#include "cli/CliRunner.h"

#include <algorithm>
#include <iostream>
#include <string>

#ifndef NO_GUI
#include "gui/MainWindow.h"
#include <QApplication>
#endif

/**
 * @brief Application entry point.
 *
 * Supports two operating modes:
 *
 * **GUI mode** (default when compiled with Qt):
 *   Launches the Qt MainWindow.
 *
 * **CLI / batch mode** (activated by `--cli` or `--batch`):
 *   Processes files from the command line or a config file without any GUI.
 *   Progress is written to stderr; errors are logged but do not abort the batch.
 *
 * @note The `--batch` flag (or `--config <file>`) implies CLI mode.
 */
int main(int argc, char* argv[]) {
    // Determine whether CLI/batch mode was requested.
    bool cli_mode = false;
    for (int i = 1; i < argc; ++i) {
        const std::string arg{argv[i]};
        if (arg == "--cli" || arg == "--batch" || arg == "--config") {
            cli_mode = true;
            break;
        }
    }

    if (cli_mode) {
        // ── CLI / Batch mode (no Qt dependency) ─────────────────────────────
        auto config_result = photoconv::CliRunner::parse_args(argc, argv);
        if (!config_result.has_value()) {
            // "Help requested" is not an error – exit 0.
            const bool is_help = config_result.error().message == "Help requested";
            if (!is_help) {
                std::cerr << config_result.error().format() << std::endl;
            }
            return is_help ? 0 : 1;
        }

        photoconv::CliRunner runner;
        auto result = runner.run(config_result.value());
        if (!result.has_value()) {
            std::cerr << result.error().format() << std::endl;
            return 1;
        }

        // Exit code 0 if at least one file was converted, 1 otherwise.
        return result.value() > 0 ? 0 : 1;
    }

#ifndef NO_GUI
    // ── GUI mode ─────────────────────────────────────────────────────────────
    QApplication app{argc, argv};
    app.setApplicationName("Photo Converter");
    app.setApplicationVersion("0.1.0");
    app.setOrganizationName("photo-converter");

    photoconv::MainWindow window;
    window.show();

    return app.exec();
#else
    std::cerr << "This build was compiled without GUI support.\n"
                 "Use --cli or --batch mode.\n";
    return 1;
#endif
}