/**
 * PrivacyPort contract tests — validate V0 noop stub interface compliance.
 *
 * Tests verify:
 * - applyMask returns input unchanged (identity function V0)
 * - verifyZkProof always returns {valid: false, reason: 'noop_v0'}
 * - commitToSmt returns deterministic mock root with correct structure
 * - NoopPrivacyAdapter satisfies the PrivacyPort interface
 * - All operations handle various context and commitment types
 */

import { describe, it, expect } from "vitest";
import {
  NoopPrivacyAdapter,
  type RevelationMask,
  type ZkProofInput,
  type PrivacyContext,
  type Commitment,
} from "./privacy";

describe("PrivacyPort contract", () => {
  describe("applyMask", () => {
    it("returns input payload unchanged (V0 identity function)", async () => {
      const adapter = new NoopPrivacyAdapter();
      const payload = { secret: "hidden", public: "visible", count: 42 };
      const mask: RevelationMask = {
        public_fields: ["public"],
        private_fields: ["secret"],
      };
      const ctx: PrivacyContext = { user_id: "user-1", tenant_id: "tenant-a" };

      const result = await adapter.applyMask(payload, mask, ctx);

      expect(result).toEqual(payload);
      expect(result).toBe(payload); // same reference (identity)
    });

    it("handles complex nested objects unchanged", async () => {
      const adapter = new NoopPrivacyAdapter();
      const payload = {
        user: {
          id: "u1",
          nested: {
            secret: "data",
            array: [1, 2, 3],
          },
        },
      };
      const mask: RevelationMask = {
        public_fields: ["user.id"],
        private_fields: ["user.nested.secret"],
      };
      const ctx: PrivacyContext = {};

      const result = await adapter.applyMask(payload, mask, ctx);

      expect(result).toEqual(payload);
    });

    it("accepts conditional revelation masks", async () => {
      const adapter = new NoopPrivacyAdapter();
      const payload = { data: "value" };
      const mask: RevelationMask = {
        public_fields: ["id"],
        private_fields: ["secret"],
        conditional: [
          {
            field: "email",
            condition: "user_role == 'admin'",
          },
        ],
      };
      const ctx: PrivacyContext = { role: "admin" };

      const result = await adapter.applyMask(payload, mask, ctx);

      expect(result).toEqual(payload);
    });

    it("handles various payload types (string, number, array, null)", async () => {
      const adapter = new NoopPrivacyAdapter();
      const mask: RevelationMask = {
        public_fields: [],
        private_fields: [],
      };
      const ctx: PrivacyContext = {};

      const testCases = [
        "string payload",
        42,
        3.14,
        true,
        [1, 2, 3],
        null,
        undefined,
      ];

      for (const payload of testCases) {
        const result = await adapter.applyMask(payload, mask, ctx);
        expect(result).toEqual(payload);
      }
    });

    it("context parameters are accepted and ignored (V0)", async () => {
      const adapter = new NoopPrivacyAdapter();
      const payload = { data: "test" };
      const mask: RevelationMask = {
        public_fields: [],
        private_fields: [],
      };

      const contexts = [
        { user_id: "u1" },
        { tenant_id: "t1", jurisdiction: "FR.v1" },
        { role: "admin", user_id: "u2", metadata: { custom: "value" } },
        {},
      ];

      for (const ctx of contexts) {
        const result = await adapter.applyMask(payload, mask, ctx);
        expect(result).toEqual(payload);
      }
    });
  });

  describe("verifyZkProof", () => {
    it("always returns invalid with 'noop_v0' reason", async () => {
      const adapter = new NoopPrivacyAdapter();
      const proof: ZkProofInput = {
        proof_data: { some: "proof" },
        public_inputs: { value: 42 },
      };
      const ctx: PrivacyContext = {};

      const result = await adapter.verifyZkProof(proof, ctx);

      expect(result.valid).toBe(false);
      expect(result.reason).toBe("noop_v0");
      expect(result.confidence).toBe(0);
    });

    it("handles various proof schemes (V0 ignores)", async () => {
      const adapter = new NoopPrivacyAdapter();
      const schemes = ["stwo", "starknet_stone", "groth16", "plonk"];

