import { containerTest } from "@internal/testcontainers";
import { trace } from "@internal/tracing";
import { describe, expect, vi } from "vitest";
import type { TriggerScheduledTaskParams } from "../src/engine/types.js";
import { ScheduleEngine } from "../src/index.js";

describe("Schedule Recovery", () => {
  containerTest(
    "should recover schedules when no existing jobs are found",
    { timeout: 30_000 },
    async ({ prisma, redisOptions }) => {
      const mockDevConnectedHandler = vi.fn().mockResolvedValue(true);
      const triggerCalls: TriggerScheduledTaskParams[] = [];

      const engine = new ScheduleEngine({
        prisma,
        redis: redisOptions,
        distributionWindow: { seconds: 10 },
        worker: {
          concurrency: 1,
          disabled: true, // Disable worker to prevent automatic execution
          pollIntervalMs: 1000,
        },
        tracer: trace.getTracer("test", "0.0.0"),
        onTriggerScheduledTask: async (params) => {
          triggerCalls.push(params);
          return { success: true };
        },
        isDevEnvironmentConnectedHandler: mockDevConnectedHandler,
      });

      try {
        // Create test data
        const organization = await prisma.organization.create({
          data: {
            title: "Recovery Test Org",
            slug: "recovery-test-org",
          },
        });

        const project = await prisma.project.create({
          data: {
            name: "Recovery Test Project",
            slug: "recovery-test-project",
            externalRef: "recovery-test-ref",
            organizationId: organization.id,
          },
        });

        const environment = await prisma.runtimeEnvironment.create({
          data: {
            slug: "recovery-test-env",
            type: "PRODUCTION",
            projectId: project.id,
            organizationId: organization.id,
            apiKey: "tr_recovery_test_1234",
            pkApiKey: "pk_recovery_test_1234",
            shortcode: "recovery-test-short",
          },
        });

        const taskSchedule = await prisma.taskSchedule.create({
          data: {
            friendlyId: "sched_recovery_123",
            taskIdentifier: "recovery-test-task",
            projectId: project.id,
            deduplicationKey: "recovery-test-dedup",
            userProvidedDeduplicationKey: false,
            generatorExpression: "0 */5 * * *", // Every 5 minutes
            generatorDescription: "Every 5 minutes",
            timezone: "UTC",
            type: "DECLARATIVE",
            active: true,
            externalId: "recovery-ext-123",
          },
        });

        const scheduleInstance = await prisma.taskScheduleInstance.create({
          data: {
            taskScheduleId: taskSchedule.id,
            environmentId: environment.id,
            projectId: project.id,
            active: true,
          },
        });

        // Verify no job exists initially
        const jobBeforeRecovery = await engine.getJob(
          `scheduled-task-instance:${scheduleInstance.id}`
        );
        expect(jobBeforeRecovery).toBeNull();

        // Perform recovery
        await engine.recoverSchedulesInEnvironment(project.id, environment.id);

        // Verify that a job was created. The engine no longer persists
        // nextScheduledTimestamp; correctness is now determined entirely by the
        // job sitting in the worker queue.
        const jobAfterRecovery = await engine.getJob(
          `scheduled-task-instance:${scheduleInstance.id}`
        );
        expect(jobAfterRecovery).not.toBeNull();
        expect(jobAfterRecovery?.job).toBe("schedule.triggerScheduledTask");
      } finally {
        await engine.quit();
      }
    }
  );

  containerTest(
    "should not create duplicate jobs when schedule already has an active job",
    { timeout: 30_000 },
    async ({ prisma, redisOptions }) => {
      const mockDevConnectedHandler = vi.fn().mockResolvedValue(true);
      const triggerCalls: TriggerScheduledTaskParams[] = [];

      const engine = new ScheduleEngine({
        prisma,
        redis: redisOptions,
        distributionWindow: { seconds: 10 },
        worker: {
          concurrency: 1,
          disabled: true, // Disable worker to prevent automatic execution
          pollIntervalMs: 1000,
        },
        tracer: trace.getTracer("test", "0.0.0"),
        onTriggerScheduledTask: async (params) => {
          triggerCalls.push(params);
          return { success: true };
        },
        isDevEnvironmentConnectedHandler: mockDevConnectedHandler,
      });

      try {
        // Create test data
        const organization = await prisma.organization.create({
          data: {
            title: "Duplicate Test Org",
            slug: "duplicate-test-org",
          },
        });

        const project = await prisma.project.create({
          data: {
            name: "Duplicate Test Project",
            slug: "duplicate-test-project",
            externalRef: "duplicate-test-ref",
            organizationId: organization.id,
          },
        });

