import type Phaser from 'phaser'
import { GameManager } from '../GameManager'
import { TILE_SIZE, HUD_HEIGHT, PATH_WAYPOINTS } from '../constants'

export interface PathPoint {
  x: number
  y: number
}

/** 将格子坐标转换为像素坐标（格子中心） */
function gridToPixel(gx: number, gy: number): PathPoint {
  return {
    x: gx * TILE_SIZE + TILE_SIZE / 2,
    y: gy * TILE_SIZE + TILE_SIZE / 2 + HUD_HEIGHT,
  }
}

/** 将 PATH_WAYPOINTS 扩展为完整转折路径（去重相邻相同点） */
export function buildFullPath(): PathPoint[] {
  const points: PathPoint[] = []
  for (let i = 0; i < PATH_WAYPOINTS.length - 1; i++) {
    const from = gridToPixel(PATH_WAYPOINTS[i].x, PATH_WAYPOINTS[i].y)
    const to = gridToPixel(PATH_WAYPOINTS[i + 1].x, PATH_WAYPOINTS[i + 1].y)
    points.push(from)
    points.push(to)
  }
  return points.filter(
    (p, i, arr) => i === 0 || p.x !== arr[i - 1].x || p.y !== arr[i - 1].y
  )
}

export interface DotEffect {
  damage: number
  duration: number
  timer: number
}

export abstract class EnemyBase {
  protected scene: Phaser.Scene
  public sprite!: Phaser.GameObjects.Graphics
  protected healthBar!: Phaser.GameObjects.Graphics
  protected quoteText!: Phaser.GameObjects.Text

  public maxHp: number
  public hp: number
  public speed: number
  public readonly kpiDamage: number
  public readonly hcReward: number

  protected pathPoints: PathPoint[]
  protected currentPathIndex: number = 0
  protected x: number = 0
  protected y: number = 0

  public isDead: boolean = false
  public isActive: boolean = true

  get pathProgress(): number {
    return this.currentPathIndex
  }
  public dotEffects: DotEffect[] = []
  public slowEffect: number = 0
  public slowTimer: number = 0
  public shieldCount: number = 0

  constructor(
    scene: Phaser.Scene,
    pathPoints: PathPoint[],
    maxHp: number,
    speed: number,
    kpiDamage: number,
    hcReward: number
  ) {
    this.scene = scene
    this.pathPoints = pathPoints
    this.maxHp = maxHp
    this.hp = maxHp
    this.speed = speed
    this.kpiDamage = kpiDamage
    this.hcReward = hcReward

    if (pathPoints.length > 0) {
      this.x = pathPoints[0].x
      this.y = pathPoints[0].y
    }

    this.sprite = scene.add.graphics()
    this.healthBar = scene.add.graphics()
    this.quoteText = scene.add
      .text(this.x, this.y - 30, this.getQuote(), {
        fontFamily: 'VT323, monospace',
        fontSize: '12px',
        color: '#FFFFFF',
        backgroundColor: 'rgba(0,0,0,0.6)',
        padding: { x: 3, y: 2 },
      })
      .setOrigin(0.5, 1)
      .setDepth(15)
      .setAlpha(0)

    this.drawSprite()
    this.drawHealthBar()
  }

  update(delta: number): void {
    if (this.isDead || !this.isActive) return
    this.processDOT(delta)
    if (this.slowTimer > 0) {
      this.slowTimer -= delta
      if (this.slowTimer <= 0) this.slowEffect = 0
    }
    this.moveAlongPath(delta)
    this.drawHealthBar()
    this.sprite.setPosition(this.x, this.y)
  }

  protected processDOT(delta: number): void {
    for (let i = this.dotEffects.length - 1; i >= 0; i--) {
      const dot = this.dotEffects[i]
      dot.timer -= delta
      const tickDamage = (dot.damage / 1000) * delta
      this.hp -= tickDamage
      if (this.hp <= 0) {
        this.die()
        return
      }
      if (dot.timer <= 0) {
        this.dotEffects.splice(i, 1)
      }
    }
  }

  protected moveAlongPath(delta: number): void {
    if (this.currentPathIndex >= this.pathPoints.length - 1) {
      this.reachEnd()
      return
    }
    const target = this.pathPoints[this.currentPathIndex + 1]
    const currentSpeed = this.speed * (1 - this.slowEffect)
    const distance = (currentSpeed * delta) / 1000

    const dx = target.x - this.x
    const dy = target.y - this.y
    const dist = Math.sqrt(dx * dx + dy * dy)

    if (dist <= distance) {
      this.x = target.x
      this.y = target.y
      this.currentPathIndex++
    } else {
      this.x += (dx / dist) * distance
      this.y += (dy / dist) * distance
    }
  }

  protected drawHealthBar(): void {
    this.healthBar.clear()
    const bw = 30
    const bh = 4
    const bx = this.x - bw / 2
    const by = this.y - 20
    const ratio = Math.max(0, this.hp / this.maxHp)
    const color = ratio > 0.5 ? 0x22c55e : ratio > 0.25 ? 0xf59e0b : 0xef4444

    this.healthBar.fillStyle(0x374151, 1)
    this.healthBar.fillRect(bx, by, bw, bh)
    this.healthBar.fillStyle(color, 1)
    this.healthBar.fillRect(bx, by, bw * ratio, bh)
    this.healthBar.setDepth(14)
  }

  takeDamage(damage: number): void {
    if (this.isDead) return
    if (this.shieldCount > 0) {
      this.shieldCount--
      this.showShieldBlock()
      return
    }
    this.hp -= damage
    this.drawHealthBar()
    if (this.hp <= 0) {
      this.die()
    }
  }

  private showShieldBlock(): void {
    const txt = this.scene.add
      .text(this.x, this.y - 35, '护盾!', {
        fontFamily: 'VT323, monospace',
        fontSize: '14px',
        color: '#93C5FD',
      })
      .setOrigin(0.5, 1)
      .setDepth(20)
    this.scene.tweens.add({
      targets: txt,
      y: this.y - 55,
      alpha: 0,
      duration: 800,
      onComplete: () => txt.destroy(),
    })
  }

  addDOT(damage: number, duration: number): void {
    this.dotEffects.push({ damage, duration, timer: duration })
  }

  addSlow(percent: number, duration: number): void {
    this.slowEffect = Math.max(this.slowEffect, percent)
    this.slowTimer = Math.max(this.slowTimer, duration)
  }

  protected die(): void {
    if (this.isDead) return
    this.isDead = true
    const manager = GameManager.getInstance()
    manager.addHC(this.hcReward)
    this.onDeath()
    this.destroy()
  }

  protected reachEnd(): void {
    if (this.isDead) return
    const manager = GameManager.getInstance()
    manager.reduceKPI(this.kpiDamage)
    this.isDead = true
    this.destroy()
  }

  protected onDeath(): void {}

  /** 显示头顶语录（短暂） */
  showQuote(): void {
    this.quoteText.setText(this.getQuote())
    this.quoteText.setAlpha(1)
    this.scene.time.delayedCall(1500, () => {
      if (this.quoteText) this.quoteText.setAlpha(0)
    })
  }

  abstract drawSprite(): void
  abstract getQuote(): string

  destroy(): void {
    this.sprite?.destroy()
    this.healthBar?.destroy()
    this.quoteText?.destroy()
  }
}