/*************************************************************************/
/*  array.cpp                                                            */
/*  From https://github.com/Relintai/pandemonium_engine (MIT)            */
/*************************************************************************/

//--STRIP
#include "array.h"

#include "core/hashfuncs.h"
#include "core/vector.h"
#include "object/object.h"
#include "object/variant.h"
#include "core/ustring.h"
//--STRIP

class ArrayPrivate {
public:
	SafeRefCount refcount;
	Vector<Variant> array;
};

void Array::_ref(const Array &p_from) const {
	ArrayPrivate *_fp = p_from._p;

	ERR_FAIL_COND(!_fp); // should NOT happen.

	if (_fp == _p) {
		return; // whatever it is, nothing to do here move along
	}

	bool success = _fp->refcount.ref();

	ERR_FAIL_COND(!success); // should really not happen either

	_unref();

	_p = p_from._p;
}

void Array::_unref() const {
	if (!_p) {
		return;
	}

	if (_p->refcount.unref()) {
		memdelete(_p);
	}
	_p = nullptr;
}

Variant &Array::operator[](int p_idx) {
	return _p->array.write[p_idx];
}

const Variant &Array::operator[](int p_idx) const {
	return _p->array[p_idx];
}

int Array::size() const {
	return _p->array.size();
}
bool Array::empty() const {
	return _p->array.empty();
}
void Array::clear() {
	_p->array.clear();
}

bool Array::deep_equal(const Array &p_array, int p_recursion_count) const {
	// Cheap checks
	ERR_FAIL_COND_V_MSG(p_recursion_count > MAX_RECURSION, true, "Max recursion reached");
	if (_p == p_array._p) {
		return true;
	}
	const Vector<Variant> &a1 = _p->array;
	const Vector<Variant> &a2 = p_array._p->array;
	const int size = a1.size();
	if (size != a2.size()) {
		return false;
	}

	// Heavy O(n) check
	p_recursion_count++;
	for (int i = 0; i < size; i++) {
		if (!a1[i].deep_equal(a2[i], p_recursion_count)) {
			return false;
		}
	}

	return true;
}

bool Array::operator==(const Array &p_array) const {
	return _p == p_array._p;
}

uint32_t Array::hash() const {
	return recursive_hash(0);
}

uint32_t Array::recursive_hash(int p_recursion_count) const {
	ERR_FAIL_COND_V_MSG(p_recursion_count > MAX_RECURSION, 0, "Max recursion reached");
	p_recursion_count++;

	uint32_t h = hash_murmur3_one_32(0);

	for (int i = 0; i < _p->array.size(); i++) {
		h = hash_murmur3_one_32(_p->array[i].recursive_hash(p_recursion_count), h);
	}
	return hash_fmix32(h);
}

void Array::operator=(const Array &p_array) {
	_ref(p_array);
}

void Array::push_back(const Variant &p_value) {
	_p->array.push_back(p_value);
}

void Array::append_array(const Array &p_array) {
	_p->array.append_array(p_array._p->array);
}

Error Array::resize(int p_new_size) {
	return _p->array.resize(p_new_size);
}

void Array::insert(int p_pos, const Variant &p_value) {
	_p->array.insert(p_pos, p_value);
}

void Array::fill(const Variant &p_value) {
	_p->array.fill(p_value);
}

void Array::erase(const Variant &p_value) {
	_p->array.erase(p_value);
}

Variant Array::front() const {
	ERR_FAIL_COND_V_MSG(_p->array.size() == 0, Variant(), "Can't take value from empty array.");
	return operator[](0);
}

Variant Array::back() const {
	ERR_FAIL_COND_V_MSG(_p->array.size() == 0, Variant(), "Can't take value from empty array.");
	return operator[](_p->array.size() - 1);
}

int Array::find(const Variant &p_value, int p_from) const {
	return _p->array.find(p_value, p_from);
}

int Array::rfind(const Variant &p_value, int p_from) const {
	if (_p->array.size() == 0) {
		return -1;
	}

	if (p_from < 0) {
		// Relative offset from the end
		p_from = _p->array.size() + p_from;
	}
	if (p_from < 0 || p_from >= _p->array.size()) {
		// Limit to array boundaries
		p_from = _p->array.size() - 1;
	}

	for (int i = p_from; i >= 0; i--) {
		if (_p->array[i] == p_value) {
			return i;
		}
	}

	return -1;
}

int Array::find_last(const Variant &p_value) const {
	return rfind(p_value);
}

int Array::count(const Variant &p_value) const {
	if (_p->array.size() == 0) {
		return 0;
	}

	int amount = 0;
	for (int i = 0; i < _p->array.size(); i++) {
		if (_p->array[i] == p_value) {
			amount++;
		}
	}

