import BinaryStream from '../../common/binarystream';
import TokenStream from './tokenstream';
import AnimatedObject from './animatedobject';

const filterModeToMdx = {
  None: 0,
  Transparent: 1,
  Blend: 2,
  Additive: 3,
  AddAlpha: 4,
  Modulate: 5,
  Modulate2x: 6,
};

const filterModeToMdl = {
  0: 'None',
  1: 'Transparent',
  2: 'Blend',
  3: 'Additive',
  4: 'AddAlpha',
  5: 'Modulate',
  6: 'Modulate2x',
};

/**
 * A layer.
 */
export default class Layer extends AnimatedObject {
  filterMode: number = 0;
  flags: number = 0;
  textureId: number = -1;
  textureAnimationId: number = -1;
  coordId: number = 0;
  alpha: number = 1;
  /** 
   * @since 900
   */
  emissiveGain: number = 1;
  /** 
   * @since 1000
   */
  fresnelColor: Float32Array = new Float32Array([1, 1, 1]);
  /** 
   * @since 1000
   */
  fresnelOpacity: number = 0;
  /** 
   * @since 1000
   */
  fresnelTeamColor: number = 0;

  readMdx(stream: BinaryStream, version: number) {
    const start = stream.index;
    const size = stream.readUint32();

    this.filterMode = stream.readUint32();
    this.flags = stream.readUint32();
    this.textureId = stream.readInt32();
    this.textureAnimationId = stream.readInt32();
    this.coordId = stream.readUint32();
    this.alpha = stream.readFloat32();

    // Note that even though these fields were introduced in versions 900 and 1000 separately, the game does not offer backwards compatibility.
    if (version > 800) {
      this.emissiveGain = stream.readFloat32();
      stream.readFloat32Array(this.fresnelColor);
      this.fresnelOpacity = stream.readFloat32();
      this.fresnelTeamColor = stream.readFloat32();
    }

    this.readAnimations(stream, size - (stream.index - start));
  }

  writeMdx(stream: BinaryStream, version: number) {
    stream.writeUint32(this.getByteLength(version));
    stream.writeUint32(this.filterMode);
    stream.writeUint32(this.flags);
    stream.writeInt32(this.textureId);
    stream.writeInt32(this.textureAnimationId);
    stream.writeUint32(this.coordId);
    stream.writeFloat32(this.alpha);

    // See note above in readMdx.
    if (version > 800) {
      stream.writeFloat32(this.emissiveGain);
      stream.writeFloat32Array(this.fresnelColor);
      stream.writeFloat32(this.fresnelOpacity);
      stream.writeFloat32(this.fresnelTeamColor);
    }

    this.writeAnimations(stream);
  }

  readMdl(stream: TokenStream) {
    for (let token of super.readAnimatedBlock(stream)) {
      if (token === 'FilterMode') {
        this.filterMode = filterModeToMdx[stream.read()];
      } else if (token === 'Unshaded') {
        this.flags |= 0x1;
      } else if (token === 'SphereEnvMap') {
        this.flags |= 0x2;
      } else if (token === 'TwoSided') {
        this.flags |= 0x10;
      } else if (token === 'Unfogged') {
        this.flags |= 0x20;
      } else if (token === 'NoDepthTest') {
        this.flags |= 0x40;
      } else if (token === 'NoDepthSet') {
        this.flags |= 0x80;
      } else if (token === 'Unlit') {
        this.flags |= 0x100;
      } else if (token === 'static TextureID') {
        this.textureId = stream.readInt();
      } else if (token === 'TextureID') {
        this.readAnimation(stream, 'KMTF');
      } else if (token === 'TVertexAnimId') {
        this.textureAnimationId = stream.readInt();
      } else if (token === 'CoordId') {
        this.coordId = stream.readInt();
      } else if (token === 'static Alpha') {
        this.alpha = stream.readFloat();
      } else if (token === 'Alpha') {
        this.readAnimation(stream, 'KMTA');
      } else if (token === 'static EmissiveGain') {
        this.emissiveGain = stream.readFloat();
      } else if (token === 'EmissiveGain') {
        this.readAnimation(stream, 'KMTE')
      } else if (token === 'static FresnelColor') {
        stream.readVector(this.fresnelColor);
      } else if (token === 'FresnelColor') {
        this.readAnimation(stream, 'KFC3')
      } else if (token === 'static FresnelOpacity') {
        this.fresnelOpacity = stream.readFloat();
      } else if (token === 'FresnelOpacity') {
        this.readAnimation(stream, 'KFCA')
      } else if (token === 'static FresnelTeamColor') {
        this.fresnelTeamColor = stream.readFloat();
      } else if (token === 'FresnelTeamColor') {
        this.readAnimation(stream, 'KFTC')
      } else {
        throw new Error(`Unknown token in Layer: "${token}"`);
      }
    }
  }

  writeMdl(stream: TokenStream, version: number) {
    stream.startBlock('Layer');

    stream.writeFlagAttrib('FilterMode', filterModeToMdl[this.filterMode]);

    if (this.flags & 0x1) {
      stream.writeFlag('Unshaded');
    }

    if (this.flags & 0x2) {
      stream.writeFlag('SphereEnvMap');
    }

    if (this.flags & 0x10) {
      stream.writeFlag('TwoSided');
    }

    if (this.flags & 0x20) {
      stream.writeFlag('Unfogged');
    }

    if (this.flags & 0x40) {
      stream.writeFlag('NoDepthTest');
    }

    if (this.flags & 0x80) {
      stream.writeFlag('NoDepthSet');
    }

    if (version > 800) {
      if (this.flags & 0x100) {
        stream.writeFlag('Unlit');
      }
    }

    if (!this.writeAnimation(stream, 'KMTF')) {
      stream.writeNumberAttrib('static TextureID', this.textureId);
    }

    if (this.textureAnimationId !== -1) {
      stream.writeNumberAttrib('TVertexAnimId', this.textureAnimationId);
    }

    if (this.coordId !== 0) {
      stream.writeNumberAttrib('CoordId', this.coordId);
    }

    if (!this.writeAnimation(stream, 'KMTA') && this.alpha !== 1) {
      stream.writeNumberAttrib('static Alpha', this.alpha);
    }

    if (version > 800) {
      if (!this.writeAnimation(stream, 'KMTE') && this.emissiveGain !== 1) {
        stream.writeNumberAttrib('static EmissiveGain', this.emissiveGain);
      }

      if (!this.writeAnimation(stream, 'KFC3') && (this.fresnelColor[0] !== 1 || this.fresnelColor[1] !== 1 || this.fresnelColor[2] !== 1)) {
        stream.writeVectorAttrib('static FresnelColor', this.fresnelColor);
      }

      if (!this.writeAnimation(stream, 'KFCA') && this.fresnelOpacity !== 0) {
        stream.writeNumberAttrib('static FresnelOpacity', this.fresnelOpacity);
      }

      if (!this.writeAnimation(stream, 'KFTC') && this.fresnelTeamColor !== 0) {
        stream.writeNumberAttrib('static FresnelTeamColor', this.fresnelTeamColor);
      }
    }

    stream.endBlock();
  }

  getByteLength(version: number) {
    let size = 28 + super.getByteLength();

    // See note above in readMdx.
    if (version > 800) {
      size += 24;
    }

    return size;
  }
}