/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>

#include "py/obj.h"
#include "py/objtype.h"
#include "py/objint.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "py/stackctrl.h"
#include "py/stream.h" // for mp_obj_print

const mp_obj_type_t *mp_obj_get_type(mp_const_obj_t o_in) {
 #if MICROPY_OBJ_IMMEDIATE_OBJS && MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_A

 if (mp_obj_is_obj(o_in)) {
 const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
 return o->type;
 } else {
 static const mp_obj_type_t *const types[] = {
 NULL, &mp_type_int, &mp_type_str, &mp_type_int,
 NULL, &mp_type_int, &mp_type_NoneType, &mp_type_int,
 NULL, &mp_type_int, &mp_type_str, &mp_type_int,
 NULL, &mp_type_int, &mp_type_bool, &mp_type_int,
 };
 return types[(uintptr_t)o_in & 0xf];
 }

 #elif MICROPY_OBJ_IMMEDIATE_OBJS && MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C

 if (mp_obj_is_small_int(o_in)) {
 return &mp_type_int;
 } else if (mp_obj_is_obj(o_in)) {
 const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
 return o->type;
 #if MICROPY_PY_BUILTINS_FLOAT
 } else if ((((mp_uint_t)(o_in)) & 0xff800007) != 0x00000006) {
 return &mp_type_float;
 #endif
 } else {
 static const mp_obj_type_t *const types[] = {
 &mp_type_str, &mp_type_NoneType, &mp_type_str, &mp_type_bool,
 };
 return types[((uintptr_t)o_in >> 3) & 3];
 }

 #else

 if (mp_obj_is_small_int(o_in)) {
 return &mp_type_int;
 } else if (mp_obj_is_qstr(o_in)) {
 return &mp_type_str;
 #if MICROPY_PY_BUILTINS_FLOAT && ( \
 MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C || MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_D)
 } else if (mp_obj_is_float(o_in)) {
 return &mp_type_float;
 #endif
 #if MICROPY_OBJ_IMMEDIATE_OBJS
 } else if (mp_obj_is_immediate_obj(o_in)) {
 static const mp_obj_type_t *const types[2] = {&mp_type_NoneType, &mp_type_bool};
 return types[MP_OBJ_IMMEDIATE_OBJ_VALUE(o_in) & 1];
 #endif
 } else {
 const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
 return o->type;
 }

 #endif
}

const char *mp_obj_get_type_str(mp_const_obj_t o_in) {
 return qstr_str(mp_obj_get_type(o_in)->name);
}

void mp_obj_print_helper(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
 // There can be data structures nested too deep, or just recursive
 MP_STACK_CHECK();
 #ifndef NDEBUG
 if (o_in == MP_OBJ_NULL) {
 mp_print_str(print, "(nil)");
 return;
 }
 #endif
 const mp_obj_type_t *type = mp_obj_get_type(o_in);
 if (type->print != NULL) {
 type->print((mp_print_t *)print, o_in, kind);
 } else {
 mp_printf(print, "<%q>", type->name);
 }
}

void mp_obj_print(mp_obj_t o_in, mp_print_kind_t kind) {
 mp_obj_print_helper(MP_PYTHON_PRINTER, o_in, kind);
}

// helper function to print an exception with traceback
void mp_obj_print_exception(const mp_print_t *print, mp_obj_t exc) {
 if (mp_obj_is_exception_instance(exc)) {
 size_t n, *values;
 mp_obj_exception_get_traceback(exc, &n, &values);
 if (n > 0) {
 assert(n % 3 == 0);
 mp_print_str(print, "Traceback (most recent call last):\n");
 for (int i = n - 3; i >= 0; i -= 3) {
 #if MICROPY_ENABLE_SOURCE_LINE
 mp_printf(print, " File \"%q\", line %d", values[i], (int)values[i + 1]);
 #else
 mp_printf(print, " File \"%q\"", values[i]);
 #endif
 // the block name can be NULL if it's unknown
 qstr block = values[i + 2];
 if (block == MP_QSTRnull) {
 mp_print_str(print, "\n");
 } else {
 mp_printf(print, ", in %q\n", block);
 }
 }
 }
 }
 mp_obj_print_helper(print, exc, PRINT_EXC);
 mp_print_str(print, "\n");
}

