import { getPayload, Payload } from "payload";
import config from "@/payload.config";

import { afterAll, beforeAll, describe, expect, it } from "vitest";
import type { Award, Profile, User } from "@/payload-types";
import { AwardGrantEntry, diffGrantedAwards } from "@/lib/awards";

let payload: Payload;

const RUN = `aw-${Date.now().toString(36)}`;

function richText(text: string) {
  return {
    root: {
      type: "root",
      format: "" as const,
      indent: 0,
      version: 1,
      children: [
        {
          type: "paragraph",
          format: "" as const,
          indent: 0,
          version: 1,
          children: [
            { type: "text", format: 0, style: "", mode: "normal" as const, text, version: 1 },
          ],
          direction: "ltr" as const,
        },
      ],
      direction: "ltr" as const,
    },
  };
}

describe("Award grant notifications", () => {
  let user: User;
  let profileId: number;
  let medalId: number;
  let ribbonId: number;

  const countGrantNotifications = async (userId: number) => {
    const res = await payload.find({
      collection: "user-notifications",
      where: { user: { equals: userId }, type: { equals: "award:granted" } },
      limit: 50,
      overrideAccess: true,
      depth: 0,
    });
    return res.docs as Array<{
      id: number;
      title?: string | null;
      message?: string | null;
      link?: string | null;
    }>;
  };

  const setAwards = async (awards: AwardGrantEntry[]) => {
    await payload.update({
      collection: "profiles",
      id: profileId,
      data: { progression: { awards } },
      overrideAccess: true,
      depth: 0,
    });
  };

  beforeAll(async () => {
    const payloadConfig = await config;
    payload = await getPayload({ config: payloadConfig });

    const makeAward = async (name: string, type: "medal" | "ribbon"): Promise<number> => {
      const created = (await payload.create({
        collection: "awards",
        data: {
          name,
          description: richText(`${RUN} test award`),
          type,
        },
        overrideAccess: true,
        depth: 0,
      })) as unknown as Award;
      return created.id;
    };

    medalId = await makeAward(`${RUN} Test Medal`, "medal");
    ribbonId = await makeAward(`${RUN} Test Ribbon`, "ribbon");

    user = (await payload.create({
      collection: "users",
      data: {
        username: `${RUN}-operator`,
        discordUsername: `${RUN}-operator-discord`,
        displayName: `${RUN} Operator`,
        steamId: `7656119${Math.floor(Math.random() * 1e9)}`,
        password: "Test123",
      },
      overrideAccess: true,
      depth: 0,
    })) as unknown as User;

    // The Users afterChange hook auto-creates a profile for new users.
    const profiles = await payload.find({
      collection: "profiles",
      where: { user: { equals: user.id } },
      limit: 1,
      depth: 0,
      overrideAccess: true,
    });
    if (profiles.docs.length === 0) throw new Error("Test setup failed: profile was not auto-created.");
    profileId = profiles.docs[0].id;
  });

  afterAll(async () => {
    await payload.delete({ collection: "profiles", id: profileId, overrideAccess: true }).catch(() => {});
    await payload.delete({ collection: "users", id: user.id, overrideAccess: true }).catch(() => {});
    await payload.delete({ collection: "awards", id: medalId, overrideAccess: true }).catch(() => {});
    await payload.delete({ collection: "awards", id: ribbonId, overrideAccess: true }).catch(() => {});
  });

  it("notifies the user when an award is granted", async () => {
    await setAwards([{ award: medalId, awardedAt: new Date().toISOString() }]);
    const docs = await countGrantNotifications(user.id);
    expect(docs).toHaveLength(1);
    expect(docs[0].title).toBe(`Award received: ${RUN} Test Medal`);
    expect(docs[0].link).toBe(`/profile/${user.username}`);
  });

  it("does not notify when an existing entry is edited", async () => {
    const current = await payload.findByID({
      collection: "profiles",
      id: profileId,
      depth: 0,
      overrideAccess: true,
    });
    const entries = (current as unknown as Profile).progression?.awards ?? [];
    expect(entries).toHaveLength(1);
    await setAwards([{ ...entries[0], awardReason: "For exceptional service." }]);
    expect(await countGrantNotifications(user.id)).toHaveLength(1);
  });

  it("does not notify when an award is revoked", async () => {
    await setAwards([]);
    expect(await countGrantNotifications(user.id)).toHaveLength(1);
  });

  it("notifies again when a revoked award is re-granted", async () => {
    await setAwards([
      { award: medalId, awardedAt: new Date().toISOString(), awardReason: "For exceptional service." },
    ]);
    expect(await countGrantNotifications(user.id)).toHaveLength(2);
  });

  it("notifies once per newly granted award in a single update", async () => {
    const current = await payload.findByID({
      collection: "profiles",
      id: profileId,
      depth: 0,
      overrideAccess: true,
    });
    const existing = (current as unknown as Profile).progression?.awards ?? [];
    await setAwards([
      ...existing,
      { award: ribbonId, awardedAt: new Date().toISOString() },
      { award: medalId, awardedAt: new Date(Date.now() + 60_000).toISOString() },
    ]);
    expect(await countGrantNotifications(user.id)).toHaveLength(4);
  });

  it("includes the reason and unit attribution in the message", async () => {
    const docs = await countGrantNotifications(user.id);
    expect(docs.some((d) => d.message?.includes("For exceptional service."))).toBe(true);
    // No issuer on any of these grants, so they are attributed to the unit.
    expect(docs.every((d) => d.message?.includes("On behalf of the unit."))).toBe(true);
  });
});

describe("diffGrantedAwards (pure)", () => {
  const entry = (over: Partial<{ id?: string; awardId?: number; at?: string }>) => ({
    id: over.id,
    award: over.awardId ?? 1,
    awardedAt: over.at ?? "2026-01-01T00:00:00.000Z",
  });

  it("returns empty when nothing changed", () => {
    const doc = { progression: { awards: [entry({ id: "a" })] } };
    expect(diffGrantedAwards(doc, doc)).toHaveLength(0);
  });

  it("detects new rows by row id", () => {
    const before = { progression: { awards: [entry({ id: "a" })] } };
    const after = { progression: { awards: [entry({ id: "a" }), entry({ id: "b", awardId: 2 })] } };
    expect(diffGrantedAwards(before, after).map((e) => e.id)).toEqual(["b"]);
  });

  it("falls back to award+date identity when rows have no id", () => {
    const before = { progression: { awards: [entry({ awardId: 1 })] } };
    // Same award + date, still no ids → not a new grant (reason-only edits keep the date).
    const after = { progression: { awards: [entry({ awardId: 1 })] } };
    expect(diffGrantedAwards(before, after)).toHaveLength(0);
    // New issue date → new grant.
    const regranted = { progression: { awards: [entry({ awardId: 1, at: "2026-02-01T00:00:00.000Z" })] } };
    expect(diffGrantedAwards(before, regranted)).toHaveLength(1);
  });

  it("handles the same award granted twice (multiset)", () => {
    const before = {
      progression: { awards: [entry({ id: "a", awardId: 1 }), entry({ id: "b", awardId: 1 })] },
    };
    const after = {
      progression: {
        awards: [
          entry({ id: "a", awardId: 1 }),
          entry({ id: "b", awardId: 1 }),
          entry({ id: "c", awardId: 1 }),
        ],
      },
    };
    expect(diffGrantedAwards(before, after).map((e) => e.id)).toEqual(["c"]);
  });

  it("treats a created profile with awards as grants", () => {
    const after = { progression: { awards: [entry({ id: "a" })] } };
    expect(diffGrantedAwards(null, after)).toHaveLength(1);
  });
});