CRUD operation screen in the demo app.

demo/src/main/java/com/google/android/fhir/demo/CrudOperationFragment.kt

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.fhir.demo
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.MenuItem
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import android.widget.CheckBox
+import android.widget.EditText
+import android.widget.RadioGroup
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import androidx.navigation.fragment.NavHostFragment
+import com.google.android.fhir.demo.helpers.PatientCreationHelper
+import com.google.android.material.tabs.TabLayout
+import kotlinx.coroutines.launch
+import org.hl7.fhir.r4.model.Enumerations
+
+class CrudOperationFragment : Fragment() {
+  private val crudOperationViewModel: CrudOperationViewModel by viewModels()
+
+  override fun onCreateView(
+    inflater: LayoutInflater,
+    container: ViewGroup?,
+    savedInstanceState: Bundle?,
+  ): View {
+    return inflater.inflate(R.layout.fragment_crud_layout, container, false)
+  }
+
+  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+    super.onViewCreated(view, savedInstanceState)
+    setUpActionBar()
+    setHasOptionsMenu(true)
+    setupUiOnScreenLaunch()
+    viewLifecycleOwner.lifecycleScope.launch {
+      viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+        crudOperationViewModel.patientUiState.collect { patientUiState ->
+          patientUiState?.let {
+            when (it.operationType) {
+              OperationType.CREATE -> {
+                Toast.makeText(requireContext(), "Patient is saved", Toast.LENGTH_SHORT).show()
+              }
+              OperationType.READ -> displayPatientDetails(it)
+              OperationType.UPDATE -> {
+                Toast.makeText(requireContext(), "Patient is updated", Toast.LENGTH_SHORT).show()
+              }
+              OperationType.DELETE -> {
+                // Reset the page as the patient has been deleted.
+                clearUiFieldValues()
+                configureFieldsForOperation(OperationType.DELETE)
+                Toast.makeText(requireContext(), "Patient is deleted", Toast.LENGTH_SHORT).show()
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  override fun onOptionsItemSelected(item: MenuItem): Boolean {
+    return when (item.itemId) {
+      android.R.id.home -> {
+        NavHostFragment.findNavController(this).navigateUp()
+        true
+      }
+      else -> false
+    }
+  }
+
+  private fun setUpActionBar() {
+    (requireActivity() as AppCompatActivity).supportActionBar?.apply {
+      title = requireContext().getString(R.string.crud_operations)
+      setDisplayHomeAsUpEnabled(true)
+    }
+  }
+
+  private fun setupUiOnScreenLaunch() {
+    setupTabLayoutChangeListener()
+    selectTab(TAB_CREATE)
+    setupUiForCrudOperation(OperationType.CREATE)
+    requireView().findViewById<Button>(R.id.btnSubmit).setOnClickListener {
+      val currentOperationType =
+        getOperationTypeByTabPosition(
+          requireView().findViewById<TabLayout>(R.id.tabLayoutCrud).selectedTabPosition,
+        )
+      when (currentOperationType) {
+        OperationType.CREATE -> createPatient()
+        OperationType.READ -> {
+          isPatientCreationRequired()
+          crudOperationViewModel.readPatientById()
+        }
+        OperationType.UPDATE -> updatePatient()
+        OperationType.DELETE -> deletePatient()
+      }
+    }
+  }
+
+  private fun setupUiForCrudOperation(operationType: OperationType) {
+    when (operationType) {
+      OperationType.CREATE -> {
+        clearUiFieldValues()
+        setPatientIdUiFieldText(PatientCreationHelper.createPatientId())
+        updateSubmitButtonText(getString(R.string.create))
+      }
+      OperationType.READ -> {
+        clearUiFieldValues()
+        setPatientIdUiFieldText(crudOperationViewModel.currentPatientLogicalId)
+        updateSubmitButtonText(getString(R.string.read))
+      }
+      OperationType.UPDATE -> {
+        updateSubmitButtonText(getString(R.string.update))
+        crudOperationViewModel.readPatientById()
+      }
+      OperationType.DELETE -> {
