Pricing engine

One pure function (packages/shared/src/pricing.ts) prices every stay. The public quote box, the booking dialog’s auto-price and (later) owner statements all call the same code — totals can never diverge between what the guest saw and what the backoffice books.

The formula

nightly rate  = season price ?? base rate      (global season calendar; a season's
                                                price conditions target all units,
                                                one category or a manual unit list)
              → holiday rules adjust the resolved rate around moving holidays
                (±% on it, an absolute amount on top, or a fixed price)
accommodation = Σ nightly rate
− long-stay discount    (≥28 nights: monthly %, else ≥7 nights: weekly %)
+ cleaning fee          (once per stay)
+ Tourism Dirham        (fee per bedroom per night, capped at 30 nights;
                         studios count as 1 bedroom)
+ VAT                   (default 5% on accommodation − discount + cleaning;
                         the Tourism Dirham is a government levy outside the VAT base*)
= total

* Assumption documented for tax-advisor review; both the VAT rate and the Dirham fee/cap are tenant-configurable (tenants.vat_pct, tourism_fee_per_bedroom_night, tourism_fee_max_nights).

Example — Port de La Mer 2BR, 7 nights

Line	Amount
7 nights × AED 425	AED 2,975
Weekly discount (−6%)	−AED 178.50
Cleaning fee	AED 350
Tourism Dirham (2 BR × 7 nights × AED 10)	AED 140
VAT (5%)	AED 157.33
Total	AED 3,443.83

Rules around the price

• Seasons are global recurring periods (month/day, wrap over New Year allowed). Each season carries price conditions — the same price for everyone, one per category (lifestyle/luxury), or a hand-picked unit list; the most specific matching condition wins (units > category > all).
• Holiday rules are an overlay, not date ranges: they follow the synced dates of a moving holiday (Ramadan, Eid, Easter, CNY …) plus days before/after, and adjust the already-resolved nightly price per condition — ±%, an absolute amount, or a fixed price.
• Minimum stay per unit is enforced in the quote endpoint (422 with the required nights); seasons and holiday rules can raise it for the nights they touch.
• Manual override: the backoffice may replace the auto total (e.g. OTA gross amounts); the override is stored on the booking, the engine’s breakdown remains reproducible.
• All amounts are stored as integer minor units (fils); formatting happens at the edge.

Planned extensions (P3)

Per-day overrides via drag-selection in the price-calendar mode, min-stay per date, and channel-specific rate adjustments.