import type { Variant } from "#app/data/variant";
import { Weather } from "#app/data/weather";
import { Abilities } from "#app/enums/abilities";
import * as GameMode from "#app/game-mode";
import type { GameModes } from "#app/game-mode";
import { getGameMode } from "#app/game-mode";
import type { ModifierOverride } from "#app/modifier/modifier-type";
import type { BattleStyle } from "#app/overrides";
import Overrides from "#app/overrides";
import type { Unlockables } from "#app/system/unlockables";
import { Biome } from "#enums/biome";
import { Moves } from "#enums/moves";
import type { MysteryEncounterTier } from "#enums/mystery-encounter-tier";
import type { MysteryEncounterType } from "#enums/mystery-encounter-type";
import { Species } from "#enums/species";
import { StatusEffect } from "#enums/status-effect";
import type { WeatherType } from "#enums/weather-type";
import { vi } from "vitest";
import { GameManagerHelper } from "./gameManagerHelper";

/**
 * Helper to handle overrides in tests
 */
export class OverridesHelper extends GameManagerHelper {
  /** If `true`, removes the starting items from enemies at the start of each test; default `true` */
  public removeEnemyStartingItems: boolean = true;
  /** If `true`, sets the shiny overrides to disable shinies at the start of each test; default `true` */
  public disableShinies: boolean = true;

  /**
   * Override the starting biome
   * @warning Any event listeners that are attached to [NewArenaEvent](events\battle-scene.ts) may need to be handled down the line
   * @param biome the biome to set
   */
  public startingBiome(biome: Biome): this {
    this.game.scene.newArena(biome);
    this.log(`Starting biome set to ${Biome[biome]} (=${biome})!`);
    return this;
  }

  /**
   * Override the starting wave (index)
   * @param wave the wave (index) to set. Classic: `1`-`200`
   * @returns `this`
   */
  public startingWave(wave: number): this {
    vi.spyOn(Overrides, "STARTING_WAVE_OVERRIDE", "get").mockReturnValue(wave);
    this.log(`Starting wave set to ${wave}!`);
    return this;
  }

  /**
   * Override the player (pokemon) starting level
   * @param level the (pokemon) level to set
   * @returns `this`
   */
  public startingLevel(level: Species | number): this {
    vi.spyOn(Overrides, "STARTING_LEVEL_OVERRIDE", "get").mockReturnValue(level);
    this.log(`Player Pokemon starting level set to ${level}!`);
    return this;
  }

  /**
   * Override the XP Multiplier
   * @param value the XP multiplier to set
   * @returns `this`
   */
  public xpMultiplier(value: number): this {
    vi.spyOn(Overrides, "XP_MULTIPLIER_OVERRIDE", "get").mockReturnValue(value);
    this.log(`XP Multiplier set to ${value}!`);
    return this;
  }

  /**
   * Override the wave level cap
   * @param cap the level cap value to set; 0 uses normal level caps and negative values
   * disable it completely
   * @returns `this`
   */
  public levelCap(cap: number): this {
    vi.spyOn(Overrides, "LEVEL_CAP_OVERRIDE", "get").mockReturnValue(cap);
    let capStr: string;
    if (cap > 0) {
      capStr = `Level cap set to ${cap}!`;
    } else if (cap < 0) {
      capStr = "Level cap disabled!";
    } else {
      capStr = "Level cap reset to default value for wave.";
    }
    this.log(capStr);
    return this;
  }

  /**
   * Override the player (pokemon) starting held items
   * @param items the items to hold
   * @returns `this`
   */
  public startingHeldItems(items: ModifierOverride[]): this {
    vi.spyOn(Overrides, "STARTING_HELD_ITEMS_OVERRIDE", "get").mockReturnValue(items);
    this.log("Player Pokemon starting held items set to:", items);
    return this;
  }

  /**
   * Override the player (pokemon) {@linkcode Species | species}
   * @param species the (pokemon) {@linkcode Species | species} to set
   * @returns `this`
   */
  public starterSpecies(species: Species | number): this {
    vi.spyOn(Overrides, "STARTER_SPECIES_OVERRIDE", "get").mockReturnValue(species);
    this.log(`Player Pokemon species set to ${Species[species]} (=${species})!`);
    return this;
  }

