use crate::error::Error;
use crate::pes::pec::{decode_stitches, parse_pec_header};
use crate::types::{ResolvedDesign, StitchCommand};

/// Parse a standalone PEC file (`#PEC0001` prefix + PEC data).
pub fn parse(data: &[u8]) -> Result<(Vec<StitchCommand>, Vec<(u8, u8, u8)>), Error> {
    if data.len() < 8 || &data[0..8] != b"#PEC0001" {
        return Err(Error::InvalidHeader("missing #PEC0001 magic".into()));
    }

    let pec_data = &data[8..];
    let (header, stitch_offset) = parse_pec_header(pec_data)?;
    let commands = decode_stitches(&pec_data[stitch_offset..])?;

    // Map PEC palette indices to RGB colors
    let colors: Vec<(u8, u8, u8)> = header
        .color_indices
        .iter()
        .map(|&idx| crate::palette::pec_color(idx))
        .collect();

    Ok((commands, colors))
}

/// Parse a standalone PEC file and resolve to a renderable design.
pub fn parse_and_resolve(data: &[u8]) -> Result<ResolvedDesign, Error> {
    let (commands, colors) = parse(data)?;
    crate::resolve::resolve(&commands, colors)
}