/* eslint-disable max-len */
import test from 'tape-catch';
import GL from '@luma.gl/constants';
import {Framebuffer, Renderbuffer, Texture2D} from '@luma.gl/webgl';
import {fixture} from 'test/setup';

const TEST_CASES = [
  {
    title: 'Default attachments',
    getOpts: gl => ({}),
    pass: true
  },
  {
    title: 'No attachments',
    getOpts: gl => ({attachments: {}}),
    pass: false
  },
  {
    title: 'Simple Depth Renderbuffer + Color Texture',
    getOpts: gl => ({
      attachments: {
        [GL.COLOR_ATTACHMENT0]: new Texture2D(gl),
        [GL.DEPTH_ATTACHMENT]: new Renderbuffer(gl, {format: GL.DEPTH_COMPONENT16})
      }
    }),
    pass: true
  },
  {
    title: 'Simple Stencil Renderbuffer + Color Texture',
    getOpts: gl => ({
      attachments: {
        [GL.COLOR_ATTACHMENT0]: new Texture2D(gl),
        [GL.STENCIL_ATTACHMENT]: new Renderbuffer(gl, {format: GL.STENCIL_INDEX8})
      }
    }),
    pass: true
  },
  {
    title: 'Combined Depth/Stencil Renderbuffer + Color Texture',
    getOpts: gl => ({
      attachments: {
        [GL.COLOR_ATTACHMENT0]: new Texture2D(gl),
        [GL.DEPTH_STENCIL_ATTACHMENT]: new Renderbuffer(gl, {format: GL.DEPTH_STENCIL})
      }
    }),
    pass: true
  }
  // {
  //   title: 'Separate Depth/Stencil Renderbuffers',
  //   getOpts: (gl) => ({
  //     attachments: {
  //       [GL.COLOR_ATTACHMENT0]: new Texture2D(gl),
  //       [GL.DEPTH]: new Renderbuffer(gl, {format: GL.DEPTH_COMPONENT16}),
  //       [GL.STENCIL]: new Renderbuffer(gl, {format: GL.STENCIL_INDEX8})
  //     }
  //   }),
  //   pass: false
  // }
  // {
  //   features: FEATURES.MULTIPLE_RENDER_TARGETS,
  //   getOpts(gl) {
  //     attachments: {
  //       [GL.COLOR_ATTACHMENT0]: new Texture2D(gl),
  //       [GL.COLOR_ARTTACHMENT1]: new Texture2D(gl),
  //       [GL.DEPTH]: new Renderbuffer(gl)
  //     }
  //   },
  //   pass: true
  // }
];

test('WebGL#Framebuffer construct/delete', t => {
  const {gl} = fixture;

  t.throws(
    () => new Framebuffer(),
    /.*WebGLRenderingContext.*/,
    'Framebuffer throws on missing gl context'
  );

  const framebuffer = new Framebuffer(gl);
  t.ok(framebuffer instanceof Framebuffer, 'Framebuffer construction successful');

  framebuffer.delete();
  t.ok(framebuffer instanceof Framebuffer, 'Framebuffer delete successful');

  framebuffer.delete();
  t.ok(framebuffer instanceof Framebuffer, 'Framebuffer repeated delete successful');

  t.end();
});

test('Framebuffer#getDefaultFramebuffer', t => {
  const {gl} = fixture;

  const framebuffer = Framebuffer.getDefaultFramebuffer(gl);
  t.ok(framebuffer instanceof Framebuffer, 'getDefaultFramebuffer successful');

  t.throws(
    () => framebuffer.resize({width: 1000, height: 1000}),
    'defaultFramebuffer.resize({width, height}) throws'
  );

  t.doesNotThrow(() => framebuffer.resize(), 'defaultFramebuffer.resize() successful');

  t.doesNotThrow(() => framebuffer.checkStatus(), 'defaultFramebuffer status ok');

  t.end();
});

function testFramebuffer(t, gl) {
  for (const tc of TEST_CASES) {
    let opts;

    t.doesNotThrow(() => {
      opts = tc.getOpts(gl);
    }, `Framebuffer options constructed for "${tc.title}"`);

    const testFramebufferOpts = () => {
      const framebuffer = new Framebuffer(gl, opts);

      framebuffer.resize({width: 1000, height: 1000});
      framebuffer.checkStatus();

      framebuffer.resize({width: 100, height: 100});
      framebuffer.checkStatus();

      framebuffer.delete({recursive: true});
    };

