timezone maddness

.gitignore

@@ -1,4 +1,4 @@
 venv
-data/.cache.csv
+src/tww/data/.cache.csv
 __pycache__
 .idea

src/tww/data/.cache.csv

@@ -4,3 +4,16 @@ bulgaria,43.0,25.0
 usa,39.7563889,46.7511101
 brazil,-10.0,-55.0
 sydney,-33.86785,151.2073212
+sofia,42.6975135,23.3241463
+eastern,-40.9597222,175.6575012
+PT,40.44151435,-80.0100857539989
+PT,40.44151435,-80.0100857539989
+PT,40.44151435,-80.0100857539989
+new york,40.7142691,-74.0059738
+delhi,28.6666667,77.2166672
+krivodol,43.389659,23.502923804029
+vratsa,43.21,23.5625
+plovdiv,42.15,24.75
+studena,41.9158333,21.5305557
+burdo,9.5166667,45.5333328
+burgas,42.5,27.4666672

src/tww/tww.py

@@ -6,9 +6,13 @@ Find time now, in the past or future in any timezone or location.
 import argparse
 import logging
 import os
+from collections import defaultdict
 
 import dateparser
 from datetime import datetime
+
+import pytz
+from pytz import timezone
 from pytz.exceptions import UnknownTimeZoneError
 
 FUZZ_THRESHOLD = 70
@@ -73,18 +77,33 @@ def normalize_words_to_number(query):
     return normal
 
 
+pytz_all_timezones = pytz.all_timezones
+NORMALIZED_TZ_DICT = dict(zip([tz.lower() for tz in pytz_all_timezones], pytz_all_timezones))
+
+NORMALIZED_TZ_ABBR = defaultdict(set)
+TZ_ABBRS_REVERSE = defaultdict(set)
+for x_tz in pytz_all_timezones:
+    dst_tzname = pytz.timezone(x_tz).localize(datetime.now(), is_dst=True).tzname()
+    nodst_tzname = pytz.timezone(x_tz).localize(datetime.now(), is_dst=False).tzname()
+    NORMALIZED_TZ_ABBR[dst_tzname.lower()].add(x_tz)
+    NORMALIZED_TZ_ABBR[nodst_tzname.lower()].add(x_tz)
+    TZ_ABBRS_REVERSE[x_tz].add(dst_tzname)
+    TZ_ABBRS_REVERSE[x_tz].add(nodst_tzname)
+
+
 def timezone_to_normal(query):
     """
     Makes a timezone written in wrong capitalization to correct one 
     as expected by IANA. E.g.:
         america/new_york -> America/New_York
     """
-    import re
-
     # The magic in the regex is that it splits by either / OR _ OR -
     # where the | are OR; and then the parens ( ) keep the splitting
     # entries in the list so that we can join later
-    normal = ''.join(x.capitalize() for x in re.split('(/|_|-)', query))
+
+    normal = NORMALIZED_TZ_DICT.get(query, "")
+    if not normal:
+        normal = NORMALIZED_TZ_ABBR.get(query, "")
     logger.debug("Normalized timezone: {} -> {}".format(query, normal))
     return normal
 
@@ -152,8 +171,8 @@ def resolve_location_local(query):
     try:
         result = heappop(heap)
     except IndexError:
-        logger.critical("Could not find location {}".format(query))
-        exit(1)
+        logger.error("Could not find location {}".format(query))
+        return ""
     ratio, location = result
     logger.debug("Location result ({}): {}".format(-ratio, location))
     write_to_cache(query, location)
@@ -207,17 +226,34 @@ def parse_query(query):
     return human_dt, human_tz_loc
 
