import { type HeliaLibp2p } from "helia";

import { Identities, Identity, KeyStore, KeyStoreType } from "@orbitdb/core";
import OrderedKeyValue, {
  OrderedKeyValueDatabaseType,
} from "@/ordered-keyvalue.js";
import { DBElements } from "@/types.js";
import { createTestHelia } from "./config.js";
import { isBrowser } from "wherearewe";
import { expect } from "aegir/chai";

const keysPath = "./testkeys";

describe("OrderedKeyValue Database", () => {
  let ipfs: HeliaLibp2p;
  let identities;
  let keystore: KeyStoreType;
  let testIdentity1: Identity;
  let db: OrderedKeyValueDatabaseType;

  const databaseId = "ordered-keyvalue-AAA";

  before(async () => {
    ipfs = await createTestHelia({ directory: "./ipfsOKV" });

    keystore = await KeyStore({ path: keysPath });
    identities = await Identities({ keystore });
    testIdentity1 = await identities.createIdentity({ id: "userA" });
  });

  after(async () => {
    if (ipfs) {
      await ipfs.stop();
    }

    if (keystore) {
      await keystore.close();
    }

    if (!isBrowser) {
      const { rimraf } = await import("rimraf");
      await rimraf(keysPath);
      await rimraf("./orbitdb");
      await rimraf("./ipfsOKV");
    }
  });

  describe("Creating an Ordered KeyValue database", () => {
    beforeEach(async () => {
      db = await OrderedKeyValue()({
        ipfs,
        identity: testIdentity1,
        address: databaseId,
      });
    });

    afterEach(async () => {
      if (db) {
        await db.drop();
        await db.close();
      }
    });

    it("creates an ordered-keyvalue store", async () => {
      expect(db.address.toString()).to.equal(databaseId);
      expect(db.type).to.equal("ordered-keyvalue");
    });

    it("returns 0 items when it's a fresh database", async () => {
      const all = [];
      for await (const item of db.iterator()) {
        all.unshift(item);
      }

      expect(all.length).to.equal(0);
    });
  });

  describe("Ordered-keyvalue database API", () => {
    beforeEach(async () => {
      db = await OrderedKeyValue()({
        ipfs,
        identity: testIdentity1,
        address: databaseId,
      });
    });

    afterEach(async () => {
      if (db) {
        await db.drop();
        await db.close();
      }
    });

    it("add a value", async () => {
      const actual = await db.put("key1", "value1");
      expect(actual).to.be.a.not.empty("string");
    });

    it("get a value", async () => {
      const value = "value1";
      const key = "key1";

      await db.put(key, value);

      const actual = await db.get(key);

      expect(actual).to.deep.equal({ value });
    });

    it("get a value with position", async () => {
      const value = "value1";
      const key = "key1";

      await db.put(key, value, 3);

      const actual = await db.get(key);

      expect(actual).to.deep.equal({ value, position: 3 });
    });

    it("override a key", async () => {
      const value = "value1";
      const value2 = "value2";
      const key = "key1";

      await db.put(key, value);
      await db.put(key, value2);

      const actual = await db.get(key);

      expect(actual).to.deep.equal({ value: value2 });
    });

    it("del a value", async () => {
      const key = "key1";
      const value = "value1";

      await db.put(key, value);
      await db.del(key);

      const actual = await db.all();
      expect(actual).to.be.an.empty("array");
    });

    it("del and then add a value", async () => {
      const value = "value1";
      const key = "key1";

      await db.put(key, value);
      await db.del(key);
      const hash = await db.put(key, value);

      const actual = await db.all();

      expect(actual).to.deep.equal([{ value, key, hash }]);
    });

    it("add a value with implicit position", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2);

      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value, key, hash },
        { value: value2, key: key2, hash: hash2 },
      ]);
    });

    it("add a value - index 0", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2, 0);

      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value, key, hash },
      ]);
    });

    it("add a value - negative index", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2, -1);

      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value, key, hash },
        { value: value2, key: key2, hash: hash2 },
      ]);
    });

    it("add a value - index > length", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2, 4);

      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value, key, hash },
        { value: value2, key: key2, hash: hash2 },
      ]);
    });

    it("move a value", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2);
      await db.move(key, 1);
      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value, key, hash },
      ]);
    });

    it("move a value - index 0", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2);
      await db.move(key2, 0);
      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value, key, hash },
      ]);
    });

    it("move a value - negative index", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2);
      await db.move(key, -1);
      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value, key, hash },
      ]);
    });

    it("move a value - index > length", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2);
      await db.move(key, 3);
      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value, key, hash },
      ]);
    });

    it("add a value twice, with new position", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      await db.put(key, value);
      const hash2 = await db.put(key2, value2);
      const hash1a = await db.put(key, value, 2);

