import {
  DefaultTool,
  EdgelessLegacySlotIdentifier,
} from '@blocksuite/affine-block-surface';
import { toast } from '@blocksuite/affine-components/toast';
import { PanTool } from '@blocksuite/affine-gfx-pointer';
import type { FrameBlockModel } from '@blocksuite/affine-model';
import {
  EditPropsStore,
  ViewportElementProvider,
} from '@blocksuite/affine-shared/services';
import { EdgelessToolbarToolMixin } from '@blocksuite/affine-widget-edgeless-toolbar';
import { Bound, clamp } from '@blocksuite/global/gfx';
import { SignalWatcher } from '@blocksuite/global/lit';
import {
  EndPointArrowIcon,
  ExpandCloseIcon,
  ExpandFullIcon,
  StartPointArrowIcon,
  StopAiIcon,
} from '@blocksuite/icons/lit';
import type { BlockComponent } from '@blocksuite/std';
import type { ToolOptions } from '@blocksuite/std/gfx';
import { effect } from '@preact/signals-core';
import { cssVar } from '@toeverything/theme';
import { css, html, LitElement, nothing, type PropertyValues } from 'lit';
import { property, state } from 'lit/decorators.js';

import {
  EdgelessFrameManagerIdentifier,
  isFrameBlock,
  type NavigatorMode,
} from '../frame-manager';
import { PresentTool } from '../present-tool';

export class PresentationToolbar extends EdgelessToolbarToolMixin(
  SignalWatcher(LitElement)
) {
  static override styles = css`
    :host {
      align-items: inherit;
      width: 100%;
      height: 100%;
      gap: 8px;
      padding-right: 2px;
    }
    .full-divider {
      width: 8px;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .full-divider::after {
      content: '';
      width: 1px;
      height: 100%;
      background: var(--affine-border-color);
      transform: scaleX(0.5);
    }
    .config-buttons {
      display: flex;
      gap: 10px;
    }
    .edgeless-frame-navigator {
      width: 140px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .edgeless-frame-navigator.dense {
      width: auto;
    }

    .edgeless-frame-navigator-title {
      display: inline-block;
      cursor: pointer;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
      padding-right: 8px;
    }

    .edgeless-frame-navigator-count {
      color: var(--affine-text-secondary-color);
      white-space: nowrap;
    }
    .edgeless-frame-navigator-stop {
      border: none;
      cursor: pointer;
      padding: 4px;
      border-radius: 8px;
      position: relative;
      overflow: hidden;

      svg {
        display: block;
        width: 24px;
        height: 24px;
        color: white;
      }
    }
    .edgeless-frame-navigator-stop::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: transparent;
      border-radius: inherit;
    }
    .edgeless-frame-navigator-stop:hover::before {
      background: var(--affine-hover-color);
    }
  `;

  private _cachedIndex = -1;

  private _timer?: ReturnType<typeof setTimeout>;

  override type = PresentTool;

  private get _cachedPresentHideToolbar() {
    return !!this.edgeless.std
      .get(EditPropsStore)
      .getStorage('presentHideToolbar');
  }

  private set _cachedPresentHideToolbar(value) {
    this.edgeless.std
      .get(EditPropsStore)
      .setStorage('presentHideToolbar', !!value);
  }

  private get _frames(): FrameBlockModel[] {
    return this.edgeless.std.get(EdgelessFrameManagerIdentifier).frames;
  }

  get dense() {
    return this.containerWidth < 554;
  }

  get host() {
    return this.edgeless.host;
  }

  get slots() {
    return this.edgeless.std.get(EdgelessLegacySlotIdentifier);
  }

  constructor(edgeless: BlockComponent) {
    super();
    this.edgeless = edgeless;
  }

  private _bindHotKey() {
    const handleKeyIfFrameNavigator = (action: () => void) => () => {
      if (this.edgelessTool.toolType === PresentTool) {
        action();
      }
    };

    this.edgeless.bindHotKey(
      {
        ArrowLeft: handleKeyIfFrameNavigator(() => this._previousFrame()),
        ArrowRight: handleKeyIfFrameNavigator(() => this._nextFrame()),
        Escape: handleKeyIfFrameNavigator(() => this._exitPresentation()),
      },
      {
        global: true,
      }
    );
  }

  private _exitPresentation() {
    // When exit presentation mode, we need to set the tool to default or pan
    // And exit fullscreen
    if (this.edgeless.store.readonly) {
      this.setEdgelessTool(PanTool, { panning: false });
    } else {
      this.setEdgelessTool(DefaultTool);
    }

    if (document.fullscreenElement) {
      document.exitFullscreen().catch(console.error);
    }

