library(shiny)
library(dplyr)
library(pointblank)

# Create the sample dataset
data <- tibble(
  a = c(100, 150, 200, 105, 70),
  b = c(102, 148, 210, 110, 500)
)

# Define the custom function in the global environment
equal_within <- function(x, y, percent) {
  abs(x - y) / abs(pmin(x, y)) <= percent / 100
}
assign("equal_within", equal_within, envir = .GlobalEnv)  # Explicit assignment

# Define the Shiny app
ui <- fluidPage(
  titlePanel("Pointblank Agent Report"),
  sidebarLayout(
    sidebarPanel(
      actionButton("generate", "Generate Agent Report"),
      downloadButton("download_report", "Download Report")
    ),
    mainPanel(
      h4("Generated Report"),
      uiOutput("agent_report")
    )
  )
)

server <- function(input, output, session) {
  # Reactive value to store the agent
  agent <- reactiveVal(NULL)

  # Generate the agent and report when button is clicked
  observeEvent(input$generate, {
    # Generate the agent
    generated_agent <-
      create_agent(tbl = data) |>
      col_vals_gt(columns = a, value = vars(b)) |>
      col_vals_lt(columns = a, value = vars(b)) |>
      col_vals_equal(columns = a, value = vars(b)) |>
      col_vals_expr(expr = expr(equal_within(a, b, 5))) |>
      interrogate()

    # Store the agent in a reactive value
    agent(generated_agent)

    # Save the report to the 'www' directory
    report_path <- file.path("www", "agent_report.html")
    export_report(agent(), filename = report_path)

    # Notify the user
    showNotification("Report generated successfully!", type = "message")
  })

  # Display the report in the main panel
  output$agent_report <- renderUI({
    req(agent())  # Ensure the agent exists
    tags$iframe(
      src = "agent_report.html",
      width = "100%",
      height = "600px",
      frameborder = "0"
    )
  })

  # Provide a download handler for the report
  output$download_report <- downloadHandler(
    filename = function() {
      "agent_report.html"
    },
    content = function(file) {
      file.copy(file.path("www", "agent_report.html"), file)
    }
  )
}

shinyApp(ui = ui, server = server)