import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { newFixture, type Fixture } from '../helpers/fixture.js';
import { randomBytes } from 'node:crypto';

let fixture: Fixture;
const inventory = { hostname: 'games-1', agentVersion: '1.0.0', protocolVersion: 1, os: 'Debian 13', architecture: 'amd64', dockerRunning: true, directoriesWritable: true, storageAvailable: 100 * 1024 ** 3, runtimeImages: ['plutainer:test'], libraries: [{ id: 'test-library', state: 'ready' }] };
beforeEach(async () => { vi.resetModules(); fixture = await newFixture([]); });
afterEach(async () => { vi.useRealTimers(); vi.unstubAllEnvs(); await fixture.cleanup(); });

async function enrolled() {
    const hosts = await import('../../src/lib/server/hosts/index.js');
    const host = hosts.createHost({ name: 'Game host' });
    const enrollment = hosts.createEnrollment(host.id);
    return { ...hosts, host, enrollment, credentials: hosts.enrollHost(enrollment.token, inventory) };
}

describe('native host enrollment and scoped authentication', () => {
    it('separates observation and mutation delivery and wakes long polls on newly queued work', async () => {
        const api = await enrolled();
        const inspect = api.queueHostOperation(api.host.id, 'host.inspect', {});
        const restart = api.queueHostOperation(api.host.id, 'instance.restart', {});
        const status = api.queueHostOperation(api.host.id, 'rcon.execute', { command: 'status' });
        const command = api.queueHostOperation(api.host.id, 'rcon.execute', { command: 'map_restart' });
        expect(api.pendingHostOperations(api.host.id, 'read').map(op => op.id).sort()).toEqual([inspect.id, status.id].sort());
        expect(api.pendingHostOperations(api.host.id, 'write').map(op => op.id).sort()).toEqual([restart.id, command.id].sort());
        // Let earlier enqueue notifications finish before subscribing.
        await Promise.resolve();
        const controller = new AbortController();
        const waiting = api.waitForHostWork(api.host.id, controller.signal, 20_000);
        api.queueHostOperation(api.host.id, 'host.inspect', {});
        await waiting;
        const aborted = api.waitForHostWork(api.host.id, controller.signal, 20_000);
        controller.abort();
        await aborted;
    });
    it('consumes an enrollment exactly once and stores only credential hashes', async () => {
        const api = await enrolled();
        expect(api.authenticateCredential(api.credentials.credential)?.id).toBe(api.host.id);
        expect(api.authenticateCredential(api.enrollment.token)).toBeNull();
        expect(() => api.enrollHost(api.enrollment.token, inventory)).toThrow('invalid or expired');
        const { db } = await import('../../src/lib/server/db/index.js');
        const stored = JSON.stringify(db().prepare('SELECT * FROM ec_host_credentials').all()) + JSON.stringify(db().prepare('SELECT * FROM ec_host_enrollments').all());
        expect(stored).not.toContain(api.credentials.credential); expect(stored).not.toContain(api.enrollment.token);
    });
    it('expires enrollments and invalidates earlier unused enrollment tokens', async () => {
        const api = await enrolled();
        const first = api.createEnrollment(api.host.id); const next = api.createEnrollment(api.host.id, 10);
        expect(() => api.enrollHost(first.token, inventory)).toThrow('invalid or expired');
        vi.useFakeTimers(); vi.setSystemTime(Date.now() + 20);
        expect(() => api.enrollHost(next.token, inventory)).toThrow('invalid or expired');
    });
    it('rotates credentials independently and immediately revokes access', async () => {
        const api = await enrolled(); const other = api.createHost({ name: 'Other' }); const second = api.enrollHost(api.createEnrollment(other.id).token, inventory);
        const rotated = api.rotateCredential(api.host.id);
        expect(api.authenticateCredential(api.credentials.credential)).toBeNull(); expect(api.authenticateCredential(rotated)?.id).toBe(api.host.id);
        api.revokeCredentials(api.host.id);
        expect(api.authenticateCredential(rotated)).toBeNull(); expect(api.authenticateCredential(second.credential)?.id).toBe(other.id);
    });
    it('requires HTTPS and blocks cross-origin management and agent credentials on management APIs', async () => {
        const api = await enrolled(); const { authenticateAgent, requireManagementOrigin } = await import('../../src/lib/server/hosts/http.js');
        const headers = { authorization: `Bearer ${api.credentials.credential}` };
        expect(authenticateAgent(new Request('https://ec.test/api/agent/operations', { headers })).id).toBe(api.host.id);
        expect(() => authenticateAgent(new Request('http://ec.test/api/agent/operations', { headers }))).toThrow();
        expect(() => authenticateAgent(new Request('https://ec.test/api/agent/operations', { headers: { authorization: `Bearer ${api.enrollment.token}` } }))).toThrow();
        expect(() => requireManagementOrigin(new Request('https://ec.test/api/hosts', { headers }))).toThrow();
        expect(() => requireManagementOrigin(new Request('https://ec.test/api/hosts', { headers: { Origin: 'https://attacker.test' } }))).toThrow();
    });
    it('recovers credential rotation when acknowledgement is lost using the agent-persisted replacement', async () => {
        const api = await enrolled(); const next = 'ec_host_' + randomBytes(32).toString('base64url');
        expect(api.rotateCredential(api.host.id, next)).toBe(next);
        expect(api.authenticateCredential(api.credentials.credential)).toBeNull();
        expect(api.authenticateCredential(next)?.id).toBe(api.host.id);
        expect(api.rotateCredential(api.host.id, next)).toBe(next);
        api.revokeCredentials(api.host.id); expect(() => api.rotateCredential(api.host.id, next)).toThrow('cannot be reused');
    });
    it('bounds chunked request bodies before consuming the complete upload', async () => {
        const { objectBody } = await import('../../src/lib/server/hosts/http.js');
        let cancelled = false;
        const body = new ReadableStream<Uint8Array>({ pull(controller) { controller.enqueue(new TextEncoder().encode('x'.repeat(100))); }, cancel() { cancelled = true; } });
        const request = new Request('https://ec.test/api/agent/operations/x', { method: 'POST', body, duplex: 'half' } as RequestInit);
        await expect(objectBody(request, 50)).rejects.toMatchObject({ status: 413 });
        expect(cancelled).toBe(true);
    });
});

