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#![deny(missing_docs)]

//! The main crate for the Rustache library.
//!
//! Rustache is a flexible template engine for Rust.

extern crate rustc_serialize;

use std::fmt;
use std::cell::RefCell;
use std::collections::HashMap;
use std::convert::From;

use self::Data::*;

pub use build::{HashBuilder, VecBuilder};
pub use rustache::Render;

/// Alias for Result<T, `RustacheError`>
pub type RustacheResult<T> = Result<T, RustacheError>;

/// Enum to handle errors from the Rustache library.
#[derive(Debug)]
pub enum RustacheError {
    // ParserErrorType(ParserError),
    // CompilerErrorType(CompilerError),
    /// Error parsing JSON data
    JsonError(String),
    /// Error opening or reading a file
    FileError(String),
    /// Generic enum value for any errors from the template module.
    TemplateErrorType(template::TemplateError),
}

// Represents the possible types that passed in data may take on
#[doc(hidden)]
pub enum Data<'a> {
    Strng(String),
    Bool(bool),
    Integer(i32),
    Float(f64),
    Vector(Vec<Data<'a>>),
    Hash(HashMap<String, Data<'a>>),
    Lambda(RefCell<&'a mut FnMut(String) -> String>),
}

impl<'a, 'b> From<&'b str> for Data<'a> {
    fn from(v: &'b str) -> Data<'a> {
        Strng(v.to_owned())
    }
}

impl<'a> From<String> for Data<'a> {
    fn from(v: String) -> Data<'a> {
        Strng(v)
    }
}

impl<'a> From<bool> for Data<'a> {
    fn from(v: bool) -> Data<'a> {
        Bool(v)
    }
}

impl<'a> From<i32> for Data<'a> {
    fn from(v: i32) -> Data<'a> {
        Integer(v)
    }
}

impl<'a> From<f64> for Data<'a> {
    fn from(v: f64) -> Data<'a> {
        Float(v)
    }
}

impl<'a> From<Vec<Data<'a>>> for Data<'a> {
    fn from(v: Vec<Data<'a>>) -> Data<'a> {
        Vector(v)
    }
}

impl<'a> From<HashMap<String, Data<'a>>> for Data<'a> {
    fn from(v: HashMap<String, Data<'a>>) -> Data<'a> {
        Hash(v)
    }
}

impl<'a> From<&'a mut FnMut(String) -> String> for Data<'a> {
    fn from(v: &'a mut FnMut(String) -> String) -> Data<'a> {
        Lambda(RefCell::new(v))
    }
}

// |String|: 'a -> String : F Above

// Implementing custom PartialEq for Data
impl<'a> PartialEq for Data<'a> {
    fn eq(&self, other: &Data<'a>) -> bool {
        match (self, other) {
            (&Strng(ref val0), &Strng(ref val1)) => val0 == val1,
            (&Bool(ref val0), &Bool(ref val1)) => val0 == val1,
            (&Integer(ref val0), &Integer(ref val1)) => val0 == val1,
            (&Float(ref val0), &Float(ref val1)) => val0 == val1,
            (&Vector(ref val0), &Vector(ref val1)) => val0 == val1,
            (&Hash(ref val0), &Hash(ref val1)) => val0 == val1,
            (&Lambda(_), &Lambda(_)) => panic!("Can't compare closures"),
            (_, _) => false,
        }
    }
}

// Implementing custom Show for Data
impl<'a> fmt::Debug for Data<'a> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Strng(ref val) => write!(f, "Strng({:?})", val),
            Bool(val) => write!(f, "Boolean({:?})", val),
            Integer(ref val) => write!(f, "Integer({:?})", val),
            Float(ref val) => write!(f, "Float({:?})", val),
            Vector(ref val) => write!(f, "Vector({:?})", val),
            Hash(ref val) => write!(f, "Hash({:?})", val),
            Lambda(_) => write!(f, "Lambda(...)"),
        }
    }
}

// Internal Modules
mod rustache;
mod compiler;
mod parser;
mod build;
mod template;