package daemons

import (
	"time"

	oclib "cloud.o-forge.io/core/oc-lib"
	"cloud.o-forge.io/core/oc-lib/dbs"
	"cloud.o-forge.io/core/oc-lib/models/common/enum"
	workflow_execution "cloud.o-forge.io/core/oc-lib/models/workflow_execution"
	"go.mongodb.org/mongo-driver/bson/primitive"
)

var Executions = ScheduledExecution{Execs: map[string]workflow_execution.WorkflowExecution{}}

type ExecutionManager struct{}

// Loop every second on the Execution's list and move the Execution that must start to a new list
// that will be looped over to start them
func (em *ExecutionManager) RetrieveNextExecutions() {
	logger := oclib.GetLogger()
	for {
		Executions.Mu.Lock()
		if len(Executions.Execs) > 0 {
			executions := Executions.Execs
			orderedExec := map[int]map[string]workflow_execution.WorkflowExecution{}
			for execId, exec := range executions {
				if orderedExec[exec.Priority] == nil {
					orderedExec[exec.Priority] = map[string]workflow_execution.WorkflowExecution{}
				}
				orderedExec[exec.Priority][execId] = exec
			}
			for i := range []int{7, 6, 5, 4, 3, 2, 1, 0} { // priority in reversed
				if orderedExec[i] == nil {
					continue
				}

				for execId, exec := range orderedExec[i] {
					if i == 0 && em.isAStartingExecutionBeforeEnd(&exec) { // BEST EFFORT exception
						continue
					}
					if exec.ExecDate.Before(time.Now().UTC()) {
						logger.Info().Msg("Will execute " + execId + " soon")
						go em.executeExecution(&exec)
						delete(executions, execId)
					}
				}
			}

		}
		Executions.Mu.Unlock()
		time.Sleep(time.Second)
	}
}

func (em *ExecutionManager) isAStartingExecutionBeforeEnd(execution *workflow_execution.WorkflowExecution) bool {
	access := workflow_execution.NewAccessor(nil)
	l, _, err := access.Search(&dbs.Filters{
		And: map[string][]dbs.Filter{
			"execution_date": {{Operator: dbs.LTE.String(), Value: primitive.NewDateTimeFromTime(*execution.EndDate)}},
			"state":          {{Operator: dbs.EQUAL.String(), Value: enum.SCHEDULED}},
		}, // TODO later should refine on each endpoint
	}, "", false)
	if err != nil && len(l) == 0 {
		return false
	}
	return true
}

func (em *ExecutionManager) executeExecution(execution *workflow_execution.WorkflowExecution) {
	// start execution
	// create the yaml that describes the pod : filename, path/url to Loki
	var executor Executor
	// exec_method := os.Getenv("MONITOR_METHOD")
	logger := oclib.GetLogger()

	duration := 0
	if execution.EndDate != nil {
		duration = int(execution.EndDate.Sub(execution.ExecDate).Seconds())
	}

	executor = NewContainerMonitor(execution.UUID, execution.CreatorID, duration)

	if executor == nil {
		logger.Fatal().Msg("Could not create executor")
		oclib.NewRequestAdmin(oclib.LibDataEnum(oclib.WORKFLOW_EXECUTION), nil).UpdateOne(map[string]interface{}{
			"state": enum.FAILURE.EnumIndex(),
		}, execution.GetID())
		return
	}

	args := executor.PrepareMonitorExec()
	executor.LaunchMonitor(args, execution.GetID(), logger)
}