import { useState, useCallback, useRef } from "react";
import Joi from "joi";
import { GeneralIdRef } from "../../utils/GeneralIdRef";
import {
  CustomField,
  numberParams,
  textParams,
} from "../../modules/manager/customfields/services/customFieldsService";
import {
  CustomFieldValue,
  CustomFieldValues,
  Glossary,
} from "../../modules/manager/glossary/services/glossaryService";
import { InputType } from "./Input";

export interface FormError {
  [key: string]: string;
}

export interface FormData {
  [key: string]:
    | string
    | number
    | boolean
    | CustomFieldValue[]
    | GeneralIdRef
    | CustomField[]
    | bigint
    | Glossary
    | null
    | undefined;
}

export interface businessValidationError {
  path: string;
  message: string;
}

export interface businessValidationResult {
  details: businessValidationError[];
}

export interface joiSchema {
  [key: string]: object;
}

export interface FormState {
  loaded: boolean;
  data: FormData;
  customFields?: CustomField[];
  errors: FormError;
  redirect?: string;
}

interface UseFormReturn {
  state: FormState;
  schema: joiSchema;
  validate: (data: FormData) => FormError;
  GetCustomFieldValues: (customField: CustomField) => CustomFieldValue[];
  CustomFieldValues: () => CustomFieldValues[];
  setCustomFieldValues: (
    data: object,
    customFieldValues: CustomFieldValues[],
    customFields: CustomField[],
  ) => void;
  getCustomFieldType: (
    field: CustomFieldValues,
    childCustomFieldDefinition: CustomField[],
  ) => string;
  handleSubmit: (
    e: React.FormEvent<HTMLFormElement>,
    doSubmit: (buttonName: string) => Promise<void>,
  ) => void;
  handleGeneralError: (ex: any) => void;
  handleChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
  handleTextAreaChange: (e: React.ChangeEvent<HTMLTextAreaElement>) => void;
  handleCustomFieldChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
  handleTemplateEditorChange: (name: string, value: string) => void;
  handleSelectChange: (e: React.ChangeEvent<HTMLSelectElement>) => void;
  handlePickerChange: (name: string, value: GeneralIdRef) => void;
  handleDomainPickerChange: (name: string, values: CustomFieldValue[]) => void;
  handleGlossaryPickerChange: (
    name: string,
    values: CustomFieldValue[],
  ) => void;
  handleTemplateFormPickerChange: (name: string, value: GeneralIdRef) => void;
  handleUserPickerChange: (name: string, value: GeneralIdRef) => void;
  handleSsoProviderPickerChange: (name: string, value: GeneralIdRef) => void;
  handleToggleChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
  setState: (updates: Partial<FormState>) => void;
}

export const useForm = (initialState: FormState): UseFormReturn => {
  const [state, setStateInternal] = useState<FormState>(initialState);
  const schemaRef = useRef<joiSchema>({});

  const setState = useCallback((updates: Partial<FormState>) => {
    setStateInternal((prev) => ({ ...prev, ...updates }));
  }, []);

  const validate = useCallback(
    (data: FormData): FormError => {
      let options: Joi.ValidationOptions = {
        context: {},
        abortEarly: false,
      };

      const customFields = state.customFields;

      let validationSchema = schemaRef.current;
      if (customFields !== undefined) {
        for (const customfield of customFields) {
          const name = "customfield_" + customfield.id;
          switch (customfield.fieldType) {
            case "Number":
              if (customfield.parameters !== undefined) {
                const parameters: numberParams = JSON.parse(
                  customfield.parameters!,
                );

                options.context![name + "_minEntries"] = customfield.minEntries;
                if (parameters.minValue)
                  options.context![name + "_minValue"] = Number(
                    parameters.minValue,
                  );
                if (parameters.maxValue)
                  options.context![name + "_maxValue"] = Number(
                    parameters.maxValue,
                  );

                let minCheck = options.context![name + "_minValue"]
                  ? Joi.number()
                      .empty("")
                      .min(options.context![name + "_minValue"])
                  : Joi.number().empty("");
                let maxCheck = options.context![name + "_maxValue"]
                  ? Joi.number()
                      .empty("")
                      .max(options.context![name + "_maxValue"])
                  : Joi.number().empty("");

