// Package profile implements a user-profile actor grain (same event-driven
// framework as the cart, checkout, and order grains). Mutations are the proto
// messages in proto/profile; the grain's event log is the source of truth and
// ProfileGrain is the projection rebuilt by replaying them.
package profile

import (
	"encoding/json"
	"sync"
	"time"
)

// LinkedCart records a cart id linked to this profile.
type LinkedCart struct {
	CartId uint64 `json:"cartId"`
	Label  string `json:"label,omitempty"`
}

// LinkedCheckout records a checkout id linked to this profile.
type LinkedCheckout struct {
	CheckoutId uint64 `json:"checkoutId"`
	CartId     uint64 `json:"cartId"`
}

// LinkedOrder records an order linked to this profile.
type LinkedOrder struct {
	OrderReference string `json:"orderReference"`
	CartId         uint64 `json:"cartId"`
	Status         string `json:"status,omitempty"`
}

// StoredAddress is a saved address in the user's address book.
type StoredAddress struct {
	Id                uint32 `json:"id"`
	Label             string `json:"label,omitempty"`
	FullName          string `json:"fullName,omitempty"`
	AddressLine1      string `json:"addressLine1"`
	AddressLine2      string `json:"addressLine2,omitempty"`
	City              string `json:"city"`
	State             string `json:"state,omitempty"`
	Zip               string `json:"zip"`
	Country           string `json:"country"`
	Phone             string `json:"phone,omitempty"`
	IsDefaultShipping bool   `json:"isDefaultShipping,omitempty"`
	IsDefaultBilling  bool   `json:"isDefaultBilling,omitempty"`
}

// ProfileGrain is the projected current state of a user profile. It implements
// actor.Grain[ProfileGrain].
type ProfileGrain struct {
	mu         sync.RWMutex
	lastAccess time.Time
	lastChange time.Time
	nextAddrId uint32

	Id       uint64 `json:"id"`
	Name     string `json:"name,omitempty"`
	Email    string `json:"email,omitempty"`
	Phone    string `json:"phone,omitempty"`
	Language string `json:"language,omitempty"`
	Currency string `json:"currency,omitempty"`

	AvatarUrl string           `json:"avatarUrl,omitempty"`
	Carts     []LinkedCart     `json:"carts,omitempty"`
	Checkouts []LinkedCheckout `json:"checkouts,omitempty"`
	Orders    []LinkedOrder    `json:"orders,omitempty"`
	Addresses []StoredAddress  `json:"addresses,omitempty"`
}

// NewProfileGrain returns an empty profile grain for id.
func NewProfileGrain(id uint64, ts time.Time) *ProfileGrain {
	return &ProfileGrain{
		Id:         id,
		lastAccess: ts,
		lastChange: ts,
	}
}

// --- actor.Grain[ProfileGrain] ---

func (p *ProfileGrain) GetId() uint64 { return p.Id }

func (p *ProfileGrain) GetLastAccess() time.Time { return p.lastAccess }

func (p *ProfileGrain) GetLastChange() time.Time { return p.lastChange }

func (p *ProfileGrain) GetCurrentState() (*ProfileGrain, error) {
	p.lastAccess = time.Now()
	return p, nil
}

func (p *ProfileGrain) GetState() ([]byte, error) { return json.Marshal(p) }

// NextAddrId returns the next address id and advances the counter.
func (p *ProfileGrain) NextAddrId() uint32 {
	p.nextAddrId++
	return p.nextAddrId
}

// findAddress returns a pointer to the address with the given id, or nil.
func (p *ProfileGrain) findAddress(id uint32) *StoredAddress {
	for i := range p.Addresses {
		if p.Addresses[i].Id == id {
			return &p.Addresses[i]
		}
	}
	return nil
}