/**
 * @file bridge.c
 * @brief Synor Bridge SDK implementation
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "synor/bridge.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);
synor_error_t synor_http_get(synor_http_client_t* client, const char* path,
    char** response, size_t* response_size);
synor_error_t synor_http_post(synor_http_client_t* client, const char* path,
    const char* body, char** response, size_t* response_size);
char* synor_strdup(const char* s);
char* synor_url_encode(const char* s);

/* Internal bridge structure */
struct synor_bridge {
    synor_http_client_t* http;
    bool closed;
    bool debug;
};

static const char* chain_id_to_string(synor_chain_id_t id) {
    switch (id) {
        case SYNOR_CHAIN_SYNOR: return "synor";
        case SYNOR_CHAIN_ETHEREUM: return "ethereum";
        case SYNOR_CHAIN_POLYGON: return "polygon";
        case SYNOR_CHAIN_ARBITRUM: return "arbitrum";
        case SYNOR_CHAIN_OPTIMISM: return "optimism";
        case SYNOR_CHAIN_BSC: return "bsc";
        case SYNOR_CHAIN_AVALANCHE: return "avalanche";
        case SYNOR_CHAIN_SOLANA: return "solana";
        case SYNOR_CHAIN_COSMOS: return "cosmos";
        default: return "unknown";
    }
}

synor_bridge_t* synor_bridge_create(const synor_bridge_config_t* config) {
    if (!config || !config->api_key) {
        return NULL;
    }

    synor_bridge_t* bridge = calloc(1, sizeof(synor_bridge_t));
    if (!bridge) return NULL;

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

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

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

    bridge->closed = false;
    bridge->debug = config->debug;
    return bridge;
}

void synor_bridge_destroy(synor_bridge_t* bridge) {
    if (!bridge) return;
    bridge->closed = true;
    synor_http_client_destroy(bridge->http);
    free(bridge);
}

bool synor_bridge_is_closed(synor_bridge_t* bridge) {
    return bridge ? bridge->closed : true;
}

bool synor_bridge_health_check(synor_bridge_t* bridge) {
    if (!bridge || bridge->closed) return false;

    char* response = NULL;
    size_t response_size = 0;

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

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

/* ==================== Chain Operations ==================== */

synor_bridge_error_t synor_bridge_get_supported_chains(synor_bridge_t* bridge,
    synor_chain_list_t* result) {
    (void)bridge; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_get_chain(synor_bridge_t* bridge,
    synor_chain_id_t chain_id, synor_chain_t* result) {
    (void)bridge; (void)chain_id; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

bool synor_bridge_is_chain_supported(synor_bridge_t* bridge, synor_chain_id_t chain_id) {
    synor_chain_t chain;
    if (synor_bridge_get_chain(bridge, chain_id, &chain) != SYNOR_BRIDGE_OK) {
        return false;
    }
    bool supported = chain.supported;
    synor_chain_free(&chain);
    return supported;
}

void synor_chain_free(synor_chain_t* chain) {
    if (!chain) return;
    free(chain->name);
    free(chain->rpc_url);
    free(chain->explorer_url);
    free(chain->native_currency.name);
    free(chain->native_currency.symbol);
}

void synor_chain_list_free(synor_chain_list_t* list) {
    if (!list) return;
    for (size_t i = 0; i < list->count; i++) {
        synor_chain_free(&list->chains[i]);
    }
    free(list->chains);
    list->chains = NULL;
    list->count = 0;
}

/* ==================== Asset Operations ==================== */

synor_bridge_error_t synor_bridge_get_supported_assets(synor_bridge_t* bridge,
    synor_chain_id_t chain_id, synor_asset_list_t* result) {
    (void)bridge; (void)chain_id; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_get_asset(synor_bridge_t* bridge,
    const char* asset_id, synor_asset_t* result) {
    (void)bridge; (void)asset_id; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_get_wrapped_asset(synor_bridge_t* bridge,
    const char* original_asset_id, synor_chain_id_t target_chain,
    synor_wrapped_asset_t* result) {
    (void)bridge; (void)original_asset_id; (void)target_chain; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

void synor_asset_free(synor_asset_t* asset) {
    if (!asset) return;
    free(asset->id);
    free(asset->symbol);
    free(asset->name);
    free(asset->contract_address);
    free(asset->logo_url);
}

void synor_asset_list_free(synor_asset_list_t* list) {
    if (!list) return;
    for (size_t i = 0; i < list->count; i++) {
        synor_asset_free(&list->assets[i]);
    }
    free(list->assets);
    list->assets = NULL;
    list->count = 0;
}

void synor_wrapped_asset_free(synor_wrapped_asset_t* asset) {
    if (!asset) return;
    synor_asset_free(&asset->original_asset);
    synor_asset_free(&asset->wrapped_asset);
    free(asset->bridge_contract);
}

