Deck Synergy Analysis

[Doberjohn]

Part of #204

Description

Analyze a deck's synergies client-side using pre-computed synergy data, triggered by a CTA button.

Requirements

• "Analyze Synergies" CTA button in deck builder
• Load pre-computed synergy JSON files for each unique card in the deck
• Cross-reference all synergy pairs that exist within the deck
• Calculate deck synergy score using weighted sum formula
• Display: single deck synergy score number
• Loading state while fetching/computing (could be non-trivial for 60-card decks)

Weighted Sum Formula

Perfect (9-10): score × 3
Strong  (7-8):  score × 2
Moderate (4-6): score × 1
Weak    (<4):   score × 0.5

Deck Score = sum of all weighted pair scores

Architecture

• Entirely client-side — no API needed
• Synergy data already exists as /data/synergies/{cardId}.json files
• For a 60-card deck: load synergy files for each unique card (~15-25 fetches), find intersecting pairs
• Consider web worker if computation blocks UI

Phase

Phase 3 (weeks 5-6) — depends on deck builder UI existing and benefits from all rules being landed

Future Enhancements

• Breakdown by playstyle
• Top synergy pairs list
• "Cards that would improve your deck" suggestions
• Live analysis (as you add cards) instead of CTA-triggered

Files

• apps/web/src/features/deck/hooks/useDeckAnalysis.ts