#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2017 lafrite <lafrite@Poivre>
#
# Distributed under terms of the MIT license.

"""
Git hook to ensure validity of all rst files
"""

from git import Repo
from pathlib import Path
import re
import time
import restructuredtext_lint
import sys

import logging

formatter = logging.Formatter('%(name)s :: %(levelname)s :: %(message)s')
steam_handler = logging.StreamHandler()
#steam_handler = logging.FileHandler('logging.conf')
steam_handler.setLevel(logging.DEBUG)
steam_handler.setFormatter(formatter)

# création de l'objet logger qui va nous servir à écrire dans les logs
logger = logging.getLogger("precommit")
# on met le niveau du logger à DEBUG, comme ça il écrit tout
logger.setLevel(logging.WARNING)
logger.addHandler(steam_handler)

# Files selection

def get_commited_files(repo):
    hdiff = repo.head.commit.diff()
    diff = {"A":[], "M":[]}
    for f in hdiff.iter_change_type("A"):
        diff["A"].append(f.b_path)
    for f in hdiff.iter_change_type("M"):
        diff["M"].append(f.b_path)

    return diff

def select_by_extension(files, ext="rst"):
    return [i for i in files if i.split(".")[-1] == ext]

# Rst linter

def rst_lint(filename):
    with open(filename, 'r') as f:
        errors = restructuredtext_lint.lint(f.read())
    for e in errors:
        logger.warning(f"{filename} \n{e.full_message}\n")
    return errors


# Rst parameters normalize

def normalize_file(filename, normalizers = {}):
    logger.debug(f"Normalizing {filename}")
    logger.debug(f"With {normalizers}")
    new_file = ""
    modified_lines = []
    with open(filename, 'r') as f:
        for l in f.readlines():
            new_line = run_normalizers(l, normalizers)
            if new_line != l:
                modified_lines.append(f"{l}")
                logger.warning(f"{filename}\n\t{l}\t{new_line}")
            new_file += new_line

    with open(filename, "w") as f:
        f.write(new_file)
    logger.debug(f"{filename} written")

    return modified_lines

def run_normalizers(line, normalizers):
    for c in normalizers:
        obs = re.search(c, line)
        if obs:
            logger.debug(f"Find for {c}")
            return normalizers[c](line)
    return line

# Rst function tools

def update_date(line):
    date = time.strftime("%Y-%m-%d")
    logger.debug(f"Update Date to: {date}")
    return f":date: {date}\n"

def update_modified(line):
    modified = time.strftime("%Y-%m-%d")
    logger.debug(f"Update modified to: {modified}")
    return f":modified: {modified}\n"

def normalize_tags(line):
    logger.debug(f"Normaizing tags")
    tags = line.split(":")[-1]
    tags = [i.strip().capitalize() for i in tags.split(",")]
    tags_str = ", ".join(tags)
    return f":tags: {tags_str}\n"

NORMALIZERS_MODIFIED = {":modified:.*": update_modified,
        ":tags:.*": normalize_tags,
        }

NORMALIZERS_NEW = {":date:.*": update_date,
        ":modified:.*": update_modified,
        ":tags:.*": normalize_tags,
        }

if __name__ == "__main__":
    r = Repo()
    diff = get_commited_files(r)

    errors = []
    modified = []

    # New files
    for f in select_by_extension(diff["A"], "rst"):
        errors += rst_lint(f)
        modified += normalize_file(f, NORMALIZERS_NEW)
        r.index.add([f])
    # Modified files
    for f in select_by_extension(diff["M"], "rst"):
        errors += rst_lint(f)
        modified += normalize_file(f, NORMALIZERS_MODIFIED)
        r.index.add([f])

    if len(errors) > 0:
        logger.warning("Errors in rst formating, commit aborted")
        sys.exit(1)



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