# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project

"Joker Combo Advisor" — a Steamodded (SMODS) mod for Balatro that scores shop/pack
jokers against the player's current jokers, shows a "Combo Advisor" tooltip on hover,
and pulses strongly recommended cards. Pure Lua, no build step.

## Commands

Syntax check, then run the test suite — **always both, after every edit**:

```sh
luac -p main.lua synergies.lua config.lua test.lua
lua test.lua
```

`test.lua` stubs the handful of game globals `main.lua` touches (the game cannot be
launched headlessly here) and then exercises the real engine, the real database and
the real catalog tab builders. It is the only safety net; there is no other harness.
It enforces, among other things:

- Score tiers: famous explicit pair + tags = 6, hand-type/suit cluster = 4, single
  tag match = 2, generic mult+xmult complement = +1 on top, unrelated = 0.
- **No orphan wants** — a `wants` tag nothing gives is a payoff with no enabler.
- **No dead gives** — a non-engine tag given but never wanted can never change a
  score, so it is invisible dead weight. (This caught `hand_level`, given by Space
  and Burnt Joker and wanted by nobody.)
- **Every theme is discoverable** — theme discovery needs a giver and a wanter on two
  *different* fielded jokers, so a theme with fewer than two members is an
  achievement no player can ever earn and pins the Progress tab under 100% forever.
  (This caught `four_kind`, whose only member was The Family.)
- `theme_info` and `THEME_TABS` cover exactly the same tag set.
- Pair/clash/caution keys all exist; every blurb fits its ~34-char row.
- Every card the catalog pages emplace is materialized (see the UI notes below).
- Jokers with no tags at all are listed in `EXPECTED_INERT` on purpose — a joker
  landing there by accident scores 0 against the entire game and says nothing.

To poke at the engine by hand, copy the stub block from the top of `test.lua`.

## In-game verification (this machine)

- The mod is **symlinked** into the live Mods folder:
  `~/.local/share/Balatro/Mods/JokerComboAdvisor -> ~/Documents/JokerComboAdvisor`
  (this repo). Edits here go live on next game launch — do not copy files anywhere.
  Lovely reads that folder as `C:\users\steamuser\AppData\Roaming\Balatro\Mods`.
- Game: Steam/Proton at `/mnt/games/Steam/steamapps/common/Balatro` (note: second
  Steam library, not the default paths). Lovely injector + Steamodded 1.0.0-beta
  are already installed; mods are managed via Balatro Mod Manager.
- Crash/load logs: `~/.local/share/Balatro/Mods/lovely/log/` (newest file).
- Remote: `https://git.aleshym.co/funman300/JokerComboAdvisor` (private, user's
  Gitea). Pushes authenticate via the repo-local credential helper, which
  reads the token from `~/.config/tea/config.yml` at push time — never copy
  the token into the repo or the remote URL. Commit per feature.

## Architecture

Three-layer split; `JCA` is the single global namespace:

