#[macro_use]
extern crate log;

pub mod modelica_parser;
pub mod modelica_ast;

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

#[derive(Debug, PartialEq)]
pub struct ModelMetadata {
    pub slug: String,
    pub name_en: String,
    pub description_en: Option<String>,
    pub vars: Vec<ModelVar>,
}

#[derive(Debug, PartialEq)]
pub enum ModelVarType {
    Independent,
    Dependent,
    Constant,
}

#[derive(Debug, PartialEq)]
pub struct ModelVar {
    pub slug: String,
    pub name_en: String,
    pub vtype: Option<ModelVarType>,
    pub latex: Option<String>,
    pub units_si: Option<String>,
}

#[derive(Debug, PartialEq)]
pub struct ModelEntry {
    pub ast: modelica_ast::ModelicaModel,
    pub metadata: ModelMetadata,
    pub markdown: String,
}

// TODO: this
pub fn parse_metadata(s: String) -> Result<ModelMetadata,String> {
    Ok(ModelMetadata {
        slug: "dummy".to_string(),
        name_en: "Bogus Dummy Model".to_string(),
        description_en: None,
        vars: vec![],
    })
}

pub fn load_model_entry(p: &Path) -> Result<ModelEntry,String> {
    debug!("Attempting to load model from: {:?}", p);

    let ast = {
        let mut s = String::new();
        try!(File::open(p.join("model.modelica")).and_then(|mut f| f.read_to_string(&mut s)).map_err(|e| e.to_string()));
        try!(modelica_parser::parse_model(&s).map_err(|e| format!("{:?}", e)))
    };

    let metadata = {
        let mut s = String::new();
        try!(File::open(p.join("metadata.toml")).and_then(|mut f| f.read_to_string(&mut s)).map_err(|e| e.to_string()));
        parse_metadata(s).unwrap()
    };

    let markdown = {
        let mut s = String::new();
        try!(File::open(p.join("page.md")).and_then(|mut f| f.read_to_string(&mut s)).map_err(|e| e.to_string()));
        s
    };

    Ok(ModelEntry {
        ast: ast,
        metadata: metadata,
        markdown: markdown,
    })
}

// TODO: have this check for model.modelica etc
pub fn search_models(p: &Path) -> Vec<String> {
    if fs::metadata(p).unwrap().is_dir() {
        fs::read_dir(p).unwrap()
                       .map(|x| x.unwrap())
                       .filter(|x| x.metadata().unwrap().is_dir())
                       .map(|x| x.path().to_string_lossy().to_string())
                       .collect()
    } else {
        vec![]
    }
}

/* ******************************** Tests ******************************* */

#[test]
fn test_parse_metadata() {
    assert_eq!(parse_metadata("asdf".to_string()).unwrap(),
        ModelMetadata {
            slug: "dummy".to_string(),
            name_en: "Bogus Dummy Model".to_string(),
            description_en: None,
            vars: vec![],
        });
}

#[test]
fn test_load_model_entry() {
    load_model_entry(Path::new("./examples/classic_gravitation/")).unwrap();
}

#[test]
fn test_search_models() {
    assert_eq!(search_models(Path::new("./examples/")).len() > 1, true);
}

#[test]
fn test_lexical() {
    assert_eq!(&format!("{:?}", modelica_parser::parse_integer("+123").unwrap()),
               "123");
    assert_eq!(&format!("{:?}", modelica_parser::parse_integer("-9").unwrap()),
               "-9");
    assert_eq!(&format!("{:?}", modelica_parser::parse_float("-1.0e0").unwrap()),
               "-1");
    assert_eq!(&format!("{:?}", modelica_parser::parse_float("123.456").unwrap()),
               "123.456");
}

#[test]
fn test_parse() {
    let example1 =
r#"model MinimalModel
  Real x;
equation
  x = 1;
end MinimalModel;
"#;
    assert_eq!(&format!("{:?}", modelica_parser::parse_model(example1).unwrap()), example1);

    let example2 =
r#"model MinimalModel
  parameter Real a;
  Real b;
equation
  connect(a, b);
  a = 1;
  b = ((abs(a) + 2) / 4);
end MinimalModel;
"#;
    assert_eq!(&format!("{:?}", modelica_parser::parse_model(example2).unwrap()), example2);
}