/**
 * @file verify_commands.cpp
 * @brief Implementation of command handlers for the verify module
 *
 * Implements the command handlers for verifying package checksums and signatures.
 *
 * @copyright Copyright (c) 2025 SILO GROUP LLC
 * @author Chris Punches <chris.punches@silogroup.org>
 *
 * Part of the Dark Horse Linux Package Manager (DPM)
 */

#include "verify_commands.hpp"

int check_and_load_build_module(void*& module_handle) {
    // Get the module path using the new direct accessor
    const char* module_path = dpm_get_module_path();
    if (!module_path || strlen(module_path) == 0) {
        dpm_log(LOG_ERROR, "Module path not available");
        return 1;
    }

    // Create a proper path object
    std::filesystem::path modules_dir(module_path);

    // Build path to the build module
    std::filesystem::path build_module_path = modules_dir / "build.so";

    // Check if the file exists
    if (!std::filesystem::exists(build_module_path)) {
        dpm_log(LOG_ERROR, ("Build module not found at: " + build_module_path.string()).c_str());
        return 1;
    }

    // Load the module
    module_handle = dlopen(build_module_path.c_str(), RTLD_LAZY);
    if (!module_handle) {
        dpm_log(LOG_ERROR, ("Failed to load build module: " + std::string(dlerror())).c_str());
        return 1;
    }

    // Clear any error
    dlerror();

    return 0;
}

int cmd_checksum(int argc, char** argv) {
    // Parse command line arguments
    bool all_packages = false;
    std::string package_name = "";
    bool verbose = false;
    bool show_help = false;

    // Process command-line arguments
    for (int i = 1; i < argc; i++) {
        std::string arg = argv[i];

        if (arg == "-a" || arg == "--all") {
            all_packages = true;
        } else if (arg == "-p" || arg == "--package") {
            if (i + 1 < argc) {
                package_name = argv[i + 1];
                i++; // Skip the next argument
            }
        } else if (arg == "-v" || arg == "--verbose") {
            verbose = true;
        } else if (arg == "-h" || arg == "--help" || arg == "help") {
            show_help = true;
        }
    }

    // If help was requested, show it and return
    if (show_help) {
        dpm_con(LOG_INFO, "Usage: dpm verify checksum [options]");
        dpm_con(LOG_INFO, "");
        dpm_con(LOG_INFO, "Verifies the checksums of installed packages.");
        dpm_con(LOG_INFO, "");
        dpm_con(LOG_INFO, "Options:");
        dpm_con(LOG_INFO, "  -a, --all              Verify all installed packages");
        dpm_con(LOG_INFO, "  -p, --package NAME     Verify a specific package");
        dpm_con(LOG_INFO, "  -v, --verbose          Enable verbose output");
        dpm_con(LOG_INFO, "  -h, --help             Display this help message");
        dpm_con(LOG_INFO, "");
        dpm_con(LOG_INFO, "Examples:");
        dpm_con(LOG_INFO, "  dpm verify checksum --all");
        dpm_con(LOG_INFO, "  dpm verify checksum --package=mypackage");
        return 0;
    }

    // Set verbose logging if requested
    if (verbose) {
        dpm_set_logging_level(LOG_DEBUG);
    }

    // Validate that either all packages or a specific package is specified
    if (!all_packages && package_name.empty()) {
        dpm_con(LOG_ERROR, "Either --all or --package must be specified");
        return 1;
    }

    // Validate that both all packages and a specific package are not specified
    if (all_packages && !package_name.empty()) {
        dpm_con(LOG_ERROR, "Cannot specify both --all and --package");
        return 1;
    }

    // Placeholder implementation
    if (all_packages) {
        dpm_con(LOG_INFO, "Verifying checksums for all installed packages...");
        dpm_con(LOG_INFO, "Not yet implemented.");
    } else {
        dpm_con(LOG_INFO, ("Verifying checksums for package: " + package_name).c_str());
        dpm_con(LOG_INFO, "Not yet implemented.");
    }

    return 0;
}

int cmd_signature(int argc, char** argv) {
    // Parse command line arguments
    bool all_packages = false;
    std::string package_name = "";
    bool verbose = false;
    bool show_help = false;

