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

import { afterAll, beforeAll, describe, expect, it } from "vitest";
import type {
  Map as MissionMap,
  Mission,
  MissionRoleSignup,
  Qualification,
  Rank,
  User,
} from "@/payload-types";
import {
  diffPromotedUsers,
  getMissionRoleSignupState,
  getSlotHolders,
  removeRoleSignup,
  roleSignupGate,
  roleSignupsClosedMessage,
  signupForRole,
  withdrawRoleSignup,
} from "@/lib/intelligence/roleSignups";
import { setMissionAttendance } from "@/lib/attendance";

let payload: Payload;

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

/**
 * User deletion trips FK constraints unless the hook-provisioned personal bank
 * account and profile are removed first, and event/notification rows must go
 * before the users they reference.
 */
const deleteUserWithRelations = async (pg: Payload, id: number): Promise<void> => {
  const accounts = await pg
    .find({
      collection: "bank-accounts",
      where: { ownerUser: { equals: id } },
      limit: 5,
      depth: 0,
      overrideAccess: true,
    })
    .catch(() => null);
  for (const account of accounts?.docs ?? []) {
    await pg
      .delete({ collection: "bank-accounts", id: account.id, overrideAccess: true })
      .catch(() => {});
  }
  const profiles = await pg
    .find({
      collection: "profiles",
      where: { user: { equals: id } },
      limit: 5,
      depth: 0,
      overrideAccess: true,
    })
    .catch(() => null);
  for (const profile of profiles?.docs ?? []) {
    await pg
      .delete({ collection: "profiles", id: profile.id, overrideAccess: true })
      .catch(() => {});
  }
  await pg.delete({ collection: "users", id, overrideAccess: true }).catch(() => {});
};

const deleteMissionWithRelations = async (pg: Payload, missionId: number): Promise<void> => {
  for (const collection of ["mission-role-signups", "mission-attendances"] as const) {
    const docs = await pg
      .find({
        collection,
        where: { mission: { equals: missionId } },
        limit: 500,
        depth: 0,
        overrideAccess: true,
      })
      .catch(() => null);
    for (const doc of docs?.docs ?? []) {
      await pg.delete({ collection, id: doc.id, overrideAccess: true }).catch(() => {});
    }
  }
  await pg.delete({ collection: "missions", id: missionId, overrideAccess: true }).catch(() => {});
};

describe("Mission role sign-ups", () => {
  let mapId: number;
  let missionId: number;
  let queueMissionId: number;
  let switchMissionId: number;
  let bypassMissionId: number;
  let pastMissionId: number;
  let cancelledMissionId: number;
  const missionIds: number[] = [];
  const rankIds: number[] = [];
  const qualIds: number[] = [];
  const userIds: number[] = [];

  let pvt: Rank;
  let cpl: Rank;
  let sgt: Rank;
  let medic: Qualification;

  let memberA: User; // Pvt with the Medic MOS
  let memberB: User; // Pvt with no qualifications
  let memberC: User; // Cpl, no qualifications
  let memberD: User; // Sgt with the Medic MOS
  let adminUser: User;

  const makeMission = async (
    label: string,
    options: {
      status?: Mission["ownershipAndStatus"]["status"];
      start?: Date;
      roles: Record<string, unknown>[];
    },
  ): Promise<Mission> => {
    const providedRoles = options.roles as NonNullable<Mission["missionRoles"]>["providedRoles"];
    const mission = (await payload.create({
      collection: "missions",
      data: {
        name: `${RUN} ${label}`,
        codeName: `${RUN}-${label}`,
        summary: "Role sign-up test mission",
        operationType: "main",
        classification: {
          map: mapId,
          missionType: "PvE",
          startDateTime: (
            options.start ?? new Date(Date.now() + 2 * 24 * 60 * 60 * 1000)
          ).toISOString(),
          estimatedDuration: 60,
        },
        ownershipAndStatus: {
          authors: [adminUser.id],
          status: options.status ?? "Scheduled",
          visibility: "unit",
        },
        briefing: [],
        gameDetails: {
          serverDetails: {
            serverIp: "127.0.0.1",
            serverPort: 2302,
          },
        },
        missionRoles: {
          maxPlayers: 32,
          providedRoles,
        },
      },
      overrideAccess: true,
      depth: 0,
    })) as unknown as Mission;
    missionIds.push(mission.id);
    return mission;
  };