	return amount;
}

bool Array::has(const Variant &p_value) const {
	return _p->array.find(p_value, 0) != -1;
}

void Array::remove(int p_pos) {
	_p->array.remove(p_pos);
}

void Array::set(int p_idx, const Variant &p_value) {
	operator[](p_idx) = p_value;
}

const Variant &Array::get(int p_idx) const {
	return operator[](p_idx);
}

Array Array::duplicate(bool p_deep) const {
	Array new_arr;
	int element_count = size();
	new_arr.resize(element_count);
	for (int i = 0; i < element_count; i++) {
		new_arr[i] = p_deep ? get(i).duplicate(p_deep) : get(i);
	}

	return new_arr;
}

int Array::_clamp_slice_index(int p_index) const {
	int arr_size = size();
	int fixed_index = CLAMP(p_index, -arr_size, arr_size - 1);
	if (fixed_index < 0) {
		fixed_index = arr_size + fixed_index;
	}
	return fixed_index;
}

Array Array::slice(int p_begin, int p_end, int p_step, bool p_deep) const { // like python, but inclusive on upper bound

	Array new_arr;

	ERR_FAIL_COND_V_MSG(p_step == 0, new_arr, "Array slice step size cannot be zero.");

	if (empty()) { // Don't try to slice empty arrays.
		return new_arr;
	}
	if (p_step > 0) {
		if (p_begin >= size() || p_end < -size()) {
			return new_arr;
		}
	} else { // p_step < 0
		if (p_begin < -size() || p_end >= size()) {
			return new_arr;
		}
	}

	int begin = _clamp_slice_index(p_begin);
	int end = _clamp_slice_index(p_end);

	int new_arr_size = MAX(((end - begin + p_step) / p_step), 0);
	new_arr.resize(new_arr_size);

	if (p_step > 0) {
		int dest_idx = 0;
		for (int idx = begin; idx <= end; idx += p_step) {
			ERR_FAIL_COND_V_MSG(dest_idx < 0 || dest_idx >= new_arr_size, Array(), "Bug in Array slice()");
			new_arr[dest_idx++] = p_deep ? get(idx).duplicate(p_deep) : get(idx);
		}
	} else { // p_step < 0
		int dest_idx = 0;
		for (int idx = begin; idx >= end; idx += p_step) {
			ERR_FAIL_COND_V_MSG(dest_idx < 0 || dest_idx >= new_arr_size, Array(), "Bug in Array slice()");
			new_arr[dest_idx++] = p_deep ? get(idx).duplicate(p_deep) : get(idx);
		}
	}

	return new_arr;
}

struct _ArrayVariantSort {
	_FORCE_INLINE_ bool operator()(const Variant &p_l, const Variant &p_r) const {
		bool valid = false;
		Variant res;
		Variant::evaluate(Variant::OP_LESS, p_l, p_r, res, valid);
		if (!valid) {
			res = false;
		}
		return res;
	}
};

Array &Array::sort() {
	_p->array.sort_custom<_ArrayVariantSort>();
	return *this;
}

struct _ArrayVariantSortCustom {
	Object *obj;

	_FORCE_INLINE_ bool operator()(const Variant &p_l, const Variant &p_r) const {
		return obj->lt(p_l, p_r);
	}
};
Array &Array::sort_custom(Object *p_obj) {
	ERR_FAIL_COND_V(!p_obj, *this);

	SortArray<Variant, _ArrayVariantSortCustom, true> avs;
	avs.compare.obj = p_obj;
	avs.sort(_p->array.ptrw(), _p->array.size());
	return *this;
}

void Array::shuffle() {
	const int n = _p->array.size();
	if (n < 2) {
		return;
	}
	Variant *data = _p->array.ptrw();
	for (int i = n - 1; i >= 1; i--) {
		const int j = Math::rand() % (i + 1);
		const Variant tmp = data[j];
		data[j] = data[i];
		data[i] = tmp;
	}
}

template <typename Less>
_FORCE_INLINE_ int bisect(const Vector<Variant> &p_array, const Variant &p_value, bool p_before, const Less &p_less) {
	int lo = 0;
	int hi = p_array.size();
	if (p_before) {
		while (lo < hi) {
			const int mid = (lo + hi) / 2;
			if (p_less(p_array.get(mid), p_value)) {
				lo = mid + 1;
			} else {
				hi = mid;
			}
		}
	} else {
		while (lo < hi) {
			const int mid = (lo + hi) / 2;
			if (p_less(p_value, p_array.get(mid))) {
				hi = mid;
			} else {
				lo = mid + 1;
			}
		}
	}
	return lo;
}

int Array::bsearch(const Variant &p_value, bool p_before) {
	return bisect(_p->array, p_value, p_before, _ArrayVariantSort());
}

int Array::bsearch_custom(const Variant &p_value, Object *p_obj, const StringName &p_function, bool p_before) {
	ERR_FAIL_COND_V(!p_obj, 0);

