package com.ecommerce.controller;

import com.ecommerce.dto.request.CategoryRequest;
import com.ecommerce.dto.request.ProductRequest;
import com.ecommerce.dto.response.ApiResponse;
import com.ecommerce.dto.response.CategoryResponse;
import com.ecommerce.dto.response.DashboardStatsResponse;
import com.ecommerce.dto.response.OrderResponse;
import com.ecommerce.dto.response.ProductResponse;
import com.ecommerce.dto.response.UserResponse;
import com.ecommerce.model.Order;
import com.ecommerce.service.CategoryService;
import com.ecommerce.service.DashboardService;
import com.ecommerce.service.OrderService;
import com.ecommerce.service.ProductService;
import com.ecommerce.service.UserService;
import jakarta.validation.Valid;
import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/api/admin")
@PreAuthorize("hasRole('ADMIN')")
@RequiredArgsConstructor
public class AdminController {
    
    private final ProductService productService;
    private final CategoryService categoryService;
    private final OrderService orderService;
    private final UserService userService;
    private final DashboardService dashboardService;
    
    // ========== Dashboard ==========
    
    @GetMapping("/dashboard/stats")
    public ResponseEntity<ApiResponse<DashboardStatsResponse>> getDashboardStats() {
        DashboardStatsResponse stats = dashboardService.getDashboardStats();
        return ResponseEntity.ok(ApiResponse.success(stats));
    }
    
    // ========== Product Management ==========
    
    @GetMapping("/products")
    public ResponseEntity<ApiResponse<Page<ProductResponse>>> getAllProducts(
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size) {
        
        Page<ProductResponse> products = productService.getAllProductsAdmin(
                PageRequest.of(page, size, Sort.by("createdAt").descending()));
        return ResponseEntity.ok(ApiResponse.success(products));
    }
    
    @PostMapping("/products")
    public ResponseEntity<ApiResponse<ProductResponse>> createProduct(@Valid @RequestBody ProductRequest request) {
        ProductResponse product = productService.createProduct(request);
        return ResponseEntity.ok(ApiResponse.success("Product created successfully", product));
    }
    
    @PutMapping("/products/{id}")
    public ResponseEntity<ApiResponse<ProductResponse>> updateProduct(
            @PathVariable String id,
            @RequestBody ProductRequest request) {
        ProductResponse product = productService.updateProduct(id, request);
        return ResponseEntity.ok(ApiResponse.success("Product updated successfully", product));
    }
    
    @DeleteMapping("/products/{id}")
    public ResponseEntity<ApiResponse<Void>> deleteProduct(@PathVariable String id) {
        productService.deleteProduct(id);
        return ResponseEntity.ok(ApiResponse.success("Product deleted successfully", null));
    }
    
    // ========== Category Management ==========
    
    @PostMapping("/categories")
    public ResponseEntity<ApiResponse<CategoryResponse>> createCategory(@Valid @RequestBody CategoryRequest request) {
        CategoryResponse category = categoryService.createCategory(request);
        return ResponseEntity.ok(ApiResponse.success("Category created successfully", category));
    }
    
    @PutMapping("/categories/{id}")
    public ResponseEntity<ApiResponse<CategoryResponse>> updateCategory(
            @PathVariable String id,
            @RequestBody CategoryRequest request) {
        CategoryResponse category = categoryService.updateCategory(id, request);
        return ResponseEntity.ok(ApiResponse.success("Category updated successfully", category));
    }
    
    @DeleteMapping("/categories/{id}")
    public ResponseEntity<ApiResponse<Void>> deleteCategory(@PathVariable String id) {
        categoryService.deleteCategory(id);
        return ResponseEntity.ok(ApiResponse.success("Category deleted successfully", null));
    }
    
    // ========== Order Management ==========
    
    @GetMapping("/orders")
    public ResponseEntity<ApiResponse<Page<OrderResponse>>> getAllOrders(
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size) {
        
        Page<OrderResponse> orders = orderService.getAllOrders(
                PageRequest.of(page, size, Sort.by("createdAt").descending()));
        return ResponseEntity.ok(ApiResponse.success(orders));
    }
    
    @GetMapping("/orders/{id}")
    public ResponseEntity<ApiResponse<OrderResponse>> getOrderById(@PathVariable String id) {
        OrderResponse order = orderService.getOrderByIdAdmin(id);
        return ResponseEntity.ok(ApiResponse.success(order));
    }
    
    @GetMapping("/orders/status/{status}")
    public ResponseEntity<ApiResponse<Page<OrderResponse>>> getOrdersByStatus(
            @PathVariable String status,
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size) {
        
        Order.OrderStatus orderStatus = Order.OrderStatus.valueOf(status.toUpperCase());
        Page<OrderResponse> orders = orderService.getOrdersByStatus(orderStatus,
                PageRequest.of(page, size, Sort.by("createdAt").descending()));
        return ResponseEntity.ok(ApiResponse.success(orders));
    }
    
    @PutMapping("/orders/{id}/status")
    public ResponseEntity<ApiResponse<OrderResponse>> updateOrderStatus(
            @PathVariable String id,
            @RequestParam String status) {
        OrderResponse order = orderService.updateOrderStatus(id, status);
        return ResponseEntity.ok(ApiResponse.success("Order status updated", order));
    }
    
    @PutMapping("/orders/{id}/tracking")
    public ResponseEntity<ApiResponse<OrderResponse>> updateTrackingNumber(
            @PathVariable String id,
            @RequestParam String trackingNumber) {
        OrderResponse order = orderService.updateTrackingNumber(id, trackingNumber);
        return ResponseEntity.ok(ApiResponse.success("Tracking number updated", order));
    }
    
    // ========== User Management ==========
    
    @GetMapping("/users")
    public ResponseEntity<ApiResponse<Page<UserResponse>>> getAllUsers(
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size) {
        
        Page<UserResponse> users = userService.getAllUsers(
                PageRequest.of(page, size, Sort.by("createdAt").descending()));
        return ResponseEntity.ok(ApiResponse.success(users));
    }
    
    @GetMapping("/users/{id}")
    public ResponseEntity<ApiResponse<UserResponse>> getUserById(@PathVariable String id) {
        UserResponse user = userService.getUserById(id);
        return ResponseEntity.ok(ApiResponse.success(user));
    }
    
    @PutMapping("/users/{id}/toggle-status")
    public ResponseEntity<ApiResponse<Void>> toggleUserStatus(@PathVariable String id) {
        userService.toggleUserStatus(id);
        return ResponseEntity.ok(ApiResponse.success("User status updated", null));
    }
    
    @PutMapping("/users/{id}/role")
    public ResponseEntity<ApiResponse<UserResponse>> updateUserRole(
            @PathVariable String id,
            @RequestParam String role) {
        UserResponse user = userService.updateUserRole(id, role);
        return ResponseEntity.ok(ApiResponse.success("User role updated", user));
    }
    
    @PutMapping("/users/{id}/activate")
    public ResponseEntity<ApiResponse<Void>> activateUser(@PathVariable String id) {
        userService.activateUser(id);
        return ResponseEntity.ok(ApiResponse.success("User activated", null));
    }
    
    @PutMapping("/users/{id}/deactivate")
    public ResponseEntity<ApiResponse<Void>> deactivateUser(@PathVariable String id) {
        userService.deactivateUser(id);
        return ResponseEntity.ok(ApiResponse.success("User deactivated", null));
    }
}