      for (const scheme of schemes) {
        const proof: ZkProofInput = {
          proof_data: { scheme_data: "test" },
          public_inputs: {},
          scheme,
        };
        const result = await adapter.verifyZkProof(proof, {});

        expect(result.valid).toBe(false);
        expect(result.reason).toBe("noop_v0");
      }
    });

    it("accepts empty public inputs", async () => {
      const adapter = new NoopPrivacyAdapter();
      const proof: ZkProofInput = {
        proof_data: "opaque_bytes",
        public_inputs: {},
      };

      const result = await adapter.verifyZkProof(proof, {});

      expect(result.valid).toBe(false);
      expect(result.reason).toBe("noop_v0");
    });

    it("context parameters are accepted and ignored (V0)", async () => {
      const adapter = new NoopPrivacyAdapter();
      const proof: ZkProofInput = {
        proof_data: "test",
        public_inputs: { x: 1 },
      };

      const contexts = [
        { user_id: "u1" },
        { tenant_id: "t1", jurisdiction: "EU.v1" },
        { role: "operator" },
      ];

      for (const ctx of contexts) {
        const result = await adapter.verifyZkProof(proof, ctx);
        expect(result.valid).toBe(false);
      }
    });
  });

  describe("commitToSmt", () => {
    it("returns mock SMT root with correct structure", async () => {
      const adapter = new NoopPrivacyAdapter();
      const commitment: Commitment = { value: "test_value" };
      const ctx: PrivacyContext = {};

      const result = await adapter.commitToSmt(commitment, ctx);

      expect(result.smt_root).toBeDefined();
      expect(result.smt_root).toMatch(/^0x[0-9a-f]+$/);
      expect(result.leaf_index).toBe(0);
      expect(result.version).toBe(0);
    });

    it("returns deterministic root for same commitment", async () => {
      const adapter = new NoopPrivacyAdapter();
      const commitment: Commitment = { value: "deterministic" };
      const ctx: PrivacyContext = {};

      const result1 = await adapter.commitToSmt(commitment, ctx);
      const result2 = await adapter.commitToSmt(commitment, ctx);

      expect(result1.smt_root).toBe(result2.smt_root);
    });

    it("returns different root for different commitments", async () => {
      const adapter = new NoopPrivacyAdapter();
      const ctx: PrivacyContext = {};

      const result1 = await adapter.commitToSmt({ value: "value1" }, ctx);
      const result2 = await adapter.commitToSmt({ value: "value2" }, ctx);

      expect(result1.smt_root).not.toBe(result2.smt_root);
    });

    it("respects explicit leaf_index from commitment", async () => {
      const adapter = new NoopPrivacyAdapter();
      const commitment: Commitment = { value: "test", index: 42 };
      const ctx: PrivacyContext = {};

      const result = await adapter.commitToSmt(commitment, ctx);

      expect(result.leaf_index).toBe(42);
    });

    it("defaults leaf_index to 0 when not specified", async () => {
      const adapter = new NoopPrivacyAdapter();
      const commitment: Commitment = { value: "test" };
      const ctx: PrivacyContext = {};

      const result = await adapter.commitToSmt(commitment, ctx);

      expect(result.leaf_index).toBe(0);
    });

    it("accepts optional salt in commitment", async () => {
      const adapter = new NoopPrivacyAdapter();
      const commitment: Commitment = {
        value: "secret",
        salt: "random_salt_123",
        index: 5,
      };
      const ctx: PrivacyContext = {};

      const result = await adapter.commitToSmt(commitment, ctx);

      expect(result.smt_root).toBeDefined();
      expect(result.leaf_index).toBe(5);
      expect(result.version).toBe(0);
    });

    it("handles various commitment value types", async () => {
      const adapter = new NoopPrivacyAdapter();
      const ctx: PrivacyContext = {};

      const values = [
        "string value",
        42,
        3.14,
        true,
        { nested: "object" },
        [1, 2, 3],
      ];

      for (const value of values) {
        const result = await adapter.commitToSmt({ value }, ctx);
        expect(result.smt_root).toBeDefined();
        expect(result.version).toBe(0);
      }
    });

    it("context parameters are accepted and ignored (V0)", async () => {
      const adapter = new NoopPrivacyAdapter();
      const commitment: Commitment = { value: "test" };

