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//! yaml adapter module

use crate::{Format, Markdown};

use super::{Adapter, AdapterObject};

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

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

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

                if front_matter.starts_with("---\n") {
                    front_matter = front_matter[4..].to_string();
                }

                if front_matter.ends_with("\n") {
                    front_matter.pop();
                }

                md.set_front_matter(front_matter);
                md.set_format(Format::YAML);
                Ok(md)
            }
            Format::TOML => {
                let data = toml::from_str::<T>(&fm)?;
                let mut front_matter = serde_yaml::to_string(&data)?;

                if front_matter.starts_with("---\n") {
                    front_matter = front_matter[4..].to_string();
                }

                if front_matter.ends_with("\n") {
                    front_matter.pop();
                }

                md.set_front_matter(front_matter);
                md.set_format(Format::YAML);
                Ok(md)
            }
            Format::YAML => Ok(md),
        }
    }
}