import toml;

public{
  import std.stdio : writeln;
  import std.file : read;
  import std.array;
  import std.string;
  import std.uni : isWhite, isAlpha, isAlphaNum;
  import std.ascii : isDigit;
  import std.conv : to;
  import std.algorithm;
  import std.sumtype : SumType;
}

import dopp_lexer : tokenize, isKeyword;
import dopp_parser : parse;


TOMLDocument toml_s;


export enum TokenType{
  Identifier, // todo split to Type - Function - Variable
  Keyword,
  Integer,
  Float,
  String,
  Symbol,
  Whitespace, // maybe todo add equals and other (=, >=, <=, ==) - needs or not ?
  Comment_Line,
  New_Line,
  Match_Any
}


export struct Token{
  TokenType type;
  string lexeme;
  
  // for debug
  string toString(){
    import std.format : format;
    //return "Token(type: %d, lexeme: %s)".format(type, lexeme);
    //return "Token = type: %d, lexeme: %s\n".format(type, lexeme);
    return "Token = type: %d, lexeme: %s\n".format(type, ( (TokenType.New_Line == type) ? `\n` : lexeme) );
  }
}



// ./dopp -t == shortened for test (onto single .de -> .d module)
// ./dopp -d "/test" -o "/test2" == input dir path + output dir path (default output dir = input dir)
// ./dopp -f test.de -o test.d == input file name + output file name (default output file name = input file name [but .d instead .de] )
// ./dopp -f "/test/test.de" -o "/result/test.d" == input file path + output file path (default output file name and path = input file name and path [but .d instead .de] )
bool is_valid_argv(ref string[] argv){
  ulong num = argv.length; // uint64
  if(num != 1 && num != 2 && num != 4){
    return false;
  
  }else if(num == 1){ // one argument only (just filename or /path/filename) == shortened ./dopp -f test.de = ./dopp test.de; or -t == shortened for test (onto single .de -> .d module)
    if( (argv[0] == "-t") || (argv[0].length >= 4 && argv[0][$-3 .. $] == ".de") ){
      return true;
    }else{
      return false;
    }
  
  }else if(num == 2){ // two arguments = input file name/path or input dir path
    if(argv[0] != "-d" && argv[0] != "-f"){
      return false;
    
    }else if(argv[0] == "-f"){ // must be file
       if(argv[1].length >= 4 && argv[1][$-3 .. $] == ".de"){
         return true;
       }else{
         return false;
       }
    
    }else{ // dir
      if(argv[1].length > 0){
        return true;
      }else{
        return false;
      }
    }
  
  }else{ // num == 4
    string[] argv2 = argv[0 .. 2];
    if( is_valid_argv(argv2) ){ // valid first 2
      string[] argv4 = argv[2 .. $];
      if( argv[2] != "-o" ){ // valid next - last 2
        return false;
      }else if(argv[0] == "-f"){ // must be file
        if(argv[3].length >= 3 && argv[3][$-2 .. $] == ".d"){
          return true;
        }else{
          return false;
        }
      
      }else{ // dir
        if(argv[3].length > 0){
          return true;
        }else{
          return false;
        }
      }
      
    }else{
      return false;
    }
  }
}


//alias Config_Value = SumType!(string, int, ubyte, bool);
alias Config_Value = SumType!(string, ubyte, bool);

Config_Value get_config_value(ref TOMLDocument toml_s, string key){
  if(key == "indent_matter"){
    ubyte default_indent_matter = 4;
    if(("indent_matter" in toml_s) != null){
      if(toml_s[key].type == TOMLType.INTEGER){
        ubyte indent_matter = cast(ubyte) toml_s[key].integer; // long (int64) -> ubyte (uint8) // todo add alias
        if(indent_matter > 0){
          return Config_Value(indent_matter);
        }
      }
    }
    writeln("Warning: use default indent_matter = ", default_indent_matter); // todo add config key-value "no_warn" = false | true for silence
    return Config_Value(default_indent_matter);
  
  }else if(key == "indent_out"){
    ubyte default_indent_out = 2;
    if(("indent_out" in toml_s) != null){
      if(toml_s[key].type == TOMLType.INTEGER){
        ubyte indent_out = cast(ubyte) toml_s[key].integer; // long (int64) -> ubyte (uint8)
        if(indent_out > 0){
          return Config_Value(indent_out);
        }
      }
    }
    writeln("Warning: use default indent_out = ", default_indent_out);
    return Config_Value(default_indent_out);
  
  }else if(key == "indent_type"){ // 0 = whitespaces, 1 = tabs
    ubyte default_indent_type = 0;
    if(("indent_type" in toml_s) != null){
      if(toml_s[key].type == TOMLType.INTEGER){
        ubyte indent_type = cast(ubyte) toml_s[key].integer; // long (int64) -> ubyte (uint8)
        if(indent_type < 2){ // 0 | 1
          return Config_Value(indent_type);
        }
      }
    }
    writeln("Warning: use default indent_type = ", default_indent_type);
    return Config_Value(default_indent_type);
  
  //}else{}
  
  }
  return Config_Value(0);
}


//void main(string[] argv){
int main(string[] argv){
  
  toml_s = parseTOML(cast(string)read("dopp.toml"));
  
