// Copyright (C) 2023 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import m from 'mithril';

import {LegacySelection} from '../common/state';
import {BottomTab} from '../frontend/bottom_tab';

import {DetailsPanel, Tab} from '.';

export function getTrackName(
  args: Partial<{
    name: string | null;
    utid: number | null;
    processName: string | null;
    pid: number | null;
    threadName: string | null;
    tid: number | null;
    upid: number | null;
    userName: string | null;
    uid: number | null;
    kind: string;
    threadTrack: boolean;
    uidTrack: boolean;
  }>,
) {
  const {
    name,
    upid,
    utid,
    processName,
    threadName,
    pid,
    tid,
    userName,
    uid,
    kind,
    threadTrack,
    uidTrack,
  } = args;

  const hasName = name !== undefined && name !== null && name !== '[NULL]';
  const hasUpid = upid !== undefined && upid !== null;
  const hasUtid = utid !== undefined && utid !== null;
  const hasProcessName = processName !== undefined && processName !== null;
  const hasThreadName = threadName !== undefined && threadName !== null;
  const hasUserName = userName !== undefined && userName !== null;
  const hasTid = tid !== undefined && tid !== null;
  const hasPid = pid !== undefined && pid !== null;
  const hasUid = uid !== undefined && uid !== null;
  const hasKind = kind !== undefined;
  const isThreadTrack = threadTrack !== undefined && threadTrack;
  const isUidTrack = uidTrack !== undefined && uidTrack;

  // If we don't have any useful information (better than
  // upid/utid) we show the track kind to help with tracking
  // down where this is coming from.
  const kindSuffix = hasKind ? ` (${kind})` : '';

  if (isThreadTrack && hasName && hasTid) {
    return `${name} (${tid})`;
  } else if (isUidTrack && hasName && hasUserName) {
    return `${name} (${userName})`;
  } else if (isUidTrack && hasName && hasUid) {
    return `${name} ${uid}`;
  } else if (hasName) {
    return `${name}`;
  } else if (hasUpid && hasPid && hasProcessName) {
    return `${processName} ${pid}`;
  } else if (hasUpid && hasPid) {
    return `Process ${pid}`;
  } else if (hasThreadName && hasTid) {
    return `${threadName} ${tid}`;
  } else if (hasTid) {
    return `Thread ${tid}`;
  } else if (hasUpid) {
    return `upid: ${upid}${kindSuffix}`;
  } else if (hasUtid) {
    return `utid: ${utid}${kindSuffix}`;
  } else if (hasUid) {
    return `uid: ${uid}${kindSuffix}`;
  } else if (hasKind) {
    return `Unnamed ${kind}`;
  }
  return 'Unknown';
}

export interface BottomTabAdapterAttrs {
  tabFactory: (sel: LegacySelection) => BottomTab | undefined;
}

/**
 * This adapter wraps a BottomTab, converting it into a the new "current
 * selection" API.
 * This adapter is required because most bottom tab implementations expect to
 * be created when the selection changes, however current selection sections
 * stick around in memory forever and produce a section only when they detect a
 * relevant selection.
 * This adapter, given a bottom tab factory function, will simply call the
 * factory function whenever the selection changes. It's up to the implementer
 * to work out whether the selection is relevant and to construct a bottom tab.
 *
 * @example
 * new BottomTabAdapter({
      tabFactory: (sel) => {
        if (sel.kind !== 'CHROME_SLICE') {
          return undefined;
        }
        return new ChromeSliceDetailsTab({
          config: {
            table: sel.table ?? 'slice',
            id: sel.id,
          },
          engine: ctx.engine,
          uuid: uuidv4(),
        });
      },
    })
 */
export class BottomTabToSCSAdapter implements DetailsPanel {
  private oldSelection?: LegacySelection;
  private bottomTab?: BottomTab;
  private attrs: BottomTabAdapterAttrs;

  constructor(attrs: BottomTabAdapterAttrs) {
    this.attrs = attrs;
  }

  render(selection: LegacySelection): m.Children {
    // Detect selection changes, assuming selection is immutable
    if (selection !== this.oldSelection) {
      this.oldSelection = selection;
      this.bottomTab = this.attrs.tabFactory(selection);
    }

    return this.bottomTab?.renderPanel();
  }

  // Note: Must be called after render()
  isLoading(): boolean {
    return this.bottomTab?.isLoading() ?? false;
  }
}

/**
 * This adapter wraps a BottomTab, converting it to work with the Tab API.
 */
export class BottomTabToTabAdapter implements Tab {
  constructor(private bottomTab: BottomTab) {}

  getTitle(): string {
    return this.bottomTab.getTitle();
  }

  render(): m.Children {
    return this.bottomTab.viewTab();
  }
}