  const makeUser = async (username: string, roles: User["roles"] = ["user"]): Promise<User> => {
    const user = (await payload.create({
      collection: "users",
      data: {
        username,
        discordUsername: username,
        displayName: "ROLE SIGNUP TEST",
        steamId: `7656119${Math.floor(Math.random() * 1e9)}`,
        password: "Test123",
        roles,
      },
      overrideAccess: true,
      depth: 0,
    })) as unknown as User;
    userIds.push(user.id);
    return user;
  };

  const setProfile = async (userId: number, rankId: number, qualificationIds: number[]) => {
    const profiles = (await payload.find({
      collection: "profiles",
      where: { user: { equals: userId } },
      limit: 1,
      depth: 0,
      overrideAccess: true,
    })) as unknown as { docs: Array<{ id: number }> };
    await payload.update({
      collection: "profiles",
      id: profiles.docs[0].id,
      data: { rank: rankId, progression: { qualifications: qualificationIds } },
      overrideAccess: true,
      depth: 0,
    });
  };

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

    const map = (await payload.create({
      collection: "maps",
      data: {
        name: `${RUN} Map`,
        worldSizeWidth: 8192,
        worldSizeHeight: 8192,
        basemapMode: "image",
      },
      overrideAccess: true,
      depth: 0,
    })) as unknown as MissionMap;
    mapId = map.id;

    // Self-contained 3-rank ladder: Pvt < Cpl < Sgt.
    for (const [name, abbreviation] of [
      ["Pvt", "pvt"],
      ["Cpl", "cpl"],
      ["Sgt", "sgt"],
    ] as const) {
      const rank = (await payload.create({
        collection: "ranks",
        data: {
          name: `${RUN} ${name}`,
          abbreviation: `${RUN}-${abbreviation}`,
          description: `${RUN} test rank`,
        },
        overrideAccess: true,
        depth: 0,
      })) as unknown as Rank;
      rankIds.push(rank.id);
      if (name === "Pvt") pvt = rank;
      if (name === "Cpl") cpl = rank;
      if (name === "Sgt") sgt = rank;
    }

    medic = (await payload.create({
      collection: "qualifications",
      data: { name: `${RUN} Advanced Medic` },
      overrideAccess: true,
      depth: 0,
    })) as unknown as Qualification;
    qualIds.push(medic.id);

    adminUser = await makeUser(`${RUN}-admin`, ["admin"]);
    memberA = await makeUser(`${RUN}-a`);
    memberB = await makeUser(`${RUN}-b`);
    memberC = await makeUser(`${RUN}-c`);
    memberD = await makeUser(`${RUN}-d`);

    await setProfile(memberA.id, pvt.id, [medic.id]);
    await setProfile(memberB.id, pvt.id, []);
    await setProfile(memberC.id, cpl.id, []);
    await setProfile(memberD.id, sgt.id, [medic.id]);

    const main = await makeMission("Main", {
      roles: [
        { roleName: "Squad Leader", slots: 1, minimumRank: cpl.id },
        { roleName: "Medic", slots: 1, requiredMos: [medic.id] },
        { roleName: "Rifleman", slots: 2 },
      ],
    });
    missionId = main.id;

    const queue = await makeMission("Queue", {
      roles: [{ roleName: "Rifleman", slots: 2 }],
    });
    queueMissionId = queue.id;

    const switchMission = await makeMission("Switch", {
      roles: [
        { roleName: "Medic", slots: 1, requiredMos: [medic.id] },
        { roleName: "Rifleman", slots: 2 },
      ],
    });
    switchMissionId = switchMission.id;

    const bypass = await makeMission("Bypass", {
      roles: [{ roleName: "Squad Leader", slots: 1, minimumRank: sgt.id }],
    });
    bypassMissionId = bypass.id;

    const past = await makeMission("Past", {
      start: new Date(Date.now() - 24 * 60 * 60 * 1000),
      roles: [{ roleName: "Rifleman", slots: 2 }],
    });
    pastMissionId = past.id;

