#
# RESULTS
#

# Results with pagination
getFilteredResultsForTeam <- function(input) {
  getMatchesForTeam(football_data, input$team) %>%
    filterByDate(as_date(input$date_range_for_team[1]), as_date(input$date_range_for_team[2]))
}

getFilteredResults <- function(input) {
  getMatchesList(football_data, input$first_team, input$second_team) %>%
    filterByDate(as_date(input$date_range[1]), as_date(input$date_range[2]))
}

resultsWithPagination <- function(input, output) {
  output$results_pagination <- DT::renderDataTable(
    getFilteredResults(input),
    extensions = 'Buttons',
    options = list(
      lengthMenu = list(c(5, 10, -1), c('5', '10', 'All')),
      pageLength = 10,
      searching = FALSE
    )
  )
}

matchesForTeam <- function(input, output) {
  output$matches_for_team <- DT::renderDataTable(
    getFilteredResultsForTeam(input),
    extensions = 'Buttons',
    options = list(
      lengthMenu = list(c(5, 10, -1), c('5', '10', '20', 'All')),
      pageLength = 20,
      searching = FALSE
    )
  )
}

# Balance
balanceBetweenTeams <- function(input, output) {
  output$balance <- renderPlot({
    ggplot(getFilteredResults(input), aes(x=as.factor(winner),
                                      fill=as.factor(n))) +
      geom_bar(fill = rgb(0.1,0.4,0.5,0.7)) +
      theme_minimal() +
      labs(x = "", y = "Number of matches")
  })
}

getBalanceDataForTeamBarplot <- function(input) {
  return(
    getBalanceForTeam(getFilteredResultsForTeam(input), input$team)
  )
}

balanceForTeamBarplot <- function(input, output) {
  output$balance_for_team <- renderPlot({
    ggplot(getBalanceDataForTeamBarplot(input),
           aes(x=as.factor(winner), y=as.factor(n))) +
      geom_bar(stat = "identity", fill = rgb(0.6, 0.1, 0.4, 0.7)) +
      theme_minimal() +
      labs(x = "", y = "Matches balance for")
  })
}

# Balance percentage
getBalanceData <- function(input) {
  getBalance(getFilteredResults(input))
}

balancePercentage <- function(input, output) {
  output$balancePieChart <- renderPlot({
    ggplot(getBalancePercentage(getBalanceData(input))) +
      geom_bar(
        aes(x="", y=percentage, fill=winner),
        stat = "identity") +
      coord_polar("y", start = 0) + 
      theme_void() + 
      geom_text(aes(x=1,
                    y = cumsum(percentage) - percentage/2,
                    label = percent(percentage)))
  })
}

# Summary statistics
summaryStatistics <- function(input, output) {
  output$summary_statistics <- renderTable(
    goalsScored(getFilteredResultsForTeam(input), input$team)
  )
}