#include "screen_capture.h"
#include <iostream>

// TODO: Include FFmpeg headers when implementing
// extern "C" {
// #include <libavcodec/avcodec.h>
// #include <libavformat/avformat.h>
// #include <libavutil/avutil.h>
// }

// TODO: Include DBus/Portal headers for Wayland
// #include <dbus/dbus.h>

namespace scar {

ScreenCapture::ScreenCapture()
    : capturing_(false) {
    backend_ = detectBestBackend();
}

ScreenCapture::~ScreenCapture() {
    stop();
}

ScreenCaptureBackend ScreenCapture::detectBestBackend() {
#ifdef _WIN32
    return ScreenCaptureBackend::FFMPEG_WINDOWS;
#else
    // Check for Wayland/Hyprland
    const char* waylandDisplay = std::getenv("WAYLAND_DISPLAY");
    const char* hyprlandInstance = std::getenv("HYPRLAND_INSTANCE_SIGNATURE");
    
    if (waylandDisplay || hyprlandInstance) {
        std::cout << "Detected Wayland/Hyprland environment" << std::endl;
        return ScreenCaptureBackend::PORTAL_PIPEWIRE;
    }
    
    // Fallback to X11
    std::cout << "Detected X11 environment" << std::endl;
    return ScreenCaptureBackend::FFMPEG_X11;
#endif
}

bool ScreenCapture::start() {
    return start(backend_);
}

bool ScreenCapture::start(ScreenCaptureBackend backend) {
    if (capturing_) {
        return true;
    }
    
    backend_ = backend;
    
    switch (backend_) {
        case ScreenCaptureBackend::FFMPEG_X11:
            return startX11Capture();
        case ScreenCaptureBackend::FFMPEG_WAYLAND:
        case ScreenCaptureBackend::PORTAL_PIPEWIRE:
            return startWaylandCapture();
        case ScreenCaptureBackend::FFMPEG_WINDOWS:
            return startWindowsCapture();
    }
    
    return false;
}

void ScreenCapture::stop() {
    if (!capturing_) {
        return;
    }
    
    std::cout << "Stopping screen capture..." << std::endl;
    
    // TODO: Clean up FFmpeg resources
    // avformat_close_input(&formatCtx_);
    // avcodec_free_context(&codecCtx_);
    // av_frame_free(&frame_);
    
    capturing_ = false;
}

void ScreenCapture::setFrameCallback(FrameCallback callback) {
    frameCallback_ = std::move(callback);
}

bool ScreenCapture::startX11Capture() {
    std::cout << "Starting X11 screen capture via FFmpeg..." << std::endl;
    
    // TODO: Implement X11 capture using FFmpeg
    // 1. Open x11grab input device
    // 2. Set up video codec (H.264 or raw)
    // 3. Read frames in loop
    // 4. Call frameCallback_ for each frame
    // Example: ffmpeg -f x11grab -i :0.0 -c:v libx264 ...
    
    capturing_ = true;
    return true;
}

bool ScreenCapture::startWaylandCapture() {
    std::cout << "Starting Wayland screen capture via xdg-desktop-portal + Pipewire..." << std::endl;
    
    // TODO: Implement portal-based capture
    // 1. Connect to DBus
    // 2. Call org.freedesktop.portal.ScreenCast.CreateSession
    // 3. Select sources via SelectSources
    // 4. Start the session
    // 5. Retrieve Pipewire node ID
    // 6. Connect to Pipewire stream using node ID
    // 7. Read frames and call frameCallback_
    
    // Note: May need to prompt user for screen selection dialog
    
    capturing_ = true;
    return true;
}

bool ScreenCapture::startWindowsCapture() {
    std::cout << "Starting Windows screen capture via FFmpeg..." << std::endl;
    
    // TODO: Implement Windows GDI capture using FFmpeg
    // 1. Open gdigrab input device
    // 2. Set up video codec
    // 3. Read frames in loop
    // 4. Call frameCallback_ for each frame
    // Example: ffmpeg -f gdigrab -i desktop -c:v libx264 ...
    
    capturing_ = true;
    return true;
}

bool ScreenCapture::startPortalCapture() {
    return startWaylandCapture(); // Same implementation
}

} // namespace scar