// Package infrastructure is the public façade for all scheduling sub-services.
// Controllers and main.go import only this package; the sub-packages are
// internal implementation details.
package infrastructure

import (
	"fmt"
	"oc-scheduler/infrastructure/execution"
	"oc-scheduler/infrastructure/nats"
	"oc-scheduler/infrastructure/planner"
	"oc-scheduler/infrastructure/scheduler"
	"oc-scheduler/infrastructure/scheduling_resources"
	"oc-scheduler/infrastructure/session"
	"oc-scheduler/infrastructure/utils"
	"time"

	"cloud.o-forge.io/core/oc-lib/models/workflow"
	"cloud.o-forge.io/core/oc-lib/models/workflow_execution"
	"cloud.o-forge.io/core/oc-lib/tools"
)

// ---------------------------------------------------------------------------
// Type re-exports
// ---------------------------------------------------------------------------

type WorkflowSchedule = scheduler.WorkflowSchedule
type CheckResult = scheduler.CheckResult

// ---------------------------------------------------------------------------
// Bootstrap — called from main.go
// ---------------------------------------------------------------------------

func ListenNATS()             { nats.ListenNATS() }
func InitSelfPlanner()        { planner.InitPlanner() }
func RecoverDraftExecutions() { execution.RecoverDraft() }
func WatchExecutions()        { execution.WatchExecutions() }

// EmitNATS broadcasts a propagation message via NATS.
func EmitNATS(peerID string, message tools.PropalgationMessage) {
	utils.Propalgate(peerID, message)
}

// ---------------------------------------------------------------------------
// Utilities
// ---------------------------------------------------------------------------

func GetWorkflowPeerIDs(wfID string, req *tools.APIRequest) ([]string, error) {
	return utils.GetWorkflowPeerIDs(wfID, req)
}

// ---------------------------------------------------------------------------
// Planner subscriptions
// ---------------------------------------------------------------------------

func SubscribePlannerUpdates(peerIDs []string) (<-chan string, func()) {
	return planner.GetPlannerService().SubscribePlannerUpdates(peerIDs...)
}

func SubscribeWorkflowUpdates(wfID string) (<-chan struct{}, func()) {
	return planner.GetPlannerService().SubscribeWorkflowUpdates(wfID)
}

func RequestPlannerRefresh(peerIDs []string, executionsID string) []string {
	return planner.GetPlannerService().Refresh(peerIDs, executionsID)
}

func ReleaseRefreshOwnership(peerIDs []string, executionsID string) {
	planner.GetPlannerService().ReleaseRefreshOwnership(peerIDs, executionsID)
}

// ---------------------------------------------------------------------------
// Session management
// ---------------------------------------------------------------------------

func UpsertSessionDrafts(
	executionsID string,
	execs []*workflow_execution.WorkflowExecution,
	purchases, bookings []scheduling_resources.SchedulerObject,
	req *tools.APIRequest,
) {
	svc := session.NewSessionExecutionsService(executionsID)
	svc.UpsertSessionDrafts(purchases, bookings, execs, req)
}

func CleanupSession(executionsID string, req *tools.APIRequest) {
	svc := session.NewSessionExecutionsService(executionsID)
	svc.CleanupSession(req)
}

func UnscheduleExecution(executionID string, req *tools.APIRequest) error {
	return execution.Unschedule(executionID, req)
}

// ---------------------------------------------------------------------------
// Schedule confirmation
// ---------------------------------------------------------------------------

func Schedule(
	ws *WorkflowSchedule,
	wfID string,
	req *tools.APIRequest,
) (*WorkflowSchedule, *workflow.Workflow, []*workflow_execution.WorkflowExecution, error) {
	if req == nil {
		return ws, nil, nil, fmt.Errorf("no request provided")
	}
	if ws.UUID == "" {
		return ws, nil, nil, fmt.Errorf("no scheduling session: use the Check stream first")
	}

	svc := session.NewSessionExecutionsService(ws.UUID)

	executions := svc.LoadSessionExecs()
	for _, exec := range executions {
		if !exec.ExecDate.IsZero() && exec.ExecDate.Before(time.Now().UTC()) {
			return ws, nil, nil, fmt.Errorf("execution %s is obsolete (start date in the past)", exec.GetID())
		}
	}

	if err := svc.ConfirmSession(req); err != nil {
		return ws, nil, nil, fmt.Errorf("confirm session failed: %w", err)
	}

	for _, exec := range executions {
		go execution.WatchDeadline(exec.GetID(), exec.ExecutionsID, exec.ExecDate, req)
	}

	adminReq := &tools.APIRequest{Admin: true}
	obj, _, _ := workflow.NewAccessor(req).LoadOne(wfID)
	if obj == nil {
		return ws, nil, executions, nil
	}
	wf := obj.(*workflow.Workflow)
	ws.Workflow = wf
	ws.WorkflowExecution = executions
	wf.GetAccessor(adminReq).UpdateOne(wf.Serialize(wf), wf.GetID())
	return ws, wf, executions, nil
}