feat: add group buy secondhand and file storage

backend/src/main/java/com/linhelp/groupbuy/GroupBuyController.java

@@ -0,0 +1,119 @@
+package com.linhelp.groupbuy;
+
+import com.linhelp.common.api.ApiResponse;
+import com.linhelp.common.security.AuthService;
+import com.linhelp.common.security.CurrentUser;
+import com.linhelp.common.security.RequireRole;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.validation.Valid;
+import java.util.List;
+
+@RestController
+public class GroupBuyController {
+    private final GroupBuyService groupBuyService;
+    private final GroupBuyOrderService orderService;
+    private final AuthService authService;
+
+    public GroupBuyController(GroupBuyService groupBuyService,
+                              GroupBuyOrderService orderService,
+                              AuthService authService) {
+        this.groupBuyService = groupBuyService;
+        this.orderService = orderService;
+        this.authService = authService;
+    }
+
+    @GetMapping("/api/admin/group-buys")
+    @RequireRole({"PLATFORM_ADMIN", "COMMUNITY_ADMIN", "MERCHANT"})
+    public ApiResponse<List<GroupBuyResponse>> listAdmin() {
+        CurrentUser user = authService.currentUser();
+        return ApiResponse.ok(groupBuyService.listAdmin(user.getCommunityId()));
+    }
+
+    @PostMapping("/api/admin/group-buys")
+    @RequireRole({"PLATFORM_ADMIN", "COMMUNITY_ADMIN", "MERCHANT"})
+    public ApiResponse<GroupBuyResponse> create(@Valid @RequestBody GroupBuyRequest request) {
+        CurrentUser user = authService.currentUser();
+        request.setTenantId(user.getTenantId());
+        request.setCommunityId(user.getCommunityId());
+        return ApiResponse.ok(groupBuyService.create(request));
+    }
+
+    @PutMapping("/api/admin/group-buys/{id}")
+    @RequireRole({"PLATFORM_ADMIN", "COMMUNITY_ADMIN", "MERCHANT"})
+    public ApiResponse<GroupBuyResponse> update(@PathVariable Long id, @Valid @RequestBody GroupBuyRequest request) {
+        CurrentUser user = authService.currentUser();
+        request.setTenantId(user.getTenantId());
+        request.setCommunityId(user.getCommunityId());
+        return ApiResponse.ok(groupBuyService.update(id, request));
+    }
+
+    @PutMapping("/api/admin/group-buys/{id}/start")
+    @RequireRole({"PLATFORM_ADMIN", "COMMUNITY_ADMIN", "MERCHANT"})
+    public ApiResponse<GroupBuyResponse> start(@PathVariable Long id) {
+        return ApiResponse.ok(groupBuyService.start(id));
+    }
+
+    @PutMapping("/api/admin/group-buys/{id}/close")
+    @RequireRole({"PLATFORM_ADMIN", "COMMUNITY_ADMIN", "MERCHANT"})
+    public ApiResponse<GroupBuyResponse> close(@PathVariable Long id) {
+        return ApiResponse.ok(groupBuyService.close(id));
+    }
+
+    @PutMapping("/api/admin/group-buys/{id}/complete")
+    @RequireRole({"PLATFORM_ADMIN", "COMMUNITY_ADMIN", "MERCHANT"})
+    public ApiResponse<GroupBuyResponse> completeGroupBuy(@PathVariable Long id) {
+        return ApiResponse.ok(groupBuyService.complete(id));
+    }
+
+    @GetMapping("/api/admin/group-buys/{id}/orders")
+    @RequireRole({"PLATFORM_ADMIN", "COMMUNITY_ADMIN", "MERCHANT"})
+    public ApiResponse<List<GroupBuyOrderResponse>> listOrders(@PathVariable Long id) {
+        return ApiResponse.ok(orderService.listByGroupBuy(id));
+    }
+
+    @GetMapping("/api/mini/group-buys")
+    public ApiResponse<List<GroupBuyResponse>> listMini() {
+        CurrentUser user = authService.currentUser();
+        return ApiResponse.ok(groupBuyService.listMini(user.getCommunityId()));
+    }
+
+    @GetMapping("/api/mini/group-buys/{id}")
+    public ApiResponse<GroupBuyResponse> detail(@PathVariable Long id) {
+        return ApiResponse.ok(groupBuyService.detail(id));
+    }
+
+    @PostMapping("/api/mini/group-buy-orders")
+    public ApiResponse<GroupBuyOrderResponse> createOrder(@Valid @RequestBody GroupBuyOrderRequest request) {
+        CurrentUser user = authService.currentUser();
+        request.setTenantId(user.getTenantId());
+        request.setCommunityId(user.getCommunityId());
+        return ApiResponse.ok(orderService.create(user.getUserId(), request));
+    }
+
+    @GetMapping("/api/mini/group-buy-orders")
+    public ApiResponse<List<GroupBuyOrderResponse>> listMine() {
+        CurrentUser user = authService.currentUser();
+        return ApiResponse.ok(orderService.listMine(user.getUserId()));
+    }
+
+    @GetMapping("/api/mini/group-buy-orders/{id}")
+    public ApiResponse<GroupBuyOrderResponse> orderDetail(@PathVariable Long id) {
+        return ApiResponse.ok(orderService.detail(id));
+    }
+
+    @PutMapping("/api/mini/group-buy-orders/{id}/cancel")
+    public ApiResponse<GroupBuyOrderResponse> cancel(@PathVariable Long id) {
+        return ApiResponse.ok(orderService.cancel(id));
+    }
+
+    @PutMapping("/api/mini/group-buy-orders/{id}/complete")
+    public ApiResponse<GroupBuyOrderResponse> completeOrder(@PathVariable Long id) {
+        return ApiResponse.ok(orderService.complete(id));
+    }
+}

