import * as colors from './00colors.js';
import * as plugins from './00plugins.js';

import { DeesContextmenu } from './dees-contextmenu.js';
import { DeesInputBase } from './dees-input-base.js';
import { demoFunc } from './dees-input-fileupload.demo.js';

import {
  customElement,
  DeesElement,
  type TemplateResult,
  property,
  html,
  css,
  unsafeCSS,
  cssManager,
  type CSSResult,
  domtools,
} from '@design.estate/dees-element';

declare global {
  interface HTMLElementTagNameMap {
    'dees-input-fileupload': DeesInputFileupload;
  }
}

@customElement('dees-input-fileupload')
export class DeesInputFileupload extends DeesInputBase<DeesInputFileupload> {
  public static demo = demoFunc;


  @property({
    attribute: false,
  })
  public value: File[] = [];

  @property()
  public state: 'idle' | 'dragOver' | 'dropped' | 'uploading' | 'completed' = 'idle';

  @property({
    type: String,
  })
  public buttonText: string = 'Upload File...';

  @property({ type: String })
  public accept: string = '';

  @property({ type: Boolean })
  public multiple: boolean = true;

  @property({ type: Number })
  public maxSize: number = 0; // 0 means no limit

  @property({ type: Number })
  public maxFiles: number = 0; // 0 means no limit

  @property({ type: String, reflect: true })
  public validationState: 'valid' | 'invalid' | 'warn' | 'pending' = null;

  constructor() {
    super();
  }

  public static styles = [
    ...DeesInputBase.baseStyles,
    cssManager.defaultStyles,
    css`
      :host {
        position: relative;
        display: block;
        color: ${cssManager.bdTheme('hsl(0 0% 15%)', 'hsl(0 0% 90%)')};
      }

      .hidden {
        display: none;
      }

      .input-wrapper {
        display: flex;
        flex-direction: column;
        gap: 8px;
      }

      .maincontainer {
        position: relative;
        border-radius: 6px;
        padding: 16px;
        background: ${cssManager.bdTheme('hsl(210 40% 98%)', 'hsl(215 20.2% 11.8%)')};
        color: ${cssManager.bdTheme('hsl(0 0% 9%)', 'hsl(0 0% 95%)')};
        border: 1px solid ${cssManager.bdTheme('hsl(215 20.2% 65.1%)', 'hsl(215 20.2% 35.1%)')};
        transition: all 0.15s ease;
      }

      .maincontainer:hover {
        border-color: ${cssManager.bdTheme('hsl(215 20.2% 55.1%)', 'hsl(215 20.2% 45.1%)')};
      }

      :host([disabled]) .maincontainer {
        opacity: 0.5;
        cursor: not-allowed;
        pointer-events: none;
      }

      :host([validationState="invalid"]) .maincontainer {
        border-color: ${cssManager.bdTheme('hsl(0 72.2% 50.6%)', 'hsl(0 62.8% 30.6%)')};
      }

      :host([validationState="valid"]) .maincontainer {
        border-color: ${cssManager.bdTheme('hsl(142.1 70.6% 45.3%)', 'hsl(142.1 76.2% 36.3%)')};
      }

      :host([validationState="warn"]) .maincontainer {
        border-color: ${cssManager.bdTheme('hsl(45.4 93.4% 47.5%)', 'hsl(45.4 93.4% 47.5%)')};
      }

      .maincontainer::after {
        top: 1px;
        right: 1px;
        left: 1px;
        bottom: 1px;
        transform: scale3d(0.98, 0.95, 1);
        position: absolute;
        content: '';
        display: block;
        border: 2px dashed transparent;
        border-radius: 5px;
        transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        pointer-events: none;
        background: transparent;
      }
      
      .maincontainer.dragOver {
        border-color: ${cssManager.bdTheme('hsl(217.2 91.2% 59.8%)', 'hsl(213.1 93.9% 67.8%)')};
        background: ${cssManager.bdTheme('hsl(217.2 91.2% 59.8% / 0.05)', 'hsl(213.1 93.9% 67.8% / 0.05)')};
      }
      