        const environment = await prisma.runtimeEnvironment.create({
          data: {
            slug: "duplicate-test-env",
            type: "PRODUCTION",
            projectId: project.id,
            organizationId: organization.id,
            apiKey: "tr_duplicate_test_1234",
            pkApiKey: "pk_duplicate_test_1234",
            shortcode: "duplicate-test-short",
          },
        });

        const taskSchedule = await prisma.taskSchedule.create({
          data: {
            friendlyId: "sched_duplicate_123",
            taskIdentifier: "duplicate-test-task",
            projectId: project.id,
            deduplicationKey: "duplicate-test-dedup",
            userProvidedDeduplicationKey: false,
            generatorExpression: "0 */10 * * *", // Every 10 minutes
            generatorDescription: "Every 10 minutes",
            timezone: "UTC",
            type: "DECLARATIVE",
            active: true,
            externalId: "duplicate-ext-123",
          },
        });

        const scheduleInstance = await prisma.taskScheduleInstance.create({
          data: {
            taskScheduleId: taskSchedule.id,
            environmentId: environment.id,
            projectId: project.id,
            active: true,
          },
        });

        // First, register the schedule normally
        await engine.registerNextTaskScheduleInstance({ instanceId: scheduleInstance.id });

        // Verify job exists
        const jobAfterFirstRegistration = await engine.getJob(
          `scheduled-task-instance:${scheduleInstance.id}`
        );
        expect(jobAfterFirstRegistration).not.toBeNull();
        const firstJobId = jobAfterFirstRegistration?.id;

        // Now run recovery - it should not create a duplicate job
        await engine.recoverSchedulesInEnvironment(project.id, environment.id);

        // Verify the same job still exists (no duplicate created)
        const jobAfterRecovery = await engine.getJob(
          `scheduled-task-instance:${scheduleInstance.id}`
        );
        expect(jobAfterRecovery).not.toBeNull();
        expect(jobAfterRecovery?.id).toBe(firstJobId);
        expect(jobAfterRecovery?.deduplicationKey).toBe(jobAfterFirstRegistration.deduplicationKey);
      } finally {
        await engine.quit();
      }
    }
  );

  containerTest(
    "should recover multiple schedules in the same environment",
    { timeout: 30_000 },
    async ({ prisma, redisOptions }) => {
      const mockDevConnectedHandler = vi.fn().mockResolvedValue(true);
      const triggerCalls: TriggerScheduledTaskParams[] = [];

      const engine = new ScheduleEngine({
        prisma,
        redis: redisOptions,
        distributionWindow: { seconds: 10 },
        worker: {
          concurrency: 1,
          disabled: true, // Disable worker to prevent automatic execution
          pollIntervalMs: 1000,
        },
        tracer: trace.getTracer("test", "0.0.0"),
        onTriggerScheduledTask: async (params) => {
          triggerCalls.push(params);
          return { success: true };
        },
        isDevEnvironmentConnectedHandler: mockDevConnectedHandler,
      });

      try {
        // Create test data
        const organization = await prisma.organization.create({
          data: {
            title: "Multiple Test Org",
            slug: "multiple-test-org",
          },
        });

        const project = await prisma.project.create({
          data: {
            name: "Multiple Test Project",
            slug: "multiple-test-project",
            externalRef: "multiple-test-ref",
            organizationId: organization.id,
          },
        });

        const environment = await prisma.runtimeEnvironment.create({
          data: {
            slug: "multiple-test-env",
            type: "PRODUCTION",
            projectId: project.id,
            organizationId: organization.id,
            apiKey: "tr_multiple_test_1234",
            pkApiKey: "pk_multiple_test_1234",
            shortcode: "multiple-test-short",
          },
        });

        // Create multiple task schedules
        const schedules = [];
        const instances = [];

        for (let i = 1; i <= 3; i++) {
          const taskSchedule = await prisma.taskSchedule.create({
            data: {
              friendlyId: `sched_multiple_${i}`,
              taskIdentifier: `multiple-test-task-${i}`,
              projectId: project.id,
              deduplicationKey: `multiple-test-dedup-${i}`,
              userProvidedDeduplicationKey: false,
              generatorExpression: `${i} */15 * * *`, // Every 15 minutes at different minute offsets
              generatorDescription: `Every 15 minutes (${i})`,
              timezone: "UTC",
              type: "DECLARATIVE",
              active: true,
              externalId: `multiple-ext-${i}`,
            },
          });

          const scheduleInstance = await prisma.taskScheduleInstance.create({
            data: {
              taskScheduleId: taskSchedule.id,
              environmentId: environment.id,
              projectId: project.id,
              active: true,
            },
          });

          schedules.push(taskSchedule);
          instances.push(scheduleInstance);
        }

        // Verify no jobs exist initially
        for (const instance of instances) {
          const job = await engine.getJob(`scheduled-task-instance:${instance.id}`);
          expect(job).toBeNull();
        }