	_ArrayVariantSortCustom less;
	less.obj = p_obj;

	return bisect(_p->array, p_value, p_before, less);
}

Array &Array::invert() {
	_p->array.invert();
	return *this;
}

void Array::push_front(const Variant &p_value) {
	_p->array.insert(0, p_value);
}

Variant Array::pop_back() {
	if (!_p->array.empty()) {
		const int n = _p->array.size() - 1;
		const Variant ret = _p->array.get(n);
		_p->array.resize(n);
		return ret;
	}
	return Variant();
}

Variant Array::pop_front() {
	if (!_p->array.empty()) {
		const Variant ret = _p->array.get(0);
		_p->array.remove(0);
		return ret;
	}
	return Variant();
}

Variant Array::pop_at(int p_pos) {
	if (_p->array.empty()) {
		// Return `null` without printing an error to mimic `pop_back()` and `pop_front()` behavior.
		return Variant();
	}

	if (p_pos < 0) {
		// Relative offset from the end
		p_pos = _p->array.size() + p_pos;
	}

	ERR_FAIL_INDEX_V_MSG(
			p_pos,
			_p->array.size(),
			Variant(),
			vformat(
					"The calculated index %s is out of bounds (the array has %s elements). Leaving the array untouched and returning `null`.",
					p_pos,
					_p->array.size()));

	const Variant ret = _p->array.get(p_pos);
	_p->array.remove(p_pos);
	return ret;
}

Variant Array::min() const {
	Variant minval;
	for (int i = 0; i < size(); i++) {
		if (i == 0) {
			minval = get(i);
		} else {
			bool valid;
			Variant ret;
			Variant test = get(i);
			Variant::evaluate(Variant::OP_LESS, test, minval, ret, valid);
			if (!valid) {
				return Variant(); //not a valid comparison
			}
			if (bool(ret)) {
				//is less
				minval = test;
			}
		}
	}
	return minval;
}

Variant Array::max() const {
	Variant maxval;
	for (int i = 0; i < size(); i++) {
		if (i == 0) {
			maxval = get(i);
		} else {
			bool valid;
			Variant ret;
			Variant test = get(i);
			Variant::evaluate(Variant::OP_GREATER, test, maxval, ret, valid);
			if (!valid) {
				return Variant(); //not a valid comparison
			}
			if (bool(ret)) {
				//is less
				maxval = test;
			}
		}
	}
	return maxval;
}

const void *Array::id() const {
	return _p;
}

String Array::sprintf(const String &p_format, bool *error) const {
	String formatted;
	CharType *self = (CharType *)p_format.get_data();
	bool in_format = false;
	int value_index = 0;
	int min_chars = 0;
	int min_decimals = 0;
	bool in_decimals = false;
	bool pad_with_zeros = false;
	bool left_justified = false;
	bool show_sign = false;

	const Array &values = *this;

	if (error) {
		*error = true;
	}

	for (; *self; self++) {
		const CharType c = *self;

		if (in_format) { // We have % - let's see what else we get.
			switch (c) {
				case '%': { // Replace %% with %
					formatted += p_format.chr(c);
					in_format = false;
					break;
				}
				case 'd': // Integer (signed)
				case 'o': // Octal
				case 'x': // Hexadecimal (lowercase)
				case 'X': { // Hexadecimal (uppercase)
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					if (!values[value_index].is_num()) {
						return "a number is required";
					}

					int64_t value = values[value_index];
					int base = 16;
					bool capitalize = false;
					switch (c) {
						case 'd':
							base = 10;
							break;
						case 'o':
							base = 8;
							break;
						case 'x':
							break;
						case 'X':
							base = 16;
							capitalize = true;
							break;
					}
					// Get basic number.
					String str = String::num_int64(ABS(value), base, capitalize);
					int number_len = str.length();

					// Padding.
					int pad_chars_count = (value < 0 || show_sign) ? min_chars - 1 : min_chars;
					String pad_char = pad_with_zeros ? String("0") : String(" ");
					if (left_justified) {
						str = str.rpad(pad_chars_count, pad_char);
					} else {
						str = str.lpad(pad_chars_count, pad_char);
					}

