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// Copyright (c) 2022-2023 Yegor Bugayenko
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

use crate::Sodg;
use anyhow::Result;
use itertools::Itertools;
use xml_builder::{XMLBuilder, XMLElement, XMLVersion};

impl Sodg {
    /// Make XML graph.
    ///
    /// For example, for this code:
    ///
    /// ```
    /// use sodg::Hex;
    /// use sodg::Sodg;
    /// let mut g = Sodg::empty();
    /// g.add(0).unwrap();
    /// g.put(0, &Hex::from_str_bytes("hello")).unwrap();
    /// g.add(1).unwrap();
    /// g.bind(0, 1, "foo").unwrap();
    /// g.bind(0, 1, "bar").unwrap();
    /// let xml = g.to_xml().unwrap();
    /// println!("{}", xml);
    /// ```
    ///
    /// The printout will look like this:
    ///
    /// ```xml
    /// <?xml version="1.1" encoding="UTF-8"?>
    /// <sodg>
    ///     <v id="0">
    ///         <e a="foo" to="1" />
    ///         <e a="bar" to="1" />
    ///         <data>68 65 6C 6C 6F</data>
    ///     </v>
    ///     <v id="1" />
    /// </sodg>
    /// ```
    ///
    /// # Errors
    ///
    /// If it's impossible to print it to XML, an [`Err`] may be returned. Problems may also
    /// be caused by XML errors from the XML builder library.
    pub fn to_xml(&self) -> Result<String> {
        let mut xml = XMLBuilder::new()
            .version(XMLVersion::XML1_1)
            .encoding("UTF-8".into())
            .build();
        let mut root = XMLElement::new("sodg");
        for (v, vtx) in self
            .vertices
            .iter()
            .sorted_by_key(|(v, _)| <&u32>::clone(v))
        {
            let mut v_node = XMLElement::new("v");
            v_node.add_attribute("id", v.to_string().as_str());
            for e in vtx.edges.iter().sorted_by_key(|e| e.a.clone()) {
                let mut e_node = XMLElement::new("e");
                e_node.add_attribute("a", e.a.as_str());
                e_node.add_attribute("to", e.to.to_string().as_str());
                v_node.add_child(e_node)?;
            }
            if !vtx.data.is_empty() {
                let mut data_node = XMLElement::new("data");
                data_node.add_text(vtx.data.print().replace('-', " "))?;
                v_node.add_child(data_node)?;
            }
            root.add_child(v_node)?;
        }
        xml.set_root_element(root);
        let mut writer: Vec<u8> = Vec::new();
        xml.generate(&mut writer)?;
        Ok(std::str::from_utf8(&writer)?.to_string())
    }
}

#[cfg(test)]
use sxd_xpath::evaluate_xpath;

#[cfg(test)]
use crate::Hex;

#[test]
fn prints_simple_graph() -> Result<()> {
    let mut g = Sodg::empty();
    g.add(0)?;
    g.put(0, &Hex::from_str_bytes("hello"))?;
    g.add(1)?;
    g.bind(0, 1, "foo")?;
    let xml = g.to_xml()?;
    let parser = sxd_document::parser::parse(xml.as_str())?;
    let doc = parser.as_document();
    assert_eq!(
        "foo",
        evaluate_xpath(&doc, "/sodg/v[@id=0]/e[1]/@a")?.string()
    );
    assert_eq!(
        "68 65 6C 6C 6F",
        evaluate_xpath(&doc, "/sodg/v[@id=0]/data")?.string()
    );
    Ok(())
}