// @flow
import { NativeModules } from 'react-native';
import processColor from 'react-native/Libraries/StyleSheet/processColor';

import type { ColorValue } from 'react-native/Libraries/StyleSheet/StyleSheetTypes';

type IdKey = string | 'id';
type LabelKey = string | 'label';
type ListItem = { label: string, id?: any };

type OptionsAlert = {|
  ...OptionsCommon,
|};

type OptionsCommon = {|
  title?: null | string,
  titleColor?: ColorValue,
  content?: null | string,
  contentIsHtml?: boolean,
  contentColor?: string,
  positiveText?: string, // default "OK"
  negativeText?: string,
  neutralText?: string,
  positiveColor?: ColorValue,
  negativeColor?: ColorValue,
  neutralColor?: ColorValue,
  backgroundColor?: ColorValue,
  cancelable?: boolean,
  linkColor?: ColorValue, // applies if contentIsHtml is true, and there are <a> elements in content string
  forceStacking?: boolean,
  checkboxLabel?: string,
  checkboxDefaultValue?: boolean,
|};

type ListItemJustLabel = { label: string };
type ListItemJustId = { id: string };
type ListItemFull = { label: string, id: any };
type ListItemBare = {};

type OptionsRadioList = {|
  maxNumberOfItems?: number,
  type: typeof ListType.listRadio,
  widgetColor?: ColorValue, // radio color
|};
type OptionsCheckboxList = {|
  maxNumberOfItems?: number,
  type: typeof ListType.listCheckbox,
  neutralIsClear?: boolean,
  widgetColor?: ColorValue, // checkbox color
|};

type OptionsPicker =
  | {|
      ...OptionsCommon,
      type?: typeof ListType.listPlain,
      maxNumberOfItems?: number,
      items: ListItemJustLabel[],
    |}
  | {|
      ...OptionsCommon,
      type?: typeof ListType.listPlain,
      maxNumberOfItems?: number,
      items: ListItemBare[],
      labelKey: string,
    |}
  | {|
      // radio - no preselected
      ...OptionsCommon,
      ...OptionsRadioList,
      items: ListItemJustLabel[],
    |}
  | {|
      // radio - no preselected
      ...OptionsCommon,
      ...OptionsRadioList,
      items: ListItemBare[],
      labelKey: string,
    |}
  | {|
      // radio - preselected - ListItemFull
      ...OptionsCommon,
      ...OptionsRadioList,
      items: ListItemFull[],
      selectedId: any,
    |}
  | {|
      // radio - preselected - ListItemJustlabel
      ...OptionsCommon,
      ...OptionsRadioList,
      items: ListItemJustLabel[],
      idKey: string,
      selectedId: any,
    |}
  | {|
      // radio - preselected - ListItemJustId
      ...OptionsCommon,
      ...OptionsRadioList,
      items: ListItemJustId[],
      labelKey: string,
      selectedId: any,
    |}
  | {|
      // radio - preselected - ListItemBare
      ...OptionsCommon,
      ...OptionsRadioList,
      items: ListItemBare[],
      idKey: string,
      labelKey: string,
      selectedId: any,
    |}
  | {|
      // checklist - no preselected - ListItemJustLabel
      ...OptionsCommon,
      ...OptionsCheckboxList,
      items: ListItemJustLabel[],
    |}
  | {|
      // checklist - no preselected - ListItemBare
      ...OptionsCommon,
      ...OptionsCheckboxList,
      items: ListItemBare[],
      labelKey: string,
    |}
  | {|
      // checklist - preselected - ListItemFull
      ...OptionsCommon,
      ...OptionsCheckboxList,
      items: ListItemFull[],
      selectedIds: any[],
    |}
  | {|
      // checklist - preselected - ListItemJustlabel
      ...OptionsCommon,
      ...OptionsCheckboxList,
      items: ListItemJustLabel[],
      idKey: string,
      selectedIds: any,
    |}
  | {|
      // checklist - preselected - ListItemJustId
      ...OptionsCommon,
      ...OptionsCheckboxList,
      items: ListItemJustId[],
      labelKey: string,
      selectedIds: any,
    |}
  | {|
      // checklist - preselected - ListItemBare
      ...OptionsCommon,
      ...OptionsCheckboxList,
      items: ListItemBare[],
      idKey: string,
      labelKey: string,
      selectedIds: any,
    |};

type ListType =
  | typeof DialogAndroid.listCheckbox
  | typeof DialogAndroid.listPlain
  | typeof DialogAndroid.listRadio;

