# coding=utf-8
# Copyright (c) 2020, NVIDIA CORPORATION.  All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Input/output checkpointing."""

import os
import random
import sys
import numpy as np

import torch

from megatron.global_vars import codecarbon_tracker_flush
from megatron import (get_args,
                      mpu,
                      print_rank_0,
                      update_num_microbatches,
                      utils,
                      get_tokenizer)
from megatron.enums import PositionEmbeddingType

_CHECKPOINT_VERSION = None

def set_checkpoint_version(value):
    global _CHECKPOINT_VERSION
    if _CHECKPOINT_VERSION is not None:
        assert _CHECKPOINT_VERSION == value, \
            "checkpoint versions do not match"
    _CHECKPOINT_VERSION = value

def get_checkpoint_version():
    global _CHECKPOINT_VERSION
    return _CHECKPOINT_VERSION

def check_checkpoint_args(checkpoint_args):
    """Ensure fixed arguments for a model are the same for the input
    arguments and the one retrieved from checkpoint."""
    args = get_args()

    def _compare(arg_name, old_arg_name=None):
        if old_arg_name is not None:
            checkpoint_value = getattr(checkpoint_args, old_arg_name)
        else:
            checkpoint_value = getattr(checkpoint_args, arg_name)
        args_value = getattr(args, arg_name)
        error_message = '{} value from checkpoint ({}) is not equal to the ' \
                        'input argument value ({}).'.format(
                            arg_name, checkpoint_value, args_value)
        assert checkpoint_value == args_value, error_message

    _compare('num_layers')
    _compare('hidden_size')
    _compare('num_attention_heads')
    _compare('position_embedding_type')
    # with alibi we can change `max_position_embeddings`
    if args.position_embedding_type != PositionEmbeddingType.alibi:
        _compare('max_position_embeddings')
    if args.vocab_file:
        _compare('make_vocab_size_divisible_by')
        _compare('padded_vocab_size')
        _compare('tokenizer_type')
    if get_checkpoint_version() < 3.0:
        _compare('tensor_model_parallel_size',
                 old_arg_name='model_parallel_size')
    if get_checkpoint_version() >= 3.0:
        _compare('tensor_model_parallel_size')
        _compare('pipeline_model_parallel_size')


def ensure_directory_exists(filename):
    """Build filename's path if it does not already exists."""
    dirname = os.path.dirname(filename)
    if not os.path.exists(dirname):
        os.makedirs(dirname)


def get_checkpoint_name(checkpoints_path, iteration,
                        release=False):
    """A unified checkpoint name."""
    if release:
        directory = 'release'
    else:
        directory = 'iter_{:07d}'.format(iteration)
    # Use both the tensor and pipeline MP rank.
    if mpu.get_pipeline_model_parallel_world_size() == 1:
        return os.path.join(checkpoints_path, directory,
                            'mp_rank_{:02d}'.format(
                                mpu.get_tensor_model_parallel_rank()),
                            'model_optim_rng.pt')
    return os.path.join(checkpoints_path, directory,
                        'mp_rank_{:02d}_{:03d}'.format(
                            mpu.get_tensor_model_parallel_rank(),
                            mpu.get_pipeline_model_parallel_rank()),
                        'model_optim_rng.pt')


def get_checkpoint_tracker_filename(checkpoints_path):
    """Tracker file rescords the latest chckpoint during
    training to restart from."""
    return os.path.join(checkpoints_path, 'latest_checkpointed_iteration.txt')


def save_checkpoint(iteration, model, optimizer, lr_scheduler):
    """Save a model checkpoint."""
    args = get_args()

    # Only rank zero of the data parallel writes to the disk.
    if not args.deepspeed:
        model = utils.unwrap_model(model)

    print_rank_0('saving checkpoint at iteration {:7d} to {}'.format(
        iteration, args.save))

    if not torch.distributed.is_initialized() or mpu.get_data_parallel_rank() == 0 \
        or args.deepspeed:

        # Arguments, iteration, and model.
        state_dict = {}
        state_dict['args'] = args
        state_dict['checkpoint_version'] = 3.0
        state_dict['iteration'] = iteration
        state_dict['tokens'] = args.consumed_train_tokens
        state_dict['checkpoint_info'] = _checkpoint_info()

