const DB = {
  allMonsters: [],
  allAnimations: {},
  monsters: {},
  shapes: {},
  elements: {},
  techniques: {},
};

const ElementType = {
  aether: 'aether',
  wood: 'wood',
  fire: 'fire',
  earth: 'earth',
  metal: 'metal',
  water: 'water',
};
const ElementTypeColor = {
  [ElementType.aether]: 'rgba(255, 255, 255, 1)',
  [ElementType.wood]: '#3ca6a6',
  [ElementType.fire]: '#ca3c3c',
  [ElementType.earth]: '#eac93c',
  [ElementType.metal]: '#e4e4e4',
  [ElementType.water]: '#3c3c3c',
};
const TasteWarm = {
  tasteless: 'tasteless',
  peppy: 'peppy',
  salty: 'salty',
  hearty: 'hearty',
  zesty: 'zesty',
  refined: 'refined',
};
const TasteCold = {
  tasteless: 'tasteless',
  mild: 'mild',
  sweet: 'sweet',
  soft: 'soft',
  flakey: 'flakey',
  dry: 'dry',
};
const TechniqueRange = {
  melee: 'melee',
  touch: 'touch',
  ranged: 'ranged',
  reach: 'reach',
  reliable: 'reliable',
};
const StatusType = {
  melee: 'melee',
  armour: 'armour',
  ranged: 'ranged',
  dodge: 'dodge',
  speed: 'speed',
};

class State {
  money = 0;
  monsters = [];

  partyMonsters = [];
  activeMonster = null;
  activeTechnique = null;

  enemy = {
    monster: null,
  };
};

class Monster {
  #level = 1;
  exp = 1;
  hp = 0;

  tasteWarm = TasteWarm.tasteless;
  tasteCold = TasteCold.tasteless;

  gender = '';

  statusModifiers = {
    hp: 0,
    melee: 0,
    armour: 0,
    ranged: 0,
    dodge: 0,
    speed: 0,
  };

  experienceModifier = 1;
  moneyModifier = 1;

  constructor (slug) {
    this.slug = slug;

    const tasteWarm = Object.keys(TasteWarm).slice(1);
    this.tasteWarm = tasteWarm[Math.floor(Math.random() * tasteWarm.length)];
    const tasteCold = Object.keys(TasteCold).slice(1);
    this.tasteCold = tasteCold[Math.floor(Math.random() * tasteCold.length)];

    this.hp = this.status.hp;

    const possibleGenders = DB.monsters[this.slug].possible_genders;
    this.gender = possibleGenders[Math.floor(Math.random() * possibleGenders.length)]
  }

  get shape () {
    for (const shapeData of DB.shapes) {
      if (shapeData.slug === DB.monsters[this.slug].shape) {
        return shapeData;
      }
    }
  }

  get types () {
    return DB.monsters[this.slug].types;
  }

  get moveset () {
    return DB.monsters[this.slug].moveset;
  }

  get evolutions () {
    return DB.monsters[this.slug].evolutions;
  }

  get level () {
    return this.#level;
  }

  set level (level) {
    const statusPreLevelUp = this.status;
    const hpPreLevelUp = this.hp;

    this.#level = level;

    const statusPostLevelUp = this.status;

    this.hp = statusPostLevelUp.hp - (statusPreLevelUp.hp - hpPreLevelUp);

    if (this.exp < this.getExperienceRequired(-1)) {
      this.exp = this.getExperienceRequired(-1);
    }
  }

  get name () {
    return slugToName(this.slug);
  }

  canLevelUp () {
    return this.exp >= this.getExperienceRequired();
  }

  levelUp () {
    while (this.canLevelUp()) {
      this.level++;
    }
  }

  getExperienceRequired (levelOffset = 0) {
    return Math.max(
      Math.pow(this.level + levelOffset, 3),
      1
    );
  }

  getPossibleEvolutions () {
    return this.evolutions.filter((evolution) => this.level >= evolution.at_level && (!evolution.item || this.heldItem === evolution.item));
  }

  canEvolve () {
    return this.getPossibleEvolutions().length > 0;
  }

  evolve () {
    const evolution = this.getPossibleEvolutions()[0];

    const statusPreEvolve = this.status;
    const hpPreEvolve = this.hp;

    this.slug = evolution.monster_slug;

    const statusPostEvolve = this.status;

