name = "locale_weather_url"
category = "pipeline"
mode = "convert"
description = """
Construct weather API URLs from locale and location information.
Read lines from stdin in the format: LANG_CODE LOCATION
where LANG_CODE is a 2-letter locale (e.g., "en", "fr", "de")
and LOCATION is a city/place name (may contain spaces).

For each line, construct a URL in the format:
  https://LANG.wttr.in/LOCATION

Where spaces in the location are replaced with "+" characters.

If LANG_CODE is empty or invalid (not exactly 2 lowercase letters),
default to "en".

Skip empty lines. Output one URL per input line.
"""

bash_source = '''
#!/bin/bash
while IFS= read -r line || [[ -n "$line" ]]; do
  [[ -z "$line" ]] && continue

  # Extract lang code (first field)
  lang=$(echo "$line" | awk '{print $1}')

  # Extract location (everything after first field)
  location=$(echo "$line" | sed 's/^[^ ]* *//')

  # Validate lang code: must be exactly 2 lowercase letters
  if [[ ! "$lang" =~ ^[a-z]{2}$ ]]; then
    lang="en"
  fi

  # If location is same as lang (single-word line), skip
  if [[ "$location" == "$lang" || -z "$location" ]]; then
    location=""
  fi

  # Replace spaces with +
  location=$(echo "$location" | tr ' ' '+')

  echo "https://$lang.wttr.in/$location"
done
'''

[[test_cases]]
description = "Various locales and locations"
stdin = """en New York
fr Paris
de Berlin
ja Tokyo"""
expected_stdout = """https://en.wttr.in/New+York
https://fr.wttr.in/Paris
https://de.wttr.in/Berlin
https://ja.wttr.in/Tokyo"""

[[test_cases]]
description = "Multi-word locations"
stdin = """en San Francisco
es Buenos Aires
pt Rio de Janeiro"""
expected_stdout = """https://en.wttr.in/San+Francisco
https://es.wttr.in/Buenos+Aires
https://pt.wttr.in/Rio+de+Janeiro"""

[[test_cases]]
description = "Invalid or missing locale defaults to en"
stdin = """ENG London
123 Moscow
x Rome"""
expected_stdout = """https://en.wttr.in/London
https://en.wttr.in/Moscow
https://en.wttr.in/Rome"""