import { describe, expect, it } from "vitest";
import { matchesRule, resolveProductRuleConstraints, type ProductRuleLike, type ProductRef } from "../../app/services/product-rules.server";

function rule(overrides: Partial<ProductRuleLike> = {}): ProductRuleLike {
  return {
    scopeType: "vendor",
    scopeValue: "Acme",
    allowedMethods: [],
    leadTimeMin: null,
    allowedLocationIds: [],
    active: true,
    ...overrides,
  };
}

function product(overrides: Partial<ProductRef> = {}): ProductRef {
  return {
    id: "gid://shopify/Product/1",
    vendor: "Acme",
    productType: "Furniture",
    tags: ["fragile"],
    collectionIds: ["gid://shopify/Collection/1"],
    ...overrides,
  };
}

describe("matchesRule", () => {
  it("does not match an inactive rule", () => {
    expect(matchesRule(rule({ active: false }), product())).toBe(false);
  });

  it("matches vendor case-insensitively", () => {
    expect(matchesRule(rule({ scopeType: "vendor", scopeValue: "acme" }), product({ vendor: "Acme" }))).toBe(true);
  });

  it("does not match a different vendor", () => {
    expect(matchesRule(rule({ scopeType: "vendor", scopeValue: "Acme" }), product({ vendor: "Other" }))).toBe(false);
  });

  it("matches product type case-insensitively", () => {
    expect(matchesRule(rule({ scopeType: "type", scopeValue: "FURNITURE" }), product({ productType: "Furniture" }))).toBe(true);
  });

  it("matches a tag case-insensitively", () => {
    expect(matchesRule(rule({ scopeType: "tag", scopeValue: "Fragile" }), product({ tags: ["fragile", "new"] }))).toBe(true);
  });

  it("does not match a missing tag", () => {
    expect(matchesRule(rule({ scopeType: "tag", scopeValue: "clearance" }), product({ tags: ["fragile"] }))).toBe(false);
  });

  it("matches product id exactly", () => {
    expect(matchesRule(rule({ scopeType: "product", scopeValue: "gid://shopify/Product/1" }), product())).toBe(true);
  });

  it("matches collection id membership", () => {
    expect(
      matchesRule(rule({ scopeType: "collection", scopeValue: "gid://shopify/Collection/1" }), product()),
    ).toBe(true);
  });

  it("an unrecognized scope type never matches", () => {
    expect(matchesRule(rule({ scopeType: "bogus" }), product())).toBe(false);
  });
});

describe("resolveProductRuleConstraints", () => {
  it("returns unrestricted defaults when nothing matches", () => {
    const result = resolveProductRuleConstraints([rule({ scopeValue: "Other" })], [product()]);
    expect(result).toEqual({ minLeadTimeMin: 0, allowedMethods: null, allowedLocationIds: null });
  });

  it("takes the max lead time across multiple matching rules", () => {
    const rules = [
      rule({ scopeType: "vendor", scopeValue: "Acme", leadTimeMin: 60 }),
      rule({ scopeType: "tag", scopeValue: "fragile", leadTimeMin: 1440 }),
    ];
    const result = resolveProductRuleConstraints(rules, [product()]);
    expect(result.minLeadTimeMin).toBe(1440);
  });

  it("intersects allowedMethods across matching rules", () => {
    const rules = [
      rule({ scopeType: "vendor", scopeValue: "Acme", allowedMethods: ["PICKUP", "LOCAL_DELIVERY"] }),
      rule({ scopeType: "tag", scopeValue: "fragile", allowedMethods: ["PICKUP", "SHIPPING"] }),
    ];
    const result = resolveProductRuleConstraints(rules, [product()]);
    expect(result.allowedMethods).toEqual(["PICKUP"]);
  });

  it("intersecting to nothing blocks every method (empty array, not null)", () => {
    const rules = [
      rule({ scopeType: "vendor", scopeValue: "Acme", allowedMethods: ["PICKUP"] }),
      rule({ scopeType: "tag", scopeValue: "fragile", allowedMethods: ["SHIPPING"] }),
    ];
    const result = resolveProductRuleConstraints(rules, [product()]);
    expect(result.allowedMethods).toEqual([]);
  });

  it("a rule with no allowedMethods restriction doesn't narrow an already-restricted set", () => {
    const rules = [
      rule({ scopeType: "vendor", scopeValue: "Acme", allowedMethods: ["PICKUP"] }),
      rule({ scopeType: "tag", scopeValue: "fragile", allowedMethods: [] }),
    ];
    const result = resolveProductRuleConstraints(rules, [product()]);
    expect(result.allowedMethods).toEqual(["PICKUP"]);
  });

  it("intersects allowedLocationIds the same way as allowedMethods", () => {
    const rules = [
      rule({ scopeType: "vendor", scopeValue: "Acme", allowedLocationIds: ["loc_1", "loc_2"] }),
      rule({ scopeType: "tag", scopeValue: "fragile", allowedLocationIds: ["loc_2"] }),
    ];
    const result = resolveProductRuleConstraints(rules, [product()]);
    expect(result.allowedLocationIds).toEqual(["loc_2"]);
  });

  it("only rules matching something in the cart are combined — a non-matching rule is ignored entirely", () => {
    const rules = [
      rule({ scopeType: "vendor", scopeValue: "Other", leadTimeMin: 999, allowedMethods: ["PICKUP"] }),
      rule({ scopeType: "vendor", scopeValue: "Acme", leadTimeMin: 30 }),
    ];
    const result = resolveProductRuleConstraints(rules, [product()]);
    expect(result).toEqual({ minLeadTimeMin: 30, allowedMethods: null, allowedLocationIds: null });
  });

  it("multiple cart products each contribute their own matching rules", () => {
    const rules = [rule({ scopeType: "vendor", scopeValue: "Acme", leadTimeMin: 30 }), rule({ scopeType: "vendor", scopeValue: "Other", leadTimeMin: 90 })];
    const products = [product({ vendor: "Acme" }), product({ id: "gid://shopify/Product/2", vendor: "Other" })];
    const result = resolveProductRuleConstraints(rules, products);
    expect(result.minLeadTimeMin).toBe(90);
  });
});