-- =============================================================================
-- Gallery: one-time split Gallery → gallery_prod + gallery_dev
-- =============================================================================
--
-- WHERE TO RUN: pgAdmin on your **dev PC** (192.168.10.70)
--   NOT on TrueNAS shell — psql is not required on TrueNAS.
--
-- BEFORE YOU START (dev PC, normal PowerShell in repo folder):
--   1. Stop Gallery if running: close terminals with dev:web / dev:server / dev:client
--   2. Stop the prod container on TrueNAS if it already exists (Apps → gallery-web → Stop)
--
-- pgAdmin SETUP:
--   1. Open pgAdmin
--   2. Register server (if needed):
--        Host: 192.168.10.122
--        Port: 5432
--        Maintenance database: postgres
--        Username: postgres          ← must be superuser, NOT gallery
--        Password: (your postgres password)
--   3. In the tree: Servers → (your server) → Databases → **postgres**
--   4. Right-click **postgres** → Query Tool
--   5. File → Open → select this file (db/split-dev-prod-pgadmin.sql)
--   6. Run in order: highlight STEP 0 → Execute (F5), then STEP 1, STEP 2, …
--
-- IMPORTANT: Run each STEP block separately (highlight one STEP section, F5).
--            CREATE DATABASE (STEP 3) must NOT run inside a transaction with other steps.
--
-- AFTER SUCCESS:
--   On dev PC (normal PowerShell, repo root):
--     npm run migrate
--     npm run dev:web
--   Open http://devgallery.mysuperlab.netcraze.pro
--
-- =============================================================================


-- =============================================================================
-- STEP 0 — Pre-flight (read-only). Run this first.
-- Expected before split: one row with datname = Gallery
-- Expected after split:  gallery_prod and gallery_dev
-- =============================================================================

SELECT datname, pg_size_pretty(pg_database_size(datname)) AS size
FROM pg_database
WHERE datname IN ('Gallery', 'gallery', 'gallery_prod', 'gallery_dev')
ORDER BY datname;


-- =============================================================================
-- STEP 1 — Disconnect all clients from Gallery databases
-- Run on database: postgres
-- =============================================================================

SELECT pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname IN ('Gallery', 'gallery', 'gallery_prod', 'gallery_dev')
  AND pid <> pg_backend_pid();


-- =============================================================================
-- STEP 2 — Rename legacy database → gallery_prod
-- Run on database: postgres
-- Skip this step if STEP 0 already shows gallery_prod (split already done).
-- Run ONLY ONE of the two ALTER lines below (whichever matches STEP 0):
-- =============================================================================

-- Use this if STEP 0 showed datname = Gallery (capital G):
ALTER DATABASE "Gallery" RENAME TO gallery_prod;

-- OR use this if STEP 0 showed datname = gallery (all lowercase) — comment out the line above:
-- ALTER DATABASE gallery RENAME TO gallery_prod;


-- =============================================================================
-- STEP 3 — Clone gallery_dev from gallery_prod
-- Run on database: postgres
-- Skip if gallery_dev already exists in STEP 0.
-- Takes 1–2 minutes for ~1000 paintings. Do not run twice.
-- =============================================================================

SELECT pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname = 'gallery_prod'
  AND pid <> pg_backend_pid();

CREATE DATABASE gallery_dev WITH TEMPLATE gallery_prod;


-- =============================================================================
-- STEP 4 — Grants for app user
-- Run on database: postgres
-- =============================================================================

GRANT ALL PRIVILEGES ON DATABASE gallery_dev TO gallery;
GRANT ALL PRIVILEGES ON DATABASE gallery_prod TO gallery;


-- =============================================================================
-- STEP 5 — Verify databases (read-only)
-- Run on database: postgres
-- Expected: gallery_prod and gallery_dev (Gallery gone)
-- =============================================================================

SELECT datname, pg_size_pretty(pg_database_size(datname)) AS size
FROM pg_database
WHERE datname IN ('Gallery', 'gallery', 'gallery_prod', 'gallery_dev')
ORDER BY datname;


-- =============================================================================
-- STEP 6 — Verify row count
--
-- *** IMPORTANT: Query Tool must be connected to gallery_dev, NOT postgres ***
--
-- In pgAdmin:
--   1. Close this Query Tool tab (or ignore postgres connection)
--   2. Tree: Servers → your server → Databases → **gallery_dev**
--   3. Right-click **gallery_dev** → Query Tool   ← new tab, new connection
--   4. Paste and run ONLY the two lines below (F5)
--
-- If current_database() is not gallery_dev, you will get "relation paintings does not exist"
-- =============================================================================

SELECT current_database() AS connected_to;   -- must show: gallery_dev

SELECT count(*) AS painting_count FROM paintings;   -- expect ~1088