use crate::file::FileEnv;
use crate::prelude::*;

use super::Link;

pub fn add(link: &Link, file_name: &str, e: &FileEnv) -> Result<()> {
    (e.append_line)(file_name, &link.href)?;
    Ok(())
}

#[cfg(test)]
mod tests {

    use crate::{
        history::Link,
        test_utils::{create_text_file, read_text_file},
    };

    use super::*;

    #[test]
    fn creates_file_if_missing() -> Result<()> {
        //given
        let file_name = "download.txt";
        let dir = create_text_file(file_name, include_bytes!("../../test/data/empty.txt"))?;
        let path = format!("{}/{}", dir.path().to_string_lossy(), file_name);
        std::fs::remove_file(path)?;

        let link = Link {
            href: "foo".to_string(),
            rel: "bar".to_string(),
            hreflang: None,
            mime_type: None,
            title: None,
            length: None,
        };
        //when
        add(
            &link,
            file_name,
            &FileEnv::create(dir.path().to_string_lossy().to_string()),
        )?;

        //then
        let content: Vec<String> = read_text_file(dir.path(), file_name)?;
        drop(dir);

        let expected = vec!["foo".to_string()];
        assert_eq!(content, expected);

        Ok(())
    }

    #[test]
    fn appends_to_exising_file() -> Result<()> {
        // given
        let file_name = "download.txt";
        let dir = create_text_file(file_name, include_bytes!("../../test/data/downloads.txt"))?;

        let link = Link {
            href: "foo".to_string(),
            rel: "bar".to_string(),
            hreflang: None,
            mime_type: None,
            title: None,
            length: None,
        };
        //when
        add(
            &link,
            file_name,
            &FileEnv::create(dir.path().to_string_lossy().to_string()),
        )?;

        //then
        let content: Vec<String> = read_text_file(dir.path(), file_name)?;
        drop(dir);

        let expected = vec![
            "line-1".to_string(),
            "line-2".to_string(),
            "foo".to_string(),
        ];
        assert_eq!(content, expected);

        Ok(())
    }
}