"use server";

import config from "@payload-config";
import { getPayload } from "payload";
import type { AttendanceResponse } from "@/lib/attendance";
import { setMissionAttendance as setAttendance } from "@/lib/attendance";
import { notifyAttendanceChanged } from "@/lib/attendance/realtime";
import { isAdminOrDeveloper } from "@/lib/promotions/authority";
import {
  removeRoleSignup,
  signupForRole,
  withdrawRoleSignup,
} from "@/lib/intelligence/roleSignups";
import { hasPermission } from "@/utils/access-control/hasPermission";
import { isPayloadUser } from "@/utils/access-control/isPayloadUser";
import { emitGameEvent } from "@/utils/event-log/emit";
import { EventTypes } from "@/utils/event-log/eventTypes";
import {
  nextDayKey,
  parseDateKey,
  wallTimeToInstant,
  zonedDateKey,
  zonedParts,
  zonedWeekday,
} from "@/lib/intelligence/fridayTime";
import type { Mission, User } from "@/payload-types";

export interface ActionResult<T = undefined> {
  success: boolean;
  error?: string;
  data?: T;
}

async function authenticate() {
  const payloadConfig = await config;
  const payload = await getPayload({ config: payloadConfig });
  const { headers } = await import("next/headers");
  const hdrs = await headers();
  const { user } = await payload.auth({ headers: hdrs, canSetHeaders: false });

  if (!user || !isPayloadUser(user)) {
    throw new Error("Unauthorized");
  }

  return { payload, user };
}

export async function setMissionAttendance(input: {
  missionId: number;
  response: AttendanceResponse;
}): Promise<ActionResult> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    await setAttendance(payload, {
      missionId: input.missionId,
      userId,
      response: input.response,
    });
    // The bot also polls as a recovery path, but this makes web RSVP changes
    // visible in Discord immediately when the bot is running.
    void notifyAttendanceChanged(payload, input.missionId).catch((error) => {
      payload.logger.warn(
        `Attendance changed, but Discord realtime notification failed: ${
          error instanceof Error ? error.message : "Unknown error"
        }`,
      );
    });

    return { success: true };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

const MISSION_TYPES = ["Zeus", "PvE", "PvP", "PvPvE", "Training", "Special"] as const;

// Not exported: "use server" files may only export async functions.
const MAX_SCHEDULED_AHEAD_MISSIONS = 2;

function isFridayDate(value: string): boolean {
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) {
    return false;
  }
  return zonedWeekday(date) === 5;
}

// Side ops always start 20:00 America/New_York on the validated Friday,
// regardless of the server's own timezone (prod runs UTC).
function fridayStartDateTime(value: string): string {
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) {
    return date.toISOString();
  }
  const p = zonedParts(date);
  return wallTimeToInstant(p.year, p.month, p.day, 20, 0).toISOString();
}

type SideOpMissionUser = {
  id: number;
  username: string;
  displayName?: string | null;
};

async function resolveSideOpCampaign(
  payload: Awaited<ReturnType<typeof getPayload>>,
  user: SideOpMissionUser,
  campaignId?: number | null,
  newCampaignName?: string | null,
): Promise<{ campaignId: number; created: boolean }> {
  if (campaignId) {
    const campaign = await payload.findByID({
      collection: "campaigns",
      id: campaignId,
      depth: 0,
    });
    const ownerId = typeof campaign.owner === "object" ? campaign.owner?.id : campaign.owner;
    if (ownerId !== user.id) {
      throw new Error("You can only schedule missions into campaigns you own.");
    }
    return { campaignId: campaign.id, created: false };
  }

  const name =
    newCampaignName?.trim() || `${user.displayName || user.username}'s Side Ops`;

  const existing = await payload.find({
    collection: "campaigns",
    where: { and: [{ name: { equals: name } }, { owner: { equals: user.id } }] },
    limit: 1,
    depth: 0,
  });
  if (existing.docs.length > 0) {
    return { campaignId: existing.docs[0].id, created: false };
  }

  const campaign = await payload.create({
    collection: "campaigns",
    overrideAccess: true,
    data: {
      name,
      summary: "Player-organized Friday side operations.",
      status: "concept",
      campaignMode: "custom",
      owner: user.id,
      startDate: new Date().toISOString().slice(0, 10),
    },
  });
  return { campaignId: campaign.id, created: true };
}