backend/src/main/java/com/linhelp/groupbuy/GroupBuyOrderRequest.java

@@ -0,0 +1,80 @@
+package com.linhelp.groupbuy;
+
+import com.linhelp.common.enums.DeliveryMethod;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+
+public class GroupBuyOrderRequest {
+    private Long tenantId;
+    private Long communityId;
+
+    @NotNull
+    private Long groupBuyId;
+
+    private Long addressId;
+
+    @Min(1)
+    private int quantity;
+
+    @NotNull
+    private DeliveryMethod deliveryMethod = DeliveryMethod.IMMEDIATE;
+
+    private String remark;
+
+    public Long getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(Long tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public Long getCommunityId() {
+        return communityId;
+    }
+
+    public void setCommunityId(Long communityId) {
+        this.communityId = communityId;
+    }
+
+    public Long getGroupBuyId() {
+        return groupBuyId;
+    }
+
+    public void setGroupBuyId(Long groupBuyId) {
+        this.groupBuyId = groupBuyId;
+    }
+
+    public Long getAddressId() {
+        return addressId;
+    }
+
+    public void setAddressId(Long addressId) {
+        this.addressId = addressId;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    public DeliveryMethod getDeliveryMethod() {
+        return deliveryMethod;
+    }
+
+    public void setDeliveryMethod(DeliveryMethod deliveryMethod) {
+        this.deliveryMethod = deliveryMethod;
+    }
+
+    public String getRemark() {
+        return remark;
+    }
+
+    public void setRemark(String remark) {
+        this.remark = remark;
+    }
+}