    this.hp = statusPostEvolve.hp - (statusPreEvolve.hp - hpPreEvolve);
  }

  getTasteStatusModifier (statusName, baseStatus) {
    let positive = 0;
    let negative = 0;

    let isPositive = false;
    let isNegative = false;
    if (statusName === 'melee') {
      isPositive = this.tasteWarm === TasteWarm.salty;
      isNegative = this.tasteCold === TasteCold.sweet;
    }
    else if (statusName === 'armour') {
      isPositive = this.tasteWarm === TasteWarm.hearty;
      isNegative = this.tasteCold === TasteCold.soft;
    }
    else if (statusName === 'ranged') {
      isPositive = this.tasteWarm === TasteWarm.zesty;
      isNegative = this.tasteCold === TasteCold.flakey;
    }
    else if (statusName === 'dodge') {
      isPositive = this.tasteWarm === TasteWarm.refined;
      isNegative = this.tasteCold === TasteCold.dry;
    }
    else if (statusName === 'speed') {
      isPositive = this.tasteWarm === TasteWarm.peppy;
      isNegative = this.tasteCold === TasteCold.mild;
    }

    if (isPositive) {
      positive = baseStatus * 10 / 100;
    }
    if (isNegative) {
      negative = baseStatus * 10 / 100;
    }

    return Math.floor(positive) - Math.floor(negative);
  }

  get status () {
    const multiplier = this.level + 7;
    let hp = (this.shape.hp * multiplier) + this.statusModifiers.hp;
    let melee = (this.shape.melee * multiplier) + this.statusModifiers.melee;
    let armour = (this.shape.armour * multiplier) + this.statusModifiers.armour;
    let ranged = (this.shape.ranged * multiplier) + this.statusModifiers.ranged;
    let dodge = (this.shape.dodge * multiplier) + this.statusModifiers.dodge;
    let speed = (this.shape.speed * multiplier) + this.statusModifiers.speed;

    // Tastes
    melee += this.getTasteStatusModifier('melee', melee);
    armour += this.getTasteStatusModifier('armour', melee);
    ranged += this.getTasteStatusModifier('ranged', melee);
    dodge += this.getTasteStatusModifier('dodge', melee);
    speed += this.getTasteStatusModifier('speed', melee);

    return {
      hp,
      melee,
      armour,
      ranged,
      dodge,
      speed,
    };
  }
};

class Technique {
  constructor (slug) {
    this.slug = slug;
  }

  get types () {
    return DB.techniques[this.slug].types;
  }

  get power () {
    return DB.techniques[this.slug].power;
  }

  get range () {
    return DB.techniques[this.slug].range;
  }

  get animation () {
    return DB.techniques[this.slug].animation;
  }
}

function simpleDamageMultiplier (techniqueTypes, targetTypes) {
  let multiplier = 1;

  for (const techniqueType of techniqueTypes) {
    if (techniqueType === ElementType.aether) {
      continue;
    }

    for (const targetType of targetTypes) {
      if (targetType === ElementType.aether) {
        continue;
      }

      multiplier *= DB.elements[techniqueType].types.find((type) => type.against === targetType).multiplier;
    }
  }

  return Math.max(0.25, Math.min(multiplier, 4));
}
function simpleDamageCalculation (technique, user, target) {
  let userBaseStrength = user.level + 7;
  let userStrength = 1;
  let targetResist = 1;

  if (technique.range === TechniqueRange.melee) {
    userStrength = userBaseStrength * user.status.melee;
    targetResist = target.status.armour;
  }
  else if (technique.range === TechniqueRange.touch) {
    userStrength = userBaseStrength * user.status.melee;
    targetResist = target.status.dodge;
  }
  else if (technique.range === TechniqueRange.ranged) {
    userStrength = userBaseStrength * user.status.ranged;
    targetResist = target.status.dodge;
  }
  else if (technique.range === TechniqueRange.reach) {
    userStrength = userBaseStrength * user.status.ranged;
    targetResist = target.status.armour;
  }
  else if (technique.range === TechniqueRange.reliable) {
    userStrength = userBaseStrength;
    targetResist = 1;
  }

  const multiplier = simpleDamageMultiplier(technique.types, target.types);
  const moveStrength = technique.power * multiplier;
  const damage = Math.floor((userStrength * moveStrength) / targetResist);

