package domain

import (
	"context"
	"fmt"
	"time"

	"gorm.io/datatypes"
)

// UrgencyLevel defines the urgency of a service need
type UrgencyLevel string

const (
	UrgencyLow    UrgencyLevel = "low"
	UrgencyMedium UrgencyLevel = "medium"
	UrgencyHigh   UrgencyLevel = "high"
)

// ServiceNeed represents a service needed by an organization (database entity)
// Note: There's also a ServiceNeedJSON struct in organization.go for API serialization
type ServiceNeed struct {
	ID                 string         `gorm:"primaryKey;type:text"`
	Type               string         `gorm:"not null;type:text;index"` // Type of service needed
	Description        string         `gorm:"type:text"`
	Urgency            UrgencyLevel   `gorm:"type:varchar(20);default:'medium'"`
	Budget             float64        `gorm:"type:decimal(10,2)"`      // Available budget in €
	PreferredProviders datatypes.JSON `gorm:"type:jsonb;default:'[]'"` // []string - Organization IDs

	// Business information
	OrganizationID string        `gorm:"not null;type:text;index"`
	Organization   *Organization `gorm:"foreignKey:OrganizationID"`

	// Additional metadata
	Requirements datatypes.JSON `gorm:"type:jsonb;default:'{}'"`           // Specific requirements
	Timeframe    string         `gorm:"type:text"`                         // When service is needed
	Status       string         `gorm:"type:varchar(50);default:'active'"` // active, fulfilled, cancelled
	Sources      datatypes.JSON `gorm:"type:jsonb"`                        // Data sources

	// Timestamps
	CreatedAt time.Time `gorm:"autoCreateTime"`
	UpdatedAt time.Time `gorm:"autoUpdateTime"`
}

// TableName specifies the table name for GORM
func (ServiceNeed) TableName() string {
	return "service_needs"
}

// ServiceNeedRepository defines operations for service need management
type ServiceNeedRepository interface {
	Create(ctx context.Context, serviceNeed *ServiceNeed) error
	GetByID(ctx context.Context, id string) (*ServiceNeed, error)
	GetByOrganization(ctx context.Context, organizationID string) ([]*ServiceNeed, error)
	GetByType(ctx context.Context, serviceType string) ([]*ServiceNeed, error)
	GetByUrgency(ctx context.Context, urgency UrgencyLevel) ([]*ServiceNeed, error)
	GetActiveNeeds(ctx context.Context) ([]*ServiceNeed, error)
	Update(ctx context.Context, serviceNeed *ServiceNeed) error
	Delete(ctx context.Context, id string) error
}

// Validate performs business rule validation
func (sn *ServiceNeed) Validate() error {
	if sn.Type == "" {
		return fmt.Errorf("service type cannot be empty")
	}
	if sn.Budget < 0 {
		return fmt.Errorf("budget cannot be negative")
	}
	return nil
}