app "main"
    packages { pf: "platform/main.roc" }
    imports [Parser.Core.{Parser}, Parser.Str.{RawStr}, Parser.CSV.{CSV}]
    provides [main] to pf

# Until issue https://github.com/rtfeldman/roc/issues/3438 is fixed,
# use the simple 'hello world' platform for testing
# with hard-coded input.

main =
  when Parser.CSV.parseStr userCSVParser "John,Doe,10\r\nRichard,Feldman,100\r\nMarten,Wijnja,28\r\n" is
    Ok result ->
        val = result |> Str.joinWith("\n")
        nResults = List.len result |> Num.toStr
        "Parse success!\n\n\(nResults) users were found:\n\(val)\n"
    Err problem ->
      when problem is
        ParsingFailure failure ->
          "Parsing failure: \(failure)\n"
        ParsingIncomplete leftover ->
          leftoverStr = leftover |> List.map Parser.Str.strFromRaw |> Str.joinWith ", "
          "Parsing incomplete. Following still left: \(leftoverStr)\n"
        SyntaxError error ->
          "Parsing failure. Syntax error in the CSV: \(error)"
# main = fullTest csvParser "10,20\n\"An escaped field!\"\"\n,,,\",30\n"
# main = partialTest fieldParser "\"An escaped field with some \"\"<- double quotes\""
# main = fullTest fieldContentsParser "My very cool,\"\"\r\n string"
# main = partialTest betweenParser "\"this is a test\"\" to see\""
# main = partialTest manyParser "this is a very long string\"\""

userCSVParser =
  Parser.CSV.record (\first -> \last -> \age ->
    ageStr = Num.toStr age
    "User: \(first) \(last) \(ageStr)")
  |> Parser.Core.apply (Parser.CSV.field Parser.CSV.string)
  |> Parser.Core.apply (Parser.CSV.field Parser.CSV.string)
  |> Parser.Core.apply (Parser.CSV.field Parser.CSV.nat)

partialTest = \parser, input ->
  when Parser.Str.parseStrPartial parser input is
    Ok result ->
      # val = result.val |> Str.joinWith("\r\n")
      val = result.val
      leftover = result.input
      "Parse success: \(val) (leftover string: \(leftover))\n"
    Err (ParsingFailure problem) ->
      "Parse failure: \(problem)\n"

fullTest = \parser, input ->
  when Parser.Str.parseStr parser input is
    Ok result ->
      # val = result |> Str.joinWith(", ")
      val = result |> Str.joinWith("\r\n")
      # val = result
      "Parse success: \(val)\n"
    Err (ParsingFailure problem) ->
      "Parse failure: \(problem)\n"
    Err (ParsingIncomplete leftover) ->
      "Parse failure: Expected to reach end of input, but the following was still left: `\(leftover)`\n"

# betweenParser : Parser RawStr Str
# betweenParser =
#   Parser.Core.between manyParser (Parser.Str.codepoint 34) (Parser.Str.codepoint 34)

# manyParser : Parser RawStr Str
# manyParser =
#   Parser.Str.string "\"\"" |> Parser.Core.map(\_ -> 34) # Escaped double quote
#   |> Parser.Core.alt (Parser.Str.codepoint 44) # Comma
#   |> Parser.Core.alt (Parser.Str.codepoint 13) # CR
#   |> Parser.Core.alt (Parser.Str.codepoint 10) # LF
#   |> Parser.Core.alt (Parser.Str.codepointSatisfies (\x -> (x >= 32 && x <= 33) || (x >= 35 && x <= 43) || (x >= 45 && x <= 126))) # Any printable char except " (34) and , (44)
#   |> Parser.Core.many
#   |> Parser.Core.map (\field -> field |> Str.fromUtf8 |> Result.withDefault "Should not happen")

# fieldContentsParser : Parser RawStr Str
# fieldContentsParser =
#   Parser.CSV.escapedContents
#   |> Parser.Core.map (\field -> field |> Str.fromUtf8 |> Result.withDefault "Should not happen")

# fieldParser : Parser RawStr Str
# fieldParser =
#   Parser.CSV.escapedField
#   |> Parser.Core.map (\field -> field |> Str.fromUtf8 |> Result.withDefault "Should not happen")

# csvParser : Parser RawStr (List Str)
# csvParser =
#   Parser.CSV.file
#   |> Parser.Core.map \records ->
#     records
#     |> List.map (\record ->
#       record
#       |> List.map (\field ->
#         field
#         |> Str.fromUtf8
#         |> Result.withDefault "Unexpected problem while turning a List U8 back into a Str")
#       |> Str.joinWith ", ")