        # DeepSpeed saves the model/optimizer/scheduler
        if not args.deepspeed:
            if len(model) == 1:
                state_dict['model'] = model[0].state_dict_for_save_checkpoint()
            else:
                for i in range(len(model)):
                    mpu.set_virtual_pipeline_model_parallel_rank(i)
                    state_dict['model%d' % i] = model[i].state_dict_for_save_checkpoint()

            # Optimizer stuff.
            if not args.no_save_optim:
                if optimizer is not None:
                    state_dict['optimizer'] = optimizer.state_dict()
                if lr_scheduler is not None:
                    state_dict['lr_scheduler'] = lr_scheduler.state_dict()

        # RNG states.
        if not args.no_save_rng:
            state_dict['random_rng_state'] = random.getstate()
            state_dict['np_rng_state'] = np.random.get_state()
            state_dict['torch_rng_state'] = torch.get_rng_state()
            state_dict['cuda_rng_state'] = torch.cuda.get_rng_state()
            state_dict['rng_tracker_states'] \
                = mpu.get_cuda_rng_tracker().get_states()

        # Save.
        checkpoint_name = get_checkpoint_name(args.save, iteration)
        if not args.deepspeed:
            ensure_directory_exists(checkpoint_name)
            torch.save(state_dict, checkpoint_name)

    if args.deepspeed:
        # Saving is a collective communication
        checkpoint_name = get_checkpoint_name(args.save, iteration)
        # Trim off the filename and mp_rank_* directory.
        for _ in range(3):
            checkpoint_name = os.path.dirname(checkpoint_name)
        model[0].save_checkpoint(checkpoint_name, client_state=state_dict)

    # Wait so everyone is done (necessary)
    if torch.distributed.is_initialized():
        torch.distributed.barrier()

    print_rank_0('  successfully saved checkpoint at iteration {:7d} to {}'.format(
        iteration, args.save))

    # And update the latest iteration
    if (not args.deepspeed
        and (not torch.distributed.is_initialized() or torch.distributed.get_rank() == 0)):
        tracker_filename = get_checkpoint_tracker_filename(args.save)
        with open(tracker_filename, 'w') as f:
            f.write(str(iteration))

    # Wait so everyone is done (not necessary)
    if torch.distributed.is_initialized():
        torch.distributed.barrier()

    # since the code can be exited or aborted in various places we use the checkpoint saving as
    # a save saving point for the codecarbon tracker. If the program doesn't run to its normal
    # end, then only the data since the last saved checkpoint will be lost.
    codecarbon_tracker_flush()

def _transpose_first_dim(t, num_splits, num_splits_first, model):
    input_shape = t.size()
    # We use a self_attention module but the values extracted aren't
    # specific to self attention so should work for cross attention as well
    while hasattr(model, 'module'):
        model = model.module
    attention_module = model.language_model.encoder.layers[0].self_attention
    hidden_size_per_attention_head = attention_module.hidden_size_per_attention_head
    num_attention_heads_per_partition = attention_module.num_attention_heads_per_partition
    if num_splits_first:
        """[num_splits * np * hn, h]
        -->(view) [num_splits, np, hn, h]
        -->(tranpose) [np, num_splits, hn, h]
        -->(view) [np * num_splits * hn, h] """

        intermediate_shape = \
            (num_splits, num_attention_heads_per_partition,
             hidden_size_per_attention_head) + input_shape[1:]

        t = t.view(*intermediate_shape)
        t = t.transpose(0, 1).contiguous()
    else:
        """[np * hn * num_splits, h]
        -->(view) [np, hn, num_splits, h]
        -->(tranpose) [np, num_splits, hn, h]
        -->(view) [np * num_splits * hn, h] """

        intermediate_shape = \
            (num_attention_heads_per_partition,
             hidden_size_per_attention_head, num_splits) +\
             input_shape[1:]

        t = t.view(*intermediate_shape)
        t = t.transpose(1, 2).contiguous()
    t = t.view(*input_shape)