    const cancelled = await makeMission("Cancelled", {
      status: "Cancelled",
      roles: [{ roleName: "Rifleman", slots: 2 }],
    });
    cancelledMissionId = cancelled.id;
  });

  afterAll(async () => {
    for (const id of missionIds) {
      await deleteMissionWithRelations(payload, id);
    }
    // Events and notifications reference users; remove them before the users.
    for (const collection of ["game-event-logs", "user-notifications"] as const) {
      const docs = await payload
        .find({
          collection,
          where: { id: { exists: true } },
          limit: 500,
          depth: 0,
          overrideAccess: true,
        })
        .catch(() => null);
      for (const doc of docs?.docs ?? []) {
        const event = doc as unknown as {
          actor?: number | { id: number } | null;
          user?: number | { id: number } | null;
        };
        const ref = event.actor ?? event.user;
        const refId = typeof ref === "object" ? ref?.id : ref;
        if (refId != null && userIds.includes(refId)) {
          await payload.delete({ collection, id: doc.id, overrideAccess: true }).catch(() => {});
        }
      }
    }
    for (const id of userIds) {
      await deleteUserWithRelations(payload, id);
    }
    for (const id of qualIds) {
      await payload
        .delete({ collection: "qualifications", id, overrideAccess: true })
        .catch(() => {});
    }
    for (const id of rankIds) {
      await payload.delete({ collection: "ranks", id, overrideAccess: true }).catch(() => {});
    }
    await payload.delete({ collection: "maps", id: mapId, overrideAccess: true }).catch(() => {});
  });

  it("gates sign-ups by minimum rank and required MOS", async () => {
    // B is a Pvt: the Squad Leader role requires Cpl or higher.
    await expect(
      signupForRole(payload, { missionId, userId: memberB.id, roleIndex: 0 }),
    ).rejects.toThrow(/Requires the rank of/);

    // C is a Cpl: passes the rank gate and immediately holds the slot once RSVPed.
    await setMissionAttendance(payload, { missionId, userId: memberC.id, response: "yes" });
    await signupForRole(payload, { missionId, userId: memberC.id, roleIndex: 0 });
    const afterC = await getMissionRoleSignupState(payload, missionId);
    expect(afterC.roles[0].filled).toBe(1);
    expect(afterC.roles[0].entries[0].holding).toBe(true);

    // B lacks the Medic MOS.
    await expect(
      signupForRole(payload, { missionId, userId: memberB.id, roleIndex: 1 }),
    ).rejects.toThrow(/Requires qualification:/);

    // A is a Pvt with the Medic MOS: the Medic role has no rank floor.
    await signupForRole(payload, { missionId, userId: memberA.id, roleIndex: 1 });
    const afterA = await getMissionRoleSignupState(payload, missionId);
    expect(afterA.roles[1].filled).toBe(0); // A has not RSVPed yet, so no slot held
    expect(afterA.roles[1].entries[0].holding).toBe(false);

    // Re-signing for the same role is a no-op (one signup per user per mission).
    await signupForRole(payload, { missionId, userId: memberA.id, roleIndex: 1 });
    const signups = await payload.find({
      collection: "mission-role-signups",
      where: { mission: { equals: missionId } },
      limit: 100,
      depth: 0,
      overrideAccess: true,
    });
    expect(signups.docs).toHaveLength(2);

    // A role index past the end of the mission's role list is refused.
    await expect(
      signupForRole(payload, { missionId, userId: memberA.id, roleIndex: 99 }),
    ).rejects.toThrow(/no longer exists/);
  });

  it("queues by first-come-first-served and auto-promotes on RSVP drop", async () => {
    await setMissionAttendance(payload, {
      missionId: queueMissionId,
      userId: memberA.id,
      response: "yes",
    });
    await setMissionAttendance(payload, {
      missionId: queueMissionId,
      userId: memberB.id,
      response: "yes",
    });
    await setMissionAttendance(payload, {
      missionId: queueMissionId,
      userId: memberC.id,
      response: "yes",
    });

    await signupForRole(payload, { missionId: queueMissionId, userId: memberA.id, roleIndex: 0 });
    await signupForRole(payload, { missionId: queueMissionId, userId: memberB.id, roleIndex: 0 });
    await signupForRole(payload, { missionId: queueMissionId, userId: memberC.id, roleIndex: 0 });

    let state = await getMissionRoleSignupState(payload, queueMissionId);
    expect(state.roles[0].filled).toBe(2);
    expect(state.roles[0].entries.map((e) => [e.position, e.holding])).toEqual([
      [1, true],
      [2, true],
      [3, false],
    ]);
    expect(state.roles[0].slots).toBe(2);