backend/src/main/java/com/linhelp/groupbuy/GroupBuyOrderResponse.java

@@ -0,0 +1,172 @@
+package com.linhelp.groupbuy;
+
+import com.linhelp.common.enums.DeliveryMethod;
+import com.linhelp.common.enums.GroupBuyOrderStatus;
+import com.linhelp.common.enums.OfflinePayStatus;
+
+import java.time.LocalDateTime;
+
+public class GroupBuyOrderResponse {
+    private Long id;
+    private String orderNo;
+    private Long tenantId;
+    private Long communityId;
+    private Long userId;
+    private Long groupBuyId;
+    private String groupBuyTitle;
+    private String coverUrl;
+    private Long addressId;
+    private int quantity;
+    private int priceCent;
+    private int amountCent;
+    private DeliveryMethod deliveryMethod;
+    private GroupBuyOrderStatus status;
+    private OfflinePayStatus offlinePayStatus;
+    private String remark;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getOrderNo() {
+        return orderNo;
+    }
+
+    public void setOrderNo(String orderNo) {
+        this.orderNo = orderNo;
+    }
+
+    public Long getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(Long tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public Long getCommunityId() {
+        return communityId;
+    }
+
+    public void setCommunityId(Long communityId) {
+        this.communityId = communityId;
+    }
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Long userId) {
+        this.userId = userId;
+    }
+
+    public Long getGroupBuyId() {
+        return groupBuyId;
+    }
+
+    public void setGroupBuyId(Long groupBuyId) {
+        this.groupBuyId = groupBuyId;
+    }
+
+    public String getGroupBuyTitle() {
+        return groupBuyTitle;
+    }
+
+    public void setGroupBuyTitle(String groupBuyTitle) {
+        this.groupBuyTitle = groupBuyTitle;
+    }
+
+    public String getCoverUrl() {
+        return coverUrl;
+    }
+
+    public void setCoverUrl(String coverUrl) {
+        this.coverUrl = coverUrl;
+    }
+
+    public Long getAddressId() {
+        return addressId;
+    }
+
+    public void setAddressId(Long addressId) {
+        this.addressId = addressId;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    public int getPriceCent() {
+        return priceCent;
+    }
+
+    public void setPriceCent(int priceCent) {
+        this.priceCent = priceCent;
+    }
+
+    public int getAmountCent() {
+        return amountCent;
+    }
+
+    public void setAmountCent(int amountCent) {
+        this.amountCent = amountCent;
+    }
+
+    public DeliveryMethod getDeliveryMethod() {
+        return deliveryMethod;
+    }
+
+    public void setDeliveryMethod(DeliveryMethod deliveryMethod) {
+        this.deliveryMethod = deliveryMethod;
+    }
+
+    public GroupBuyOrderStatus getStatus() {
+        return status;
+    }
+
+    public void setStatus(GroupBuyOrderStatus status) {
+        this.status = status;
+    }
+
+    public OfflinePayStatus getOfflinePayStatus() {
+        return offlinePayStatus;
+    }
+
+    public void setOfflinePayStatus(OfflinePayStatus offlinePayStatus) {
+        this.offlinePayStatus = offlinePayStatus;
+    }
+
+    public String getRemark() {
+        return remark;
+    }
+
+    public void setRemark(String remark) {
+        this.remark = remark;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+}

