package app

import (
	"context"
	"encoding/json"
	"fmt"
	"strings"
	"time"

	"go.uber.org/zap"

	"github.com/geo-platform/tenant-api/internal/shared/config"
	"github.com/geo-platform/tenant-api/internal/shared/messaging/rabbitmq"
	"github.com/geo-platform/tenant-api/internal/shared/stream"
)

func publishDesktopDispatchEvent(
	ctx context.Context,
	client *rabbitmq.Client,
	logger *zap.Logger,
	event stream.DesktopDispatchEvent,
) error {
	if client == nil || strings.TrimSpace(event.TargetClientID) == "" {
		return nil
	}

	routingKey := desktopDispatchRoutingKey(client.Config(), event.Kind, event.Lane, event.TargetClientID)
	body, err := json.Marshal(event)
	if err != nil {
		return err
	}
	if err := client.PublishDesktopDispatch(ctx, routingKey, body); err != nil {
		return err
	}
	return nil
}

func desktopDispatchRoutingKey(cfg config.RabbitMQConfig, kind, lane, targetClientID string) string {
	prefix := strings.TrimSpace(cfg.DesktopDispatchPublishPrefix)
	if strings.TrimSpace(kind) == "monitor" {
		prefix = strings.TrimSpace(cfg.DesktopDispatchMonitorPrefix)
	}
	if prefix == "" {
		if strings.TrimSpace(kind) == "monitor" {
			prefix = "monitor"
		} else {
			prefix = "publish"
		}
	}

	if strings.TrimSpace(kind) == "monitor" && strings.TrimSpace(lane) != "" {
		return fmt.Sprintf("%s.%s.%s", prefix, monitorDispatchLaneSegment(lane), targetClientID)
	}
	if strings.TrimSpace(kind) == "monitor" {
		return fmt.Sprintf("%s.normal.%s", prefix, targetClientID)
	}
	return fmt.Sprintf("%s.%s", prefix, targetClientID)
}

func monitorDispatchLaneSegment(lane string) string {
	switch strings.TrimSpace(lane) {
	case "high":
		return "high"
	case "retry":
		return "retry"
	default:
		return "normal"
	}
}

func publishMonitorDispatchSignal(
	ctx context.Context,
	client *rabbitmq.Client,
	logger *zap.Logger,
	workspaceID int64,
	targetClientID string,
	lane string,
	priority int,
	interruptGeneration int,
) {
	event := stream.DesktopDispatchEvent{
		Type:                "task_available",
		TaskID:              "",
		JobID:               "",
		WorkspaceID:         workspaceID,
		TargetClientID:      targetClientID,
		Status:              "queued",
		Kind:                "monitor",
		Priority:            priority,
		Lane:                strings.TrimSpace(lane),
		InterruptGeneration: interruptGeneration,
		SignalOnly:          true,
		UpdatedAt:           time.Now().UTC(),
	}
	if err := publishDesktopDispatchEvent(ctx, client, logger, event); err != nil && logger != nil {
		logger.Warn("monitor dispatch signal publish failed",
			zap.String("target_client_id", targetClientID),
			zap.String("lane", lane),
			zap.Error(err),
		)
	}
}

func publishMonitorControlEvent(
	ctx context.Context,
	client *rabbitmq.Client,
	logger *zap.Logger,
	workspaceID int64,
	targetClientID string,
	taskID int64,
	reason string,
	interruptGeneration int,
) {
	event := stream.DesktopDispatchEvent{
		Type:                "task_control",
		TaskID:              fmt.Sprintf("%d", taskID),
		JobID:               "",
		WorkspaceID:         workspaceID,
		TargetClientID:      targetClientID,
		Status:              "queued",
		Kind:                "monitor",
		Lane:                "high",
		InterruptGeneration: interruptGeneration,
		Control:             "interrupt_requested",
		Reason:              reason,
		UpdatedAt:           time.Now().UTC(),
	}
	if err := publishDesktopDispatchEvent(ctx, client, logger, event); err != nil && logger != nil {
		logger.Warn("monitor control event publish failed",
			zap.String("target_client_id", targetClientID),
			zap.Int64("task_id", taskID),
			zap.Error(err),
		)
	}
}