import { TextUtils } from '@blocksuite/affine-block-surface';
import type { EdgelessTextBlockModel } from '@blocksuite/affine-model';
import { ThemeProvider } from '@blocksuite/affine-shared/services';
import { matchFlavours } from '@blocksuite/affine-shared/utils';
import type { BlockComponent } from '@blocksuite/block-std';
import {
  BlockSelection,
  GfxBlockComponent,
  TextSelection,
} from '@blocksuite/block-std';
import { Bound } from '@blocksuite/global/utils';
import { css, html } from 'lit';
import { query, state } from 'lit/decorators.js';
import { type StyleInfo, styleMap } from 'lit/directives/style-map.js';

export const EDGELESS_TEXT_BLOCK_MIN_WIDTH = 50;
export const EDGELESS_TEXT_BLOCK_MIN_HEIGHT = 50;

export class EdgelessTextBlockComponent extends GfxBlockComponent<EdgelessTextBlockModel> {
  static override styles = css`
    .edgeless-text-block-container[data-max-width='false'] .inline-editor span {
      word-break: keep-all !important;
      text-wrap: nowrap !important;
    }

    .edgeless-text-block-container affine-paragraph,
    affine-list {
      color: var(--edgeless-text-color);
      font-family: var(--edgeless-text-font-family);
      font-style: var(--edgeless-text-font-style);
      font-weight: var(--edgeless-text-font-weight);
      text-align: var(--edgeless-text-text-align);
    }
  `;

  private readonly _resizeObserver = new ResizeObserver(() => {
    if (this.doc.readonly) {
      return;
    }

    if (!this.model.hasMaxWidth) {
      this._updateW();
    }

    this._updateH();
  });

  private _updateH() {
    const bound = Bound.deserialize(this.model.xywh);
    const rect = this._textContainer.getBoundingClientRect();
    bound.h = rect.height / this.gfx.viewport.zoom;

    this.doc.updateBlock(this.model, {
      xywh: bound.serialize(),
    });
  }

  private _updateW() {
    const bound = Bound.deserialize(this.model.xywh);
    const rect = this._textContainer.getBoundingClientRect();
    bound.w = Math.max(
      rect.width / this.gfx.viewport.zoom,
      EDGELESS_TEXT_BLOCK_MIN_WIDTH * this.gfx.viewport.zoom
    );

    this.doc.updateBlock(this.model, {
      xywh: bound.serialize(),
    });
  }

  checkWidthOverflow(width: number) {
    let wValid = true;

    const oldWidthStr = this._textContainer.style.width;
    this._textContainer.style.width = `${width}px`;
    if (
      this.childrenContainer.scrollWidth > this.childrenContainer.offsetWidth
    ) {
      wValid = false;
    }
    this._textContainer.style.width = oldWidthStr;

    return wValid;
  }

  override connectedCallback() {
    super.connectedCallback();

    this.disposables.add(
      this.model.propsUpdated.on(({ key }) => {
        this.updateComplete
          .then(() => {
            const command = this.std.command;
            const blockSelections = this.model.children.map(child =>
              this.std.selection.create(BlockSelection, {
                blockId: child.id,
              })
            );

            if (key === 'fontStyle') {
              command.exec('formatBlock', {
                blockSelections,
                styles: {
                  italic: null,
                },
              });
            } else if (key === 'color') {
              command.exec('formatBlock', {
                blockSelections,
                styles: {
                  color: null,
                },
              });
            } else if (key === 'fontWeight') {
              command.exec('formatBlock', {
                blockSelections,
                styles: {
                  bold: null,
                },
              });
            }
          })
          .catch(console.error);
      })
    );
  }

  override firstUpdated(props: Map<string, unknown>) {
    super.firstUpdated(props);

    const { disposables, std } = this;
    const edgelessSelection = this.gfx.selection;

    disposables.add(
      edgelessSelection.slots.updated.on(() => {
        if (edgelessSelection.has(this.model.id) && edgelessSelection.editing) {
          this._editing = true;
        } else {
          this._editing = false;
        }
      })
    );

    this._resizeObserver.observe(this._textContainer);
    disposables.add(() => {
      this._resizeObserver.disconnect();
    });

    disposables.addFromEvent(this._textContainer, 'click', e => {
      if (!this._editing) return;

      const containerRect = this._textContainer.getBoundingClientRect();
      const isTop = e.clientY < containerRect.top + containerRect.height / 2;

      let newParagraphId: string | null = null;
      if (isTop) {
        const firstChild = this.model.firstChild();
        if (
          !firstChild ||
          !matchFlavours(firstChild, ['affine:list', 'affine:paragraph'])
        ) {
          newParagraphId = this.doc.addBlock(
            'affine:paragraph',
            {},
            this.model.id,
            0
          );
        }
      } else {
        const lastChild = this.model.lastChild();
        if (
          !lastChild ||
          !matchFlavours(lastChild, ['affine:list', 'affine:paragraph'])
        ) {
          newParagraphId = this.doc.addBlock(
            'affine:paragraph',
            {},
            this.model.id
          );
        }
      }