  /**
   * Override the player (pokemon) to be a random fusion
   * @returns `this`
   */
  public enableStarterFusion(): this {
    vi.spyOn(Overrides, "STARTER_FUSION_OVERRIDE", "get").mockReturnValue(true);
    this.log("Player Pokemon is a random fusion!");
    return this;
  }

  /**
   * Override the player (pokemon) fusion species
   * @param species the fusion species to set
   * @returns `this`
   */
  public starterFusionSpecies(species: Species | number): this {
    vi.spyOn(Overrides, "STARTER_FUSION_SPECIES_OVERRIDE", "get").mockReturnValue(species);
    this.log(`Player Pokemon fusion species set to ${Species[species]} (=${species})!`);
    return this;
  }

  /**
   * Override the player (pokemons) forms
   * @param forms the (pokemon) forms to set
   * @returns `this`
   */
  public starterForms(forms: Partial<Record<Species, number>>): this {
    vi.spyOn(Overrides, "STARTER_FORM_OVERRIDES", "get").mockReturnValue(forms);
    const formsStr = Object.entries(forms)
      .map(([ speciesId, formIndex ]) => `${Species[speciesId]}=${formIndex}`)
      .join(", ");
    this.log(`Player Pokemon form set to: ${formsStr}!`);
    return this;
  }

  /**
   * Override the player's starting modifiers
   * @param modifiers the modifiers to set
   * @returns `this`
   */
  public startingModifier(modifiers: ModifierOverride[]): this {
    vi.spyOn(Overrides, "STARTING_MODIFIER_OVERRIDE", "get").mockReturnValue(modifiers);
    this.log(`Player starting modifiers set to: ${modifiers}`);
    return this;
  }

  /**
   * Override the player (pokemon) {@linkcode Abilities | ability}.
   * @param ability the (pokemon) {@linkcode Abilities | ability} to set
   * @returns `this`
   */
  public ability(ability: Abilities): this {
    vi.spyOn(Overrides, "ABILITY_OVERRIDE", "get").mockReturnValue(ability);
    this.log(`Player Pokemon ability set to ${Abilities[ability]} (=${ability})!`);
    return this;
  }

  /**
   * Override the player (pokemon) **passive** {@linkcode Abilities | ability}
   * @param passiveAbility the (pokemon) **passive** {@linkcode Abilities | ability} to set
   * @returns `this`
   */
  public passiveAbility(passiveAbility: Abilities): this {
    vi.spyOn(Overrides, "PASSIVE_ABILITY_OVERRIDE", "get").mockReturnValue(passiveAbility);
    this.log(`Player Pokemon PASSIVE ability set to ${Abilities[passiveAbility]} (=${passiveAbility})!`);
    return this;
  }

  /**
   * Forces the status of the player (pokemon) **passive** {@linkcode Abilities | ability}
   * @param hasPassiveAbility forces the passive to be active if `true`, inactive if `false`
   * @returns `this`
   */
  public hasPassiveAbility(hasPassiveAbility: boolean | null): this {
    vi.spyOn(Overrides, "HAS_PASSIVE_ABILITY_OVERRIDE", "get").mockReturnValue(hasPassiveAbility);
    if (hasPassiveAbility === null) {
      this.log("Player Pokemon PASSIVE ability no longer force enabled or disabled!");
    } else {
      this.log(`Player Pokemon PASSIVE ability is force ${hasPassiveAbility ? "enabled" : "disabled"}!`);
    }
    return this;
  }
  /**
   * Override the player (pokemon) {@linkcode Moves | moves}set
   * @param moveset the {@linkcode Moves | moves}set to set
   * @returns `this`
   */
  public moveset(moveset: Moves | Moves[]): this {
    vi.spyOn(Overrides, "MOVESET_OVERRIDE", "get").mockReturnValue(moveset);
    if (!Array.isArray(moveset)) {
      moveset = [ moveset ];
    }
    const movesetStr = moveset.map((moveId) => Moves[moveId]).join(", ");
    this.log(`Player Pokemon moveset set to ${movesetStr} (=[${moveset.join(", ")}])!`);
    return this;
  }

