"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 hasRoles from "@/utils/access-control/hasRoles";
import { isPayloadUser } from "@/utils/access-control/isPayloadUser";
import { validateRibbonDesign } from "@/lib/awards/ribbonValidation";
import type { RibbonSubmission } from "@/payload-types";

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

const MAX_PENDING_RIBBON_SUBMISSIONS = 15;

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 fetchSubmission(
  payload: Awaited<ReturnType<typeof getPayload>>,
  id: number,
): Promise<RibbonSubmission | null> {
  try {
    return await payload.findByID({
      collection: "ribbon-submissions",
      id,
      depth: 0,
      overrideAccess: true,
    });
  } catch {
    return null;
  }
}

export async function submitRibbonDesign(input: {
  name: string;
  description: string;
  design: Record<string, unknown>;
}): Promise<ActionResult<{ id: number }>> {
  try {
    const { payload, user } = await authenticate();

    const trimmedName = input.name.trim();
    if (trimmedName.length === 0) {
      return { success: false, error: "A ribbon name is required." };
    }
    if (trimmedName.length > 60) {
      return { success: false, error: "Ribbon names must be 60 characters or fewer." };
    }

    const trimmedDescription = input.description.trim();
    if (trimmedDescription.length === 0) {
      return { success: false, error: "A ribbon description is required." };
    }
    if (trimmedDescription.length > 300) {
      return { success: false, error: "Ribbon descriptions must be 300 characters or fewer." };
    }

    const validation = validateRibbonDesign(input.design);
    if (!validation.ok) {
      return { success: false, error: validation.error };
    }

    const pendingCount = await payload.count({
      collection: "ribbon-submissions",
      where: {
        and: [
          { user: { equals: user.id } },
          { status: { equals: "pending" } },
        ],
      },
      overrideAccess: true,
    });
    if (pendingCount.totalDocs >= MAX_PENDING_RIBBON_SUBMISSIONS) {
      return {
        success: false,
        error: `You already have ${MAX_PENDING_RIBBON_SUBMISSIONS} pending ribbon submissions. Wait for them to be reviewed first.`,
      };
    }

    const submission = await payload.create({
      collection: "ribbon-submissions",
      data: {
        name: trimmedName,
        description: trimmedDescription,
        design: input.design,
        user: user.id,
        status: "pending",
      },
      overrideAccess: true,
      depth: 0,
    });

    await emitGameEvent(payload, {
      type: EventTypes.AwardRibbonSubmitted,
      message: `${user.displayName ?? user.username} submitted the ribbon design "${trimmedName}"`,
      actor: user.id,
      targetCollection: "ribbon-submissions",
      targetId: submission.id,
      data: {
        submissionId: submission.id,
        submitterId: user.id,
        name: trimmedName,
      },
    });

    return { success: true, data: { id: submission.id } };
  } 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 withdrawRibbonSubmission(submissionId: number): Promise<ActionResult<{ ok: true }>> {
  try {
    const { payload, user } = await authenticate();

    const submission = await fetchSubmission(payload, submissionId);
    if (!submission) {
      return { success: false, error: "Submission not found." };
    }
    if (submission.user !== user.id) {
      return { success: false, error: "You can only withdraw your own submissions." };
    }
    if (submission.status !== "pending") {
      return { success: false, error: "Only pending submissions can be withdrawn." };
    }

    await payload.delete({
      collection: "ribbon-submissions",
      id: submissionId,
      overrideAccess: true,
    });

    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 reviewRibbonSubmission(
  submissionId: number,
  decision: "approved" | "rejected",
  opts?: {
    awardXp?: number;
    grantorTypes?: ("division" | "squad" | "team" | "special")[];
    recipientScope?: "same_command" | "anyone";
    maxGrantsPerGrantor?: number | null;
    finalName?: string;
    reviewNote?: string;
  },
): Promise<ActionResult<{ id: number; status: string }>> {
  try {
    const { payload, user } = await authenticate();

    if (!hasRoles(["admin", "developer"], user)) {
      return { success: false, error: "Only admins and developers can review ribbon submissions." };
    }

    const submission = await fetchSubmission(payload, submissionId);
    if (!submission) {
      return { success: false, error: "Submission not found." };
    }
    if (submission.status !== "pending") {
      return { success: false, error: "This submission has already been reviewed." };
    }

    if (decision === "approved") {
      if (opts?.awardXp === undefined || !Number.isInteger(opts.awardXp) || opts.awardXp < 1) {
        return { success: false, error: "XP must be at least 1." };
      }
      if (!opts?.grantorTypes || !Array.isArray(opts.grantorTypes) || opts.grantorTypes.length === 0) {
        return { success: false, error: "Choose at least one grantor type." };
      }
      const validGrantorTypes = ["division", "squad", "team", "special"];
      for (const grantorType of opts.grantorTypes) {
        if (!validGrantorTypes.includes(grantorType)) {
          return { success: false, error: "Invalid grantor type." };
        }
      }
      if (opts.recipientScope !== undefined && opts.recipientScope !== "same_command" && opts.recipientScope !== "anyone") {
        return { success: false, error: "Whitelist scoping is not available yet." };
      }
    }

    const updateData: Record<string, unknown> = {
      status: decision,
      reviewNote: opts?.reviewNote ?? null,
    };

    if (decision === "approved") {
      updateData.awardXp = opts?.awardXp;
      updateData.grantorTypes = opts?.grantorTypes;
      updateData.recipientScope = opts?.recipientScope ?? "same_command";
      updateData.maxGrantsPerGrantor = opts?.maxGrantsPerGrantor ?? null;
      if (opts?.finalName && opts.finalName.trim() !== "" && opts.finalName.trim() !== submission.name) {
        updateData.name = opts.finalName.trim();
      }
    }

    await payload.update({
      collection: "ribbon-submissions",
      id: submissionId,
      data: updateData,
      overrideAccess: true,
      depth: 0,
    });

    // Check if the afterChange hook reverted the status back to pending due to award creation failure
    const updatedSubmission = await payload.findByID({
      collection: "ribbon-submissions",
      id: submissionId,
      depth: 0,
      overrideAccess: true,
    });

    if (decision === "approved" && updatedSubmission.status === "pending") {
      return { success: false, error: "Approval failed while creating the award. The submission is back to pending; try again." };
    }

    return { success: true, data: { id: submissionId, status: decision } };
  } 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 };
  }
}