/* ==================== Fee Operations ==================== */

synor_bridge_error_t synor_bridge_estimate_fee(synor_bridge_t* bridge,
    const char* asset, const char* amount,
    synor_chain_id_t source_chain, synor_chain_id_t target_chain,
    synor_fee_estimate_t* result) {
    if (!bridge || bridge->closed) return SYNOR_BRIDGE_ERROR_CLIENT_CLOSED;
    if (!asset || !amount || !result) return SYNOR_BRIDGE_ERROR_UNKNOWN;

    char body[1024];
    snprintf(body, sizeof(body),
        "{\"asset\":\"%s\",\"amount\":\"%s\",\"sourceChain\":\"%s\",\"targetChain\":\"%s\"}",
        asset, amount, chain_id_to_string(source_chain), chain_id_to_string(target_chain));

    char* response = NULL;
    size_t response_size = 0;

    int err = synor_http_post(bridge->http, "/fees/estimate", body, &response, &response_size);
    if (err != 0) {
        free(response);
        return SYNOR_BRIDGE_ERROR_HTTP;
    }

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

synor_bridge_error_t synor_bridge_get_exchange_rate(synor_bridge_t* bridge,
    const char* from_asset, const char* to_asset, synor_exchange_rate_t* result) {
    (void)bridge; (void)from_asset; (void)to_asset; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

void synor_fee_estimate_free(synor_fee_estimate_t* fee) {
    if (!fee) return;
    free(fee->bridge_fee);
    free(fee->gas_fee_source);
    free(fee->gas_fee_target);
    free(fee->total_fee);
    synor_asset_free(&fee->fee_asset);
    free(fee->exchange_rate);
}

void synor_exchange_rate_free(synor_exchange_rate_t* rate) {
    if (!rate) return;
    synor_asset_free(&rate->from_asset);
    synor_asset_free(&rate->to_asset);
    free(rate->rate);
    free(rate->inverse_rate);
    free(rate->source);
}

/* ==================== Lock-Mint Flow ==================== */

synor_bridge_error_t synor_bridge_lock(synor_bridge_t* bridge,
    const char* asset, const char* amount, synor_chain_id_t target_chain,
    const synor_lock_options_t* options, synor_lock_receipt_t* result) {
    (void)bridge; (void)asset; (void)amount; (void)target_chain;
    (void)options; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_get_lock_proof(synor_bridge_t* bridge,
    const char* lock_receipt_id, synor_lock_proof_t* result) {
    (void)bridge; (void)lock_receipt_id; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_wait_for_lock_proof(synor_bridge_t* bridge,
    const char* lock_receipt_id, uint32_t poll_interval_ms, uint32_t max_wait_ms,
    synor_lock_proof_t* result) {
    (void)bridge; (void)lock_receipt_id; (void)poll_interval_ms;
    (void)max_wait_ms; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_mint(synor_bridge_t* bridge,
    const synor_lock_proof_t* proof, const char* target_address,
    const synor_mint_options_t* options, synor_signed_tx_t* result) {
    (void)bridge; (void)proof; (void)target_address; (void)options; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

void synor_lock_receipt_free(synor_lock_receipt_t* receipt) {
    if (!receipt) return;
    free(receipt->id);
    free(receipt->tx_hash);
    synor_asset_free(&receipt->asset);
    free(receipt->amount);
    free(receipt->sender);
    free(receipt->recipient);
}

void synor_lock_proof_free(synor_lock_proof_t* proof) {
    if (!proof) return;
    synor_lock_receipt_free(&proof->lock_receipt);
    for (size_t i = 0; i < proof->merkle_proof_count; i++) {
        free(proof->merkle_proof[i]);
    }
    free(proof->merkle_proof);
    free(proof->block_header);
    for (size_t i = 0; i < proof->signature_count; i++) {
        free(proof->signatures[i].validator);
        free(proof->signatures[i].signature);
    }
    free(proof->signatures);
}

