/*
   * 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 <string.h>
  #include <assert.h>
  
  #include "py/objtuple.h"
  #include "py/runtime.h"
  
  /******************************************************************************/
  /* tuple                                                                      */
  
  void mp_obj_tuple_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
      mp_obj_tuple_t *o = MP_OBJ_TO_PTR(o_in);
      if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
          mp_print_str(print, "[");
      } else {
          mp_print_str(print, "(");
          kind = PRINT_REPR;
      }
      for (size_t i = 0; i < o->len; i++) {
          if (i > 0) {
              mp_print_str(print, ", ");
          }
          mp_obj_print_helper(print, o->items[i], kind);
      }
      if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
          mp_print_str(print, "]");
      } else {
          if (o->len == 1) {
              mp_print_str(print, ",");
          }
          mp_print_str(print, ")");
      }
  }
  
  STATIC mp_obj_t mp_obj_tuple_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
      (void)type_in;
  
      mp_arg_check_num(n_args, n_kw, 0, 1, false);
  
      switch (n_args) {
          case 0:
              // return a empty tuple
              return mp_const_empty_tuple;
  
          case 1:
          default: {
              // 1 argument, an iterable from which we make a new tuple
              if (MP_OBJ_IS_TYPE(args[0], &mp_type_tuple)) {
                  return args[0];
              }
  
              // TODO optimise for cases where we know the length of the iterator
  
              size_t alloc = 4;
              size_t len = 0;
              mp_obj_t *items = m_new(mp_obj_t, alloc);
  
              mp_obj_t iterable = mp_getiter(args[0], NULL);
              mp_obj_t item;
              while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
                  if (len >= alloc) {
                      items = m_renew(mp_obj_t, items, alloc, alloc * 2);
                      alloc *= 2;
                  }
                  items[len++] = item;
              }
  
              mp_obj_t tuple = mp_obj_new_tuple(len, items);
              m_del(mp_obj_t, items, alloc);
  
              return tuple;
          }
      }
  }
  
  // Don't pass MP_BINARY_OP_NOT_EQUAL here
  STATIC mp_obj_t tuple_cmp_helper(mp_uint_t op, mp_obj_t self_in, mp_obj_t another_in) {
      // type check is done on getiter method to allow tuple, namedtuple, attrtuple
      mp_check_self(mp_obj_get_type(self_in)->getiter == mp_obj_tuple_getiter);
      mp_obj_type_t *another_type = mp_obj_get_type(another_in);
      mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
      if (another_type->getiter != mp_obj_tuple_getiter) {
          // Slow path for user subclasses
          another_in = mp_instance_cast_to_native_base(another_in, MP_OBJ_FROM_PTR(&mp_type_tuple));
          if (another_in == MP_OBJ_NULL) {
              if (op == MP_BINARY_OP_EQUAL) {
                  return mp_const_false;
              }
              return MP_OBJ_NULL;
          }
      }
      mp_obj_tuple_t *another = MP_OBJ_TO_PTR(another_in);
  
      return mp_obj_new_bool(mp_seq_cmp_objs(op, self->items, self->len, another->items, another->len));
  }
  
  mp_obj_t mp_obj_tuple_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
      mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
      switch (op) {
          case MP_UNARY_OP_BOOL: return mp_obj_new_bool(self->len != 0);
          case MP_UNARY_OP_HASH: {
              // start hash with pointer to empty tuple, to make it fairly unique
              mp_int_t hash = (mp_int_t)mp_const_empty_tuple;
              for (size_t i = 0; i < self->len; i++) {
                  hash += MP_OBJ_SMALL_INT_VALUE(mp_unary_op(MP_UNARY_OP_HASH, self->items[i]));
              }
              return MP_OBJ_NEW_SMALL_INT(hash);
          }
          case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->len);
          default: return MP_OBJ_NULL; // op not supported
      }
  }
  
  mp_obj_t mp_obj_tuple_binary_op(mp_binary_op_t op, mp_obj_t lhs, mp_obj_t rhs) {
      mp_obj_tuple_t *o = MP_OBJ_TO_PTR(lhs);
      switch (op) {
          case MP_BINARY_OP_ADD:
          case MP_BINARY_OP_INPLACE_ADD: {
              if (!mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(rhs)), MP_OBJ_FROM_PTR(&mp_type_tuple))) {
                  return MP_OBJ_NULL; // op not supported
              }
              mp_obj_tuple_t *p = MP_OBJ_TO_PTR(rhs);
              mp_obj_tuple_t *s = MP_OBJ_TO_PTR(mp_obj_new_tuple(o->len + p->len, NULL));
              mp_seq_cat(s->items, o->items, o->len, p->items, p->len, mp_obj_t);
              return MP_OBJ_FROM_PTR(s);
          }
          case MP_BINARY_OP_MULTIPLY:
          case MP_BINARY_OP_INPLACE_MULTIPLY: {
              mp_int_t n;
              if (!mp_obj_get_int_maybe(rhs, &n)) {
                  return MP_OBJ_NULL; // op not supported
              }
              if (n <= 0) {
                  return mp_const_empty_tuple;
              }
              mp_obj_tuple_t *s = MP_OBJ_TO_PTR(mp_obj_new_tuple(o->len * n, NULL));
              mp_seq_multiply(o->items, sizeof(*o->items), o->len, n, s->items);
              return MP_OBJ_FROM_PTR(s);
          }
          case MP_BINARY_OP_EQUAL:
          case MP_BINARY_OP_LESS:
          case MP_BINARY_OP_LESS_EQUAL:
          case MP_BINARY_OP_MORE:
          case MP_BINARY_OP_MORE_EQUAL:
              return tuple_cmp_helper(op, lhs, rhs);
  
