use serde::ser::{SerializeStruct, Serializer};
use serde::Serialize;

use crate::documents::BuildXML;
use crate::types::*;
use crate::xml_builder::*;

#[derive(Debug, Clone, PartialEq)]
pub struct Indent {
    start: Option<i32>,
    end: Option<i32>,
    special_indent: Option<SpecialIndentType>,
    start_chars: Option<i32>,
}

impl Indent {
    pub fn new(
        start: Option<i32>,
        special_indent: Option<SpecialIndentType>,
        end: Option<i32>,
        start_chars: Option<i32>,
    ) -> Indent {
        Indent {
            start,
            start_chars,
            end,
            special_indent,
        }
    }

    pub fn end(mut self, end: i32) -> Self {
        self.end = Some(end);
        self
    }
}

impl BuildXML for Indent {
    fn build(&self) -> Vec<u8> {
        XMLBuilder::new()
            .indent(
                self.start,
                self.special_indent,
                self.end.unwrap_or_default(),
                self.start_chars,
            )
            .build()
    }
}

impl Serialize for Indent {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut t = serializer.serialize_struct("Indent", 3)?;
        t.serialize_field("start", &self.start)?;
        t.serialize_field("startChars", &self.start_chars)?;
        t.serialize_field("end", &self.end)?;
        t.serialize_field("specialIndent", &self.special_indent)?;
        t.end()
    }
}

#[cfg(test)]
mod tests {

    use super::*;
    #[cfg(test)]
    use pretty_assertions::assert_eq;
    use std::str;

    #[test]
    fn test_left() {
        let b = Indent::new(Some(20), None, None, None).build();
        assert_eq!(
            str::from_utf8(&b).unwrap(),
            r#"<w:ind w:left="20" w:right="0" />"#
        );
    }

    #[test]
    fn test_first_line() {
        let b = Indent::new(Some(20), Some(SpecialIndentType::FirstLine(40)), None, None).build();
        assert_eq!(
            str::from_utf8(&b).unwrap(),
            r#"<w:ind w:left="20" w:right="0" w:firstLine="40" />"#
        );
    }

    #[test]
    fn test_hanging() {
        let b = Indent::new(Some(20), Some(SpecialIndentType::Hanging(50)), None, None).build();
        assert_eq!(
            str::from_utf8(&b).unwrap(),
            r#"<w:ind w:left="20" w:right="0" w:hanging="50" />"#
        );
    }
}