-- City dimension: canonical city records with population and venue count.
-- Built from Eurostat Urban Audit codes joined to venue locations.
-- Cities without Eurostat coverage (US, non-EU) are derived from venue clusters.

MODEL (
  name foundation.dim_cities,
  kind FULL,
  cron '@daily',
  grain city_code
);

WITH -- Eurostat cities: latest population per city code
eurostat_cities AS (
  SELECT
    city_code,
    country_code,
    population,
    ref_year,
    LOWER(REPLACE(city_code, country_code, ''))  AS city_slug_raw
  FROM staging.stg_population
  QUALIFY ROW_NUMBER() OVER (PARTITION BY city_code ORDER BY ref_year DESC) = 1
),
-- Venue counts per (country_code, city) from dim_venues
venue_counts AS (
  SELECT
    country_code,
    city,
    COUNT(*)  AS venue_count,
    AVG(lat)  AS centroid_lat,
    AVG(lon)  AS centroid_lon
  FROM foundation.dim_venues
  WHERE city IS NOT NULL AND city != ''
  GROUP BY country_code, city
),
-- Eurostat city label mapping to canonical city names
-- (Eurostat uses codes like DE001C → Berlin; we keep both)
eurostat_labels AS (
  SELECT DISTINCT
    city_code,
    country_code,
    -- Derive a slug-friendly city name from the code as fallback
    LOWER(REPLACE(city_code, country_code, ''))  AS city_slug_raw
  FROM eurostat_cities
),
-- Country-level median income (latest year per country)
country_income AS (
  SELECT country_code, median_income_pps, ref_year AS income_year
  FROM staging.stg_income
  QUALIFY ROW_NUMBER() OVER (PARTITION BY country_code ORDER BY ref_year DESC) = 1
)
SELECT
  ec.city_code,
  ec.country_code,
  COALESCE(vc.city, ec.city_code)               AS city_name,
  LOWER(REGEXP_REPLACE(
    COALESCE(vc.city, ec.city_slug_raw), '[^a-z0-9]+', '-'
  ))                                             AS city_slug,
  -- Human-readable country name for pSEO templates and internal linking
  CASE ec.country_code
    WHEN 'DE' THEN 'Germany'
    WHEN 'ES' THEN 'Spain'
    WHEN 'GB' THEN 'United Kingdom'
    WHEN 'FR' THEN 'France'
    WHEN 'IT' THEN 'Italy'
    WHEN 'PT' THEN 'Portugal'
    WHEN 'AT' THEN 'Austria'
    WHEN 'CH' THEN 'Switzerland'
    WHEN 'NL' THEN 'Netherlands'
    WHEN 'BE' THEN 'Belgium'
    WHEN 'SE' THEN 'Sweden'
    WHEN 'NO' THEN 'Norway'
    WHEN 'DK' THEN 'Denmark'
    WHEN 'FI' THEN 'Finland'
    WHEN 'US' THEN 'United States'
    WHEN 'AR' THEN 'Argentina'
    WHEN 'MX' THEN 'Mexico'
    WHEN 'AE' THEN 'UAE'
    WHEN 'AU' THEN 'Australia'
    WHEN 'IE' THEN 'Ireland'
    ELSE ec.country_code
  END                                            AS country_name_en,
  -- URL-safe country slug derived from country_name_en
  LOWER(REGEXP_REPLACE(
    CASE ec.country_code
      WHEN 'DE' THEN 'Germany'
      WHEN 'ES' THEN 'Spain'
      WHEN 'GB' THEN 'United Kingdom'
      WHEN 'FR' THEN 'France'
      WHEN 'IT' THEN 'Italy'
      WHEN 'PT' THEN 'Portugal'
      WHEN 'AT' THEN 'Austria'
      WHEN 'CH' THEN 'Switzerland'
      WHEN 'NL' THEN 'Netherlands'
      WHEN 'BE' THEN 'Belgium'
      WHEN 'SE' THEN 'Sweden'
      WHEN 'NO' THEN 'Norway'
      WHEN 'DK' THEN 'Denmark'
      WHEN 'FI' THEN 'Finland'
      WHEN 'US' THEN 'United States'
      WHEN 'AR' THEN 'Argentina'
      WHEN 'MX' THEN 'Mexico'
      WHEN 'AE' THEN 'UAE'
      WHEN 'AU' THEN 'Australia'
      WHEN 'IE' THEN 'Ireland'
      ELSE ec.country_code
    END, '[^a-zA-Z0-9]+', '-'
  ))                                             AS country_slug,
  COALESCE(vc.centroid_lat, 0::DOUBLE)           AS lat,
  COALESCE(vc.centroid_lon, 0::DOUBLE)           AS lon,
  ec.population,
  ec.ref_year                                    AS population_year,
  COALESCE(vc.venue_count, 0)                    AS padel_venue_count,
  ci.median_income_pps,
  ci.income_year
FROM eurostat_cities ec
LEFT JOIN venue_counts vc
  ON  ec.country_code = vc.country_code
  AND LOWER(TRIM(vc.city)) LIKE '%' || LOWER(LEFT(ec.city_code, 2)) || '%'
LEFT JOIN country_income ci
  ON ec.country_code = ci.country_code