describe('native host readiness and reservations', () => {
    it('separates a connected agent from ready Docker, storage, runtime and library state', async () => {
        const api = await enrolled();
        expect(api.requireReadyHost(api.host.id).readiness).toBe('ready');
        expect(() => api.requireReadyHost(api.host.id, { image: 'missing:image' })).toThrow('runtime');
        expect(() => api.requireReadyHost(api.host.id, { libraryId: 'missing' })).toThrow('library');
        expect(api.heartbeat(api.host.id, { ...inventory, libraries: [] }).readiness).toBe('needs-game-files');
        const host = api.heartbeat(api.host.id, { ...inventory, dockerRunning: false });
        expect(host.connected).toBe(true); expect(host.readiness).toBe('degraded');
        expect(() => api.requireReadyHost(host.id)).toThrow('Docker');
        api.heartbeat(host.id, inventory);
        vi.useFakeTimers(); vi.setSystemTime(Date.now() + 91_000);
        expect(api.getHost(host.id)?.connectionState).toBe('offline'); expect(() => api.requireReadyHost(host.id)).toThrow('stale');
    });
    it.each([
        { missing: { libraries: [] }, expected: 'needs-game-files' },
        { missing: { runtimeImages: [] }, expected: 'needs-runtime' },
        { missing: { runtimeImages: [], libraries: [] }, expected: 'needs-runtime' }
    ])('names missing content as $expected until a prepared heartbeat arrives', async ({ missing, expected }) => {
        const api = await enrolled();
        const host = api.heartbeat(api.host.id, { ...inventory, ...missing });
        expect(host.connected).toBe(true);
        expect(host.readiness).toBe(expected);
        expect(() => api.requireReadyHost(host.id)).toThrow();
        expect(api.heartbeat(host.id, inventory).readiness).toBe('ready');
        expect(api.requireReadyHost(host.id).id).toBe(host.id);
    });
    it('keeps setup work deliverable while new instance creation waits for missing game files', async () => {
        const api = await enrolled();
        const create = api.queueHostOperation(api.host.id, 'instance.create', {});
        api.heartbeat(api.host.id, { ...inventory, libraries: [] });
        expect(() => api.queueHostOperation(api.host.id, 'instance.create', {})).toThrow('game-file library');
        const download = api.queueHostOperation(api.host.id, 'library.download', {});
        const runtime = api.queueHostOperation(api.host.id, 'runtime.pull', {});
        expect(api.pendingHostOperations(api.host.id).map(operation => operation.id)).toEqual([download.id, runtime.id]);
        api.heartbeat(api.host.id, { ...inventory, runtimeImages: [], libraries: [] });
        expect(api.pendingHostOperations(api.host.id).map(operation => operation.id)).toEqual([download.id, runtime.id]);
        api.heartbeat(api.host.id, inventory);
        expect(api.pendingHostOperations(api.host.id).map(operation => operation.id)).toContain(create.id);
    });
    it('gives enrollment, infrastructure failure and host modes priority over missing content', async () => {
        const api = await enrolled();
        expect(api.createHost({ name: 'New host' }).readiness).toBe('preparing');
        expect(api.heartbeat(api.host.id, { ...inventory, libraries: [], dockerRunning: false }).readiness).toBe('degraded');
        api.heartbeat(api.host.id, { ...inventory, libraries: [] });
        expect(api.updateHost(api.host.id, { mode: 'draining' }).readiness).toBe('draining');
        expect(api.updateHost(api.host.id, { mode: 'disabled' }).readiness).toBe('disabled');
    });
    it('blocks new deployments on a draining or disabled host without altering existing operations', async () => {
        const api = await enrolled(); const existing = api.queueHostOperation(api.host.id, 'instance.inspect', {}, { instanceId: 'immutable-id', generation: 1 });
        api.updateHost(api.host.id, { mode: 'draining' });
        expect(() => api.queueHostOperation(api.host.id, 'instance.create', {})).toThrow('draining');
        expect(api.getHostOperation(existing.id)?.state).toBe('pending');
        api.updateHost(api.host.id, { mode: 'disabled' }); expect(api.pendingHostOperations(api.host.id)).toEqual([]);
    });
    it('allocates per host, bind address and protocol while protecting wildcard bindings', async () => {
        const api = await enrolled(); const second = api.createHost({ name: 'Other' });
        expect(api.reserveHostPort(api.host.id, 'a', { port: 28960 })).toBe(28960);
        expect(api.reserveHostPort(second.id, 'b', { port: 28960 })).toBe(28960);
        expect(api.reserveHostPort(api.host.id, 'c', { port: 28960, protocol: 'tcp' })).toBe(28960);
        expect(() => api.reserveHostPort(api.host.id, 'd', { port: 28960, bindAddress: '127.0.0.1' })).toThrow('available');
        expect(api.reserveHostPort(api.host.id, 'a', { port: 28960 })).toBe(28960);
        api.releaseHostPorts('a');
        expect(api.reserveHostPort(api.host.id, 'e', { port: 28960, bindAddress: '127.0.0.1' })).toBe(28960);
        expect(api.reserveHostPort(api.host.id, 'f', { port: 28960, bindAddress: '127.0.0.2' })).toBe(28960);
        expect(() => api.reserveHostPort(api.host.id, 'g', { port: 28960, bindAddress: '0.0.0.0' })).toThrow('available');
        expect(() => api.reserveHostPort(api.host.id, 'h', { port: 28000 })).toThrow('available');
    });
});

