import assert from "node:assert/strict";
import { mkdtemp, rm } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, beforeEach, describe, it } from "node:test";
import {
  smsBlockedNumbersDb,
  strongerBlockReason,
} from "../../src/db/smsBlockedNumbersSqlite.js";
import { closeDatabase } from "../../src/db/sqlite.js";
import { isPhoneNumberBlocked } from "../../src/services/smsService.js";
import { hashPhoneNumber } from "../../src/util/smsVerificationCode.js";

const SECRET = "block-test-secret";
const PHONE = "+15555550123";
const OTHER = "+15555550124";
const HASH = hashPhoneNumber(PHONE, SECRET);

let dir: string;
let savedDataDir: string | undefined;
let savedBlocked: string | undefined;

beforeEach(async () => {
  savedDataDir = process.env.NOTIFY_DATA_DIR;
  savedBlocked = process.env.SMS_BLOCKED_NUMBERS;
  delete process.env.SMS_BLOCKED_NUMBERS;
  dir = await mkdtemp(path.join(tmpdir(), "sms-block-"));
  process.env.NOTIFY_DATA_DIR = dir;
  closeDatabase();
});

afterEach(async () => {
  closeDatabase();
  if (savedDataDir === undefined) delete process.env.NOTIFY_DATA_DIR;
  else process.env.NOTIFY_DATA_DIR = savedDataDir;
  if (savedBlocked === undefined) delete process.env.SMS_BLOCKED_NUMBERS;
  else process.env.SMS_BLOCKED_NUMBERS = savedBlocked;
  await rm(dir, { recursive: true, force: true });
});

describe("smsBlockedNumbersDb", () => {
  it("blocks, reports, and unblocks by hash", async () => {
    assert.equal(await smsBlockedNumbersDb.isBlocked(HASH), false);

    const stored = await smsBlockedNumbersDb.block({
      phoneHash: HASH,
      phoneE164: PHONE,
      reason: "opt-out",
      detail: "keyword STOP",
    });
    assert.equal(stored.phoneE164, PHONE);
    assert.equal(stored.reason, "opt-out");
    assert.equal(await smsBlockedNumbersDb.isBlocked(HASH), true);

    assert.equal(await smsBlockedNumbersDb.unblock(HASH), true);
    assert.equal(await smsBlockedNumbersDb.isBlocked(HASH), false);
    assert.equal(await smsBlockedNumbersDb.unblock(HASH), false);
  });

  it("is idempotent, so a second STOP refreshes rather than fails", async () => {
    await smsBlockedNumbersDb.block({
      phoneHash: HASH,
      phoneE164: PHONE,
      reason: "manual",
      detail: "first",
    });
    await smsBlockedNumbersDb.block({
      phoneHash: HASH,
      reason: "manual",
      detail: "second",
    });

    const rows = await smsBlockedNumbersDb.list();
    assert.equal(rows.length, 1);
    assert.equal(rows[0].detail, "second");
    // The number is preserved when a later block omits it.
    assert.equal(rows[0].phoneE164, PHONE);
  });

  it("never downgrades an opt-out to a manual block", async () => {
    await smsBlockedNumbersDb.block({
      phoneHash: HASH,
      phoneE164: PHONE,
      reason: "opt-out",
      detail: "keyword STOP",
    });
    // An operator re-blocking must not erase the record saying the handset
    // asked, because that record is what forbids simply lifting the block.
    await smsBlockedNumbersDb.block({
      phoneHash: HASH,
      reason: "manual",
      detail: "operator",
    });
    assert.equal((await smsBlockedNumbersDb.get(HASH))?.reason, "opt-out");
  });

  it("upgrades a manual block when the handset actually opts out", async () => {
    await smsBlockedNumbersDb.block({ phoneHash: HASH, reason: "manual" });
    await smsBlockedNumbersDb.block({
      phoneHash: HASH,
      reason: "provider-opt-out",
    });
    assert.equal(
      (await smsBlockedNumbersDb.get(HASH))?.reason,
      "provider-opt-out"
    );

    await smsBlockedNumbersDb.block({ phoneHash: HASH, reason: "opt-out" });
    assert.equal((await smsBlockedNumbersDb.get(HASH))?.reason, "opt-out");

    // ...and does not fall back down again.
    await smsBlockedNumbersDb.block({
      phoneHash: HASH,
      reason: "provider-opt-out",
    });
    assert.equal((await smsBlockedNumbersDb.get(HASH))?.reason, "opt-out");
  });

  it("blocks only the hashed number, not its neighbours", async () => {
    await smsBlockedNumbersDb.block({ phoneHash: HASH, reason: "manual" });
    assert.equal(
      await smsBlockedNumbersDb.isBlocked(hashPhoneNumber(OTHER, SECRET)),
      false
    );
  });
});

describe("isPhoneNumberBlocked", () => {
  it("is false for a number on neither source", async () => {
    assert.equal(
      await isPhoneNumberBlocked({ phoneE164: PHONE, phoneHash: HASH }),
      false
    );
  });

  it("consults the table", async () => {
    await smsBlockedNumbersDb.block({ phoneHash: HASH, reason: "opt-out" });
    assert.equal(
      await isPhoneNumberBlocked({ phoneE164: PHONE, phoneHash: HASH }),
      true
    );
  });

  it("consults SMS_BLOCKED_NUMBERS without needing a database row", async () => {
    process.env.SMS_BLOCKED_NUMBERS = PHONE;
    assert.equal(
      await isPhoneNumberBlocked({ phoneE164: PHONE, phoneHash: HASH }),
      true
    );
    assert.equal(
      await isPhoneNumberBlocked({
        phoneE164: OTHER,
        phoneHash: hashPhoneNumber(OTHER, SECRET),
      }),
      false
    );
  });

  it("normalizes configured entries, so formatting does not defeat it", async () => {
    process.env.SMS_BLOCKED_NUMBERS = " (555) 555-0123 , 5555550124 ";
    assert.equal(
      await isPhoneNumberBlocked({ phoneE164: PHONE, phoneHash: HASH }),
      true
    );
    assert.equal(
      await isPhoneNumberBlocked({
        phoneE164: OTHER,
        phoneHash: hashPhoneNumber(OTHER, SECRET),
      }),
      true
    );
  });
});

describe("strongerBlockReason", () => {
  it("ranks an opt-out above a provider opt-out above a manual block", () => {
    assert.equal(strongerBlockReason(undefined, "manual"), "manual");
    assert.equal(strongerBlockReason("manual", "provider-opt-out"), "provider-opt-out");
    assert.equal(strongerBlockReason("provider-opt-out", "opt-out"), "opt-out");
    assert.equal(strongerBlockReason("opt-out", "manual"), "opt-out");
    assert.equal(strongerBlockReason("opt-out", "provider-opt-out"), "opt-out");
    assert.equal(strongerBlockReason("provider-opt-out", "manual"), "provider-opt-out");
  });
});