bool mp_obj_is_true(mp_obj_t arg) {
 if (arg == mp_const_false) {
 return 0;
 } else if (arg == mp_const_true) {
 return 1;
 } else if (arg == mp_const_none) {
 return 0;
 } else if (mp_obj_is_small_int(arg)) {
 if (arg == MP_OBJ_NEW_SMALL_INT(0)) {
 return 0;
 } else {
 return 1;
 }
 } else {
 const mp_obj_type_t *type = mp_obj_get_type(arg);
 if (type->unary_op != NULL) {
 mp_obj_t result = type->unary_op(MP_UNARY_OP_BOOL, arg);
 if (result != MP_OBJ_NULL) {
 return result == mp_const_true;
 }
 }

 mp_obj_t len = mp_obj_len_maybe(arg);
 if (len != MP_OBJ_NULL) {
 // obj has a length, truth determined if len != 0
 return len != MP_OBJ_NEW_SMALL_INT(0);
 } else {
 // any other obj is true per Python semantics
 return 1;
 }
 }
}

bool mp_obj_is_callable(mp_obj_t o_in) {
 const mp_call_fun_t call = mp_obj_get_type(o_in)->call;
 if (call != mp_obj_instance_call) {
 return call != NULL;
 }
 return mp_obj_instance_is_callable(o_in);
}

// This function implements the '==' and '!=' operators.
//
// From the Python language reference:
// (https://docs.python.org/3/reference/expressions.html#not-in)
// "The objects need not have the same type. If both are numbers, they are converted
// to a common type. Otherwise, the == and != operators always consider objects of
// different types to be unequal."
//
// This means that False==0 and True==1 are true expressions.
//
// Furthermore, from the v3.4.2 code for object.c: "Practical amendments: If rich
// comparison returns NotImplemented, == and != are decided by comparing the object
// pointer."
mp_obj_t mp_obj_equal_not_equal(mp_binary_op_t op, mp_obj_t o1, mp_obj_t o2) {
 mp_obj_t local_true = (op == MP_BINARY_OP_NOT_EQUAL) ? mp_const_false : mp_const_true;
 mp_obj_t local_false = (op == MP_BINARY_OP_NOT_EQUAL) ? mp_const_true : mp_const_false;
 int pass_number = 0;

 // Shortcut for very common cases
 if (o1 == o2 &&
 (mp_obj_is_small_int(o1) || !(mp_obj_get_type(o1)->flags & MP_TYPE_FLAG_EQ_NOT_REFLEXIVE))) {
 return local_true;
 }

 // fast path for strings
 if (mp_obj_is_str(o1)) {
 if (mp_obj_is_str(o2)) {
 // both strings, use special function
 return mp_obj_str_equal(o1, o2) ? local_true : local_false;
 #if MICROPY_PY_STR_BYTES_CMP_WARN
 } else if (mp_obj_is_type(o2, &mp_type_bytes)) {
 str_bytes_cmp:
 mp_warning(MP_WARN_CAT(BytesWarning), "Comparison between bytes and str");
 return local_false;
 #endif
 } else {
 goto skip_one_pass;
 }
 #if MICROPY_PY_STR_BYTES_CMP_WARN
 } else if (mp_obj_is_str(o2) && mp_obj_is_type(o1, &mp_type_bytes)) {
 // o1 is not a string (else caught above), so the objects are not equal
 goto str_bytes_cmp;
 #endif
 }

 // fast path for small ints
 if (mp_obj_is_small_int(o1)) {
 if (mp_obj_is_small_int(o2)) {
 // both SMALL_INT, and not equal if we get here
 return local_false;
 } else {
 goto skip_one_pass;
 }
 }

