package domain

import (
	"context"
	"time"
)

// SubscriptionPlan represents a subscription plan tier
type SubscriptionPlan string

const (
	SubscriptionPlanFree         SubscriptionPlan = "free"
	SubscriptionPlanBasic        SubscriptionPlan = "basic"
	SubscriptionPlanProfessional SubscriptionPlan = "professional"
	SubscriptionPlanEnterprise   SubscriptionPlan = "enterprise"
)

// SubscriptionStatus represents the status of a subscription
type SubscriptionStatus string

const (
	SubscriptionStatusActive   SubscriptionStatus = "active"
	SubscriptionStatusCanceled SubscriptionStatus = "canceled"
	SubscriptionStatusPastDue  SubscriptionStatus = "past_due"
	SubscriptionStatusTrialing SubscriptionStatus = "trialing"
	SubscriptionStatusExpired  SubscriptionStatus = "expired"
	SubscriptionStatusNone     SubscriptionStatus = "none"
)

// BillingPeriod represents the billing frequency
type BillingPeriod string

const (
	BillingPeriodMonthly BillingPeriod = "monthly"
	BillingPeriodYearly  BillingPeriod = "yearly"
)

// Subscription represents a user's subscription
type Subscription struct {
	ID                   string             `gorm:"primaryKey;type:text"`
	UserID               string             `gorm:"type:text;not null;index"`
	Plan                 SubscriptionPlan   `gorm:"type:varchar(50);not null;default:'free'"`
	Status               SubscriptionStatus `gorm:"type:varchar(20);not null;default:'none'"`
	BillingPeriod        BillingPeriod      `gorm:"type:varchar(20);not null;default:'monthly'"`
	CurrentPeriodStart   time.Time          `gorm:"not null"`
	CurrentPeriodEnd     time.Time          `gorm:"not null"`
	CancelAtPeriodEnd    bool               `gorm:"default:false"`
	TrialEnd             *time.Time         `gorm:"index"`
	StripeSubscriptionID string             `gorm:"type:text;index"`
	StripeCustomerID     string             `gorm:"type:text;index"`
	CreatedAt            time.Time          `gorm:"autoCreateTime"`
	UpdatedAt            time.Time          `gorm:"autoUpdateTime"`

	// Associations
	User *User `gorm:"foreignKey:UserID"`
}

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

// PaymentMethodType represents the type of payment method
type PaymentMethodType string

const (
	PaymentMethodTypeCard        PaymentMethodType = "card"
	PaymentMethodTypeBankAccount PaymentMethodType = "bank_account"
)

// PaymentMethod represents a payment method for a user
type PaymentMethod struct {
	ID                    string            `gorm:"primaryKey;type:text"`
	UserID                string            `gorm:"type:text;not null;index"`
	Type                  PaymentMethodType `gorm:"type:varchar(20);not null"`
	StripePaymentMethodID string            `gorm:"type:text;index"`
	Last4                 string            `gorm:"type:varchar(4)"`
	Brand                 string            `gorm:"type:varchar(50)"`
	ExpiryMonth           *int              `gorm:"type:integer"`
	ExpiryYear            *int              `gorm:"type:integer"`
	IsDefault             bool              `gorm:"default:false"`
	CreatedAt             time.Time         `gorm:"autoCreateTime"`
	UpdatedAt             time.Time         `gorm:"autoUpdateTime"`

	// Associations
	User *User `gorm:"foreignKey:UserID"`
}

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

// InvoiceStatus represents the status of an invoice
type InvoiceStatus string

const (
	InvoiceStatusDraft         InvoiceStatus = "draft"
	InvoiceStatusOpen          InvoiceStatus = "open"
	InvoiceStatusPaid          InvoiceStatus = "paid"
	InvoiceStatusVoid          InvoiceStatus = "void"
	InvoiceStatusUncollectible InvoiceStatus = "uncollectible"
)

