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use serde_json::{Value};
use std::collections;

use super::super::schema;
use super::super::validators;

pub type FormatBuilders = collections::HashMap<String, Box<super::Keyword + Send + Sync>>;

fn default_formats() -> FormatBuilders {
    let mut map: FormatBuilders = collections::HashMap::new();

    let date_time_builder = Box::new(|_def: &Value, _ctx: &schema::WalkContext| {
        Ok(Some(Box::new(validators::formats::DateTime) as validators::BoxedValidator))
    });
    map.insert("date-time".to_string(), date_time_builder);

    let email_builder = Box::new(|_def: &Value, _ctx: &schema::WalkContext| {
        Ok(Some(Box::new(validators::formats::Email) as validators::BoxedValidator))
    });
    map.insert("email".to_string(), email_builder);

    let hostname_builder = Box::new(|_def: &Value, _ctx: &schema::WalkContext| {
        Ok(Some(Box::new(validators::formats::Hostname) as validators::BoxedValidator))
    });
    map.insert("hostname".to_string(), hostname_builder);

    let ipv4_builder = Box::new(|_def: &Value, _ctx: &schema::WalkContext| {
        Ok(Some(Box::new(validators::formats::Ipv4) as validators::BoxedValidator))
    });
    map.insert("ipv4".to_string(), ipv4_builder);

    let ipv6_builder = Box::new(|_def: &Value, _ctx: &schema::WalkContext| {
        Ok(Some(Box::new(validators::formats::Ipv6) as validators::BoxedValidator))
    });
    map.insert("ipv6".to_string(), ipv6_builder);

    let uri_builder = Box::new(|_def: &Value, _ctx: &schema::WalkContext| {
        Ok(Some(Box::new(validators::formats::Uri) as validators::BoxedValidator))
    });
    map.insert("uri".to_string(), uri_builder);

    let uuid_builder = Box::new(|_def: &Value, _ctx: &schema::WalkContext| {
        Ok(Some(Box::new(validators::formats::Uuid) as validators::BoxedValidator))
    });
    map.insert("uuid".to_string(), uuid_builder);

    map
}

#[allow(missing_copy_implementations)]
pub struct Format {
    pub formats: FormatBuilders
}

impl Format {
    pub fn new() -> Format {
        Format {
            formats: default_formats()
        }
    }

    pub fn with<F>(build_formats: F) -> Format where F: FnOnce(&mut FormatBuilders) {
        let mut formats = default_formats();
        build_formats(&mut formats);
        Format {
            formats: formats
        }
    }
}

impl super::Keyword for Format {
    fn compile(&self, def: &Value, ctx: &schema::WalkContext) -> super::KeywordResult {
        let format = keyword_key_exists!(def, "format");

        if format.is_string() {
            let format = format.as_str().unwrap();
            match self.formats.get(format) {
                Some(keyword) => {
                    keyword.compile(def, ctx)
                },
                None => {
                    Ok(None)
                }
            }
        } else {
            Err(schema::SchemaError::Malformed {
                path: ctx.fragment.join("/"),
                detail: "The value of format MUST be a string".to_string()
            })
        }
    }
}

#[cfg(test)] use super::super::scope;
#[cfg(test)] use super::super::builder;
#[cfg(test)] use serde_json::to_value;

#[test]
fn validate_date_time() {
    let mut scope = scope::Scope::new();
    let schema = scope.compile_and_return(builder::schema(|s| {
        s.format("date-time");
    }).into_json(), true).ok().unwrap();

    assert_eq!(schema.validate(&to_value(&"2015-01-20T17:35:20-08:00").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"1944-06-06T04:04:00Z").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"Tue, 20 Jan 2015 17:35:20 -0800").unwrap()).is_valid(), false);
}

#[test]
fn validate_email() {
    let mut scope = scope::Scope::new();
    let schema = scope.compile_and_return(builder::schema(|s| {
        s.format("email");
    }).into_json(), true).ok().unwrap();

    assert_eq!(schema.validate(&to_value(&"ad@ress").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"add.ress+fd@domain.co.com").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"add:re").unwrap()).is_valid(), false);
}

#[test]
fn validate_hostname() {
    let mut scope = scope::Scope::new();
    let schema = scope.compile_and_return(builder::schema(|s| {
        s.format("hostname");
    }).into_json(), true).ok().unwrap();

    assert_eq!(schema.validate(&to_value(&"example").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"example.com").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"ex:ample").unwrap()).is_valid(), false);
}

#[test]
fn validate_ipv4() {
    let mut scope = scope::Scope::new();
    let schema = scope.compile_and_return(builder::schema(|s| {
        s.format("ipv4");
    }).into_json(), true).ok().unwrap();

    assert_eq!(schema.validate(&to_value(&"127.0.0.1").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"8.8.8.8").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"::::0.0.0.0").unwrap()).is_valid(), false);
}

#[test]
fn validate_ipv6() {
    let mut scope = scope::Scope::new();
    let schema = scope.compile_and_return(builder::schema(|s| {
        s.format("ipv6");
    }).into_json(), true).ok().unwrap();

    assert_eq!(schema.validate(&to_value(&"FE80:0000:0000:0000:0202:B3FF:FE1E:8329").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"127.0.0.1").unwrap()).is_valid(), false);
}

#[test]
fn validate_uri() {
    let mut scope = scope::Scope::new();
    let schema = scope.compile_and_return(builder::schema(|s| {
        s.format("uri");
    }).into_json(), true).ok().unwrap();

    assert_eq!(schema.validate(&to_value(&"http://example.com").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"some-wrong").unwrap()).is_valid(), false);
}

#[test]
fn validate_uuid() {
    let mut scope = scope::Scope::new();
    let schema = scope.compile_and_return(builder::schema(|s| {
        s.format("uuid");
    }).into_json(), true).ok().unwrap();

    assert_eq!(schema.validate(&to_value(&"2f5a2593-7481-49e2-9911-8fe2ad069aac").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"2f5a2593748149e299118fe2ad069aac").unwrap()).is_valid(), true);
    assert_eq!(schema.validate(&to_value(&"2f5a2593-7481-49e2-9911-8fe2ad06").unwrap()).is_valid(), false);
}