- `synergies.lua` — data only. Returns `{ jokers = {...}, pairs = {...} }`. Each of
  the 150 vanilla jokers gets `gives` (capabilities it adds) and `wants`
  (capabilities that strengthen it) tag lists, converted to sets at the bottom of
  the file. `PAIRS` lists famous explicit combos worth a flat +4.
- `main.lua` — engine + game integration:
  - Scoring: `JCA.score(a, b)` = explicit pair bonus (+4) + 2 per give→want tag
    match in each direction + 1 for the generic "+Mult/+Chips source with an
    ×Mult joker" complement (second return value flags when that +1 applied).
    `JCA.partners_for(card)` aggregates over `G.jokers.cards`; total ≥
    `JCA.config.threshold` ⇒ recommended. The generic +1 counts toward the
    total once per candidate, not per owned joker — since tag/pair scores are
    even and the threshold is 4, the generic bonus alone can never trigger a
    recommendation, so a pulsing card always has a nameable partner. Jokers
    whose multiplier the generic rule misreads opt out with
    `{no_generic = true}` in `synergies.lua` (Joker Stencil: its ×Mult grows
    with *empty* slots, so "+Mult jokers feed it" is backwards).
  - UI hooks: wraps `Card:generate_UIBox_ability_table` to append a tooltip entry
    to `aut.info` (format: array of rows-of-UIT-nodes plus a `.name` string —
    must match what vanilla `info_tip_from_rows` expects), and wraps
    `Card:update` for the ~2.5s pulse on recommended shop cards and the
    partner highlight (hovering a joker juices its owned partners ~0.9s;
    partner set cached on the card as `jca_hl`, dropped when hover ends).
    All hook bodies are pcall-wrapped so a scoring bug can never crash a
    run — keep it that way.
  - Sell advisor: `JCA.weakest_link()` (full board + ≥3 jokers + a strict
    minimum required, else nil) flags the lowest-total owned joker with a
    red verdict row; suppressed by learning mode, toggled by
    `config.sell_advisor`.
  - Public API for other mods: `JCA.register(key, gives, wants, opts)`,
    `JCA.register_pair(a, b, blurb)` (sets `JCA._pairs_dirty` so the
    Combos tab re-sorts), `JCA.register_clash(a, b, warning)`. Unknown
    tags are dropped with a log line, never an error.
  - Config tab: registered on `SMODS.current_mod.config_tab`, guarded by
    `if SMODS.current_mod` so standalone tests don't need full stubs.
  - Synergy catalog: `SMODS.current_mod.extra_tabs` adds Combos/Engine/
    Economy/Hands tabs (plus a text-only Progress tab with discovery
    completion bars) that render real `Card` objects in `CardArea`s
    (collection-style, so hover shows each joker's own tooltip). One theme
    per page; pagers swap the `tab_contents` UIBox from an option-cycle
    callback — the same pattern as SMODS's achievements tab. Because pages
    contain live Card/CardArea objects, tab definitions must be rebuilt on
    every call — never cache the node trees. Cards must be `start_materialize`d
    as they are emplaced (`card_row_node`), exactly as every vanilla collection
    page does — that call *is* the appear animation, and without it cards pop
    in with no animation on tab open and page switch. Only the first card of a
    page build plays the sound (vanilla's `i>1 or j>1` silence flag); tab defs
    call `begin_page()` so the counter spans the page, not one row. The same
    tabs open in-run via a "Combos" HUD button (wrapped `create_UIBox_HUD`,
    injected into the `button_area` node under Run Info/Options); the pagers
    work there because vanilla `create_tabs` also names its body
    `tab_contents`.
  - Discovery: `CardArea:emplace` hook calls `JCA.check_discoveries` when a
    joker lands in `G.jokers`; famous pairs fielded together persist in
    `config.discovered` (saved immediately via `SMODS.save_mod_config`) and
    per-run in `G.GAME.jca_run_combos`. Undiscovered pairs render face-down
    with a `???` caption in the Combos tab; blurb replaces it once fielded.
    Themes (every `theme_info` tag) persist in `config.themes_found` once
    two DIFFERENT jokers connect the tag (giver + wanter; a joker carrying
    both sides needs a second joker). One toast per emplacement, famous
    pair outranking theme. Badge/progress render in `theme_tab_def`; toast
    names come from `JCA.theme_names` (filled after THEME_TABS, used only
    at gameplay time).
  - Post-run recap: wraps `create_UIBox_game_over`/`create_UIBox_win` and
    inserts a "Combos fielded this run" row (from `G.GAME.jca_run_combos`)
    relative to vanilla button ids (`from_game_over`; `from_game_won` or
    `win_cta`) via a parent-trail walk — anchor depths differ per screen.
  - Learning mode (`config.learning_mode`): suppresses the pulse and the
    "Strong pick!" line but never the explanations. No-synergy buy-area
    tooltips show "Looking for:"/"Offers:" hints from `TAG_LABEL`.
    `synergies.lua` also exports `theme_info` (one teaching sentence per
    catalog tag — keep ≤ ~90 chars and cover every THEME_TABS tag).
  - The real (Lovely-patched) game source is readable at
    `~/.local/share/Balatro/Mods/lovely/dump/` — check it before assuming
    what a vanilla function returns or expects.
- `config.lua` — default settings (`pulse`, `owned_tooltip`, `threshold`).
  Steamodded loads and persists this table itself; read it only via
  `SMODS.current_mod.config` (exposed as `JCA.config`).

## Conventions and gotchas

- **Cluster tags** (hand types `pair`/`straight`/`flush`/…, suits, `planet`,
  `spectral_gen`): put the same tag in *both* `gives` and `wants` of every member
  so members mutually reinforce (2+2 = 4). Pure enablers (e.g. Four Fingers,
  Smeared, Pareidolia, DNA) only `give`; pure payoffs only `want`.
- A tag needs **both sides to exist, on at least two different jokers**: something
  must give it, something must want it, or it is dead data that can never change a
  score — and if it is also a theme, an achievement nobody can earn. `lua test.lua`
  enforces both directions; run it after every `synergies.lua` edit.
- Tooltips teach: `JCA.explain(hovered, partner)` picks one reason per partner
  — famous-pair blurb (third element of each `PAIRS` entry), else the first
  `TAG_ORDER` match phrased from `TAG_TEXT` (give/want/both variants), else
  the generic mult×xmult line. Every non-engine tag (anything besides
  mult/chips/xmult) MUST have a `TAG_TEXT` entry; new `PAIRS` entries need a
  blurb under ~34 chars so name + blurb fits one tooltip row.
- Vanilla center keys contain intentional misspellings/abbreviations — do not
  "fix" them: `j_gluttenous_joker`, `j_selzer`, `j_ticket` (Golden Ticket),
  `j_trousers` (Spare Trousers), `j_ring_master` (Showman), `j_caino` (Canio),
  `j_delayed_grat`, `j_todo_list`.
- Unknown joker keys (from other mods) must keep scoring 0 — never index
  `JCA.db[key]` without a nil guard.
- Display names go through `localize{type='name_text', set='Joker', ...}` with a
  pcall + `center.name` fallback.
- Anti-synergies never affect scores. Known traps are warning-only data:
  `CLASHES` (pairwise, red "Clashes -" tooltip line vs owned jokers) and
  `CAUTIONS` (per-joker, buy-area "Caution:" line) in `synergies.lua`, same
  ~34-char blurb budget as `PAIRS`. Learning mode keeps warnings visible.
- The UI hooks are the only untested-in-game surface; if a tooltip regression is
  reported, suspect the `aut.info` entry format first and check the lovely log.