    // Process command-line arguments
    for (int i = 1; i < argc; i++) {
        std::string arg = argv[i];

        if (arg == "-a" || arg == "--all") {
            all_packages = true;
        } else if (arg == "-p" || arg == "--package") {
            if (i + 1 < argc) {
                package_name = argv[i + 1];
                i++; // Skip the next argument
            }
        } else if (arg == "-v" || arg == "--verbose") {
            verbose = true;
        } else if (arg == "-h" || arg == "--help" || arg == "help") {
            show_help = true;
        }
    }

    // If help was requested, show it and return
    if (show_help) {
        dpm_con(LOG_INFO, "Usage: dpm verify signature [options]");
        dpm_con(LOG_INFO, "");
        dpm_con(LOG_INFO, "Verifies the signatures of installed packages.");
        dpm_con(LOG_INFO, "");
        dpm_con(LOG_INFO, "Options:");
        dpm_con(LOG_INFO, "  -a, --all              Verify all installed packages");
        dpm_con(LOG_INFO, "  -p, --package NAME     Verify a specific package");
        dpm_con(LOG_INFO, "  -v, --verbose          Enable verbose output");
        dpm_con(LOG_INFO, "  -h, --help             Display this help message");
        dpm_con(LOG_INFO, "");
        dpm_con(LOG_INFO, "Examples:");
        dpm_con(LOG_INFO, "  dpm verify signature --all");
        dpm_con(LOG_INFO, "  dpm verify signature --package=mypackage");
        return 0;
    }

    // Set verbose logging if requested
    if (verbose) {
        dpm_set_logging_level(LOG_DEBUG);
    }

    // Validate that either all packages or a specific package is specified
    if (!all_packages && package_name.empty()) {
        dpm_con(LOG_ERROR, "Either --all or --package must be specified");
        return 1;
    }

    // Validate that both all packages and a specific package are not specified
    if (all_packages && !package_name.empty()) {
        dpm_con(LOG_ERROR, "Cannot specify both --all and --package");
        return 1;
    }

    // Placeholder implementation
    if (all_packages) {
        dpm_con(LOG_INFO, "Verifying signatures for all installed packages...");
        dpm_con(LOG_INFO, "Not yet implemented.");
    } else {
        dpm_con(LOG_INFO, ("Verifying signatures for package: " + package_name).c_str());
        dpm_con(LOG_INFO, "Not yet implemented.");
    }

    return 0;
}

int cmd_help(int argc, char** argv) {
    dpm_con(LOG_INFO, "DPM Verify Module - Verifies the integrity and signatures of installed packages.");
    dpm_con(LOG_INFO, "");
    dpm_con(LOG_INFO, "Available commands:");
    dpm_con(LOG_INFO, "");
    dpm_con(LOG_INFO, "  checksum   - Verify checksums of installed packages");
    dpm_con(LOG_INFO, "  signature  - Verify signatures of installed packages");
    dpm_con(LOG_INFO, "  help       - Display this help message");
    dpm_con(LOG_INFO, "");
    dpm_con(LOG_INFO, "Usage: dpm verify <command>");
    dpm_con(LOG_INFO, "");
    dpm_con(LOG_INFO, "For command-specific help, use: dpm verify <command> --help");

    return 0;
}

int cmd_unknown(const char* command, int argc, char** argv) {
    std::string msg = "Unknown command: ";
    msg += (command ? command : "");
    dpm_con(LOG_WARN, msg.c_str());
    dpm_con(LOG_WARN, "Run 'dpm verify help' for a list of available commands");
    return 1;
}

Command parse_command(const char* cmd_str) {
    if (cmd_str == nullptr || strlen(cmd_str) == 0) {
        return CMD_HELP;
    }

    if (strcmp(cmd_str, "help") == 0) {
        return CMD_HELP;
    }
    else if (strcmp(cmd_str, "checksum") == 0) {
        return CMD_CHECKSUM;
    }
    else if (strcmp(cmd_str, "signature") == 0) {
        return CMD_SIGNATURE;
    }

    return CMD_UNKNOWN;
}