backend/src/main/java/com/linhelp/groupbuy/GroupBuyOrderService.java

@@ -0,0 +1,158 @@
+package com.linhelp.groupbuy;
+
+import com.linhelp.common.enums.DeliveryMethod;
+import com.linhelp.common.enums.GroupBuyOrderStatus;
+import com.linhelp.common.enums.OfflinePayStatus;
+import com.linhelp.common.exception.BizException;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+
+@Service
+public class GroupBuyOrderService {
+    private final GroupBuyService groupBuyService;
+    private final AtomicLong ids = new AtomicLong(1L);
+    private final Map<Long, GroupBuyOrderResponse> orders = new LinkedHashMap<Long, GroupBuyOrderResponse>();
+
+    public GroupBuyOrderService(GroupBuyService groupBuyService) {
+        this.groupBuyService = groupBuyService;
+    }
+
+    public synchronized GroupBuyOrderResponse create(Long userId, GroupBuyOrderRequest request) {
+        if (request.getDeliveryMethod() != DeliveryMethod.SELF_PICKUP && request.getAddressId() == null) {
+            throw new BizException("配送地址不能为空");
+        }
+        GroupBuyResponse groupBuy = groupBuyService.reserveForOrder(request.getGroupBuyId(), request.getQuantity());
+        Long orderId = ids.getAndIncrement();
+        GroupBuyOrderResponse order = new GroupBuyOrderResponse();
+        order.setId(orderId);
+        order.setOrderNo("GB" + String.format("%08d", orderId));
+        order.setTenantId(request.getTenantId());
+        order.setCommunityId(request.getCommunityId());
+        order.setUserId(userId);
+        order.setGroupBuyId(groupBuy.getId());
+        order.setGroupBuyTitle(groupBuy.getTitle());
+        order.setCoverUrl(groupBuy.getCoverUrl());
+        order.setAddressId(request.getAddressId());
+        order.setQuantity(request.getQuantity());
+        order.setPriceCent(groupBuy.getPriceCent());
+        order.setAmountCent(groupBuy.getPriceCent() * request.getQuantity());
+        order.setDeliveryMethod(request.getDeliveryMethod());
+        order.setStatus(GroupBuyOrderStatus.PENDING_CONFIRM);
+        order.setOfflinePayStatus(OfflinePayStatus.UNPAID);
+        order.setRemark(request.getRemark());
+        order.setCreatedAt(LocalDateTime.now());
+        order.setUpdatedAt(order.getCreatedAt());
+        orders.put(order.getId(), order);
+        return copy(order);
+    }
+
+    public synchronized GroupBuyOrderResponse detail(Long id) {
+        return copy(require(id));
+    }
+
+    public synchronized List<GroupBuyOrderResponse> listMine(Long userId) {
+        List<GroupBuyOrderResponse> result = new ArrayList<GroupBuyOrderResponse>();
+        for (GroupBuyOrderResponse order : orders.values()) {
+            if (userId.equals(order.getUserId())) {
+                result.add(copy(order));
+            }
+        }
+        return result;
+    }
+
+    public synchronized List<GroupBuyOrderResponse> listByGroupBuy(Long groupBuyId) {
+        List<GroupBuyOrderResponse> result = new ArrayList<GroupBuyOrderResponse>();
+        for (GroupBuyOrderResponse order : orders.values()) {
+            if (groupBuyId.equals(order.getGroupBuyId())) {
+                result.add(copy(order));
+            }
+        }
+        return result;
+    }
+
+    public synchronized GroupBuyOrderResponse confirm(Long id) {
+        GroupBuyOrderResponse order = require(id);
+        move(order, GroupBuyOrderStatus.PENDING_CONFIRM, GroupBuyOrderStatus.CONFIRMED);
+        return copy(order);
+    }
+
+    public synchronized GroupBuyOrderResponse markReady(Long id) {
+        GroupBuyOrderResponse order = require(id);
+        GroupBuyOrderStatus target = DeliveryMethod.SELF_PICKUP.equals(order.getDeliveryMethod())
+                ? GroupBuyOrderStatus.PENDING_PICKUP
+                : GroupBuyOrderStatus.PENDING_DELIVERY;
+        move(order, GroupBuyOrderStatus.CONFIRMED, target);
+        return copy(order);
+    }
+
+    public synchronized GroupBuyOrderResponse markDelivering(Long id) {
+        GroupBuyOrderResponse order = require(id);
+        move(order, GroupBuyOrderStatus.PENDING_DELIVERY, GroupBuyOrderStatus.DELIVERING);
+        return copy(order);
+    }
+
+    public synchronized GroupBuyOrderResponse complete(Long id) {
+        GroupBuyOrderResponse order = require(id);
+        if (order.getStatus() != GroupBuyOrderStatus.PENDING_PICKUP && order.getStatus() != GroupBuyOrderStatus.DELIVERING) {
+            throw new BizException("订单状态不允许操作");
+        }
+        order.setStatus(GroupBuyOrderStatus.COMPLETED);
+        order.setUpdatedAt(LocalDateTime.now());
+        return copy(order);
+    }
+
+    public synchronized GroupBuyOrderResponse cancel(Long id) {
+        GroupBuyOrderResponse order = require(id);
+        if (order.getStatus() == GroupBuyOrderStatus.COMPLETED) {
+            throw new BizException("订单状态不允许操作");
+        }
+        order.setStatus(GroupBuyOrderStatus.CANCELED);
+        order.setUpdatedAt(LocalDateTime.now());
+        return copy(order);
+    }
+
+    private void move(GroupBuyOrderResponse order, GroupBuyOrderStatus expected, GroupBuyOrderStatus target) {
+        if (order.getStatus() != expected) {
+            throw new BizException("订单状态不允许操作");
+        }
+        order.setStatus(target);
+        order.setUpdatedAt(LocalDateTime.now());
+    }
+
+    private GroupBuyOrderResponse require(Long id) {
+        GroupBuyOrderResponse order = orders.get(id);
+        if (order == null) {
+            throw new BizException(404, "团购订单不存在");
+        }
+        return order;
+    }
+
+    private GroupBuyOrderResponse copy(GroupBuyOrderResponse source) {
+        GroupBuyOrderResponse target = new GroupBuyOrderResponse();
+        target.setId(source.getId());
+        target.setOrderNo(source.getOrderNo());
+        target.setTenantId(source.getTenantId());
+        target.setCommunityId(source.getCommunityId());
+        target.setUserId(source.getUserId());
+        target.setGroupBuyId(source.getGroupBuyId());
+        target.setGroupBuyTitle(source.getGroupBuyTitle());
+        target.setCoverUrl(source.getCoverUrl());
+        target.setAddressId(source.getAddressId());
+        target.setQuantity(source.getQuantity());
+        target.setPriceCent(source.getPriceCent());
+        target.setAmountCent(source.getAmountCent());
+        target.setDeliveryMethod(source.getDeliveryMethod());
+        target.setStatus(source.getStatus());
+        target.setOfflinePayStatus(source.getOfflinePayStatus());
+        target.setRemark(source.getRemark());
+        target.setCreatedAt(source.getCreatedAt());
+        target.setUpdatedAt(source.getUpdatedAt());
+        return target;
+    }
+}

