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use range::Range;
use read_token::{ NumberSettings, ReadToken };
use std::sync::Arc;

use super::{
    ParseResult,
};
use {
    DebugId,
    MetaData,
    ParseError,
};
use tokenizer::{ read_data, TokenizerState };

/// Contains information about number.
#[derive(Clone, Debug, PartialEq)]
pub struct Number {
    /// The property to set.
    pub property: Option<Arc<String>>,
    /// A debug id to track down the rule generating an error.
    pub debug_id: DebugId,
    /// Whether underscore is allowed as visible separator.
    pub allow_underscore: bool,
}

impl Number {
    /// Parses number.
    pub fn parse(
        &self,
        tokens: &mut Vec<Range<MetaData>>,
        state: &TokenizerState,
        read_token: &ReadToken
    ) -> ParseResult<TokenizerState> {
        let settings = NumberSettings {
            allow_underscore: self.allow_underscore
        };
        if let Some(range) = read_token.number(&settings) {
            match read_token.parse_number(&settings, range.length) {
                Err(err) => {
                    Err(range.wrap(
                    ParseError::ParseNumberError(err, self.debug_id)))
                }
                Ok(val) => {
                    if let Some(ref property) = self.property {
                        Ok((range, read_data(
                            tokens,
                            range.wrap(MetaData::F64(property.clone(), val)),
                            state
                        ), None))
                    } else {
                        Ok((range, state.clone(), None))
                    }
                }
            }
        } else {
            return Err(read_token.start().wrap(
                ParseError::ExpectedNumber(self.debug_id)))
        }
    }
}

#[cfg(test)]
mod tests {
    use all::*;
    use all::tokenizer::*;
    use meta_rules::{ Number };
    use range::Range;
    use read_token::ReadToken;
    use std::sync::Arc;

    #[test]
    fn expected_number() {
        let text = "foo";
        let number = Number {
            debug_id: 0,
            property: None,
            allow_underscore: false,
        };
        let mut tokenizer = vec![];
        let s = TokenizerState::new();
        let res = number.parse(&mut tokenizer, &s, &ReadToken::new(&text, 0));
        assert_eq!(res, Err(Range::new(0, 0).wrap(
            ParseError::ExpectedNumber(0))));
    }

    #[test]
    fn successful() {
        let text = "foo 1 1.1 10e1 10.0E1 10_000";
        let number = Number {
            debug_id: 0,
            property: None,
            allow_underscore: true,
        };
        let mut tokens = vec![];
        let s = TokenizerState::new();
        let res = number.parse(&mut tokens, &s,
            &ReadToken::new(&text[4..], 4));
        assert_eq!(res, Ok((Range::new(4, 1), s, None)));
        let res = number.parse(&mut tokens, &s,
            &ReadToken::new(&text[6..], 6));
        assert_eq!(res, Ok((Range::new(6, 3), s, None)));
        let res = number.parse(&mut tokens, &s,
            &ReadToken::new(&text[10..], 10));
        assert_eq!(res, Ok((Range::new(10, 4), s, None)));
        let res = number.parse(&mut tokens, &s,
            &ReadToken::new(&text[22..], 22));
        assert_eq!(res, Ok((Range::new(22, 6), s, None)));

        let val: Arc<String> = Arc::new("val".into());
        let number = Number {
            debug_id: 0,
            property: Some(val.clone()),
            allow_underscore: false,
        };
        let res = number.parse(&mut tokens, &s,
            &ReadToken::new(&text[15..], 15));
        assert_eq!(res, Ok((Range::new(15, 6), TokenizerState(1), None)));
        assert_eq!(tokens.len(), 1);
        assert_eq!(&tokens[0].data, &MetaData::F64(val.clone(), 10.0e1));
    }
}