module img

import benchmark
import sim

pub fn image_worker(mut writer PPMWriter, result_chan chan &sim.SimResult, settings ImageSettings) {
    width := settings.width
    height := settings.height
    total_pixels := width * height

    // as new pixels come in, write them to the image file
    mut current_index := u64(0)
    mut pixel_buf := []ValidColor{len: total_pixels, init: ValidColor{
        valid: false
    }}

    mut bmark := benchmark.new_benchmark()
    for {
        result := <-result_chan or { break }

        // find the closest magnet
        pixel_buf[result.id].Color = compute_pixel(result)
        pixel_buf[result.id].valid = true

        for current_index < total_pixels && pixel_buf[current_index].valid {
            bmark.step()
            writer.handle_pixel(pixel_buf[current_index].Color) or {
                bmark.fail()
                sim.log(@MOD + '.' + @FN + ': pixel handler failed. Error ${err}')
                break
            }
            bmark.ok()
            current_index++
        }
    }
    bmark.stop()
    println(bmark.total_message(@FN))

    writer.write() or { panic('Could not write image') }
}