      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value, key, hash: hash1a },
      ]);
    });

    it("move and override a key concurrently", async () => {
      const value = "value1";
      const valueMod = "value1a";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      await db.put(key, value);
      const hash2 = await db.put(key2, value2);
      await db.move(key, 1);

      const hash = await db.put(key, valueMod);

      const actual = await db.all();

      expect(actual).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: valueMod, key, hash },
      ]);
    });

    it("move a value twice", async () => {
      const value = "value1";
      const key = "key1";

      const value2 = "value2";
      const key2 = "key2";

      const value3 = "value3";
      const key3 = "key3";

      const hash = await db.put(key, value);
      const hash2 = await db.put(key2, value2);
      const hash3 = await db.put(key3, value3);
      await db.move(key, 1);

      const actual1 = await db.all();
      expect(actual1).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value, key, hash },
        { value: value3, key: key3, hash: hash3 },
      ]);

      await db.move(key, 2);

      const actual2 = await db.all();
      expect(actual2).to.deep.equal([
        { value: value2, key: key2, hash: hash2 },
        { value: value3, key: key3, hash: hash3 },
        { value: value, key, hash },
      ]);
    });

    it("returns all values", async () => {
      const keyvalue: {
        value: DBElements;
        key: string;
        position: number;
        hash?: string;
      }[] = [
        {
          key: "key1",
          position: 0,
          value: "init",
        },
        {
          key: "key2",
          position: 1,
          value: true,
        },
        {
          key: "key3",
          position: 2,
          value: "hello",
        },
        {
          key: "key4",
          position: 3,
          value: "friend",
        },
        {
          key: "key5",
          position: 4,
          value: "12345",
        },
        {
          key: "key6",
          position: 5,
          value: "empty",
        },
        {
          key: "key7",
          position: 6,
          value: "friend33",
        },
      ];

      for (const entry of Object.values(keyvalue)) {
        entry.hash = await db.put(entry.key, entry.value, entry.position);
      }

      const all = [];
      for await (const pair of db.iterator()) {
        all.push(pair);
      }

      expect(all).to.deep.equal(keyvalue);
    });
  });

  describe("Iterator", () => {
    before(async () => {
      db = await OrderedKeyValue()({
        ipfs,
        identity: testIdentity1,
        address: databaseId,
      });
    });

    after(async () => {
      if (db) {
        await db.drop();
        await db.close();
      }
    });

    it("has an iterator function", async () => {
      expect(db.iterator).to.not.be.undefined();
      expect(typeof db.iterator).to.equal("function");
    });

    it("returns no values when the database is empty", async () => {
      const all = [];
      for await (const { hash, value, key } of db.iterator()) {
        all.unshift({ hash, value, key });
      }
      expect(all.length).to.equal(0);
    });

    it("returns all values when the database is not empty", async () => {
      await db.put("key1", "value1");
      await db.put("key2", "value2");
      await db.put("key3", "value3");
      await db.put("key4", "value4");
      await db.put("key5", "value5");

      // Add one more value and then delete it to count
      // for the fact that the amount returned should be
      // the amount of actual values returned and not
      // the oplog length, and deleted values don't
      // count towards the returned amount.
      await db.put("key6", "value6");
      await db.del("key6");

      const all = [];
      let position = 0;
      for await (const { hash, value } of db.iterator()) {
        all.unshift({ hash, value, position });
        position++;
      }
      expect(all.length).to.equal(5);
    });

    it("returns only the amount of values given as a parameter", async () => {
      const amount = 3;
      const all = [];
      for await (const { hash, value } of db.iterator({ amount })) {
        all.unshift({ hash, value });
      }
      expect(all.length).to.equal(amount);
    });

    it("returns only two values if amount given as a parameter is 2", async () => {
      const amount = 2;
      const all = [];
      for await (const { hash, value } of db.iterator({ amount })) {
        all.unshift({ hash, value });
      }
      expect(all.length).to.equal(amount);
    });

    it("returns only one value if amount given as a parameter is 1", async () => {
      const amount = 1;
      const all = [];
      for await (const { hash, value } of db.iterator({ amount })) {
        all.unshift({ hash, value });
      }
      expect(all.length).to.equal(amount);
    });
  });
});