/**
 * E2E sync integration tests: full syncDid() pipeline against mock PDS accounts.
 *
 * Uses createTestRepo() + startMockPds() to spin up tiny in-process PDS servers,
 * then verifies ReplicationManager.syncDid() stores blocks, updates state, etc.
 */

import { describe, it, expect, beforeEach, afterEach } from "vitest";
import { mkdtempSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import Database from "better-sqlite3";
import { readCarWithRoot } from "@atproto/repo";

import { IpfsService, type NetworkService } from "../ipfs.js";
import { RepoManager } from "../repo-manager.js";
import type { Config } from "../config.js";
import { ReplicationManager } from "./replication-manager.js";
import {
	createTestRepo,
	startMockPds,
	createMockDidResolver,
	type MockPds,
} from "./test-helpers.js";

const TEST_DID = "did:plc:testuser1";
const TEST_DID_2 = "did:plc:testuser2";

function testConfig(dataDir: string, replicateDids: string[] = []): Config {
	return {
		DID: "did:plc:localnode",
		HANDLE: "local.test",
		PDS_HOSTNAME: "local.test",
		AUTH_TOKEN: "test-auth-token",
		SIGNING_KEY:
			"0000000000000000000000000000000000000000000000000000000000000001",
		SIGNING_KEY_PUBLIC: "zQ3shP2mWsZYWgvZM9GJ3EvMfRXQJwuTh6BdXLvJB9gFhT3Lr",
		JWT_SECRET: "test-jwt-secret",
		PASSWORD_HASH: "$2a$10$test",
		DATA_DIR: dataDir,
		PORT: 3000,
		IPFS_ENABLED: true,
		IPFS_NETWORKING: false,
		REPLICATE_DIDS: replicateDids,
		FIREHOSE_URL: "wss://localhost/xrpc/com.atproto.sync.subscribeRepos",
		FIREHOSE_ENABLED: false,
		RATE_LIMIT_ENABLED: false,
		RATE_LIMIT_READ_PER_MIN: 300,
		RATE_LIMIT_SYNC_PER_MIN: 30,
		RATE_LIMIT_SESSION_PER_MIN: 10,
		RATE_LIMIT_WRITE_PER_MIN: 200,
		RATE_LIMIT_CHALLENGE_PER_MIN: 20,
		RATE_LIMIT_MAX_CONNECTIONS: 100,
		RATE_LIMIT_FIREHOSE_PER_IP: 3,
		OAUTH_ENABLED: false, PUBLIC_URL: "http://localhost:3000",
	};
}

const mockNetworkService: NetworkService = {
	provideBlocks: async () => {},
	publishCommitNotification: async () => {},
	onCommitNotification: () => {},
	subscribeCommitTopics: () => {},
	unsubscribeCommitTopics: () => {},
	getPeerId: () => null,
	getMultiaddrs: () => [],
	getConnectionCount: () => 0,
	getRemoteAddrs: () => [],
	publishIdentityNotification: async () => {},
	onIdentityNotification: () => {},
	subscribeIdentityTopics: () => {},
	unsubscribeIdentityTopics: () => {},
	provideForDid: async () => {},
	findProvidersForDid: async () => [],
};

describe("E2E sync integration", () => {
	let tmpDir: string;
	let db: InstanceType<typeof Database>;
	let ipfsService: IpfsService;
	let repoManager: RepoManager;
	let mockPds: MockPds;
	let replicationManager: ReplicationManager;

	afterEach(async () => {
		replicationManager?.stop();
		await mockPds?.close();
		if (ipfsService?.isRunning()) await ipfsService.stop();
		db?.close();
		if (tmpDir) rmSync(tmpDir, { recursive: true, force: true });
	});

