use std::io;
use std::path::PathBuf;
use std::str::FromStr;
use chrono::{Utc, Local, DateTime, TimeZone, FixedOffset};
use chrono::format::Fixed::TimezoneOffset;
use opencv::{core, imgcodecs, imgproc, highgui, prelude::*};

// Simplified camera module for demo
mod camera {
    use opencv::{core, prelude::*, videoio};
    use chrono::{DateTime, Utc};
    
    pub struct Frame {
        pub image: core::Mat,
        pub timestamp: DateTime<Utc>,
        pub index: u64,
    }
    
    impl Frame {
        pub fn new(image: core::Mat, timestamp: DateTime<Utc>, index: u64) -> Self {
            Self { image, timestamp, index }
        }
    }
    
    pub struct CameraDemo {
        capture: videoio::VideoCapture,
        frame_count: u64,
    }
    
    impl CameraDemo {
        pub fn new(device_id: i32) -> Result<Self, Box<dyn std::error::Error>> {
            let capture = videoio::VideoCapture::new(device_id, videoio::CAP_ANY)?;
            if !capture.is_opened()? {
                return Err(format!("Failed to open camera device {}", device_id).into());
            }
            
            Ok(Self {
                capture,
                frame_count: 0,
            })
        }
        
        pub fn from_file(path: &str) -> Result<Self, Box<dyn std::error::Error>> {
            let capture = videoio::VideoCapture::from_file(path, videoio::CAP_ANY)?;
            if !capture.is_opened()? {
                return Err(format!("Failed to open video file {}", path).into());
            }
            
            Ok(Self {
                capture,
                frame_count: 0,
            })
        }
        
        pub fn capture_frame(&mut self) -> Result<Frame, Box<dyn std::error::Error>> {
            let mut frame = core::Mat::default();
            if self.capture.read(&mut frame)? {
                if frame.empty() {
                    return Err("Captured frame is empty".into());
                }
                
                let timestamp = Utc::now();
                let index = self.frame_count;
                self.frame_count += 1;
                
                Ok(Frame::new(frame, timestamp, index))
            } else {
                Err("Failed to capture frame".into())
            }
        }
    }
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("*** Camera Module Demo ***");
    println!("This demo captures frames from a camera device or video file and displays them");
    println!("Press 'q' to quit");
    println!();
    
    println!("Choose input source:");
    println!("1. Camera device");
    println!("2. Video file");
    
    let mut choice = String::new();
    io::stdin().read_line(&mut choice)?;
    
    let mut camera_demo = match choice.trim() {
        "1" => {
            println!("Enter camera device ID (default is 0):");
            let mut device_id = String::new();
            io::stdin().read_line(&mut device_id)?;
            
            let device_id = device_id.trim().parse::<i32>().unwrap_or(0);
            println!("Opening camera device {}", device_id);
            camera::CameraDemo::new(device_id)?
        },
        "2" => {
            println!("Enter video file path:");
            let mut file_path = String::new();
            io::stdin().read_line(&mut file_path)?;
            
            let file_path = file_path.trim();
            println!("Opening video file: {}", file_path);
            camera::CameraDemo::from_file(file_path)?
        },
        _ => {
            println!("Invalid choice, using default camera (device 0)");
            camera::CameraDemo::new(0)?
        }
    };
    
    highgui::named_window("Camera Module Demo", highgui::WINDOW_NORMAL)?;
    
    loop {
        match camera_demo.capture_frame() {
            Ok(frame) => {
                // Add timestamp to the frame
                let mut display_frame = frame.image.clone();
                // Convert UTC timestamp to local time
                let local_timestamp = frame.timestamp.with_timezone(&Local);
                let timestamp_text = local_timestamp.format("%Y-%m-%d %H:%M:%S%.3f").to_string();

                imgproc::put_text(
                    &mut display_frame,
                    &timestamp_text,
                    core::Point::new(10, 30),
                    imgproc::FONT_HERSHEY_SIMPLEX,
                    1.0,
                    core::Scalar::new(0.0, 255.0, 0.0, 0.0),
                    2,
                    imgproc::LINE_AA,
                    false,
                )?;
                
                // Display the frame
                highgui::imshow("Camera Module Demo", &display_frame)?;
                
                // Break the loop if 'q' is pressed
                if highgui::wait_key(30)? == 'q' as i32 {
                    break;
                }
            },
            Err(e) => {
                println!("Error capturing frame: {}", e);
                break;
            }
        }
    }
    
    highgui::destroy_all_windows()?;
    
    Ok(())
}