    return t

def fix_query_key_value_ordering(model, checkpoint_version):
    """Fix up query/key/value matrix ordering if checkpoint
    version is smaller than 2.0
    """
    if checkpoint_version < 2.0:
        if isinstance(model, list):
            assert len(model)==1
            model = model[0]
        for name, param in model.named_parameters():
            if name.endswith(('.query_key_value.weight', '.query_key_value.bias')):
                if checkpoint_version == 0:
                    fixed_param = _transpose_first_dim(param.data, 3, True, model)
                elif checkpoint_version == 1.0:
                    fixed_param = _transpose_first_dim(param.data, 3, False, model)
                else:
                    print_rank_0(f"Invalid checkpoint version {checkpoint_version}.")
                    sys.exit()
                param.data.copy_(fixed_param)
            if name.endswith(('.key_value.weight', '.key_value.bias')):
                if checkpoint_version == 0:
                    fixed_param = _transpose_first_dim(param.data, 2, True, model)
                elif checkpoint_version == 1.0:
                    fixed_param = _transpose_first_dim(param.data, 2, False, model)
                else:
                    print_rank_0(f"Invalid checkpoint version {checkpoint_version}.")
                    sys.exit()
                param.data.copy_(fixed_param)
        print_rank_0(" succesfully fixed query-key-values ordering for"
                    " checkpoint version {}".format(checkpoint_version))

def load_checkpoint(model, optimizer, lr_scheduler, load_arg='load', strict=True):
    """Load a model checkpoint and return the iteration.
    strict (bool): whether to strictly enforce that the keys in
        :attr:`state_dict` of the checkpoint match the names of
        parameters and buffers in model.
    """
    args = get_args()
    load_dir = getattr(args, load_arg)

    if args.deepspeed:
        load_optimizer_states = False if args.no_load_optim else True
        loaded_dir, state_dict = model[0].load_checkpoint(load_dir, load_optimizer_states=load_optimizer_states)
        if loaded_dir is None:
            print_rank_0('WARNING: could not find the metadata file {} '.format(
                load_dir))
            print_rank_0('    will not load any checkpoints and will start from '
                        'random')
            return 0
        release = False
    else:
        model = utils.unwrap_model(model)

        # Read the tracker file and set the iteration.
        tracker_filename = get_checkpoint_tracker_filename(load_dir)

        # If no tracker file, return iretation zero.
        if not os.path.isfile(tracker_filename):
            print_rank_0('WARNING: could not find the metadata file {} '.format(
                tracker_filename))
            print_rank_0('    will not load any checkpoints and will start from '
                        'random')
            return 0

        # Otherwise, read the tracker file and either set the iteration or
        # mark it as a release checkpoint.
        iteration = 0
        release = False
        with open(tracker_filename, 'r') as f:
            metastring = f.read().strip()
            try:
                iteration = int(metastring)
            except ValueError:
                release = metastring == 'release'
                if not release:
                    print_rank_0('ERROR: Invalid metadata file {}. Exiting'.format(
                        tracker_filename))
                    sys.exit()

        assert iteration > 0 or release, 'error parsing metadata file {}'.format(
            tracker_filename)

        # Checkpoint.
        checkpoint_name = get_checkpoint_name(load_dir, iteration, release)
        print_rank_0(f' loading checkpoint from {args.load} at iteration {iteration}')

        # Load the checkpoint.
        try:
            state_dict = torch.load(checkpoint_name, map_location='cpu')
        except ModuleNotFoundError:
            from megatron.fp16_deprecated import loss_scaler
            # For backward compatibility.
            print_rank_0(' > deserializing using the old code structure ...')
            sys.modules['fp16.loss_scaler'] = sys.modules[
                'megatron.fp16_deprecated.loss_scaler']
            sys.modules['megatron.fp16.loss_scaler'] = sys.modules[
                'megatron.fp16_deprecated.loss_scaler']
            state_dict = torch.load(checkpoint_name, map_location='cpu')
            sys.modules.pop('fp16.loss_scaler', None)
            sys.modules.pop('megatron.fp16.loss_scaler', None)
        except BaseException as e:
            print_rank_0('could not load the checkpoint')
            print_rank_0(e)
            sys.exit()

    # set checkpoint version
    set_checkpoint_version(state_dict.get('checkpoint_version', 0))

    # Set iteration.
    if args.finetune or release:
        iteration = 0
    else:
        try:
            iteration = state_dict['iteration']
            if 'tokens' in state_dict:
                args.consumed_train_tokens = state_dict['tokens']
        except KeyError:
            try:  # Backward compatible with older checkpoints
                iteration = state_dict['total_iters']
            except KeyError:
                print_rank_0('A metadata file exists but unable to load '
                             'iteration from checkpoint {}, exiting'.format(
                                 checkpoint_name))
                sys.exit()