    // Reset the flag when fully exiting presentation mode
    this.edgeless.std
      .get(EditPropsStore)
      .setStorage('presentNoFrameToastShown', false);
  }

  private _moveToCurrentFrame(forceMove = false) {
    const currentToolOption = this.gfx.tool.currentToolOption$.value;
    const toolOptions = currentToolOption?.options;

    // If PresentTool is being activated after a temporary pan (indicated by restoredAfterPan)
    // and a forced move isn't explicitly requested, skip moving to the current frame.
    // This preserves the user's panned position instead of resetting to the frame's default view.
    if (
      currentToolOption?.toolType === PresentTool &&
      toolOptions?.restoredAfterPan &&
      !forceMove
    ) {
      // Clear the flag so future navigations behave normally
      // Here we modify the tool's activated option to avoid triggering setTool update
      const currentTool = this.gfx.tool.currentTool$.peek();
      if (currentTool?.activatedOption) {
        currentTool.activatedOption.restoredAfterPan = false;
      }
      return;
    }

    const current = this._currentFrameIndex;
    const viewport = this.gfx.viewport;
    const frame = this._frames[current];

    if (frame) {
      let bound = Bound.deserialize(frame.xywh);

      if (this._navigatorMode === 'fill') {
        const vb = viewport.viewportBounds;
        const center = bound.center;
        let w, h;
        if (vb.w / vb.h > bound.w / bound.h) {
          w = bound.w;
          h = (w * vb.h) / vb.w;
        } else {
          h = bound.h;
          w = (h * vb.w) / vb.h;
        }
        bound = Bound.fromCenter(center, w, h);
      }

      viewport.setViewportByBound(bound, [0, 0, 0, 0], false);
      this.slots.navigatorFrameChanged.next(
        this._frames[this._currentFrameIndex]
      );
    }
  }

  private _nextFrame() {
    const frames = this._frames;
    const min = 0;
    const max = frames.length - 1;
    if (this._currentFrameIndex === frames.length - 1) {
      toast(this.host, 'You have reached the last frame');
    } else {
      this._currentFrameIndex = clamp(this._currentFrameIndex + 1, min, max);
    }
  }

  private _previousFrame() {
    const frames = this._frames;
    const min = 0;
    const max = frames.length - 1;
    if (this._currentFrameIndex === 0) {
      toast(this.host, 'You have reached the first frame');
    } else {
      this._currentFrameIndex = clamp(this._currentFrameIndex - 1, min, max);
    }
  }

  /**
   * Toggle fullscreen, but keep edgeless tool to frameNavigator
   * If already fullscreen, exit fullscreen
   * If not fullscreen, enter fullscreen
   */
  private _toggleFullScreen() {
    if (document.fullscreenElement) {
      document.exitFullscreen().catch(console.error);
      this._fullScreenMode = false;
    } else {
      const { viewportElement } = this.edgeless.std.get(
        ViewportElementProvider
      );
      launchIntoFullscreen(viewportElement);
      this._fullScreenMode = true;
    }
  }

  override connectedCallback(): void {
    super.connectedCallback();

    const { _disposables } = this;