/* ==================== Burn-Unlock Flow ==================== */

synor_bridge_error_t synor_bridge_burn(synor_bridge_t* bridge,
    const char* wrapped_asset, const char* amount,
    const synor_burn_options_t* options, synor_burn_receipt_t* result) {
    (void)bridge; (void)wrapped_asset; (void)amount; (void)options; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_get_burn_proof(synor_bridge_t* bridge,
    const char* burn_receipt_id, synor_burn_proof_t* result) {
    (void)bridge; (void)burn_receipt_id; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_wait_for_burn_proof(synor_bridge_t* bridge,
    const char* burn_receipt_id, uint32_t poll_interval_ms, uint32_t max_wait_ms,
    synor_burn_proof_t* result) {
    (void)bridge; (void)burn_receipt_id; (void)poll_interval_ms;
    (void)max_wait_ms; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_unlock(synor_bridge_t* bridge,
    const synor_burn_proof_t* proof, const synor_unlock_options_t* options,
    synor_signed_tx_t* result) {
    (void)bridge; (void)proof; (void)options; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

void synor_burn_receipt_free(synor_burn_receipt_t* receipt) {
    if (!receipt) return;
    free(receipt->id);
    free(receipt->tx_hash);
    synor_asset_free(&receipt->wrapped_asset);
    synor_asset_free(&receipt->original_asset);
    free(receipt->amount);
    free(receipt->sender);
    free(receipt->recipient);
}

void synor_burn_proof_free(synor_burn_proof_t* proof) {
    if (!proof) return;
    synor_burn_receipt_free(&proof->burn_receipt);
    for (size_t i = 0; i < proof->merkle_proof_count; i++) {
        free(proof->merkle_proof[i]);
    }
    free(proof->merkle_proof);
    free(proof->block_header);
    for (size_t i = 0; i < proof->signature_count; i++) {
        free(proof->signatures[i].validator);
        free(proof->signatures[i].signature);
    }
    free(proof->signatures);
}

/* ==================== Transfer Operations ==================== */

synor_bridge_error_t synor_bridge_get_transfer(synor_bridge_t* bridge,
    const char* transfer_id, synor_transfer_t* result) {
    (void)bridge; (void)transfer_id; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_get_transfer_status(synor_bridge_t* bridge,
    const char* transfer_id, synor_transfer_status_t* status) {
    synor_transfer_t transfer;
    synor_bridge_error_t err = synor_bridge_get_transfer(bridge, transfer_id, &transfer);
    if (err != SYNOR_BRIDGE_OK) return err;
    *status = transfer.status;
    synor_transfer_free(&transfer);
    return SYNOR_BRIDGE_OK;
}

synor_bridge_error_t synor_bridge_list_transfers(synor_bridge_t* bridge,
    const synor_transfer_filter_t* filter, synor_transfer_list_t* result) {
    (void)bridge; (void)filter; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_wait_for_transfer(synor_bridge_t* bridge,
    const char* transfer_id, uint32_t poll_interval_ms, uint32_t max_wait_ms,
    synor_transfer_t* result) {
    (void)bridge; (void)transfer_id; (void)poll_interval_ms;
    (void)max_wait_ms; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

void synor_transfer_free(synor_transfer_t* transfer) {
    if (!transfer) return;
    free(transfer->id);
    synor_asset_free(&transfer->asset);
    free(transfer->amount);
    free(transfer->sender);
    free(transfer->recipient);
    free(transfer->source_tx_hash);
    free(transfer->target_tx_hash);
    free(transfer->fee);
    synor_asset_free(&transfer->fee_asset);
    free(transfer->error_message);
}

void synor_transfer_list_free(synor_transfer_list_t* list) {
    if (!list) return;
    for (size_t i = 0; i < list->count; i++) {
        synor_transfer_free(&list->transfers[i]);
    }
    free(list->transfers);
    list->transfers = NULL;
    list->count = 0;
}

void synor_signed_tx_free(synor_signed_tx_t* tx) {
    if (!tx) return;
    free(tx->tx_hash);
    free(tx->from);
    free(tx->to);
    free(tx->value);
    free(tx->data);
    free(tx->gas_limit);
    free(tx->gas_price);
    free(tx->max_fee_per_gas);
    free(tx->max_priority_fee_per_gas);
    free(tx->signature);
}

/* ==================== Convenience Functions ==================== */

synor_bridge_error_t synor_bridge_bridge_to(synor_bridge_t* bridge,
    const char* asset, const char* amount, synor_chain_id_t target_chain,
    const char* target_address, const synor_lock_options_t* lock_options,
    const synor_mint_options_t* mint_options, synor_transfer_t* result) {
    (void)bridge; (void)asset; (void)amount; (void)target_chain;
    (void)target_address; (void)lock_options; (void)mint_options; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}

synor_bridge_error_t synor_bridge_bridge_back(synor_bridge_t* bridge,
    const char* wrapped_asset, const char* amount,
    const synor_burn_options_t* burn_options,
    const synor_unlock_options_t* unlock_options, synor_transfer_t* result) {
    (void)bridge; (void)wrapped_asset; (void)amount;
    (void)burn_options; (void)unlock_options; (void)result;
    return SYNOR_BRIDGE_ERROR_UNKNOWN;
}