async function countUpcomingPlayerMissions(
  payload: Awaited<ReturnType<typeof getPayload>>,
  userId: number,
  excludeMissionId?: number,
): Promise<number> {
  const result = await payload.count({
    collection: "missions",
    where: {
      and: [
        { createdBy: { equals: userId } },
        { "classification.startDateTime": { greater_than: new Date().toISOString() } },
        { "ownershipAndStatus.status": { not_in: ["Completed", "Cancelled"] } },
        ...(excludeMissionId ? [{ id: { not_equals: excludeMissionId } }] : []),
      ],
    },
  });
  return result.totalDocs;
}

function isSideOpOwner(
  mission: { createdBy?: number | { id: number } | null },
  userId: number,
): boolean {
  const ownerId = typeof mission.createdBy === "object" ? mission.createdBy?.id : mission.createdBy;
  return ownerId === userId;
}

type InfilExfilMethod = "helicopter" | "aircraft" | "paradrop" | "boat" | "car" | "onFoot";

const INFIL_EXFIL_METHODS: readonly InfilExfilMethod[] = [
  "helicopter",
  "aircraft",
  "paradrop",
  "boat",
  "car",
  "onFoot",
];

export async function uploadSideOpModlist(
  formData: FormData,
): Promise<ActionResult<{ modlistId: number; modlistName: string }>> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const file = formData.get("file");
    const name = formData.get("name");
    if (!(file instanceof File) || file.size === 0) {
      return { success: false, error: "Please choose a mod list file." };
    }
    if (typeof name !== "string" || !name.trim()) {
      return { success: false, error: "Please give the mod list a name." };
    }
    if (file.size > 10 * 1024 * 1024) {
      return { success: false, error: "Mod list file must be 10 MB or smaller." };
    }
    // Only HTML mod lists exported from the Arma 3 launcher are supported. Some
    // browsers report an empty file.type, so also accept by extension.
    const isHtml = file.type === "text/html" || /\.html?$/i.test(file.name);
    if (!isHtml) {
      return {
        success: false,
        error: "Mod list must be an HTML file exported from the Arma 3 launcher.",
      };
    }

    const buffer = Buffer.from(await file.arrayBuffer());
    const created = await payload.create({
      collection: "mod-lists",
      overrideAccess: true,
      data: {
        modlistName: name.trim(),
        author: userId,
      },
      file: {
        data: buffer,
        mimetype: file.type || "text/html",
        name: file.name,
        size: file.size,
      },
    });

    return { success: true, data: { modlistId: created.id, modlistName: created.modlistName } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    if (/invalid: file/i.test(message)) {
      return {
        success: false,
        error:
          "That file type is not accepted. Please upload the .html file exported from the Arma 3 launcher, or a .txt mod list.",
      };
    }
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

function missionRef(mission: { name: string; codeName?: string | null }): string {
  return mission.codeName ? `${mission.name} (${mission.codeName})` : mission.name;
}

export interface FridaySideOpInput {
  name: string;
  codeName?: string;
  summary: string;
  coverImageId?: number | null;
  mapId?: number;
  missionType: (typeof MISSION_TYPES)[number];
  startDateTime: string;
  estimatedDuration?: number;
  maxPlayers?: number;
  campaignId?: number | null;
  newCampaignName?: string | null;
  noCampaign?: boolean;
  customMapName?: string | null;
  requiredModsId?: number | null;
  briefing?: { sectionName: string; details?: Record<string, unknown> | null }[] | null;
  missionObjectives?: {
    title: string;
    description?: string | null;
    missionCritical?: boolean | null;
    successOrFailConditions?: string | null;
    redacted?: boolean | null;
  }[] | null;
  civilianPresence?: "None" | "Low" | "Medium" | "High" | null;
  factionsInvolved?: {
    faction: number;
    threatLevel: "ally" | "friendly" | "neutral" | "hostile";
  }[] | null;
  radioPlan?: Record<string, unknown> | null;
  insertion?: InfilExfilMethod[] | null;
  extraction?: InfilExfilMethod[] | null;
  assetsAvailable?: {
    assetType: string;
    assetCount?: string | null;
    doesRespawn?: boolean | null;
    assetCallsign?: string | null;
  }[] | null;
}

