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use super::copy::Copy;
use super::vault::Vault;
use anyhow::{anyhow, Context, Result};

enum ParseableType {
    Copyable(Copy),
    Vaultable(Vault),
    None(serde_json::Value),
}

impl ParseableType {
    fn get_value(&self) -> Result<serde_json::Value> {
        match self {
            ParseableType::Copyable(v) => v.get_value(),
            ParseableType::Vaultable(v) => v.get_value(),
            ParseableType::None(v) => Ok(v.to_owned()),
        }
    }
}
impl TryFrom<serde_json::Map<std::string::String, serde_json::Value>> for ParseableType {
    type Error = anyhow::Error;
    fn try_from(
        value: serde_json::Map<std::string::String, serde_json::Value>,
    ) -> std::result::Result<Self, Self::Error> {
        match value {
            v if v.contains_key("@copy") => {
                return Ok(ParseableType::Copyable(v.get("@copy").unwrap().try_into()?));
            }
            v if v.contains_key("@vault") => {
                return Ok(ParseableType::Vaultable(
                    v.get("@vault").unwrap().try_into()?,
                ));
            }
            _ => {
                return Ok(ParseableType::None(serde_json::Value::Object(value)));
            }
        }
    }
}

impl TryFrom<serde_json::Value> for ParseableType {
    type Error = anyhow::Error;
    fn try_from(value: serde_json::Value) -> Result<Self> {
        match value {
            serde_json::Value::Object(v) => {
                return Ok(ParseableType::try_from(v)?);
            }
            _ => {
                return Ok(ParseableType::None(value));
            }
        }
    }
}

#[cfg(test)]
mod parse_tests {
    use crate::parse;

    fn test_transformation(input: &str, expect: &str) {
        let mut obj: serde_json::Value = serde_yaml::from_str(input).unwrap();
        let obj = parse::parse_value(obj).unwrap();

        let expect: serde_json::Value = serde_yaml::from_str(expect).unwrap();
        assert_eq!(obj, expect);
    }

    #[test]
    fn test_copy() {
        let input = r#"
            base:
              "@copy":
                value: a
        "#;
        let expect = r#"
            base: a
        "#;
        test_transformation(input, expect)
    }

    #[test]
    fn test_nested() {
        let input = r#"
            base:
              should-be-a:
                "@copy":
                  value: a
        "#;
        let expect = r#"
            base:
                should-be-a: a
        "#;

        test_transformation(input, expect)
    }

    #[test]
    fn test_array_parse() {
        let input = r#"
            base:
            - "@copy":
                value: a
            - "@copy":
                value: b
        "#;
        let expect = r#"
            base:
            - a
            - b
        "#;
        test_transformation(input, expect)
    }

    #[test]
    fn test_nested_array() {
        let input = r#"
            base:
             - first_array:
               - "@copy":
                    value: a
               - value: b
             - second_array:
               - "@copy":
                   value: c
        "#;
        let expect = r#"
            base:
            - first_array:
              - a
              - value: b
            - second_array:
                - c  
        "#;
        test_transformation(input, expect)
    }

    #[test]
    fn test_copy_errors() {
        let mut obj: serde_json::Value =
            serde_json::from_str(r#"{ "base": { "@copy": "bob" } }"#).unwrap();
        assert!(parse::parse_value(obj).is_err());
    }
}

pub fn parse_value(input: serde_json::Value) -> Result<serde_json::Value> {
    match input {
        serde_json::Value::Array(a) => {
            let mut result: Vec<serde_json::Value> = vec![];
            for i in a {
                result.push(parse_value(i)?);
            }
            return Ok(result.into());
        }
        serde_json::Value::Object(o) => {
            match ParseableType::try_from(o.to_owned())? {
                ParseableType::None(o) => {
                    let o = o.as_object().unwrap(); // we konw this is an object because of the line above
                    let mut ret = serde_json::Map::new();
                    for (k, v) in o.iter() {
                        ret.insert(k.to_string(), parse_value(v.to_owned())?);
                    }
                    return Ok(ret.into());
                }
                _ => return Ok(ParseableType::try_from(o.to_owned())?.get_value()?),
            }
        }
        _ => return Ok(input),
    }
}