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use pug;

use crate::error::Result;
use crate::resume::{RawResume, Resume};

#[derive(Debug, Clone)]
pub struct HtmlCompiler;

impl HtmlCompiler {
    pub fn new() -> Self {
        Self
    }
}

impl HtmlCompiler {
    pub fn compile(&self, resume: &RawResume) -> Result<Resume> {
        let html = String::from_utf8(resume.html().to_vec())?;
        let css = String::from_utf8(resume.stylesheet().to_vec())?;

        let html = pug::parse(html)?;

        Ok(Resume::new(html, css))
    }
}

impl Default for HtmlCompiler {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use crate::error::ErrorKind;
    use crate::templates::BASIC;

    use super::*;

    const INVALID_UTF8: &[u8] = &[0, 159, 146, 150];

    #[test]
    fn compile_creates_resume_from_valid_template() {
        let template = &BASIC;
        let raw_resume = RawResume::new(template.html(), template.stylesheet());
        let compiler = HtmlCompiler::default();

        assert!(compiler.compile(&raw_resume).is_ok());
    }

    #[test]
    fn compile_fails_if_template_has_non_utf8_html() {
        let invalid_html = INVALID_UTF8;
        let valid_stylesheet = &BASIC.stylesheet();
        let template = RawResume::new(invalid_html, valid_stylesheet);
        let compiler = HtmlCompiler::default();

        let result = compiler.compile(&template);
        assert!(result.is_err());
        assert_eq!(result.unwrap_err().kind(), &ErrorKind::InvalidUtf8);
    }

    #[test]
    fn compile_fails_if_template_has_non_utf8_stylesheet() {
        let valid_html = &BASIC.html();
        let invalid_stylesheet = INVALID_UTF8;
        let raw_resume = RawResume::new(valid_html, invalid_stylesheet);
        let compiler = HtmlCompiler::default();

        let result = compiler.compile(&raw_resume);
        assert!(result.is_err());
        assert_eq!(result.unwrap_err().kind(), &ErrorKind::InvalidUtf8);
    }

    #[test]
    fn compile_fails_if_template_html_is_not_valid_pug() {
        let invalid_html = b"<html></html>";
        let valid_stylesheet = &BASIC.stylesheet();
        let raw_resume = RawResume::new(invalid_html, valid_stylesheet);
        let compiler = HtmlCompiler::default();

        let result = compiler.compile(&raw_resume);
        assert!(result.is_err());
        assert_eq!(result.unwrap_err().kind(), &ErrorKind::Pug);
    }
}