        // Perform recovery
        await engine.recoverSchedulesInEnvironment(project.id, environment.id);

        // Verify that jobs were created for all instances. The engine no longer
        // persists nextScheduledTimestamp — the worker-queue presence is the
        // source of truth.
        for (const instance of instances) {
          const job = await engine.getJob(`scheduled-task-instance:${instance.id}`);
          expect(job).not.toBeNull();
          expect(job?.job).toBe("schedule.triggerScheduledTask");
        }
      } finally {
        await engine.quit();
      }
    }
  );

  containerTest(
    "should handle recovery gracefully when no schedules exist in environment",
    { timeout: 30_000 },
    async ({ prisma, redisOptions }) => {
      const mockDevConnectedHandler = vi.fn().mockResolvedValue(true);
      const triggerCalls: TriggerScheduledTaskParams[] = [];

      const engine = new ScheduleEngine({
        prisma,
        redis: redisOptions,
        distributionWindow: { seconds: 10 },
        worker: {
          concurrency: 1,
          disabled: true, // Disable worker to prevent automatic execution
          pollIntervalMs: 1000,
        },
        tracer: trace.getTracer("test", "0.0.0"),
        onTriggerScheduledTask: async (params) => {
          triggerCalls.push(params);
          return { success: true };
        },
        isDevEnvironmentConnectedHandler: mockDevConnectedHandler,
      });

      try {
        // Create test data but no schedules
        const organization = await prisma.organization.create({
          data: {
            title: "Empty Test Org",
            slug: "empty-test-org",
          },
        });

        const project = await prisma.project.create({
          data: {
            name: "Empty Test Project",
            slug: "empty-test-project",
            externalRef: "empty-test-ref",
            organizationId: organization.id,
          },
        });

        const environment = await prisma.runtimeEnvironment.create({
          data: {
            slug: "empty-test-env",
            type: "PRODUCTION",
            projectId: project.id,
            organizationId: organization.id,
            apiKey: "tr_empty_test_1234",
            pkApiKey: "pk_empty_test_1234",
            shortcode: "empty-test-short",
          },
        });

        // Perform recovery on empty environment - should not throw errors
        await expect(
          engine.recoverSchedulesInEnvironment(project.id, environment.id)
        ).resolves.not.toThrow();
      } finally {
        await engine.quit();
      }
    }
  );

  // External-caller backward-compat. Deploy sync (`syncDeclarativeSchedules`)
  // and schedule upsert both call `registerNextTaskScheduleInstance` with no
  // `lastScheduleTime`. They run on every app deploy and on every cron edit.
  // For an existing-and-firing schedule, the call must NOT clobber the
  // worker payload's `lastScheduleTime` with `undefined` — otherwise the
  // next fire would surface a stale frozen DB-column value to the customer
  // (since this PR stops writing that column). The function must derive a
  // sensible `lastScheduleTime` from the cron expression's previous slot
  // when the caller doesn't pass one.
  containerTest(
    "should derive lastScheduleTime from cron when external callers omit it",
    { timeout: 30_000 },
    async ({ prisma, redisOptions }) => {
      const engine = new ScheduleEngine({
        prisma,
        redis: redisOptions,
        distributionWindow: { seconds: 10 },
        worker: { concurrency: 1, disabled: true, pollIntervalMs: 1000 },
        tracer: trace.getTracer("test", "0.0.0"),
        onTriggerScheduledTask: async () => ({ success: true }),
        isDevEnvironmentConnectedHandler: vi.fn().mockResolvedValue(true),
      });

      try {
        const organization = await prisma.organization.create({
          data: { title: "External Caller Org", slug: "external-caller-org" },
        });
        const project = await prisma.project.create({
          data: {
            name: "External Caller Project",
            slug: "external-caller-project",
            externalRef: "external-caller-ref",
            organizationId: organization.id,
          },
        });
        const environment = await prisma.runtimeEnvironment.create({
          data: {
            slug: "external-caller-env",
            type: "PRODUCTION",
            projectId: project.id,
            organizationId: organization.id,
            apiKey: "tr_external_1234",
            pkApiKey: "pk_external_1234",
            shortcode: "external-short",
          },
        });
        const taskSchedule = await prisma.taskSchedule.create({
          data: {
            friendlyId: "sched_external_caller",
            taskIdentifier: "external-caller-task",
            projectId: project.id,
            deduplicationKey: "external-caller-dedup",
            userProvidedDeduplicationKey: false,
            generatorExpression: "*/5 * * * *",
            generatorDescription: "Every 5 minutes",
            timezone: "UTC",
            type: "DECLARATIVE",
            active: true,
          },
        });

