"use server";

import config from "@payload-config";
import { getPayload } from "payload";
import { emitGameEvent } from "@/utils/event-log/emit";
import { EventTypes } from "@/utils/event-log/eventTypes";
import { notifyUser } from "@/lib/notifications";
import {
  MUTEABLE_NOTIFICATION_VALUES,
  type MuteableNotificationType,
} from "@/lib/notifications/notificationTypes";

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) {
    throw new Error("Unauthorized");
  }

  return { payload, user };
}

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

    if (!input.currentPassword || !input.newPassword) {
      return { success: false, error: "Current and new password are required." };
    }
    if (input.newPassword.length < 8) {
      return { success: false, error: "New password must be at least 8 characters." };
    }

    try {
      await payload.login({
        collection: "users",
        data: { username: user.username, password: input.currentPassword },
      });
    } catch {
      return { success: false, error: "Current password is incorrect." };
    }

    await payload.update({
      collection: "users",
      id: userId,
      data: { password: input.newPassword },
      overrideAccess: true,
    });

    await emitGameEvent(payload, {
      type: EventTypes.AccountPasswordChange,
      message: "Password changed",
      actor: userId,
      targetCollection: "users",
      targetId: 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 updateDisplayName(input: { displayName: string }): Promise<ActionResult> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const trimmed = input.displayName.trim();
    if (!trimmed) {
      return { success: false, error: "Display name is required." };
    }
    if (trimmed.length > 60) {
      return { success: false, error: "Display name must be 60 characters or fewer." };
    }

    await payload.update({
      collection: "users",
      id: userId,
      data: { displayName: trimmed },
      overrideAccess: true,
    });

    await emitGameEvent(payload, {
      type: EventTypes.AccountProfileUpdate,
      message: `Updated display name to "${trimmed}"`,
      actor: userId,
      targetCollection: "users",
      targetId: 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 requestDiscordUsernameChange(input: {
  desiredDiscordUsername: string;
}): Promise<ActionResult> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const trimmed = input.desiredDiscordUsername.trim();
    if (!trimmed) {
      return { success: false, error: "Discord username is required." };
    }
    if (trimmed.length < 2 || trimmed.length > 32) {
      return { success: false, error: "Discord usernames must be between 2 and 32 characters." };
    }
    if (/\s/.test(trimmed)) {
      return { success: false, error: "Discord usernames cannot contain spaces." };
    }

    const existingRes = await payload.find({
      collection: "users",
      where: { discordUsername: { equals: trimmed } },
      limit: 1,
      depth: 0,
      overrideAccess: true,
    });
    if (existingRes.docs.some((doc) => doc.id !== userId)) {
      return { success: false, error: "That Discord username is already in use." };
    }

    const staffRoles = await payload.find({
      collection: "roles",
      where: { slug: { in: ["admin", "developer"] } },
      limit: 2,
      depth: 0,
      overrideAccess: true,
    });
    const staffRoleIds = staffRoles.docs.map((d) => d.id);
    if (staffRoleIds.length > 0) {
      const staffRes = await payload.find({
        collection: "users",
        where: { roleDocs: { in: staffRoleIds } },
        limit: 100,
        depth: 0,
        overrideAccess: true,
      });
      const staffIds = [...new Set(staffRes.docs.map((doc) => doc.id as number))].filter(
        (id) => id !== userId,
      );
      for (const staffId of staffIds) {
        await notifyUser(payload, {
          userId: staffId,
          type: "account:discord-request",
          title: `Discord username change requested by ${user.username}`,
          message: `wants to change their Discord username to "${trimmed}".`,
          link: `/admin/collections/users/${userId}`,
        });
      }
    }

    await notifyUser(payload, {
      userId,
      type: "account:discord-request",
      title: "Request submitted",
      message: `Your request to change your Discord username to "${trimmed}" has been sent to leadership.`,
    });

    await emitGameEvent(payload, {
      type: EventTypes.AccountDiscordRequest,
      message: `Requested a Discord username change to "${trimmed}"`,
      actor: userId,
      targetCollection: "users",
      targetId: userId,
      data: { requestedDiscordUsername: trimmed },
    });

    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 updatePreferences(input: {
  mutedAll: boolean;
  mutedTypes: string[];
  showCallsign: boolean;
  showVersionOverlay: boolean;
  leadOrActual: "lead" | "actual";
  discordEnabled: boolean;
  discordMutedTypes: string[];
}): Promise<ActionResult> {
  try {
    const { payload, user } = await authenticate();
    const userId = user.id as number;

    const mutedTypes = input.mutedTypes.filter((t): t is MuteableNotificationType =>
      (MUTEABLE_NOTIFICATION_VALUES as readonly string[]).includes(t),
    );
    const discordMutedTypes = input.discordMutedTypes.filter((t): t is MuteableNotificationType =>
      (MUTEABLE_NOTIFICATION_VALUES as readonly string[]).includes(t),
    );

    await payload.update({
      collection: "users",
      id: userId,
      data: {
        preferences: {
          notifications: { mutedAll: input.mutedAll, mutedTypes },
          display: {
            showCallsign: input.showCallsign,
            showVersionOverlay: input.showVersionOverlay,
            leadOrActual: input.leadOrActual,
          },
          discord: {
            enabled: input.discordEnabled,
            mutedTypes: discordMutedTypes,
          },
        },
      },
      overrideAccess: true,
    });

    await emitGameEvent(payload, {
      type: EventTypes.AccountPreferencesUpdate,
      message: "Updated preferences",
      actor: userId,
      targetCollection: "users",
      targetId: 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 };
  }
}