package alicloud

import (
	"regexp"

	"github.com/aliyun/alibaba-cloud-sdk-go/sdk/requests"
	"github.com/hashicorp/terraform-plugin-sdk/helper/validation"

	"strconv"
	"strings"

	"github.com/aliyun/alibaba-cloud-sdk-go/services/market"
	"github.com/aliyun/terraform-provider-alicloud/alicloud/connectivity"
	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
)

func dataSourceAlicloudProducts() *schema. Resource {
	return &schema. Resource{
		Read: dataSourceAlicloudProductsRead,

		Schema: map[string]*schema. Schema{
			"name_regex": {
				Type:         schema. TypeString,
				Optional:     true,
				ValidateFunc: validation. ValidateRegexp,
			},

			"sort": {
				Type:         schema. TypeString,
				Optional:     true,
				ForceNew:     true,
				ValidateFunc: validation. StringInSlice([]string{"user_count-desc", "created_on-desc", "price-desc", "score-desc"}, false),
			},

			"category_id": {
				Type:     schema. TypeString,
				Optional: true,
				ForceNew: true,
			},

			"product_type": {
				Type:         schema. TypeString,
				Optional:     true,
				ForceNew:     true,
				ValidateFunc: validation. StringInSlice([]string{"APP", "SERVICE", "MIRROR", "DOWNLOAD", "API_SERVICE"}, false),
			},

			"search_term": {
				Type:     schema. TypeString,
				Optional: true,
				ForceNew: true,
			},
			"supplier_id": {
				Type:     schema. TypeString,
				Optional: true,
				ForceNew: true,
			},
			"supplier_name_keyword": {
				Type:     schema. TypeString,
				Optional: true,
				ForceNew: true,
			},
			"suggested_price": {
				Type:     schema. TypeFloat,
				Optional: true,
				ForceNew: true,
			},
			"output_file": {
				Type:     schema. TypeString,
				Optional: true,
			},
			"ids": {
				Type:     schema. TypeList,
				Optional: true,
				Computed: true,
				Elem:     &schema. Schema{Type: schema. TypeString},
			},
			// Computed values. 
			"products": {
				Type:     schema. TypeList,
				Computed: true,
				Elem: &schema. Resource{
					Schema: map[string]*schema. Schema{
						"code": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"name": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"category_id": {
							Type:     schema. TypeInt,
							Computed: true,
						},
						"supplier_id": {
							Type:     schema. TypeInt,
							Computed: true,
						},
						"supplier_name": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"short_description": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"tags": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"suggested_price": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"target_url": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"image_url": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"score": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"operation_system": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"warranty_date": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"delivery_date": {
							Type:     schema. TypeString,
							Computed: true,
						},
						"delivery_way": {
							Type:     schema. TypeString,
							Computed: true,
						},
					},
				},
			},
		},
	}
}

func dataSourceAlicloudProductsRead(d *schema. ResourceData, meta interface{}) error {
	client := meta.(*connectivity. AliyunClient)
	request := market. CreateDescribeProductsRequest()
	request. RegionId = client. RegionId
	var productsFilter []market. DescribeProductsFilter
	var product market. DescribeProductsFilter
	var nameRegex *regexp. Regexp
	if v, ok := d.GetOk("name_regex"); ok {
		if r, err := regexp. Compile(v.(string)); err == nil {
			nameRegex = r
		}
	}
	idsMap := make(map[string]string)
	if v, ok := d.GetOk("ids"); ok {
		for _, vv := range v.([]interface{}) {
			idsMap[vv.(string)] = vv.(string)
		}
	}
	if v, ok := d.GetOk("sort"); ok && v.(string) ! = "" {
		product. Key = "sort"
		product. Value = v.(string)
		productsFilter = append(productsFilter, product)
	}
	if v, ok := d.GetOk("category_id"); ok && v.(string) ! = "" {
		product. Key = "categoryId"
		product. Value = v.(string)
		productsFilter = append(productsFilter, product)
	}
	if v, ok := d.GetOk("product_type"); ok && v.(string) ! = "" {
		product. Key = "productType"
		product. Value = v.(string)
		productsFilter = append(productsFilter, product)
	}
	if v, ok := d.GetOk("search_term"); ok && v.(string) ! = "" {
		request. SearchTerm = v.(string)
	}

	supplierId := d.Get("supplier_id").(string)
	supplierNameKeyword := d.Get("supplier_name_keyword").(string)
	suggestedPrice, suggestedPriceOk := d.GetOkExists("suggested_price")

	request. Filter = &productsFilter
	request. PageSize = requests. NewInteger(PageSizeLarge)
	request. PageNumber = requests. NewInteger(1)
	var allProduct []market. ProductItem
	for {
		raw, err := client. WithMarketClient(func(marketClient *market. Client) (interface{}, error) {
			return marketClient. DescribeProducts(request)
		})
		if err ! = nil {
			return WrapErrorf(err, DataDefaultErrorMsg, "alicloud_market_products", request. GetActionName(), AlibabaCloudSdkGoERROR)
		}
		addDebug(request. GetActionName(), raw, request. RpcRequest, request)
		response, _ := raw.(*market. DescribeProductsResponse)

		if len(response. ProductItems. ProductItem) < 1 {
			break
		}

		for _, item := range response. ProductItems. ProductItem {
			if nameRegex ! = nil {
				if ! nameRegex. MatchString(item. Name) {
					continue
				}
			}
			if len(idsMap) > 0 {
				if _, ok := idsMap[item. Code]; ! ok {
					continue
				}
			}
			if supplierId ! = "" && supplierId ! = strconv. FormatInt(item. SupplierId, 10) {
				continue
			}

			if supplierNameKeyword ! = "" && ! strings. Contains(item. SupplierName, supplierNameKeyword) {
				continue
			}

			if suggestedPriceOk && ! strings. HasPrefix(item. SuggestedPrice, strconv. FormatFloat(suggestedPrice.(float64), 'f', -1, 64)) {
				continue
			}

			allProduct = append(allProduct, item)
		}

		if len(response. ProductItems. ProductItem) < PageSizeLarge {
			break
		}

		page, err := getNextpageNumber(request. PageNumber)
		if err ! = nil {
			return WrapError(err)
		}
		request. PageNumber = page
	}

	return productsDescriptionAttributes(d, allProduct)
}

func productsDescriptionAttributes(d *schema. ResourceData, allProduct []market. ProductItem) error {
	var ids []string
	var s []map[string]interface{}
	for _, p := range allProduct {
		mapping := map[string]interface{}{
			"code":              p.Code,
			"name":              p.Name,
			"category_id":       p.CategoryId,
			"supplier_id":       p.SupplierId,
			"supplier_name":     p.SupplierName,
			"short_description": p. ShortDescription,
			"tags":              p.Tags,
			"suggested_price":   p.SuggestedPrice,
			"target_url":        p.TargetUrl,
			"image_url":         p.ImageUrl,
			"score":             p.Score,
			"operation_system":  p.OperationSystem,
			"warranty_date":     p.WarrantyDate,
			"delivery_date":     p.DeliveryDate,
			"delivery_way":      p.DeliveryWay,
		}

		ids = append(ids, p.Code)
		s = append(s, mapping)
	}

	d.SetId(dataResourceIdHash(ids))
	if err := d.Set("products", s); err ! = nil {
		return err
	}
	if err := d.Set("ids", ids); err ! = nil {
		return err
	}

	// create a json file in current directory and write data source to it. 
	if output, ok := d.GetOk("output_file"); ok && output.(string) ! = "" {
		writeToFile(output.(string), s)
	}
	return nil
}
