{
  "openapi": "3.0.3",
  "info": {
    "title": "OpenGoods / 天工商品档案公共仓 API",
    "version": "1.0.0",
    "description": "Public, read-only product-facts REST API. Anonymous access is allowed at a lower per-minute rate; an optional API key grants a higher rate limit and attributes usage. No purchase or commerce endpoints by design.",
    "license": { "name": "Data under each source's license (e.g. ODbL)" }
  },
  "servers": [{ "url": "https://goods.tangshasha.com/api/v1" }],
  "tags": [
    { "name": "products" },
    { "name": "catalog" },
    { "name": "meta" },
    { "name": "account" }
  ],
  "security": [{ "ApiKeyHeader": [] }, { "BearerKey": [] }, {}],
  "paths": {
    "/products/search": {
      "get": {
        "tags": ["products"],
        "summary": "Search products",
        "description": "Trigram-fuzzy name search (typo-tolerant) with optional category/brand/country filters, ranked by name similarity blended with data quality_score.",
        "parameters": [
          { "name": "q", "in": "query", "schema": { "type": "string" }, "description": "Keyword (name or barcode); fuzzy-matched. Empty returns all, ordered by quality_score." },
          { "name": "category", "in": "query", "schema": { "type": "string" }, "description": "Category code (matches the subtree), e.g. food.beverages." },
          { "name": "brand", "in": "query", "schema": { "type": "string" }, "description": "Brand name (fuzzy)." },
          { "name": "country", "in": "query", "schema": { "type": "string" }, "description": "Country of origin (case-insensitive prefix)." },
          { "name": "page", "in": "query", "schema": { "type": "integer", "default": 1, "minimum": 1 } },
          { "name": "size", "in": "query", "schema": { "type": "integer", "default": 20, "maximum": 100 } }
        ],
        "responses": {
          "200": {
            "description": "Paged search results.",
            "headers": {
              "X-RateLimit-Limit": { "schema": { "type": "integer" }, "description": "Max requests in the current window." },
              "X-RateLimit-Remaining": { "schema": { "type": "integer" }, "description": "Remaining requests in the window." },
              "X-RateLimit-Reset": { "schema": { "type": "integer" }, "description": "Unix timestamp when the window resets." }
            },
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "items": { "type": "array", "items": { "$ref": "#/components/schemas/ProductSummary" } },
                    "page": { "type": "integer" },
                    "size": { "type": "integer" },
                    "total": { "type": "integer" }
                  }
                }
              }
            }
          },
          "401": { "$ref": "#/components/responses/InvalidApiKey" },
          "429": { "$ref": "#/components/responses/RateLimited" }
        }
      }
    },
    "/products/barcode/{gtin}": {
      "get": {
        "tags": ["products"],
        "summary": "Get product by barcode (GTIN)",
        "parameters": [{ "name": "gtin", "in": "path", "required": true, "schema": { "type": "string" } }],
        "responses": {
          "200": { "description": "Product", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Product" } } } },
          "404": { "$ref": "#/components/responses/NotFound" },
          "429": { "$ref": "#/components/responses/RateLimited" }
        }
      }
    },
    "/products/{id}": {
      "get": {
        "tags": ["products"],
        "summary": "Get product detail by UUID",
        "parameters": [{ "name": "id", "in": "path", "required": true, "schema": { "type": "string", "format": "uuid" } }],
        "responses": {
          "200": { "description": "Product", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Product" } } } },
          "404": { "$ref": "#/components/responses/NotFound" }
        }
      }
    },
    "/products/{id}/nutriments": {
      "get": {
        "tags": ["products"],
        "summary": "Get product nutriments",
        "parameters": [{ "name": "id", "in": "path", "required": true, "schema": { "type": "string", "format": "uuid" } }],
        "responses": { "200": { "description": "Nutriments" }, "404": { "$ref": "#/components/responses/NotFound" } }
      }
    },
    "/products/{id}/msrp": {
      "get": {
        "tags": ["products"],
        "summary": "Get manufacturer suggested retail price snapshots (reference only)",
        "parameters": [{ "name": "id", "in": "path", "required": true, "schema": { "type": "string", "format": "uuid" } }],
        "responses": { "200": { "description": "MSRP snapshots" } }
      }
    },
    "/brands": {
      "get": {
        "tags": ["catalog"],
        "summary": "List brands",
        "parameters": [
          { "name": "page", "in": "query", "schema": { "type": "integer", "default": 1 } },
          { "name": "size", "in": "query", "schema": { "type": "integer", "default": 20, "maximum": 100 } }
        ],
        "responses": { "200": { "description": "Paged brands" } }
      }
    },
    "/categories": {
      "get": { "tags": ["catalog"], "summary": "List the category tree", "responses": { "200": { "description": "Category tree" } } }
    },
    "/sources/{id}": {
