"use server";

import config from "@payload-config";
import { getPayload } from "payload";

import {
  OPORD_DIFFICULTIES,
  QUIZ_TIME_GRACE_MS,
  calculateOpordAccuracy,
  calculateOpordScore,
  calculateOpordXp,
  isOpordDifficulty,
  minOpordRunTimeMs,
  type OpordDifficulty,
} from "@/lib/opord-recall";
import { emitGameEvent } from "@/utils/event-log/emit";
import { EventTypes } from "@/utils/event-log/eventTypes";
import { broadcastToUser } from "@/lib/realtime/bus";

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

export interface OpordStats {
  gamesPlayed: number;
  bestScore: number;
  bestAccuracy: number;
  recruitBestScore: number;
  veteranBestScore: number;
  eliteBestScore: number;
  opordRecallXp: number;
  xpEarned: number;
  score: number;
  accuracy: number;
}

export type OpordRunInput = {
  difficulty: OpordDifficulty;
  correct: number;
  timeMs: number;
};

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 submitOpordRecallResult(
  input: OpordRunInput,
): Promise<ActionResult<OpordStats>> {
  try {
    const { payload, user } = await authenticate();

    if (!isOpordDifficulty(input.difficulty)) {
      return { success: false, error: "Invalid difficulty." };
    }

    const tier = OPORD_DIFFICULTIES[input.difficulty];
    const { correct, timeMs } = input;
    const minTimeMs = minOpordRunTimeMs(input.difficulty);
    const maxTimeMs = tier.quizSeconds * 1000 + QUIZ_TIME_GRACE_MS;
    if (
      !Number.isInteger(correct) ||
      correct < 0 ||
      correct > tier.questionCount ||
      typeof timeMs !== "number" ||
      !Number.isFinite(timeMs) ||
      timeMs < minTimeMs ||
      timeMs > maxTimeMs
    ) {
      return { success: false, error: "Invalid result." };
    }

    const profileRes = await payload.find({
      collection: "profiles",
      where: { user: { equals: user.id as number } },
      limit: 1,
      depth: 0,
      overrideAccess: true,
    });
    const profile = profileRes.docs[0];
    if (!profile) {
      return { success: false, error: "No profile found for this user." };
    }

    const progression = (profile.progression ?? {}) as {
      xp?: unknown;
      minigames?: {
        opordRecall?: {
          gamesPlayed?: number;
          bestScore?: number;
          bestAccuracy?: number;
          recruitBestScore?: number;
          veteranBestScore?: number;
          eliteBestScore?: number;
          xpEarned?: number;
        };
      };
    };
    const current = progression.minigames?.opordRecall ?? {};

    const score = calculateOpordScore(input.difficulty, correct, timeMs);
    const accuracy = calculateOpordAccuracy(correct, tier.questionCount);
    const tierBestScoreKey = `${input.difficulty}BestScore` as
      | "recruitBestScore"
      | "veteranBestScore"
      | "eliteBestScore";
    const isNewTierBest = score > (current[tierBestScoreKey] ?? 0);
    const xp = calculateOpordXp(score, isNewTierBest);

    const gamesPlayed = (current.gamesPlayed ?? 0) + 1;
    const bestScore = Math.max(current.bestScore ?? 0, score);
    const bestAccuracy =
      Math.round(Math.max(current.bestAccuracy ?? 0, accuracy) * 10000) / 10000;
    const tierBestScore = Math.max(current[tierBestScoreKey] ?? 0, score);
    const opordRecallXp = (current.xpEarned ?? 0) + xp;

    const recruitBestScore =
      input.difficulty === "recruit" ? tierBestScore : (current.recruitBestScore ?? 0);
    const veteranBestScore =
      input.difficulty === "veteran" ? tierBestScore : (current.veteranBestScore ?? 0);
    const eliteBestScore =
      input.difficulty === "elite" ? tierBestScore : (current.eliteBestScore ?? 0);

    const { xp: _xp, ...progressionRest } = progression;

    await payload.update({
      collection: "profiles",
      id: profile.id,
      data: {
        progression: {
          ...progressionRest,
          minigames: {
            ...(progressionRest.minigames ?? {}),
            opordRecall: {
              gamesPlayed,
              bestScore,
              bestAccuracy,
              recruitBestScore,
              veteranBestScore,
              eliteBestScore,
              xpEarned: opordRecallXp,
            },
          },
        },
      },
      overrideAccess: true,
      depth: 0,
    });
    broadcastToUser("profile-update", Number(user.id), {
      reason: "xp",
      xpGained: xp,
      profileId: profile.id,
    });

    if (score > 0) {
      const pct = Math.round(accuracy * 100);
      await emitGameEvent(payload, {
        type: EventTypes.MinigameOpordRecall,
        message: `recalled an ${input.difficulty} briefing with ${correct}/${tier.questionCount} details correct (${pct}% accuracy, +${xp} XP)`,
        actor: user.id as number,
        targetCollection: "users",
        targetId: user.id as number,
        data: {
          difficulty: input.difficulty,
          correct,
          total: tier.questionCount,
          score,
          accuracy,
          timeMs: Math.round(timeMs),
          xpEarned: xp,
          bestScore,
          tierBestScore,
          opordRecallXp,
        },
      });
    }

    return {
      success: true,
      data: {
        gamesPlayed,
        bestScore,
        bestAccuracy,
        recruitBestScore,
        veteranBestScore,
        eliteBestScore,
        opordRecallXp,
        xpEarned: xp,
        score,
        accuracy,
      },
    };
  } 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 };
  }
}