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//! json adapter module

use crate::{Format, Markdown};

use super::{Adapter, AdapterObject};

/// JsonAdapter
///
/// transform markdown frontMatter into json
#[derive(Default, Debug)]
pub struct JsonAdapter();

impl Adapter for JsonAdapter {
    fn adapt<T>(&self, mut md: Markdown) -> crate::MarkdownResult
    where
        T: AdapterObject,
    {
        let fm = md.front_matter();

        match md.format() {
            Format::YAML => {
                let data = serde_yaml::from_str::<T>(&fm)?;
                let mut front_matter = serde_json::to_string_pretty(&data)?;

                if front_matter.ends_with("\n") {
                    front_matter.pop();
                }
                md.set_front_matter(front_matter);
                md.set_format(Format::JSON);
                Ok(md)
            }
            Format::TOML => {
                let data = toml::from_str::<T>(&fm)?;
                let mut front_matter = serde_json::to_string_pretty(&data)?;

                if front_matter.ends_with("\n") {
                    front_matter.pop();
                }
                md.set_front_matter(front_matter);
                md.set_format(Format::JSON);
                Ok(md)
            }
            Format::JSON => Ok(md),
        }
    }
}