type ActionType =
  | typeof DialogAndroid.actionDismiss
  | typeof DialogAndroid.actionNegative
  | typeof DialogAndroid.actionNeutral
  | typeof DialogAndroid.actionPositive
  | typeof DialogAndroid.actionSelect;

type Options = OptionsAlert | OptionsPicker | OptionsProgress | OptionsPrompt;

type OptionsProgress = {|
  contentColor?: $PropertyType<OptionsCommon, 'contentColor'>,
  contentIsHtml?: $PropertyType<OptionsCommon, 'contentIsHtml'>,
  linkColor?: $PropertyType<OptionsCommon, 'linkColor'>,
  style?: ProgressStyle,
  title?: $PropertyType<OptionsCommon, 'title'>,
  titleColor?: $PropertyType<OptionsCommon, 'titleColor'>,
  widgetColor?: $PropertyType<OptionsCommon, 'widgetColor'>,
|};

type ProgressStyle = typeof DialogAndroid.progressHorizontal;

type OptionsPrompt = {|
  ...OptionsCommon,
  keyboardType?:
    | 'numeric'
    | 'number-pad'
    | 'decimal-pad'
    | 'numeric-password'
    | 'email-address'
    | 'password'
    | 'phone-pad'
    | 'url',
  defaultValue?: string,
  placeholder?: string,
  allowEmptyInput?: boolean,
  minLength?: number,
  maxLength?: number,
|};

type Title = void | null | string;
type Content = void | null | string;

type NativeConfig = {|
  ...OptionsCommon,
  items: string[],
  widgetColor?: ColorValue,
  selectedIndices?: number[],
  selectedIndex?: number[],
  progress?: {
    indeterminate: true,
    style?: 'horizontal',
  },
|};

function processColors(nativeConfig: {}) {
  for (const prop of Object.keys(nativeConfig)) {
    if (prop.endsWith('Color')) {
      nativeConfig[prop] = processColor(nativeConfig[prop]);
    }
  }
}

function pick(source, ...keys) {
  const target = {};
  for (const key of keys) {
    if (source.hasOwnProperty(key)) {
      target[key] = source[key];
    }
  }
  return target;
}

class DialogAndroid {
  static listPlain = 'listPlain';
  static listRadio = 'listRadio';
  static listCheckbox = 'listCheckbox';
  static actionDismiss = 'actionDismiss';
  static actionNegative = 'actionNegative';
  static actionNeutral = 'actionNeutral';
  static actionPositive = 'actionPositive';
  static actionSelect = 'actionSelect';
  static progressHorizontal = 'progressHorizontal';

  static defaults = {
    positiveText: 'OK',
  };

  static dismiss(): void {
    NativeModules.DialogAndroid.dismiss();
  }

  static assignDefaults(defaults: {
    title?: Title,
    content?: Content,
    ...Options,
  }): void {
    Object.assign(DialogAndroid.defaults, defaults);
  }

  static alert(
    title: Title,
    content: Content,
    options?: OptionsAlert = {}
  ): Promise<
    | {|
        action:
          | typeof DialogAndroid.actionPositive
          | typeof DialogAndroid.actionNegative
          | typeof DialogAndroid.actionNeutral
          | typeof DialogAndroid.actionDismiss,
      |}
    | {|
        action:
          | typeof DialogAndroid.actionPositive
          | typeof DialogAndroid.actionNegative
          | typeof DialogAndroid.actionNeutral,
        checked: boolean,
      |}
  > {
    return new Promise((resolve, reject) => {
      const nativeConfig: NativeConfig = {
        ...DialogAndroid.defaults,
        ...options,
        onAny: true,
        dismissListener: true,
      };
      if (title) nativeConfig.title = title;
      if (content) nativeConfig.content = content;

      processColors(nativeConfig);