 
+def serialize_location(location):
+    return {
+        "name": location.name,
+        "latitude": location.latitude,
+        "longitude": location.longitude,
+    }
+
+
 def resolve_timezone(query):
-    result = ""
+    if not query:
+        query = "utc"
+    # if the human_tz_loc contains /, assume it's a timezone which could be
+    # incorrectly written with small letters - need Continent/City
+    normal_query = query.lower().strip()
+    found_from_iana_tz = NORMALIZED_TZ_DICT.get(normal_query, "")
+    found_from_abbr_tzs = list(NORMALIZED_TZ_ABBR.get(normal_query, set()))
+    normal_tz = found_from_iana_tz
+    if not normal_tz:
+        if found_from_abbr_tzs:
+            normal_tz = list(found_from_abbr_tzs)[0]
+    tz_abbrs = list(TZ_ABBRS_REVERSE.get(normal_tz, set()))
+    logger.debug("Normalized timezone: {} -> {}".format(query, normal_tz))
+    local_location, remote_location = {}, {}
     try:
-        dateparser.parse(str(datetime.now()), settings={'TO_TIMEZONE': query})
-        # if the human_tz_loc contains /, assume it's a timezone which could be
-        # incorrectly written with small letters - need Continent/City
-        if "/" in query:
-            result = timezone_to_normal(query)
+        pytz_result = timezone(normal_tz)
     except UnknownTimeZoneError:
         from timezonefinder import TimezoneFinder
-        logger.debug("No timezone: {}".format(query))
+        logger.debug("No timezone: {}".format(normal_tz))
         # if the human_tz_loc contains /, assume it's a timezone
         # the timezone could still be guessed badly, attempt to get the city
         # e.g.america/dallas
@@ -228,14 +264,37 @@ def resolve_timezone(query):
         # we don't know this timezone one, assume location
         # Try to get from local file first
         location = resolve_location_local(query)
-        if not location:
+        if location:
+            local_location = serialize_location(location)
+        else:
             # finally go to remote
             location = resolve_location_remote(query)
+            if location:
+                remote_location = serialize_location(location)
         tzf = TimezoneFinder()
         loc_tz = tzf.timezone_at(lat=location.latitude, lng=location.longitude)
         logger.debug("Timezone: {}".format(loc_tz))
-        result = loc_tz
-    return result
+        try:
+            pytz_result = timezone(loc_tz)
+        except UnknownTimeZoneError:
+            pytz_result = type('pytz', (), {"zone": ""})
+    tz_name = pytz_result.zone
+    tz_abbr = pytz_result.localize(datetime.now()).strftime('%Z') if tz_name else ""
+    tz_offset = pytz_result.localize(datetime.now()).strftime('%z') if tz_name else ""
+    return {
+        "query": query,
+        "normal_query": normal_query,
+        "found_from_iana_tz": found_from_iana_tz,
+        "found_from_abbr_tzs": found_from_abbr_tzs,
+        "local_location": local_location,
+        "remote_location": remote_location,
+        "search_pytz": normal_tz,
+        "tz_abbrs": tz_abbrs,
+        "tz": normal_tz,
+        "tz_name": tz_name,
+        "tz_abbr": tz_abbr,
+        "tz_offset": tz_offset,
+    }
 
 
 def solve_query(human_dt, human_tz_loc):
@@ -244,13 +303,13 @@ def solve_query(human_dt, human_tz_loc):
         result = dateparser.parse(human_dt, settings={'RETURN_AS_TIMEZONE_AWARE': True})
         logger.debug("human_dt result: {}".format(result))
         if human_tz_loc:
-            human_tz_loc = resolve_timezone(human_tz_loc)
+            human_tz_loc = resolve_timezone(human_tz_loc)["tz_name"]
             isofmt = result.isoformat()
             logger.debug("human_dt isofmt: {}".format(isofmt))
             result = dateparser.parse(isofmt, settings={'TO_TIMEZONE': human_tz_loc})
             logger.debug("human_dt to_timezone result: {}".format(result))
     except UnknownTimeZoneError:
-        loc_tz = resolve_timezone(human_tz_loc)
+        loc_tz = resolve_timezone(human_tz_loc)["tz_name"]
         result = dateparser.parse(human_dt, settings={'TO_TIMEZONE': loc_tz})
     return result