-- One row per drink sold: every unit that was not taken back, whether it is still on an open tab or already
-- settled. Tab.lines and Settlement.lines hold the same unit shape ({ id, addedAt, removedAt }); a unit is in
-- exactly one of them, so nothing is counted twice. Change this view whenever that JSON shape changes.
CREATE VIEW "SoldUnit" AS
SELECT
    t."venueId",
    u->>'id'                                AS "unitId",
    t."id"                                  AS "tabId",
    t."customerName",
    l->>'productId'                         AS "productId",
    l->>'productName'                       AS "productName",
    (l->>'unitPriceInCents')::int           AS "unitPriceInCents",
    (u->>'addedAt')::timestamptz            AS "addedAt",
    -- A night runs until 06:00
    date_trunc('day', (u->>'addedAt')::timestamptz - interval '6 hours', 'Europe/Brussels') AS "night",
    NULL::text                              AS "settlementId",
    NULL::timestamptz                       AS "settledAt",
    NULL::text                              AS "paymentMethod"
FROM "Tab" t,
     jsonb_array_elements(t."lines") l,
     jsonb_array_elements(l->'units') u
WHERE u->>'removedAt' IS NULL

UNION ALL

SELECT
    s."venueId",
    u->>'id',
    s."tabId",
    s."customerName",
    l->>'productId',
    l->>'productName',
    (l->>'unitPriceInCents')::int,
    (u->>'addedAt')::timestamptz,
    date_trunc('day', (u->>'addedAt')::timestamptz - interval '6 hours', 'Europe/Brussels'),
    s."id",
    s."settledAt" AT TIME ZONE 'UTC',
    s."paymentMethod"
FROM "Settlement" s,
     jsonb_array_elements(s."lines") l,
     jsonb_array_elements(l->'units') u
WHERE u->>'removedAt' IS NULL;