-- EMEX Data Migration: emex DB → sase DB via postgres_fdw
-- Both DBs on same PG server (100.66.11.79)
-- Run as: psql -h 100.66.11.79 -U sase -d sase -f scripts/emex-migrate.sql

BEGIN;

-- ─── 1. Setup FDW ──────────────────────────────────
CREATE EXTENSION IF NOT EXISTS postgres_fdw;

DO $$ BEGIN
  IF NOT EXISTS (SELECT 1 FROM pg_foreign_server WHERE srvname = 'emex_server') THEN
    CREATE SERVER emex_server FOREIGN DATA WRAPPER postgres_fdw OPTIONS (dbname 'emex');
  END IF;
END $$;

DO $$ BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM pg_user_mapping
    WHERE umuser = (SELECT usesysid FROM pg_user WHERE usename = 'sase')
    AND umserver = (SELECT oid FROM pg_foreign_server WHERE srvname = 'emex_server')
  ) THEN
    CREATE USER MAPPING FOR sase SERVER emex_server OPTIONS (user 'sase', password 'f2bbcab1e2ad5c00cef3aeb4f8f48c8d774e1f2436cd86ab');
  END IF;
END $$;

-- Create schema for foreign tables
CREATE SCHEMA IF NOT EXISTS emex_foreign;

-- Import foreign tables
IMPORT FOREIGN SCHEMA public
  LIMIT TO (catalogs, vehicles, part_groups, parts, part_numbers, vehicle_groups, vehicle_parts, part_images)
  FROM SERVER emex_server INTO emex_foreign;

-- ─── 2. Temp mapping tables (emex int id → sase uuid) ──────
CREATE TEMP TABLE _map_catalogs (source_id int PRIMARY KEY, uuid uuid NOT NULL);
CREATE TEMP TABLE _map_vehicles (source_id int PRIMARY KEY, uuid uuid NOT NULL);
CREATE TEMP TABLE _map_groups (source_id int PRIMARY KEY, uuid uuid NOT NULL);
CREATE TEMP TABLE _map_parts (source_id int PRIMARY KEY, uuid uuid NOT NULL);

-- ─── 3. Migrate catalogs (55 rows) ─────────────────
INSERT INTO emex_catalogs (catalog_id, code, brand_name, description, source_id)
SELECT
  c.code,
  c.code,
  COALESCE(c.brand, c.name),
  c.name,
  c.id
FROM emex_foreign.catalogs c
ON CONFLICT (catalog_id) DO NOTHING;

INSERT INTO _map_catalogs (source_id, uuid)
SELECT ec.source_id, ec.id
FROM emex_catalogs ec
WHERE ec.source_id IS NOT NULL;

-- ─── 4. Migrate vehicles (12,561 rows) ─────────────
INSERT INTO emex_vehicles (
  catalog_id, vehicle_id, name, engine, engine_code,
  body_type, transmission, drive_type, fuel_type,
  year_from, year_to, ssd, options_raw, raw_data, source_id
)
SELECT
  mc.uuid,
  'emex-' || v.id::text,
  v.name,
  v.engine,
  v.engine_code,
  v.body_type,
  v.transmission,
  v.drive_type,
  v.fuel_type,
  v.year_from,
  v.year_to,
  v.ssd,
  v.options->>'raw',
  v.options,
  v.id
FROM emex_foreign.vehicles v
JOIN _map_catalogs mc ON mc.source_id = v.catalog_id
ON CONFLICT (vehicle_id) DO NOTHING;

INSERT INTO _map_vehicles (source_id, uuid)
SELECT ev.source_id, ev.id
FROM emex_vehicles ev
WHERE ev.source_id IS NOT NULL;

-- ─── 5. Migrate part_groups (24,415 rows) ───────────
INSERT INTO emex_part_groups (
  emex_catalog_id, group_id, name, name_original,
  parent_group_id, sort_order, has_parts, has_children, source_id
)
SELECT
  mc.uuid,
  pg.group_id,
  COALESCE(pg.name_local, pg.name),
  pg.name,
  pg.parent_id::text,
  pg.sort_order,
  COALESCE(pg.has_parts, false),
  COALESCE(pg.has_children, false),
  pg.id
FROM emex_foreign.part_groups pg
JOIN _map_catalogs mc ON mc.source_id = pg.catalog_id
ON CONFLICT (emex_catalog_id, group_id) DO NOTHING;

INSERT INTO _map_groups (source_id, uuid)
SELECT epg.source_id, epg.id
FROM emex_part_groups epg
WHERE epg.source_id IS NOT NULL;

COMMIT;

-- ─── 6. Migrate parts (1.59M rows) — batched ───────
-- Run outside transaction for large data
\echo 'Migrating parts (1.59M rows)...'

