/**
 * @file Consecration service handling eligibility checks and post-consecration state building.
 * @copyright nhcarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */
/* eslint-disable max-lines-per-function -- Function requires many steps */
/* eslint-disable stylistic/max-len -- Service logic requires long lines */
import { defaultConsecrationUpgrades } from "../data/goddessConsecrationUpgrades.js";
import { initialGoddessState } from "../data/initialState.js";
import type { ConsecrationData, GameState } from "@elysium/types";

/**
 * Base prayers threshold for the first consecration.
 */
const baseConsecrationThreshold = 50_000;

/**
 * Divisor used in the divinity yield formula.
 */
const divinityYieldDivisor = 1000;

/**
 * Calculates the prayers threshold required for the next consecration.
 * Formula: BASE * (count + 1)^2 * thresholdMultiplier.
 * @param consecrationCount - The number of consecrations completed so far.
 * @param thresholdMultiplier - An optional stardust-upgrade multiplier applied to the threshold.
 * @returns The prayers amount required to consecrate.
 */
const calculateConsecrationThreshold = (
  consecrationCount: number,
  thresholdMultiplier = 1,
): number => {
  return (
    baseConsecrationThreshold
    * Math.pow(consecrationCount + 1, 2)
    * thresholdMultiplier
  );
};

/**
 * Returns true if the player is eligible to consecrate:
 * the total prayers earned in the current run must meet the threshold.
 * @param state - The current game state.
 * @returns Whether the player is eligible for consecration.
 */
const isEligibleForConsecration = (state: GameState): boolean => {
  // eslint-disable-next-line capitalized-comments -- v8 ignore
  /* v8 ignore next 3 -- @preserve */
  if (state.goddess === undefined) {
    return false;
  }
  const thresholdMultiplier
    = state.goddess.enlightenment.stardustConsecrationThresholdMultiplier;
  const threshold = calculateConsecrationThreshold(
    state.goddess.consecration.count,
    thresholdMultiplier,
  );
  return state.goddess.totalPrayersEarned >= threshold;
};

/**
 * Calculates the divinity yield from a consecration.
 * Formula: MAX(1, FLOOR(SQRT(totalPrayersEarned / divisor) * divinityMultiplier)).
 * @param totalPrayersEarned - Total prayers earned in the current consecration run.
 * @param divinityMultiplier - Multiplier from stardust upgrades applied to divinity yield.
 * @returns The divinity earned.
 */
const calculateDivinityYield = (
  totalPrayersEarned: number,
  divinityMultiplier: number,
): number => {
  return Math.max(
    1,
    Math.floor(
      Math.sqrt(totalPrayersEarned / divinityYieldDivisor) * divinityMultiplier,
    ),
  );
};

/**
 * Computes the consecration production multiplier from the count.
 * Each consecration adds 25% to the production multiplier.
 * @param count - The number of consecrations completed.
 * @returns The computed production multiplier as a number.
 */
const computeConsecrationProductionMultiplier = (count: number): number => {
  const bonus = count * 0.25;
  return 1 + bonus;
};

const getCategoryMultiplier = (
  purchasedUpgradeIds: Array<string>,
  category: string,
): number => {
  return defaultConsecrationUpgrades.filter((upgrade) => {
    return (
      upgrade.category === category
      && purchasedUpgradeIds.includes(upgrade.id)
    );
  }).reduce((mult, upgrade) => {
    return mult * upgrade.multiplier;
  }, 1);
};

/**
 * Computes all three divinity-upgrade multipliers from the purchased upgrade IDs.
 * @param purchasedUpgradeIds - The array of purchased consecration upgrade IDs.
 * @returns An object containing the three divinity multiplier values.
 */
const computeConsecrationDivinityMultipliers = (
  purchasedUpgradeIds: Array<string>,
): Pick<
  ConsecrationData,
  | "divinityCombatMultiplier"
  | "divinityDisciplesMultiplier"
  | "divinityPrayersMultiplier"
> => {
  return {
    divinityCombatMultiplier:    getCategoryMultiplier(purchasedUpgradeIds, "combat"),
    divinityDisciplesMultiplier: getCategoryMultiplier(purchasedUpgradeIds, "disciples"),
    divinityPrayersMultiplier:   getCategoryMultiplier(purchasedUpgradeIds, "prayers"),
  };
};

/**
 * Builds the updated goddess state after a consecration reset.
 * Resets the current run (bosses, quests, disciples, upgrades, zones, exploration crafting).
 * Preserves: equipment, achievements, consecration data (updated), enlightenment, lifetime stats, sacred materials.
 * @param state - The current game state before consecration.
 * @returns The divinity earned and the updated goddess state.
 */
const buildPostConsecrationState = (
  state: GameState,
): { divinityEarned: number; updatedGoddess: NonNullable<GameState["goddess"]> } => {
  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Caller must ensure goddess exists
  const goddess = state.goddess as NonNullable<GameState["goddess"]>;

  const divinityMultiplier
    = goddess.enlightenment.stardustConsecrationDivinityMultiplier;
  const divinityEarned = calculateDivinityYield(
    goddess.totalPrayersEarned,
    divinityMultiplier,
  );

  const updatedCount = goddess.consecration.count + 1;
  const updatedDivinity = goddess.consecration.divinity + divinityEarned;
  const productionMultiplier = computeConsecrationProductionMultiplier(updatedCount);

  const updatedConsecration: ConsecrationData = {
    ...goddess.consecration,
    count:                updatedCount,
    divinity:             updatedDivinity,
    lastConsecratedAt:    Date.now(),
    productionMultiplier: productionMultiplier,
    ...computeConsecrationDivinityMultipliers(
      goddess.consecration.purchasedUpgradeIds,
    ),
  };

  const freshGoddess = initialGoddessState();

  const updatedGoddess: NonNullable<GameState["goddess"]> = {
    ...freshGoddess,
    achievements: goddess.achievements,
    bosses:       freshGoddess.bosses.map((b) => {
      // eslint-disable-next-line capitalized-comments -- v8 ignore
      /* v8 ignore next 7 -- @preserve */
      const existing = goddess.bosses.find((gb) => {
        return gb.id === b.id;
      });
      return {
        ...b,
        bountyDivinityClaimed: existing?.bountyDivinityClaimed ?? false,
      };
    }),
    consecration:  updatedConsecration,
    enlightenment: goddess.enlightenment,
    equipment:     goddess.equipment,
    exploration:   {
      ...freshGoddess.exploration,
      materials: goddess.exploration.materials,
    },
    lastTickAt:              Date.now(),
    lifetimeBossesDefeated:  goddess.lifetimeBossesDefeated,
    lifetimePrayersEarned:   goddess.lifetimePrayersEarned + goddess.totalPrayersEarned,
    lifetimeQuestsCompleted: goddess.lifetimeQuestsCompleted,
    totalPrayersEarned:      0,
  };

  return { divinityEarned, updatedGoddess };
};

export {
  buildPostConsecrationState,
  calculateConsecrationThreshold,
  calculateDivinityYield,
  computeConsecrationDivinityMultipliers,
  computeConsecrationProductionMultiplier,
  isEligibleForConsecration,
};