					// Sign.
					if (show_sign || value < 0) {
						String sign_char = value < 0 ? "-" : "+";
						if (left_justified) {
							str = str.insert(0, sign_char);
						} else {
							str = str.insert(pad_with_zeros ? 0 : str.length() - number_len, sign_char);
						}
					}

					formatted += str;
					++value_index;
					in_format = false;

					break;
				}
				case 'f': { // Float
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					if (!values[value_index].is_num()) {
						return "a number is required";
					}

					double value = values[value_index];
					bool is_negative = (value < 0);
					String str = String::num(ABS(value), min_decimals);
					bool not_numeric = isinf(value) || isnan(value);

					// Pad decimals out.
					if (!not_numeric) {
						str = str.pad_decimals(min_decimals);
					}

					int initial_len = str.length();

					// Padding. Leave room for sign later if required.
					int pad_chars_count = (is_negative || show_sign) ? min_chars - 1 : min_chars;
					String pad_char = (pad_with_zeros && !not_numeric) ? String("0") : String(" "); // Never pad NaN or inf with zeros
					if (left_justified) {
						str = str.rpad(pad_chars_count, pad_char);
					} else {
						str = str.lpad(pad_chars_count, pad_char);
					}

					// Add sign if needed.
					if (show_sign || is_negative) {
						String sign_char = is_negative ? "-" : "+";
						if (left_justified) {
							str = str.insert(0, sign_char);
						} else {
							str = str.insert(pad_with_zeros ? 0 : str.length() - initial_len, sign_char);
						}
					}

					formatted += str;
					++value_index;
					in_format = false;
					break;
				}
				case 's': { // String
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					String str = values[value_index];
					// Padding.
					if (left_justified) {
						str = str.rpad(min_chars);
					} else {
						str = str.lpad(min_chars);
					}

					formatted += str;
					++value_index;
					in_format = false;
					break;
				}
				case 'c': {
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					// Convert to character.
					String str;
					if (values[value_index].is_num()) {
						int value = values[value_index];
						if (value < 0) {
							return "unsigned integer is lower than minimum";
						} else if (value >= 0xd800 && value <= 0xdfff) {
							return "unsigned integer is invalid Unicode character";
						} else if (value > 0x10ffff) {
							return "unsigned integer is greater than maximum";
						}
						str = p_format.chr(values[value_index]);
					} else if (values[value_index].get_type() == Variant::STRING) {
						str = values[value_index];
						if (str.length() != 1) {
							return "%c requires number or single-character string";
						}
					} else {
						return "%c requires number or single-character string";
					}

					// Padding.
					if (left_justified) {
						str = str.rpad(min_chars);
					} else {
						str = str.lpad(min_chars);
					}

					formatted += str;
					++value_index;
					in_format = false;
					break;
				}
				case '-': { // Left justify
					left_justified = true;
					break;
				}
				case '+': { // Show + if positive.
					show_sign = true;
					break;
				}
				case '0':
				case '1':
				case '2':
				case '3':
				case '4':
				case '5':
				case '6':
				case '7':
				case '8':
				case '9': {
					int n = c - '0';
					if (in_decimals) {
						min_decimals *= 10;
						min_decimals += n;
					} else {
						if (c == '0' && min_chars == 0) {
							if (left_justified) {
								LOG_WARN("'0' flag ignored with '-' flag in string format");
							} else {
								pad_with_zeros = true;
							}
						} else {
							min_chars *= 10;
							min_chars += n;
						}
					}
					break;
				}
				case '.': { // Float separator.
					if (in_decimals) {
						return "too many decimal points in format";
					}
					in_decimals = true;
					min_decimals = 0; // We want to add the value manually.
					break;
				}

				case '*': { // Dynamic width, based on value.
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					if (!values[value_index].is_num()) {
						return "* wants number";
					}

					int size = values[value_index];

					if (in_decimals) {
						min_decimals = size;
					} else {
						min_chars = size;
					}

					++value_index;
					break;
				}

				default: {
					return "unsupported format character";
				}
			}
		} else { // Not in format string.
			switch (c) {
				case '%':
					in_format = true;
					// Back to defaults:
					min_chars = 0;
					min_decimals = 6;
					pad_with_zeros = false;
					left_justified = false;
					show_sign = false;
					in_decimals = false;
					break;
				default:
					formatted += p_format.chr(c);
			}
		}
	}

	if (in_format) {
		return "incomplete format";
	}

	if (value_index != values.size()) {
		return "not all arguments converted during string formatting";
	}

	if (error) {
		*error = false;
	}
	return formatted;
}

Array::Array(const Array &p_from) {
	_p = nullptr;
	_ref(p_from);
}

Array::Array() {
	_p = memnew(ArrayPrivate);
	_p->refcount.init();
}
Array::~Array() {
	_unref();
}