import type { Field } from '@prisma/client';
import { FieldType } from '@prisma/client';
import { DateTime } from 'luxon';
import { P, match } from 'ts-pattern';
import { z } from 'zod';

import { validateCheckboxLength } from '@documenso/lib/advanced-fields-validation/validate-checkbox';
import { validateDropdownField } from '@documenso/lib/advanced-fields-validation/validate-dropdown';
import { validateNumberField } from '@documenso/lib/advanced-fields-validation/validate-number';
import { validateTextField } from '@documenso/lib/advanced-fields-validation/validate-text';
import { DEFAULT_DOCUMENT_DATE_FORMAT } from '@documenso/lib/constants/date-formats';
import { isBase64Image } from '@documenso/lib/constants/signatures';
import { DEFAULT_DOCUMENT_TIME_ZONE } from '@documenso/lib/constants/time-zones';
import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
import type { TDocumentMeta } from '@documenso/lib/types/document-meta';
import {
  ZCheckboxFieldMeta,
  ZDropdownFieldMeta,
  ZNumberFieldMeta,
  ZRadioFieldMeta,
  ZTextFieldMeta,
} from '@documenso/lib/types/field-meta';
import { toCheckboxCustomText, toRadioCustomText } from '@documenso/lib/utils/fields';
import type { TSignEnvelopeFieldValue } from '@documenso/trpc/server/envelope-router/sign-envelope-field.types';
import { checkboxValidationSigns } from '@documenso/ui/primitives/document-flow/field-items-advanced-settings/constants';

export type ExtractFieldInsertionValuesOptions = {
  fieldValue: TSignEnvelopeFieldValue;
  field: Field;
  documentMeta: Pick<TDocumentMeta, 'timezone' | 'dateFormat' | 'typedSignatureEnabled'>;
};

export const extractFieldInsertionValues = ({
  fieldValue,
  field,
  documentMeta,
}: ExtractFieldInsertionValuesOptions): { customText: string; inserted: boolean } => {
  return match(fieldValue)
    .with({ type: FieldType.EMAIL }, (fieldValue) => {
      const parsedEmailValue = z.string().email().nullable().safeParse(fieldValue.value);

      if (!parsedEmailValue.success) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Invalid email',
        });
      }

      if (parsedEmailValue.data === null) {
        return {
          customText: '',
          inserted: false,
        };
      }

      return {
        customText: parsedEmailValue.data,
        inserted: true,
      };
    })
    .with({ type: P.union(FieldType.NAME, FieldType.INITIALS) }, (fieldValue) => {
      const parsedGenericStringValue = z.string().min(1).nullable().safeParse(fieldValue.value);

      if (!parsedGenericStringValue.success) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Value is required',
        });
      }

      if (parsedGenericStringValue.data === null) {
        return {
          customText: '',
          inserted: false,
        };
      }

      return {
        customText: parsedGenericStringValue.data,
        inserted: true,
      };
    })
    .with({ type: FieldType.DATE }, (fieldValue) => {
      if (!fieldValue.value) {
        return {
          customText: '',
          inserted: false,
        };
      }

      return {
        customText: DateTime.now()
          .setZone(documentMeta.timezone ?? DEFAULT_DOCUMENT_TIME_ZONE)
          .toFormat(documentMeta.dateFormat ?? DEFAULT_DOCUMENT_DATE_FORMAT),
        inserted: true,
      };
    })
    .with({ type: FieldType.NUMBER }, (fieldValue) => {
      if (!fieldValue.value) {
        return {
          customText: '',
          inserted: false,
        };
      }

      const numberFieldParsedMeta = ZNumberFieldMeta.parse(field.fieldMeta);
      const errors = validateNumberField(fieldValue.value.toString(), numberFieldParsedMeta, true);

      // Todo
      if (errors.length > 0) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Invalid number',
        });
      }

      return {
        customText: fieldValue.value.toString(),
        inserted: true,
      };
    })
    .with({ type: FieldType.TEXT }, (fieldValue) => {
      if (fieldValue.value === null) {
        return {
          customText: '',
          inserted: false,
        };
      }

      const parsedTextFieldMeta = ZTextFieldMeta.parse(field.fieldMeta);
      const errors = validateTextField(fieldValue.value, parsedTextFieldMeta, true);

      // Todo
      if (errors.length > 0) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Invalid email',
        });
      }

      return {
        customText: fieldValue.value,
        inserted: true,
      };
    })
    .with({ type: FieldType.RADIO }, (fieldValue) => {
      if (fieldValue.value === null) {
        return {
          customText: '',
          inserted: false,
        };
      }

      const parsedRadioFieldParsedMeta = ZRadioFieldMeta.parse(field.fieldMeta);
      const radioFieldValues = parsedRadioFieldParsedMeta.values || [];

      if (!radioFieldValues[fieldValue.value]) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Invalid radio value',
        });
      }

      return {
        customText: toRadioCustomText(fieldValue.value),
        inserted: true,
      };
    })
    .with({ type: FieldType.CHECKBOX }, (fieldValue) => {
      if (fieldValue.value === null || fieldValue.value.length === 0) {
        return {
          customText: '',
          inserted: false,
        };
      }

      const parsedCheckboxFieldParsedMeta = ZCheckboxFieldMeta.parse(field.fieldMeta);
      const checkboxFieldValues = parsedCheckboxFieldParsedMeta.values || [];

      const { value } = fieldValue;

      const selectedValues = value.map((valueIndex) => checkboxFieldValues[valueIndex]);

      if (selectedValues.some((value) => !value)) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Invalid checkbox values',
        });
      }

      const { validationRule, validationLength } = parsedCheckboxFieldParsedMeta;

      if (validationRule && validationLength) {
        const checkboxValidationRule = checkboxValidationSigns.find(
          (sign) => sign.label === validationRule,
        );

        // Todo: Envelopes - Test this.
        if (checkboxValidationRule) {
          const isValid = validateCheckboxLength(
            selectedValues.length,
            checkboxValidationRule.value,
            validationLength,
          );

          if (!isValid) {
            throw new AppError(AppErrorCode.INVALID_BODY, {
              message: 'Checkbox values failed length validation',
            });
          }
        } else {
          // Should throw an error, but we don't want to throw configuration errors during signing.
          // Todo: Logging.
        }
      }

      return {
        customText: toCheckboxCustomText(fieldValue.value),
        inserted: true,
      };
    })
    .with({ type: FieldType.DROPDOWN }, (fieldValue) => {
      if (fieldValue.value === null) {
        return {
          customText: '',
          inserted: false,
        };
      }

      const parsedDropdownFieldMeta = ZDropdownFieldMeta.parse(field.fieldMeta);
      const errors = validateDropdownField(fieldValue.value, parsedDropdownFieldMeta, true);

      // Todo: Envelopes
      if (errors.length > 0) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Invalid dropdown value',
        });
      }

      return {
        customText: fieldValue.value,
        inserted: true,
      };
    })
    .with({ type: FieldType.SIGNATURE }, (fieldValue) => {
      const { value } = fieldValue;

      if (!value) {
        return {
          customText: '',
          inserted: false,
        };
      }

      const isBase64 = isBase64Image(value);

      if (documentMeta.typedSignatureEnabled === false && !isBase64) {
        throw new AppError(AppErrorCode.INVALID_BODY, {
          message: 'Typed signatures are not allowed. Please draw your signature',
        });
      }

      return {
        customText: '',
        inserted: true,
      };
    })
    .exhaustive();
};