    _disposables.add(
      effect(() => {
        const currentToolOption = this.gfx.tool.currentToolOption$.value;

        if (currentToolOption?.toolType === PresentTool) {
          const opts = currentToolOption.options as
            | ToolOptions<PresentTool>
            | undefined;

          const isAlreadyFullscreen = !!document.fullscreenElement;

          if (!isAlreadyFullscreen) {
            this._toggleFullScreen();
          } else {
            this._fullScreenMode = true;
          }

          this._cachedIndex = this._currentFrameIndex;
          this._navigatorMode = opts?.mode ?? this._navigatorMode;

          const selection = this.gfx.selection;
          if (
            selection.selectedElements.length > 0 &&
            isFrameBlock(selection.selectedElements[0])
          ) {
            const selectedFrameId = selection.selectedElements[0].id;
            const indexOfSelectedFrame = this._frames.findIndex(
              frame => frame.id === selectedFrameId
            );
            if (indexOfSelectedFrame !== -1) {
              this._cachedIndex = indexOfSelectedFrame;
            }
          }

          const store = this.edgeless.std.get(EditPropsStore);
          if (this._frames.length === 0) {
            if (!store.getStorage('presentNoFrameToastShown')) {
              toast(
                this.host,
                'The presentation requires at least 1 frame. You can firstly create a frame.',
                5000
              );
              store.setStorage('presentNoFrameToastShown', true);
            }
          } else {
            // If frames exist, and the flag was set, reset it.
            // This allows the toast to show again if all frames are subsequently deleted.
            if (store.getStorage('presentNoFrameToastShown')) {
              store.setStorage('presentNoFrameToastShown', false);
            }
          }
        }
        this.requestUpdate();
      })
    );
  }

  override firstUpdated() {
    const { _disposables } = this;

    this._bindHotKey();

    _disposables.add(
      this.slots.navigatorSettingUpdated.subscribe(({ fillScreen }) => {
        if (fillScreen !== undefined) {
          this._navigatorMode = fillScreen ? 'fill' : 'fit';
        }
      })
    );

    _disposables.addFromEvent(document, 'fullscreenchange', () => {
      if (document.fullscreenElement) {
        this._timer = setTimeout(() => {
          this._currentFrameIndex = this._cachedIndex;
        }, 400);
      } else {
        clearTimeout(this._timer);
        if (
          this.edgelessTool.toolType === PresentTool &&
          this._fullScreenMode
        ) {
          if (this.edgeless.store.readonly) {
            this.setEdgelessTool(PanTool, { panning: false });
          } else {
            this.setEdgelessTool(DefaultTool);
          }
        }
      }

      setTimeout(() => this._moveToCurrentFrame(true), 400);
      this.slots.fullScreenToggled.next();
    });

    this._navigatorMode =
      this.edgeless.std.get(EditPropsStore).getStorage('presentFillScreen') ===
      true
        ? 'fill'
        : 'fit';
  }

  override render() {
    const current = this._currentFrameIndex;
    const frames = this._frames;
    const frame = frames[current];

    return html`
      <style>
        :host {
          display: flex;
        }
      </style>
      <edgeless-tool-icon-button
        .iconContainerPadding=${0}
        .tooltip=${'Previous'}
        .iconSize=${'24px'}
        @click=${() => this._previousFrame()}
      >
        ${StartPointArrowIcon()}
      </edgeless-tool-icon-button>

      <div class="edgeless-frame-navigator ${this.dense ? 'dense' : ''}">
        ${
          this.dense
            ? nothing
            : html`<span
                style="color: ${cssVar('textPrimaryColor')}"
                class="edgeless-frame-navigator-title"
                @click=${() => this._moveToCurrentFrame()}
              >
                ${frame?.props.title ?? 'no frame'}
              </span>`
        }

        <span class="edgeless-frame-navigator-count">
          ${frames.length === 0 ? 0 : current + 1} / ${frames.length}
        </span>
      </div>

      <edgeless-tool-icon-button
        .tooltip=${'Next'}
        @click=${() => this._nextFrame()}
        .iconContainerPadding=${0}
        .iconSize=${'24px'}
      >
        ${EndPointArrowIcon()}
      </edgeless-tool-icon-button>

      <div class="full-divider"></div>

      <div class="config-buttons">
        <edgeless-tool-icon-button
          .tooltip=${
            document.fullscreenElement
              ? 'Exit Full Screen'
              : 'Enter Full Screen'
          }
          @click=${() => this._toggleFullScreen()}
          .iconContainerPadding=${0}
          .iconContainerWidth=${'24px'}
          .iconSize=${'24px'}
        >
          ${document.fullscreenElement ? ExpandCloseIcon() : ExpandFullIcon()}
        </edgeless-tool-icon-button>

