1 files changed, 87 insertions, 0 deletions

diff --git a/client/src/app/shared/shared-forms/form-validators/form-validator.service.ts b/client/src/app/shared/shared-forms/form-validators/form-validator.service.ts
new file mode 100644
index 000000000..dec7d8d9a
--- /dev/null
+++ b/client/src/app/shared/shared-forms/form-validators/form-validator.service.ts
@@ -0,0 +1,87 @@
+import { FormBuilder, FormControl, FormGroup, ValidatorFn } from '@angular/forms'
+import { Injectable } from '@angular/core'
+import { FormReactiveErrors, FormReactiveValidationMessages } from '../form-reactive'
+
+export type BuildFormValidator = {
+  VALIDATORS: ValidatorFn[],
+  MESSAGES: { [ name: string ]: string }
+}
+export type BuildFormArgument = {
+  [ id: string ]: BuildFormValidator | BuildFormArgument
+}
+export type BuildFormDefaultValues = {
+  [ name: string ]: string | string[] | BuildFormDefaultValues
+}
+
+@Injectable()
+export class FormValidatorService {
+
+  constructor (
+    private formBuilder: FormBuilder
+  ) {}
+
+  buildForm (obj: BuildFormArgument, defaultValues: BuildFormDefaultValues = {}) {
+    const formErrors: FormReactiveErrors = {}
+    const validationMessages: FormReactiveValidationMessages = {}
+    const group: { [key: string]: any } = {}
+
+    for (const name of Object.keys(obj)) {
+      formErrors[name] = ''
+
+      const field = obj[name]
+      if (this.isRecursiveField(field)) {
+        const result = this.buildForm(field as BuildFormArgument, defaultValues[name] as BuildFormDefaultValues)
+        group[name] = result.form
+        formErrors[name] = result.formErrors
+        validationMessages[name] = result.validationMessages
+
+        continue
+      }
+
+      if (field && field.MESSAGES) validationMessages[name] = field.MESSAGES as { [ name: string ]: string }
+
+      const defaultValue = defaultValues[name] || ''
+
+      if (field && field.VALIDATORS) group[name] = [ defaultValue, field.VALIDATORS ]
+      else group[name] = [ defaultValue ]
+    }
+
+    const form = this.formBuilder.group(group)
+    return { form, formErrors, validationMessages }
+  }
+
+  updateForm (
+    form: FormGroup,
+    formErrors: FormReactiveErrors,
+    validationMessages: FormReactiveValidationMessages,
+    obj: BuildFormArgument,
+    defaultValues: BuildFormDefaultValues = {}
+  ) {
+    for (const name of Object.keys(obj)) {
+      formErrors[name] = ''
+
+      const field = obj[name]
+      if (this.isRecursiveField(field)) {
+        this.updateForm(
+          form[name],
+          formErrors[name] as FormReactiveErrors,
+          validationMessages[name] as FormReactiveValidationMessages,
+          obj[name] as BuildFormArgument,
+          defaultValues[name] as BuildFormDefaultValues
+        )
+        continue
+      }
+
+      if (field && field.MESSAGES) validationMessages[name] = field.MESSAGES as { [ name: string ]: string }
+
+      const defaultValue = defaultValues[name] || ''
+
+      if (field && field.VALIDATORS) form.addControl(name, new FormControl(defaultValue, field.VALIDATORS as ValidatorFn[]))
+      else form.addControl(name, new FormControl(defaultValue))
+    }
+  }
+
+  private isRecursiveField (field: any) {
+    return field && typeof field === 'object' && !field.MESSAGES && !field.VALIDATORS
+  }
+}