import { ALL_STATS, Skill, Stat, SuccessorOption, Wish } from "./datatypes.ts";
import { getSkills } from "./skills.ts";
import { getThralls, ItemStage, LifeStage, Thrall } from "./thralls.ts";

export class PlayerProgress {
  #name: string;
  #thrallTemplate: number;
  #nImprovements: number;
  #stats: Record<Stat, number>;
  #talents: Record<Stat, number>;
  #isInPenance: boolean;
  #wish: Wish | null;
  #exp: number;
  #blood: number;
  #itemsPurloined: number;
  #skillsLearned: number[]; // use the raw ID representation for indexOf
  #untrimmedSkillsAvailable: Skill[];
  #thrallsUnlocked: number[];
  #thrallDamage: Record<number, number>;
  #thrallsObtainedItem: number[];
  #thrallsDeliveredItem: number[];

  constructor(asSuccessor: SuccessorOption, withWish: Wish | null) {
    this.#name = asSuccessor.name;
    this.#thrallTemplate = asSuccessor.template.id;
    this.#nImprovements = asSuccessor.nImprovements;
    this.#stats = { ...asSuccessor.stats };
    this.#talents = { ...asSuccessor.talents };
    this.#isInPenance = asSuccessor.inPenance;
    this.#wish = withWish;
    this.#exp = 0;
    this.#blood = 0;
    this.#itemsPurloined = 0;
    this.#skillsLearned = [];
    this.#untrimmedSkillsAvailable = [];
    this.#thrallsUnlocked = [];
    this.#thrallDamage = {};
    this.#thrallsObtainedItem = [];
    this.#thrallsDeliveredItem = [];

    this.refill();
  }

  applyEndOfTurn() {
    for (let stat of ALL_STATS.values()) {
      this.add(stat, this.#talents[stat]);
    }
  }

  get name(): string {
    return this.#name;
  }

  get template(): Thrall {
    return { id: this.#thrallTemplate };
  }

  get nImprovements(): number {
    return this.#nImprovements;
  }

  get isInPenance(): boolean {
    return this.#isInPenance;
  }

  refill() {
    this.#blood = 1000;

    let learnableSkills = []; // TODO: Also include costing info
    for (let skill of getSkills()
      .getAvailableSkills(this.#isInPenance)
      .values()) {
      if (this.#canBeAvailable(skill)) {
        learnableSkills.push(skill);
      }
    }

    for (let thrall of getThralls().getAll()) {
      let stage = this.getThrallLifeStage(thrall);
      if (stage == LifeStage.Vampirized || stage == LifeStage.Dead) {
        continue;
      }
      this.#thrallDamage[thrall.id] = Math.max(
        this.#thrallDamage[thrall.id] ?? 0 - 0.2,
        0.0,
      );
    }

    this.#untrimmedSkillsAvailable = learnableSkills;
  }

  hasLearned(skill: Skill) {
    return this.#skillsLearned.indexOf(skill.id) !== -1;
  }

  learnSkill(skill: Skill) {
    if (this.#skillsLearned.indexOf(skill.id) != -1) {
      return;
    }
    this.#skillsLearned.push(skill.id);

    // remove entries for that skill
    let skills2 = [];
    for (let entry of this.#untrimmedSkillsAvailable.values()) {
      if (entry.id == skill.id) {
        continue;
      }
      skills2.push(entry);
    }
    this.#untrimmedSkillsAvailable = skills2;
  }

  #canBeAvailable(skill: Skill) {
    // make sure we haven't learned this skill already
    if (this.hasLearned(skill)) {
      return false;
    }

    let data = getSkills().get(skill);

    // make sure the prereqs are met
    for (let prereq of data.prereqs.values()) {
      if (!this.hasLearned(prereq)) {
        return false;
      }
    }

    // ok, we're good!!
    return true;
  }

  purloinItem() {
    this.#itemsPurloined += 1;
  }

  getItemsPurloined() {
    return this.#itemsPurloined;
  }

  add(stat: Stat, amount: number) {
    if (amount != Math.floor(amount)) {
      throw `stat increment must be integer: ${amount}`;
    }
    this.#stats[stat] += amount;
    this.#stats[stat] = Math.min(Math.max(this.#stats[stat], -99), 999);
  }

  addExperience(amt: number) {
    this.#exp += amt;
  }

  getExperience(): number {
    return this.#exp;
  }

  spendExperience(cost: number) {
    if (this.#exp < cost) {
      throw `can't spend ${cost}`;
    }
    this.#exp -= cost;
  }

  getStat(stat: Stat): number {
    return this.#stats[stat];
  }

  getTalent(stat: Stat): number {
    return this.#talents[stat];
  }

  getBlood(): number {
    return Math.floor(Math.max(this.#blood, 0));
  }

  addBlood(amt: number) {
    this.#blood += amt;
    this.#blood = Math.min(this.#blood, 5000);
  }