        ${
          this.dense
            ? nothing
            : html`<edgeless-frame-order-button
                .popperShow=${this.frameMenuShow}
                .setPopperShow=${this.setFrameMenuShow}
                .edgeless=${this.edgeless}
              >
              </edgeless-frame-order-button>`
        }

        <edgeless-navigator-setting-button
          .edgeless=${this.edgeless}
          .hideToolbar=${this._cachedPresentHideToolbar}
          .onHideToolbarChange=${(hideToolbar: boolean) => {
            this._cachedPresentHideToolbar = hideToolbar;
          }}
          .popperShow=${this.settingMenuShow}
          .setPopperShow=${this.setSettingMenuShow}
          .includeFrameOrder=${this.dense}
        >
        </edgeless-navigator-setting-button>
      </div>

      <div class="full-divider"></div>

      <button
        class="edgeless-frame-navigator-stop"
        @click=${this._exitPresentation}
        style="background: ${cssVar('warningColor')}"
      >
        ${StopAiIcon()}
      </button>
    `;
  }

  protected override updated(changedProperties: PropertyValues) {
    const currentToolOption = this.gfx.tool.currentToolOption$.value;
    const isPresentToolActive = currentToolOption?.toolType === PresentTool;
    const toolOptions = currentToolOption?.options;
    const isRestoredAfterPan = !!(
      isPresentToolActive && toolOptions?.restoredAfterPan
    );

    if (changedProperties.has('_currentFrameIndex') && isPresentToolActive) {
      // When the current frame index changes (e.g., user navigates), a viewport update is needed.
      // However, if PresentTool is merely being restored after a pan (isRestoredAfterPan = true)
      // without an explicit index change in this update cycle, we avoid forcing a move to preserve the panned position.
      // Thus, `forceMove` is true unless it's a pan restoration.
      const shouldForceMove = !isRestoredAfterPan;
      this._moveToCurrentFrame(shouldForceMove);
    } else if (isPresentToolActive && changedProperties.has('edgelessTool')) {
      // Handles cases where the tool is set/switched to PresentTool (e.g., initial activation or returning from another tool).
      // Similar to frame index changes, avoid forcing a viewport move if restoring after a pan.
      const currentToolIsPresentTool =
        this.edgelessTool.toolType === PresentTool;
      if (currentToolIsPresentTool) {
        const shouldForceMoveOnToolChange = !isRestoredAfterPan;
        this._moveToCurrentFrame(shouldForceMoveOnToolChange);
      }
    }
  }

  @state({
    hasChanged() {
      return true;
    },
  })
  private accessor _currentFrameIndex = 0;

  private accessor _fullScreenMode = true;

  @state()
  private accessor _navigatorMode: NavigatorMode = 'fit';

  @property({ attribute: false })
  accessor containerWidth = 1920;

  @property({ type: Boolean })
  accessor frameMenuShow = false;

  @property()
  accessor setFrameMenuShow: (show: boolean) => void = () => {};

  @property()
  accessor setSettingMenuShow: (show: boolean) => void = () => {};

  @property({ type: Boolean })
  accessor settingMenuShow = false;
}

function launchIntoFullscreen(element: Element) {
  if (element.requestFullscreen) {
    element.requestFullscreen().catch(console.error);
  } else if (
    'mozRequestFullScreen' in element &&
    element.mozRequestFullScreen instanceof Function
  ) {
    // Firefox
    element.mozRequestFullScreen();
  } else if (
    'webkitRequestFullscreen' in element &&
    element.webkitRequestFullscreen instanceof Function
  ) {
    // Chrome, Safari and Opera
    element.webkitRequestFullscreen();
  } else if (
    'msRequestFullscreen' in element &&
    element.msRequestFullscreen instanceof Function
  ) {
    // IE/Edge
    element.msRequestFullscreen();
  }
}