    // A (slot holder) RSVPs No: the first waitlisted member takes over.
    await setMissionAttendance(payload, {
      missionId: queueMissionId,
      userId: memberA.id,
      response: "no",
    });

    state = await getMissionRoleSignupState(payload, queueMissionId);
    expect(state.roles[0].filled).toBe(2);
    expect(state.roles[0].entries.map((e) => [e.holding])).toEqual([[false], [true], [true]]);

    // The promoted member is notified and the promotion is logged.
    const notifications = await payload.find({
      collection: "user-notifications",
      where: { user: { equals: memberC.id } },
      limit: 100,
      depth: 0,
      overrideAccess: true,
    });
    const promotedNotes = notifications.docs.filter(
      (n) => (n as unknown as { type: string }).type === "mission:role-promoted",
    );
    expect(promotedNotes).toHaveLength(1);
    expect(promotedNotes[0]).toMatchObject({
      title: "Slot granted: Rifleman",
      link: `/intelligence/missions/${queueMissionId}`,
    });

    const events = await payload.find({
      collection: "game-event-logs",
      where: { type: { equals: "mission:role-promoted" } },
      limit: 100,
      depth: 0,
      overrideAccess: true,
    });
    const promotionEvent = events.docs.find(
      (e) =>
        (e as unknown as { targetId: number }).targetId === queueMissionId &&
        JSON.stringify((e as unknown as { data?: { userId?: number } }).data ?? {}).includes(
          `"userId":${memberC.id}`,
        ),
    );
    expect(promotionEvent).toBeDefined();
  });

  it("promotes on withdrawal and refuses a second withdrawal", async () => {
    // D joins the (full) Rifleman queue: two holders, two waitlisted.
    await setMissionAttendance(payload, {
      missionId: queueMissionId,
      userId: memberD.id,
      response: "yes",
    });
    await signupForRole(payload, { missionId: queueMissionId, userId: memberD.id, roleIndex: 0 });

    let state = await getMissionRoleSignupState(payload, queueMissionId);
    expect(state.roles[0].entries).toHaveLength(4);

    // B withdraws: C keeps a slot and D (next committed member) takes B's.
    await withdrawRoleSignup(payload, { missionId: queueMissionId, userId: memberB.id });

    state = await getMissionRoleSignupState(payload, queueMissionId);
    expect(state.roles[0].filled).toBe(2);
    expect(state.roles[0].entries.find((e) => e.userId === memberD.id)?.holding).toBe(true);
    expect(state.roles[0].entries.find((e) => e.userId === memberB.id)).toBeUndefined();

    await expect(
      withdrawRoleSignup(payload, { missionId: queueMissionId, userId: memberB.id }),
    ).rejects.toThrow(/not signed up/);
  });

  it("moves the signup when switching roles and enforces requirements on the target", async () => {
    // A holds a Rifleman slot on the switch mission, then moves to Medic.
    await setMissionAttendance(payload, {
      missionId: switchMissionId,
      userId: memberA.id,
      response: "yes",
    });
    await signupForRole(payload, { missionId: switchMissionId, userId: memberA.id, roleIndex: 1 });
    let state = await getMissionRoleSignupState(payload, switchMissionId, memberA.id);
    expect(state.roles[1].filled).toBe(1);
    expect(state.mySignup).toMatchObject({ roleIndex: 1, holding: true });

    // Switching to Medic moves the one live signup (no second row).
    await signupForRole(payload, { missionId: switchMissionId, userId: memberA.id, roleIndex: 0 });
    state = await getMissionRoleSignupState(payload, switchMissionId, memberA.id);
    expect(state.roles[1].entries).toHaveLength(0);
    expect(state.roles[0].filled).toBe(1);
    expect(state.mySignup).toMatchObject({ roleIndex: 0, holding: true });

