import docopt, os, nre, sequtils, strutils, times, timeutils

type ParseState = enum BeforeHeading, ReadingPlans, AfterPlans

type PlanItem* = tuple[time: TimeInfo, note: string]

proc parseDailyPlan(filename: string): seq[PlanItem] =

  var planItems: seq[PlanItem] = @[]
  var parseState = BeforeHeading
  let planItemRe = re"\s*(\d{4})\s+(.*)"
  let timeFmt = "HHmm"

  for line in lines filename:
    case parseState

    of BeforeHeading:
      if line.strip.startsWith("# Timeline"): parseState = ReadingPlans

    of ReadingPlans:
      let match = line.find(planItemRe)
      if match.isSome(): planItems.add((
        time: parse(match.get().captures[0], timeFmt),
        note: match.get().captures[1]))
      else: parseState = AfterPlans

    of AfterPlans: break
    else: break

  return planItems

when isMainModule:

  let doc = """
Usage:
  daily_notifier [options]

Options:

  -d --plan-directory <dir>     Directory to search for plan files.

  -f --plan-date-format <fmt>   Date pattern for identifying plan files. This
                                is used in conjunction with plan directory to
                                idenfity files that should be parsed as plan
                                files.

  -c --config <cfgFile>         Use <cfgFile> as the source of configuration
                                for daily-notification.

  -h --help                     Print this usage information.
"""
  let args = docopt(doc, version = "daily_notifier 0.1.0")

  if args["--help"]:
    echo doc
    quit()

  # Find and parse the .dailynotificationrc file
  let rcLocations = @[
    if args["--config"]: $args["<cfgFile>"] else:"",
    ".dailynotificationrc", $getEnv("DAILY_NOTIFICATION_RC"),
    $getEnv("HOME") & "/.dailynotificationrc"]

  var ptkrcFilename: string =
    foldl(rcLocations, if len(a) > 0: a elif existsFile(b): b else: "")

  # Determine our plan directory and file template
  # Start our daemon process (if needed)
  # exit