  /**
   * Override the player (pokemon) {@linkcode StatusEffect | status-effect}
   * @param statusEffect the {@linkcode StatusEffect | status-effect} to set
   * @returns
   */
  public statusEffect(statusEffect: StatusEffect): this {
    vi.spyOn(Overrides, "STATUS_OVERRIDE", "get").mockReturnValue(statusEffect);
    this.log(`Player Pokemon status-effect set to ${StatusEffect[statusEffect]} (=${statusEffect})!`);
    return this;
  }

  /**
   * Override each wave to not have standard trainer battles
   * @returns `this`
   */
  public disableTrainerWaves(): this {
    const realFn = getGameMode;
    vi.spyOn(GameMode, "getGameMode").mockImplementation((gameMode: GameModes) => {
      const mode = realFn(gameMode);
      mode.hasTrainers = false;
      return mode;
    });
    this.log("Standard trainer waves are disabled!");
    return this;
  }

  /**
   * Override each wave to not have critical hits
   * @returns `this`
   */
  public disableCrits(): this {
    vi.spyOn(Overrides, "NEVER_CRIT_OVERRIDE", "get").mockReturnValue(true);
    this.log("Critical hits are disabled!");
    return this;
  }

  /**
   * Override the {@linkcode WeatherType | weather (type)}
   * @param type {@linkcode WeatherType | weather type} to set
   * @returns `this`
   */
  public weather(type: WeatherType): this {
    vi.spyOn(Overrides, "WEATHER_OVERRIDE", "get").mockReturnValue(type);
    this.log(`Weather set to ${Weather[type]} (=${type})!`);
    return this;
  }

  /**
   * Override the seed
   * @param seed the seed to set
   * @returns `this`
   */
  public seed(seed: string): this {
    vi.spyOn(this.game.scene, "resetSeed").mockImplementation(() => {
      this.game.scene.waveSeed = seed;
      Phaser.Math.RND.sow([ seed ]);
      this.game.scene.rngCounter = 0;
    });
    this.game.scene.resetSeed();
    this.log(`Seed set to "${seed}"!`);
    return this;
  }

  /**
   * Override the battle type (e.g., single or double).
   * @see {@linkcode Overrides.BATTLE_TYPE_OVERRIDE}
   * @param battleType battle type to set
   * @returns `this`
   */
  public battleType(battleType: BattleStyle | null): this {
    vi.spyOn(Overrides, "BATTLE_TYPE_OVERRIDE", "get").mockReturnValue(battleType);
    this.log(battleType === null ? "Battle type override disabled!" : `Battle type set to ${battleType}!`);
    return this;
  }

  /**
   * Override the enemy (pokemon) {@linkcode Species | species}
   * @param species the (pokemon) {@linkcode Species | species} to set
   * @returns `this`
   */
  public enemySpecies(species: Species | number): this {
    vi.spyOn(Overrides, "OPP_SPECIES_OVERRIDE", "get").mockReturnValue(species);
    this.log(`Enemy Pokemon species set to ${Species[species]} (=${species})!`);
    return this;
  }

  /**
   * Override the enemy (pokemon) to be a random fusion
   * @returns `this`
   */
  public enableEnemyFusion(): this {
    vi.spyOn(Overrides, "OPP_FUSION_OVERRIDE", "get").mockReturnValue(true);
    this.log("Enemy Pokemon is a random fusion!");
    return this;
  }

  /**
   * Override the enemy (pokemon) fusion species
   * @param species the fusion species to set
   * @returns `this`
   */
  public enemyFusionSpecies(species: Species | number): this {
    vi.spyOn(Overrides, "OPP_FUSION_SPECIES_OVERRIDE", "get").mockReturnValue(species);
    this.log(`Enemy Pokemon fusion species set to ${Species[species]} (=${species})!`);
    return this;
  }

  /**
   * Override the enemy (pokemon) {@linkcode Abilities | ability}
   * @param ability the (pokemon) {@linkcode Abilities | ability} to set
   * @returns `this`
   */
  public enemyAbility(ability: Abilities): this {
    vi.spyOn(Overrides, "OPP_ABILITY_OVERRIDE", "get").mockReturnValue(ability);
    this.log(`Enemy Pokemon ability set to ${Abilities[ability]} (=${ability})!`);
    return this;
  }