type SideOpNarrativeData = {
  briefing?: { sectionName: string; details: MissionLexicalState }[];
  missionObjectives?: FridaySideOpInput["missionObjectives"];
  civilianPresence?: FridaySideOpInput["civilianPresence"];
  factionsInvolved?: FridaySideOpInput["factionsInvolved"];
  commsAndDocs?: { radioPlan?: MissionLexicalState | null };
  logisticsAndSupport?: {
    insertion?: InfilExfilMethod[] | null;
    extraction?: InfilExfilMethod[] | null;
    assetsAvailable?: FridaySideOpInput["assetsAvailable"];
  };
};

type MissionLexicalState = NonNullable<NonNullable<Mission["briefing"]>[number]["details"]>;

type NarrativeDataResult = { success: true; data: SideOpNarrativeData } | { success: false; error: string };

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

function isLexicalValue(value: unknown): value is MissionLexicalState | null | undefined {
  return value === undefined || value === null || (isRecord(value) && isRecord(value.root));
}

const EMPTY_LEXICAL_STATE: MissionLexicalState = {
  root: {
    type: "root",
    children: [],
    direction: null,
    format: "",
    indent: 0,
    version: 1,
  },
};

function normalizeLexicalValue(
  value: Record<string, unknown> | null | undefined,
): MissionLexicalState {
  if (value === null || value === undefined || !isLexicalValue(value)) {
    return EMPTY_LEXICAL_STATE;
  }
  return value;
}

function narrativeData(input: {
  briefing?: FridaySideOpInput["briefing"];
  missionObjectives?: FridaySideOpInput["missionObjectives"];
  civilianPresence?: FridaySideOpInput["civilianPresence"];
  factionsInvolved?: FridaySideOpInput["factionsInvolved"];
  radioPlan?: FridaySideOpInput["radioPlan"];
  insertion?: FridaySideOpInput["insertion"];
  extraction?: FridaySideOpInput["extraction"];
  assetsAvailable?: FridaySideOpInput["assetsAvailable"];
}): NarrativeDataResult {
  const radioPlan = input.radioPlan;
  if (!isLexicalValue(radioPlan)) {
    return { success: false, error: "Invalid radio plan format." };
  }
  if (input.briefing?.some((entry) => !isLexicalValue(entry.details))) {
    return { success: false, error: "Invalid briefing details format." };
  }

  const commsAndDocs: SideOpNarrativeData["commsAndDocs"] = {};
  if (radioPlan !== undefined) {
    commsAndDocs.radioPlan = radioPlan;
  }
  const logisticsAndSupport: SideOpNarrativeData["logisticsAndSupport"] = {};
  if (input.insertion !== undefined) {
    logisticsAndSupport.insertion = input.insertion;
  }
  if (input.extraction !== undefined) {
    logisticsAndSupport.extraction = input.extraction;
  }
  if (input.assetsAvailable !== undefined) {
    logisticsAndSupport.assetsAvailable = input.assetsAvailable;
  }
  return {
    success: true,
    data: {
      ...(input.briefing !== undefined
        ? {
            briefing: (input.briefing ?? []).map((entry) => ({
              sectionName: entry.sectionName,
              details: normalizeLexicalValue(entry.details),
            })),
          }
        : {}),
      ...(input.missionObjectives !== undefined
        ? { missionObjectives: input.missionObjectives }
        : {}),
      ...(input.civilianPresence !== undefined ? { civilianPresence: input.civilianPresence } : {}),
      ...(input.factionsInvolved !== undefined ? { factionsInvolved: input.factionsInvolved } : {}),
      ...(Object.keys(commsAndDocs).length > 0 ? { commsAndDocs } : {}),
      ...(Object.keys(logisticsAndSupport).length > 0 ? { logisticsAndSupport } : {}),
    },
  };
}

async function findActiveMissionOnFriday(
  payload: Awaited<ReturnType<typeof getPayload>>,
  startDateTime: string,
  excludeMissionId?: number,
): Promise<{ id: number; name: string; codeName?: string | null } | null> {
  const start = new Date(fridayStartDateTime(startDateTime));
  const key = zonedDateKey(start);
  const { year, month, day } = parseDateKey(key);
  const next = parseDateKey(nextDayKey(key));
  const dayStart = wallTimeToInstant(year, month, day);
  const dayEnd = wallTimeToInstant(next.year, next.month, next.day);