      .maincontainer.dragOver::after {
        transform: scale3d(1, 1, 1);
        border: 2px dashed ${cssManager.bdTheme('hsl(217.2 91.2% 59.8%)', 'hsl(213.1 93.9% 67.8%)')};
      }

      .uploadButton {
        position: relative;
        padding: 10px 20px;
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(0 0% 7.8%)')};
        color: ${cssManager.bdTheme('hsl(0 0% 9%)', 'hsl(0 0% 95%)')};
        border: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
        border-radius: 6px;
        text-align: center;
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        transition: all 0.15s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        line-height: 20px;
      }

      .uploadButton:hover {
        background: ${cssManager.bdTheme('hsl(0 0% 95.1%)', 'hsl(0 0% 14.9%)')};
        border-color: ${cssManager.bdTheme('hsl(0 0% 79.8%)', 'hsl(0 0% 20.9%)')};
      }

      .uploadButton:active {
        background: ${cssManager.bdTheme('hsl(0 0% 91%)', 'hsl(0 0% 11%)')};
      }

      .uploadButton dees-icon {
        font-size: 16px;
      }

      .files-container {
        display: flex;
        flex-direction: column;
        gap: 8px;
        margin-bottom: 12px;
      }

      .uploadCandidate {
        display: grid;
        grid-template-columns: 40px 1fr auto;
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(215 20.2% 16.8%)')};
        padding: 12px;
        text-align: left;
        border-radius: 6px;
        color: ${cssManager.bdTheme('hsl(0 0% 9%)', 'hsl(0 0% 95%)')};
        cursor: default;
        transition: all 0.15s ease;
        border: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
        position: relative;
        overflow: hidden;
      }

      .uploadCandidate:hover {
        background: ${cssManager.bdTheme('hsl(0 0% 95.1%)', 'hsl(215 20.2% 20.8%)')};
        border-color: ${cssManager.bdTheme('hsl(0 0% 79.8%)', 'hsl(0 0% 20.9%)')};
      }

      .uploadCandidate .icon {
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 20px;
        color: ${cssManager.bdTheme('hsl(215.4 16.3% 56.9%)', 'hsl(215 20.2% 55.1%)')};
      }

      .uploadCandidate.image-file .icon {
        color: ${cssManager.bdTheme('hsl(142.1 70.6% 45.3%)', 'hsl(142.1 76.2% 36.3%)')};
      }
      
      .uploadCandidate.pdf-file .icon {
        color: ${cssManager.bdTheme('hsl(0 72.2% 50.6%)', 'hsl(0 62.8% 30.6%)')};
      }
      
      .uploadCandidate.doc-file .icon {
        color: ${cssManager.bdTheme('hsl(217.2 91.2% 59.8%)', 'hsl(213.1 93.9% 67.8%)')};
      }

      .uploadCandidate .info {
        display: flex;
        flex-direction: column;
        gap: 2px;
        min-width: 0;
      }
      
      .uploadCandidate .filename {
        font-weight: 500;
        font-size: 14px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
      }
      
      .uploadCandidate .filesize {
        font-size: 12px;
        color: ${cssManager.bdTheme('hsl(215.4 16.3% 56.9%)', 'hsl(215 20.2% 55.1%)')};
      }

      .uploadCandidate .actions {
        display: flex;
        align-items: center;
        gap: 8px;
      }

      .remove-button {
        width: 32px;
        height: 32px;
        border-radius: 4px;
        background: transparent;
        border: none;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.15s ease;
        color: ${cssManager.bdTheme('hsl(215.4 16.3% 56.9%)', 'hsl(215 20.2% 55.1%)')};
      }

      .remove-button:hover {
        background: ${cssManager.bdTheme('hsl(0 72.2% 50.6% / 0.1)', 'hsl(0 62.8% 30.6% / 0.1)')};
        color: ${cssManager.bdTheme('hsl(0 72.2% 50.6%)', 'hsl(0 62.8% 30.6%)')};
      }

