From 25e9d040fff9fab14ab9fd11147ef87d53c2c839 Mon Sep 17 00:00:00 2001
From: Pablo Martin <pablo.martin@superhog.com>
Date: Tue, 25 Jun 2024 11:56:51 +0200
Subject: [PATCH] add internal exchange rates

---
 .../xero/int_xero__bank_transactions.sql      | 23 +++++++++++++------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/models/intermediate/xero/int_xero__bank_transactions.sql b/models/intermediate/xero/int_xero__bank_transactions.sql
index d18f3e3..1280978 100644
--- a/models/intermediate/xero/int_xero__bank_transactions.sql
+++ b/models/intermediate/xero/int_xero__bank_transactions.sql
@@ -1,7 +1,8 @@
 with
     stg_xero__bank_transactions as (
         select * from {{ ref("stg_xero__bank_transactions") }}
-    )
+    ),
+    int_simple_exchange_rates as (select * from {{ ref("int_simple_exchange_rates") }})
 select
     bt.id_bank_transaction,
     bt.id_prepayment,
@@ -10,21 +11,24 @@ select
     bt.transaction_type,
     bt.transaction_status,
     bt.transaction_at_utc,
+    bt.transaction_date_utc,
     bt.date_string,
     bt.total_amount_local_curr,
-    (bt.total_amount_local_curr * bt.exchange_rate_to_gbp)::numeric(
+    (bt.total_amount_local_curr * coalesce(bt.exchange_rate_to_gbp, ser.rate))::numeric(
         18, 4
     ) as total_amount_in_gbp,
     bt.total_amount_wo_tax_local_curr,
-    (bt.total_amount_wo_tax_local_curr * bt.exchange_rate_to_gbp)::numeric(
-        18, 4
-    ) as total_amount_wo_tax_in_gbp,
+    (
+        bt.total_amount_wo_tax_local_curr * coalesce(bt.exchange_rate_to_gbp, ser.rate)
+    )::numeric(18, 4) as total_amount_wo_tax_in_gbp,
     bt.total_tax_local_curr,
-    (bt.total_tax_local_curr * bt.exchange_rate_to_gbp)::numeric(
+    (bt.total_tax_local_curr * coalesce(bt.exchange_rate_to_gbp, ser.rate))::numeric(
         18, 4
     ) as total_tax_in_gbp,
     bt.transaction_currency_iso_4217,
-    bt.exchange_rate_to_gbp,
+    -- We try to use Xero's rate. If no rate is available, we fall back to the
+    -- oficial dwh rate.
+    coalesce(bt.exchange_rate_to_gbp, ser.rate) as exchange_rate_to_gbp,
     bt.line_amount_tax_inclusiveness,
     bt.full_contact_details,
     bt.line_items,
@@ -37,3 +41,8 @@ select
     bt.updated_date_utc,
     bt.dwh_extracted_at_utc
 from stg_xero__bank_transactions bt
+left join
+    int_simple_exchange_rates ser
+    on bt.transaction_currency_iso_4217 = ser.from_currency
+    and ser.to_currency = 'GBP'
+    and bt.transaction_date_utc = ser.rate_date_utc