        // Backdate the instance so the cron's previous slot postdates
        // createdAt — this simulates a long-running schedule, the case
        // Devin flagged (deploy clobbers lastScheduleTime, post-deploy fire
        // would otherwise read from a frozen DB column).
        const longAgo = new Date(Date.now() - 24 * 60 * 60 * 1000);
        const scheduleInstance = await prisma.taskScheduleInstance.create({
          data: {
            taskScheduleId: taskSchedule.id,
            environmentId: environment.id,
            projectId: project.id,
            active: true,
          },
        });
        await prisma.taskScheduleInstance.update({
          where: { id: scheduleInstance.id },
          data: { createdAt: longAgo },
        });

        // External-caller pattern — no lastScheduleTime.
        await engine.registerNextTaskScheduleInstance({
          instanceId: scheduleInstance.id,
        });

        const job = await engine.getJob(`scheduled-task-instance:${scheduleInstance.id}`);
        expect(job).not.toBeNull();
        // The function should have derived lastScheduleTime from cron,
        // putting a real timestamp into the worker payload rather than
        // undefined. The Redis worker stores payloads as JSON, so the value
        // is a string when read back here — Zod re-coerces it to Date on
        // dequeue (workerCatalog uses `z.coerce.date()`).
        const enqueuedLastScheduleTime = (job!.item as { lastScheduleTime?: string })
          .lastScheduleTime;
        expect(enqueuedLastScheduleTime).toBeDefined();
        const derived = new Date(enqueuedLastScheduleTime!);
        // The derived value should match the cron's previous slot — for
        // `*/5 * * * *`, a 5-minute boundary in the recent past.
        expect(derived.getTime()).toBeLessThan(Date.now());
        expect(derived.getUTCSeconds()).toBe(0);
        expect(derived.getUTCMinutes() % 5).toBe(0);
      } finally {
        await engine.quit();
      }
    }
  );

  // Brand-new schedules must NOT receive a cron-derived lastScheduleTime —
  // the cron's previous slot predates the instance, so it's not a real
  // previous fire. The first-run sentinel (`if (!payload.lastTimestamp)`)
  // must keep working.
  containerTest(
    "should leave lastScheduleTime undefined for brand-new schedules",
    { timeout: 30_000 },
    async ({ prisma, redisOptions }) => {
      const engine = new ScheduleEngine({
        prisma,
        redis: redisOptions,
        distributionWindow: { seconds: 10 },
        worker: { concurrency: 1, disabled: true, pollIntervalMs: 1000 },
        tracer: trace.getTracer("test", "0.0.0"),
        onTriggerScheduledTask: async () => ({ success: true }),
        isDevEnvironmentConnectedHandler: vi.fn().mockResolvedValue(true),
      });

      try {
        const organization = await prisma.organization.create({
          data: { title: "Brand New Org", slug: "brand-new-org" },
        });
        const project = await prisma.project.create({
          data: {
            name: "Brand New Project",
            slug: "brand-new-project",
            externalRef: "brand-new-ref",
            organizationId: organization.id,
          },
        });
        const environment = await prisma.runtimeEnvironment.create({
          data: {
            slug: "brand-new-env",
            type: "PRODUCTION",
            projectId: project.id,
            organizationId: organization.id,
            apiKey: "tr_brandnew_1234",
            pkApiKey: "pk_brandnew_1234",
            shortcode: "brandnew-short",
          },
        });
        const taskSchedule = await prisma.taskSchedule.create({
          data: {
            friendlyId: "sched_brand_new",
            taskIdentifier: "brand-new-task",
            projectId: project.id,
            deduplicationKey: "brand-new-dedup",
            userProvidedDeduplicationKey: false,
            // Hourly cron — the previous slot is plausibly minutes-to-an-hour
            // ago, comfortably predating an instance just created.
            generatorExpression: "0 * * * *",
            generatorDescription: "Hourly",
            timezone: "UTC",
            type: "DECLARATIVE",
            active: true,
          },
        });
        const scheduleInstance = await prisma.taskScheduleInstance.create({
          data: {
            taskScheduleId: taskSchedule.id,
            environmentId: environment.id,
            projectId: project.id,
            active: true,
          },
        });

        await engine.registerNextTaskScheduleInstance({
          instanceId: scheduleInstance.id,
        });

        const job = await engine.getJob(`scheduled-task-instance:${scheduleInstance.id}`);
        expect(job).not.toBeNull();
        const enqueuedLastScheduleTime = (job!.item as { lastScheduleTime?: Date })
          .lastScheduleTime;
        // Brand-new schedule: cron's previous slot predates instance.createdAt,
        // so the function leaves lastScheduleTime undefined — the first fire
        // will report `payload.lastTimestamp: undefined` and customer first-run
        // sentinel patterns keep working.
        expect(enqueuedLastScheduleTime).toBeUndefined();
      } finally {
        await engine.quit();
      }
    }
  );
});