import CodeEditor from '../components/CodeEditor';
import { useEffect, useState } from 'react';
import ColorPicker from 'react-best-gradient-color-picker';
import Accordion from '../components/Accordian';
import Switch from '../components/Switch';
import { sendThemeUpdate } from '../hooks/ThemeManagment';
import { PlusIcon, XMarkIcon } from '@heroicons/react/24/outline';
import localforage from 'localforage';
import { v4 as uuidv4 } from 'uuid';
import { CustomTheme } from '../types/CustomThemes';

function ThemeCreator({ themeID }: { themeID?: string }) {
  const [theme, setTheme] = useState<CustomTheme>({
    id: uuidv4(),
    name: '',
    description: '',
    defaultColour: '',
    CanChangeColour: true,
    CustomCSS: '',
    CustomImages: []
  });

  useEffect(() => {
    if (themeID) {
      localforage.getItem(themeID).then((theme) => {
        if (theme) {
          setTheme(theme as CustomTheme);
        }
      });
    }
  });

  const generateImageId = () => {
    return '_' + Math.random().toString(36).substr(2, 9);
  };

  const handleImageUpload = (event: React.ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0];
    if (file) {
      const reader = new FileReader();
      reader.onload = async () => {
        const imageBlob = await fetch(reader.result as string).then(res => res.blob());
        const imageId = generateImageId();
        const variableName = `custom-image-${theme.CustomImages.length}`;
        const updatedTheme = {
          ...theme,
          CustomImages: [...theme.CustomImages, { id: imageId, blob: imageBlob, variableName }],
        };
        setTheme(updatedTheme);
        sendThemeUpdate(updatedTheme, false, true);
      };
      reader.readAsDataURL(file);
    }
  };
  
  const handleRemoveImage = (imageId: string) => {
    const updatedTheme = {
      ...theme,
      CustomImages: theme.CustomImages.filter((image) => image.id !== imageId),
    };
    setTheme(updatedTheme);
  };
  
  const handleImageVariableChange = (imageId: string, variableName: string) => {
    const updatedTheme = {
      ...theme,
      CustomImages: theme.CustomImages.map((image) =>
        image.id === imageId ? { ...image, variableName } : image
      ),
    };
    setTheme(updatedTheme);
  };

  function CodeUpdate(value: string) {
    setTheme((prevTheme) => ({
      ...prevTheme,
      CustomCSS: value,
    }));
  }

  const saveTheme = async () => {
    sendThemeUpdate(theme, true)
  };

  useEffect(() => {
    sendThemeUpdate(theme);
  }, [theme]);
  
  return (
    <div className='w-full min-h-[100vh] bg-zinc-100 dark:bg-zinc-800 dark:text-white transition duration-30'>
      <div className='flex flex-col p-2'>
        <h1 className='text-xl font-semibold'>Theme Creator</h1>

        <Divider />

        <div>
          <div className='pb-2 text-sm'>Theme Name</div>
          <input
            id='themeName'
            type='text'
            placeholder='What is your theme called?'
            value={theme.name}
            onChange={e => setTheme({ ...theme, name: e.target.value })}
            className='w-full p-2 mb-4 transition-all duration-300 rounded-lg focus:outline-none ring-0 focus:ring-1 ring-zinc-100 dark:ring-zinc-700 dark:bg-zinc-900 dark:text-white' />
        </div>

        <div>
          <div className='pb-2 text-sm'>Description <span className='italic opacity-80'>(optional)</span></div>
          <textarea
          id='themeDescription'
          placeholder="Don't worry, this one's optional!"
          value={theme.description}
          onChange={e => setTheme({ ...theme, description: e.target.value })}
          className='w-full p-2 rounded-lg focus:outline-none ring-0 focus:ring-1 ring-zinc-100 dark:ring-zinc-700 dark:bg-zinc-900 dark:text-white' />
        </div>

        <Divider />
        
        <Accordion defaultOpened title='Default Theme Colour'>
          <div className='p-2 mt-2 bg-white rounded-lg w-fit dark:bg-zinc-900'>
            <ColorPicker
              width={278}
              disableDarkMode={true}
              hideInputs={true}
              value={theme.defaultColour}
              onChange={(color: string) => setTheme({ ...theme, defaultColour: color })} />
          </div>
          
          <div className='flex items-center justify-between pt-4'>
            <div>
              <div className='pr-2 text-sm font-semibold'>Customisable</div>
              <div className='pr-2 text-[11px]'>Allow users to change the theme colour</div>
            </div>
            <Switch
              state={theme.CanChangeColour}
              onChange={value => setTheme({ ...theme, CanChangeColour: value })} />
          </div>
        </Accordion>
        
        <Divider />

        <h2 className='pb-1 text-lg font-semibold'>Custom Images</h2>
        <p className='pb-3 text-sm'>Upload images to include them in your theme via css variables.</p>

        {theme.CustomImages.map((image) => (
          <div key={image.id} className="flex items-center h-16 py-2 mb-4 bg-white rounded-lg shadow-lg dark:bg-zinc-900">
            <div className="flex-1 h-full ">
              <img src={URL.createObjectURL(image.blob)} alt={image.variableName} className="object-contain h-full rounded" />
            </div>
            <input
              type="text"
              value={image.variableName}
              onChange={(e) => handleImageVariableChange(image.id, e.target.value)}
              placeholder="CSS Variable Name"
              className="flex-grow flex-[3] w-full p-2 transition-all duration-300 rounded-lg focus:outline-none ring-0 focus:ring-1 ring-zinc-100 dark:ring-zinc-700 dark:bg-zinc-800/50 dark:text-white"
            />
            <button onClick={() => handleRemoveImage(image.id)} className="p-2 ml-1 transition dark:text-white">
              <XMarkIcon height={20} />
            </button>
          </div>
        ))}

        <div className="relative flex justify-center w-full h-8 gap-1 overflow-hidden transition rounded-lg place-items-center bg-zinc-100 dark:bg-zinc-900">
          <PlusIcon height={18} />
          <span className='dark:text-white'>Add image</span>
          <input type="file" accept='image/*' onChange={handleImageUpload} className="absolute inset-0 w-full h-full opacity-0 cursor-pointer" />
        </div>

        <Divider />
        
        <Accordion defaultOpened title='Custom CSS'>
          <CodeEditor
            className='mt-2'
            height='300px'
            initialState={theme.CustomCSS}
            callback={CodeUpdate} />
        </Accordion>

        <Divider />
        
        <button disabled={ theme.name === '' } onClick={saveTheme} className='w-full px-4 py-2 text-white transition bg-blue-500 rounded-lg dark:disabled:bg-zinc-700 disabled:bg-zinc-100 disabled:cursor-not-allowed dark:text-white'>
          Save theme
        </button>
      </div>
    </div>
  );
}

function Divider() {
  return <div className='w-full h-0.5 my-4 bg-zinc-200 dark:bg-zinc-700'></div>;
}

export default ThemeCreator;