  /**
   * Override the enemy (pokemon) **passive** {@linkcode Abilities | ability}
   * @param passiveAbility the (pokemon) **passive** {@linkcode Abilities | ability} to set
   * @returns `this`
   */
  public enemyPassiveAbility(passiveAbility: Abilities): this {
    vi.spyOn(Overrides, "OPP_PASSIVE_ABILITY_OVERRIDE", "get").mockReturnValue(passiveAbility);
    this.log(`Enemy Pokemon PASSIVE ability set to ${Abilities[passiveAbility]} (=${passiveAbility})!`);
    return this;
  }

  /**
   * Forces the status of the enemy (pokemon) **passive** {@linkcode Abilities | ability}
   * @param hasPassiveAbility forces the passive to be active if `true`, inactive if `false`
   * @returns `this`
   */
  public enemyHasPassiveAbility(hasPassiveAbility: boolean | null): this {
    vi.spyOn(Overrides, "OPP_HAS_PASSIVE_ABILITY_OVERRIDE", "get").mockReturnValue(hasPassiveAbility);
    if (hasPassiveAbility === null) {
      this.log("Enemy Pokemon PASSIVE ability no longer force enabled or disabled!");
    } else {
      this.log(`Enemy Pokemon PASSIVE ability is force ${hasPassiveAbility ? "enabled" : "disabled"}!`);
    }
    return this;
  }

  /**
   * Override the enemy (pokemon) {@linkcode Moves | moves}set
   * @param moveset the {@linkcode Moves | moves}set to set
   * @returns `this`
   */
  public enemyMoveset(moveset: Moves | Moves[]): this {
    vi.spyOn(Overrides, "OPP_MOVESET_OVERRIDE", "get").mockReturnValue(moveset);
    if (!Array.isArray(moveset)) {
      moveset = [ moveset ];
    }
    const movesetStr = moveset.map((moveId) => Moves[moveId]).join(", ");
    this.log(`Enemy Pokemon moveset set to ${movesetStr} (=[${moveset.join(", ")}])!`);
    return this;
  }

  /**
   * Override the enemy (pokemon) level
   * @param level the level to set
   * @returns `this`
   */
  public enemyLevel(level: number): this {
    vi.spyOn(Overrides, "OPP_LEVEL_OVERRIDE", "get").mockReturnValue(level);
    this.log(`Enemy Pokemon level set to ${level}!`);
    return this;
  }

  /**
   * Override the enemy (pokemon) {@linkcode StatusEffect | status-effect}
   * @param statusEffect the {@linkcode StatusEffect | status-effect} to set
   * @returns
   */
  public enemyStatusEffect(statusEffect: StatusEffect): this {
    vi.spyOn(Overrides, "OPP_STATUS_OVERRIDE", "get").mockReturnValue(statusEffect);
    this.log(`Enemy Pokemon status-effect set to ${StatusEffect[statusEffect]} (=${statusEffect})!`);
    return this;
  }

  /**
   * Override the enemy (pokemon) held items
   * @param items the items to hold
   * @returns `this`
   */
  public enemyHeldItems(items: ModifierOverride[]): this {
    vi.spyOn(Overrides, "OPP_HELD_ITEMS_OVERRIDE", "get").mockReturnValue(items);
    this.log("Enemy Pokemon held items set to:", items);
    return this;
  }

  /**
   * Gives the player access to an Unlockable.
   * @param unlockable The Unlockable(s) to enable.
   * @returns `this`
   */
  public enableUnlockable(unlockable: Unlockables[]): this {
    vi.spyOn(Overrides, "ITEM_UNLOCK_OVERRIDE", "get").mockReturnValue(unlockable);
    this.log("Temporarily unlocked the following content: ", unlockable);
    return this;
  }

  /**
   * Override the items rolled at the end of a battle
   * @param items the items to be rolled
   * @returns `this`
   */
  public itemRewards(items: ModifierOverride[]): this {
    vi.spyOn(Overrides, "ITEM_REWARD_OVERRIDE", "get").mockReturnValue(items);
    this.log("Item rewards set to:", items);
    return this;
  }

  /**
   * Override player shininess
   * @param shininess - `true` or `false` to force the player's pokemon to be shiny or not shiny,
   *   `null` to disable the override and re-enable RNG shinies.
   * @returns `this`
   */
  public shiny(shininess: boolean | null): this {
    vi.spyOn(Overrides, "SHINY_OVERRIDE", "get").mockReturnValue(shininess);
    if (shininess === null) {
      this.log("Disabled player Pokemon shiny override!");
    } else {
      this.log(`Set player Pokemon to be ${shininess ? "" : "not "}shiny!`);
    }
    return this;
  }

