import React from "react";
import {
  CommandBar,
  ICommandBarItemProps,
  IStackTokens,
  MessageBar,
  MessageBarType,
  Spinner,
  SpinnerSize,
  Stack,
} from "office-ui-fabric-react";
import {
  AnyDisplay,
  Node,
  InputType,
  RefreshResult,
  SelfServeDescriptor,
  SelfServeNotification,
  SmartUiInput,
  DescriptionDisplay,
  StringInput,
  NumberInput,
  BooleanInput,
  ChoiceInput,
  SelfServeNotificationType,
} from "./SelfServeTypes";
import { SmartUiComponent, SmartUiDescriptor } from "../Explorer/Controls/SmartUi/SmartUiComponent";
import { getMessageBarType } from "./SelfServeUtils";
import { Translation } from "react-i18next";
import { TFunction } from "i18next";
import "../i18n";

export interface SelfServeComponentProps {
  descriptor: SelfServeDescriptor;
}

export interface SelfServeComponentState {
  root: SelfServeDescriptor;
  currentValues: Map<string, SmartUiInput>;
  baselineValues: Map<string, SmartUiInput>;
  isInitializing: boolean;
  hasErrors: boolean;
  compileErrorMessage: string;
  notification: SelfServeNotification;
  refreshResult: RefreshResult;
}

export class SelfServeComponent extends React.Component<SelfServeComponentProps, SelfServeComponentState> {
  private smartUiGeneratorClassName: string;

  componentDidMount(): void {
    this.performRefresh();
    this.initializeSmartUiComponent();
  }

  constructor(props: SelfServeComponentProps) {
    super(props);
    this.state = {
      root: this.props.descriptor,
      currentValues: new Map(),
      baselineValues: new Map(),
      isInitializing: true,
      hasErrors: false,
      compileErrorMessage: undefined,
      notification: undefined,
      refreshResult: undefined,
    };
    this.smartUiGeneratorClassName = this.props.descriptor.root.id;
  }

  private onError = (hasErrors: boolean): void => {
    this.setState({ hasErrors });
  };

  private initializeSmartUiComponent = async (): Promise<void> => {
    this.setState({ isInitializing: true });
    await this.setDefaults();
    const { currentValues, baselineValues } = this.state;
    await this.initializeSmartUiNode(this.props.descriptor.root, currentValues, baselineValues);
    this.setState({ isInitializing: false, currentValues, baselineValues });
  };

  private setDefaults = async (): Promise<void> => {
    let { currentValues, baselineValues } = this.state;

    const initialValues = await this.props.descriptor.initialize();
    this.props.descriptor.inputNames.map((inputName) => {
      let initialValue = initialValues.get(inputName);
      if (!initialValue) {
        initialValue = { value: undefined, hidden: false };
      }
      currentValues = currentValues.set(inputName, initialValue);
      baselineValues = baselineValues.set(inputName, initialValue);
      initialValues.delete(inputName);
    });

    if (initialValues.size > 0) {
      const keys = [];
      for (const key of initialValues.keys()) {
        keys.push(key);
      }

      this.setState({
        compileErrorMessage: `The following fields have default values set but are not input properties of this class: ${keys.join(
          ", "
        )}`,
      });
    }
    this.setState({ currentValues, baselineValues });
  };

  public resetBaselineValues = (): void => {
    const currentValues = this.state.currentValues;
    let baselineValues = this.state.baselineValues;
    for (const key of currentValues.keys()) {
      const currentValue = currentValues.get(key);
      baselineValues = baselineValues.set(key, { ...currentValue });
    }
    this.setState({ baselineValues });
  };

  public discard = (): void => {
    let { currentValues } = this.state;
    const { baselineValues } = this.state;
    for (const key of currentValues.keys()) {
      const baselineValue = baselineValues.get(key);
      currentValues = currentValues.set(key, { ...baselineValue });
    }
    this.setState({ currentValues });
  };

  private initializeSmartUiNode = async (
    currentNode: Node,
    currentValues: Map<string, SmartUiInput>,
    baselineValues: Map<string, SmartUiInput>
  ): Promise<void> => {
    currentNode.info = await this.getResolvedValue(currentNode.info);