  /*
  writeln("indent_matter: ", toml_s["indent_matter"]); // 4
  //writeln("xyz: ", toml_s["xyz"]); // Address boundary error || Segmentation fault (core dumped)
  writeln("indent_matter in: ", "indent_matter" in toml_s); // hex like 7F27C2992040
  writeln("indent_matter is null: ", ("indent_matter" in toml_s) == null); // fasle
  writeln("indent_matter is TOMLType.INTEGER: ", (toml_s["indent_matter"].type == TOMLType.INTEGER)); // true
  writeln("xyz in: ", "xyz" in toml_s); // null
  writeln("xyz is null: ", ("xyz" in toml_s) == null); // true
  */
  
  
  auto indent_type = get_config_value(toml_s, "indent_type");
  //writeln("config: indent_type = ", indent_type); // 0 // todo add config key-value "no_warn" = false | true for silence
  
  auto indent_matter = get_config_value(toml_s, "indent_matter");
  //writeln("config: indent_matter = ", indent_matter); // 4
  
  auto indent_out = get_config_value(toml_s, "indent_out");
  //writeln("config: indent_out = ", indent_out); // 2
  
  
  /*
  int i = 0;
  foreach(string s; argv[1 .. $]){
    writeln(s);
    i++;
  }
  writeln("i = ", i);
  */
  
  string[] argv1 = argv[1 .. $]; // argv[0] always = program name ( ./dopp in my case in linux )
  bool valid_argv = is_valid_argv(argv1);
  // writeln("valid_argv = ", valid_argv); // todo add config key-value "no_warn" = false | true for silence
  
  if(!valid_argv){
    return 0;
  }
  
  
  
  //string source = `if (x > 0) { writeln("Positive"); }`;
  /+
  string source = q"[
  if (x > 0) {
    writeln("Pos`it`i've'");
  }
  ]";
  +/
  
  //string str1 = "this is test"; // valid in dlang
  //string str1 = "this \"is\" test"; // valid in dlang
  //string str1 = "this `is` test"; // valid in dlang
  //string str1 = `this "is" test`; // valid in dlang
  // //string str1 = `this `is` test`; // not valid in dlang - but valid in my lexer-parser
  //string str1 = `this ` ~ "`is`" ~ ` test`; // valid in dlang
  // todo add to lexer r" .. ";
  // todo add to lexer multiline q"[ .. ]";
  // todo add to lexer //string str1 = x"48 65 6C 6C 6F"; // valid in dlang - hex string // Hello
  //writeln(str1);
  
  //writeln("hey" ~ '\n' ~ "hello");
  
  string source = q"[
auto y1 = "this is test";
auto y2 = "this \"is\" test";
auto y3 = `this "is" test`; // this is single line comment
auto y4 = `this is test`;
auto y5 = `this `is` test`;
  ]"; // "
  
/+
  string source = q"[
auto x = 5;
auto x2 = 5_001;
auto y1 = "this is test";
auto y2 = "this \"is\" test";
auto y3 = `this "is" test`;
auto z = 1;
  ]"; // "
  +/
  
  /+
  string source = q"[
void main(){
  auto x = 5;
  auto y = ptn x
    1 = 1
    5 = 5 * 2
    9 = 9 * 3
    _ = x * 4
}
  ]";
  +/
  
  auto tokens = tokenize(source, 0, 2); // indent_type = 0 = whitespace; indent_matter = 2 (whitespaces)
  writeln(tokens);
  auto result = parse(tokens); // indent_out = 2 (whitespaces in output-generated code)
  writeln(result);
  
  /+
void main(){
  auto x = 5;
  if(x == 1){
    y = 1;
  }else if(x == 5){
    y = 5 * 2; // return x * 2;
  }else if(x == 9){
    y = 9 * 3; // return x * 3;
  }else{ // other cases
    y = x * 4;
  }
}
  +/
  
  
  return 1;
}


unittest{
  assert( is_valid_argv([]) == false );
  assert( is_valid_argv([""]) == false );
  assert( is_valid_argv(["-t"]) == true );
  assert( is_valid_argv(["-d"]) == false );
  assert( is_valid_argv(["-d", ""]) == false );
  assert( is_valid_argv(["-d", "/test"]) == true );
  assert( is_valid_argv(["-d", "/test", "-o", "/test2"]) == true );
  assert( is_valid_argv(["test.de"]) == true );
  assert( is_valid_argv(["-f", "test.de"]) == true );
  assert( is_valid_argv(["-f", "test.de", "-o", "test.d"]) == true );
  assert( is_valid_argv(["test.txt"]) == false );
  assert( is_valid_argv(["-f", "test.txt"]) == false );
  assert( is_valid_argv(["-f", "test.txt", "-o", "test.d"]) == false );
  assert( is_valid_argv(["-f", "test.de", "-o", "test.txt"]) == false );
}

// ./dopp -t == shortened for test (onto single .de -> .d module)
// ./dopp -d "/test" -o "/test2" == input dir path + output dir path (default output dir = input dir)
// ./dopp -f test.de -o test.d == input file name + output file name (default output file name = input file name [but .d instead .de] )
// ./dopp -f "/test/test.de" -o "/result/test.d" == input file path + output file path (default output file name and path = input file name and path [but .d instead .de] )