                validationSchema[name] = Joi.array()
                  .min(1)
                  .items(
                    Joi.object({
                      displayValue: Joi.string().allow(""),
                      value: Joi.when("$" + name + "_minEntries", {
                        is: 0,
                        then: Joi.number().empty(""),
                        otherwise: Joi.number().required(),
                      })
                        .when("$" + name + "_minValue", {
                          is: Joi.number(),
                          then: minCheck,
                        })
                        .when("$" + name + "_maxValue", {
                          is: Joi.number(),
                          then: maxCheck,
                        })
                        .label(customfield.name),
                    }),
                  );
              } else {
                validationSchema[name] = Joi.optional().label(customfield.name);
              }
              break;
            default:
              validationSchema[name] = Joi.optional().label(customfield.name);
          }
        }
      }

      const joiSchema = Joi.object(validationSchema);
      const { error } = joiSchema.validate(data, options);
      let errors: FormError = {};
      if (error) {
        if (error.details === undefined) {
          errors[error.name] = error.message;
        } else {
          for (let item of error.details) {
            errors[item.path[0]] = item.message;
          }
        }
      }

      return errors;
    },
    [state.customFields],
  );

  const GetCustomFieldValues = useCallback(
    (customField: CustomField): CustomFieldValue[] => {
      const name = "customfield_" + customField.id;
      const codedValue = state.data[name];

      let values: CustomFieldValue[] = [];

      switch (customField.fieldType) {
        case "FormTemplate":
          if (codedValue !== undefined) {
            const formTemplateValue = {
              value: JSON.stringify(codedValue as GeneralIdRef),
            };
            values.push(formTemplateValue);
          }
          break;
        case "Sequence":
          if (codedValue !== undefined) {
            values = codedValue as CustomFieldValue[];
          }
          break;
        case "Glossary":
          if (codedValue !== undefined) {
            values = codedValue as CustomFieldValue[];
          }
          break;
        case "Domain":
          if (codedValue !== undefined) {
            values = codedValue as CustomFieldValue[];
          }
          break;
        case "Text":
          const textParameters: textParams = JSON.parse(
            customField.parameters!,
          );
          if (textParameters.multiLine) {
            const textValue = {
              value:
                codedValue === undefined
                  ? customField.defaultValue
                  : codedValue,
              displayValue:
                codedValue === undefined
                  ? customField.defaultValue
                  : codedValue,
            } as CustomFieldValue;
            values.push(textValue);
          } else {
            if (codedValue === undefined) {
              const numberValue = {
                value: customField.defaultValue,
                displayValue: customField.defaultValue,
              } as CustomFieldValue;
              values.push(numberValue);
            } else {
              values = codedValue as CustomFieldValue[];
            }
          }
          break;
        case "Number":
          if (codedValue === undefined) {
            const numberValue = {
              value: customField.defaultValue,
              displayValue: customField.defaultValue,
            } as CustomFieldValue;
            values.push(numberValue);
          } else {
            values = codedValue as CustomFieldValue[];
          }
          break;
        default:
          const textValue = {
            value:
              codedValue === undefined
                ? customField.defaultValue
                : String((codedValue as CustomFieldValue[])[0].displayValue),
          };
          values.push(textValue);
          break;
      }

      return values;
    },
    [state.data],
  );

  const CustomFieldValues = useCallback((): CustomFieldValues[] => {
    const customFields = state.customFields;
    let result: CustomFieldValues[] = [];

    if (customFields === undefined) {
      return result;
    }

    for (const customfield of customFields) {
      const values = GetCustomFieldValues(customfield);

      const id: GeneralIdRef = {
        id: customfield.id,
        guid: customfield.guid,
      };

      const newItem: CustomFieldValues = {
        id,
        values,
      };

      result.push(newItem);
    }

    return result;
  }, [state.customFields, GetCustomFieldValues]);

  const getCustomFieldType = useCallback(
    (
      field: CustomFieldValues,
      childCustomFieldDefinition: CustomField[],
    ): string => {
      const fieldDefinition = childCustomFieldDefinition.filter(
        (x) => x.id === field.id.id,
      )[0];

      if (fieldDefinition.parameters) {
        const textParameters: textParams = JSON.parse(
          fieldDefinition.parameters!,
        );
        if (textParameters.multiLine) return "multilinetext";
      }

      return fieldDefinition.fieldType;
    },
    [],
  );

  const setCustomFieldValues = useCallback(
    (
      data: object,
      customFieldValues: CustomFieldValues[],
      customFields: CustomField[],
    ) => {
      if (customFieldValues !== undefined) {
        for (const x of customFieldValues) {
          const customfieldName = "customfield_" + x.id.id;

          switch (getCustomFieldType(x, customFields).toLowerCase()) {
            case "glossary":
            case "domain":
            case "number":
            case "text":
              (data as any)[customfieldName] = x.values.map((x) => {
                return {
                  displayValue: x.displayValue,
                  value: x.value,
                };
              });
              break;
            case "formtemplate":
            case "multilinetext":
              (data as any)[customfieldName] = x.values[0].value;
              break;
            default:
              (data as any)[customfieldName] = x.values;
              break;
          }
        }
      }
    },
    [getCustomFieldType],
  );