      const contexts = [
        { user_id: "u1", tenant_id: "t1" },
        { jurisdiction: "CH.v1" },
        { metadata: { custom: true } },
      ];

      for (const ctx of contexts) {
        const result = await adapter.commitToSmt(commitment, ctx);
        expect(result.smt_root).toBeDefined();
      }
    });
  });

  describe("NoopPrivacyAdapter interface compliance", () => {
    it("satisfies PrivacyPort contract", () => {
      const adapter = new NoopPrivacyAdapter();

      expect(typeof adapter.applyMask).toBe("function");
      expect(typeof adapter.verifyZkProof).toBe("function");
      expect(typeof adapter.commitToSmt).toBe("function");
    });

    it("all async methods return Promise", async () => {
      const adapter = new NoopPrivacyAdapter();

      const maskResult = adapter.applyMask(
        {},
        { public_fields: [], private_fields: [] },
        {}
      );
      const proofResult = adapter.verifyZkProof(
        { proof_data: "x", public_inputs: {} },
        {}
      );
      const smtResult = adapter.commitToSmt({ value: "x" }, {});

      expect(maskResult).toBeInstanceOf(Promise);
      expect(proofResult).toBeInstanceOf(Promise);
      expect(smtResult).toBeInstanceOf(Promise);

      await maskResult;
      await proofResult;
      await smtResult;
    });

    it("methods work together in realistic flow", async () => {
      const adapter = new NoopPrivacyAdapter();
      const ctx: PrivacyContext = { user_id: "user-1", role: "admin" };

      // Simulate a privacy-respecting workflow (V0: all no-ops)
      const payload = { secret: "data", public: "info" };
      const mask: RevelationMask = {
        public_fields: ["public"],
        private_fields: ["secret"],
      };

      const masked = await adapter.applyMask(payload, mask, ctx);
      expect(masked).toEqual(payload);

      const commitment: Commitment = { value: masked };
      const smtResult = await adapter.commitToSmt(commitment, ctx);
      expect(smtResult.smt_root).toBeDefined();
      expect(smtResult.version).toBe(0);

      const proof: ZkProofInput = {
        proof_data: { root: smtResult.smt_root },
        public_inputs: { commitment_hash: "hash" },
      };
      const verified = await adapter.verifyZkProof(proof, ctx);
      expect(verified.valid).toBe(false);
      expect(verified.reason).toBe("noop_v0");
    });
  });

  describe("V0 noop semantics validation", () => {
    it("demonstrates V0 identity semantics: applyMask is identity", async () => {
      const adapter = new NoopPrivacyAdapter();

      // V0 guarantee: f(x) = x for any x
      const testValues = [
        { a: 1, b: "secret" },
        "plain text",
        [1, 2, 3, "secret"],
        { deeply: { nested: { secret: "data" } } },
      ];

      for (const value of testValues) {
        const result = await adapter.applyMask(
          value,
          { public_fields: ["a"], private_fields: ["secret"] },
          {}
        );
        expect(result).toBe(value); // exact same object
      }
    });

    it("demonstrates V0 proof rejection: verifyZkProof always fails", async () => {
      const adapter = new NoopPrivacyAdapter();

      // V0 guarantee: verifyZkProof always returns invalid
      const proofs = [
        { proof_data: "valid_proof", public_inputs: {} },
        { proof_data: null, public_inputs: { x: 1 } },
        { proof_data: { complex: "structure" }, public_inputs: [] },
      ];

      for (const proof of proofs) {
        const result = await adapter.verifyZkProof(proof as ZkProofInput, {});
        expect(result.valid).toBe(false);
        expect(result.reason).toBe("noop_v0");
        expect(result.confidence).toBe(0);
      }
    });

    it("demonstrates V0 mock SMT: deterministic but no crypto", async () => {
      const adapter = new NoopPrivacyAdapter();

      // V0 guarantee: deterministic + version 0
      const c1 = await adapter.commitToSmt({ value: "test" }, {});
      const c2 = await adapter.commitToSmt({ value: "test" }, {});

      expect(c1.smt_root).toBe(c2.smt_root);
      expect(c1.version).toBe(0);
      expect(c2.version).toBe(0);
    });
  });
});
