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use crate::Style::{COMPACT, PRETTY};
use core::fmt::Debug;
use std::io;
use thiserror::Error;

#[derive(Error, Debug)]
pub enum Yaml2JsonError {
    #[error(transparent)]
    SerdeYamlError(#[from] serde_yaml::Error),

    #[error(transparent)]
    SerdeJsonError(#[from] serde_json::Error),

    #[error(transparent)]
    IOError(#[from] std::io::Error),
}

pub enum Style {
    COMPACT,
    PRETTY,
}

pub struct Yaml2Json {
    style: Style,
}

impl Yaml2Json {
    pub fn new(style: Style) -> Self {
        Self { style }
    }

    pub fn document_to_string(&self, document: String) -> Result<String, Yaml2JsonError> {
        let s: serde_json::Value = serde_yaml::from_str(document.as_str())?;

        let res = match self.style {
            COMPACT => serde_json::to_string(&s),
            PRETTY => serde_json::to_string_pretty(&s),
        };

        match res {
            Ok(s) => Ok(s),
            Err(e) => Err(e.into()),
        }
    }

    pub fn document_to_writer<W: io::Write>(
        &self,
        document: String,
        w: &mut W,
    ) -> Result<(), Yaml2JsonError> {
        let s: serde_json::Value = serde_yaml::from_str(document.as_str())?;

        let res = match self.style {
            PRETTY => serde_json::to_writer_pretty(w, &s),
            COMPACT => serde_json::to_writer(w, &s),
        };

        match res {
            Ok(_) => Ok(()),
            Err(e) => Err(e.into()),
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::{Style, Yaml2Json};
    use std::io::Cursor;

    #[test]
    fn document_to_string_compact() {
        let yaml2json = Yaml2Json::new(Style::COMPACT);
        let input = String::new()
            + r#"
---
abc: def
"#;
        let expected = String::new() + r#"{"abc":"def"}"#;
        let res = yaml2json.document_to_string(input).unwrap();
        assert_eq!(expected, res);
    }

    #[test]
    fn document_to_string_pretty() {
        let yaml2json = Yaml2Json::new(Style::PRETTY);
        let input = String::new()
            + r#"
---
abc: def
"#;
        let expected = String::new()
            + r#"{
  "abc": "def"
}"#;
        let res = yaml2json.document_to_string(input).unwrap();
        assert_eq!(expected, res);
    }

    #[test]
    fn document_to_writer_compact() {
        let yaml2json = Yaml2Json::new(Style::COMPACT);
        let input = String::new()
            + r#"
---
abc: def
"#;
        let expected = String::new() + r#"{"abc":"def"}"#;

        let mut buf = Cursor::new(Vec::<u8>::new());
        yaml2json.document_to_writer(input, buf.get_mut()).unwrap();

        let res = String::from_utf8(buf.into_inner()).unwrap();
        assert_eq!(expected, res);
    }

    #[test]
    fn document_to_writer_pretty() {
        let yaml2json = Yaml2Json::new(Style::PRETTY);
        let input = String::new()
            + r#"
---
abc: def
"#;
        let expected = String::new()
            + r#"{
  "abc": "def"
}"#;

        let mut buf = Cursor::new(Vec::<u8>::new());
        yaml2json.document_to_writer(input, buf.get_mut()).unwrap();

        let res = String::from_utf8(buf.into_inner()).unwrap();
        assert_eq!(expected, res);
    }
}