  return damage;
}

function calculateAwardedExperience (playerMonster, enemyMonster) {
  return Math.max(
    Math.floor(
      enemyMonster.getExperienceRequired(-1) / enemyMonster.level * enemyMonster.experienceModifier / playerMonster.level
    ),
    1
  );
}

async function fetchMonster (slug) {
  if (! DB.monsters[slug]) {
    DB.monsters[slug] = await fetch(`/modules/tuxemon/mods/tuxemon/db/monster/${slug}.json`).then((response) => response.json());
  }

  return new Monster(slug);
}
async function fetchTechnique (slug) {
  if (! DB.techniques[slug]) {
    DB.techniques[slug] = await fetch(`/modules/tuxemon/mods/tuxemon/db/technique/${slug}.json`).then((response) => response.json());
  }

  return new Technique(slug);
}

function standardizeColor (color) {
  var ctx = document.createElement('canvas').getContext('2d');
  ctx.fillStyle = color;

  return ctx.fillStyle;
}
function mixColors(...colors) {
  let r = 0;
  let g = 0;
  let b = 0;

  for (const color of colors) {
    const [cr, cg, cb] = color.match(/\w\w/g).map((c) => parseInt(c, 16));

    r += cr;
    g += cg;
    b += cb;
  }

  r = r / colors.length;
  g = g / colors.length;
  b = b / colors.length;

  return `rgb(${r}, ${g}, ${b})`;
}

function slugToName (slug) {
  return slug.split('_').map((item) => item.charAt(0).toUpperCase() + item.slice(1)).join(' ');
}

(async function () {
  DB.allMonsters = await fetch('/db/all-monsters.json').then((response) => response.json());
  DB.allAnimations = await fetch('/db/animations.json').then((response) => response.json());
  DB.shapes = await fetch('/modules/tuxemon/mods/tuxemon/db/shape/shapes.json').then((response) => response.json());
  for (const element of Object.keys(ElementType)) {
    DB.elements[element] = await fetch(`/modules/tuxemon/mods/tuxemon/db/element/${element}.json`).then((response) => response.json());
  }

  const state = new State();
  state.enemy.monster = await fetchMonster('grintot');

  state.partyMonsters = [
    await fetchMonster('corvix'),
    await fetchMonster('lunight'),
    await fetchMonster('prophetoise'),
    await fetchMonster('drashimi'),
  ];
  state.activeMonster = state.partyMonsters[0];
  state.activeTechnique = await fetchTechnique(state.activeMonster.moveset[0].technique);

  const templatePartyMonster = document.querySelector('#tpl___party__monster').innerHTML;
  const templateBattleMonster = document.querySelector('#tpl___battle__monster').innerHTML;
  const templatePopup = document.querySelector('#tpl___popup').innerHTML;
  const templateMovesetList = document.querySelector('#tpl___moveset__list').innerHTML;
  const templateMovesetItem = document.querySelector('#tpl___moveset__item').innerHTML;

  const party = document.querySelector('#party');
  const money = document.querySelector('#money');

  const battle = document.querySelector('#battle');
  const battleEnemy = document.querySelector('#battle__enemy');
  const battlePlayer = document.querySelector('#battle__player');

  const UI = {
    activeMonster: null,

    damageAnimationInterval: null,
    damageAnimationNumber: 0,

    getTemplate (template) {
      var tpl = document.createElement('div');
      tpl.innerHTML = template.trim();

      return tpl.firstChild;
    },

    setExp (monster, parentNode) {
      const expBar = parentNode.querySelector('.exp-bar');
      const expText = parentNode.querySelector('.exp-text');

      const expToNextLevel = monster.getExperienceRequired() - monster.getExperienceRequired(-1);
      const currentExp = monster.exp - monster.getExperienceRequired(-1);
      expBar.style.width = (currentExp / expToNextLevel) * 100 + '%';
      expText.textContent = monster.exp + ' / ' + monster.getExperienceRequired();
    },

    setHp (monster, parentNode) {
      const hpBar = parentNode.querySelector('.hp-bar');
      const hpText = parentNode.querySelector('.hp-text');

      const percentHp = (monster.hp / monster.status.hp) * 100;
      if (percentHp > 60) {
        hpBar.style.backgroundColor = 'green';
      } else if (percentHp > 15) {
        hpBar.style.backgroundColor = 'rgb(240, 240, 100)';
      } else {
        hpBar.style.backgroundColor = 'red';
      }

