import os
import ujson as json
import pygit2

from phylogeny import compute_all_P, compute_sim_matrix
from plotting import get_color, UNKNOWN_COLOR, DEFAULT_COLOR
# ------------------------------------------------------------------------------------------------
#
#                                       Loading data
#
# ------------------------------------------------------------------------------------------------
def load_data():
    global UNKNOWN_COLOR, DEFAULT_COLOR, MODEL_SEARCHED_X
    data, model_names,families = load_git()
    if data is None:
        return
    
    #Rename families if needed
    with open('family_table.json','r') as f:
        rename_table = json.load(f)

    for i in range(len(model_names)):
        try:
            families[i] = rename_table[model_names[i]]
        except KeyError:
            pass

    all_P = compute_all_P(data, model_names)
    sim_matrix = compute_sim_matrix(model_names, all_P)

    k = list(all_P.keys())[0]

    unknown_color = UNKNOWN_COLOR

    unique_families = list(set([f for f in families]))
    colors = {}
    idx = 0
    for i, family in enumerate(unique_families):
        color = get_color(idx)
        idx += 1
        while color == unknown_color: # Avoid using the unknown color for a family
            color = get_color(idx)
            idx += 1
        colors[family] = color

    colors['?'] = unknown_color # Assign the unknown color to the unknown family
    
    return data, model_names, families, sim_matrix, colors

def load_git():
    cred = pygit2.UserPass(os.environ['GITHUB_USERNAME'], os.environ['GITHUB_TOKEN'])
    if os.path.exists('Data'):
        repo = pygit2.Repository('Data')
        remote = repo.remotes['origin']  # Use named reference instead of index
        remote.fetch()

        # Get the current branch name
        branch_name = repo.head.shorthand

        # Find the reference to the remote branch
        remote_ref_name = f'refs/remotes/origin/{branch_name}'

        # Merge the changes into the current branch
        remote_commit = repo.lookup_reference(remote_ref_name).target

    else:
        repo = pygit2.clone_repository('https://github.com/PhyloLM/Data', './Data', bare=False, callbacks=GitHubRemoteCallbacks(os.environ['GITHUB_USERNAME'], os.environ['GITHUB_TOKEN']))

    data_array = []
    model_names = []
    families = []
    for foname in os.listdir('Data/math'):
        #check if it is a directory
        if not os.path.isdir(os.path.join('Data/math',foname)):
            continue
        for fname in os.listdir('Data/math/'+foname):
            if not fname.endswith('.json'):
                continue
            with open(os.path.join('Data/math',foname,fname),'r') as f:
                d = json.load(f)
                families.append(d['family'])
                model_names.append(foname+'/'+fname[:-5])
                data_array.append(d['alleles'])

    if data_array == []:
        return None,[],[]
    return data_array,model_names,families

# ------------------------------------------------------------------------------------------------
#
#                                       Git functions
#
# ------------------------------------------------------------------------------------------------

class GitHubRemoteCallbacks(pygit2.RemoteCallbacks):
    def __init__(self, username, token):
        self.username = username
        self.token = token
        super().__init__()
        
    def credentials(self, url, username_from_url, allowed_types):
        return pygit2.UserPass(self.username, self.token)
    
# ------------------------------------------------------------------------------------------------
#
#                                       Saving data
#
# ------------------------------------------------------------------------------------------------

def save_git(alleles,genes,model,family):
    repo = pygit2.Repository('Data')
    remo = repo.remotes['origin']

    d = {'family':family,'alleles':alleles}
    model_name = model
    data_path = f'math/{model_name}.json'
    path = os.path.join('Data',data_path)
    #create the file folder path
    if not os.path.exists(os.path.dirname(path)):
        os.makedirs(os.path.dirname(path), exist_ok=True)
    #Open the file
    with open(path,'w') as f:
        json.dump(d,f)

    repo.index.add(data_path)
    repo.index.write()
    reference='HEAD'
    tree = repo.index.write_tree()
    author = pygit2.Signature(os.environ['GITHUB_USERNAME'], os.environ['GITHUB_MAIL'])
    commiter = pygit2.Signature(os.environ['GITHUB_USERNAME'], os.environ['GITHUB_MAIL'])
    oid = repo.create_commit(reference, author, commiter, f'Add data for model {model}', tree, [repo.head.target])
    remo.push(['refs/heads/main'],callbacks=GitHubRemoteCallbacks(os.environ['GITHUB_USERNAME'],os.environ['GITHUB_TOKEN']))