have location mention nearby islands

pacific-factbook/__main__.py

@@ -1,7 +1,7 @@
 import random
 from string import Template
 
-from . import name, flag, coordinate
+from . import name, flag, coordinate, islands
 
 report_template = Template(
     """
@@ -103,7 +103,9 @@
             <circle cx="100" cy="100" r="40" stroke="#E8D9C5" stroke-width="4" fill="#E8D9C5" />
         </svg>
     """,
-    "location": "The Pacific ocean.",
+    "location": "The Pacific ocean. Close to "
+    + ", ".join(islands.nearby_islands(pos))
+    + ".",
     "coordinates": coords,
     "coastline": f"{random.randint(100, 1_000)} km",
     "climate": "Tropical; hot and humid; wet season May to November.",

pacific-factbook/coordinate.py

@@ -1,13 +1,21 @@
+from random import uniform
 from typing import NamedTuple
+import math
 import numbers
-from random import uniform
 
 
 class Coordinate(NamedTuple):
     latitude: numbers.Real
     longitude: numbers.Real
 
 
+def distance(p1: Coordinate, p2: Coordinate) -> numbers.Real:
+    # FIXME
+    return math.sqrt(
+        (p1.latitude - p2.latitude) ** 2 + (p1.longitude - p2.longitude) ** 2
+    )
+
+
 def generate() -> Coordinate:
     latitude = uniform(-28.3417, -3.6754)
     longitude = uniform(153.6868, 180 + 3.6754)

pacific-factbook/islands.py

@@ -0,0 +1,47 @@
+from typing import NamedTuple, Iterable
+from functools import partial
+from heapq import nsmallest
+
+from . import coordinate
+from .coordinate import Coordinate
+
+
+def nearby_islands(pos: Coordinate) -> Iterable[str]:
+    dist = partial(coordinate.distance, pos)
+    candidates = nsmallest(3, islands, key=lambda x: dist(x.position))
+    return [x.name for x in candidates]
+
+
+class Island(NamedTuple):
+    name: str
+    position: Coordinate
+
+
+def _parse(s: str) -> Coordinate:
+    lat, ns, lon, ew = s.split("_")
+    lat = int(lat)
+    lon = int(lon)
+    if ns == "S":
+        lat = -lat
+    if ew == "w":
+        lon = -lon
+    return Coordinate(latitude=lat, longitude=lon)
+
+
+islands = {
+    Island(name="American Samoa", position=_parse("14_S_170_W")),
+    Island(name="Cook Islands", position=_parse("21_S_159_W")),
+    Island(name="Easter Island", position=_parse("27_S_109_W")),
+    Island(name="French Polynesia", position=_parse("17_S_149_W")),
+    Island(name="Hawaii", position=_parse("21_N_157_W")),
+    Island(name="New Zealand", position=_parse("42_S_173_E")),
+    Island(name="Niue", position=_parse("19_S_169_W")),
+    Island(name="Norfolk Island", position=_parse("29_S_167_E")),
+    Island(name="Pitcairn Islands", position=_parse("25_S_130_W")),
+    Island(name="Samoa", position=_parse("13_S_172_W")),
+    Island(name="Tokelau", position=_parse("9_S_171_W")),
+    Island(name="Tonga", position=_parse("20_S_175_W")),
+    Island(name="Tuvalu", position=_parse("8_S_179_E")),
+    Island(name="Wallis and Futuna", position=_parse("13_S_176_W")),
+    Island(name="Rotuma", position=_parse("12_S_177_E")),
+}