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//! More convenient matrix writer

use std::collections::HashMap;
use std::fs::File;
use std::io::Write;
use std::process::exit;
use Matrix;
use Pickle;
pub use ToWriter::{Data, Header, Path, Round};

#[derive(Debug, Clone, Copy, Hash, PartialOrd, PartialEq, Eq)]
pub enum ToWriter {
    Header,
    Round,
    Data,
    Path,
}

#[derive(Debug, Clone, Copy)]
pub enum Queue {
    Matrix,
    Vector,
}

/// Simple Matrix Writer
///
/// # Necessary Fields
/// * `data: Vec<Matrix>`
/// * `path: String`
///
/// # Option
/// * `header: Vec<String>`
/// * `round: u8`
#[derive(Debug, Clone)]
pub struct SimpleWriter {
    header: Vec<String>,
    round: u8,
    matrices: Vec<Matrix>,
    vectors: Vec<Vec<f64>>,
    path: String,
    queue: Vec<Queue>,
    to_write: HashMap<ToWriter, bool>,
}

impl SimpleWriter {
    pub fn new() -> SimpleWriter {
        let mut default_to_write: HashMap<ToWriter, bool> = HashMap::new();
        default_to_write.insert(Header, false);
        default_to_write.insert(Round, false);
        default_to_write.insert(Data, false);
        default_to_write.insert(Path, false);

        SimpleWriter {
            header: vec![],
            round: 0,
            matrices: vec![],
            vectors: vec![],
            path: "".to_string(),
            queue: vec![],
            to_write: default_to_write,
        }
    }

    pub fn insert_header(&mut self, head: Vec<&str>) -> &mut Self {
        if let Some(x) = self.to_write.get_mut(&Header) {
            *x = true
        }
        self.header = head
            .into_iter()
            .map(|t| t.to_owned())
            .collect::<Vec<String>>();
        self
    }

    pub fn set_round_level(&mut self, nth: u8) -> &mut Self {
        if let Some(x) = self.to_write.get_mut(&Round) {
            *x = true
        }
        self.round = nth;
        self
    }

    pub fn insert_matrix(&mut self, mat: Matrix) -> &mut Self {
        if let Some(x) = self.to_write.get_mut(&Data) {
            *x = true
        }
        self.matrices.push(mat);
        self.queue.push(Queue::Matrix);
        self
    }

    pub fn insert_vector(&mut self, vec: Vec<f64>) -> &mut Self {
        if let Some(x) = self.to_write.get_mut(&Data) {
            *x = true
        }
        self.vectors.push(vec);
        self.queue.push(Queue::Vector);
        self
    }

    pub fn set_path(&mut self, path: &str) -> &mut Self {
        if let Some(x) = self.to_write.get_mut(&Path) {
            *x = true
        }
        self.path = path.to_owned();
        self
    }

    pub fn write_csv(self) {
        unimplemented!()
    }

    pub fn write_pickle(&self) {
        let mut writer: Box<dyn Write>;

        // Error handling - Path
        if let Some(p) = self.to_write.get(&Path) {
            assert!(*p, "No determined path!");
        }

        // Error handling - Data
        if let Some(dat) = self.to_write.get(&Data) {
            assert!(*dat, "No inserted data!");
        }

        match File::create(self.path.clone()) {
            Ok(p) => writer = Box::new(p),
            Err(e) => {
                println!("{:?}", e);
                exit(1);
            }
        }

        if let Some(head) = self.to_write.get(&Header) {
            if *head {
                serde_pickle::to_writer(&mut writer, &self.header, true)
                    .expect("Can't write header to pickle");
            }
        }

        let mut queued = self.queue.clone().into_iter();
        let mut matrices = self.matrices.clone().into_iter();
        let mut vectors = self.vectors.clone().into_iter();

        loop {
            match queued.next() {
                Some(Queue::Matrix) => {
                    let mat = matrices.next().unwrap();
                    mat.write_pickle(&mut writer)
                        .expect("Can't insert matrices");
                }
                Some(Queue::Vector) => {
                    let vec = vectors.next().unwrap();
                    vec.write_pickle(&mut writer).expect("Can't insert vectors");
                }
                None => return,
            }
        }
    }
}