/**
 * Schemas JSON para validación de respuestas NLU
 */

import Ajv from "ajv";

const ajv = new Ajv({ allErrors: true, strict: true });

// ─────────────────────────────────────────────────────────────
// Schema: Router
// ─────────────────────────────────────────────────────────────

export const RouterSchema = {
  $id: "Router",
  type: "object",
  additionalProperties: false,
  required: ["domain"],
  properties: {
    domain: {
      type: "string",
      enum: ["greeting", "orders", "shipping", "payment", "browse", "other"],
    },
  },
};

export const validateRouter = ajv.compile(RouterSchema);

// ─────────────────────────────────────────────────────────────
// Schema: Greeting
// ─────────────────────────────────────────────────────────────

export const GreetingSchema = {
  $id: "Greeting",
  type: "object",
  additionalProperties: false,
  required: ["intent", "reply"],
  properties: {
    intent: { type: "string", enum: ["greeting"] },
    reply: { type: "string", minLength: 1 },
  },
};

export const validateGreeting = ajv.compile(GreetingSchema);

// ─────────────────────────────────────────────────────────────
// Schema: Orders
// ─────────────────────────────────────────────────────────────

export const OrdersSchema = {
  $id: "Orders",
  type: "object",
  additionalProperties: false,
  required: ["intent", "confidence"],
  properties: {
    intent: {
      type: "string",
      enum: ["add_to_cart", "remove_from_cart", "view_cart", "confirm_order"],
    },
    confidence: { type: "number", minimum: 0, maximum: 1 },
    items: {
      anyOf: [
        { type: "null" },
        {
          type: "array",
          items: {
            type: "object",
            additionalProperties: false,
            required: ["product_query"],
            properties: {
              product_query: { type: "string", minLength: 1 },
              quantity: { anyOf: [{ type: "number" }, { type: "null" }] },
              unit: { anyOf: [{ type: "string", enum: ["kg", "g", "unidad"] }, { type: "null" }] },
            },
          },
        },
      ],
    },
    product_query: { anyOf: [{ type: "string" }, { type: "null" }] },
    quantity: { anyOf: [{ type: "number" }, { type: "null" }] },
    unit: { anyOf: [{ type: "string", enum: ["kg", "g", "unidad"] }, { type: "null" }] },
  },
};

export const validateOrders = ajv.compile(OrdersSchema);

// ─────────────────────────────────────────────────────────────
// Schema: Shipping
// ─────────────────────────────────────────────────────────────

export const ShippingSchema = {
  $id: "Shipping",
  type: "object",
  additionalProperties: false,
  required: ["intent"],
  properties: {
    intent: {
      type: "string",
      enum: ["select_shipping", "provide_address"],
    },
    shipping_method: {
      anyOf: [{ type: "string", enum: ["delivery", "pickup"] }, { type: "null" }],
    },
    address: { anyOf: [{ type: "string" }, { type: "null" }] },
  },
};

export const validateShipping = ajv.compile(ShippingSchema);

// ─────────────────────────────────────────────────────────────
// Schema: Payment
// ─────────────────────────────────────────────────────────────

export const PaymentSchema = {
  $id: "Payment",
  type: "object",
  additionalProperties: false,
  required: ["intent"],
  properties: {
    intent: {
      type: "string",
      enum: ["select_payment"],
    },
    payment_method: {
      anyOf: [{ type: "string", enum: ["cash", "link"] }, { type: "null" }],
    },
  },
};

export const validatePayment = ajv.compile(PaymentSchema);

// ─────────────────────────────────────────────────────────────
// Schema: Browse
// ─────────────────────────────────────────────────────────────

export const BrowseSchema = {
  $id: "Browse",
  type: "object",
  additionalProperties: false,
  required: ["intent"],
  properties: {
    intent: {
      type: "string",
      enum: ["price_query", "browse", "recommend"],
    },
    product_query: { anyOf: [{ type: "string" }, { type: "null" }] },
    people_count: { anyOf: [{ type: "number" }, { type: "null" }] },
    event_type: { anyOf: [{ type: "string" }, { type: "null" }] },
  },
};

export const validateBrowse = ajv.compile(BrowseSchema);