+        updateSubmitButtonText(getString(R.string.delete))
+        crudOperationViewModel.readPatientById()
+      }
+    }
+    configureFieldsForOperation(operationType)
+  }
+
+  private fun updateSubmitButtonText(text: String) {
+    requireView().findViewById<Button>(R.id.btnSubmit).text = text
+  }
+
+  private fun setPatientIdUiFieldText(patientId: String?) {
+    requireView().findViewById<EditText>(R.id.etId).setText(patientId)
+  }
+
+  private fun selectTab(position: Int) {
+    val tabLayout = requireView().findViewById<TabLayout>(R.id.tabLayoutCrud)
+    val tab = tabLayout.getTabAt(position)
+    tab?.select()
+  }
+
+  private fun setupTabLayoutChangeListener() {
+    val tabLayout = requireView().findViewById<TabLayout>(R.id.tabLayoutCrud)
+    tabLayout.addOnTabSelectedListener(
+      object : TabLayout.OnTabSelectedListener {
+        override fun onTabSelected(tab: TabLayout.Tab?) {
+          val currentOperationType = getOperationTypeByTabPosition(tab?.position ?: TAB_CREATE)
+          setupUiForCrudOperation(currentOperationType)
+        }
+
+        override fun onTabUnselected(tab: TabLayout.Tab?) {}
+
+        override fun onTabReselected(tab: TabLayout.Tab?) {}
+      },
+    )
+  }
+
+  private fun clearUiFieldValues() {
+    val editTexts =
+      listOf(
+        R.id.etId,
+        R.id.etFirstName,
+        R.id.etLastName,
+        R.id.etBirthDate,
+      )
+    editTexts.forEach { editTextId ->
+      requireView().findViewById<EditText>(editTextId).apply {
+        text.clear()
+        clearFocus()
+      }
+    }
+    requireView().findViewById<RadioGroup>(R.id.radioGroupGender).clearCheck()
+    requireView().findViewById<CheckBox>(R.id.checkBoxActive).isChecked = false
+  }
+
+  private fun configureFieldsForOperation(operationType: OperationType) {
+    val isEditable =
+      when (operationType) {
+        OperationType.CREATE,
+        OperationType.UPDATE, -> true
+        else -> false
+      }
+    val views =
+      listOf(
+        R.id.etFirstName,
+        R.id.etLastName,
+        R.id.etBirthDate,
+        R.id.radioGroupGender,
+        R.id.rbMale,
+        R.id.rbFemale,
+        R.id.rbOther,
+        R.id.checkBoxActive,
+      )
+    views.forEach { viewId -> requireView().findViewById<View>(viewId).isEnabled = isEditable }
+  }
+
+  private fun displayPatientDetails(patientUiState: PatientUiState) {
+    setPatientIdUiFieldText(patientUiState.patientId)
+    requireView().findViewById<EditText>(R.id.etFirstName).apply {
+      setText(patientUiState.firstName)
+    }
+    requireView().findViewById<EditText>(R.id.etLastName).apply {
+      setText(patientUiState.lastName ?: "")
+    }
+    requireView().findViewById<EditText>(R.id.etBirthDate).apply {
+      setText(patientUiState.birthDate ?: "")
+    }
+
+    val radioGroupGender = requireView().findViewById<RadioGroup>(R.id.radioGroupGender)
+    radioGroupGender.clearCheck()
+    val genderRadioButtonId =
+      when (patientUiState.gender) {
+        Enumerations.AdministrativeGender.MALE -> R.id.rbMale
+        Enumerations.AdministrativeGender.FEMALE -> R.id.rbFemale
+        Enumerations.AdministrativeGender.OTHER -> R.id.rbOther
+        else -> null
+      }
+    genderRadioButtonId?.let { radioGroupGender.check(it) }
+
+    requireView().findViewById<CheckBox>(R.id.checkBoxActive).apply {
+      isChecked = patientUiState.isActive
+    }
+  }
+
+  private fun isPatientCreationRequired(): Boolean {
+    if (crudOperationViewModel.currentPatientLogicalId.isNullOrEmpty()) {
+      Toast.makeText(requireContext(), "Please create a patient first.", Toast.LENGTH_SHORT).show()
+      return true
+    }
+    return false
+  }
+
+  private fun getOperationTypeByTabPosition(tabPosition: Int): OperationType {
+    return when (tabPosition) {
+      TAB_CREATE -> {
+        OperationType.CREATE
+      }
+      TAB_READ -> {
+        OperationType.READ
+      }
+      TAB_UPDATE -> {
+        OperationType.UPDATE
+      }
+      TAB_DELETE -> {
+        OperationType.DELETE
+      }
+      else -> {
+        error("Invalid tab selection.")
