#ifndef PEBBLISP_PLFUNC_H
#define PEBBLISP_PLFUNC_H

#include "pebblisp.h"

#define BASIC_OP(_name) \
    Object _name(Object* params, int length, struct Environment* env)

BASIC_OP(add);

BASIC_OP(sub);

BASIC_OP(mul);

BASIC_OP(dvi);

BASIC_OP(mod);

BASIC_OP(equ);

BASIC_OP(gth);

BASIC_OP(lth);

BASIC_OP(and);

BASIC_OP(or);

#undef BASIC_OP

fn(catObjects,
   "Concatenate string versions of the given objects.",
   "(cat \"Stuff: \" (1 2 3))", "Stuff: ( 1 2 3 )",
); // (Object obj1, Object obj2, struct Environment* env);

fn(filter,
   "Filter a list based on the given condition.",
   "(fil (< 50) (25 60 100))", "( 60 100 )",
); // (Object condition, Object list, struct Environment* env);

fn(append,
   "Append the given element. Creates a new list.",
   "(ap (1 2) 3)", "( 1 2 3 )",
); // (Object list, Object newElement, struct Environment* env);

fn(prepend,
   "Prepend the given element. Creates a new list",
   "(pre (2 3) 1)", "( 1 2 3 )",
); // (Object list, Object newElement, struct Environment* env);

fn(len,
   "Returns the length of the given list, or a NOT_A_LIST error if the expression is not a list.",
   "(len (2 3))", "2",
   "(len ())", "0",
   "(len \"string\")", "NOT_A_LIST",
); // (Object obj1, Object o_ignore, struct Environment* e_ignore);

fn(reduce,
   "Performs a simple reduction. Does not currently work with lambdas.\n"
   "Takes two arguments:\n"
   " - A two-element list: (`values` `initial`)\n"
   " - A function to apply to each value.",
   "(reduce (5 6) +)", "11",
   "(reduce ((1 2 3) 0) +)", "6",
); // (Object listInitial, Object func, struct Environment* env);

fn(at,
   "Get item at the given index in the given list.",
   "(at 1 (1 2 3))", "2",
   "(at 99 (1 2 3))", "INDEX_PAST_END",
   "(at 99 \"string\")", "INDEX_PAST_END",
); // (Object index, Object list, struct Environment* env);

fn(rest,
   "Get the tail of a list. All but the first element.",
   "(rest (1 2 3))", "( 2 3 )",
   "(rest ())", "( )",
   "(rest \"string\")", "( )",
); // (Object list, Object ignore, struct Environment* env);

fn(reverse,
   "Reverse a list.",
   "(rev (1 2 3))", "( 3 2 1 )",
   "(rev \"string\")", "NOT_A_LIST",
); // (Object _list, Object ignore, struct Environment* ignore2);

fn(isNum,
   "Returns `T` only if the argument evaluates to a number.",
   "(isnum 1)", "T",
   "(isnum (+ 5 5))", "T",
   "(isnum '(+ 5 5))", "F",
   "(isnum \"Hello\")", "F",
); // (Object test, Object ignore, struct Environment* ignore2);

fn(isList,
   "Returns `T` only if the argument is a list.",
   "(islist (1 2 3))", "T",
   "(islist ())", "T",
   "(islist \"Stringy\")", "F",
); // (Object test, Object ignore, struct Environment* ignore2);

fn(isString,
   "Returns `T` only if the argument is a string.",
   "(isstr \"Heyo\")", "T",
   "(isstr \"\")", "T",
   "(isstr (cat 5 5))", "T",
   "(isstr 10)", "F",
); // (Object test, Object ignore, struct Environment* ignore2);

fn(isErr,
   "Check if the argument is an error.",
   "(iserr (at 10 ()))", "T",
   "(iserr 5)", "F",
); // (Object test, Object ignore, struct Environment* ignore2);

fn(charAt,
   "Get the char in the given string at the given index.",
   "(chat \"Hello\" 1)", "e",
   "(chat \"Hello\" 10)", "",
); // (Object string, Object at, struct Environment* ignore);

fn(charVal,
   "Get the ascii integer representaton of the given character.",
   "(char \"h\")", "104",
   "(char \"hello\")", "104",
   "(char \"\")", "0",
); // (Object test, Object ignore, struct Environment* ignore2);

fn(parseEvalO,
   "Evaluate the given string or quoted list.",
   "(eval \"(1 2 3)\")", "( 1 2 3 )",
   "(eval '(+ 5 5))", "10",
); // (Object text, Object ignore, struct Environment* env);

fn(possessive,
   "(struct Post (title body))\n"
   "(def p (Post \"TI\" \"BO\"))\n"
   "p's title => TI"
); // (Object structo, Object field, struct Environment* env);

#ifdef STANDALONE

fn(print, "Prints the string representation of the given object to stdout.");
//(Object p, Object ignore, struct Environment* ignore2);

fn(pChar, "Prints the ascii character for the given number value.");
//(Object c, Object i1, struct Environment* i2);

fn(printEnvO, "Prints out the current scoped environment.");
//(Object i1, Object i2, struct Environment* env);

fn(systemCall,
   "Opens a shell and runs the given command, returning the command's exit code.\n"
   "(sys \"echo yee\")\n"
   "yee\n"
   "=> 0"
); // (Object process, Object _, struct Environment* env);

fn(loadFile,
   "Loads and parses the given file.\n"
   "Returns 0 if the file was loaded and parsed successfully. Otherwise 1.\n"
   "(loadfile \"printdate.pl\")\n"
   "Mon 21 Mar 2022 10:35:03 AM EDT\n"
   "=> 0"
); // (Object filename, Object _, struct Environment* env);

fn(takeInput,
   "Take console input with an optional prompt. For example:\n"
   "`(def x (input))` will wait for user input with no prompt.\n"
   "`(def x (input \">> \"))` wait for input, but prompt the user with '>> '.\n"
); // (Object i1, Object i2, struct Environment* i3);

fn(help,
   "Displays help text for the given function.\n"
   "Currently requires the function name as a string, but future syntactic sugar may\n"
   "loosen this requirement.\n"
   "(? \"+\") => \"(+ 1 2) => 3\""
); // (Object symbol, Object ignore, struct Environment* ignore2);

fn(readFileToObject,
   "Read a file into a string object."
); // (Object filename, Object ignore, struct Environment* ignore2);

#endif // STANDALONE

#endif // PEBBLISP_PLFUNC_H