  const res = await payload.find({
    collection: "missions",
    where: {
      and: [
        { "classification.startDateTime": { greater_than_equal: dayStart.toISOString() } },
        { "classification.startDateTime": { less_than: dayEnd.toISOString() } },
        { "ownershipAndStatus.status": { not_in: ["Completed", "Cancelled"] } },
        ...(excludeMissionId ? [{ id: { not_equals: excludeMissionId } }] : []),
      ],
    },
    depth: 0,
    limit: 1,
    overrideAccess: true,
    select: { name: true, codeName: true },
  });
  return res.docs[0] ?? null;
}

async function resolveSideOpMap(
  payload: Awaited<ReturnType<typeof getPayload>>,
  input: { mapId?: number | null; customMapName?: string | null },
): Promise<number | null> {
  const customName = input.customMapName?.trim();
  if (customName) {
    const exact = await payload.find({
      collection: "maps",
      where: { name: { equals: customName } },
      depth: 0,
      limit: 1,
      overrideAccess: true,
    });
    if (exact.docs.length > 0) return exact.docs[0].id;
    const all = await payload.find({
      collection: "maps",
      depth: 0,
      limit: 500,
      overrideAccess: true,
      sort: "name",
    });
    const existing = all.docs.find(
      (m) => m.name.toLocaleLowerCase() === customName.toLocaleLowerCase(),
    );
    if (existing) return existing.id;
    const created = await payload.create({
      collection: "maps",
      data: {
        name: customName,
        worldSizeWidth: 8192,
        worldSizeHeight: 8192,
        basemapMode: "image",
      },
      overrideAccess: true,
    });
    return created.id;
  }
  return input.mapId ?? null;
}

export async function createFridaySideOp(
  input: FridaySideOpInput,
): Promise<ActionResult<{ missionId: number }>> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    if (!input.name?.trim() || !input.summary?.trim()) {
      return { success: false, error: "Name and summary are required." };
    }
    if (!input.mapId && !input.customMapName?.trim()) {
      return { success: false, error: "Please choose a map." };
    }
    if (!MISSION_TYPES.includes(input.missionType)) {
      return { success: false, error: "Please choose a valid mission type." };
    }
    if (!isFridayDate(input.startDateTime)) {
      return {
        success: false,
        error: "Side operations can only be scheduled on a Friday.",
      };
    }
    const startDate = new Date(input.startDateTime);
    if (Number.isNaN(startDate.getTime())) {
      return { success: false, error: "Invalid start date/time." };
    }
    if (startDate.getTime() <= Date.now()) {
      return { success: false, error: "Side operations must be scheduled in the future." };
    }

    const scheduledAhead = await countUpcomingPlayerMissions(payload, userId);
    if (scheduledAhead >= MAX_SCHEDULED_AHEAD_MISSIONS) {
      return {
        success: false,
        error: `You already have ${MAX_SCHEDULED_AHEAD_MISSIONS} upcoming missions scheduled. Cancel or complete one before scheduling another.`,
      };
    }

    const fridayConflict = await findActiveMissionOnFriday(payload, input.startDateTime);
    if (fridayConflict) {
      return {
        success: false,
          error: `That Friday is already taken by "${missionRef(fridayConflict)}". Only one operation per Friday, first come first served.`,
      };
    }

    const campaignId = input.noCampaign
      ? null
      : (
          await resolveSideOpCampaign(
            payload,
            { id: userId, username: user.username, displayName: user.displayName },
            input.campaignId ?? null,
            input.newCampaignName ?? null,
          )
        ).campaignId;

    const resolvedMapId = await resolveSideOpMap(payload, {
      mapId: input.mapId,
      customMapName: input.customMapName,
    });
    if (resolvedMapId == null) {
      return { success: false, error: "Please choose a map." };
    }

    const narrative = narrativeData(input);
    if (!narrative.success) return narrative;