      hpBar.style.width = percentHp + '%';
      hpText.textContent = monster.hp + ' / ' + monster.status.hp;
    },

    createDamage (event, damage) {
      const damageNode = document.createElement('div');
      damageNode.classList.add('damage');
      damageNode.textContent = damage;

      const damageMultiplier = simpleDamageMultiplier(state.activeTechnique.types, state.enemy.monster.types);
      damageNode.style.fontSize = damageMultiplier + 'rem';

      damageNode.style.top = event.pageY - battleEnemy.offsetTop + (Math.random() * 40 - 20);
      damageNode.style.left = event.pageX - battleEnemy.offsetLeft + (Math.random() * 40 - 20);

      damageNode.style.color = mixColors(...state.activeTechnique.types.map((type) => standardizeColor(ElementTypeColor[type])));

      const damageNodeDuration = 2;
      damageNode.style.animationDuration = damageNodeDuration + 's';

      battleEnemy.appendChild(damageNode);
      setTimeout(() => damageNode.remove(), (damageNodeDuration * 1000) - 500);

      const enemyImg = battleEnemy.querySelector('.battle__monster-img');
      const imgClickDuration = 0.1;
      enemyImg.style.transitionDuration = imgClickDuration + 's';
      enemyImg.classList.add('damaged');
      clearTimeout(clickTimeout);
      clickTimeout = setTimeout(() => enemyImg.classList.remove('damaged'), imgClickDuration * 1000);

      var enemyAnimation = battleEnemy.querySelector('.battle__monster-sprite__animation');
      // enemyAnimation.style.top = enemyImg.getBoundingClientRect().top;
      // enemyAnimation.style.left = enemyImg.getBoundingClientRect().left;
      if (!this.damageAnimationInterval && state.activeTechnique.animation) {
        this.damageAnimationInterval = setInterval(() => {
          enemyAnimation.src = `/modules/tuxemon/mods/tuxemon/animations/technique/${state.activeTechnique.animation}_${("00" + this.damageAnimationNumber).slice(-2)}.png`;
          enemyAnimation.style.top = event.clientY - (enemyAnimation.clientHeight / 2);
          enemyAnimation.style.left = event.clientX - (enemyAnimation.clientWidth / 2);
          console.log(enemyAnimation.src);

          this.damageAnimationNumber++;

          if (this.damageAnimationNumber === DB.allAnimations[state.activeTechnique.animation].length) {
            clearInterval(this.damageAnimationInterval);
            this.damageAnimationInterval = null;
            this.damageAnimationNumber = 0;
            enemyAnimation.src = '';
          }
        }, 50);
      }
    },

    addPartyMonster (slug) {
      let partyMonster = document.createElement('div');
      partyMonster.innerHTML = templatePartyMonster.trim();
      partyMonster = partyMonster.firstChild;

      partyMonster.dataset.slug = slug;
      partyMonster.querySelector('img').src = `/modules/tuxemon/mods/tuxemon/gfx/sprites/battle/${slug}-front.png`;

      partyMonster.addEventListener('click', (event) => {
        let target = event.target;
        while (target.parentNode.id !== 'party') {
          target = target.parentNode;
        }

        state.activeMonster = state.partyMonsters[Array.prototype.indexOf.call(document.querySelector('#party').children, target)];
        UI.setActiveMonster();
      });
      partyMonster.style.cursor = 'pointer';

      party.appendChild(partyMonster);
    },

    async setActiveMonster () {
      let activeMoveIndex = 0;
      while ((await fetchTechnique(state.activeMonster.moveset[activeMoveIndex].technique)).power === 0) {
        activeMoveIndex++;
      }
      state.activeTechnique = await fetchTechnique(state.activeMonster.moveset[activeMoveIndex].technique);

