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report.Rmd

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+---
+title: "BioAge Report"
+output: html_document
+params:
+  name: "User"
+  age: 30
+  bioage: 30
+  gender: "Male"
+  smoking_status: "No"
+  bmi: 25
+  waist_circumference: 80
+  date: "`r Sys.Date()`"
+---
+
+# BioAge Report for `r params$name`
+
+## Personal Information
+
+- **Name**: `r params$name`
+- **Gender**: `r params$gender`
+- **Chronological Age**: `r params$age` years
+- **Smoking Status**: `r params$smoking_status`
+- **BMI**: `r params$bmi`
+- **Waist Circumference**: `r params$waist_circumference` cm
+
+## BioAge Calculation
+
+Your biological age is calculated based on several factors. 
+Below are the results:
+
+- **Chronological Age**: `r params$age` years
+- **Calculated BioAge**: `r params$bioage` years
+
+### Interpretation
+
+```{r}
+if (params$bioage <= params$age) {
+  result_message <- paste0("Congratulations, ", params$name, "! Your biological age is ", round(params$bioage, 2), 
+                           " years old, which is equal to or less than your chronological age. This indicates a healthy lifestyle.")
+} else {
+  result_message <- paste0("Hi, ", params$name, ", your biological age is ", round(params$bioage, 2), 
+                           " years old, which is higher than your chronological age. Consider adopting healthier lifestyle habits to improve your biological age.")
+}
+result_message

server.R

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+#Server.R
+library(shiny)
+library(rmarkdown)
+library(knitr)
+library(tinytex)
+
+# Function: Biological Age Calculation
+calculate_bioage <- function(age, gender, smoking_status, bmi, waist_circumference) {
+  bioage <- age + (bmi * 0.1) + (ifelse(smoking_status == "Yes", 5, 0))
+  return(bioage)
+}
+
+# Function: Validate User Inputs
+validate_inputs <- function(input) {
+  validate(
+    need(input$age > 0, "Age must be positive"),
+    need(input$bmi > 0, "BMI must be positive"),
+    need(input$waist_circumference > 0, "Waist circumference must be positive")
+  )
+}
+
+# Function: Show Modal Dialog starting 
+show_bioage_modal <- function(name, age, bioage) {
+  # Determine the message based on BioAge vs Chronological Age.
+  message <- if (bioage < age) {
+    paste0(
+      name, ", your BioAge is ", round(bioage, 2), 
+      " years, which is lower than your Chronological Age. Great job maintaining healthy habits!"
+    )
+  } else if (bioage > age) {
+    paste0(
+      name, ", your BioAge is ", round(bioage, 2), 
+      " years, which is higher than your Chronological Age. Consider focusing on healthier lifestyle choices."
+    )
+  } else {
+    paste0(
+      name, ", your BioAge matches your Chronological Age, indicating balanced health markers."
+    )
+  }
+  
+  # Modal dialogue starting
+  showModal(
+    modalDialog(
+      title = tagList(h3(paste0(name, "'s BioAge"))),
+      div(
+        style = "text-align: center; margin-top: 20px;",
+        fluidRow(
+          column(5, div(
+            p("Chronological Age", style = "font-weight: bold; font-size: 16px;"),
+            p(paste(age, "years"), style = "font-size: 24px; font-weight: bold; color: #4CAF50;")
+          )),
+          column(2, div(
+            p("→", style = "font-size: 32px; font-weight: bold; color: #888; margin-top: 25px;")
+          )),
+          column(5, div(
+            p("BioAge", style = "font-weight: bold; font-size: 16px;"),
+            p(paste(round(bioage, 2), "years"), style = "font-size: 24px; font-weight: bold; color: #2196F3;")
+          ))
+        )
+      ),
+      div(
+        style = "text-align: center; margin-top: 20px;",
+        p(message, style = "font-size: 16px; font-weight: bold;")
+      ),
+      div(
+        style = "text-align: center; margin-top: 10px;",
+        p("Complete report sent to your WhatsApp", style = "font-size: 14px;"),
+        p("xxxxxxxx4321", style = "font-size: 14px; color: #888;")
+      ),
+      easyClose = TRUE
+    )
+  )
+}
+
+
+# Pdf report generation block
+generate_report <- function(params, output_file) {
+  src <- normalizePath('report.Rmd')  # Ensure 'report.Rmd' exists in your project directory
+  
+  # Copy Rmd file to a temporary directory ( using tinytex not LaTex) which is lite weight.
+  owd <- setwd(tempdir())
+  on.exit(setwd(owd))
+  
+  file.copy(src, 'report.Rmd', overwrite = TRUE)
+  
+  # Render the report with the provided parameters in the form entries
+  rmarkdown::render(
+    input = 'report.Rmd',
+    output_file = output_file,
+    output_format = 'pdf_document',
+    envir = new.env(parent = globalenv())  # Use a new environment to avoid conflicts
+  )
+}
+
+# Server Logic
+server <- function(input, output, session) {
+  observeEvent(input$calculate, {
+    validate_inputs(input)
+    
+    bioage <- calculate_bioage(
+      age = input$age,
+      gender = input$gender,
+      smoking_status = ifelse(input$smoker, "Yes", "No"),
+      bmi = input$bmi,
+      waist_circumference = input$waist_circumference
+    )
+    
+    # Pass required arguments explicitly
+    show_bioage_modal(
+      name = input$name,
+      age = input$age,
+      bioage = bioage
+    )
+  })
+  
+  output$downloadReport <- downloadHandler(
+    filename = function() {
+      paste("bioage_report_", Sys.Date(), ".pdf", sep = "")
+    },
+    content = function(file) {
+      tryCatch({
+        generate_report(
+          params = list(
+            name = input$name,
+            age = input$age,
+            bioage = calculate_bioage(
+              age = input$age,
+              gender = input$gender,
+              smoking_status = ifelse(input$smoker, "Yes", "No"),
+              bmi = input$bmi,
+              waist_circumference = input$waist_circumference
+            )
+          ),
+          output_file = file
+        )
+      }, error = function(e) {
+        showModal(modalDialog(
+          title = "Error",
+          paste("Failed to generate the report:", e$message),
+          easyClose = TRUE
+        ))
+      })
+    }
+  )
+}

ui.R

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+#ui.R
+library(shiny)
+
+ui <- fluidPage(
+  titlePanel("BioAge Calculator"),
+  sidebarLayout(
+    sidebarPanel(
+      h4("Enter Your Details"),
+      textInput("name", "Name", placeholder = "Enter your full name"),
+      numericInput("age", "Chronological Age (years)", value = 30, min = 0, step = 1),
+      radioButtons("gender", "Gender", choices = c("Male", "Female"), inline = TRUE),
+      checkboxInput("smoker", "Smoker", value = FALSE),
+      numericInput("bmi", "BMI (Body Mass Index)", value = 25, min = 0, step = 0.1),
+      numericInput("waist_circumference", "Waist Circumference (cm)", value = 80, min = 0, step = 1),
+      actionButton("calculate", "Calculate BioAge", class = "btn-primary"),
+      br(),
+      br(),
+      downloadButton("downloadReport", "Download Report", class = "btn-success")
+    ),
+    mainPanel(
+      h3("Result"),
+      p(
+        "Once you calculate your BioAge, a summary will appear in a popup window. ",
+        "Additionally, you can download a detailed report as a PDF using the button above."
+      )
+    )
+  )
+)