          default:
              return MP_OBJ_NULL; // op not supported
      }
  }
  
  mp_obj_t mp_obj_tuple_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
      if (value == MP_OBJ_SENTINEL) {
          // load
          mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
  #if MICROPY_PY_BUILTINS_SLICE
          if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
              mp_bound_slice_t slice;
              if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
                  mp_raise_NotImplementedError("only slices with step=1 (aka None) are supported");
              }
              mp_obj_tuple_t *res = MP_OBJ_TO_PTR(mp_obj_new_tuple(slice.stop - slice.start, NULL));
              mp_seq_copy(res->items, self->items + slice.start, res->len, mp_obj_t);
              return MP_OBJ_FROM_PTR(res);
          }
  #endif
          size_t index_value = mp_get_index(self->base.type, self->len, index, false);
          return self->items[index_value];
      } else {
          return MP_OBJ_NULL; // op not supported
      }
  }
  
  STATIC mp_obj_t tuple_count(mp_obj_t self_in, mp_obj_t value) {
      mp_check_self(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
      mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
      return mp_seq_count_obj(self->items, self->len, value);
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_2(tuple_count_obj, tuple_count);
  
  STATIC mp_obj_t tuple_index(size_t n_args, const mp_obj_t *args) {
      mp_check_self(MP_OBJ_IS_TYPE(args[0], &mp_type_tuple));
      mp_obj_tuple_t *self = MP_OBJ_TO_PTR(args[0]);
      return mp_seq_index_obj(self->items, self->len, n_args, args);
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(tuple_index_obj, 2, 4, tuple_index);
  
  STATIC const mp_rom_map_elem_t tuple_locals_dict_table[] = {
      { MP_ROM_QSTR(MP_QSTR_count), MP_ROM_PTR(&tuple_count_obj) },
      { MP_ROM_QSTR(MP_QSTR_index), MP_ROM_PTR(&tuple_index_obj) },
  };
  
  STATIC MP_DEFINE_CONST_DICT(tuple_locals_dict, tuple_locals_dict_table);
  
  const mp_obj_type_t mp_type_tuple = {
      { &mp_type_type },
      .name = MP_QSTR_tuple,
      .print = mp_obj_tuple_print,
      .make_new = mp_obj_tuple_make_new,
      .unary_op = mp_obj_tuple_unary_op,
      .binary_op = mp_obj_tuple_binary_op,
      .subscr = mp_obj_tuple_subscr,
      .getiter = mp_obj_tuple_getiter,
      .locals_dict = (mp_obj_dict_t*)&tuple_locals_dict,
  };
  
  // the zero-length tuple
  const mp_obj_tuple_t mp_const_empty_tuple_obj = {{&mp_type_tuple}, 0};
  
  mp_obj_t mp_obj_new_tuple(size_t n, const mp_obj_t *items) {
      if (n == 0) {
          return mp_const_empty_tuple;
      }
      mp_obj_tuple_t *o = m_new_obj_var(mp_obj_tuple_t, mp_obj_t, n);
      o->base.type = &mp_type_tuple;
      o->len = n;
      if (items) {
          for (size_t i = 0; i < n; i++) {
              o->items[i] = items[i];
          }
      }
      return MP_OBJ_FROM_PTR(o);
  }
  
  void mp_obj_tuple_get(mp_obj_t self_in, size_t *len, mp_obj_t **items) {
      assert(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
      mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
      *len = self->len;
      *items = &self->items[0];
  }
  
  void mp_obj_tuple_del(mp_obj_t self_in) {
      assert(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
      mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
      m_del_var(mp_obj_tuple_t, mp_obj_t, self->len, self);
  }
  
  /******************************************************************************/
  /* tuple iterator                                                             */
  
  typedef struct _mp_obj_tuple_it_t {
      mp_obj_base_t base;
      mp_fun_1_t iternext;
      mp_obj_tuple_t *tuple;
      size_t cur;
  } mp_obj_tuple_it_t;
  
  STATIC mp_obj_t tuple_it_iternext(mp_obj_t self_in) {
      mp_obj_tuple_it_t *self = MP_OBJ_TO_PTR(self_in);
      if (self->cur < self->tuple->len) {
          mp_obj_t o_out = self->tuple->items[self->cur];
          self->cur += 1;
          return o_out;
      } else {
          return MP_OBJ_STOP_ITERATION;
      }
  }
  
  mp_obj_t mp_obj_tuple_getiter(mp_obj_t o_in, mp_obj_iter_buf_t *iter_buf) {
      assert(sizeof(mp_obj_tuple_it_t) <= sizeof(mp_obj_iter_buf_t));
      mp_obj_tuple_it_t *o = (mp_obj_tuple_it_t*)iter_buf;
      o->base.type = &mp_type_polymorph_iter;
      o->iternext = tuple_it_iternext;
      o->tuple = MP_OBJ_TO_PTR(o_in);
      o->cur = 0;
      return MP_OBJ_FROM_PTR(o);
  }