    const mission = await payload.create({
      collection: "missions",
      overrideAccess: true,
      data: {
        name: input.name.trim(),
        ...(input.codeName?.trim() ? { codeName: input.codeName.trim() } : {}),
        summary: input.summary.trim(),
        operationType: "side",
        ...(input.coverImageId ? { coverImage: input.coverImageId } : {}),
        createdBy: userId,
        ownershipAndStatus: {
          // Side ops are created as a quiet "Ready" draft. The creator commits
          // them to "Scheduled" (markSideOpScheduled) to lock the Friday slot
          // and trigger the roll-call; only then does the mission lifecycle
          // (auto-start -> auto-complete) drive them.
          status: "Ready",
          visibility: "unit",
          authors: [userId],
        },
        classification: {
          map: resolvedMapId,
          missionType: input.missionType,
          campaign: campaignId,
          startDateTime: fridayStartDateTime(input.startDateTime),
          estimatedDuration: input.estimatedDuration ?? 240,
        },
        missionRoles: {
          maxPlayers: input.maxPlayers ?? 32,
        },
        gameDetails: {
          serverDetails: {
            serverIp: "arma.onyxsimple.com",
            serverPort: 2302,
          },
          ...(input.requiredModsId
            ? { gameSetup: { requiredMods: input.requiredModsId } }
            : {}),
        },
        ...narrative.data,
      },
    });

    const startIso = fridayStartDateTime(input.startDateTime);
    await emitGameEvent(payload, {
      type: EventTypes.MissionSchedule,
      message: `${user.displayName || user.username} scheduled side operation "${missionRef(mission)}" for ${new Date(startIso).toLocaleString()}.`,
      actor: userId,
      targetCollection: "missions",
      targetId: mission.id,
      data: { startDateTime: startIso, campaignId },
    });

    return { success: true, data: { missionId: mission.id } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

export interface UpdateFridaySideOpInput {
  missionId: number;
  name?: string;
  codeName?: string;
  summary?: string;
  coverImageId?: number | null;
  mapId?: number;
  missionType?: (typeof MISSION_TYPES)[number];
  startDateTime?: string;
  estimatedDuration?: number;
  maxPlayers?: number;
  campaignId?: number | null;
  newCampaignName?: string | null;
  noCampaign?: boolean;
  customMapName?: string | null;
  requiredModsId?: number | null;
  briefing?: { sectionName: string; details?: Record<string, unknown> | null }[] | null;
  missionObjectives?: FridaySideOpInput["missionObjectives"];
  civilianPresence?: FridaySideOpInput["civilianPresence"];
  factionsInvolved?: FridaySideOpInput["factionsInvolved"];
  radioPlan?: Record<string, unknown> | null;
  insertion?: InfilExfilMethod[] | null;
  extraction?: InfilExfilMethod[] | null;
  assetsAvailable?: FridaySideOpInput["assetsAvailable"];
}

export async function updateFridaySideOp(
  input: UpdateFridaySideOpInput,
): Promise<ActionResult<{ missionId: number }>> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const mission = await payload.findByID({
      collection: "missions",
      id: input.missionId,
      depth: 0,
    });

    const canManage = await hasPermission(payload, user, "missions:update");
    if (!canManage && !isSideOpOwner(mission, userId)) {
      return {
        success: false,
        error: "Only the player who scheduled this side operation can edit it.",
      };
    }
    if (["Completed", "Cancelled"].includes(mission.ownershipAndStatus.status)) {
      return {
        success: false,
        error: `This mission is ${mission.ownershipAndStatus.status.toLowerCase()} and can no longer be edited.`,
      };
    }

    if (input.startDateTime !== undefined) {
      if (!isFridayDate(input.startDateTime)) {
        return {
          success: false,
          error: "Side operations can only be scheduled on a Friday.",
        };
      }
      const startDate = new Date(input.startDateTime);
      if (Number.isNaN(startDate.getTime())) {
        return { success: false, error: "Invalid start date/time." };
      }
      if (startDate.getTime() <= Date.now()) {
        return { success: false, error: "Side operations must be scheduled in the future." };
      }
      const fridayConflict = await findActiveMissionOnFriday(
        payload,
        input.startDateTime,
        input.missionId,
      );
      if (fridayConflict) {
        return {
          success: false,
        error: `That Friday is already taken by "${fridayConflict.name}" (${fridayConflict.codeName}). Only one operation per Friday, first come first served.`,
        };
      }
    }

    let resolvedCampaignId: number | null = null;
    let campaignChangeRequested = false;
    if (input.noCampaign) {
      campaignChangeRequested = true;
    } else if (input.campaignId != null || (input.newCampaignName && input.newCampaignName.trim())) {
      const resolved = await resolveSideOpCampaign(
        payload,
        user,
        input.campaignId ?? null,
        input.newCampaignName ?? null,
      );
      resolvedCampaignId = resolved.campaignId;
      campaignChangeRequested = true;
    }

