package logic

import (
	"context"

	"healthapi/internal/model"
	"healthapi/internal/svc"
	"healthapi/internal/types"
	"healthapi/pkg/errorx"

	"github.com/zeromicro/go-zero/core/logx"
)

type GetPurchaseHistoryLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewGetPurchaseHistoryLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetPurchaseHistoryLogic {
	return &GetPurchaseHistoryLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *GetPurchaseHistoryLogic) GetPurchaseHistory(req *types.PageReq) (resp *types.PurchaseHistoryResp, err error) {
	userID, err := GetUserIDFromCtx(l.ctx)
	if err != nil {
		return nil, errorx.ErrUnauthorized
	}

	var histories []model.PurchaseHistory
	var total int64

	query := l.svcCtx.DB.Model(&model.PurchaseHistory{}).Where("user_id = ?", userID)
	query.Count(&total)

	offset := (req.Page - 1) * req.PageSize
	query.Order("purchased_at DESC").Offset(offset).Limit(req.PageSize).Find(&histories)

	resp = &types.PurchaseHistoryResp{
		History: make([]types.PurchaseHistory, 0, len(histories)),
		PageInfo: types.PageInfo{
			Total:    total,
			Page:     req.Page,
			PageSize: req.PageSize,
		},
	}

	for _, h := range histories {
		resp.History = append(resp.History, types.PurchaseHistory{
			ID:          uint(h.ID),
			UserID:      h.UserID,
			OrderNo:     h.OrderNo,
			ProductID:   h.ProductID,
			ProductName: h.ProductName,
			PurchasedAt: h.PurchasedAt.Format("2006-01-02 15:04:05"),
			Source:      h.Source,
		})
	}

	return resp, nil
}