import Phaser from 'phaser';
import firstBattleMapUrl from '../../assets/images/battle/first-battle-map.png';
import guanYuPortraitUrl from '../../assets/images/portraits/guan-yu.png';
import liuBeiPortraitUrl from '../../assets/images/portraits/liu-bei.png';
import zhangFeiPortraitUrl from '../../assets/images/portraits/zhang-fei.png';
import storyChaosUrl from '../../assets/images/story/01-yellow-turban-chaos.png';
import storyLiuBeiUrl from '../../assets/images/story/02-liu-bei-resolve.png';
import storyThreeHeroesUrl from '../../assets/images/story/03-three-heroes-meet.png';
import storyMilitiaUrl from '../../assets/images/story/04-volunteer-militia.png';
import storySortieUrl from '../../assets/images/story/05-first-sortie.png';
import titleBackgroundUrl from '../../assets/images/taoyuan-oath-title.png';
import guanYuUnitSheetUrl from '../../assets/images/units/unit-guan-yu.png';
import liuBeiUnitSheetUrl from '../../assets/images/units/unit-liu-bei.png';
import rebelArcherUnitSheetUrl from '../../assets/images/units/unit-rebel-archer.png';
import rebelCavalryUnitSheetUrl from '../../assets/images/units/unit-rebel-cavalry.png';
import rebelLeaderUnitSheetUrl from '../../assets/images/units/unit-rebel-leader.png';
import rebelUnitSheetUrl from '../../assets/images/units/unit-rebel.png';
import zhangFeiUnitSheetUrl from '../../assets/images/units/unit-zhang-fei.png';

type UnitDirection = 'south' | 'east' | 'north' | 'west';

const unitWalkFrameCount = 4;
const unitSheetFrameSize = 313;
const unitWalkFrameRate = 8;
const unitIdleFrameRate = 4;
const unitSheetRows: Record<UnitDirection, number> = {
  south: 0,
  east: 1,
  north: 2,
  west: 3
};

const unitSheets = [
  { key: 'unit-liu-bei', url: liuBeiUnitSheetUrl },
  { key: 'unit-guan-yu', url: guanYuUnitSheetUrl },
  { key: 'unit-zhang-fei', url: zhangFeiUnitSheetUrl },
  { key: 'unit-rebel', url: rebelUnitSheetUrl },
  { key: 'unit-rebel-archer', url: rebelArcherUnitSheetUrl },
  { key: 'unit-rebel-cavalry', url: rebelCavalryUnitSheetUrl },
  { key: 'unit-rebel-leader', url: rebelLeaderUnitSheetUrl }
];

export class BootScene extends Phaser.Scene {
  constructor() {
    super('BootScene');
  }

  preload() {
    this.load.image('title-taoyuan', titleBackgroundUrl);
    this.load.image('story-chaos', storyChaosUrl);
    this.load.image('story-liu-bei', storyLiuBeiUrl);
    this.load.image('story-three-heroes', storyThreeHeroesUrl);
    this.load.image('story-militia', storyMilitiaUrl);
    this.load.image('story-sortie', storySortieUrl);
    this.load.image('battle-map-first', firstBattleMapUrl);
    this.load.image('portrait-liu-bei', liuBeiPortraitUrl);
    this.load.image('portrait-guan-yu', guanYuPortraitUrl);
    this.load.image('portrait-zhang-fei', zhangFeiPortraitUrl);

    unitSheets.forEach(({ key, url }) => {
      this.load.spritesheet(key, url, {
        frameWidth: unitSheetFrameSize,
        frameHeight: unitSheetFrameSize
      });
    });
  }

  create() {
    this.createPetalTexture();
    this.createUnitAnimations();
    this.scene.start('TitleScene');
  }

  private createPetalTexture() {
    const graphics = this.make.graphics({ x: 0, y: 0 });
    graphics.fillStyle(0xf0a6a4, 1);
    graphics.fillEllipse(12, 10, 20, 9);
    graphics.fillStyle(0xf7c7bd, 0.75);
    graphics.fillEllipse(15, 8, 10, 4);
    graphics.generateTexture('petal', 24, 18);
    graphics.destroy();
  }

  private createUnitAnimations() {
    unitSheets.forEach(({ key }) => {
      (['south', 'east', 'north', 'west'] as UnitDirection[]).forEach((direction) => {
        const frames = Array.from({ length: unitWalkFrameCount }, (_, frameIndex) => ({
          key,
          frame: unitSheetRows[direction] * unitWalkFrameCount + frameIndex
        }));
        const walkAnimationKey = `${key}-walk-${direction}`;
        const idleAnimationKey = `${key}-idle-${direction}`;

        if (!this.anims.exists(walkAnimationKey)) {
          this.anims.create({
            key: walkAnimationKey,
            frames,
            frameRate: unitWalkFrameRate,
            repeat: -1
          });
        }

        if (!this.anims.exists(idleAnimationKey)) {
          this.anims.create({
            key: idleAnimationKey,
            frames,
            frameRate: unitIdleFrameRate,
            repeat: -1
          });
        }
      });
    });
  }
}