/**
 * Integration tests for the SSE progress tracking system.
 *
 * The GET /api/v1/jobs/:jobId/progress endpoint uses reply.hijack()
 * for SSE streaming, which makes it incompatible with Fastify's inject()
 * (inject never completes for hijacked responses that wait for events).
 *
 * Instead, we test progress tracking indirectly through batch and pipeline
 * batch routes that drive updateJobProgress() and verify:
 *   - X-Job-Id header presence (job was tracked)
 *   - clientJobId passthrough (custom IDs are used)
 *   - Completed batch with progress tracking
 *   - Pipeline batch progress tracking
 *   - Job persistence in the database
 */

import { randomUUID } from "node:crypto";
import { readFileSync } from "node:fs";
import { join } from "node:path";
import { eq } from "drizzle-orm";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import { db, schema } from "../../apps/api/src/db/index.js";
import {
  recoverStaleJobs,
  updateJobProgress,
  updateSingleFileProgress,
} from "../../apps/api/src/routes/progress.js";
import { buildTestApp, createMultipartPayload, loginAsAdmin, type TestApp } from "./test-server.js";

const FIXTURES = join(__dirname, "..", "fixtures");
const PNG = readFileSync(join(FIXTURES, "test-200x150.png"));
const JPG = readFileSync(join(FIXTURES, "test-100x100.jpg"));

let testApp: TestApp;
let app: TestApp["app"];
let adminToken: string;

beforeAll(async () => {
  testApp = await buildTestApp();
  app = testApp.app;
  adminToken = await loginAsAdmin(app);
}, 30_000);

afterAll(async () => {
  await testApp.cleanup();
}, 10_000);

// ── Batch progress tracking via X-Job-Id ────────────────────────
describe("Batch progress tracking", () => {
  it("assigns a job ID to batch operations", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({ width: 50 }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/resize/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const jobId = res.headers["x-job-id"] as string;
    expect(jobId).toBeDefined();
    expect(jobId.length).toBeGreaterThan(0);
  });

  it("uses client-provided job ID when clientJobId is supplied", async () => {
    const clientJobId = randomUUID();

    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "track.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ width: 80 }) },
      { name: "clientJobId", content: clientJobId },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/resize/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    expect(res.headers["x-job-id"]).toBe(clientJobId);
  });

  it("persists job progress to the database after batch completes", async () => {
    const clientJobId = randomUUID();

    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "persist.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "persist2.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({ width: 60 }) },
      { name: "clientJobId", content: clientJobId },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/resize/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    expect(res.statusCode).toBe(200);

    // Check the jobs table for the persisted progress
    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, clientJobId)).get();

    expect(job).toBeDefined();
    expect(job?.status).toBe("completed");
    expect(job?.progress).toBe(1); // 100% complete
    expect(job?.completedAt).not.toBeNull();
  });

  it("persists failed job status to the database", async () => {
    // Provide an invalid file (empty buffer won't be uploaded, so all fail)
    const clientJobId = randomUUID();

    const { body, contentType } = createMultipartPayload([
      {
        name: "file",
        filename: "bad.txt",
        contentType: "text/plain",
        content: Buffer.from("not an image"),
      },
      { name: "settings", content: JSON.stringify({ width: 50 }) },
      { name: "clientJobId", content: clientJobId },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/resize/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    // Should fail (422 = all files failed)
    expect(res.statusCode).toBe(422);

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, clientJobId)).get();

    expect(job).toBeDefined();
    expect(job?.status).toBe("failed");
  });

  it("tracks progress for multi-file batch with partial success", async () => {
    const clientJobId = randomUUID();

    // Mix valid image + invalid data — partial success
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "good.png", contentType: "image/png", content: PNG },
      {
        name: "file",
        filename: "bad.txt",
        contentType: "text/plain",
        content: Buffer.from("not an image"),
      },
      { name: "settings", content: JSON.stringify({ width: 50 }) },
      { name: "clientJobId", content: clientJobId },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/resize/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    // Should succeed (at least one file processed)
    expect(res.statusCode).toBe(200);

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, clientJobId)).get();

    expect(job).toBeDefined();
    expect(job?.status).toBe("completed");
    // Should have error info for the failed file
    if (job?.error) {
      const errors = JSON.parse(job?.error);
      expect(errors.length).toBeGreaterThanOrEqual(1);
    }
  });
});

// ── Pipeline batch progress ─────────────────────────────────────
describe("Pipeline batch progress tracking", () => {
  it("tracks progress during pipeline batch execution", async () => {
    const clientJobId = randomUUID();

    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "pipe1.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "pipe2.jpg", contentType: "image/jpeg", content: JPG },
      {
        name: "pipeline",
        content: JSON.stringify({
          steps: [{ toolId: "resize", settings: { width: 50 } }],
        }),
      },
      { name: "clientJobId", content: clientJobId },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/pipeline/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    expect(res.headers["x-job-id"]).toBe(clientJobId);