      NativeModules.DialogAndroid.show(
        nativeConfig,
        (kind: string, ...rest) => {
          switch (kind) {
            case 'error': {
              const [error, nativeConfig] = rest;
              return reject(
                `DialogAndroid ${error}. nativeConfig: ${nativeConfig}`
              );
            }
            case 'dismissListener': {
              return resolve({
                action: DialogAndroid.actionDismiss,
              });
            }
            case 'onAny': {
              const [dialogAction, checked] = rest;
              switch (dialogAction) {
                case 0:
                  return resolve({
                    action: DialogAndroid.actionPositive,
                    ...getChecked(nativeConfig, checked),
                  });
                case 1:
                  return resolve({
                    action: DialogAndroid.actionNeutral,
                    ...getChecked(nativeConfig, checked),
                  });
                case 2:
                  return resolve({
                    action: DialogAndroid.actionNegative,
                    ...getChecked(nativeConfig, checked),
                  });
              }
            }
            default: {
              return reject(`Unknown callback kind: "${kind}"`);
            }
          }
        }
      );
    });
  }

  static showPicker(
    title: Title,
    content: Content,
    options: OptionsPicker
  ): Promise<
    | {|
        action:
          | typeof DialogAndroid.actionNegative
          | typeof DialogAndroid.actionNeutral
          | typeof DialogAndroid.actionDismiss,
      |}
    | {|
        action:
          | typeof DialogAndroid.actionNegative
          | typeof DialogAndroid.actionNeutral,
        checked: boolean,
      |}
    | {|
        action: typeof DialogAndroid.actionSelect,
        selectedItem: ListItem,
      |}
    | {|
        action: typeof DialogAndroid.actionSelect,
        selectedItem: ListItem,
        checked: boolean,
      |}
    | {|
        action: typeof DialogAndroid.actionSelect,
        selectedItems: ListItem[],
      |}
    | {|
        action: typeof DialogAndroid.actionSelect,
        selectedItems: ListItem[],
        checked: boolean,
      |}
  > {
    // options is required, must defined items

    return new Promise((resolve, reject) => {
      const {
        idKey = 'id',
        items,
        labelKey = 'label',
        type,
        neutralIsClear,
        selectedId,
        selectedIds,
        ...filteredOptions
      } = options;

      const nativeConfig: NativeConfig = {
        ...DialogAndroid.defaults,
        ...filteredOptions,
        onAny: true,
        dismissListener: true,
      };
      if (title) nativeConfig.title = title;
      if (content) nativeConfig.content = content;

      if (items) {
        nativeConfig.items = items.map(item => item[labelKey]);
        switch (type) {
          case DialogAndroid.listCheckbox: {
            nativeConfig.itemsCallbackMultiChoice = true;
            if (selectedIds) {
              nativeConfig.selectedIndices = selectedIds.map(id =>
                items.findIndex(item => item[idKey] === id)
              );
            }
            break;
          }
          case DialogAndroid.listRadio: {
            nativeConfig.itemsCallbackSingleChoice = true;
            if (selectedId !== undefined) {
              nativeConfig.selectedIndex = items.findIndex(
                item => item[idKey] === selectedId
              );
            }
            break;
          }
          default:
            nativeConfig.itemsCallback = true;
        }
      }

      if (neutralIsClear) nativeConfig.multiChoiceClearButton = true;

      processColors(nativeConfig);

      NativeModules.DialogAndroid.show(
        nativeConfig,
        (kind: string, ...rest) => {
          switch (kind) {
            case 'error': {
              const [error, nativeConfig] = rest;
              return reject(
                `DialogAndroid ${error}. nativeConfig: ${nativeConfig}`
              );
            }
            case 'itemsCallbackMultiChoice': {
              const [selectedIndicesString, checked] = rest; // blank string when nothing selected
              const selectedItems =
                selectedIndicesString === ''
                  ? []
                  : selectedIndicesString.split(',').map(index => items[index]);

              return resolve({
                action: DialogAndroid.actionPositive,
                selectedItems,
                ...getChecked(nativeConfig, checked),
              });
            }
            case 'itemsCallback':
            case 'itemsCallbackSingleChoice': {
              const [selectedIndex, checked] = rest;
              const selectedItem = items[selectedIndex];
              return resolve({
                action: DialogAndroid.actionSelect,
                selectedItem,
                ...getChecked(nativeConfig, checked),
              });
            }
            case 'onAny': {
              const [dialogAction, checked] = rest;
              switch (dialogAction) {
                case 0:
                  return resolve({
                    action: DialogAndroid.actionPositive,
                    ...getChecked(nativeConfig, checked),
                  });
                case 1:
                  return resolve({
                    action: DialogAndroid.actionNeutral,
                    ...getChecked(nativeConfig, checked),
                  });
                case 2:
                  return resolve({
                    action: DialogAndroid.actionNegative,
                    ...getChecked(nativeConfig, checked),
                  });
              }
            }
            case 'dismissListener': {
              return resolve({
                action: DialogAndroid.actionDismiss,
              });
            }
            default: {
              return reject(`Unknown callback kind: "${kind}"`);
            }
          }
        }
      );
    });
  }