+      }
+    }
+  }
+
+  private fun createPatient() {
+    val patientId = requireView().findViewById<EditText>(R.id.etId).text.toString()
+    val firstName = requireView().findViewById<EditText>(R.id.etFirstName).text.toString().trim()
+    if (firstName.isBlank()) {
+      Toast.makeText(requireContext(), "First name is required.", Toast.LENGTH_SHORT).show()
+      return
+    }
+    val lastName = requireView().findViewById<EditText>(R.id.etLastName).text.toString().trim()
+    val birthDate = requireView().findViewById<EditText>(R.id.etBirthDate).text.toString().trim()
+    if (crudOperationViewModel.isBirthDateValid(birthDate)) {
+      Toast.makeText(requireContext(), "Please enter a valid birth date.", Toast.LENGTH_SHORT)
+        .show()
+      return
+    }
+    val selectedGenderId =
+      requireView().findViewById<RadioGroup>(R.id.radioGroupGender).checkedRadioButtonId
+    val gender =
+      when (selectedGenderId) {
+        R.id.rbMale -> Enumerations.AdministrativeGender.MALE
+        R.id.rbFemale -> Enumerations.AdministrativeGender.FEMALE
+        R.id.rbOther -> Enumerations.AdministrativeGender.OTHER
+        else -> null
+      }
+    val isActive = requireView().findViewById<CheckBox>(R.id.checkBoxActive).isChecked
+    crudOperationViewModel.createPatient(
+      patientId = patientId,
+      firstName = firstName,
+      lastName = lastName,
+      birthDate = birthDate,
+      gender = gender,
+      isActive = isActive,
+    )
+  }
+
+  private fun updatePatient() {
+    if (isPatientCreationRequired()) {
+      return
+    }
+    val firstName = requireView().findViewById<EditText>(R.id.etFirstName).text.toString().trim()
+    val lastName = requireView().findViewById<EditText>(R.id.etLastName).text.toString().trim()
+    val birthDate = requireView().findViewById<EditText>(R.id.etBirthDate).text.toString().trim()
+    if (crudOperationViewModel.isBirthDateValid(birthDate)) {
+      Toast.makeText(requireContext(), "Please enter a valid birth date.", Toast.LENGTH_SHORT)
+        .show()
+      return
+    }
+    val selectedGenderId =
+      requireView().findViewById<RadioGroup>(R.id.radioGroupGender).checkedRadioButtonId
+    val gender =
+      when (selectedGenderId) {
+        R.id.rbMale -> Enumerations.AdministrativeGender.MALE
+        R.id.rbFemale -> Enumerations.AdministrativeGender.FEMALE
+        R.id.rbOther -> Enumerations.AdministrativeGender.OTHER
+        else -> null
+      }
+    val isActive = requireView().findViewById<CheckBox>(R.id.checkBoxActive).isChecked
+    if (firstName.isBlank()) {
+      Toast.makeText(requireContext(), "First name is required.", Toast.LENGTH_SHORT).show()
+      return
+    }
+    crudOperationViewModel.updatePatient(
+      firstName = firstName,
+      lastName = lastName,
+      birthDate = birthDate,
+      gender = gender,
+      isActive = isActive,
+    )
+  }
+
+  private fun deletePatient() {
+    if (isPatientCreationRequired()) {
+      return
+    }
+    crudOperationViewModel.currentPatientLogicalId?.let { crudOperationViewModel.deletePatient() }
+  }
+
+  companion object {
+    private const val TAB_CREATE = 0
+    private const val TAB_READ = 1
+    private const val TAB_UPDATE = 2
+    private const val TAB_DELETE = 3
+  }
+}