// Test pronto functions
// Tests for fallback, parallel, race, sequence

var test_count = 0

function make_requestor(name, delay_seconds, should_succeed) {
  return function(callback, value) {
    log.console(`Starting ${name} with value: ${value}`)
    if (delay_seconds > 0) {
      $delay(function() {
        if (should_succeed) {
          log.console(`${name} succeeded with: ${value + 1}`)
          callback(value + 1)
        } else {
          log.console(`${name} failed`)
          callback(null, `${name} error`)
        }
      }, delay_seconds)
    } else {
      if (should_succeed) {
        log.console(`${name} succeeded immediately with: ${value + 1}`)
        callback(value + 1)
      } else {
        log.console(`${name} failed immediately`)
        callback(null, `${name} error`)
      }
    }
  }
}

return {
  test_fallback: function() {
    log.console("Testing fallback...")
    var req1 = make_requestor("fallback_req1", 0.1, false)  // fails
    var req2 = make_requestor("fallback_req2", 0.1, true)   // succeeds
    var req3 = make_requestor("fallback_req3", 0.1, true)   // should not run

    fallback([req1, req2, req3])(function(result, reason) {
      if (result != null) {
        log.console(`Fallback succeeded: ${result}`)
      } else {
        log.console(`Fallback failed: ${reason}`)
      }
    }, 10)
  },

  test_parallel: function() {
    log.console("Testing parallel...")
    var req1 = make_requestor("parallel_req1", 0.2, true)
    var req2 = make_requestor("parallel_req2", 0.1, true)
    var req3 = make_requestor("parallel_req3", 0.3, true)

    parallel([req1, req2, req3])(function(results, reason) {
      if (results != null) {
        log.console(`Parallel results: ${results}`)
      } else {
        log.console(`Parallel failed: ${reason}`)
      }
    }, 100)
  },

  test_race: function() {
    log.console("Testing race...")
    var req1 = make_requestor("race_req1", 0.3, true)  // slow
    var req2 = make_requestor("race_req2", 0.1, true)  // fast winner
    var req3 = make_requestor("race_req3", 0.2, true)  // medium

    race([req1, req2, req3])(function(result, reason) {
      if (result != null) {
        log.console(`Race winner: ${result}`)
      } else {
        log.console(`Race failed: ${reason}`)
      }
    }, 200)
  },

  test_sequence: function() {
    log.console("Testing sequence...")
    var req1 = make_requestor("seq_req1", 0.1, true)
    var req2 = make_requestor("seq_req2", 0.1, true)
    var req3 = make_requestor("seq_req3", 0.1, true)

    sequence([req1, req2, req3])(function(result, reason) {
      if (result != null) {
        log.console(`Sequence result: ${result}`)
      } else {
        log.console(`Sequence failed: ${reason}`)
      }
    }, 1000)
  },

  test_immediate_requestors: function() {
    log.console("Testing immediate requestors...")
    var req1 = make_requestor("imm1", 0, true)
    var req2 = make_requestor("imm2", 0, true)

    sequence([req1, req2])(function(result, reason) {
      if (result != null) {
        log.console(`Immediate sequence result: ${result}`)
      } else {
        log.console(`Immediate sequence failed: ${reason}`)
      }
    }, 0)
  }
}