      .clear-all-button {
        margin-bottom: 8px;
        text-align: right;
      }

      .clear-all-button button {
        background: none;
        border: none;
        color: ${cssManager.bdTheme('hsl(215.4 16.3% 56.9%)', 'hsl(215 20.2% 55.1%)')};
        cursor: pointer;
        font-size: 12px;
        padding: 4px 8px;
        border-radius: 4px;
        transition: all 0.15s ease;
      }

      .clear-all-button button:hover {
        background: ${cssManager.bdTheme('hsl(0 72.2% 50.6% / 0.1)', 'hsl(0 62.8% 30.6% / 0.1)')};
        color: ${cssManager.bdTheme('hsl(0 72.2% 50.6%)', 'hsl(0 62.8% 30.6%)')};
      }

      .validation-message {
        font-size: 13px;
        margin-top: 6px;
        color: ${cssManager.bdTheme('hsl(0 72.2% 50.6%)', 'hsl(0 62.8% 30.6%)')};
        line-height: 1.5;
      }

      .drop-hint {
        text-align: center;
        padding: 40px 20px;
        color: ${cssManager.bdTheme('hsl(215.4 16.3% 56.9%)', 'hsl(215 20.2% 55.1%)')};
        font-size: 14px;
      }

      .drop-hint dees-icon {
        font-size: 48px;
        margin-bottom: 16px;
        opacity: 0.2;
      }

      .image-preview {
        width: 40px;
        height: 40px;
        object-fit: cover;
        border-radius: 4px;
      }

      .description-text {
        font-size: 13px;
        color: ${cssManager.bdTheme('hsl(215.4 16.3% 56.9%)', 'hsl(215 20.2% 55.1%)')};
        margin-top: 6px;
        line-height: 1.5;
      }
    `,
  ];

  public render(): TemplateResult {
    const hasFiles = this.value.length > 0;
    const showClearAll = hasFiles && this.value.length > 1;
    
    return html`
      <div class="input-wrapper">
        ${this.label ? html`
          <dees-label .label=${this.label}></dees-label>
        ` : ''}
        <div class="hidden">
          <input 
            type="file" 
            ?multiple=${this.multiple}
            accept="${this.accept}"
          >
        </div>
        <div class="maincontainer ${this.state === 'dragOver' ? 'dragOver' : ''}">
          ${hasFiles ? html`
            ${showClearAll ? html`
              <div class="clear-all-button">
                <button @click=${this.clearAll}>Clear All</button>
              </div>
            ` : ''}
            <div class="files-container">
              ${this.value.map((fileArg) => {
                const fileType = this.getFileType(fileArg);
                const isImage = fileType === 'image';
                return html`
                  <div class="uploadCandidate ${fileType}-file">
                    <div class="icon">
                      ${isImage && this.canShowPreview(fileArg) ? html`
                        <img class="image-preview" src="${URL.createObjectURL(fileArg)}" alt="${fileArg.name}">
                      ` : html`
                        <dees-icon .iconName=${this.getFileIcon(fileArg)}></dees-icon>
                      `}
                    </div>
                    <div class="info">
                      <div class="filename" title="${fileArg.name}">${fileArg.name}</div>
                      <div class="filesize">${this.formatFileSize(fileArg.size)}</div>
                    </div>
                    <div class="actions">
                      <button 
                        class="remove-button" 
                        @click=${() => this.removeFile(fileArg)}
                        title="Remove file"
                      >
                        <dees-icon .iconName=${'lucide:x'}></dees-icon>
                      </button>
                    </div>
                  </div>
                `;
              })}
            </div>
          ` : html`
            <div class="drop-hint">
              <dees-icon .iconName=${'lucide:cloud-upload'}></dees-icon>
              <div>Drag files here or click to browse</div>
            </div>
          `}
          <div class="uploadButton" @click=${this.openFileSelector}>
            <dees-icon .iconName=${'lucide:upload'}></dees-icon>
            ${this.buttonText}
          </div>
        </div>
        ${this.description ? html`
          <div class="description-text">${this.description}</div>
        ` : ''}
        ${this.validationState === 'invalid' && this.validationMessage ? html`
          <div class="validation-message">${this.validationMessage}</div>
        ` : ''}
      </div>
    `;
  }

  private validationMessage: string = '';