    if (currentNode.input) {
      currentNode.input = await this.getResolvedInput(currentNode.input, currentValues, baselineValues);
    }

    const promises = currentNode.children?.map(
      async (child: Node) => await this.initializeSmartUiNode(child, currentValues, baselineValues)
    );
    if (promises) {
      await Promise.all(promises);
    }
  };

  private getResolvedInput = async (
    input: AnyDisplay,
    currentValues: Map<string, SmartUiInput>,
    baselineValues: Map<string, SmartUiInput>
  ): Promise<AnyDisplay> => {
    input.labelTKey = await this.getResolvedValue(input.labelTKey);
    input.placeholderTKey = await this.getResolvedValue(input.placeholderTKey);

    switch (input.type) {
      case "string": {
        if ("description" in input) {
          const descriptionDisplay = input as DescriptionDisplay;
          descriptionDisplay.description = await this.getResolvedValue(descriptionDisplay.description);
        }
        return input as StringInput;
      }
      case "number": {
        const numberInput = input as NumberInput;
        numberInput.min = await this.getResolvedValue(numberInput.min);
        numberInput.max = await this.getResolvedValue(numberInput.max);
        numberInput.step = await this.getResolvedValue(numberInput.step);

        const dataFieldName = numberInput.dataFieldName;
        const defaultValue = currentValues.get(dataFieldName)?.value;

        if (!defaultValue) {
          const newDefaultValue = { value: numberInput.min, hidden: currentValues.get(dataFieldName)?.hidden };
          currentValues.set(dataFieldName, newDefaultValue);
          baselineValues.set(dataFieldName, newDefaultValue);
        }

        return numberInput;
      }
      case "boolean": {
        const booleanInput = input as BooleanInput;
        booleanInput.trueLabelTKey = await this.getResolvedValue(booleanInput.trueLabelTKey);
        booleanInput.falseLabelTKey = await this.getResolvedValue(booleanInput.falseLabelTKey);
        return booleanInput;
      }
      default: {
        const choiceInput = input as ChoiceInput;
        choiceInput.choices = await this.getResolvedValue(choiceInput.choices);
        return choiceInput;
      }
    }
  };

  public async getResolvedValue<T>(value: T | (() => Promise<T>)): Promise<T> {
    if (value instanceof Function) {
      return value();
    }
    return value;
  }

  private onInputChange = (input: AnyDisplay, newValue: InputType) => {
    if (input.onChange) {
      const newValues = input.onChange(this.state.currentValues, newValue);
      this.setState({ currentValues: newValues });
    } else {
      const dataFieldName = input.dataFieldName;
      const { currentValues } = this.state;
      const currentInputValue = currentValues.get(dataFieldName);
      currentValues.set(dataFieldName, { value: newValue, hidden: currentInputValue?.hidden });
      this.setState({ currentValues });
    }
  };

  public onSaveButtonClick = (): void => {
    const onSavePromise = this.props.descriptor.onSave(this.state.currentValues);
    onSavePromise.catch((error) => {
      this.setState({
        notification: {
          message: `${error.message}`,
          type: SelfServeNotificationType.error,
        },
      });
    });
    onSavePromise.then((notification: SelfServeNotification) => {
      this.setState({
        notification: {
          message: notification.message,
          type: notification.type,
        },
      });
      this.resetBaselineValues();
      this.onRefreshClicked();
    });
  };

  public isDiscardButtonDisabled = (): boolean => {
    for (const key of this.state.currentValues.keys()) {
      const currentValue = JSON.stringify(this.state.currentValues.get(key));
      const baselineValue = JSON.stringify(this.state.baselineValues.get(key));

      if (currentValue !== baselineValue) {
        return false;
      }
    }
    return true;
  };

  public isSaveButtonDisabled = (): boolean => {
    if (this.state.hasErrors) {
      return true;
    }
    for (const key of this.state.currentValues.keys()) {
      const currentValue = JSON.stringify(this.state.currentValues.get(key));
      const baselineValue = JSON.stringify(this.state.baselineValues.get(key));