	/**
	 * Set up a full test environment with mock PDS serving the given accounts.
	 */
	async function setup(opts: {
		dids: string[];
		accounts: Array<{ did: string; carBytes: Uint8Array; blobs?: Map<string, Uint8Array> }>;
	}) {
		tmpDir = mkdtempSync(join(tmpdir(), "e2e-sync-"));
		db = new Database(join(tmpDir, "test.db"));

		const config = testConfig(tmpDir, opts.dids);

		repoManager = new RepoManager(db, config);
		repoManager.init();

		ipfsService = new IpfsService({
			db,
			networking: false,
		});
		await ipfsService.start();

		mockPds = await startMockPds(opts.accounts);

		const didMapping: Record<string, string> = {};
		for (const did of opts.dids) {
			didMapping[did] = mockPds.url;
		}
		const mockResolver = createMockDidResolver(didMapping);

		replicationManager = new ReplicationManager(
			db,
			config,
			repoManager,
			ipfsService,
			mockNetworkService,
			mockResolver,
		);
		await replicationManager.init();

		return { config, mockResolver };
	}

	it("syncs an empty account (commit block only)", async () => {
		const carBytes = await createTestRepo(TEST_DID);
		await setup({
			dids: [TEST_DID],
			accounts: [{ did: TEST_DID, carBytes }],
		});

		await replicationManager.syncDid(TEST_DID);

		const states = replicationManager.getSyncStates();
		const state = states.find((s) => s.did === TEST_DID);
		expect(state).toBeDefined();
		expect(state!.lastSyncRev).toBeTruthy();
		expect(state!.rootCid).toBeTruthy();
		expect(state!.pdsEndpoint).toBe(mockPds.url);
	}, 15_000);

	it("syncs an account with records", async () => {
		const records = [
			{ collection: "app.bsky.feed.post", rkey: "post1", record: { text: "Hello world", createdAt: new Date().toISOString() } },
			{ collection: "app.bsky.feed.post", rkey: "post2", record: { text: "Second post", createdAt: new Date().toISOString() } },
			{ collection: "app.bsky.actor.profile", rkey: "self", record: { displayName: "Test User" } },
		];
		const carBytes = await createTestRepo(TEST_DID, records);
		await setup({
			dids: [TEST_DID],
			accounts: [{ did: TEST_DID, carBytes }],
		});

		await replicationManager.syncDid(TEST_DID);

		const states = replicationManager.getSyncStates();
		const state = states.find((s) => s.did === TEST_DID);
		expect(state).toBeDefined();
		expect(state!.lastSyncRev).toBeTruthy();

		// Verify blocks were stored: parse original CAR and check each block exists
		const { blocks } = await readCarWithRoot(carBytes);
		const internalMap = (blocks as unknown as { map: Map<string, Uint8Array> }).map;
		for (const [cidStr] of internalMap.entries()) {
			const hasIt = await ipfsService.hasBlock(cidStr);
			expect(hasIt, `block ${cidStr} should be stored`).toBe(true);
		}
	}, 15_000);

	it("syncs multiple accounts", async () => {
		const car1 = await createTestRepo(TEST_DID, [
			{ collection: "app.bsky.feed.post", rkey: "a", record: { text: "User 1" } },
		]);
		const car2 = await createTestRepo(TEST_DID_2, [
			{ collection: "app.bsky.feed.post", rkey: "b", record: { text: "User 2" } },
		]);

		await setup({
			dids: [TEST_DID, TEST_DID_2],
			accounts: [
				{ did: TEST_DID, carBytes: car1 },
				{ did: TEST_DID_2, carBytes: car2 },
			],
		});

		await replicationManager.syncAll();

		const states = replicationManager.getSyncStates();
		const state1 = states.find((s) => s.did === TEST_DID);
		const state2 = states.find((s) => s.did === TEST_DID_2);
		expect(state1?.lastSyncRev).toBeTruthy();
		expect(state2?.lastSyncRev).toBeTruthy();
	}, 15_000);

	it("adds a DID via admin API and syncs", async () => {
		const carBytes = await createTestRepo(TEST_DID, [
			{ collection: "app.bsky.feed.post", rkey: "p1", record: { text: "Admin added" } },
		]);

		// Start with no replicate DIDs — we'll add via admin API
		tmpDir = mkdtempSync(join(tmpdir(), "e2e-sync-"));
		db = new Database(join(tmpDir, "test.db"));
		const config = testConfig(tmpDir, []);
		repoManager = new RepoManager(db, config);
		repoManager.init();
		ipfsService = new IpfsService({
			db,
			networking: false,
		});
		await ipfsService.start();
		mockPds = await startMockPds([{ did: TEST_DID, carBytes }]);
		const mockResolver = createMockDidResolver({ [TEST_DID]: mockPds.url });

		replicationManager = new ReplicationManager(
			db,
			config,
			repoManager,
			ipfsService,
			mockNetworkService,
			mockResolver,
		);
		await replicationManager.init();