  // Utility methods
  private formatFileSize(bytes: number): string {
    const sizes = ['Bytes', 'KB', 'MB', 'GB'];
    if (bytes === 0) return '0 Bytes';
    const i = Math.floor(Math.log(bytes) / Math.log(1024));
    return Math.round(bytes / Math.pow(1024, i) * 100) / 100 + ' ' + sizes[i];
  }

  private getFileType(file: File): string {
    const type = file.type.toLowerCase();
    if (type.startsWith('image/')) return 'image';
    if (type === 'application/pdf') return 'pdf';
    if (type.includes('word') || type.includes('document')) return 'doc';
    if (type.includes('sheet') || type.includes('excel')) return 'spreadsheet';
    if (type.includes('presentation') || type.includes('powerpoint')) return 'presentation';
    if (type.startsWith('video/')) return 'video';
    if (type.startsWith('audio/')) return 'audio';
    if (type.includes('zip') || type.includes('compressed')) return 'archive';
    return 'file';
  }

  private getFileIcon(file: File): string {
    const type = this.getFileType(file);
    const iconMap = {
      'image': 'lucide:image',
      'pdf': 'lucide:file-text',
      'doc': 'lucide:file-text',
      'spreadsheet': 'lucide:table',
      'presentation': 'lucide:presentation',
      'video': 'lucide:video',
      'audio': 'lucide:music',
      'archive': 'lucide:archive',
      'file': 'lucide:file'
    };
    return iconMap[type] || 'lucide:file';
  }

  private canShowPreview(file: File): boolean {
    return file.type.startsWith('image/') && file.size < 5 * 1024 * 1024; // 5MB limit for previews
  }

  private validateFile(file: File): boolean {
    // Check file size
    if (this.maxSize > 0 && file.size > this.maxSize) {
      this.validationMessage = `File "${file.name}" exceeds maximum size of ${this.formatFileSize(this.maxSize)}`;
      this.validationState = 'invalid';
      return false;
    }

    // Check file type
    if (this.accept) {
      const acceptedTypes = this.accept.split(',').map(s => s.trim());
      let isAccepted = false;
      
      for (const acceptType of acceptedTypes) {
        if (acceptType.startsWith('.')) {
          // Extension check
          if (file.name.toLowerCase().endsWith(acceptType.toLowerCase())) {
            isAccepted = true;
            break;
          }
        } else if (acceptType.endsWith('/*')) {
          // MIME type wildcard check
          const mimePrefix = acceptType.slice(0, -2);
          if (file.type.startsWith(mimePrefix)) {
            isAccepted = true;
            break;
          }
        } else if (file.type === acceptType) {
          // Exact MIME type check
          isAccepted = true;
          break;
        }
      }
      
      if (!isAccepted) {
        this.validationMessage = `File type not accepted. Please upload: ${this.accept}`;
        this.validationState = 'invalid';
        return false;
      }
    }

    return true;
  }

  public async openFileSelector() {
    if (this.disabled) return;
    const inputFile: HTMLInputElement = this.shadowRoot.querySelector('input[type="file"]');
    inputFile.click();
  }

  private removeFile(file: File) {
    const index = this.value.indexOf(file);
    if (index > -1) {
      this.value.splice(index, 1);
      this.requestUpdate();
      this.validate();
      this.changeSubject.next(this);
    }
  }

  private clearAll() {
    this.value = [];
    this.requestUpdate();
    this.validate();
    this.changeSubject.next(this);
  }

