"use server";

import config from "@payload-config";
import { isPayloadUser } from "@/utils/access-control/isPayloadUser";
import { getPayload } from "payload";
import type { User, WikiPage } from "@/payload-types";
import { hasIntelligenceQualification } from "@/utils/access-control/hasIntelligenceQualification";
import { emitGameEvent } from "@/utils/event-log/emit";
import { EventTypes } from "@/utils/event-log/eventTypes";
import {
  createPage,
  deletePage,
  restoreRevision,
  setPageLockdown as setPageLockdownService,
  updatePage,
} from "@/lib/wiki/service";

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

  return { payload, user };
}

async function fetchPage(
  payload: Awaited<ReturnType<typeof getPayload>>,
  id: number,
): Promise<WikiPage | null> {
  try {
    return (await payload.findByID({
      collection: "wiki-pages",
      id,
      depth: 0,
      overrideAccess: true,
    })) as unknown as WikiPage;
  } catch {
    return null;
  }
}

async function isWikiModerator(
  payload: Awaited<ReturnType<typeof getPayload>>,
  user: User,
): Promise<boolean> {
  return hasIntelligenceQualification(payload, user);
}

export async function createWikiPage(input: {
  title: string;
  category: string;
  tags?: string[];
  body: string;
  summary?: string;
}): Promise<ActionResult<{ id: number; slug: string }>> {
  try {
    const { payload, user } = await authenticate();
    const page = await createPage(payload, user, input);
    await emitGameEvent(payload, {
      type: EventTypes.WikiPageCreate,
      message: `${user.displayName ?? user.username} created wiki page "${input.title}"`,
      actor: user.id,
      targetCollection: "wiki-pages",
      targetId: page.id,
      data: { slug: page.slug },
    });
    return { success: true, data: { id: page.id, slug: page.slug } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    if (message === "Unauthorized") {
      return { success: false, error: "You must be logged in." };
    }
    return { success: false, error: message };
  }
}

export async function updateWikiPage(input: {
  id: number;
  title?: string;
  body?: string;
  category?: string;
  tags?: string[];
  summary?: string;
}): Promise<ActionResult<{ id: number; slug: string }>> {
  try {
    const { payload, user } = await authenticate();
    const page = await fetchPage(payload, input.id);
    if (!page) return { success: false, error: "Wiki page not found." };
    const updated = await updatePage(payload, user, page, input);
    await emitGameEvent(payload, {
      type: EventTypes.WikiPageEdit,
      message: `${user.displayName ?? user.username} edited wiki page "${updated.title}"`,
      actor: user.id,
      targetCollection: "wiki-pages",
      targetId: updated.id,
      data: { slug: updated.slug },
    });
    return { success: true, data: { id: updated.id, slug: updated.slug } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    if (message === "Unauthorized") {
      return { success: false, error: "You must be logged in." };
    }
    return { success: false, error: message };
  }
}

export async function restoreWikiRevision(input: {
  id: number;
  revisionNumber: number;
}): Promise<ActionResult<{ id: number; slug: string }>> {
  try {
    const { payload, user } = await authenticate();
    if (!(await isWikiModerator(payload, user))) {
      return {
        success: false,
        error: "You need intelligence division clearance to restore wiki pages.",
      };
    }
    const page = await fetchPage(payload, input.id);
    if (!page) return { success: false, error: "Wiki page not found." };
    const updated = await restoreRevision(payload, user, page, input.revisionNumber);
    await emitGameEvent(payload, {
      type: EventTypes.WikiPageRestore,
      message: `${user.displayName ?? user.username} restored wiki page "${updated.title}" to revision ${input.revisionNumber}`,
      actor: user.id,
      targetCollection: "wiki-pages",
      targetId: updated.id,
      data: { slug: updated.slug, revisionNumber: input.revisionNumber },
    });
    return { success: true, data: { id: updated.id, slug: updated.slug } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    if (message === "Unauthorized") {
      return { success: false, error: "You must be logged in." };
    }
    return { success: false, error: message };
  }
}

export async function setPageLockdown(input: {
  id: number;
  lockdown: boolean;
}): Promise<ActionResult<{ id: number; slug: string; lockdown: boolean }>> {
  try {
    const { payload, user } = await authenticate();
    if (!(await isWikiModerator(payload, user))) {
      return {
        success: false,
        error: "You need intelligence division clearance to lock wiki pages.",
      };
    }
    const page = await fetchPage(payload, input.id);
    if (!page) return { success: false, error: "Wiki page not found." };
    const updated = await setPageLockdownService(payload, user, page, input.lockdown);
    await emitGameEvent(payload, {
      type: input.lockdown ? EventTypes.WikiPageLock : EventTypes.WikiPageUnlock,
      message: `${user.displayName ?? user.username} ${input.lockdown ? "locked" : "unlocked"} wiki page "${updated.title}"`,
      actor: user.id,
      targetCollection: "wiki-pages",
      targetId: updated.id,
      data: { slug: updated.slug, lockdown: input.lockdown },
    });
    return {
      success: true,
      data: { id: updated.id, slug: updated.slug, lockdown: input.lockdown },
    };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    if (message === "Unauthorized") {
      return { success: false, error: "You must be logged in." };
    }
    return { success: false, error: message };
  }
}

export async function deleteWikiPage(input: { id: number }): Promise<ActionResult<{ ok: true }>> {
  try {
    const { payload, user } = await authenticate();
    if (!(await isWikiModerator(payload, user))) {
      return {
        success: false,
        error: "You need intelligence division clearance to delete wiki pages.",
      };
    }
    const page = await fetchPage(payload, input.id);
    if (!page) return { success: false, error: "Wiki page not found." };
    await deletePage(payload, user, page);
    await emitGameEvent(payload, {
      type: EventTypes.WikiPageDelete,
      message: `${user.displayName ?? user.username} deleted wiki page "${page.title}"`,
      actor: user.id,
      targetCollection: "wiki-pages",
      targetId: page.id,
      data: { slug: page.slug },
    });
    return { success: true, data: { ok: true } };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    if (message === "Unauthorized") {
      return { success: false, error: "You must be logged in." };
    }
    return { success: false, error: message };
  }
}

export async function uploadWikiImage(
  formData: FormData,
): Promise<ActionResult<{ url: string; filename: string; alt: string }>> {
  try {
    const { payload } = await authenticate();
    const file = formData.get("file");
    if (!(file instanceof File)) {
      return { success: false, error: "No image file provided." };
    }
    if (!file.type.startsWith("image/")) {
      return { success: false, error: "Only image files can be uploaded." };
    }
    if (file.size > 8 * 1024 * 1024) {
      return { success: false, error: "Images must be 8 MB or smaller." };
    }
    const alt =
      file.name
        .replace(/\.[^/.]+$/, "")
        .replace(/[^a-zA-Z0-9 _-]/g, "")
        .trim() || "Image";
    const doc = await payload.create({
      collection: "media",
      data: { alt },
      file: {
        data: Buffer.from(await file.arrayBuffer()),
        mimetype: file.type,
        name: file.name,
        size: file.size,
      },
      overrideAccess: true,
    });
    if (!doc.filename) {
      return { success: false, error: "Upload failed: no file was stored." };
    }
    return {
      success: true,
      data: { url: doc.url ?? `/api/media/file/${doc.filename}`, filename: doc.filename, alt },
    };
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unknown error";
    if (message === "Unauthorized") {
      return { success: false, error: "You must be logged in." };
    }
    return { success: false, error: message };
  }
}