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use serde::{
    Deserialize, 
    Serialize
};

use crate::{
    error
};

use sciimg::cahvor::Cahvor;

use std::fs::File;
use std::io::Read;

pub trait ImageMetadata {
    fn get_link(&self) -> String;
    fn get_credit(&self) -> String;
    fn get_sol(&self) -> u32;
    fn get_imageid(&self) -> String;
    fn get_caption(&self) -> String;
    fn get_date_taken_utc(&self) -> String;
    fn get_date_taken_mars(&self) -> Option<String>;
    fn get_subframe_rect(&self) -> Option<Vec<f64>>;
    // fn get_dimension(&self) -> Option<&[f64]>;
    fn get_scale_factor(&self) -> u32;
    fn get_instrument(&self) -> String;
    fn get_filter_name(&self) -> Option<String>;
    fn get_camera_vector(&self) -> Option<Vec<f64>>;
    fn get_camera_model_component_list(&self) -> Option<Cahvor>;
    fn get_camera_position(&self) -> Option<Vec<f64>>;
    fn get_camera_model_type(&self) -> Option<String>;
    fn get_site(&self) -> Option<u32>;
    fn get_drive(&self) -> Option<u32>;
    fn get_mast_az(&self) -> Option<f64>;
    fn get_mast_el(&self) -> Option<f64>;
    fn get_sclk(&self) -> Option<f64>;
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct Metadata  {
    pub link:String,
    pub credit:String,
    pub sol:u32,
    pub imageid:String,
    pub caption:String,
    pub date_taken_utc:String,
    pub date_taken_mars:Option<String>,
    pub subframe_rect:Option<Vec<f64>>,
    pub scale_factor:u32,
    pub instrument:String,
    pub filter_name: Option<String>,
    pub camera_vector:Option<Vec<f64>>,
    pub mast_az: Option<f64>,
    pub mast_el: Option<f64>,
    pub sclk: Option<f64>,

    #[serde(with = "crate::jsonfetch::tuple_format")]
    pub camera_position: Option<Vec<f64>>,
    pub camera_model_type: Option<String>,
    pub site:Option<u32>,
    pub drive:Option<u32>,

    #[serde(with = "crate::jsonfetch::cahvor_format")]
    pub camera_model_component_list: Option<Cahvor>,

    #[serde(default = "default_step_status")]
    pub decompand:bool,

    #[serde(default = "default_step_status")]
    pub debayer:bool,

    #[serde(default = "default_step_status")]
    pub flatfield:bool,

    #[serde(default = "default_step_status")]
    pub radiometric:bool,

    #[serde(default = "default_step_status")]
    pub inpaint:bool,

    #[serde(default = "default_step_status")]
    pub cropped:bool
}

fn default_step_status() -> bool {
    false
}

pub fn convert_to_std_metadata<T:ImageMetadata>(im:&T) -> Metadata {
    Metadata{
        link:im.get_link(),
        credit:im.get_credit(),
        sol:im.get_sol(),
        imageid:im.get_imageid(),
        caption:im.get_caption(),
        date_taken_utc:im.get_date_taken_utc(),
        date_taken_mars:im.get_date_taken_mars(),
        subframe_rect:im.get_subframe_rect(),
        scale_factor:im.get_scale_factor(),
        instrument:im.get_instrument(),
        filter_name:im.get_filter_name(),
        decompand:default_step_status(),
        debayer:default_step_status(),
        flatfield:default_step_status(),
        radiometric:default_step_status(),
        inpaint:default_step_status(),
        cropped:default_step_status(),
        camera_vector:im.get_camera_vector(),
        camera_model_component_list:im.get_camera_model_component_list(),
        camera_position:im.get_camera_position(),
        camera_model_type:im.get_camera_model_type(),
        site:im.get_site(),
        drive:im.get_drive(),
        mast_el:im.get_mast_el(),
        mast_az:im.get_mast_az(),
        sclk:im.get_sclk(),
    }
}


pub fn load_image_metadata(json_path:&String) -> error::Result<Metadata> {
    let mut file = match File::open(&json_path) {
        Err(why) => panic!("couldn't open {}", why),
        Ok(file) => file,
    };

    let mut buf : Vec<u8> = Vec::default();
    file.read_to_end(&mut buf).unwrap();
    let json = String::from_utf8(buf).unwrap();

    let metadata = serde_json::from_str(&json).unwrap();

    Ok(metadata)
}