import { readFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { getTableConfig } from "drizzle-orm/pg-core";
import { describe, expect, it } from "vitest";
import { ekklesiaCoreDevicePairingRequest } from "../src/devices/index.js";

/**
 * A pairing request may name no module (ADR 0065): a screen on the platform's `/display/setup`
 * pairs as a platform display, and a module is chosen for it, if at all, when it is approved.
 */
const migrationsDirectory = path.join(
  path.dirname(path.dirname(fileURLToPath(import.meta.url))),
  "drizzle",
);

describe("platform display pairing requests", () => {
  it("lets a request name no module, but never a module without its permission", () => {
    const config = getTableConfig(ekklesiaCoreDevicePairingRequest);
    for (const name of ["module_id", "permission_id"]) {
      expect(config.columns.find((column) => column.name === name)?.notNull, name).toBe(false);
    }
    expect(config.checks.map((check) => check.name)).toContain(
      "ekklesia_core_device_pairing_module_check",
    );
  });

  it("is migrated by relaxing two columns and adding the both-or-neither check, nothing else", async () => {
    const sql = await readFile(
      path.join(migrationsDirectory, "0009_platform_display_pairing.sql"),
      "utf8",
    );
    const statements = sql
      .split("--> statement-breakpoint")
      .map((statement) => statement.trim())
      .filter((statement) => statement.length > 0);
    expect(statements).toEqual([
      'ALTER TABLE "ekklesia_core_device_pairing_request" ALTER COLUMN "module_id" DROP NOT NULL;',
      'ALTER TABLE "ekklesia_core_device_pairing_request" ALTER COLUMN "permission_id" DROP NOT NULL;',
      'ALTER TABLE "ekklesia_core_device_pairing_request" ADD CONSTRAINT "ekklesia_core_device_pairing_module_check" CHECK (("ekklesia_core_device_pairing_request"."module_id" is null) = ("ekklesia_core_device_pairing_request"."permission_id" is null));',
    ]);
    // Existing requests, which all name a module, satisfy the new check unchanged.
  });

  it("is a migration that destroys nothing", async () => {
    const metadata = JSON.parse(
      await readFile(path.join(migrationsDirectory, "meta", "_ekklesia.json"), "utf8"),
    ) as { entries: { tag: string; destructive: { mode: string } }[] };
    expect(metadata.entries.find((entry) => entry.tag === "0009_platform_display_pairing")).toEqual(
      { destructive: { mode: "none" }, tag: "0009_platform_display_pairing" },
    );
  });
});