/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * 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 { Theme } from '@ohos.arkui.theme';
import { LengthMetrics, LengthUnit } from '@ohos.arkui.node';

const EMPTY_STRING: string = '';
const MAX_PROGRESS: number = 100;
const MAX_PERCENTAGE: string = '100%';
const MIN_PERCENTAGE: string = '0%';
const TEXT_OPACITY: number = 0.4;
const BUTTON_NORMARL_WIDTH: number = 44;
const BUTTON_NORMARL_HEIGHT: number = 28;
const BUTTON_BORDER_RADIUS: number = 14;
const TEXT_ENABLE: number = 1.0;


// Set the key value for the basic component of skin changing corresponding to progressButton
const PROGRESS_BUTTON_PROGRESS_KEY = 'progress_button_progress_key';
const PROGRESS_BUTTON_PRIMARY_FONT_KEY = 'progress_button_primary_font_key';
const PROGRESS_BUTTON_CONTAINER_BACKGROUND_COLOR_KEY = 'progress_button_container_background_color_key';
const PROGRESS_BUTTON_EMPHASIZE_SECONDARY_BUTTON_KEY = 'progress_button_emphasize_secondary_button_key';

@ComponentV2
export struct ProgressButtonV2 {
  @Param @Require progress: number;
  @Param content: ResourceStr = EMPTY_STRING;
  @Param @Once progressButtonWidth?: LengthMetrics = LengthMetrics.vp(BUTTON_NORMARL_WIDTH);
  @Param onClicked: ClickCallback = () => {
  };
  @Param isEnabled: boolean = true;
  @Param colorOptions?: ProgressButtonV2Color | undefined = undefined;
  @Param progressButtonRadius?: LengthMetrics | undefined = undefined;
  @Local textProgress: string = EMPTY_STRING;
  @Local isLoading: boolean = false;
  @Local progressColor: ResourceColor = '#330A59F7'
  @Local containerBorderColor: ResourceColor = '#330A59F7'
  @Local containerBackgroundColor: ResourceColor = $r('sys.color.ohos_id_color_foreground_contrary')
  @Local textHeight?: Length = BUTTON_NORMARL_HEIGHT;
  @Local buttonBorderRadius?: number = BUTTON_BORDER_RADIUS;

  onWillApplyTheme(theme: Theme) {
    this.progressColor = theme.colors.compEmphasizeSecondary;
    this.containerBorderColor = theme.colors.compEmphasizeSecondary;
    this.containerBackgroundColor = theme.colors.iconOnFourth;
  }

  private getButtonProgress(): number {
    if (this.progress < 0) {
      return 0;
    } else if (this.progress > MAX_PROGRESS) {
      return MAX_PROGRESS;
    }
    return this.progress;
  }

  @Monitor('progress')
  private getProgressContext() {
    if (this.progress < 0) {
      this.isLoading = false;
      this.textProgress = MIN_PERCENTAGE;
    } else if (this.progress >= MAX_PROGRESS) {
      this.isLoading = false;
      this.textProgress = MAX_PERCENTAGE;
    } else {
      this.isLoading = true;
      this.textProgress = `${Math.floor(this.progress / MAX_PROGRESS * MAX_PROGRESS)}%`;
    }
  }

  @Monitor('isLoading')
  private getLoadingProgress() {
    if (this.isLoading) {
      if (this.progress < 0) {
        this.textProgress = MIN_PERCENTAGE;
      } else if (this.progress >= MAX_PROGRESS) {
        this.textProgress = MAX_PERCENTAGE;
      } else {
        this.textProgress = `${Math.floor(this.progress / MAX_PROGRESS * MAX_PROGRESS)}%`;
      }
    }
  }

  private getProgressButtonRadius(): LengthMetrics {
    if (!this.progressButtonRadius || this.progressButtonRadius.unit === LengthUnit.PERCENT) {
      return LengthMetrics.vp(this.buttonBorderRadius);
    } else if (this.progressButtonRadius.value < 0) {
      return LengthMetrics.vp(0);
    } else {
      return this.progressButtonRadius;
    }
  }

