#import "/src/cetz.typ": styles

#import "/src/consts.typ": *
#import "/src/core/utils.typ": get-ctx, set-ctx

#let render(evt) = get-ctx(ctx => {
  let style = styles.resolve(
    ctx.style,
    merge: evt.style,
    root: "event",
    base: ()
  )

  let par-name = evt.participant
  let i = ctx.pars-i.at(par-name)
  let par = ctx.participants.at(i)
  let line = ctx.lifelines.at(i)
  let entry = (type: evt.event, y: ctx.y, style: style)

  if evt.event == "disable" {
    line.level -= 1
  } else if evt.event == "enable" {
    line.level += 1
  } else if evt.event == "create" {
    ctx.y -= CREATE-OFFSET
    entry.y = ctx.y
    (par.draw)(par, y: ctx.y)
  } else if evt.event == "destroy" {
  } else {
    panic("Unknown event '" + evt.event + "'")
  }

  line.events.push(entry)
  set-ctx(c => {
    c.lifelines.at(i) = line
    c.y = ctx.y
    return c
  })
})