package models

import (
	"time"

	"gorm.io/datatypes"

	"rocketgit.ru/rsmon/worker/app/models/concerns"
)

const (
	SubscriptionStatusTrialing = "trialing"
	SubscriptionStatusActive   = "active"
	SubscriptionStatusPastDue  = "past_due"
	SubscriptionStatusPaused   = "paused"
	SubscriptionStatusCanceled = "canceled"
	SubscriptionStatusExpired  = "expired"
)

// Subscription is the current billable entitlement for one account. M0 only
// writes manual subscriptions; provider flows are deliberately deferred.
type Subscription struct {
	concerns.Model
	AccountID              int64          `gorm:"not null;index" json:"account_id"`
	Account                *Account       `json:"-"`
	PlanID                 int64          `gorm:"not null;index" json:"plan_id"`
	Plan                   *Plan          `json:"plan,omitempty"`
	Provider               string         `gorm:"size:16;not null;default:'manual'" json:"provider"`
	ProviderSubscriptionID *string        `gorm:"size:128" json:"provider_subscription_id,omitempty"`
	ProviderCustomerID     *string        `gorm:"size:128" json:"provider_customer_id,omitempty"`
	Status                 string         `gorm:"size:24;not null;default:'active';index" json:"status"`
	BillingCycle           string         `gorm:"size:8;not null;default:'monthly'" json:"billing_cycle"`
	CurrentPeriodStart     *time.Time     `json:"current_period_start,omitempty"`
	CurrentPeriodEnd       *time.Time     `gorm:"index" json:"current_period_end,omitempty"`
	TrialEndsAt            *time.Time     `json:"trial_ends_at,omitempty"`
	CancelAtPeriodEnd      bool           `gorm:"not null;default:false" json:"cancel_at_period_end"`
	CanceledAt             *time.Time     `json:"canceled_at,omitempty"`
	Currency               string         `gorm:"size:3;not null" json:"currency"`
	AmountMinor            int64          `gorm:"not null;default:0" json:"amount_minor"`
	MetadataJSON           datatypes.JSON `gorm:"type:jsonb;not null;default:'{}'" json:"metadata_json"`
	concerns.Timestamped
}

// SubscriptionEvent is an append-only audit record for entitlement changes
// and provider deliveries. ProviderEventID makes future webhook processing
// idempotent without coupling the ledger to a specific PSP.
type SubscriptionEvent struct {
	concerns.Model
	SubscriptionID  int64          `gorm:"not null;index" json:"subscription_id"`
	AccountID       int64          `gorm:"not null;index" json:"account_id"`
	Provider        string         `gorm:"size:16;not null;default:'manual';uniqueIndex:idx_subscription_events_provider_event,priority:1" json:"provider"`
	Kind            string         `gorm:"size:32;not null" json:"kind"`
	FromPlanID      *int64         `json:"from_plan_id,omitempty"`
	ToPlanID        *int64         `json:"to_plan_id,omitempty"`
	AmountMinor     *int64         `json:"amount_minor,omitempty"`
	Currency        string         `gorm:"size:3" json:"currency,omitempty"`
	ActorUserID     *int64         `json:"actor_user_id,omitempty"`
	ProviderEventID *string        `gorm:"size:128;uniqueIndex:idx_subscription_events_provider_event,priority:2" json:"provider_event_id,omitempty"`
	PayloadJSON     datatypes.JSON `gorm:"type:jsonb;not null;default:'{}'" json:"payload_json"`
	CreatedAt       time.Time      `json:"created_at"`
}