#!/usr/bin/env python3
import csv
import datetime as dt
import pathlib as p
import panflute as pf

def prepare(doc):
    date_str = p.Path(doc.get_metadata("path", "")).stem
    name_date = dt.date(*[
        int(i)
        for i in date_str.split("-")
    ])
    diary_dir = p.Path(doc.get_metadata("diary_dir", ""))
    diary_entries = [
        dt.date.fromisoformat(_p.stem)
        for _p in sorted(diary_dir.iterdir(), key=lambda i: i.stem)
    ]
    index = diary_entries.index(name_date)
    
    try:
        prev = diary_entries[index-1]
    except:
        prev = None
    try:
        _next = diary_entries[index+1]
    except:
        _next = None

def action(elem, doc):
    pass

def finalize(doc):
    pass

def main(doc=None):
    return pf.run_filter(action, prepare=prepare, finalize=finalize, doc=doc) 

if __name__ == "__main__":
    main()