INSERT INTO emex_parts (
  emex_catalog_id, group_id, part_number, name, name_original,
  description, oem_number, source_id
)
SELECT
  mc.uuid,
  mg.uuid,
  p.part_number,
  COALESCE(p.name_local, p.name),
  p.name,
  p.description,
  p.oem_number,
  p.id
FROM emex_foreign.parts p
JOIN _map_catalogs mc ON mc.source_id = p.catalog_id
LEFT JOIN _map_groups mg ON mg.source_id = p.group_id
ON CONFLICT DO NOTHING;

INSERT INTO _map_parts (source_id, uuid)
SELECT ep.source_id, ep.id
FROM emex_parts ep
WHERE ep.source_id IS NOT NULL;

-- ─── 7. Migrate schema_pics (deduplicated by local_path) ────
\echo 'Migrating schema pics (deduplicated)...'

INSERT INTO emex_schema_pics (
  group_id, image_url, original_url, local_path, sort_order
)
SELECT DISTINCT ON (mg.uuid, pi.local_path)
  mg.uuid,
  CASE
    WHEN pi.local_path IS NOT NULL THEN 'https://storage.sase.tr/es/' || replace(pi.local_path, 'images/', '')
    ELSE pi.original_url
  END,
  pi.original_url,
  pi.local_path,
  pi.sort_order
FROM emex_foreign.part_images pi
JOIN _map_groups mg ON mg.source_id = pi.group_id
WHERE pi.group_id IS NOT NULL
  AND pi.local_path IS NOT NULL
ORDER BY mg.uuid, pi.local_path, pi.sort_order
ON CONFLICT (group_id, local_path) DO NOTHING;

-- ─── 8. Migrate vehicle_groups → emex_vehicle_group_links (4.69M) ──
\echo 'Migrating vehicle-group links (4.69M rows)...'

INSERT INTO emex_vehicle_group_links (emex_vehicle_id, emex_group_id, ssd)
SELECT
  mv.uuid,
  mg.uuid,
  vg.ssd
FROM emex_foreign.vehicle_groups vg
JOIN _map_vehicles mv ON mv.source_id = vg.vehicle_id
JOIN _map_groups mg ON mg.source_id = vg.group_id
ON CONFLICT (emex_vehicle_id, emex_group_id) DO NOTHING;

-- ─── 9. Migrate vehicle_parts → emex_vehicle_part_links (83.5M) ──
\echo 'Migrating vehicle-part links (83.5M rows) — this will take a while...'

INSERT INTO emex_vehicle_part_links (emex_vehicle_id, emex_part_id, emex_group_id, quantity, position)
SELECT
  mv.uuid,
  mp.uuid,
  mg.uuid,
  vp.quantity::integer,
  vp.position
FROM emex_foreign.vehicle_parts vp
JOIN _map_vehicles mv ON mv.source_id = vp.vehicle_id
JOIN _map_parts mp ON mp.source_id = vp.part_id
LEFT JOIN _map_groups mg ON mg.source_id = vp.group_id
ON CONFLICT (emex_vehicle_id, emex_part_id, emex_group_id) DO NOTHING;

-- ─── 10. Migrate part_numbers (285M) ───────────────
\echo 'Migrating part numbers (285M rows) — this will take the longest...'

INSERT INTO emex_part_numbers (emex_part_id, oem_code, is_main)
SELECT
  mp.uuid,
  pn.number,
  CASE WHEN pn.number_type = 'OEM' THEN true ELSE false END
FROM emex_foreign.part_numbers pn
JOIN _map_parts mp ON mp.source_id = pn.part_id
ON CONFLICT DO NOTHING;

-- ─── 11. Verification ──────────────────────────────
\echo 'Verifying migration...'

SELECT 'emex_catalogs' as tbl, count(*) FROM emex_catalogs
UNION ALL SELECT 'emex_vehicles', count(*) FROM emex_vehicles
UNION ALL SELECT 'emex_part_groups', count(*) FROM emex_part_groups
UNION ALL SELECT 'emex_parts', count(*) FROM emex_parts
UNION ALL SELECT 'emex_schema_pics', count(*) FROM emex_schema_pics
UNION ALL SELECT 'emex_vehicle_group_links', count(*) FROM emex_vehicle_group_links
UNION ALL SELECT 'emex_vehicle_part_links', count(*) FROM emex_vehicle_part_links
UNION ALL SELECT 'emex_part_numbers', count(*) FROM emex_part_numbers
ORDER BY 1;

-- ─── 12. Cleanup ───────────────────────────────────
DROP TABLE IF EXISTS _map_catalogs;
DROP TABLE IF EXISTS _map_vehicles;
DROP TABLE IF EXISTS _map_groups;
DROP TABLE IF EXISTS _map_parts;

\echo 'Migration complete!'