"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 { broadcastToUser } from "@/lib/realtime/bus";
import { notifyUser } from "@/lib/notifications";
import hasRoles from "@/utils/access-control/hasRoles";
import { isPayloadUser } from "@/utils/access-control/isPayloadUser";
import type { VoiceScript, VoiceSubmission } from "@/payload-types";

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

/** Server actions body limit is 10mb — enforce a 9 MB cap server-side with a clear error. */
const MAX_AUDIO_BYTES = 9 * 1024 * 1024;

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

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

export async function submitVoiceRecording(
  scriptId: number,
  formData: FormData,
): Promise<ActionResult<{ id: number }>> {
  try {
    const { payload, user } = await authenticate();

    const script = await fetchScript(payload, scriptId);
    if (!script) {
      return { success: false, error: "Voiceover script not found." };
    }
    if (script.status !== "open") {
      return { success: false, error: "This script is closed to new submissions." };
    }

    const file = formData.get("file");
    if (!(file instanceof File)) {
      return { success: false, error: "No audio file provided." };
    }
    if (!file.type.startsWith("audio/")) {
      return { success: false, error: "Only audio files can be submitted." };
    }
    if (file.size > MAX_AUDIO_BYTES) {
      return { success: false, error: "Audio recordings must be 9 MB or smaller." };
    }

    const submission = await payload.create({
      collection: "voice-submissions",
      data: {
        script: scriptId,
        user: user.id,
        status: "pending",
      },
      file: {
        data: Buffer.from(await file.arrayBuffer()),
        mimetype: file.type,
        name: file.name,
        size: file.size,
      },
      overrideAccess: true,
      depth: 0,
    });

    await emitGameEvent(payload, {
      type: EventTypes.VoiceoverSubmit,
      message: `${user.displayName ?? user.username} submitted a recording for "${script.title}"`,
      actor: user.id,
      targetCollection: "voice-submissions",
      targetId: submission.id,
      data: { scriptId, scriptTitle: script.title },
    });

    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 withdrawSubmission(
  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: "voice-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 reviewVoiceSubmission(
  submissionId: number,
  decision: "accepted" | "rejected",
  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 can review voiceover 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." };
    }

    const script = await fetchScript(
      payload,
      typeof submission.script === "number" ? submission.script : submission.script.id,
    );
    if (!script) {
      return { success: false, error: "The script for this submission no longer exists." };
    }

    const submitterId = typeof submission.user === "number" ? submission.user : submission.user.id;

    // Resolve the profile before mutating anything so a missing profile fails
    // the review cleanly instead of leaving the submission accepted without XP.
    let profileId: number | undefined;
    let progression: {
      xp?: unknown;
      voiceover?: { xpEarned?: number };
    } = {};
    if (decision === "accepted") {
      const profileRes = await payload.find({
        collection: "profiles",
        where: { user: { equals: submitterId } },
        limit: 1,
        depth: 0,
        overrideAccess: true,
      });
      const profile = profileRes.docs[0];
      if (!profile) {
        return { success: false, error: "No profile found for the submitter." };
      }
      profileId = profile.id;
      progression = (profile.progression ?? {}) as {
        xp?: unknown;
        voiceover?: { xpEarned?: number };
      };
    }

    await payload.update({
      collection: "voice-submissions",
      id: submissionId,
      data: {
        status: decision,
        reviewNote: reviewNote ?? null,
      },
      overrideAccess: true,
      depth: 0,
    });

    if (decision === "accepted" && profileId !== undefined) {
      const voiceover = progression.voiceover ?? {};
      const xpEarned = (voiceover.xpEarned ?? 0) + script.xpAmount;
      // Strip the virtual `xp` field before writing (computed, not stored).
      const { xp: _xp, ...progressionRest } = progression;

      await payload.update({
        collection: "profiles",
        id: profileId,
        data: {
          progression: {
            ...progressionRest,
            voiceover: {
              ...voiceover,
              xpEarned,
            },
          },
        },
        overrideAccess: true,
        depth: 0,
      });
      broadcastToUser("profile-update", submitterId, {
        reason: "xp",
        xpGained: script.xpAmount,
        profileId,
      });
      await notifyUser(payload, {
        userId: submitterId,
        type: "voiceover:accepted",
        title: "Voiceover accepted",
        message: `Your recording for "${script.title}" was accepted (+${script.xpAmount} XP).`,
        link: "/voiceover",
      });
    } else {
      await notifyUser(payload, {
        userId: submitterId,
        type: "voiceover:rejected",
        title: "Voiceover rejected",
        message: `Your recording for "${script.title}" was not accepted this time.`,
        link: "/voiceover",
      });
    }

    await emitGameEvent(payload, {
      type: decision === "accepted" ? EventTypes.VoiceoverAccepted : EventTypes.VoiceoverRejected,
      message: `${user.displayName ?? user.username} ${decision} a voiceover submission for "${script.title}"`,
      actor: user.id,
      targetCollection: "voice-submissions",
      targetId: submissionId,
      data: {
        scriptId: script.id,
        scriptTitle: script.title,
        submitterId,
        decision,
        reviewNote: reviewNote ?? null,
        xpAwarded: decision === "accepted" ? script.xpAmount : 0,
      },
    });

    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 };
  }
}