    type SideOpClassificationUpdate = {
      map?: number;
      missionType?: Mission["classification"]["missionType"];
      campaign?: number | null;
      startDateTime?: string;
      estimatedDuration?: number;
    };
    const classification: SideOpClassificationUpdate = {};
    const data: {
      name?: string;
      codeName?: string | null;
      summary?: string;
      coverImage?: number | null;
      classification?: SideOpClassificationUpdate;
      missionRoles?: { maxPlayers?: number };
      gameDetails?: { gameSetup?: { requiredMods?: number | null } };
    } = {};
    if (input.name !== undefined) data.name = input.name.trim();
    if (input.codeName !== undefined) data.codeName = input.codeName.trim() || null;
    if (input.summary !== undefined) data.summary = input.summary.trim();
    if (input.coverImageId !== undefined) data.coverImage = input.coverImageId;
    if (input.estimatedDuration !== undefined) {
      classification.estimatedDuration = input.estimatedDuration;
    }
    if (input.mapId !== undefined || input.customMapName !== undefined) {
      const resolvedMapId = await resolveSideOpMap(payload, {
        mapId: input.mapId,
        customMapName: input.customMapName,
      });
      if (resolvedMapId != null) {
        classification.map = resolvedMapId;
      }
    }
    if (input.missionType !== undefined) {
      classification.missionType = input.missionType;
    }
    if (input.startDateTime !== undefined) {
      classification.startDateTime = fridayStartDateTime(input.startDateTime);
    }
    if (campaignChangeRequested) {
      classification.campaign = resolvedCampaignId;
    }
    if (Object.keys(classification).length > 0) {
      data.classification = classification;
    }
    if (input.maxPlayers !== undefined) {
      data.missionRoles = { maxPlayers: input.maxPlayers };
    }
    if (input.requiredModsId !== undefined) {
      data.gameDetails = { gameSetup: { requiredMods: input.requiredModsId } };
    }
    const narrative = narrativeData(input);
    if (!narrative.success) return narrative;
    Object.assign(data, narrative.data);

    const updated = await payload.update({
      collection: "missions",
      id: input.missionId,
      depth: 0,
      overrideAccess: true,
      data,
    });

    await emitGameEvent(payload, {
      type: EventTypes.MissionUpdate,
      message: `${user.displayName || user.username} updated side operation "${missionRef(updated)}".`,
      actor: userId,
      targetCollection: "missions",
      targetId: updated.id,
      data: { fields: Object.keys(data) },
    });

    return { success: true, data: { missionId: updated.id } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

export async function cancelFridaySideOp(
  missionId: number,
): Promise<ActionResult<{ missionId: number }>> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const mission = await payload.findByID({
      collection: "missions",
      id: missionId,
      depth: 0,
    });

    const canManage =
      (await hasPermission(payload, user, "missions:update")) ||
      (await hasPermission(payload, user, "missions:delete"));
    if (!canManage && !isSideOpOwner(mission, userId)) {
      return {
        success: false,
        error: "Only the player who scheduled this side operation can cancel it.",
      };
    }
    if (["Completed", "Cancelled"].includes(mission.ownershipAndStatus.status)) {
      return {
        success: false,
        error: `This mission is already ${mission.ownershipAndStatus.status.toLowerCase()}.`,
      };
    }

    const updated = await payload.update({
      collection: "missions",
      id: missionId,
      depth: 0,
      overrideAccess: true,
      data: {
        ownershipAndStatus: {
          status: "Cancelled",
        },
      },
    });

    await emitGameEvent(payload, {
      type: EventTypes.MissionCancel,
      message: `${user.displayName || user.username} cancelled side operation "${missionRef(updated)}".`,
      actor: userId,
      targetCollection: "missions",
      targetId: updated.id,
    });

    return { success: true, data: { missionId: updated.id } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

export async function markSideOpScheduled(
  missionId: number,
): Promise<ActionResult<{ missionId: number }>> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const mission = await payload.findByID({
      collection: "missions",
      id: missionId,
      depth: 0,
    });