 // generic type, call binary_op(MP_BINARY_OP_EQUAL)
 while (pass_number < 2) {
 const mp_obj_type_t *type = mp_obj_get_type(o1);
 // If a full equality test is not needed and the other object is a different
 // type then we don't need to bother trying the comparison.
 if (type->binary_op != NULL &&
 ((type->flags & MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE) || mp_obj_get_type(o2) == type)) {
 // CPython is asymmetric: it will try __eq__ if there's no __ne__ but not the
 // other way around. If the class doesn't need a full test we can skip __ne__.
 if (op == MP_BINARY_OP_NOT_EQUAL && (type->flags & MP_TYPE_FLAG_EQ_HAS_NEQ_TEST)) {
 mp_obj_t r = type->binary_op(MP_BINARY_OP_NOT_EQUAL, o1, o2);
 if (r != MP_OBJ_NULL) {
 return r;
 }
 }

 // Try calling __eq__.
 mp_obj_t r = type->binary_op(MP_BINARY_OP_EQUAL, o1, o2);
 if (r != MP_OBJ_NULL) {
 if (op == MP_BINARY_OP_EQUAL) {
 return r;
 } else {
 return mp_obj_is_true(r) ? local_true : local_false;
 }
 }
 }

 skip_one_pass:
 // Try the other way around if none of the above worked
 ++pass_number;
 mp_obj_t temp = o1;
 o1 = o2;
 o2 = temp;
 }

 // equality not implemented, so fall back to pointer conparison
 return (o1 == o2) ? local_true : local_false;
}

bool mp_obj_equal(mp_obj_t o1, mp_obj_t o2) {
 return mp_obj_is_true(mp_obj_equal_not_equal(MP_BINARY_OP_EQUAL, o1, o2));
}

mp_int_t mp_obj_get_int(mp_const_obj_t arg) {
 // This function essentially performs implicit type conversion to int
 // Note that Python does NOT provide implicit type conversion from
 // float to int in the core expression language, try some_list[1.0].
 if (arg == mp_const_false) {
 return 0;
 } else if (arg == mp_const_true) {
 return 1;
 } else if (mp_obj_is_small_int(arg)) {
 return MP_OBJ_SMALL_INT_VALUE(arg);
 } else if (mp_obj_is_type(arg, &mp_type_int)) {
 return mp_obj_int_get_checked(arg);
 } else {
 mp_obj_t res = mp_unary_op(MP_UNARY_OP_INT, (mp_obj_t)arg);
 return mp_obj_int_get_checked(res);
 }
}

mp_int_t mp_obj_get_int_truncated(mp_const_obj_t arg) {
 if (mp_obj_is_int(arg)) {
 return mp_obj_int_get_truncated(arg);
 } else {
 return mp_obj_get_int(arg);
 }
}

// returns false if arg is not of integral type
// returns true and sets *value if it is of integral type
// can throw OverflowError if arg is of integral type, but doesn't fit in a mp_int_t
bool mp_obj_get_int_maybe(mp_const_obj_t arg, mp_int_t *value) {
 if (arg == mp_const_false) {
 *value = 0;
 } else if (arg == mp_const_true) {
 *value = 1;
 } else if (mp_obj_is_small_int(arg)) {
 *value = MP_OBJ_SMALL_INT_VALUE(arg);
 } else if (mp_obj_is_type(arg, &mp_type_int)) {
 *value = mp_obj_int_get_checked(arg);
 } else {
 return false;
 }
 return true;
}

#if MICROPY_PY_BUILTINS_FLOAT
bool mp_obj_get_float_maybe(mp_obj_t arg, mp_float_t *value) {
 mp_float_t val;

 if (arg == mp_const_false) {
 val = 0;
 } else if (arg == mp_const_true) {
 val = 1;
 } else if (mp_obj_is_small_int(arg)) {
 val = (mp_float_t)MP_OBJ_SMALL_INT_VALUE(arg);
 #if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
 } else if (mp_obj_is_type(arg, &mp_type_int)) {
 val = mp_obj_int_as_float_impl(arg);
 #endif
 } else if (mp_obj_is_float(arg)) {
 val = mp_obj_float_get(arg);
 } else {
 return false;
 }

