MINING_ERROR_HTTP;
    }

    /* TODO: Parse JSON response */
    free(response);
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_enable_device(synor_mining_t* mining,
    const char* device_id) {
    synor_device_config_t config = { .enabled = true };
    synor_mining_device_t result;
    return synor_mining_set_device_config(mining, device_id, &config, &result);
}

synor_mining_error_t synor_mining_disable_device(synor_mining_t* mining,
    const char* device_id) {
    synor_device_config_t config = { .enabled = false };
    synor_mining_device_t result;
    return synor_mining_set_device_config(mining, device_id, &config, &result);
}

void synor_mining_device_free(synor_mining_device_t* device) {
    if (!device) return;
    free(device->id);
    free(device->name);
    free(device->driver);
    free(device->firmware);
}

void synor_mining_device_list_free(synor_mining_device_list_t* list) {
    if (!list) return;
    for (size_t i = 0; i < list->count; i++) {
        synor_mining_device_free(&list->devices[i]);
    }
    free(list->devices);
    list->devices = NULL;
    list->count = 0;
}

/* ==================== Worker Operations ==================== */

synor_mining_error_t synor_mining_list_workers(synor_mining_t* mining,
    synor_worker_info_list_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_get_worker(synor_mining_t* mining,
    const char* worker_id, synor_worker_info_t* result) {
    (void)mining; (void)worker_id; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_remove_worker(synor_mining_t* mining,
    const char* worker_id) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;
    if (!worker_id) return SYNOR_MINING_ERROR_UNKNOWN;

    char path[256];
    char* encoded = synor_url_encode(worker_id);
    snprintf(path, sizeof(path), "/workers/%s", encoded);
    free(encoded);

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_delete(mining->http, path, &response, &response_size);
    free(response);
    return err == 0 ? SYNOR_MINING_OK : SYNOR_MINING_ERROR_HTTP;
}

void synor_worker_info_free(synor_worker_info_t* worker) {
    if (!worker) return;
    free(worker->id);
    free(worker->name);
    synor_hashrate_free(&worker->hashrate);
    for (size_t i = 0; i < worker->devices_count; i++) {
        synor_mining_device_free(&worker->devices[i]);
    }
    free(worker->devices);
}

void synor_worker_info_list_free(synor_worker_info_list_t* list) {
    if (!list) return;
    for (size_t i = 0; i < list->count; i++) {
        synor_worker_info_free(&list->workers[i]);
    }
    free(list->workers);
    list->workers = NULL;
    list->count = 0;
}

/* ==================== Algorithm Operations ==================== */

synor_mining_error_t synor_mining_list_algorithms(synor_mining_t* mining,
    synor_mining_algorithm_list_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_get_algorithm(synor_mining_t* mining,
    const char* name, synor_mining_algorithm_t* result) {
    (void)mining; (void)name; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

synor_mining_error_t synor_mining_switch_algorithm(synor_mining_t* mining,
    const char* algorithm) {
    if (!mining || mining->closed) return SYNOR_MINING_ERROR_CLIENT_CLOSED;
    if (!algorithm) return SYNOR_MINING_ERROR_UNKNOWN;

    char body[128];
    snprintf(body, sizeof(body), "{\"algorithm\":\"%s\"}", algorithm);

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_post(mining->http, "/algorithms/switch", body, &response, &response_size);
    free(response);
    return err == 0 ? SYNOR_MINING_OK : SYNOR_MINING_ERROR_HTTP;
}

synor_mining_error_t synor_mining_get_most_profitable(synor_mining_t* mining,
    synor_mining_algorithm_t* result) {
    (void)mining; (void)result;
    return SYNOR_MINING_ERROR_UNKNOWN;
}

void synor_mining_algorithm_free(synor_mining_algorithm_t* algorithm) {
    if (!algorithm) return;
    free(algorithm->name);
    free(algorithm->display_name);
    free(algorithm->hash_unit);
    free(algorithm->profitability);
    free(algorithm->block_reward);
}

void synor_mining_algorithm_list_free(synor_mining_algorithm_list_t* list) {
    if (!list) return;
    for (size_t i = 0; i < list->count; i++) {
        synor_mining_algorithm_free(&list->algorithms[i]);
    }
    free(list->algorithms);
    list->algorithms = NULL;
    list->count = 0;
}