      UI.setBattleMonster(state.activeMonster, 'player');
    },

    setBattleMonster (monster, where) {
      let battleMonster = document.createElement('div');
      battleMonster.innerHTML = templateBattleMonster.trim();
      battleMonster = battleMonster.firstChild;

      battleMonster.querySelector('.battle__monster-info__name').textContent = monster.name;
      battleMonster.querySelector('.battle__monster-info__gender').textContent = monster.gender === 'male' ? '♂' : monster.gender === 'female' ? '♀' : '⚲';
      battleMonster.querySelector('.battle__monster-info__level').textContent = monster.level;
      UI.setHp(monster, battleMonster.querySelector('.hp'));
      battleMonster.querySelector('img').src = `/modules/tuxemon/mods/tuxemon/gfx/sprites/battle/${monster.slug}-front.png`;

      if (where === 'player') {
        UI.setExp(monster, battleMonster.querySelector('.exp'));
        battleMonster.querySelector('.battle__monster-technique').textContent =
          state.activeTechnique.slug + ' - ' + state.activeTechnique.types + ' - ' + state.activeTechnique.power;
        battleMonster.querySelector('.battle__monster-technique').addEventListener('click', UI.openMovesetSelection);

        battleMonster.classList.add('battle__monster--player');
        battlePlayer.replaceChildren(battleMonster);
      } else {
        battleMonster.classList.add('battle__monster--enemy');
        // battleEnemy.replaceChildren(battleMonster);
        battleEnemy.querySelector('.battle__monster') && battleEnemy.removeChild(battleEnemy.querySelector('.battle__monster'));
        battleEnemy.appendChild(battleMonster);
      }
    },

    async openMovesetSelection () {
      const popup = UI.getTemplate(templatePopup);
      popup.addEventListener('click', ({ target }) => target === popup && popup.remove());

      const movesetList = UI.getTemplate(templateMovesetList);
      for (const move of state.activeMonster.moveset) {
        const technique = await fetchTechnique(move.technique);

        if (technique.power === 0) {
          continue;
        }

        const movesetItem = UI.getTemplate(templateMovesetItem);

        movesetItem.textContent = slugToName(technique.slug) + ' - ' + technique.types + ' - ' + technique.power + ' - ' + move.level_learned;
        movesetItem.addEventListener('click', () => {
          if (movesetItem.getAttribute('disabled')) {
            return false;
          }

          state.activeTechnique = technique;
          UI.setBattleMonster(state.activeMonster, 'player');

          popup.remove();
        });

        if (state.activeMonster.level < move.level_learned) {
          movesetItem.setAttribute('disabled', true);
        }

        movesetList.appendChild(movesetItem);
      }

      popup.querySelector('.popup').appendChild(movesetList);
      document.body.appendChild(popup);
    },

    async createNewEnemyMonster () {
      state.enemy.monster = await fetchMonster(DB.allMonsters[Math.floor(Math.random() * DB.allMonsters.length)]);
      state.enemy.monster.level = Math.ceil(Math.random() * state.activeMonster.level);
      // state.enemy.monster.experienceModifier = state.enemy.monster.level;
      state.enemy.monster.moneyModifier = state.enemy.monster.level;
      UI.setBattleMonster(state.enemy.monster, 'enemy');
    },
  };

  for (const monster of state.partyMonsters) {
    UI.addPartyMonster(monster.slug);
  }

  UI.setBattleMonster(state.activeMonster, 'player');
  UI.setBattleMonster(state.enemy.monster, 'enemy');
  UI.setActiveMonster();

  var clickTimeout;
  document.querySelector('#battle__enemy').addEventListener('click', async (event) => {
    const damage = simpleDamageCalculation(state.activeTechnique, state.activeMonster, state.enemy.monster);
    UI.createDamage(event, damage);

    state.enemy.monster.hp -= damage;
    if (state.enemy.monster.hp <= 0) {
      const faintedMonster = state.enemy.monster;

      await UI.createNewEnemyMonster();

      state.money += faintedMonster.level * faintedMonster.moneyModifier;

      state.activeMonster.exp += calculateAwardedExperience(state.activeMonster, faintedMonster);
      state.activeMonster.levelUp();
      if (state.activeMonster.canEvolve()) {
        await fetchMonster(state.activeMonster.evolutions[0].monster_slug);
        state.activeMonster.evolve();
        UI.setActiveMonster();
      }

      UI.setBattleMonster(state.activeMonster, 'player');
    }
    UI.setHp(state.enemy.monster, battleEnemy);
    money.textContent = state.money;
  });

  document.querySelector('#catch').addEventListener('click', async (event) => {
    const caughtMonster = new Monster(state.enemy.monster.slug);
    caughtMonster.level = state.enemy.monster.level;

    state.partyMonsters.push(caughtMonster);

    UI.createNewEnemyMonster();
    UI.addPartyMonster(caughtMonster.slug);
  });
})();