    # Check arguments.
    assert args.consumed_train_samples == 0
    assert args.consumed_valid_samples == 0
    if 'args' in state_dict:
        checkpoint_args = state_dict['args']
        if not args.universal_checkpoint:
            check_checkpoint_args(checkpoint_args)
        args.consumed_train_samples = getattr(checkpoint_args,
                                              'consumed_train_samples', 0)
        update_num_microbatches(consumed_samples=args.consumed_train_samples)
        args.consumed_valid_samples = getattr(checkpoint_args,
                                              'consumed_valid_samples', 0)
        args.gigaflos_no_embeds = getattr(checkpoint_args,
                                          'gigaflos_no_embeds', 0)
    else:
        print_rank_0('could not find arguments in the checkpoint ...')

    # Model.
    if not args.deepspeed:
        if len(model) == 1:
            model[0].load_state_dict(state_dict['model'], strict=strict)
        else:
            for i in range(len(model)):
                mpu.set_virtual_pipeline_model_parallel_rank(i)
                model[i].load_state_dict(state_dict['model%d' % i], strict=strict)

    # Fix up query/key/value matrix ordering if needed
    checkpoint_version = get_checkpoint_version()
    print_rank_0(f' checkpoint version {checkpoint_version}')
    fix_query_key_value_ordering(model, checkpoint_version)

    # Optimizer.
    if not args.deepspeed:
        if not release and not args.finetune and not args.no_load_optim:
            try:
                if optimizer is not None:
                    optimizer.load_state_dict(state_dict['optimizer'])
                if lr_scheduler is not None:
                    lr_scheduler.load_state_dict(state_dict['lr_scheduler'])
            except KeyError:
                print_rank_0('Unable to load optimizer from checkpoint {}. '
                            'Specify --no-load-optim or --finetune to prevent '
                            'attempting to load the optimizer state, '
                            'exiting ...'.format(checkpoint_name))
                sys.exit()

    # rng states.
    if not release and not args.finetune and not args.no_load_rng:
        try:
            random.setstate(state_dict['random_rng_state'])
            np.random.set_state(state_dict['np_rng_state'])
            torch.set_rng_state(state_dict['torch_rng_state'])
            torch.cuda.set_rng_state(state_dict['cuda_rng_state'])
            # Check for empty states array
            if not state_dict['rng_tracker_states']:
                raise KeyError
            mpu.get_cuda_rng_tracker().set_states(
                state_dict['rng_tracker_states'])
        except KeyError:
            print_rank_0('Unable to load rng state from checkpoint {}. '
                         'Specify --no-load-rng or --finetune to prevent '
                         'attempting to load the rng state, '
                         'exiting ...'.format(checkpoint_name))
            sys.exit()

    # Some utilities want to load a checkpoint without distributed being initialized
    if torch.distributed.is_initialized():
        torch.distributed.barrier()

    print_rank_0(f'  successfully loaded checkpoint from {args.load} '
                 f'at iteration {iteration}')

    return iteration


def load_biencoder_checkpoint(model, only_query_model=False,
        only_context_model=False, custom_load_path=None):
    """
    selectively load retrieval models for indexing/retrieving
    from saved checkpoints
    """

    args = get_args()

    model = utils.unwrap_model(model)

    load_path = custom_load_path if custom_load_path is not None else args.load

    tracker_filename = get_checkpoint_tracker_filename(load_path)
    with open(tracker_filename, 'r') as f:
        iteration = int(f.read().strip())

    checkpoint_name = get_checkpoint_name(load_path, iteration, False)
    if mpu.get_data_parallel_rank() == 0:
        print('global rank {} is loading checkpoint {}'.format(
            torch.distributed.get_rank(), checkpoint_name))

    state_dict = torch.load(checkpoint_name, map_location='cpu')
    ret_state_dict = state_dict['model']

    if only_query_model:
        ret_state_dict.pop('context_model')
    if only_context_model:
        ret_state_dict.pop('query_model')

    assert len(model) == 1
    model[0].load_state_dict(ret_state_dict)
    torch.distributed.barrier()

    if mpu.get_data_parallel_rank() == 0:
        print(' successfully loaded {}'.format(checkpoint_name))

    return model


def _checkpoint_info():
    args = get_args()
    # tokenizer = get_tokenizer()

    return {
        "padded_vocab_size": args.padded_vocab_size,
        # "original_vocab_size": tokenizer.vocab_size,
    }