backend/src/main/java/com/linhelp/groupbuy/GroupBuyRequest.java

@@ -0,0 +1,121 @@
+package com.linhelp.groupbuy;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
+import java.time.LocalDateTime;
+
+public class GroupBuyRequest {
+    private Long tenantId;
+    private Long communityId;
+
+    @NotBlank
+    private String title;
+
+    private String coverUrl;
+    private String description;
+
+    @Min(0)
+    private int priceCent;
+
+    private Integer originPriceCent;
+
+    @Min(0)
+    private int stock;
+
+    @NotNull
+    private LocalDateTime startTime;
+
+    @NotNull
+    private LocalDateTime endTime;
+
+    private String pickupAddress;
+
+    public Long getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(Long tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public Long getCommunityId() {
+        return communityId;
+    }
+
+    public void setCommunityId(Long communityId) {
+        this.communityId = communityId;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getCoverUrl() {
+        return coverUrl;
+    }
+
+    public void setCoverUrl(String coverUrl) {
+        this.coverUrl = coverUrl;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public int getPriceCent() {
+        return priceCent;
+    }
+
+    public void setPriceCent(int priceCent) {
+        this.priceCent = priceCent;
+    }
+
+    public Integer getOriginPriceCent() {
+        return originPriceCent;
+    }
+
+    public void setOriginPriceCent(Integer originPriceCent) {
+        this.originPriceCent = originPriceCent;
+    }
+
+    public int getStock() {
+        return stock;
+    }
+
+    public void setStock(int stock) {
+        this.stock = stock;
+    }
+
+    public LocalDateTime getStartTime() {
+        return startTime;
+    }
+
+    public void setStartTime(LocalDateTime startTime) {
+        this.startTime = startTime;
+    }
+
+    public LocalDateTime getEndTime() {
+        return endTime;
+    }
+
+    public void setEndTime(LocalDateTime endTime) {
+        this.endTime = endTime;
+    }
+
+    public String getPickupAddress() {
+        return pickupAddress;
+    }
+
+    public void setPickupAddress(String pickupAddress) {
+        this.pickupAddress = pickupAddress;
+    }
+}