  const handleSubmit = useCallback(
    (
      e: React.FormEvent<HTMLFormElement>,
      doSubmit: (buttonName: string) => Promise<void>,
    ) => {
      e.preventDefault();

      const submitEvent = e.nativeEvent as SubmitEvent;
      const submitter = submitEvent.submitter as any;

      const errors = validate(state.data);
      setState({ errors });

      const disabled = Object.keys(errors).length > 0;

      if (disabled) return;

      void doSubmit(submitter.name);
    },
    [state.data, validate, setState],
  );

  const handleGeneralError = useCallback(
    (ex: any) => {
      const errors: FormError = { ...state.errors };

      if (ex.response) {
        errors._general = ex.response.data.detail;
      } else {
        errors._general = ex.message;
      }

      setState({ errors });
    },
    [state.errors, setState],
  );

  const handleChange = useCallback(
    (e: React.ChangeEvent<HTMLInputElement>) => {
      const input = e.currentTarget;
      const data: FormData = { ...state.data };

      if ((input as any).type === InputType.checkbox) {
        data[input.name] = !data[input.name];
      } else data[input.name] = input.value;

      const errors = validate(data);
      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleTextAreaChange = useCallback(
    (e: React.ChangeEvent<HTMLTextAreaElement>) => {
      const input = e.currentTarget;
      const data: FormData = { ...state.data };

      data[input.name] = input.value;

      const errors = validate(data);
      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleCustomFieldChange = useCallback(
    (e: React.ChangeEvent<HTMLInputElement>) => {
      const input = e.currentTarget;
      const data: FormData = { ...state.data };

      switch ((input as any).type) {
        case InputType.checkbox:
          data[input.name] = !data[input.name];
          break;
        default:
          const customFieldValue: CustomFieldValue = {
            displayValue: input.value,
            value: input.value,
          };

          data[input.name] = [customFieldValue];
          break;
      }

      const errors = validate(data);
      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleTemplateEditorChange = useCallback(
    (name: string, value: string) => {
      const data: FormData = { ...state.data };

      data[name] = value;

      const errors = validate(data);
      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleSelectChange = useCallback(
    (e: React.ChangeEvent<HTMLSelectElement>) => {
      const input = e.currentTarget;

      const data: FormData = { ...state.data };
      data[input.name] = input.value;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handlePickerChange = useCallback(
    (name: string, value: GeneralIdRef) => {
      const data: FormData = { ...state.data };
      data[name] = value;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleDomainPickerChange = useCallback(
    (name: string, values: CustomFieldValue[]) => {
      const data: FormData = { ...state.data };
      data[name] = values;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleGlossaryPickerChange = useCallback(
    (name: string, values: CustomFieldValue[]) => {
      const data: FormData = { ...state.data };
      data[name] = values;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleTemplateFormPickerChange = useCallback(
    (name: string, value: GeneralIdRef) => {
      const data: FormData = { ...state.data };
      data[name] = value;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleUserPickerChange = useCallback(
    (name: string, value: GeneralIdRef) => {
      const data: FormData = { ...state.data };
      data[name] = value;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleSsoProviderPickerChange = useCallback(
    (name: string, value: GeneralIdRef) => {
      const data: FormData = { ...state.data };
      data[name] = value;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const handleToggleChange = useCallback(
    (e: React.ChangeEvent<HTMLInputElement>) => {
      const input = e.currentTarget;
      const { name, checked } = input;

      const data: FormData = { ...state.data };
      data[name] = checked;
      const errors = validate(data);

      setState({ data, errors });
    },
    [state.data, validate, setState],
  );

  const api: any = {
    state,
    schema: schemaRef.current,
    validate,
    GetCustomFieldValues,
    CustomFieldValues,
    setCustomFieldValues,
    getCustomFieldType,
    handleSubmit,
    handleGeneralError,
    handleChange,
    handleTextAreaChange,
    handleCustomFieldChange,
    handleTemplateEditorChange,
    handleSelectChange,
    handlePickerChange,
    handleDomainPickerChange,
    handleGlossaryPickerChange,
    handleTemplateFormPickerChange,
    handleUserPickerChange,
    handleSsoProviderPickerChange,
    handleToggleChange,
    setState,
  };
  Object.defineProperty(api, "schema", {
    get: () => schemaRef.current,
    set: (value: joiSchema) => {
      schemaRef.current = value || {};
    },
  });

  return api as UseFormReturn;
};