    const canManage = await hasPermission(payload, user, "missions:update");
    if (!canManage && !isSideOpOwner(mission, userId)) {
      return {
        success: false,
        error: "Only the player who scheduled this side operation can commit it to the schedule.",
      };
    }

    const status = mission.ownershipAndStatus.status;
    if (status === "Scheduled") {
      return { success: true, data: { missionId: mission.id } };
    }
    if (!["Concept", "Planning", "Ready"].includes(status)) {
      return {
        success: false,
        error:
          status === "Active"
            ? "This mission is already underway and cannot be scheduled."
            : `This mission is ${status.toLowerCase()} and can no longer be scheduled.`,
      };
    }

    const updated = await payload.update({
      collection: "missions",
      id: missionId,
      depth: 0,
      overrideAccess: true,
      data: {
        ownershipAndStatus: {
          status: "Scheduled",
        },
      },
    });

    await emitGameEvent(payload, {
      type: EventTypes.MissionCommit,
      message: `${user.displayName || user.username} committed side operation "${missionRef(updated)}" to the schedule. The roll-call will be posted and the mission hooks delivered.`,
      actor: userId,
      targetCollection: "missions",
      targetId: updated.id,
    });

    return { success: true, data: { missionId: updated.id } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

export async function moveFridaySideOpToCampaign(
  missionId: number,
  campaignId: number,
): Promise<ActionResult<{ missionId: number }>> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const mission = await payload.findByID({
      collection: "missions",
      id: missionId,
      depth: 0,
    });

    const canManage = await hasPermission(payload, user, "missions:update");
    if (!canManage && !isSideOpOwner(mission, userId)) {
      return {
        success: false,
        error: "Only the player who scheduled this side operation can move it.",
      };
    }

    const campaign = await payload.findByID({
      collection: "campaigns",
      id: campaignId,
      depth: 0,
    });
    const ownerId = typeof campaign.owner === "object" ? campaign.owner?.id : campaign.owner;
    if (ownerId !== userId) {
      return { success: false, error: "You can only move missions into campaigns you own." };
    }

    await payload.update({
      collection: "missions",
      id: missionId,
      depth: 0,
      overrideAccess: true,
      data: {
        classification: {
          campaign: campaignId,
        },
      },
    });

    await emitGameEvent(payload, {
      type: EventTypes.MissionMoveCampaign,
      message: `${user.displayName || user.username} moved side operation "${missionRef(mission)}" to campaign "${campaign.name}".`,
      actor: userId,
      targetCollection: "missions",
      targetId: missionId,
      data: { campaignId },
    });

    return { success: true, data: { missionId } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

// ---------------------------------------------------------------------------
// Role sign-ups
// ---------------------------------------------------------------------------

export async function signupForMissionRole(input: {
  missionId: number;
  roleIndex: number;
}): Promise<ActionResult> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const mission = await payload
      .findByID({
        collection: "missions",
        id: input.missionId,
        depth: 0,
        user,
        overrideAccess: false,
      })
      .catch(() => null);
    if (!mission) {
      return { success: false, error: "You do not have access to this mission." };
    }

    await signupForRole(payload, {
      missionId: input.missionId,
      userId,
      roleIndex: input.roleIndex,
      bypassEligibility: isAdminOrDeveloper(user as User),
    });

    return { success: true };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

export async function withdrawMissionRoleSignup(input: {
  missionId: number;
}): Promise<ActionResult> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const mission = await payload
      .findByID({
        collection: "missions",
        id: input.missionId,
        depth: 0,
        user,
        overrideAccess: false,
      })
      .catch(() => null);
    if (!mission) {
      return { success: false, error: "You do not have access to this mission." };
    }

    await withdrawRoleSignup(payload, { missionId: input.missionId, userId });

    return { success: true };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}

export async function removeMissionRoleSignup(input: {
  missionId: number;
  signupId: number;
}): Promise<ActionResult> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const canManage = await hasPermission(payload, user, "missions:update");
    if (!canManage) {
      return { success: false, error: "You do not have permission to manage role sign-ups." };
    }

    await removeRoleSignup(payload, {
      missionId: input.missionId,
      signupId: input.signupId,
      actorId: userId,
    });

    return { success: true };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    return message === "Unauthorized"
      ? { success: false, error: "You must be logged in." }
      : { success: false, error: message };
  }
}