//! Geolog GUI - Graphical interface for geometric logic
//!
//! Usage: geolog-gui [workspace]
//!
//! Provides a graphical interface for:
//! - Browsing and editing theories and instances
//! - Visualizing chase execution
//! - Displaying relation graphs

use std::path::PathBuf;

use eframe::egui;

use geolog::gui::GeologApp;

const VERSION: &str = env!("CARGO_PKG_VERSION");

fn main() -> eframe::Result<()> {
    // Parse command line arguments
    let args: Vec<String> = std::env::args().skip(1).collect();
    let (workspace_path, source_files) = parse_args(&args);

    // Set up native window options
    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default()
            .with_inner_size([1200.0, 800.0])
            .with_min_inner_size([800.0, 600.0])
            .with_title(format!("Geolog v{}", VERSION)),
        ..Default::default()
    };

    // Run the application
    eframe::run_native(
        "Geolog",
        options,
        Box::new(move |cc| {
            // Set up custom fonts and styles
            setup_fonts(&cc.egui_ctx);

            // Create the app
            let mut app = if let Some(path) = workspace_path {
                GeologApp::with_path(cc, path)
            } else {
                GeologApp::new(cc)
            };

            // Load source files if provided
            for path in source_files {
                app.state.load_file(&path);
                app.state.execute_editor();
            }

            Ok(Box::new(app))
        }),
    )
}

/// Parse command line arguments
fn parse_args(args: &[String]) -> (Option<PathBuf>, Vec<PathBuf>) {
    let mut workspace_path = None;
    let mut source_files = Vec::new();
    let mut i = 0;

    while i < args.len() {
        let arg = &args[i];
        match arg.as_str() {
            "-d" | "--dir" => {
                if i + 1 < args.len() {
                    workspace_path = Some(PathBuf::from(&args[i + 1]));
                    i += 2;
                } else {
                    eprintln!("Error: -d requires a path argument");
                    std::process::exit(1);
                }
            }
            "-h" | "--help" => {
                println!("geolog-gui v{} - Geometric Logic GUI", VERSION);
                println!();
                println!("Usage: geolog-gui [OPTIONS] [source_files...]");
                println!();
                println!("Options:");
                println!("  -d, --dir <path>   Use <path> as workspace directory for persistence");
                println!("  -h, --help         Show this help message");
                println!("  -v, --version      Show version");
                println!();
                println!("Examples:");
                println!("  geolog-gui                     Start GUI (in-memory, no persistence)");
                println!("  geolog-gui -d ./myproject      Start GUI with workspace persistence");
                println!("  geolog-gui file.geolog         Load file.geolog on startup");
                std::process::exit(0);
            }
            "-v" | "--version" => {
                println!("geolog-gui v{}", VERSION);
                std::process::exit(0);
            }
            _ if arg.starts_with('-') => {
                eprintln!("Error: Unknown option '{}'", arg);
                eprintln!("Try 'geolog-gui --help' for usage information");
                std::process::exit(1);
            }
            _ => {
                // Positional argument - treat as source file
                source_files.push(PathBuf::from(arg));
                i += 1;
            }
        }
    }

    (workspace_path, source_files)
}

/// Set up custom fonts and styles
fn setup_fonts(ctx: &egui::Context) {
    // Use a slightly larger default font
    let mut style = (*ctx.style()).clone();
    style.text_styles.insert(
        egui::TextStyle::Body,
        egui::FontId::proportional(14.0),
    );
    style.text_styles.insert(
        egui::TextStyle::Heading,
        egui::FontId::proportional(18.0),
    );
    style.text_styles.insert(
        egui::TextStyle::Monospace,
        egui::FontId::monospace(13.0),
    );

    // Set up dark theme with custom colors
    style.visuals = egui::Visuals::dark();
    style.visuals.override_text_color = Some(egui::Color32::from_gray(220));

    ctx.set_style(style);
}