"use server";

import { and, eq } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { db } from "@/db";
import { cdn, shareComments, shareTexts } from "@/db/schema";
import { getAdminDiscordIds } from "@/lib/auth/auth";
import { createShare } from "@/lib/share/create";
import { requireShareAuthor } from "@/lib/share/current-author";
import { ShareHttpError } from "@/lib/share/http-error";
import { enforceShareRateLimit } from "@/lib/share/rate-limit";
import {
  validateOptionalImage,
  validateShareComment,
  validateShareDescription,
  validateShareText,
} from "@/lib/share/validation";

type ActionResult =
  | { success: true; id?: string }
  | { success: false; error: string; status: number; retryAfter?: number };

function actionError(error: unknown): ActionResult {
  if (error instanceof ShareHttpError) {
    return {
      success: false,
      error: error.message,
      status: error.status,
      ...(error.retryAfter ? { retryAfter: error.retryAfter } : {}),
    };
  }
  console.error("Share action failed", error);
  return { success: false, error: "Internal server error", status: 500 };
}

export async function createShareAction(formData: FormData): Promise<ActionResult> {
  try {
    const author = await requireShareAuthor();
    const content = validateShareText(formData.get("text"));
    const description = validateShareDescription(formData.get("description"));
    const image = await validateOptionalImage(formData.get("image"));

    await enforceShareRateLimit({
      key: `sender:${author.discordId}`,
      limit: 10,
      windowSeconds: 60 * 60,
    });

    const share = await createShare({
      content,
      description,
      image,
      source: "web",
      author,
    });
    return { success: true, id: share.id };
  } catch (error) {
    return actionError(error);
  }
}

export async function createCommentAction(
  shareId: string,
  body: string
): Promise<ActionResult> {
  try {
    const author = await requireShareAuthor();
    const comment = validateShareComment(body);
    const [share] = await db
      .select({ id: shareTexts.id })
      .from(shareTexts)
      .where(eq(shareTexts.id, shareId))
      .limit(1);
    if (!share) throw new ShareHttpError("Share not found", 404);

    await enforceShareRateLimit({
      key: `comment:${author.discordId}`,
      limit: 30,
      windowSeconds: 60 * 60,
    });

    await db.insert(shareComments).values({
      shareId,
      body: comment,
      authorId: author.userId,
      authorDiscordId: author.discordId,
      authorName: author.displayName,
      authorAvatarUrl: author.avatarUrl,
    });
    revalidatePath(`/share/${shareId}`);
    return { success: true };
  } catch (error) {
    return actionError(error);
  }
}

export async function deleteShareAction(shareId: string): Promise<ActionResult> {
  try {
    const author = await requireShareAuthor();
    const [share] = await db
      .select({
        id: shareTexts.id,
        authorDiscordId: shareTexts.authorDiscordId,
        imageCdnId: shareTexts.imageCdnId,
      })
      .from(shareTexts)
      .where(eq(shareTexts.id, shareId))
      .limit(1);
    if (!share) throw new ShareHttpError("Share not found", 404);
    const isAdmin = getAdminDiscordIds().includes(author.discordId);
    if (share.authorDiscordId !== author.discordId && !isAdmin) {
      throw new ShareHttpError("Forbidden", 403);
    }

    await db.transaction(async (tx) => {
      await tx.delete(shareTexts).where(eq(shareTexts.id, shareId));
      if (share.imageCdnId) {
        await tx.delete(cdn).where(eq(cdn.id, share.imageCdnId));
      }
    });
    revalidatePath(`/share/${shareId}`);
    return { success: true };
  } catch (error) {
    return actionError(error);
  }
}

export async function deleteCommentAction(
  shareId: string,
  commentId: string
): Promise<ActionResult> {
  try {
    const author = await requireShareAuthor();
    const isAdmin = getAdminDiscordIds().includes(author.discordId);
    const ownership = isAdmin
      ? and(
          eq(shareComments.id, commentId),
          eq(shareComments.shareId, shareId)
        )
      : and(
          eq(shareComments.id, commentId),
          eq(shareComments.shareId, shareId),
          eq(shareComments.authorDiscordId, author.discordId)
        );
    const deleted = await db
      .delete(shareComments)
      .where(ownership)
      .returning({ id: shareComments.id });
    if (deleted.length === 0) {
      throw new ShareHttpError("Comment not found or forbidden", 404);
    }
    revalidatePath(`/share/${shareId}`);
    return { success: true };
  } catch (error) {
    return actionError(error);
  }
}