    // B (Pvt, no MOS) and C (Cpl, no MOS) both fail the Medic MOS gate.
    await expect(
      signupForRole(payload, { missionId: switchMissionId, userId: memberB.id, roleIndex: 0 }),
    ).rejects.toThrow(/Requires qualification:/);
    await expect(
      signupForRole(payload, { missionId: switchMissionId, userId: memberC.id, roleIndex: 0 }),
    ).rejects.toThrow(/Requires qualification:/);
  });

  it("lets staff bypass eligibility and remove sign-ups", async () => {
    // Admin signs up for the Sgt-floored role despite holding no test rank.
    await setMissionAttendance(payload, {
      missionId: bypassMissionId,
      userId: adminUser.id,
      response: "yes",
    });
    await signupForRole(payload, {
      missionId: bypassMissionId,
      userId: adminUser.id,
      roleIndex: 0,
      bypassEligibility: true,
    });
    const state = await getMissionRoleSignupState(payload, bypassMissionId, adminUser.id);
    expect(state.roles[0].filled).toBe(1);
    expect(state.mySignup).toMatchObject({ roleIndex: 0, holding: true });

    // Staff removal reconciles slots and is marked in the event log.
    const signupId = state.roles[0].entries[0].signupId;
    await removeRoleSignup(payload, {
      missionId: bypassMissionId,
      signupId,
      actorId: adminUser.id,
    });
    const after = await getMissionRoleSignupState(payload, bypassMissionId, adminUser.id);
    expect(after.roles[0].entries).toHaveLength(0);
    expect(after.mySignup).toBeNull();

    const withdrawEvents = await payload.find({
      collection: "game-event-logs",
      where: { type: { equals: "mission:role-withdraw" } },
      limit: 100,
      depth: 0,
      overrideAccess: true,
    });
    const removal = withdrawEvents.docs.find(
      (e) =>
        (e as unknown as { targetId: number }).targetId === bypassMissionId &&
        (e as unknown as { data?: { removedByStaff?: boolean } }).data?.removedByStaff === true,
    );
    expect(removal).toBeDefined();
  });

  it("closes sign-ups for past and cancelled missions", async () => {
    const pastGate = roleSignupGate({
      ownershipAndStatus: { status: "Scheduled" },
      classification: { startDateTime: new Date(Date.now() - 60_000).toISOString() },
    });
    expect(pastGate.open).toBe(false);
    expect(pastGate.reason).toBe(roleSignupsClosedMessage);

    await expect(
      signupForRole(payload, { missionId: pastMissionId, userId: memberA.id, roleIndex: 0 }),
    ).rejects.toThrow(roleSignupsClosedMessage);

    const cancelledGate = roleSignupGate({
      ownershipAndStatus: { status: "Cancelled" },
      classification: { startDateTime: new Date(Date.now() + 60_000).toISOString() },
    });
    expect(cancelledGate.open).toBe(false);
    expect(cancelledGate.reason).toBe("This operation was cancelled.");

    await expect(
      signupForRole(payload, { missionId: cancelledMissionId, userId: memberA.id, roleIndex: 0 }),
    ).rejects.toThrow("This operation was cancelled.");
  });

  it("derives slot holders as a userId -> roleIndex map and diffs promotions", async () => {
    const holders = await getSlotHolders(payload, missionId);
    // C holds Squad Leader (RSVPed yes). A RSVPed no on the main mission, so no
    // Medic slot is held there.
    expect(holders.get(memberC.id)).toBe(0);
    expect(holders.has(memberA.id)).toBe(false);

    // A RSVPs yes: they now hold the Medic slot.
    await setMissionAttendance(payload, { missionId, userId: memberA.id, response: "yes" });
    const holdersAfter = await getSlotHolders(payload, missionId);
    expect(holdersAfter.get(memberA.id)).toBe(1);

    const promoted = diffPromotedUsers(holders, holdersAfter);
    expect(promoted).toEqual([{ userId: memberA.id, roleIndex: 1 }]);
  });
});