# Copyright 2021 AlQuraishi Laboratory
#
# 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.

import pickle
import torch
import torch.nn as nn
import numpy as np
import unittest
from openfold.config import model_config
from openfold.model.model import AlphaFold
import openfold.utils.feats as feats
from openfold.utils.tensor_utils import tree_map, tensor_tree_map
import tests.compare_utils as compare_utils
from tests.config import consts
from tests.data_utils import (
    random_template_feats,
    random_extra_msa_feats,
)

if(compare_utils.alphafold_is_installed()):
    alphafold = compare_utils.import_alphafold()
    import jax
    import haiku as hk


class TestModel(unittest.TestCase):
    def test_dry_run(self):
        batch_size = consts.batch_size
        n_seq = consts.n_seq
        n_templ = consts.n_templ
        n_res = consts.n_res
        n_extra_seq = consts.n_extra

        c = model_config("model_1").model
        c.no_cycles = 2  
        c.evoformer_stack.no_blocks = 4 # no need to go overboard here
        c.evoformer_stack.blocks_per_ckpt = None # don't want to set up 
                                                 # deepspeed for this test

        model = AlphaFold(c)

        batch = {}
        tf = torch.randint(
            c.input_embedder.tf_dim - 1, size=(batch_size, n_res)
        )
        batch["target_feat"] = nn.functional.one_hot(
            tf, c.input_embedder.tf_dim).float()
        batch["aatype"] = torch.argmax(batch["target_feat"], dim=-1)
        batch["residue_index"] = torch.arange(n_res)
        batch["msa_feat"] = torch.rand(
            (batch_size, n_seq, n_res, c.input_embedder.msa_dim)
        )
        t_feats = random_template_feats(n_templ, n_res, batch_size=batch_size)
        batch.update({k:torch.tensor(v) for k, v in t_feats.items()})
        extra_feats = random_extra_msa_feats(
            n_extra_seq, n_res, batch_size=batch_size
        )
        batch.update({k:torch.tensor(v) for k, v in extra_feats.items()}) 
        batch["msa_mask"] = torch.randint(
            low=0, high=2, size=(batch_size, n_seq, n_res)
        ).float()
        batch["seq_mask"] = torch.randint(
            low=0, high=2, size=(batch_size, n_res)
        ).float()
        batch.update(feats.compute_residx(batch))

        add_recycling_dims = lambda t: (
            t.unsqueeze(-1).expand(*t.shape, c.no_cycles)
        )
        batch = tensor_tree_map(add_recycling_dims, batch)

        with torch.no_grad(): 
            out = model(batch)

    @compare_utils.skip_unless_alphafold_installed()
    def test_compare(self):
        def run_alphafold(batch):
            config = compare_utils.get_alphafold_config()
            model = alphafold.model.modules.AlphaFold(config.model)
            return model(
                batch=batch, is_training=False, return_representations=True,
            )

        f = hk.transform(run_alphafold)

        params = compare_utils.fetch_alphafold_module_weights('') 

        with open("tests/test_data/sample_feats.pickle", "rb") as fp:
            batch = pickle.load(fp)

        out_gt = jax.jit(f.apply)(params, jax.random.PRNGKey(42), batch)

        out_gt = out_gt["structure_module"]["final_atom_positions"]
        # atom37_to_atom14 doesn't like batches
        batch["residx_atom14_to_atom37"] = batch["residx_atom14_to_atom37"][0]
        batch["atom14_atom_exists"] = batch["atom14_atom_exists"][0]
        out_gt = alphafold.model.all_atom.atom37_to_atom14(out_gt, batch)
        out_gt = torch.as_tensor(np.array(out_gt.block_until_ready()))
 
        batch = {
            k:torch.as_tensor(v).cuda() for k,v in batch.items()
        }
        batch["aatype"] = batch["aatype"].long()
        batch["template_aatype"] = batch["template_aatype"].long()
        batch["extra_msa"] = batch["extra_msa"].long()
        batch["residx_atom37_to_atom14"] = batch["residx_atom37_to_atom14"].long()

        # Move the recycling dimension to the end
        move_dim = lambda t: t.permute(*range(len(t.shape))[1:], 0)
        batch = tensor_tree_map(move_dim, batch)

        with torch.no_grad():
            model = compare_utils.get_global_pretrained_openfold()
            out_repro = model(batch)

        out_repro = tensor_tree_map(lambda t: t.cpu(), out_repro)

        out_repro = out_repro["sm"]["positions"][-1]
        out_repro = out_repro.squeeze(0)

        self.assertTrue(torch.max(torch.abs(out_gt - out_repro) < 1e-3))

