package models

import (
	"time"

	"github.com/google/uuid"
)

// CustomerWalletTransaction is one ledger row as the customer app shows it
// (docs/prd-point-coin.md F6).
type CustomerWalletTransaction struct {
	ID       uuid.UUID `json:"id"`
	Currency string    `json:"currency"`
	Type     string    `json:"type"`
	// Signed: positive added to the balance, negative taken from it.
	Amount       int64  `json:"amount"`
	BalanceAfter int64  `json:"balance_after"`
	Description  string `json:"description"`
	// Where the value came from, set on additions.
	Source *CustomerWalletTransactionRef `json:"source,omitempty"`
	// Where the value went, set on deductions.
	Destination           *CustomerWalletTransactionRef `json:"destination,omitempty"`
	OutletID              *uuid.UUID                    `json:"outlet_id,omitempty"`
	ReversesTransactionID *uuid.UUID                    `json:"reverses_transaction_id,omitempty"`
	// Shared by the two rows of an exchange or a transfer.
	GroupID *uuid.UUID `json:"group_id,omitempty"`
	// Additions only: the earliest expiry among the lots it created, nil when none of
	// them expire, and the lots themselves.
	ExpiresAt *time.Time          `json:"expires_at,omitempty"`
	Lots      []CustomerWalletLot `json:"lots,omitempty"`
	CreatedAt time.Time           `json:"created_at"`
}

// CustomerWalletTransactionRef points at what a ledger row came from or went to, as
// listed in §8.1: ORDER, PAYMENT, WALLET_TX, GAME_PLAY, LOT, USER and so on.
type CustomerWalletTransactionRef struct {
	Type string    `json:"type"`
	ID   uuid.UUID `json:"id"`
}

type CustomerWalletLot struct {
	Amount    int64      `json:"amount"`
	Remaining int64      `json:"remaining"`
	ExpiresAt *time.Time `json:"expires_at"`
}

// CustomerWalletExpiring is how much expires on one day.
type CustomerWalletExpiring struct {
	Amount int64 `json:"amount"`
	// YYYY-MM-DD, Asia/Jakarta.
	Date string `json:"date"`
}

// CustomerWalletNearestExpiring is the next day each currency loses balance, nil when
// nothing is due to expire.
type CustomerWalletNearestExpiring struct {
	Point *CustomerWalletExpiring `json:"point"`
	Coin  *CustomerWalletExpiring `json:"coin"`
}

// ListCustomerWalletTransactionsQuery is GET /customer/wallet/transactions.
type ListCustomerWalletTransactionsQuery struct {
	Page     int    `form:"page"`
	Limit    int    `form:"limit"`
	Currency string `form:"currency"`
	// One type, or several separated by commas.
	Type string `form:"type"`
	// Inclusive calendar dates, YYYY-MM-DD, Asia/Jakarta.
	From string `form:"from"`
	To   string `form:"to"`
}

// AdminCustomerWallet is GET /marketing/customers/:id/wallet (docs/prd-point-coin.md
// F7). Unlike the customer's own view it shows the raw balances next to the spendable
// ones, every lot that still holds something, and the real names behind each row.
type AdminCustomerWallet struct {
	Customer AdminWalletCustomer `json:"customer"`
	// Balances as the ledger has them.
	PointBalance int64 `json:"point_balance"`
	CoinBalance  int64 `json:"coin_balance"`
	// What can be spent now. Lower than the ledger balance only while lots that have
	// expired wait for the expiry job.
	SpendablePointBalance int64                                     `json:"spendable_point_balance"`
	SpendableCoinBalance  int64                                     `json:"spendable_coin_balance"`
	Lots                  []AdminWalletLot                          `json:"lots"`
	Transactions          PaginatedResponse[AdminWalletTransaction] `json:"transactions"`
}

type AdminWalletCustomer struct {
	ID    uuid.UUID `json:"id"`
	Name  string    `json:"name"`
	Phone *string   `json:"phone,omitempty"`
}

type AdminWalletLot struct {
	ID                  uuid.UUID  `json:"id"`
	Currency            string     `json:"currency"`
	OriginalAmount      int64      `json:"original_amount"`
	RemainingAmount     int64      `json:"remaining_amount"`
	ExpiresAt           *time.Time `json:"expires_at"`
	Expired             bool       `json:"expired"`
	SourceTransactionID uuid.UUID  `json:"source_transaction_id"`
	OriginLotID         *uuid.UUID `json:"origin_lot_id,omitempty"`
	CreatedAt           time.Time  `json:"created_at"`
}

// AdminWalletTransaction is a ledger row with the names the customer does not see:
// the real counterparty of a transfer, the admin behind an adjustment, the cashier who
// took a payment, and the outlet.
type AdminWalletTransaction struct {
	CustomerWalletTransaction
	Counterparty *AdminWalletNamedRef `json:"counterparty,omitempty"`
	CreatedBy    *AdminWalletNamedRef `json:"created_by,omitempty"`
	Outlet       *AdminWalletNamedRef `json:"outlet,omitempty"`
	Reason       *string              `json:"reason,omitempty"`
	Metadata     map[string]any       `json:"metadata,omitempty"`
}

type AdminWalletNamedRef struct {
	ID   uuid.UUID `json:"id"`
	Name string    `json:"name"`
}

// WalletAdjustment is a manual correction by an admin.
type WalletAdjustment struct {
	Currency string
	// Signed: positive adds, negative takes away.
	Amount         int64
	Reason         string
	IdempotencyKey string
}

// AdminWalletAdjustmentResult is what POST /marketing/customers/:id/wallet/adjust returns.
type AdminWalletAdjustmentResult struct {
	Transaction           AdminWalletTransaction `json:"transaction"`
	SpendablePointBalance int64                  `json:"spendable_point_balance"`
	SpendableCoinBalance  int64                  `json:"spendable_coin_balance"`
	// True when the idempotency key had been used before and nothing changed.
	Replayed bool `json:"replayed"`
}

// CustomerWalletExpiringList is GET /customer/wallet/expiring (docs/prd-point-coin.md
// F6): everything that will expire, per currency and day, soonest first.
type CustomerWalletExpiringList struct {
	Point []CustomerWalletExpiring `json:"point"`
	Coin  []CustomerWalletExpiring `json:"coin"`
}