  /**
   * Override player shiny variant
   * @param variant - The player's shiny variant.
   * @returns `this`
   */
  public shinyVariant(variant: Variant): this {
    vi.spyOn(Overrides, "VARIANT_OVERRIDE", "get").mockReturnValue(variant);
    this.log(`Set player Pokemon's shiny variant to ${variant}!`);
    return this;
  }

  /**
   * Override enemy shininess
   * @param shininess - `true` or `false` to force the enemy's pokemon to be shiny or not shiny,
   *   `null` to disable the override and re-enable RNG shinies.
   * @param variant - (Optional) The enemy's shiny {@linkcode Variant}.
   */
  enemyShiny(shininess: boolean | null, variant?: Variant): this {
    vi.spyOn(Overrides, "OPP_SHINY_OVERRIDE", "get").mockReturnValue(shininess);
    if (shininess === null) {
      this.log("Disabled enemy Pokemon shiny override!");
    } else {
      this.log(`Set enemy Pokemon to be ${shininess ? "" : "not "}shiny!`);
    }

    if (variant !== undefined) {
      vi.spyOn(Overrides, "OPP_VARIANT_OVERRIDE", "get").mockReturnValue(variant);
      this.log(`Set enemy shiny variant to be ${variant}!`);
    }
    return this;
  }

  /**
   * Override the enemy (Pokemon) to have the given amount of health segments
   * @param healthSegments the number of segments to give
   * - `0` (default): the health segments will be handled like in the game based on wave, level and species
   * - `1`: the Pokemon will not be a boss
   * - `2`+: the Pokemon will be a boss with the given number of health segments
   * @returns `this`
   */
  public enemyHealthSegments(healthSegments: number): this {
    vi.spyOn(Overrides, "OPP_HEALTH_SEGMENTS_OVERRIDE", "get").mockReturnValue(healthSegments);
    this.log("Enemy Pokemon health segments set to:", healthSegments);
    return this;
  }

  /**
   * Override statuses (Paralysis and Freeze) to always or never activate
   * @param activate - `true` to force activation, `false` to force no activation, `null` to disable the override
   * @returns `this`
   */
  public statusActivation(activate: boolean | null): this {
    vi.spyOn(Overrides, "STATUS_ACTIVATION_OVERRIDE", "get").mockReturnValue(activate);
    if (activate !== null) {
      this.log(`Paralysis and Freeze forced to ${activate ? "always" : "never"} activate!`);
    } else {
      this.log("Status activation override disabled!");
    }
    return this;
  }

  /**
   * Override the encounter chance for a mystery encounter.
   * @param percentage the encounter chance in %
   * @returns `this`
   */
  public mysteryEncounterChance(percentage: number): this {
    const maxRate: number = 256; // 100%
    const rate = maxRate * (percentage / 100);
    vi.spyOn(Overrides, "MYSTERY_ENCOUNTER_RATE_OVERRIDE", "get").mockReturnValue(rate);
    this.log(`Mystery encounter chance set to ${percentage}% (=${rate})!`);
    return this;
  }

  /**
   * Override the encounter chance for a mystery encounter.
   * @param tier - The {@linkcode MysteryEncounterTier} to encounter
   * @returns `this`
   */
  public mysteryEncounterTier(tier: MysteryEncounterTier): this {
    vi.spyOn(Overrides, "MYSTERY_ENCOUNTER_TIER_OVERRIDE", "get").mockReturnValue(tier);
    this.log(`Mystery encounter tier set to ${tier}!`);
    return this;
  }

  /**
   * Override the encounter that spawns for the scene
   * @param encounterType - The {@linkcode MysteryEncounterType} of the encounter
   * @returns `this`
   */
  public mysteryEncounter(encounterType: MysteryEncounterType): this {
    vi.spyOn(Overrides, "MYSTERY_ENCOUNTER_OVERRIDE", "get").mockReturnValue(encounterType);
    this.log(`Mystery encounter override set to ${encounterType}!`);
    return this;
  }

  private log(...params: any[]) {
    console.log("Overrides:", ...params);
  }
}