		// Add DID via admin interface
		const result = await replicationManager.addDid(TEST_DID);
		expect(result.status).toBe("added");

		// addDid fires syncDid in background — wait a bit then check
		await new Promise((r) => setTimeout(r, 2000));

		const states = replicationManager.getSyncStates();
		const state = states.find((s) => s.did === TEST_DID);
		expect(state).toBeDefined();
		expect(state!.pdsEndpoint).toBe(mockPds.url);
		// The sync may or may not have completed yet, but the DID should be tracked
		expect(replicationManager.getReplicateDids()).toContain(TEST_DID);
	}, 15_000);

	it("persists sync state across ReplicationManager restarts", async () => {
		const carBytes = await createTestRepo(TEST_DID, [
			{ collection: "app.bsky.feed.post", rkey: "p1", record: { text: "Persistent" } },
		]);
		await setup({
			dids: [TEST_DID],
			accounts: [{ did: TEST_DID, carBytes }],
		});

		await replicationManager.syncDid(TEST_DID);

		const statesBefore = replicationManager.getSyncStates();
		const stateBefore = statesBefore.find((s) => s.did === TEST_DID);
		expect(stateBefore?.lastSyncRev).toBeTruthy();

		// Stop and create a new ReplicationManager on the same DB
		replicationManager.stop();

		const config2 = testConfig(tmpDir, [TEST_DID]);
		const mockResolver2 = createMockDidResolver({ [TEST_DID]: mockPds.url });
		const replicationManager2 = new ReplicationManager(
			db,
			config2,
			repoManager,
			ipfsService,
			mockNetworkService,
			mockResolver2,
		);
		await replicationManager2.init();

		const statesAfter = replicationManager2.getSyncStates();
		const stateAfter = statesAfter.find((s) => s.did === TEST_DID);
		expect(stateAfter).toBeDefined();
		expect(stateAfter!.lastSyncRev).toBe(stateBefore!.lastSyncRev);
		expect(stateAfter!.rootCid).toBe(stateBefore!.rootCid);

		replicationManager2.stop();
		// Replace reference so afterEach doesn't double-stop
		replicationManager = replicationManager2;
	}, 15_000);

	it("handles sync of account with blobs", async () => {
		// Create a blob and a record that references it
		const blobBytes = new TextEncoder().encode("fake image data for testing");
		const { create: createCid, CODEC_RAW, toString: cidToString } = await import("@atcute/cid");
		const blobCid = cidToString(await createCid(CODEC_RAW, blobBytes));

		const carBytes = await createTestRepo(TEST_DID, [
			{
				collection: "app.bsky.feed.post",
				rkey: "with-blob",
				record: {
					text: "Post with image",
					embed: {
						$type: "app.bsky.embed.images",
						images: [
							{
								alt: "test",
								image: {
									$type: "blob",
									ref: { $link: blobCid },
									mimeType: "image/jpeg",
									size: blobBytes.length,
								},
							},
						],
					},
				},
			},
		]);

		const blobs = new Map<string, Uint8Array>();
		blobs.set(blobCid, blobBytes);

		await setup({
			dids: [TEST_DID],
			accounts: [{ did: TEST_DID, carBytes, blobs }],
		});

		await replicationManager.syncDid(TEST_DID);

		const states = replicationManager.getSyncStates();
		const state = states.find((s) => s.did === TEST_DID);
		expect(state).toBeDefined();
		expect(state!.lastSyncRev).toBeTruthy();

		// Note: blob sync requires ReplicatedRepoReader which we don't set up here.
		// The main syncDid pipeline (block storage) should still complete successfully.
	}, 15_000);

	it("sync completes within reasonable time for small repos", async () => {
		const carBytes = await createTestRepo(TEST_DID, [
			{ collection: "app.bsky.feed.post", rkey: "t1", record: { text: "Timing test" } },
		]);
		await setup({
			dids: [TEST_DID],
			accounts: [{ did: TEST_DID, carBytes }],
		});

		const start = Date.now();
		await replicationManager.syncDid(TEST_DID);
		const elapsed = Date.now() - start;

		// A tiny mock repo should sync in well under 5 seconds
		expect(elapsed).toBeLessThan(5000);
	}, 15_000);
});