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use std::collections::HashMap;

use ::abc;
pub use ::types::abc::{Args, EntityId, Type, BType, ex};
pub use ::types::context::{Context};
pub use ::template::Template;
use ::loader::GroupLoader;

#[derive(Debug)]
pub struct Incrust<'a> {
    pub loaders: GroupLoader,
    filters: HashMap<String, Box<abc::Filter>>,
    top_context: HashMap<String, Box<Type + 'a>>,
}


impl <'a> Default for Incrust<'a> {
    fn default() -> Self {
        #![cfg_attr(feature = "clippy", allow(used_underscore_binding))]
        use ::renderer::filter::{Escape, Unescape};

        let mut filters: HashMap<String, Box<abc::Filter>> = HashMap::new();

        filters.insert("e".into(), box Escape);
        filters.insert("escape".into(), box Escape);
        filters.insert("unescape".into(), box Unescape);

        let env = hashmap!{
            "True".into()  => ex(true),
            "true".into()  => ex(true),
            "False".into() => ex(false),
            "false".into() => ex(false),
        };

        Incrust {
            loaders: Vec::new(),
            filters: filters,
            top_context: env,
        }
    }
}

impl <'aa> Incrust<'aa> {
    pub fn new() -> Self { Incrust::default() }

    pub fn no_default() -> Self {
        Incrust {
            loaders: Vec::new(),
            filters: HashMap::new(),
            top_context: HashMap::new(),
        }
    }

    pub fn context<'a>(&'a self, args: &'a Args<'a>) -> Context<'a> {
        Context::new(self, args)
    }

    pub fn top_context(&self) -> &HashMap<String, BType> {
        &self.top_context
    }

    pub fn load(&self, name: &str) -> abc::LoadResult {
        for loader in &self.loaders {
            if let Ok(template) = loader.load(name) { return Ok(template) }
        }
        Err(abc::LoadError::NotFound)
    }

    pub fn filter(&self, id: &str, value: Option<String>, context: &Context) -> abc::FilterResult {
        match self.filters.get(id) {
            Some(ref filter) => filter.filter(value, context),
            None => Err(abc::FilterError::UnknownFormatter(id.into()))
        }
    }

    #[cfg_attr(feature = "clippy", allow(let_and_return))]
    pub fn parse(&self, template: &str) -> abc::ParseResult {
        let template = Template::parse(template)?;
        Ok(template)
    }

    pub fn render<'a, C:Into<Args<'a>>>(&'a self, name: &str, args: C) -> abc::RenderResult<String> {
        let template = self.load(name)?;
        self.render_text(&template, args)
    }

    pub fn render_text<'a, C:Into<Args<'a>>>(&'a self, text: &str, args: C) -> abc::RenderResult<String> {
        let template = self.parse(text)?;
        self.render_parsed(&template, args)
    }

    pub fn render_parsed<'a, C:Into<Args<'a>>>(&'a self, template: &Template, args: C) -> abc::RenderResult<String> {
        self.render_prepared(template, &self.context(&args.into()))
    }

    pub fn render_prepared(&self, template: &Template, context: &Context) -> abc::RenderResult<String> {
        ::renderer::text(context, template.parsed.as_slice())
    }
}


#[cfg(test)]
mod tests {
    #![cfg_attr(feature = "clippy", allow(used_underscore_binding))]
    use super::*;

    #[test]
    fn text() {
        let templ = "Hello, World!";
        let expected = "Hello, World!";
        let incrust = Incrust::new();
        let result = incrust.render_text(templ, hashmap!{}).unwrap();
        assert_eq!(result, expected);
    }

    #[test]
    fn comments() {
        let incrust = Incrust::new();
        let templ = incrust.parse("<p>Visible {# partially #} paragraph</p>").unwrap();
        let expected = "<p>Visible  paragraph</p>";
        let result = incrust.render_parsed(&templ, hashmap!{}).unwrap();
        assert_eq!(result, expected);
    }

    #[test]
    fn mustache() {
        let templ = "Hello, {{name}}!";
        let expected = "Hello, World!";
        let incrust = Incrust::new();
        let result = incrust.render_text(templ, hashmap!{ "name".into() => ex("World") }).unwrap();
        assert_eq!(result, expected);
    }

    #[test]
    fn filter() {
        let templ = "<textarea>{{ html | e }}</textarea>";
        let args: Args = hashmap!{ "html".into() => ex("<h1>Hello, World!</h1>") };
        let expected = "<textarea>&lt;h1&gt;Hello, World&#33;&lt;/h1&gt;</textarea>";
        let incrust = Incrust::new();
        let result = incrust.render_text(templ, args).unwrap();
        assert_eq!(result, expected);
    }

    #[test]
    fn literal() {
        let incrust = Incrust::new();
        assert_eq!("Braces: {{", incrust.render_text(r#"Braces: {{ "{{" }}"#, hashmap!{}).unwrap());
        assert_eq!("The answer: 42", incrust.render_text(r#"The answer: {{ 42 }}"#, hashmap!{}).unwrap());
        assert_eq!("Pi: 3.1415926", incrust.render_text(r#"Pi: {{ 3.1415926 }}"#, hashmap!{}).unwrap());
    }

    #[test]
    fn expression() {
        let incrust = Incrust::new();
        let args = hashmap!{
            "what".into() => ex("Hello"),
            "who".into() => ex("World")
        };
        assert_eq!(r#"Say: "Hello, World!""#, incrust.render_text(r#"Say: "{{ what + ", " + who }}!""#, args).unwrap());
        let args = hashmap!{
            "alpha".into() => ex(6_i64),
            "omega".into() => ex(7_f64)
        };
        assert_eq!("The answer is 42", incrust.render_text(r#"The answer is {{ alpha * omega }}"#, args).unwrap());

        let args = hashmap!{ "amount".into() => ex(6_i64) };
        assert_eq!("Amount: 6 pcs", incrust.render_text(r#"Amount: {{ amount and ("" + amount + " pcs") or "-" }}"#, args).unwrap());

        let args = hashmap!{ "amount".into() => ex(0_i64) };
        assert_eq!("Amount: -", incrust.render_text(r#"Amount: {{ amount and ("" + amount + " pcs") or "-" }}"#, args).unwrap());
    }

    #[test]
    fn if_statement() {
        let incrust = Incrust::new();
        let test = |expected, template| assert_eq!(expected, incrust.render_text(template, hashmap!{}).unwrap());
        test("Mode: on",        r#"Mode: {% if True %}on{% endif %}"#);
        test("String is empty", r#"String {% if "" %}has chars{% else %}is empty{% endif %}"#);
        test("String is true",  r#"String {% if "" %}has chars{% elif True %}is true{% else %}is empty{% endif %}"#);
    }

    #[test]
    fn for_statement() {
        let incrust = Incrust::new();
        let args = hashmap!{ "fruits".into() => ex(vec![ex("Orange"), ex("Apple"), ex("Banana")]) };
        let tpl = r#"<ul>{% for fruit in fruits %}<li>{{ index }}. {{ fruit | e }}</li>{% endfor %}</ul>"#;
        let expected = r#"<ul><li>1. Orange</li><li>2. Apple</li><li>3. Banana</li></ul>"#;
        assert_eq!(expected, incrust.render_text(tpl, args).unwrap());
    }
}