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

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

#[derive(Debug, Clone, PartialEq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Header {
    pub children: Vec<HeaderChild>,
}

impl Header {
    pub fn new() -> Header {
        Default::default()
    }

    pub fn add_paragraph(mut self, p: Paragraph) -> Self {
        // TODO: support numberings
        // if p.has_numbering {
        //     self.has_numbering = true
        // }
        self.children.push(HeaderChild::Paragraph(p));
        self
    }

    pub fn add_table(mut self, t: Table) -> Self {
        // TODO: support numberings
        // if t.has_numbering {
        //     self.has_numbering = true
        // }
        self.children.push(HeaderChild::Table(t));
        self
    }
}

impl Default for Header {
    fn default() -> Self {
        Self { children: vec![] }
    }
}

#[derive(Debug, Clone, PartialEq)]
pub enum HeaderChild {
    Paragraph(Paragraph),
    Table(Table),
}

impl Serialize for HeaderChild {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match *self {
            HeaderChild::Paragraph(ref p) => {
                let mut t = serializer.serialize_struct("Paragraph", 2)?;
                t.serialize_field("type", "paragraph")?;
                t.serialize_field("data", p)?;
                t.end()
            }
            HeaderChild::Table(ref c) => {
                let mut t = serializer.serialize_struct("Table", 2)?;
                t.serialize_field("type", "table")?;
                t.serialize_field("data", c)?;
                t.end()
            }
        }
    }
}

impl BuildXML for Header {
    fn build(&self) -> Vec<u8> {
        let mut b = XMLBuilder::new();
        b = b.declaration(Some(true)).open_header();

        for c in &self.children {
            match c {
                HeaderChild::Paragraph(p) => b = b.add_child(p),
                HeaderChild::Table(t) => b = b.add_child(t),
            }
        }
        b.close().build()
    }
}

#[cfg(test)]
mod tests {

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

    #[test]
    fn test_settings() {
        let c = Header::new();
        let b = c.build();
        assert_eq!(
            str::from_utf8(&b).unwrap(),
            r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<w:hdr xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main" xmlns:w10="urn:schemas-microsoft-com:office:word" xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing" xmlns:wps="http://schemas.microsoft.com/office/word/2010/wordprocessingShape" xmlns:wpg="http://schemas.microsoft.com/office/word/2010/wordprocessingGroup" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:wp14="http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing" xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml" mc:Ignorable="w14 wp14" />"#
        );
    }
}