import { Decision } from "@effect/core/io/Schedule/Decision"
import { Interval } from "@effect/core/io/Schedule/Interval"
import { makeWithState } from "@effect/core/io/Schedule/operations/_internal/makeWithState"
import {
  beginningOfMinute,
  endOfMinute,
  nextMinute
} from "@effect/core/io/Schedule/operations/_internal/time"

/**
 * Cron-like schedule that recurs every specified `minute` of each hour. It
 * triggers at zero second of the minute. Producing a count of repeats: 0, 1,
 * 2.
 *
 * NOTE: `minute` parameter is validated lazily. Must be in range 0...59.
 *
 * @tsplus static effect/core/io/Schedule.Ops minuteOfHour
 */
export function minuteOfHour(
  minute: number
): Schedule<readonly [number, number], never, unknown, number> {
  return makeWithState(
    [Number.MIN_SAFE_INTEGER, 0] as readonly [number, number],
    (now, _, state) => {
      if (!Number.isInteger(minute) || minute < 0 || 59 < minute) {
        return Effect.dieSync(
          new IllegalArgumentException(
            `Invalid argument in: minuteOfHour(${minute}). Must be in range 0...59`
          )
        )
      }
      const [end0, n] = state
      const now0 = Math.max(end0, now)
      const minute0 = nextMinute(Math.max(end0, now0), minute)
      const start = Math.max(beginningOfMinute(minute0), now0)
      const end = endOfMinute(minute0)
      const interval = Interval(start, end)
      return Effect.succeed([[end, n + 1], n, Decision.continueWith(interval)])
    }
  )
}