describe('durable host operations', () => {
    it('drains an old agent for a cancellation update while allowing receipts, heartbeats, and other hosts', async () => {
        const api = await enrolled();
        const original = api.queueHostOperation(api.host.id, 'instance.create', {}, { instanceId: 'cancelled-instance', generation: 1 });
        const inspect = api.queueHostOperation(api.host.id, 'instance.inspect', {});
        expect(api.pendingHostOperations(api.host.id).map(op => op.id)).toContain(original.id);
        api.reportHostOperation(api.host.id, original.id, { state: 'running' });
        api.reportHostOperation(api.host.id, inspect.id, { state: 'unknown' });
        const cleanup = api.queueHostOperation(api.host.id, 'instance.cancel-create', { createOperationId: original.id }, { instanceId: 'cancelled-instance', generation: 1 });
        const logs = api.queueHostOperation(api.host.id, 'logs.read', {});
        const preparation = api.queueHostOperation(api.host.id, 'library.download', {});
        const other = api.createHost({ name: 'Unaffected host' });
        api.enrollHost(api.createEnrollment(other.id).token, inventory);
        const otherWork = api.queueHostOperation(other.id, 'host.inspect', {});
        const { db } = await import('../../src/lib/server/db/index.js');
        const before = db().prepare('SELECT id,state,last_delivered_at FROM ec_host_operations WHERE host_id=? ORDER BY id').all(api.host.id);
        for (let poll = 0; poll < 3; poll++) expect(api.pendingHostOperations(api.host.id)).toEqual([]);
        expect(db().prepare('SELECT id,state,last_delivered_at FROM ec_host_operations WHERE host_id=? ORDER BY id').all(api.host.id)).toEqual(before);
        expect(api.pendingHostOperations(other.id).map(op => op.id)).toEqual([otherWork.id]);
        api.reportHostOperation(api.host.id, inspect.id, { state: 'completed', result: { healthy: true } });
        api.heartbeat(api.host.id, inventory);
        expect(api.pendingHostOperations(api.host.id)).toEqual([]);