// Invoice represents a subscription invoice
type Invoice struct {
	ID              string        `gorm:"primaryKey;type:text"`
	UserID          string        `gorm:"type:text;not null;index"`
	SubscriptionID  string        `gorm:"type:text;not null;index"`
	StripeInvoiceID string        `gorm:"type:text;index"`
	Status          InvoiceStatus `gorm:"type:varchar(20);not null;default:'draft'"`
	Amount          int64         `gorm:"type:bigint;not null"` // Amount in cents
	Currency        string        `gorm:"type:varchar(3);default:'USD'"`
	PeriodStart     time.Time     `gorm:"not null"`
	PeriodEnd       time.Time     `gorm:"not null"`
	PaidAt          *time.Time    `gorm:"index"`
	DueDate         time.Time     `gorm:"not null"`
	InvoicePDF      string        `gorm:"type:text"` // URL to invoice PDF
	CreatedAt       time.Time     `gorm:"autoCreateTime"`
	UpdatedAt       time.Time     `gorm:"autoUpdateTime"`

	// Associations
	User         *User         `gorm:"foreignKey:UserID"`
	Subscription *Subscription `gorm:"foreignKey:SubscriptionID"`
}

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

// UsageLimitType represents the type of usage limit
type UsageLimitType string

const (
	UsageLimitTypeOrganizations UsageLimitType = "organizations"
	UsageLimitTypeUsers         UsageLimitType = "users"
	UsageLimitTypeStorage       UsageLimitType = "storage"
	UsageLimitTypeAPICalls      UsageLimitType = "api_calls"
	UsageLimitTypeCustomDomains UsageLimitType = "custom_domains"
)

// UsageTracking represents usage tracking for subscription limits
type UsageTracking struct {
	ID           string         `gorm:"primaryKey;type:text"`
	UserID       string         `gorm:"type:text;not null;index"`
	LimitType    UsageLimitType `gorm:"type:varchar(50);not null;index"`
	CurrentUsage int64          `gorm:"type:bigint;default:0"`
	PeriodStart  time.Time      `gorm:"not null;index"`
	PeriodEnd    time.Time      `gorm:"not null;index"`
	CreatedAt    time.Time      `gorm:"autoCreateTime"`
	UpdatedAt    time.Time      `gorm:"autoUpdateTime"`

	// Associations
	User *User `gorm:"foreignKey:UserID"`
}

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

// SubscriptionRepository defines the interface for subscription operations
type SubscriptionRepository interface {
	Create(ctx context.Context, subscription *Subscription) error
	GetByID(ctx context.Context, id string) (*Subscription, error)
	GetByUserID(ctx context.Context, userID string) (*Subscription, error)
	GetActiveByUserID(ctx context.Context, userID string) (*Subscription, error)
	Update(ctx context.Context, subscription *Subscription) error
	UpdateStatus(ctx context.Context, id string, status SubscriptionStatus) error
	Delete(ctx context.Context, id string) error
}

// PaymentMethodRepository defines the interface for payment method operations
type PaymentMethodRepository interface {
	Create(ctx context.Context, paymentMethod *PaymentMethod) error
	GetByID(ctx context.Context, id string) (*PaymentMethod, error)
	GetByUserID(ctx context.Context, userID string) ([]*PaymentMethod, error)
	GetDefaultByUserID(ctx context.Context, userID string) (*PaymentMethod, error)
	Update(ctx context.Context, paymentMethod *PaymentMethod) error
	SetDefault(ctx context.Context, userID string, paymentMethodID string) error
	Delete(ctx context.Context, id string) error
}

// InvoiceRepository defines the interface for invoice operations
type InvoiceRepository interface {
	Create(ctx context.Context, invoice *Invoice) error
	GetByID(ctx context.Context, id string) (*Invoice, error)
	GetByUserID(ctx context.Context, userID string, limit, offset int) ([]*Invoice, int64, error)
	GetBySubscriptionID(ctx context.Context, subscriptionID string) ([]*Invoice, error)
	Update(ctx context.Context, invoice *Invoice) error
}

// UsageTrackingRepository defines the interface for usage tracking operations
type UsageTrackingRepository interface {
	Create(ctx context.Context, usage *UsageTracking) error
	GetByUserIDAndType(ctx context.Context, userID string, limitType UsageLimitType, periodStart time.Time) (*UsageTracking, error)
	UpdateUsage(ctx context.Context, userID string, limitType UsageLimitType, periodStart time.Time, amount int64) error
	GetCurrentPeriodUsage(ctx context.Context, userID string, limitType UsageLimitType) (*UsageTracking, error)
}