  public async updateValue(eventArg: Event) {
    const target: any = eventArg.target;
    this.value = target.value;
    this.changeSubject.next(this);
  }

  public firstUpdated(_changedProperties: Map<string | number | symbol, unknown>) {
    super.firstUpdated(_changedProperties);
    const inputFile: HTMLInputElement = this.shadowRoot.querySelector('input[type="file"]');
    inputFile.addEventListener('change', async (event: Event) => {
      const target = event.target as HTMLInputElement;
      const newFiles = Array.from(target.files);
      await this.addFiles(newFiles);
      // Reset the input value to allow selecting the same file again if needed
      target.value = '';
    });

    // Handle drag and drop
    const dropArea = this.shadowRoot.querySelector('.maincontainer');
    const handlerFunction = async (eventArg: DragEvent) => {
      eventArg.preventDefault();
      eventArg.stopPropagation();
      
      switch (eventArg.type) {
        case 'dragenter':
        case 'dragover':
          this.state = 'dragOver';
          break;
        case 'dragleave':
          // Check if we're actually leaving the drop area
          const rect = dropArea.getBoundingClientRect();
          const x = eventArg.clientX;
          const y = eventArg.clientY;
          if (x <= rect.left || x >= rect.right || y <= rect.top || y >= rect.bottom) {
            this.state = 'idle';
          }
          break;
        case 'drop':
          this.state = 'idle';
          const files = Array.from(eventArg.dataTransfer.files);
          await this.addFiles(files);
          break;
      }
    };
    
    dropArea.addEventListener('dragenter', handlerFunction, false);
    dropArea.addEventListener('dragleave', handlerFunction, false);
    dropArea.addEventListener('dragover', handlerFunction, false);
    dropArea.addEventListener('drop', handlerFunction, false);
  }

  private async addFiles(files: File[]) {
    const filesToAdd: File[] = [];
    
    for (const file of files) {
      if (this.validateFile(file)) {
        filesToAdd.push(file);
      }
    }

    if (filesToAdd.length === 0) return;

    // Check max files limit
    if (this.maxFiles > 0) {
      const totalFiles = this.value.length + filesToAdd.length;
      if (totalFiles > this.maxFiles) {
        const allowedCount = this.maxFiles - this.value.length;
        if (allowedCount <= 0) {
          this.validationMessage = `Maximum ${this.maxFiles} files allowed`;
          this.validationState = 'invalid';
          return;
        }
        filesToAdd.splice(allowedCount);
        this.validationMessage = `Only ${allowedCount} more file(s) can be added`;
        this.validationState = 'warn';
      }
    }

    // Add files
    if (!this.multiple && filesToAdd.length > 0) {
      this.value = [filesToAdd[0]];
    } else {
      this.value.push(...filesToAdd);
    }

    this.requestUpdate();
    this.validate();
    this.changeSubject.next(this);
    
    // Update button text
    if (this.value.length > 0) {
      this.buttonText = this.multiple ? 'Add more files' : 'Replace file';
    }
  }

  public async validate(): Promise<boolean> {
    this.validationMessage = '';
    
    if (this.required && this.value.length === 0) {
      this.validationState = 'invalid';
      this.validationMessage = 'Please select at least one file';
      return false;
    }
    
    // Validate all files
    for (const file of this.value) {
      if (!this.validateFile(file)) {
        return false;
      }
    }
    
    this.validationState = 'valid';
    return true;
  }

  public getValue(): File[] {
    return this.value;
  }

  public setValue(value: File[]): void {
    this.value = value;
    this.requestUpdate();
    if (value.length > 0) {
      this.buttonText = this.multiple ? 'Add more files' : 'Replace file';
    } else {
      this.buttonText = 'Upload File...';
    }
  }

  public updated(changedProperties: Map<string, any>) {
    super.updated(changedProperties);
    
    if (changedProperties.has('value')) {
      this.validate();
    }
  }
}