import { EventEmitter } from "node:events";
import assert from "node:assert/strict";
import { describe, it } from "vitest";

import {
  buildMigrateStatusCommand,
  formatMigrateStatusResult,
  redactSecrets,
  verifyDbMigrateStatus,
} from "./verify-db-migrate-status.mjs";

function createSpawnStub({ exitCode = 0, stdout = "", stderr = "", error = null } = {}) {
  const calls = [];
  const spawnImpl = (command, args, options) => {
    calls.push({ command, args, options });

    if (error?.throwSync) {
      throw error.value;
    }

    const child = new EventEmitter();
    child.stdout = new EventEmitter();
    child.stderr = new EventEmitter();

    queueMicrotask(() => {
      if (stdout) {
        child.stdout.emit("data", Buffer.from(stdout));
      }
      if (stderr) {
        child.stderr.emit("data", Buffer.from(stderr));
      }
      if (error) {
        child.emit("error", error.value ?? error);
      } else {
        child.emit("close", exitCode);
      }
    });

    return child;
  };

  return { spawnImpl, calls };
}

const SECRET_URL = "postgresql://ci_user:super-secret@db.example.test:5432/toolctrl";

describe("verify-db-migrate-status", () => {
  it("constructs the package-owned Prisma migrate status command", () => {
    const command = buildMigrateStatusCommand();

    assert.equal(command.command, "pnpm");
    assert.deepEqual(command.args, ["--filter", "@toolctrl/db", "prisma:migrate:status"]);
    assert.equal(command.display, "pnpm --filter @toolctrl/db prisma:migrate:status");
  });

  it("passes when Prisma migrate status exits successfully", async () => {
    const { spawnImpl, calls } = createSpawnStub({ stdout: "Database schema is up to date\n", exitCode: 0 });

    const result = await verifyDbMigrateStatus({
      env: { DATABASE_URL: SECRET_URL, PATH: "/bin" },
      spawnImpl,
      cwd: "/repo",
    });
    const output = formatMigrateStatusResult(result);

    assert.equal(result.ok, true);
    assert.equal(result.phase, "prisma:migrate:status");
    assert.equal(result.exitCode, 0);
    assert.equal(calls.length, 1);
    assert.equal(calls[0].command, "pnpm");
    assert.deepEqual(calls[0].args, ["--filter", "@toolctrl/db", "prisma:migrate:status"]);
    assert.equal(calls[0].options.cwd, "/repo");
    assert.equal(calls[0].options.env.CI, "1");
    assert.equal(calls[0].options.env.DATABASE_URL, SECRET_URL);
    assert.match(output, /^PASS database migrate status verification/);
    assert.match(output, /phase: prisma:migrate:status/);
    assert.match(output, /command: pnpm --filter @toolctrl\/db prisma:migrate:status/);
    assert.match(output, /exitCode: 0/);
  });

  it("fails before spawning when DATABASE_URL is missing", async () => {
    const { spawnImpl, calls } = createSpawnStub();

    const result = await verifyDbMigrateStatus({ env: { PATH: "/bin" }, spawnImpl });
    const output = formatMigrateStatusResult(result);

    assert.equal(result.ok, false);
    assert.equal(result.phase, "preflight");
    assert.equal(calls.length, 0);
    assert.match(output, /^FAIL database migrate status verification/);
    assert.match(output, /status: missing DATABASE_URL/);
    assert.match(output, /DATABASE_URL is required/);
  });

  it("fails with sanitized output when Prisma migrate status exits non-zero", async () => {
    const { spawnImpl } = createSpawnStub({
      exitCode: 1,
      stdout: `Connecting with DATABASE_URL=${SECRET_URL}\n`,
      stderr: `Migration failed for ${SECRET_URL}\n`,
    });

    const result = await verifyDbMigrateStatus({ env: { DATABASE_URL: SECRET_URL }, spawnImpl });
    const output = formatMigrateStatusResult(result);

    assert.equal(result.ok, false);
    assert.equal(result.exitCode, 1);
    assert.equal(result.status, "prisma migrate status failed");
    assert.match(output, /^FAIL database migrate status verification/);
    assert.match(output, /exitCode: 1/);
    assert.doesNotMatch(output, /super-secret/);
    assert.doesNotMatch(output, new RegExp(SECRET_URL.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")));
    assert.match(output, /<redacted:DATABASE_URL>/);
  });

  it("passes unreachable database failures only when explicitly allowed", async () => {
    const { spawnImpl } = createSpawnStub({
      exitCode: 1,
      stderr: "Error: P1001: Can't reach database server at `db.internal:5432`\n",
    });

    const result = await verifyDbMigrateStatus({
      env: {
        DATABASE_URL: SECRET_URL,
        DB_MIGRATE_STATUS_ALLOW_UNREACHABLE: "1",
      },
      spawnImpl,
    });
    const output = formatMigrateStatusResult(result);

    assert.equal(result.ok, true);
    assert.equal(result.exitCode, 1);
    assert.equal(result.status, "database unreachable; skipped by DB_MIGRATE_STATUS_ALLOW_UNREACHABLE");
    assert.match(output, /^PASS database migrate status verification/);
  });

  it("still fails unreachable database errors without the explicit allow flag", async () => {
    const { spawnImpl } = createSpawnStub({
      exitCode: 1,
      stderr: "Error: P1001: Can't reach database server at `db.internal:5432`\n",
    });

    const result = await verifyDbMigrateStatus({ env: { DATABASE_URL: SECRET_URL }, spawnImpl });

    assert.equal(result.ok, false);
    assert.equal(result.status, "prisma migrate status failed");
  });

  it("fails with spawn diagnostics when command execution errors", async () => {
    const { spawnImpl } = createSpawnStub({ error: { value: new Error(`spawn failed for ${SECRET_URL}`) } });

    const result = await verifyDbMigrateStatus({ env: { DATABASE_URL: SECRET_URL }, spawnImpl });
    const output = formatMigrateStatusResult(result);

    assert.equal(result.ok, false);
    assert.equal(result.phase, "spawn");
    assert.equal(result.exitCode, null);
    assert.match(output, /status: spawn error/);
    assert.match(output, /error: spawn failed for <redacted:DATABASE_URL>/);
    assert.doesNotMatch(output, /super-secret/);
  });

  it("redacts literal DATABASE_URL values and generic URL credentials", () => {
    const output = redactSecrets(
      `DATABASE_URL=${SECRET_URL}\njson={"DATABASE_URL":"${SECRET_URL}"}\nother=mysql://user:password@localhost:3306/app`,
      { DATABASE_URL: SECRET_URL },
    );

    assert.doesNotMatch(output, /super-secret/);
    assert.doesNotMatch(output, /password/);
    assert.doesNotMatch(output, /ci_user/);
    assert.match(output, /DATABASE_URL=<redacted:DATABASE_URL>/);
    assert.match(output, /mysql:\/\/<redacted>@localhost/);
  });

  it("captures synchronous spawn failures as sanitized failures", async () => {
    const { spawnImpl } = createSpawnStub({ error: { throwSync: true, value: new Error(`ENOENT ${SECRET_URL}`) } });

    const result = await verifyDbMigrateStatus({ env: { DATABASE_URL: SECRET_URL }, spawnImpl });
    const output = formatMigrateStatusResult(result);

    assert.equal(result.ok, false);
    assert.equal(result.phase, "spawn");
    assert.match(output, /ENOENT <redacted:DATABASE_URL>/);
    assert.doesNotMatch(output, /super-secret/);
  });
});