    // Verify DB persistence
    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, clientJobId)).get();

    expect(job).toBeDefined();
    expect(job?.status).toBe("completed");
  });

  it("pipeline batch generates job ID when not provided", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "auto.png", contentType: "image/png", content: PNG },
      {
        name: "pipeline",
        content: JSON.stringify({
          steps: [{ toolId: "rotate", settings: { angle: 90 } }],
        }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/pipeline/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const jobId = res.headers["x-job-id"] as string;
    expect(jobId).toBeDefined();
    expect(jobId.length).toBeGreaterThan(0);
  });
});

// ── Job DB record structure ─────────────────────────────────────
describe("Job DB record structure", () => {
  it("persisted job contains expected fields", async () => {
    const clientJobId = randomUUID();

    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "fields.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ width: 70 }) },
      { name: "clientJobId", content: clientJobId },
    ]);

    await app.inject({
      method: "POST",
      url: "/api/v1/tools/resize/batch",
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
      body,
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, clientJobId)).get();

    expect(job).toBeDefined();
    expect(job?.id).toBe(clientJobId);
    expect(job?.type).toBe("batch");
    expect(typeof job?.progress).toBe("number");
    expect(job?.progress).toBeGreaterThanOrEqual(0);
    expect(job?.progress).toBeLessThanOrEqual(1);
  });
});

// ── SSE endpoint ───────────────────────────────────────────────
describe("SSE progress endpoint", () => {
  it("returns SSE headers when connecting to progress stream", async () => {
    const jobId = randomUUID();

    // Pre-populate a completed job so the SSE endpoint sends it immediately and closes
    updateJobProgress({
      jobId,
      status: "completed",
      totalFiles: 1,
      completedFiles: 1,
      failedFiles: 0,
      errors: [],
    });

    const res = await app.inject({
      method: "GET",
      url: `/api/v1/jobs/${jobId}/progress`,
      headers: {
        authorization: `Bearer ${adminToken}`,
      },
    });

    // Hijacked responses return 200 (or -1 in some Fastify versions)
    // The important thing is we get SSE content back
    expect(res.statusCode).toBe(200);
    const body = res.body;
    // SSE events contain "data:" prefix
    expect(body).toContain("data:");

    // Parse the SSE data
    const dataMatch = body.match(/data: (.+)/);
    expect(dataMatch).not.toBeNull();
    const event = JSON.parse(dataMatch?.[1]);
    expect(event.status).toBe("completed");
    expect(event.type).toBe("batch");
  });

  it("SSE endpoint returns existing progress for failed job", async () => {
    const jobId = randomUUID();

    updateJobProgress({
      jobId,
      status: "failed",
      totalFiles: 2,
      completedFiles: 1,
      failedFiles: 1,
      errors: [{ filename: "bad.png", error: "Invalid image" }],
    });

    const res = await app.inject({
      method: "GET",
      url: `/api/v1/jobs/${jobId}/progress`,
      headers: {
        authorization: `Bearer ${adminToken}`,
      },
    });

    expect(res.statusCode).toBe(200);
    const body = res.body;
    const dataMatch = body.match(/data: (.+)/);
    expect(dataMatch).not.toBeNull();
    const event = JSON.parse(dataMatch?.[1]);
    expect(event.status).toBe("failed");
    expect(event.failedFiles).toBe(1);
    expect(event.errors).toHaveLength(1);
  });
});

// ── updateJobProgress direct tests ─────────────────────────────
describe("updateJobProgress direct calls", () => {
  it("persists job progress to the database for a new job", () => {
    const jobId = randomUUID();

    updateJobProgress({
      jobId,
      status: "processing",
      totalFiles: 5,
      completedFiles: 2,
      failedFiles: 0,
      errors: [],
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("processing");
    expect(job?.progress).toBeCloseTo(0.4, 1); // 2/5
    expect(job?.type).toBe("batch");
  });

  it("updates existing job progress in the database", () => {
    const jobId = randomUUID();

    // Create initial progress
    updateJobProgress({
      jobId,
      status: "processing",
      totalFiles: 3,
      completedFiles: 1,
      failedFiles: 0,
      errors: [],
    });