backend/src/main/java/com/linhelp/groupbuy/GroupBuyResponse.java

@@ -0,0 +1,132 @@
+package com.linhelp.groupbuy;
+
+import java.time.LocalDateTime;
+
+public class GroupBuyResponse {
+    private Long id;
+    private Long tenantId;
+    private Long communityId;
+    private String title;
+    private String coverUrl;
+    private String description;
+    private int priceCent;
+    private Integer originPriceCent;
+    private int stock;
+    private int soldCount;
+    private String status;
+    private LocalDateTime startTime;
+    private LocalDateTime endTime;
+    private String pickupAddress;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(Long tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public Long getCommunityId() {
+        return communityId;
+    }
+
+    public void setCommunityId(Long communityId) {
+        this.communityId = communityId;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getCoverUrl() {
+        return coverUrl;
+    }
+
+    public void setCoverUrl(String coverUrl) {
+        this.coverUrl = coverUrl;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public int getPriceCent() {
+        return priceCent;
+    }
+
+    public void setPriceCent(int priceCent) {
+        this.priceCent = priceCent;
+    }
+
+    public Integer getOriginPriceCent() {
+        return originPriceCent;
+    }
+
+    public void setOriginPriceCent(Integer originPriceCent) {
+        this.originPriceCent = originPriceCent;
+    }
+
+    public int getStock() {
+        return stock;
+    }
+
+    public void setStock(int stock) {
+        this.stock = stock;
+    }
+
+    public int getSoldCount() {
+        return soldCount;
+    }
+
+    public void setSoldCount(int soldCount) {
+        this.soldCount = soldCount;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public LocalDateTime getStartTime() {
+        return startTime;
+    }
+
+    public void setStartTime(LocalDateTime startTime) {
+        this.startTime = startTime;
+    }
+
+    public LocalDateTime getEndTime() {
+        return endTime;
+    }
+
+    public void setEndTime(LocalDateTime endTime) {
+        this.endTime = endTime;
+    }
+
+    public String getPickupAddress() {
+        return pickupAddress;
+    }
+
+    public void setPickupAddress(String pickupAddress) {
+        this.pickupAddress = pickupAddress;
+    }
+}