  build() {
    Button() {
      Stack() {
        Progress({
          value: this.getButtonProgress(), total: MAX_PROGRESS,
          style: ProgressStyle.Capsule
        })
          .height(this.textHeight)
          .constraintSize({ minHeight: BUTTON_NORMARL_HEIGHT })
          .borderRadius(this.buttonBorderRadius)
          .width('100%')
          .hoverEffect(HoverEffect.None)
          .style({
            borderColor: this.colorOptions?.borderColor?.color ?
              this.colorOptions?.borderColor?.color : this.containerBorderColor,
            borderRadius: this.getProgressButtonRadius()
          })
          .clip(false)
          .enabled(this.isEnabled)
          .key(PROGRESS_BUTTON_PROGRESS_KEY)
          .color(this.colorOptions?.progressColor?.color ? this.colorOptions?.progressColor?.color : this.progressColor)
        Row() {
          Text(this.isLoading ? this.textProgress : this.content)
            .fontSize($r('sys.float.ohos_id_text_size_button3'))
            .fontWeight(FontWeight.Medium)
            .key(PROGRESS_BUTTON_PRIMARY_FONT_KEY)
            .fontColor(this.colorOptions?.textColor?.color)
            .maxLines(1)
            .textOverflow({ overflow: TextOverflow.Ellipsis })
            .padding({
              top: 4,
              left: 8,
              right: 8,
              bottom: 4
            })
            .opacity(this.isEnabled ? TEXT_ENABLE : TEXT_OPACITY)
            .onSizeChange((_, newValue) => {
              if (!newValue.height || newValue.height === this.textHeight) {
                return;
              }
              this.textHeight = newValue.height > BUTTON_NORMARL_HEIGHT ? newValue.height : BUTTON_NORMARL_HEIGHT;
              this.buttonBorderRadius = Number(this.textHeight) / 2;
            })
        }
        .constraintSize({ minHeight: BUTTON_NORMARL_HEIGHT })

        Row()
          .key(PROGRESS_BUTTON_CONTAINER_BACKGROUND_COLOR_KEY)
          .backgroundColor(Color.Transparent)
          .border({
            width: 1,
            color: this.colorOptions?.borderColor?.color ?
              this.colorOptions?.borderColor?.color : this.containerBorderColor
          })
          .height(this.textHeight)
          .constraintSize({ minHeight: BUTTON_NORMARL_HEIGHT })
          .borderRadius(this.progressButtonRadius ? this.toLengthString(this.getProgressButtonRadius()) :
          this.buttonBorderRadius)
          .width('100%')
      }
    }
    .borderRadius(this.progressButtonRadius ? this.toLengthString(this.getProgressButtonRadius()) :
    this.buttonBorderRadius)
    .clip(false)
    .hoverEffect(HoverEffect.None)
    .key(PROGRESS_BUTTON_EMPHASIZE_SECONDARY_BUTTON_KEY)
    .backgroundColor(
      this.colorOptions?.backgroundColor?.color
        ? this.colorOptions?.backgroundColor?.color
        : this.containerBackgroundColor)
    .padding({ top: 0, bottom: 0 })
    .width((!this.progressButtonWidth || this.progressButtonWidth.value < 0) ?
      BUTTON_NORMARL_WIDTH : this.toLengthString(this.progressButtonWidth))
    .constraintSize({ minWidth: BUTTON_NORMARL_WIDTH })
    .stateEffect(this.isEnabled)
    .onClick(() => {
      if (!this.isEnabled) {
        return;
      }
      if (this.progress < MAX_PROGRESS) {
        this.isLoading = !this.isLoading;
      }
      this.onClicked?.();
    })
  }

  private toLengthString(value: LengthMetrics | undefined): string {
    if (value === void (0)) {
      return '';
    }
    const length: number = value.value;
    switch (value.unit) {
      case LengthUnit.PX:
        return `${length}px`;
      case LengthUnit.FP:
        return `${length}fp`;
      case LengthUnit.LPX:
        return `${length}lpx`;
      case LengthUnit.PERCENT:
        return `${length * 100}%`;
      case LengthUnit.VP:
        return `${length}vp`;
      default:
        return `${length}vp`;
    }
  }
}

@ObservedV2
export class ProgressButtonV2Color {
  @Trace public progressColor?: ColorMetrics;
  @Trace public borderColor?: ColorMetrics;
  @Trace public textColor?: ColorMetrics;
  @Trace public backgroundColor?: ColorMetrics;

  constructor(options: ProgressButtonV2ColorOptions) {
    this.progressColor = options.progressColor;
    this.borderColor = options.borderColor;
    this.textColor = options.textColor;
    this.backgroundColor = options.backgroundColor;
  }
}

export type ClickCallback = () => void;

export interface ProgressButtonV2ColorOptions {
  progressColor?: ColorMetrics;
  borderColor?: ColorMetrics;
  textColor?: ColorMetrics;
  backgroundColor?: ColorMetrics;
}