# EventBridge schedules.
#
# Every schedule is an EST/EDT pair firing the same function one hour apart in
# UTC: EventBridge cron has no timezone. Both fire year-round and the handlers
# are idempotent, so the run that lands in the wrong offset is a harmless no-op.
# Do not "deduplicate" a pair.
#
# Rule names are stable and hand-chosen (the retired SAM stack used generated
# physical IDs). They are load-bearing: each aws_lambda_permission grants
# events.amazonaws.com on the matching rule ARN.

locals {
  schedules = {
    "close-form-est" = {
      description   = "Close form Thursday 11:59pm EST (04:59 UTC Friday)"
      schedule      = "cron(59 4 ? * FRI *)"
      function_arn  = aws_lambda_function.close_form.arn
      function_name = aws_lambda_function.close_form.function_name
      input         = null
    }
    "close-form-edt" = {
      description   = "Close form Thursday 11:59pm EDT (03:59 UTC Friday)"
      schedule      = "cron(59 3 ? * FRI *)"
      function_arn  = aws_lambda_function.close_form.arn
      function_name = aws_lambda_function.close_form.function_name
      input         = null
    }
    "reminder-est" = {
      description   = "DM reminders Thursday 10am EST (15:00 UTC)"
      schedule      = "cron(0 15 ? * THU *)"
      function_arn  = aws_lambda_function.slack_notifier.arn
      function_name = aws_lambda_function.slack_notifier.function_name
      input         = "{\"event\": \"reminder\"}"
    }
    "reminder-edt" = {
      description   = "DM reminders Thursday 10am EDT (14:00 UTC)"
      schedule      = "cron(0 14 ? * THU *)"
      function_arn  = aws_lambda_function.slack_notifier.arn
      function_name = aws_lambda_function.slack_notifier.function_name
      input         = "{\"event\": \"reminder\"}"
    }
    "sync-roster-est" = {
      description   = "Sync roster Monday 6:55am EST (11:55 UTC), before menu publish"
      schedule      = "cron(55 11 ? * MON *)"
      function_arn  = aws_lambda_function.sync_roster.arn
      function_name = aws_lambda_function.sync_roster.function_name
      input         = null
    }
    "sync-roster-edt" = {
      description   = "Sync roster Monday 6:55am EDT (10:55 UTC), before menu publish"
      schedule      = "cron(55 10 ? * MON *)"
      function_arn  = aws_lambda_function.sync_roster.arn
      function_name = aws_lambda_function.sync_roster.function_name
      input         = null
    }
  }
}

resource "aws_cloudwatch_event_rule" "schedule" {
  for_each = local.schedules

  name                = "${local.project}-${each.key}"
  description         = each.value.description
  schedule_expression = each.value.schedule
  state               = "ENABLED"
}

resource "aws_cloudwatch_event_target" "schedule" {
  for_each = local.schedules

  rule      = aws_cloudwatch_event_rule.schedule[each.key].name
  target_id = "${local.project}-${each.key}"
  arn       = each.value.function_arn
  input     = each.value.input
}

resource "aws_lambda_permission" "schedule" {
  for_each = local.schedules

  statement_id  = "AllowEventBridgeInvoke-${each.key}"
  action        = "lambda:InvokeFunction"
  function_name = each.value.function_name
  principal     = "events.amazonaws.com"
  source_arn    = aws_cloudwatch_event_rule.schedule[each.key].arn
}