 *value = val;
 return true;
}

mp_float_t mp_obj_get_float(mp_obj_t arg) {
 mp_float_t val;

 if (!mp_obj_get_float_maybe(arg, &val)) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("can't convert to float"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("can't convert %s to float"), mp_obj_get_type_str(arg));
 #endif
 }

 return val;
}

#if MICROPY_PY_BUILTINS_COMPLEX
bool mp_obj_get_complex_maybe(mp_obj_t arg, mp_float_t *real, mp_float_t *imag) {
 if (arg == mp_const_false) {
 *real = 0;
 *imag = 0;
 } else if (arg == mp_const_true) {
 *real = 1;
 *imag = 0;
 } else if (mp_obj_is_small_int(arg)) {
 *real = (mp_float_t)MP_OBJ_SMALL_INT_VALUE(arg);
 *imag = 0;
 #if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
 } else if (mp_obj_is_type(arg, &mp_type_int)) {
 *real = mp_obj_int_as_float_impl(arg);
 *imag = 0;
 #endif
 } else if (mp_obj_is_float(arg)) {
 *real = mp_obj_float_get(arg);
 *imag = 0;
 } else if (mp_obj_is_type(arg, &mp_type_complex)) {
 mp_obj_complex_get(arg, real, imag);
 } else {
 return false;
 }
 return true;
}

void mp_obj_get_complex(mp_obj_t arg, mp_float_t *real, mp_float_t *imag) {
 if (!mp_obj_get_complex_maybe(arg, real, imag)) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("can't convert to complex"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("can't convert %s to complex"), mp_obj_get_type_str(arg));
 #endif
 }
}
#endif
#endif

// note: returned value in *items may point to the interior of a GC block
void mp_obj_get_array(mp_obj_t o, size_t *len, mp_obj_t **items) {
 if (mp_obj_is_type(o, &mp_type_tuple)) {
 mp_obj_tuple_get(o, len, items);
 } else if (mp_obj_is_type(o, &mp_type_list)) {
 mp_obj_list_get(o, len, items);
 } else {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("expected tuple/list"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("object '%s' isn't a tuple or list"), mp_obj_get_type_str(o));
 #endif
 }
}

// note: returned value in *items may point to the interior of a GC block
void mp_obj_get_array_fixed_n(mp_obj_t o, size_t len, mp_obj_t **items) {
 size_t seq_len;
 mp_obj_get_array(o, &seq_len, items);
 if (seq_len != len) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_ValueError(MP_ERROR_TEXT("tuple/list has wrong length"));
 #else
 mp_raise_msg_varg(&mp_type_ValueError,
 MP_ERROR_TEXT("requested length %d but object has length %d"), (int)len, (int)seq_len);
 #endif
 }
}

// is_slice determines whether the index is a slice index
size_t mp_get_index(const mp_obj_type_t *type, size_t len, mp_obj_t index, bool is_slice) {
 mp_int_t i;
 if (mp_obj_is_small_int(index)) {
 i = MP_OBJ_SMALL_INT_VALUE(index);
 } else if (!mp_obj_get_int_maybe(index, &i)) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("indices must be integers"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("%q indices must be integers, not %s"),
 type->name, mp_obj_get_type_str(index));
 #endif
 }

 if (i < 0) {
 i += len;
 }
 if (is_slice) {
 if (i < 0) {
 i = 0;
 } else if ((mp_uint_t)i > len) {
 i = len;
 }
 } else {
 if (i < 0 || (mp_uint_t)i >= len) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_msg(&mp_type_IndexError, MP_ERROR_TEXT("index out of range"));
 #else
 mp_raise_msg_varg(&mp_type_IndexError, MP_ERROR_TEXT("%q index out of range"), type->name);
 #endif
 }
 }

