package pointsmall

import (
	"errors"
	"time"

	"hfb_sys/backend/internal/model"
)

var (
	ErrDependencyUnavailable = errors.New("points mall dependency unavailable")
	ErrInvalidInput          = errors.New("invalid points mall input")
	ErrProductUnavailable    = errors.New("points mall product unavailable")
	ErrInsufficientPoints    = errors.New("insufficient points")
	ErrRedeemLimitExceeded   = errors.New("redeem limit exceeded")
	ErrRedemptionNotPending  = errors.New("redemption not pending")
)

type SummaryDTO struct {
	AvailablePoints     int64  `json:"available_points"`
	LifetimePoints      int64  `json:"lifetime_points"`
	LevelCode           string `json:"level_code"`
	LevelName           string `json:"level_name"`
	PointsPerYuan       int64  `json:"points_per_yuan"`
	PointsMultiplierBps int    `json:"points_multiplier_bps"`
}

type ProductDTO struct {
	ID                     uint64    `json:"id"`
	Title                  string    `json:"title"`
	Subtitle               string    `json:"subtitle"`
	Description            string    `json:"description"`
	CoverURL               string    `json:"cover_url"`
	RedemptionInstructions string    `json:"redemption_instructions"`
	PointsPrice            int64     `json:"points_price"`
	Stock                  int64     `json:"stock"`
	RedeemedCount          int64     `json:"redeemed_count"`
	PerUserLimit           int       `json:"per_user_limit"`
	Status                 string    `json:"status"`
	SortOrder              int       `json:"sort_order"`
	CreatedAt              time.Time `json:"created_at"`
	UpdatedAt              time.Time `json:"updated_at"`
}

type ProductRequest struct {
	Title                  string `json:"title" binding:"required,max=128"`
	Subtitle               string `json:"subtitle" binding:"max=255"`
	Description            string `json:"description" binding:"required"`
	CoverURL               string `json:"cover_url"`
	RedemptionInstructions string `json:"redemption_instructions" binding:"required"`
	PointsPrice            int64  `json:"points_price" binding:"required,min=1"`
	Stock                  int64  `json:"stock" binding:"min=0"`
	PerUserLimit           int    `json:"per_user_limit" binding:"required,min=1,max=100"`
	Status                 string `json:"status" binding:"required,oneof=online offline"`
	SortOrder              int    `json:"sort_order"`
}

type RedeemRequest struct {
	Quantity int `json:"quantity" binding:"required,min=1,max=10"`
}

type CompleteRedemptionRequest struct {
	Remark string `json:"remark" binding:"max=255"`
}

type RedemptionDTO struct {
	ID                     uint64     `json:"id"`
	RedemptionNo           string     `json:"redemption_no"`
	UserID                 uint64     `json:"user_id"`
	UserPhone              string     `json:"user_phone,omitempty"`
	UserNickname           string     `json:"user_nickname,omitempty"`
	ProductID              uint64     `json:"product_id"`
	ProductTitle           string     `json:"product_title"`
	ProductCoverURL        string     `json:"product_cover_url"`
	RedemptionInstructions string     `json:"redemption_instructions"`
	PointsPrice            int64      `json:"points_price"`
	Quantity               int        `json:"quantity"`
	TotalPoints            int64      `json:"total_points"`
	Status                 string     `json:"status"`
	AdminRemark            string     `json:"admin_remark"`
	CompletedBy            *uint64    `json:"completed_by,omitempty"`
	CompletedAt            *time.Time `json:"completed_at"`
	CreatedAt              time.Time  `json:"created_at"`
}

func toProductDTO(item model.PointsMallProduct) ProductDTO {
	return ProductDTO{
		ID:                     item.ID,
		Title:                  item.Title,
		Subtitle:               item.Subtitle,
		Description:            item.Description,
		CoverURL:               item.CoverURL,
		RedemptionInstructions: item.RedemptionInstructions,
		PointsPrice:            item.PointsPrice,
		Stock:                  item.Stock,
		RedeemedCount:          item.RedeemedCount,
		PerUserLimit:           item.PerUserLimit,
		Status:                 item.Status,
		SortOrder:              item.SortOrder,
		CreatedAt:              item.CreatedAt,
		UpdatedAt:              item.UpdatedAt,
	}
}

func toRedemptionDTO(item model.PointsMallRedemption) RedemptionDTO {
	return RedemptionDTO{
		ID:                     item.ID,
		RedemptionNo:           item.RedemptionNo,
		UserID:                 item.UserID,
		ProductID:              item.ProductID,
		ProductTitle:           item.ProductTitle,
		ProductCoverURL:        item.ProductCoverURL,
		RedemptionInstructions: item.RedemptionInstructions,
		PointsPrice:            item.PointsPrice,
		Quantity:               item.Quantity,
		TotalPoints:            item.TotalPoints,
		Status:                 item.Status,
		AdminRemark:            item.AdminRemark,
		CompletedBy:            item.CompletedBy,
		CompletedAt:            item.CompletedAt,
		CreatedAt:              item.CreatedAt,
	}
}