  spendBlood(amt: number) {
    this.#blood -= amt;
  }

  getWish(): Wish | null {
    return this.#wish;
  }

  getAvailableSkills(): Skill[] {
    // Sort by cost, then by name, then trim down to first 6
    let skillsAvailable = [...this.#untrimmedSkillsAvailable];
    skillsAvailable.sort((a, b) => {
      let name1 = getSkills().get(a).profile.name;
      let name2 = getSkills().get(b).profile.name;

      if (name1 < name2) {
        return -1;
      }
      if (name1 > name2) {
        return 1;
      }
      return 0;
    });
    skillsAvailable.sort((a, b) => {
      return getSkills().computeCost(a) - getSkills().computeCost(b);
    });
    return skillsAvailable.slice(0, 6);
  }

  getUntrimmedAvailableSkillIds(): number[] {
    return this.#untrimmedSkillsAvailable.map((s) => s.id);
  }

  getLearnedSkills() : Skill[] {
    let learnedSkills = [];
    for (let s of this.#skillsLearned.values()) {
      learnedSkills.push({ id: s });
    }
    return learnedSkills;
  }

  getRawLearnedSkills() : number[] {
    return [...this.#skillsLearned];
  }

  getStats() {
    return { ...this.#stats };
  }
  getTalents() {
    return { ...this.#talents };
  }

  unlockThrall(thrall: Thrall) {
    let { id } = thrall;
    if (this.#thrallsUnlocked.indexOf(id) != -1) {
      return;
    }
    this.#thrallsUnlocked.push(id);
  }

  isThrallUnlocked(thrall: Thrall) {
    return this.#thrallsUnlocked.indexOf(thrall.id) != -1;
  }

  getUnlockedThrallIds() : number[] {
    return [...this.#thrallsUnlocked];
  }

  damageThrall(thrall: Thrall, amount: number) {
    if (amount <= 0.0) {
      throw new Error(`damage must be some positive amount, not ${amount}`);
    }
    let stage = this.getThrallLifeStage(thrall);

    if (stage == LifeStage.Vampirized) {
      this.#thrallDamage[thrall.id] = 4.0;
    }
    this.#thrallDamage[thrall.id] =
      (this.#thrallDamage[thrall.id] ?? 0.0) + amount;
  }

  getThrallDamage(thrall: Thrall): number {
    return this.#thrallDamage[thrall.id] ?? 0.0;
  }

  getThrallLifeStage(thrall: Thrall): LifeStage {
    let damage = this.#thrallDamage[thrall.id] ?? 0;
    if (damage < 0.5) {
      return LifeStage.Fresh;
    }
    if (damage < 1.75) {
      return LifeStage.Average;
    }
    if (damage < 3.0) {
      return LifeStage.Poor;
    }
    if (damage < 4.0) {
      return LifeStage.Vampirized;
    }
    return LifeStage.Dead;
  }

  obtainThrallItem(thrall: Thrall) {
    if (this.#thrallsObtainedItem.indexOf(thrall.id) != -1) {
      return;
    }
    this.#thrallsObtainedItem.push(thrall.id);
  }

  getThrallObtainedItemIds() : number[] {
    return [...this.#thrallsObtainedItem];
  }

  deliverThrallItem(thrall: Thrall) {
    if (this.#thrallsDeliveredItem.indexOf(thrall.id) != -1) {
      return;
    }
    this.#thrallsDeliveredItem.push(thrall.id);
  }

  getThrallDeliveredItemIds() : number[] {
    return [...this.#thrallsDeliveredItem];
  }

  getThrallItemStage(thrall: Thrall): ItemStage {
    if (this.#thrallsDeliveredItem.indexOf(thrall.id) != -1) {
      return ItemStage.Delivered;
    }
    if (this.#thrallsObtainedItem.indexOf(thrall.id) != -1) {
      return ItemStage.Obtained;
    }
    return ItemStage.Untouched;
  }

  anyAffordableSkillsAtMinimum() {
    let skills = this.getAvailableSkills();
    for (let skill of skills.values()) {
      if (getSkills().isAtMinimum(skill)) {
        if (
          getPlayerProgress().getExperience() > getSkills().computeCost(skill)
        ) {
          return true;
        }
      }
    }
    return false;
  }
}

let active: PlayerProgress | null = null;

export function initPlayerProgress(
  asSuccessor: SuccessorOption,
  withWish: Wish | null,
) {
  active = new PlayerProgress(asSuccessor, withWish);
}

export function getPlayerProgress(): PlayerProgress {
  if (active == null) {
    throw new Error(
      `trying to get player progress before it has been initialized`,
    );
  }
  return active;
}