      "get": {
        "tags": ["meta"],
        "summary": "Get a data source",
        "parameters": [{ "name": "id", "in": "path", "required": true, "schema": { "type": "string", "format": "uuid" } }],
        "responses": { "200": { "description": "Source" }, "404": { "$ref": "#/components/responses/NotFound" } }
      }
    },
    "/register": {
      "post": {
        "tags": ["account"],
        "summary": "Register an account and issue an API key",
        "description": "Self-service registration; returns the plaintext API key exactly once.",
        "security": [],
        "requestBody": { "required": true, "content": { "application/json": { "schema": { "type": "object", "required": ["email", "password"], "properties": { "email": { "type": "string", "format": "email" }, "password": { "type": "string", "minLength": 8 } } } } } },
        "responses": { "201": { "description": "Account created; plaintext key returned once" }, "400": { "description": "Invalid email or weak password" }, "409": { "description": "Email already registered" } }
      }
    },
    "/account": {
      "post": {
        "tags": ["account"],
        "summary": "View account key metadata and cumulative quota usage",
        "security": [],
        "requestBody": { "required": true, "content": { "application/json": { "schema": { "type": "object", "required": ["email", "password"], "properties": { "email": { "type": "string", "format": "email" }, "password": { "type": "string" } } } } } },
        "responses": { "200": { "description": "Account info with quota usage" }, "401": { "description": "Invalid credentials" } }
      }
    },
    "/account/regenerate": {
      "post": {
        "tags": ["account"],
        "summary": "Revoke the current key and issue a new one",
        "description": "Cumulative usage carries over; returns the plaintext key exactly once.",
        "security": [],
        "requestBody": { "required": true, "content": { "application/json": { "schema": { "type": "object", "required": ["email", "password"], "properties": { "email": { "type": "string", "format": "email" }, "password": { "type": "string" } } } } } },
        "responses": { "200": { "description": "New plaintext key returned once" }, "401": { "description": "Invalid credentials" } }
      }
    }
  },
  "components": {
    "securitySchemes": {
      "ApiKeyHeader": { "type": "apiKey", "in": "header", "name": "X-API-Key", "description": "API key, e.g. og_live_xxx. Optional." },
      "BearerKey": { "type": "http", "scheme": "bearer", "description": "Authorization: Bearer og_live_xxx. Optional." }
    },
    "responses": {
      "NotFound": {
        "description": "Resource not found.",
        "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } }
      },
      "RateLimited": {
        "description": "Rate limit exceeded.",
        "headers": { "Retry-After": { "schema": { "type": "integer" }, "description": "Seconds to wait before retrying." } },
        "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } }
      },
      "InvalidApiKey": {
        "description": "API key invalid or revoked.",
        "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } }
      }
    },
    "schemas": {
      "Error": {
        "type": "object",
        "properties": {
          "error": {
            "type": "object",
            "properties": {
              "code": { "type": "string" },
              "message": { "type": "string" },
              "request_id": { "type": "string" }
            }
          }
        }
      },
      "ProductSummary": {
        "type": "object",
        "properties": {
          "id": { "type": "string", "format": "uuid" },
          "gtin": { "type": "string", "nullable": true },
          "name": { "type": "string" },
          "brand": { "type": "string", "nullable": true },
          "category_path": { "type": "string", "nullable": true },
          "country_of_origin": { "type": "string", "nullable": true },
          "quality_score": { "type": "number", "format": "float" },
          "score": { "type": "number", "format": "float", "nullable": true, "description": "Relevance (name word-similarity) when q is provided; null otherwise." }
        }
      },
      "Product": {
        "type": "object",
        "properties": {
          "id": { "type": "string", "format": "uuid" },
          "gtin": { "type": "string", "nullable": true },
          "name": { "type": "string" },
          "brand": { "type": "string", "nullable": true },
          "category_path": { "type": "string", "nullable": true },
          "net_content_value": { "type": "number", "nullable": true },
          "net_content_unit": { "type": "string", "nullable": true },
          "country_of_origin": { "type": "string", "nullable": true },
          "quality_score": { "type": "number", "format": "float" },
          "nutriments": { "type": "object", "additionalProperties": true, "nullable": true },
          "nutrition_basis": { "type": "string", "nullable": true },
          "nutri_score": { "type": "string", "nullable": true },
          "ingredients_text": { "type": "string", "nullable": true }
        }
      }
    }
  }
}