    // Update progress
    updateJobProgress({
      jobId,
      status: "completed",
      totalFiles: 3,
      completedFiles: 3,
      failedFiles: 0,
      errors: [],
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("completed");
    expect(job?.progress).toBe(1);
    expect(job?.completedAt).not.toBeNull();
  });

  it("persists errors to the database", () => {
    const jobId = randomUUID();

    updateJobProgress({
      jobId,
      status: "failed",
      totalFiles: 2,
      completedFiles: 0,
      failedFiles: 2,
      errors: [
        { filename: "a.png", error: "Invalid format" },
        { filename: "b.png", error: "Corrupt file" },
      ],
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("failed");
    expect(job?.error).not.toBeNull();
    const errors = JSON.parse(job?.error!);
    expect(errors).toHaveLength(2);
  });

  it("handles zero totalFiles without division by zero", () => {
    const jobId = randomUUID();

    updateJobProgress({
      jobId,
      status: "completed",
      totalFiles: 0,
      completedFiles: 0,
      failedFiles: 0,
      errors: [],
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.progress).toBe(0);
  });
});

// ── updateSingleFileProgress direct tests ──────────────────────
describe("updateSingleFileProgress direct calls", () => {
  it("persists single-file progress for new job", () => {
    const jobId = randomUUID();

    updateSingleFileProgress({
      jobId,
      phase: "processing",
      percent: 50,
      stage: "encoding",
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("processing");
    expect(job?.progress).toBeCloseTo(0.5, 1);
    expect(job?.type).toBe("single");
  });

  it("persists complete phase", () => {
    const jobId = randomUUID();

    updateSingleFileProgress({
      jobId,
      phase: "complete",
      percent: 100,
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("completed");
    expect(job?.progress).toBe(1);
    // completedAt is only set on UPDATE path (not INSERT for new jobs)
    expect(job?.type).toBe("single");
  });

  it("persists failed phase with error", () => {
    const jobId = randomUUID();

    updateSingleFileProgress({
      jobId,
      phase: "failed",
      percent: 30,
      error: "Processing timeout",
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("failed");
    expect(job?.error).toBe("Processing timeout");
    expect(job?.type).toBe("single");
  });

  it("sets completedAt when updating existing job to complete", () => {
    const jobId = randomUUID();

    // Create initial job
    updateSingleFileProgress({
      jobId,
      phase: "processing",
      percent: 50,
    });

    // Update to complete
    updateSingleFileProgress({
      jobId,
      phase: "complete",
      percent: 100,
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("completed");
    expect(job?.completedAt).not.toBeNull();
  });

  it("sets completedAt when updating existing job to failed", () => {
    const jobId = randomUUID();

    // Create initial job
    updateSingleFileProgress({
      jobId,
      phase: "processing",
      percent: 25,
    });

    // Update to failed
    updateSingleFileProgress({
      jobId,
      phase: "failed",
      percent: 25,
      error: "Timeout error",
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("failed");
    expect(job?.completedAt).not.toBeNull();
    expect(job?.error).toBe("Timeout error");
  });

  it("updates existing single-file job progress", () => {
    const jobId = randomUUID();

    // Create
    updateSingleFileProgress({
      jobId,
      phase: "processing",
      percent: 25,
      stage: "analyzing",
    });

    // Update
    updateSingleFileProgress({
      jobId,
      phase: "processing",
      percent: 75,
      stage: "encoding",
    });

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.progress).toBeCloseTo(0.75, 1);
  });
});

// ── recoverStaleJobs ───────────────────────────────────────────
describe("recoverStaleJobs", () => {
  it("marks processing jobs as failed on recovery", () => {
    const jobId = randomUUID();

    // Insert a processing job directly
    db.insert(schema.jobs)
      .values({
        id: jobId,
        type: "batch",
        status: "processing",
        progress: 0.5,
        inputFiles: "[]",
      })
      .run();

    recoverStaleJobs();

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("failed");
    expect(job?.error).toContain("Server restarted");
    expect(job?.completedAt).not.toBeNull();
  });

  it("marks queued jobs as failed on recovery", () => {
    const jobId = randomUUID();

    db.insert(schema.jobs)
      .values({
        id: jobId,
        type: "batch",
        status: "queued",
        progress: 0,
        inputFiles: "[]",
      })
      .run();

    recoverStaleJobs();

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("failed");
    expect(job?.error).toContain("Server restarted");
  });

  it("does not modify completed jobs", () => {
    const jobId = randomUUID();

    db.insert(schema.jobs)
      .values({
        id: jobId,
        type: "batch",
        status: "completed",
        progress: 1,
        inputFiles: "[]",
        completedAt: new Date(),
      })
      .run();

    recoverStaleJobs();

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.status).toBe("completed");
  });

  it("does not modify already-failed jobs", () => {
    const jobId = randomUUID();

    db.insert(schema.jobs)
      .values({
        id: jobId,
        type: "batch",
        status: "failed",
        progress: 0,
        inputFiles: "[]",
        error: "Original error",
        completedAt: new Date(),
      })
      .run();

    recoverStaleJobs();

    const job = db.select().from(schema.jobs).where(eq(schema.jobs.id, jobId)).get();
    expect(job).toBeDefined();
    expect(job?.error).toBe("Original error");
  });
});