  static showProgress(
    content: string,
    options?: OptionsProgress = {}
  ): Promise<{|
    action: typeof DialogAndroid.actionDismiss,
  |}> {
    return new Promise((resolve, reject) => {
      const defaults = pick(
        DialogAndroid.defaults,
        'contentColor',
        'contentIsHtml',
        'linkColor',
        'title',
        'widgetColor',
        'titleColor'
      );

      const { style, ...finalOptions } = options;

      const nativeConfig = {
        ...defaults,
        progress: {
          indeterminate: true,
          style:
            style === DialogAndroid.progressHorizontal
              ? 'horizontal'
              : undefined,
        },
        cancelable: false,
        ...finalOptions,
        dismissListener: true,
      };
      if (content) nativeConfig.content = content;
      if (content && style !== DialogAndroid.progressHorizontal)
        nativeConfig.content = '     ' + content;
      processColors(nativeConfig);

      NativeModules.DialogAndroid.show(
        nativeConfig,
        (kind: string, ...rest) => {
          switch (kind) {
            case 'error': {
              const [error, nativeConfig] = rest;
              return reject(
                `DialogAndroid ${error}. nativeConfig: ${nativeConfig}`
              );
            }
            case 'dismissListener': {
              return resolve({
                action: DialogAndroid.actionDismiss,
              });
            }
          }
        }
      );
    });
  }

  static prompt(
    title: Title,
    content: Content,
    options?: OptionsPrompt = {}
  ): Promise<
    | {|
        action:
          | typeof DialogAndroid.actionNegative
          | typeof DialogAndroid.actionNeutral
          | typeof DialogAndroid.actionDismiss,
      |}
    | {|
        action:
          | typeof DialogAndroid.actionNegative
          | typeof DialogAndroid.actionNeutral,
        checked: boolean,
      |}
    | {| action: typeof DialogAndroid.actionPositive, text: string |}
    | {|
        action: typeof DialogAndroid.actionPositive,
        text: string,
        checked: boolean,
      |}
  > {
    return new Promise((resolve, reject) => {
      const {
        keyboardType,
        defaultValue,
        placeholder,
        allowEmptyInput,
        minLength,
        maxLength,
        ...finalOptions
      } = options;

      const inputConfig = {};
      if (defaultValue) inputConfig.prefill = defaultValue;
      if (placeholder) inputConfig.hint = placeholder;
      if (allowEmptyInput !== undefined)
        inputConfig.allowEmptyInput = allowEmptyInput;
      if (minLength) inputConfig.minLength = minLength;
      if (maxLength) inputConfig.maxLength = maxLength;
      if (keyboardType) inputConfig.keyboardType = keyboardType;

      const nativeConfig = {
        ...DialogAndroid.defaults,
        input: inputConfig,
        ...finalOptions,
        onAny: true,
        dismissListener: true,
      };
      if (title) nativeConfig.title = title;
      if (content) nativeConfig.content = content;

      processColors(nativeConfig);

      NativeModules.DialogAndroid.show(
        nativeConfig,
        (kind: string, ...rest) => {
          switch (kind) {
            case 'error': {
              const [error, nativeConfig] = rest;
              return reject(
                `DialogAndroid ${error}. nativeConfig: ${nativeConfig}`
              );
            }
            case 'onAny': {
              const [dialogAction, checked] = rest;
              switch (dialogAction) {
                case 1:
                  return resolve({
                    action: DialogAndroid.actionNeutral,
                    ...getChecked(nativeConfig, checked),
                  });
                case 2:
                  return resolve({
                    action: DialogAndroid.actionNegative,
                    ...getChecked(nativeConfig, checked),
                  });
              }
            }
            case 'input': {
              const [text, checked] = rest;
              return resolve({
                action: DialogAndroid.actionPositive,
                text,
                ...getChecked(nativeConfig, checked),
              });
            }
            case 'dismissListener': {
              return resolve({
                action: DialogAndroid.actionDismiss,
              });
            }
            case 'cancelListener': {
              // fires when input text field is there and hit back or in back to dismiss
              return resolve({
                action: DialogAndroid.actionDismiss,
              });
            }
            default: {
              return reject(`Unknown callback kind: "${kind}"`);
            }
          }
        }
      );
    });
  }
}

function getChecked(nativeConfig, checked) {
  return nativeConfig.checkboxLabel ? { checked } : {};
}

export default DialogAndroid;