 // By this point 0 <= i <= len and so fits in a size_t
 return (size_t)i;
}

mp_obj_t mp_obj_id(mp_obj_t o_in) {
 mp_int_t id = (mp_int_t)o_in;
 if (!mp_obj_is_obj(o_in)) {
 return mp_obj_new_int(id);
 } else if (id >= 0) {
 // Many OSes and CPUs have affinity for putting "user" memories
 // into low half of address space, and "system" into upper half.
 // We're going to take advantage of that and return small int
 // (signed) for such "user" addresses.
 return MP_OBJ_NEW_SMALL_INT(id);
 } else {
 // If that didn't work, well, let's return long int, just as
 // a (big) positive value, so it will never clash with the range
 // of small int returned in previous case.
 return mp_obj_new_int_from_uint((mp_uint_t)id);
 }
}

// will raise a TypeError if object has no length
mp_obj_t mp_obj_len(mp_obj_t o_in) {
 mp_obj_t len = mp_obj_len_maybe(o_in);
 if (len == MP_OBJ_NULL) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("object has no len"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("object of type '%s' has no len()"), mp_obj_get_type_str(o_in));
 #endif
 } else {
 return len;
 }
}

// may return MP_OBJ_NULL
mp_obj_t mp_obj_len_maybe(mp_obj_t o_in) {
 if (
 #if !MICROPY_PY_BUILTINS_STR_UNICODE
 // It's simple - unicode is slow, non-unicode is fast
 mp_obj_is_str(o_in) ||
 #endif
 mp_obj_is_type(o_in, &mp_type_bytes)) {
 GET_STR_LEN(o_in, l);
 return MP_OBJ_NEW_SMALL_INT(l);
 } else {
 const mp_obj_type_t *type = mp_obj_get_type(o_in);
 if (type->unary_op != NULL) {
 return type->unary_op(MP_UNARY_OP_LEN, o_in);
 } else {
 return MP_OBJ_NULL;
 }
 }
}

mp_obj_t mp_obj_subscr(mp_obj_t base, mp_obj_t index, mp_obj_t value) {
 const mp_obj_type_t *type = mp_obj_get_type(base);
 if (type->subscr != NULL) {
 mp_obj_t ret = type->subscr(base, index, value);
 if (ret != MP_OBJ_NULL) {
 return ret;
 }
 // TODO: call base classes here?
 }
 if (value == MP_OBJ_NULL) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("object doesn't support item deletion"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("'%s' object doesn't support item deletion"), mp_obj_get_type_str(base));
 #endif
 } else if (value == MP_OBJ_SENTINEL) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("object isn't subscriptable"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("'%s' object isn't subscriptable"), mp_obj_get_type_str(base));
 #endif
 } else {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_raise_TypeError(MP_ERROR_TEXT("object doesn't support item assignment"));
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("'%s' object doesn't support item assignment"), mp_obj_get_type_str(base));
 #endif
 }
}

// Return input argument. Useful as .getiter for objects which are
// their own iterators, etc.
mp_obj_t mp_identity(mp_obj_t self) {
 return self;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_identity_obj, mp_identity);

mp_obj_t mp_identity_getiter(mp_obj_t self, mp_obj_iter_buf_t *iter_buf) {
 (void)iter_buf;
 return self;
}

bool mp_get_buffer(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
 const mp_obj_type_t *type = mp_obj_get_type(obj);
 if (type->buffer_p.get_buffer == NULL) {
 return false;
 }
 int ret = type->buffer_p.get_buffer(obj, bufinfo, flags);
 if (ret != 0) {
 return false;
 }
 return true;
}

void mp_get_buffer_raise(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
 if (!mp_get_buffer(obj, bufinfo, flags)) {
 mp_raise_TypeError(MP_ERROR_TEXT("object with buffer protocol required"));
 }
}

mp_obj_t mp_generic_unary_op(mp_unary_op_t op, mp_obj_t o_in) {
 switch (op) {
 case MP_UNARY_OP_HASH:
 return MP_OBJ_NEW_SMALL_INT((mp_uint_t)o_in);
 default:
 return MP_OBJ_NULL; // op not supported
 }
}