import type { BuyPrestigeUpgradeRequest, GameState, PrestigeRequest } from "@elysium/types";
import { Hono } from "hono";
import { prisma } from "../db/client.js";
import { authMiddleware } from "../middleware/auth.js";
import { DEFAULT_PRESTIGE_UPGRADES } from "../data/prestigeUpgrades.js";
import { updateChallengeProgress } from "../services/dailyChallenges.js";
import {
  buildPostPrestigeState,
  computeRunestoneMultipliers,
  isEligibleForPrestige,
} from "../services/prestige.js";

export const prestigeRouter = new Hono();

prestigeRouter.use("*", authMiddleware);

prestigeRouter.post("/", async (context) => {
  const discordId = context.get("discordId") as string;
  const body = await context.req.json<PrestigeRequest>();

  const characterName = body.characterName?.trim();
  if (!characterName) {
    return context.json({ error: "characterName is required" }, 400);
  }

  const record = await prisma.gameState.findUnique({ where: { discordId } });

  if (!record) {
    return context.json({ error: "No save found" }, 404);
  }

  const state = record.state as unknown as GameState;

  if (!isEligibleForPrestige(state)) {
    return context.json(
      { error: "Not eligible for prestige — collect 1,000,000 total gold first" },
      400,
    );
  }

  // Update daily prestige challenge progress before resetting the run
  let updatedDailyChallenges = state.dailyChallenges;
  let challengeCrystals = 0;
  if (updatedDailyChallenges) {
    const result = updateChallengeProgress(updatedDailyChallenges, "prestige", 1);
    updatedDailyChallenges = result.updatedChallenges;
    challengeCrystals = result.crystalsAwarded;
  }

  const { newState, newPrestigeData, runestonesEarned, milestoneRunestones } = buildPostPrestigeState(
    state,
    characterName,
  );

  // Preserve daily challenges across the prestige reset and apply any crystal rewards
  const finalState: GameState = {
    ...newState,
    dailyChallenges: updatedDailyChallenges,
    resources: {
      ...newState.resources,
      crystals: newState.resources.crystals + challengeCrystals,
    },
  };

  const now = Date.now();
  await prisma.gameState.update({
    where: { discordId },
    data: { state: finalState as object, updatedAt: now },
  });

  await prisma.player.update({
    where: { discordId },
    data: {
      characterName,
      totalGoldEarned: 0,
      totalClicks: 0,
      lastSavedAt: now,
    },
  });

  return context.json({
    runestones: runestonesEarned,
    newPrestigeCount: newPrestigeData.count,
    milestoneRunestones,
  });
});

prestigeRouter.post("/buy-upgrade", async (context) => {
  const discordId = context.get("discordId") as string;
  const body = await context.req.json<BuyPrestigeUpgradeRequest>();

  const { upgradeId } = body;
  if (!upgradeId) {
    return context.json({ error: "upgradeId is required" }, 400);
  }

  const upgrade = DEFAULT_PRESTIGE_UPGRADES.find((u) => u.id === upgradeId);
  if (!upgrade) {
    return context.json({ error: "Unknown prestige upgrade" }, 404);
  }

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

  const state = record.state as unknown as GameState;
  const { purchasedUpgradeIds, runestones } = state.prestige;

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

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

  const newRunestones = runestones - upgrade.runestonesCost;
  const newPurchasedUpgradeIds = [...purchasedUpgradeIds, upgradeId];

  const newState: GameState = {
    ...state,
    prestige: {
      ...state.prestige,
      runestones: newRunestones,
      purchasedUpgradeIds: newPurchasedUpgradeIds,
      ...computeRunestoneMultipliers(newPurchasedUpgradeIds),
    },
  };

  await prisma.gameState.update({
    where: { discordId },
    data: { state: newState as object, updatedAt: Date.now() },
  });

  const multipliers = computeRunestoneMultipliers(newPurchasedUpgradeIds);

  return context.json({
    runestonesRemaining: newRunestones,
    purchasedUpgradeIds: newPurchasedUpgradeIds,
    ...multipliers,
  });
});