package alerts

import (
	"context"
	"fmt"
	"time"

	"gitea.maximumdirect.net/ejr/weatherapi/internal/core/ports"
)

type Service struct {
	repo ports.AlertRepository
}

func NewService(repo ports.AlertRepository) *Service {
	return &Service{repo: repo}
}

type Response struct {
	Alerts []AlertResponse `json:"alerts"`
}

type AlertResponse struct {
	Effective   *time.Time `json:"effective,omitempty"`
	Expires     *time.Time `json:"expires,omitempty"`
	Severity    *string    `json:"severity,omitempty"`
	Event       *string    `json:"event,omitempty"`
	Headline    *string    `json:"headline,omitempty"`
	Instruction *string    `json:"instruction,omitempty"`
	Description *string    `json:"description,omitempty"`
}

func (s *Service) GetCurrent(ctx context.Context) (Response, error) {
	if s == nil {
		return Response{}, fmt.Errorf("alerts service is nil")
	}

	rows, err := s.repo.ListCurrentAlerts(ctx)
	if err != nil {
		return Response{}, err
	}

	alerts := make([]AlertResponse, 0, len(rows))
	for _, row := range rows {
		alerts = append(alerts, AlertResponse{
			Effective:   row.Effective,
			Expires:     row.Expires,
			Severity:    row.Severity,
			Event:       row.Event,
			Headline:    row.Headline,
			Instruction: row.Instruction,
			Description: row.Description,
		})
	}

	return Response{Alerts: alerts}, nil
}