/**
 * @file Transcendence routes handling transcendence resets and echo upgrade purchases.
 * @copyright nhcarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */
/* eslint-disable max-lines-per-function -- Route handlers require many steps */
/* eslint-disable max-statements -- Route handlers require many statements */

import { Hono } from "hono";
import { defaultTranscendenceUpgrades } from "../data/transcendenceUpgrades.js";
import { prisma } from "../db/client.js";
import { authMiddleware } from "../middleware/auth.js";
import { logger } from "../services/logger.js";
import {
  buildPostTranscendenceState,
  computeTranscendenceMultipliers,
  isEligibleForTranscendence,
} from "../services/transcendence.js";
import { postMilestoneWebhook } from "../services/webhook.js";
import type { HonoEnvironment } from "../types/hono.js";
import type { BuyEchoUpgradeRequest, GameState } from "@elysium/types";

const transcendenceRouter = new Hono<HonoEnvironment>();

transcendenceRouter.use("*", authMiddleware);

transcendenceRouter.post("/", async(context) => {
  try {
    const discordId = context.get("discordId");

    const record = await prisma.gameState.findUnique({ where: { discordId } });
    if (!record) {
      return context.json({ error: "No save found" }, 404);
    }

    /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Prisma returns JsonValue */
    const state = record.state as unknown as GameState;

    if (!isEligibleForTranscendence(state)) {
      return context.json(
        {
          // eslint-disable-next-line stylistic/max-len -- Error message cannot be shortened
          error: "Not eligible for transcendence — defeat The Absolute One first",
        },
        400,
      );
    }

    const {
      echoesEarned,
      transcendenceData,
      transcendenceState,
    } = buildPostTranscendenceState(state, state.player.characterName);

    // Capture current-run stats before the nuclear reset
    const runBossesDefeated = state.bosses.filter((boss) => {
      return boss.status === "defeated";
    }).length;
    // eslint-disable-next-line capitalized-comments -- v8 ignore
    /* v8 ignore next 7 -- @preserve */
    const runQuestsCompleted = state.quests.filter((quest) => {
      return quest.status === "completed";
    }).length;
    let runAdventurersRecruited = 0;
    for (const adventurer of state.adventurers) {
      runAdventurersRecruited = runAdventurersRecruited + adventurer.count;
    }

    // eslint-disable-next-line capitalized-comments -- v8 ignore
    /* v8 ignore next 3 -- @preserve */
    const runAchievementsUnlocked = state.achievements.filter((achievement) => {
      return achievement.unlockedAt !== null;
    }).length;

    const now = Date.now();
    await prisma.gameState.update({
      /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Prisma requires object */
      data:  { state: transcendenceState as object, updatedAt: now },
      where: { discordId },
    });

    await prisma.player.update({
      data: {
        characterName: state.player.characterName,

        lastSavedAt: now,

        lifetimeAchievementsUnlocked: { increment: runAchievementsUnlocked },

        lifetimeAdventurersRecruited: { increment: runAdventurersRecruited },

        lifetimeBossesDefeated: { increment: runBossesDefeated },

        lifetimeClicks: { increment: state.player.totalClicks },

        // Accumulate into lifetime totals
        lifetimeGoldEarned: { increment: state.player.totalGoldEarned },

        lifetimeQuestsCompleted: { increment: runQuestsCompleted },

        totalClicks:     0,
        // Reset current-run counters (same as prestige)
        totalGoldEarned: 0,
      },
      where: { discordId },
    });

    const transcendenceCount = transcendenceData.count;
    void logger.metric("transcendence", 1, { discordId, transcendenceCount });
    void postMilestoneWebhook(discordId, "transcendence", {
      // eslint-disable-next-line capitalized-comments -- v8 ignore
      /* v8 ignore next -- @preserve */
      // eslint-disable-next-line capitalized-comments -- v8 ignore
      /* v8 ignore next -- @preserve */
      apotheosis: transcendenceState.apotheosis?.count ?? 0,

      prestige: transcendenceState.prestige.count,

      transcendence: transcendenceData.count,
    });

    return context.json({
      echoes:                echoesEarned,
      // eslint-disable-next-line unicorn/no-keyword-prefix -- API response field name required by client
      newTranscendenceCount: transcendenceData.count,
    });
  } catch (error) {
    void logger.error(
      "transcendence",
      error instanceof Error
        ? error
        : new Error(String(error)),
    );
    return context.json({ error: "Internal server error" }, 500);
  }
});

transcendenceRouter.post("/buy-upgrade", async(context) => {
  try {
    const discordId = context.get("discordId");
    const body = await context.req.json<BuyEchoUpgradeRequest>();

    const { upgradeId } = body;
    // eslint-disable-next-line @typescript-eslint/strict-boolean-expressions -- Runtime body validation
    if (!upgradeId) {
      return context.json({ error: "upgradeId is required" }, 400);
    }

    // eslint-disable-next-line stylistic/max-len -- Variable name mirrors the data source for clarity
    const upgrade = defaultTranscendenceUpgrades.find((transcendenceUpgrade) => {
      return transcendenceUpgrade.id === upgradeId;
    });
    if (!upgrade) {
      return context.json({ error: "Unknown echo upgrade" }, 404);
    }

    const record = await prisma.gameState.findUnique({ where: { discordId } });
    if (!record) {
      return context.json({ error: "No save found" }, 404);
    }

    /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Prisma returns JsonValue */
    const state = record.state as unknown as GameState;

    if (!state.transcendence) {
      return context.json({ error: "No transcendence data found" }, 400);
    }

    const { purchasedUpgradeIds, echoes } = state.transcendence;

    if (purchasedUpgradeIds.includes(upgradeId)) {
      return context.json({ error: "Upgrade already purchased" }, 400);
    }

    if (echoes < upgrade.cost) {
      return context.json({ error: "Not enough echoes" }, 400);
    }

    const updatedEchoes = echoes - upgrade.cost;
    const updatedPurchasedIds = [ ...purchasedUpgradeIds, upgradeId ];
    const updatedMultipliers
      = computeTranscendenceMultipliers(updatedPurchasedIds);

    const updatedState: GameState = {
      ...state,
      transcendence: {
        ...state.transcendence,
        echoes:              updatedEchoes,
        purchasedUpgradeIds: updatedPurchasedIds,
        ...updatedMultipliers,
      },
    };

    await prisma.gameState.update({
      /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Prisma requires object */
      data:  { state: updatedState as object, updatedAt: Date.now() },
      where: { discordId },
    });

    void logger.metric("transcendence_upgrade_purchased", 1, {
      discordId,
      upgradeId,
    });
    return context.json({
      echoesRemaining:     updatedEchoes,
      purchasedUpgradeIds: updatedPurchasedIds,
      ...updatedMultipliers,
    });
  } catch (error) {
    void logger.error(
      "transcendence_buy_upgrade",
      error instanceof Error
        ? error
        : new Error(String(error)),
    );
    return context.json({ error: "Internal server error" }, 500);
  }
});

export { transcendenceRouter };