// ─────────────────────────────────────────────────────────────
// Schema: NLU Unificado (output final)
// ─────────────────────────────────────────────────────────────

export const UnifiedNluSchema = {
  $id: "UnifiedNlu",
  type: "object",
  additionalProperties: false,
  required: ["intent", "confidence", "language", "entities", "needs"],
  properties: {
    intent: {
      type: "string",
      enum: [
        "price_query", "browse", "add_to_cart", "remove_from_cart",
        "checkout", "confirm_order", "select_payment", "select_shipping",
        "provide_address", "greeting", "recommend", "view_cart", "other"
      ],
    },
    confidence: { type: "number", minimum: 0, maximum: 1 },
    language: { type: "string" },
    entities: {
      type: "object",
      additionalProperties: false,
      required: ["product_query", "quantity", "unit", "selection", "attributes", "preparation", "items"],
      properties: {
        product_query: { anyOf: [{ type: "string" }, { type: "null" }] },
        quantity: { anyOf: [{ type: "number" }, { type: "null" }] },
        unit: { anyOf: [{ type: "string", enum: ["kg", "g", "unidad"] }, { type: "null" }] },
        selection: {
          anyOf: [
            { type: "null" },
            {
              type: "object",
              additionalProperties: false,
              required: ["type", "value"],
              properties: {
                type: { type: "string", enum: ["index", "text", "sku"] },
                value: { type: "string", minLength: 1 },
              },
            },
          ],
        },
        attributes: { type: "array", items: { type: "string" } },
        preparation: { type: "array", items: { type: "string" } },
        payment_method: { anyOf: [{ type: "string", enum: ["cash", "link"] }, { type: "null" }] },
        shipping_method: { anyOf: [{ type: "string", enum: ["delivery", "pickup"] }, { type: "null" }] },
        address: { anyOf: [{ type: "string" }, { type: "null" }] },
        items: {
          anyOf: [
            { type: "null" },
            {
              type: "array",
              items: {
                type: "object",
                additionalProperties: false,
                required: ["product_query"],
                properties: {
                  product_query: { type: "string", minLength: 1 },
                  quantity: { anyOf: [{ type: "number" }, { type: "null" }] },
                  unit: { anyOf: [{ type: "string", enum: ["kg", "g", "unidad"] }, { type: "null" }] },
                },
              },
            },
          ],
        },
        // Browse-specific
        people_count: { anyOf: [{ type: "number" }, { type: "null" }] },
        event_type: { anyOf: [{ type: "string" }, { type: "null" }] },
      },
    },
    needs: {
      type: "object",
      additionalProperties: false,
      required: ["catalog_lookup", "knowledge_lookup"],
      properties: {
        catalog_lookup: { type: "boolean" },
        knowledge_lookup: { type: "boolean" },
      },
    },
    // Greeting-specific: reply del LLM
    reply: { anyOf: [{ type: "string" }, { type: "null" }] },
  },
};

export const validateUnifiedNlu = ajv.compile(UnifiedNluSchema);

// ─────────────────────────────────────────────────────────────
// Helpers
// ─────────────────────────────────────────────────────────────

/**
 * Obtiene errores de validación formateados
 */
export function getValidationErrors(validate) {
  const errors = validate.errors || [];
  return errors.map((e) => ({
    path: e.instancePath,
    message: e.message,
    params: e.params,
  }));
}

/**
 * Crea un NLU unificado vacío (fallback)
 */
export function createEmptyNlu() {
  return {
    intent: "other",
    confidence: 0,
    language: "es-AR",
    entities: {
      product_query: null,
      quantity: null,
      unit: null,
      selection: null,
      attributes: [],
      preparation: [],
      payment_method: null,
      shipping_method: null,
      address: null,
      items: null,
      people_count: null,
      event_type: null,
    },
    needs: {
      catalog_lookup: false,
      knowledge_lookup: false,
    },
    reply: null,
  };
}