      if (currentValue !== baselineValue) {
        return false;
      }
    }
    return true;
  };

  private performRefresh = async (): Promise<RefreshResult> => {
    const refreshResult = await this.props.descriptor.onRefresh();
    this.setState({ refreshResult: { ...refreshResult } });
    return refreshResult;
  };

  public onRefreshClicked = async (): Promise<void> => {
    this.setState({ isInitializing: true });
    const refreshResult = await this.performRefresh();
    if (!refreshResult.isUpdateInProgress) {
      this.initializeSmartUiComponent();
    }
    this.setState({ isInitializing: false });
  };

  public getCommonTranslation = (translationFunction: TFunction, key: string): string => {
    return translationFunction(`Common.${key}`);
  };

  private getCommandBarItems = (translate: TFunction): ICommandBarItemProps[] => {
    return [
      {
        key: "save",
        text: this.getCommonTranslation(translate, "Save"),
        iconProps: { iconName: "Save" },
        split: true,
        disabled: this.isSaveButtonDisabled(),
        onClick: this.onSaveButtonClick,
      },
      {
        key: "discard",
        text: this.getCommonTranslation(translate, "Discard"),
        iconProps: { iconName: "Undo" },
        split: true,
        disabled: this.isDiscardButtonDisabled(),
        onClick: () => {
          this.discard();
        },
      },
      {
        key: "refresh",
        text: this.getCommonTranslation(translate, "Refresh"),
        disabled: this.state.isInitializing,
        iconProps: { iconName: "Refresh" },
        split: true,
        onClick: () => {
          this.onRefreshClicked();
        },
      },
    ];
  };

  private getNotificationMessageTranslation = (translationFunction: TFunction, messageKey: string): string => {
    const translation = translationFunction(messageKey);
    if (translation === `${this.smartUiGeneratorClassName}.${messageKey}`) {
      return messageKey;
    }
    return translation;
  };

  public render(): JSX.Element {
    const containerStackTokens: IStackTokens = { childrenGap: 5 };
    if (this.state.compileErrorMessage) {
      return <MessageBar messageBarType={MessageBarType.error}>{this.state.compileErrorMessage}</MessageBar>;
    }
    return (
      <Translation>
        {(translate) => {
          const getTranslation = (key: string): string => {
            return translate(`${this.smartUiGeneratorClassName}.${key}`);
          };

          return (
            <div style={{ overflowX: "auto" }}>
              <Stack tokens={containerStackTokens} styles={{ root: { padding: 10 } }}>
                <CommandBar styles={{ root: { paddingLeft: 0 } }} items={this.getCommandBarItems(translate)} />
                {this.state.isInitializing ? (
                  <Spinner
                    size={SpinnerSize.large}
                    styles={{ root: { textAlign: "center", justifyContent: "center", width: "100%", height: "100%" } }}
                  />
                ) : (
                  <>
                    {this.state.refreshResult?.isUpdateInProgress && (
                      <MessageBar messageBarType={MessageBarType.info} styles={{ root: { width: 400 } }}>
                        {getTranslation(this.state.refreshResult.notificationMessage)}
                      </MessageBar>
                    )}
                    {this.state.notification && (
                      <MessageBar
                        messageBarType={getMessageBarType(this.state.notification.type)}
                        styles={{ root: { width: 400 } }}
                        onDismiss={() => this.setState({ notification: undefined })}
                      >
                        {this.getNotificationMessageTranslation(getTranslation, this.state.notification.message)}
                      </MessageBar>
                    )}
                    <SmartUiComponent
                      disabled={this.state.refreshResult?.isUpdateInProgress}
                      descriptor={this.state.root as SmartUiDescriptor}
                      currentValues={this.state.currentValues}
                      onInputChange={this.onInputChange}
                      onError={this.onError}
                      getTranslation={getTranslation}
                    />
                  </>
                )}
              </Stack>
            </div>
          );
        }}
      </Translation>
    );
  }
}