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use crate::{
    closing_position::{closing_position, ClosingPosition},
    position::{position, Position},
};
use nom::{
    combinator::{map, opt},
    sequence::pair,
    IResult,
};

#[derive(Debug, PartialEq, Eq)]
pub struct PostingValue<'a> {
    pub value_position: Position<'a>,
    pub closing_position: Option<ClosingPosition<'a>>,
}

pub(crate) fn posting_value(i: &str) -> IResult<&str, PostingValue> {
    map(
        pair(position, opt(closing_position)),
        |(value_position, closing_position)| PostingValue {
            value_position,
            closing_position,
        },
    )(i)
}

#[test]
fn it_should_parse_posting_values_without_closing_position() {
    assert_eq!(
        posting_value("2.12"),
        Ok((
            "",
            PostingValue {
                value_position: Position {
                    amount: "2.12",
                    commodity: None
                },
                closing_position: None,
            }
        ))
    );

    assert_eq!(
        posting_value("123 EUR"),
        Ok((
            "",
            PostingValue {
                value_position: Position {
                    amount: "123",
                    commodity: Some("EUR")
                },
                closing_position: None,
            }
        ))
    );
}

#[test]
fn it_should_parse_posting_values_with_closing_position_unit_price() {
    use crate::closing_position::ClosingPositionType;

    assert_eq!(
        posting_value("123 EUR @ 1 SEK"),
        Ok((
            "",
            PostingValue {
                value_position: Position {
                    amount: "123",
                    commodity: Some("EUR")
                },
                closing_position: Some(ClosingPosition {
                    closing_position_type: ClosingPositionType::UnitPrice,
                    position: Position {
                        amount: "1",
                        commodity: Some("SEK")
                    }
                }),
            }
        ))
    );

    assert_eq!(
        posting_value("123 EUR @ 1"),
        Ok((
            "",
            PostingValue {
                value_position: Position {
                    amount: "123",
                    commodity: Some("EUR")
                },
                closing_position: Some(ClosingPosition {
                    closing_position_type: ClosingPositionType::UnitPrice,
                    position: Position {
                        amount: "1",
                        commodity: None
                    },
                }),
            }
        ))
    );
}

#[test]
fn it_should_parse_posting_values_with_closing_position_total_price() {
    use crate::closing_position::ClosingPositionType;
    assert_eq!(
        posting_value("123 EUR = 1 SEK"),
        Ok((
            "",
            PostingValue {
                value_position: Position {
                    amount: "123",
                    commodity: Some("EUR")
                },
                closing_position: Some(ClosingPosition {
                    closing_position_type: ClosingPositionType::TotalPrice,
                    position: Position {
                        amount: "1",
                        commodity: Some("SEK")
                    }
                }),
            }
        ))
    );

    assert_eq!(
        posting_value("123 EUR = 1"),
        Ok((
            "",
            PostingValue {
                value_position: Position {
                    amount: "123",
                    commodity: Some("EUR")
                },
                closing_position: Some(ClosingPosition {
                    closing_position_type: ClosingPositionType::TotalPrice,
                    position: Position {
                        amount: "1",
                        commodity: None
                    },
                }),
            }
        ))
    );
}