backend/src/main/java/com/linhelp/groupbuy/GroupBuyService.java

@@ -0,0 +1,141 @@
+package com.linhelp.groupbuy;
+
+import com.linhelp.common.exception.BizException;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+
+@Service
+public class GroupBuyService {
+    public static final String STATUS_DRAFT = "DRAFT";
+    public static final String STATUS_ONGOING = "ONGOING";
+    public static final String STATUS_CLOSED = "CLOSED";
+    public static final String STATUS_COMPLETED = "COMPLETED";
+
+    private final AtomicLong ids = new AtomicLong(1L);
+    private final Map<Long, GroupBuyResponse> groupBuys = new LinkedHashMap<Long, GroupBuyResponse>();
+
+    public synchronized GroupBuyResponse create(GroupBuyRequest request) {
+        GroupBuyResponse groupBuy = new GroupBuyResponse();
+        groupBuy.setId(ids.getAndIncrement());
+        groupBuy.setTenantId(request.getTenantId());
+        groupBuy.setCommunityId(request.getCommunityId());
+        copyFields(request, groupBuy);
+        groupBuy.setStatus(STATUS_DRAFT);
+        groupBuys.put(groupBuy.getId(), groupBuy);
+        return copy(groupBuy);
+    }
+
+    public synchronized GroupBuyResponse update(Long id, GroupBuyRequest request) {
+        GroupBuyResponse groupBuy = require(id);
+        if (request.getTenantId() != null) {
+            groupBuy.setTenantId(request.getTenantId());
+        }
+        if (request.getCommunityId() != null) {
+            groupBuy.setCommunityId(request.getCommunityId());
+        }
+        copyFields(request, groupBuy);
+        return copy(groupBuy);
+    }
+
+    public synchronized GroupBuyResponse start(Long id) {
+        GroupBuyResponse groupBuy = require(id);
+        groupBuy.setStatus(STATUS_ONGOING);
+        return copy(groupBuy);
+    }
+
+    public synchronized GroupBuyResponse close(Long id) {
+        GroupBuyResponse groupBuy = require(id);
+        groupBuy.setStatus(STATUS_CLOSED);
+        return copy(groupBuy);
+    }
+
+    public synchronized GroupBuyResponse complete(Long id) {
+        GroupBuyResponse groupBuy = require(id);
+        groupBuy.setStatus(STATUS_COMPLETED);
+        return copy(groupBuy);
+    }
+
+    public synchronized GroupBuyResponse detail(Long id) {
+        return copy(require(id));
+    }
+
+    public synchronized List<GroupBuyResponse> listAdmin(Long communityId) {
+        List<GroupBuyResponse> result = new ArrayList<GroupBuyResponse>();
+        for (GroupBuyResponse groupBuy : groupBuys.values()) {
+            if (communityId.equals(groupBuy.getCommunityId())) {
+                result.add(copy(groupBuy));
+            }
+        }
+        return result;
+    }
+
+    public synchronized List<GroupBuyResponse> listMini(Long communityId) {
+        List<GroupBuyResponse> result = new ArrayList<GroupBuyResponse>();
+        for (GroupBuyResponse groupBuy : groupBuys.values()) {
+            if (communityId.equals(groupBuy.getCommunityId()) && STATUS_ONGOING.equals(groupBuy.getStatus())) {
+                result.add(copy(groupBuy));
+            }
+        }
+        return result;
+    }
+
+    public synchronized GroupBuyResponse reserveForOrder(Long id, int quantity) {
+        if (quantity <= 0) {
+            throw new BizException("购买数量必须大于0");
+        }
+        GroupBuyResponse groupBuy = require(id);
+        if (!STATUS_ONGOING.equals(groupBuy.getStatus()) || LocalDateTime.now().isAfter(groupBuy.getEndTime())) {
+            throw new BizException("团购已截单");
+        }
+        if (groupBuy.getSoldCount() + quantity > groupBuy.getStock()) {
+            throw new BizException("团购库存不足");
+        }
+        groupBuy.setSoldCount(groupBuy.getSoldCount() + quantity);
+        return copy(groupBuy);
+    }
+
+    private GroupBuyResponse require(Long id) {
+        GroupBuyResponse groupBuy = groupBuys.get(id);
+        if (groupBuy == null) {
+            throw new BizException(404, "团购不存在");
+        }
+        return groupBuy;
+    }
+
+    private void copyFields(GroupBuyRequest request, GroupBuyResponse groupBuy) {
+        groupBuy.setTitle(request.getTitle());
+        groupBuy.setCoverUrl(request.getCoverUrl());
+        groupBuy.setDescription(request.getDescription());
+        groupBuy.setPriceCent(request.getPriceCent());
+        groupBuy.setOriginPriceCent(request.getOriginPriceCent());
+        groupBuy.setStock(request.getStock());
+        groupBuy.setStartTime(request.getStartTime());
+        groupBuy.setEndTime(request.getEndTime());
+        groupBuy.setPickupAddress(request.getPickupAddress());
+    }
+
+    private GroupBuyResponse copy(GroupBuyResponse source) {
+        GroupBuyResponse target = new GroupBuyResponse();
+        target.setId(source.getId());
+        target.setTenantId(source.getTenantId());
+        target.setCommunityId(source.getCommunityId());
+        target.setTitle(source.getTitle());
+        target.setCoverUrl(source.getCoverUrl());
+        target.setDescription(source.getDescription());
+        target.setPriceCent(source.getPriceCent());
+        target.setOriginPriceCent(source.getOriginPriceCent());
+        target.setStock(source.getStock());
+        target.setSoldCount(source.getSoldCount());
+        target.setStatus(source.getStatus());
+        target.setStartTime(source.getStartTime());
+        target.setEndTime(source.getEndTime());
+        target.setPickupAddress(source.getPickupAddress());
+        return target;
+    }
+}