    if (tc.pass) {
      t.doesNotThrow(
        testFramebufferOpts,
        `Framebuffer checkStatus success as expected for "${tc.title}"`
      );
    } else {
      t.throws(
        testFramebufferOpts,
        `Framebuffer checkStatus failure as expected for "${tc.title}"`
      );
    }
  }
}

test('WebGL1#Framebuffer attachments', t => {
  const {gl} = fixture;
  testFramebuffer(t, gl);
  t.end();
});

test('WebGL2#Framebuffer attachments', t => {
  const {gl2} = fixture;
  if (gl2) {
    testFramebuffer(t, gl2);
  } else {
    t.comment('WebGL2 not available, skipping tests');
  }
  t.end();
});

function testFramebufferResize(t, gl) {
  const frameBufferOptions = {
    attachments: {
      [GL.COLOR_ATTACHMENT0]: new Texture2D(gl),
      [GL.DEPTH_STENCIL_ATTACHMENT]: new Renderbuffer(gl, {format: GL.DEPTH_STENCIL})
    }
  };

  const framebuffer = new Framebuffer(gl, frameBufferOptions);

  framebuffer.resize({width: 1000, height: 1000});
  t.equals(framebuffer.width, 1000, 'Framebuffer width updated correctly on resize');
  t.equals(framebuffer.height, 1000, 'Framebuffer height updated correctly on resize');
  framebuffer.checkStatus();

  framebuffer.resize({width: 100, height: 100});
  t.equals(framebuffer.width, 100, 'Framebuffer width updated correctly on resize');
  t.equals(framebuffer.height, 100, 'Framebuffer height updated correctly on resize');
  framebuffer.checkStatus();
}

test('WebGL1#Framebuffer resize', t => {
  const {gl} = fixture;
  testFramebufferResize(t, gl);
  t.end();
});
/*

import {TEXTURE_FORMATS} from '@luma.gl/webgl/texture-formats';

const RGB_TO = {
  [GL.UNSIGNED_BYTE]: (r, g, b) => [r * 256, g * 256, b * 256],
  [GL.UNSIGNED_SHORT_5_6_5]: (r, g, b) => r * 32 << 11 + g * 64 << 6 + b * 32
};
// const RGB_FROM = {
//   [GL.UNSIGNED_BYTE]: v => [v[0] / 256, v[1] / 256, v[2] / 256],
//   [GL.UNSIGNED_SHORT_5_6_5]: v => [v >> 11 / 32, v >> 6 % 64 / 64, v % 32 * 32]
// };

const DATA = [1, 0.5, 0.25, 0.125];
const TEXTURE_DATA = {
  [GL.UNSIGNED_BYTE]: new Uint8Array(RGB_TO[GL.UNSIGNED_BYTE](DATA)),
  [GL.UNSIGNED_SHORT_5_6_5]: new Uint16Array(RGB_TO[GL.UNSIGNED_SHORT_5_6_5](DATA))
};
const DEFAULT_TEXTURE_DATA = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);

test('WebGL2#Framebuffer texture attach and read', t => {
  const {gl2} = fixture;

  if (!gl2) {
    t.comment('WebGL2 not available, skipping tests');
    t.end();
    return;
  }

  const framebuffer = new Framebuffer(gl2, {depth: true, width: 1, height: 1, check: false});

  for (let format in TEXTURE_FORMATS) {
    const textureFormat = TEXTURE_FORMATS[format];

    const {dataFormat, types, compressed} = textureFormat;
    format = Number(format);

    if (Texture2D.isSupported(gl2, {format}) && !compressed) {

      let texture;

      for (const type of types) {
        // texture = new Texture2D(gl2, Object.assign({format, dataFormat, type}));
        // t.equals(texture.format, format,
        //   `Texture2D({format: ${getKey(format)}, type: ${getKey(type)}, dataFormat: ${getKey(dataFormat)}) created`);
        // texture.delete()
        const data = TEXTURE_DATA[type] || DEFAULT_TEXTURE_DATA;
        texture = new Texture2D(gl2, {format, dataFormat, type, data, width: 1, height: 1});
        t.equals(texture.format, format,
          `Texture2D({format: ${getKey(format)}, type: ${getKey(type)}, dataFormat: ${getKey(dataFormat)}) created`);

        framebuffer.attach({
          [GL.COLOR_ATTACHMENT0]: texture
        });
        t.doesNotThrow(
          () => framebuffer.checkStatus(),
          'Framebuffer is attachment complete'
        );

        let pixels;
        t.doesNotThrow(
          () => {
            pixels = radPixelsToArray(framebuffer);
          },
          'Framebuffer.readPixels returned'
        );
        t.ok(pixels, 'Received pixels');
        texture.delete();
      }
    }
  }

  t.end();
});
*/