import argparse
import os
import textwrap
from common import topics, get_commit_data_cache
from commitlist import CommitList

# Imports for working with classi
from classifier import CommitClassifier, CategoryConfig, XLMR_BASE, get_author_map, get_file_map, CommitClassifierInputs
import common
import torch
from pathlib import Path

class Categorizer:
    def __init__(self, path, category='Uncategorized', use_classifier:bool = False):
        self.cache = get_commit_data_cache()
        self.commits = CommitList.from_existing(path)
        if use_classifier:
            print("Using a classifier to aid with categorization.")
            device = "cuda" if torch.cuda.is_available() else "cpu"
            classifier_config = CategoryConfig(common.categories)
            author_map = get_author_map(Path("results/classifier"), regen_data=False, assert_stored=True)
            file_map = get_file_map(Path("results/classifier"), regen_data=False, assert_stored=True)
            self.classifier = CommitClassifier(XLMR_BASE, author_map, file_map, classifier_config).to(device)
            self.classifier.load_state_dict(torch.load(Path("results/classifier/commit_classifier.pt")))
            self.classifier.eval()
        else:
            self.classifier = None
        # Special categories: 'Uncategorized'
        # All other categories must be real
        self.category = category

    def categorize(self):
        commits = self.commits.filter(category=self.category)
        total_commits = len(self.commits.commits)
        already_done = total_commits - len(commits)
        i = 0
        while i < len(commits):
            cur_commit = commits[i]
            next_commit = commits[i + 1] if i + 1 < len(commits) else None
            jump_to = self.handle_commit(cur_commit, already_done + i + 1, total_commits, commits)

            # Increment counter
            if jump_to is not None:
                i = jump_to
            elif next_commit is None:
                i = len(commits)
            else:
                i = commits.index(next_commit)

    def features(self, commit):
        return self.cache.get(commit.commit_hash)

    def potential_reverts_of(self, commit, commits):
        submodule_update_str = ['Update TensorPipe submodule',
                                'Updating submodules',
                                'Automated submodule update']
        if any(a in commit.title for a in submodule_update_str):
            return []

        features = self.features(commit)
        if 'Reverted' in features.labels:
            reasons = {'GithubBot': "Reverted"}
        else:
            reasons = {}

        index = commits.index(commit)
        # -8 to remove the (#35011)
        cleaned_title = commit.title[:-10]
        # NB: the index + 2 is sketch
        reasons.update({(index + 2 + delta): cand for delta, cand in enumerate(commits[index + 1:])
                if cleaned_title in cand.title and
                commit.commit_hash != cand.commit_hash})
        return reasons

    def handle_commit(self, commit, i, total, commits):
        potential_reverts = self.potential_reverts_of(commit, commits)
        if potential_reverts:
            potential_reverts = f'!!!POTENTIAL REVERTS!!!: {potential_reverts}'
        else:
            potential_reverts = ""

        features = self.features(commit)
        if self.classifier is not None:
            # Some commits don't have authors:
            author = features.author if features.author else "Unknown"
            files = ' '.join(features.files_changed)
            classifier_input = CommitClassifierInputs(title=[features.title], files=[files], author=[author])
            classifier_category = self.classifier.get_most_likely_category_name(classifier_input)[0]

        else:
            classifier_category = commit.category

        breaking_alarm = ""
        if 'module: bc-breaking' in features.labels:
            breaking_alarm += "\n!!!!!! BC BREAKING !!!!!!"

        if 'module: deprecation' in features.labels:
            breaking_alarm += "\n!!!!!! DEPRECATION !!!!!!"

        os.system('clear')
        view = textwrap.dedent(f'''\
[{i}/{total}]
================================================================================
{features.title}

{potential_reverts} {breaking_alarm}

{features.body}

Files changed: {features.files_changed}

Labels: {features.labels}

Current category: {commit.category}

Select from: {', '.join(common.categories)}

        ''')
        print(view)
        cat_choice = None
        while cat_choice is None:
            print("Enter category: ")
            value = input(f'{classifier_category} ').strip()
            if len(value) == 0:
                # The user just pressed enter and likes the default value
                cat_choice = classifier_category
                continue
            choices = [cat for cat in common.categories
                       if cat.startswith(value)]
            if len(choices) != 1:
                print(f'Possible matches: {choices}, try again')
                continue
            cat_choice = choices[0]
        print(f'\nSelected: {cat_choice}')
        print(f'\nCurrent topic: {commit.topic}')
        print(f'''Select from: {', '.join(topics)}''')
        topic_choice = None
        while topic_choice is None:
            value = input('topic> ').strip()
            if len(value) == 0:
                topic_choice = commit.topic
                continue
            choices = [cat for cat in topics
                       if cat.startswith(value)]
            if len(choices) != 1:
                print(f'Possible matches: {choices}, try again')
                continue
            topic_choice = choices[0]
        print(f'\nSelected: {topic_choice}')
        self.update_commit(commit, cat_choice, topic_choice)
        return None

    def update_commit(self, commit, category, topic):
        assert category in common.categories
        assert topic in topics
        commit.category = category
        commit.topic = topic
        self.commits.write_result()

def main():
    parser = argparse.ArgumentParser(description='Tool to help categorize commits')
    parser.add_argument('--category', type=str, default='Uncategorized',
                        help='Which category to filter by. "Uncategorized", None, or a category name')
    parser.add_argument('--file', help='The location of the commits CSV',
                        default='results/commitlist.csv')
    parser.add_argument('--use_classifier', action='store_true', help="Whether or not to use a classifier to aid in categorization.")

    args = parser.parse_args()
    categorizer = Categorizer(args.file, args.category, args.use_classifier)
    categorizer.categorize()


if __name__ == '__main__':
    main()
