---
title: "Coverage"
output: html_document
---

```{r setup, include=FALSE}
library(printr)
knitr::opts_chunk$set(echo = FALSE)
```

```{r init}
coverage <- function() {
    fileNames <- list.files(pattern="euler[0-9]{4}[.][a-zA-Z]+",recursive=T)
    truncatedNames <- gsub("/euler[0-9]{4}", "", fileNames)
    rawSolvedProblems <- unlist(strsplit(truncatedNames, split="[.]"))

    solvedProblems <- matrix(FALSE, nrow=length(rawSolvedProblems)/2, ncol=2)
    solvedProblems[,1] <- rawSolvedProblems[seq(2,length(rawSolvedProblems),by=2)]
    solvedProblems[,2] <- rawSolvedProblems[seq(1,length(rawSolvedProblems),by=2)]

    usedLanguages <- sort(unique(solvedProblems[,1]))
    problemNrs <- unique(solvedProblems[,2])
    solvedStateMatrix <- matrix(data=FALSE,nrow=length(usedLanguages),ncol=length(problemNrs))
    rownames(solvedStateMatrix) <- usedLanguages
    colnames(solvedStateMatrix) <- problemNrs

    solvedStateMatrix[solvedProblems] <- TRUE
    solvedStateMatrix
}

summary.coverage <- function(x) {
    mostFrequent <- max(x)
    mostFrequentName <- names(which(x == mostFrequent, x))
    result <- structure(
        .Data=list(
            rawData=x,
            data=data.frame(factor(names(x)), x),
            max=mostFrequent, 
            maxName=mostFrequentName
        )
    )
    result
}

coverageMat <- coverage()
langStats <- summary.coverage(rowSums(coverageMat))
problemStats <- summary.coverage(colSums(coverageMat))

w <- writeLines
```

## General

```{r general1}
foo <- coverageMat
foo[foo==T] <- "✔"
foo[foo==F] <- "✘"
t(foo)
```

```{r general2}
texts <- c("Total languages used:", "Total problems solved:")
values <- c(nrow(coverageMat), ncol(coverageMat))
as.matrix(paste(texts, values))
```

## Language Statistics

### Data:
```{r languages1}
as.matrix(t(langStats$rawData))
```

```{r languages2}
plot(langStats$data)
```

### Most used language(s):
```{r languages3}
as.matrix(paste(langStats$maxName, "with", langStats$max, "solved problems"))
```

## Problems Statistics

### Data:
```{r problems1}
problemStats$rawData
```

```{r problems2}
plot(problemStats$data)
```

### Most solved problem(s):
```{r problems3}
as.matrix(paste(problemStats$maxName, "with", problemStats$max, "solutions"))
```