const {
    isPhishingDomain,
    loadConfig,
    getBlocklistSize,
    hostnameVariants,
    _reset,
} = require("../src/shared/phishingDomains");

// Reset state before each test to avoid cross-test contamination.
beforeEach(() => {
    _reset();
});

describe("phishingDomains", () => {
    describe("hostnameVariants", () => {
        test("returns exact hostname plus parent domains", () => {
            const variants = hostnameVariants("sub.evil.com");
            expect(variants).toEqual(["sub.evil.com", "evil.com"]);
        });

        test("returns just the hostname for a bare domain", () => {
            const variants = hostnameVariants("example.com");
            expect(variants).toEqual(["example.com"]);
        });

        test("handles deep subdomain chains", () => {
            const variants = hostnameVariants("a.b.c.d.com");
            expect(variants).toEqual([
                "a.b.c.d.com",
                "b.c.d.com",
                "c.d.com",
                "d.com",
            ]);
        });

        test("lowercases hostnames", () => {
            const variants = hostnameVariants("Evil.COM");
            expect(variants).toEqual(["evil.com"]);
        });
    });

    describe("loadConfig + isPhishingDomain", () => {
        test("detects exact blacklisted domain", () => {
            loadConfig({
                blacklist: ["evil-phishing.com", "scam-swap.xyz"],
                whitelist: [],
            });
            expect(isPhishingDomain("evil-phishing.com")).toBe(true);
            expect(isPhishingDomain("scam-swap.xyz")).toBe(true);
        });

        test("returns false for clean domains", () => {
            loadConfig({
                blacklist: ["evil-phishing.com"],
                whitelist: [],
            });
            expect(isPhishingDomain("etherscan.io")).toBe(false);
            expect(isPhishingDomain("uniswap.org")).toBe(false);
        });

        test("detects subdomain of blacklisted domain", () => {
            loadConfig({
                blacklist: ["evil-phishing.com"],
                whitelist: [],
            });
            expect(isPhishingDomain("app.evil-phishing.com")).toBe(true);
            expect(isPhishingDomain("sub.app.evil-phishing.com")).toBe(true);
        });

        test("whitelist overrides blacklist", () => {
            loadConfig({
                blacklist: ["metamask.io"],
                whitelist: ["metamask.io"],
            });
            expect(isPhishingDomain("metamask.io")).toBe(false);
        });

        test("whitelist on parent domain overrides blacklist", () => {
            loadConfig({
                blacklist: ["sub.legit.com"],
                whitelist: ["legit.com"],
            });
            expect(isPhishingDomain("sub.legit.com")).toBe(false);
        });

        test("case-insensitive matching", () => {
            loadConfig({
                blacklist: ["Evil-Phishing.COM"],
                whitelist: [],
            });
            expect(isPhishingDomain("evil-phishing.com")).toBe(true);
            expect(isPhishingDomain("EVIL-PHISHING.COM")).toBe(true);
        });

        test("returns false for empty/null hostname", () => {
            loadConfig({
                blacklist: ["evil.com"],
                whitelist: [],
            });
            expect(isPhishingDomain("")).toBe(false);
            expect(isPhishingDomain(null)).toBe(false);
        });

        test("getBlocklistSize reflects loaded config", () => {
            loadConfig({
                blacklist: ["a.com", "b.com", "c.com"],
                whitelist: ["d.com"],
            });
            expect(getBlocklistSize()).toBe(3);
        });

        test("handles config with no blacklist/whitelist keys", () => {
            loadConfig({});
            expect(isPhishingDomain("anything.com")).toBe(false);
            expect(getBlocklistSize()).toBe(0);
        });

        test("re-loading config replaces previous data", () => {
            loadConfig({
                blacklist: ["old-scam.com"],
                whitelist: [],
            });
            expect(isPhishingDomain("old-scam.com")).toBe(true);

            loadConfig({
                blacklist: ["new-scam.com"],
                whitelist: [],
            });
            expect(isPhishingDomain("old-scam.com")).toBe(false);
            expect(isPhishingDomain("new-scam.com")).toBe(true);
        });
    });

    describe("real-world MetaMask blocklist patterns", () => {
        test("detects known phishing domains from MetaMask list", () => {
            loadConfig({
                blacklist: [
                    "uniswap-trade.web.app",
                    "hopprotocol.pro",
                    "blast-pools.pages.dev",
                ],
                whitelist: [],
            });
            expect(isPhishingDomain("uniswap-trade.web.app")).toBe(true);
            expect(isPhishingDomain("hopprotocol.pro")).toBe(true);
            expect(isPhishingDomain("blast-pools.pages.dev")).toBe(true);
        });

        test("does not flag legitimate domains whitelisted by MetaMask", () => {
            loadConfig({
                blacklist: ["opensea.pro"],
                whitelist: [
                    "opensea.io",
                    "metamask.io",
                    "etherscan.io",
                    "opensea.pro",
                ],
            });
            expect(isPhishingDomain("opensea.io")).toBe(false);
            expect(isPhishingDomain("metamask.io")).toBe(false);
            expect(isPhishingDomain("etherscan.io")).toBe(false);
            // opensea.pro is both blacklisted and whitelisted — whitelist wins
            expect(isPhishingDomain("opensea.pro")).toBe(false);
        });
    });
});