        // The controller hold must clear on capability, without waiting for cleanup
        // or the original creation to finish (which would recreate the deadlock).
        api.heartbeat(api.host.id, { ...inventory, capabilities: ['instance.cancel-create'] });
        expect(api.pendingHostOperations(api.host.id).map(op => op.id)).toEqual([cleanup.id, logs.id, preparation.id]);
        expect(api.getHostOperation(original.id)?.state).toBe('running');
        expect(api.getHostOperation(cleanup.id)?.state).toBe('pending');
    });

    it.each(['completed', 'failed'] as const)('does not pause an old host for a terminal %s cancellation', async state => {
        const api = await enrolled();
        const cleanup = api.queueHostOperation(api.host.id, 'instance.cancel-create', { createOperationId: 'creation' });
        api.reportHostOperation(api.host.id, cleanup.id, { state });
        const work = api.queueHostOperation(api.host.id, 'host.inspect', {});
        expect(api.pendingHostOperations(api.host.id).map(op => op.id)).toEqual([work.id]);
    });
    it('rotates unresolved operation delivery so an old batch cannot starve new work', async () => {
        const api = await enrolled();
        const operations = Array.from({ length: 30 }, () => api.queueHostOperation(api.host.id, 'instance.inspect', {}));
        operations.forEach(operation => api.reportHostOperation(api.host.id, operation.id, { state: 'unknown' }));
        const first = api.pendingHostOperations(api.host.id).map(operation => operation.id);
        const second = api.pendingHostOperations(api.host.id).map(operation => operation.id);
        expect(new Set([...first, ...second]).size).toBe(30);
        expect(operations.every(operation => api.getHostOperation(operation.id)?.state === 'unknown')).toBe(true);
    });
    it('reconciles the same operation ID after loss of acknowledgement and prevents duplicate side effects', async () => {
        const api = await enrolled(); const options = { instanceId: 'immutable-id', generation: 4, idempotencyKey: 'provisioning:123' };
        const operation = api.queueHostOperation(api.host.id, 'instance.restart', {}, options);
        api.reportHostOperation(api.host.id, operation.id, { state: 'accepted' }); api.reportHostOperation(api.host.id, operation.id, { state: 'running' });
        expect(api.queueHostOperation(api.host.id, 'instance.restart', {}, options).id).toBe(operation.id);
        expect(api.pendingHostOperations(api.host.id).map(value => value.id)).toEqual([operation.id]);
        expect(() => api.queueHostOperation(api.host.id, 'instance.stop', {}, options)).toThrow('different request');
        api.reportHostOperation(api.host.id, operation.id, { state: 'completed', result: { restarted: true } });
        expect(api.reportHostOperation(api.host.id, operation.id, { state: 'running' }).state).toBe('completed');
        expect(api.pendingHostOperations(api.host.id)).toEqual([]);
        expect((await api.waitHostOperation(operation.id)).result).toEqual({ restarted: true });
    });
    it('does not allow another host to report a result, and timeouts retain the original operation', async () => {
        const api = await enrolled(); const other = api.createHost({ name: 'Other' }); const operation = api.queueHostOperation(api.host.id, 'instance.stop', {});
        expect(() => api.reportHostOperation(other.id, operation.id, { state: 'completed' })).toThrow('this host');
        await expect(api.waitHostOperation(operation.id, 0)).rejects.toThrow(operation.id);
        expect(api.getHostOperation(operation.id)?.state).toBe('pending');
    });
});