use anyhow::anyhow;
use std::io::Read;
use std::path::Path;
use std::process::Command;

use anyhow::Result;

use super::Previewable;

pub struct AudioPath<'a>(pub &'a Path);

const COLOR: &str = "#dc322f"; // solarized red

impl<'a> Previewable for AudioPath<'a> {
    fn get_thumbnail(&self) -> Result<Option<Vec<u8>>> {
        let outfile = tempfile::Builder::new().suffix(".webp").tempfile()?;
        let thumbnail_cmd = Command::new("ffmpeg")
            .args(["-i", &self.0.to_string_lossy()])
            .args([
                "-filter_complex",
                &format!(
                    "[0:a]aformat=channel_layouts=mono, compand=gain=-2,
                     showwavespic=s=860x256:colors={COLOR},
                     drawbox=x=(iw-w)/2:y=(ih-h)/2:w=iw:h=1:color={COLOR}"
                ),
            ])
            .args(["-vframes", "1"])
            .arg(&*outfile.path().to_string_lossy())
            .arg("-y")
            .output()?;

        if !thumbnail_cmd.status.success() {
            return Err(anyhow!(
                "Failed to render thumbnail: {:?}",
                String::from_utf8_lossy(&thumbnail_cmd.stderr)
            ));
        }

        let mut buffer = Vec::new();
        outfile.as_file().read_to_end(&mut buffer)?;
        Ok(Some(buffer))
    }
}