      if (newParagraphId) {
        std.selection.setGroup('note', [
          std.selection.create(TextSelection, {
            from: {
              blockId: newParagraphId,
              index: 0,
              length: 0,
            },
            to: null,
          }),
        ]);
      }
    });

    disposables.addFromEvent(this._textContainer, 'focusout', () => {
      if (!this._editing) return;

      this.std.selection.clear();
    });

    let composingWidth = EDGELESS_TEXT_BLOCK_MIN_WIDTH;
    disposables.addFromEvent(this, 'compositionupdate', () => {
      composingWidth = Math.max(
        this._textContainer.offsetWidth,
        EDGELESS_TEXT_BLOCK_MIN_HEIGHT
      );
    });
    disposables.addFromEvent(this, 'compositionend', () => {
      if (this.model.hasMaxWidth) {
        composingWidth = EDGELESS_TEXT_BLOCK_MIN_WIDTH;
        return;
      }
      // when IME finish container will crash to a small width, so
      // we set a max width to prevent this
      this._textContainer.style.width = `${composingWidth}px`;
      this.model.hasMaxWidth = true;
      requestAnimationFrame(() => {
        this._textContainer.style.width = '';
      });
    });
  }

  override getCSSTransform(): string {
    const viewport = this.gfx.viewport;
    const { translateX, translateY, zoom } = viewport;
    const bound = Bound.deserialize(this.model.xywh);

    const scaledX = bound.x * zoom;
    const scaledY = bound.y * zoom;
    const deltaX = scaledX - bound.x;
    const deltaY = scaledY - bound.y;

    return `translate(${translateX + deltaX}px, ${translateY + deltaY}px) scale(${zoom * this.model.scale})`;
  }

  override getRenderingRect() {
    const { xywh, scale, rotate, hasMaxWidth } = this.model;
    const bound = Bound.deserialize(xywh);
    const w = hasMaxWidth ? bound.w / scale : undefined;

    return {
      x: bound.x,
      y: bound.y,
      w,
      h: bound.h / scale,
      rotate,
      zIndex: this.toZIndex(),
    };
  }

  override renderGfxBlock() {
    const { model } = this;
    const { rotate, hasMaxWidth } = model;
    const editing = this._editing;
    const containerStyle: StyleInfo = {
      transform: `rotate(${rotate}deg)`,
      transformOrigin: 'center',
      border: `1px solid ${editing ? 'var(--affine—primary—color, #1e96eb)' : 'transparent'}`,
      borderRadius: '4px',
      boxSizing: 'border-box',
      boxShadow: editing ? '0px 0px 0px 2px rgba(30, 150, 235, 0.3)' : 'none',
      fontWeight: '400',
      lineHeight: 'var(--affine-line-height)',
    };

    return html`
      <div
        class="edgeless-text-block-container"
        data-max-width="${hasMaxWidth}"
        style=${styleMap(containerStyle)}
      >
        <div
          style=${styleMap({
            pointerEvents: editing ? 'auto' : 'none',
            userSelect: editing ? 'auto' : 'none',
          })}
          contenteditable=${editing}
        >
          ${this.renderPageContent()}
        </div>
      </div>
    `;
  }

  override renderPageContent() {
    const { fontFamily, fontStyle, fontWeight, textAlign } = this.model;
    const color = this.std
      .get(ThemeProvider)
      .generateColorProperty(this.model.color, '#000000');

    const style = styleMap({
      '--edgeless-text-color': color,
      '--edgeless-text-font-family': TextUtils.wrapFontFamily(fontFamily),
      '--edgeless-text-font-style': fontStyle,
      '--edgeless-text-font-weight': fontWeight,
      '--edgeless-text-text-align': textAlign,
      '--affine-list-margin': '0',
      '--affine-paragraph-margin': '0',
    });

    return html`
      <div style=${style} class="affine-block-children-container">
        ${this.renderChildren(this.model)}
      </div>
    `;
  }

  tryFocusEnd() {
    const paragraphOrLists = Array.from(
      this.querySelectorAll<BlockComponent>('affine-paragraph, affine-list')
    );
    const last = paragraphOrLists.at(-1);
    if (last) {
      this.host.selection.setGroup('note', [
        this.host.selection.create(TextSelection, {
          from: {
            blockId: last.blockId,
            index: last.model.text?.length ?? 0,
            length: 0,
          },
          to: null,
        }),
      ]);
    }
  }

  @state()
  private accessor _editing = false;

  @query('.edgeless-text-block-container')
  private accessor _textContainer!: HTMLDivElement;

  @query('.affine-block-children-container')
  accessor childrenContainer!: HTMLDivElement;
}

declare global {
  interface HTMLElementTagNameMap {
    'affine-edgeless-text': EdgelessTextBlockComponent;
  }
}