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adventure: tell Pete whether a backpack item beats what's worn

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For each backpack magic item, compute the per-stat diff against whatever
occupies the slot it would equip into (mi.Slot — the same slot the web
Equip button targets, so the card describes the trade that actually
happens). The verdict is strict dominance: all-gain is an upgrade, all-loss
a downgrade, mixed a sidegrade with no winner claimed (the case the two
opaque effect strings could never show). Empty slot reads 'new'; an
attunement item with no free bond reads 'inert', which overrides the stat
verdict because wearing it does nothing.

The diff is over tempered effects on both sides and reuses the engine's
own magicItemEffectFor, so nothing here re-derives power math that could
drift from the game. Rides an additive Compare object on the private
backpack ItemView — no migration, no endpoint, no public surface.

Rings collapse to the same path: every ring equips to ring_1 (ring_2 is
declared but never assigned by any live code), so a backpack ring simply
compares against the ring_1 occupant.
This commit is contained in:
prosolis
2026-07-17 10:04:18 -07:00
parent 22b7949791
commit 7e59697754
3 changed files with 347 additions and 0 deletions
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35
internal/peteclient/client.go
View File

@@ -423,6 +423,41 @@ type ItemView struct {
Effect string `json:"effect,omitempty"`
Attunement bool `json:"attunement,omitempty"`
Attuned bool `json:"attuned,omitempty"`
// Compare pairs a backpack magic item against whatever is worn in the slot it
// would equip into, so the owner can tell an upgrade from a sidegrade without
// eyeballing two opaque effect strings. Set only on backpack magic items (the
// ones that carry an equip ID); worn and vault rows never have it. Owner-private,
// rides detail_json — no migration, no public surface.
Compare *ItemCompare `json:"compare,omitempty"`
}
// ItemCompare is the per-stat verdict for equipping a backpack magic item over
// what is currently worn in its slot. gogobee computes it (the power math folds
// in tempering and bond availability, which live in the engine); Pete only
// renders it and does no arithmetic.
type ItemCompare struct {
// Verdict is one of: upgrade, downgrade, sidegrade, same, new, inert.
// upgrade every changed stat a gain
// downgrade every changed stat a loss
// sidegrade mixed — some better, some worse; no winner claimed
// same no stat differs
// new the target slot is empty; equipping fills it
// inert needs a bond and none is free — wearing it would do nothing
Verdict string `json:"verdict"`
// VsName is the worn item being replaced; "" when Verdict is new (empty slot).
VsName string `json:"vs_name,omitempty"`
// VsSlot is the slot the item would land in (e.g. "ring_1").
VsSlot string `json:"vs_slot,omitempty"`
// Deltas is one entry per changed stat, each flagged better/worse. Engine-
// rendered player-facing text; Pete draws arrows off Better and does no math.
Deltas []ItemDelta `json:"deltas,omitempty"`
}
// ItemDelta is one stat's change between the candidate item and the worn item.
type ItemDelta struct {
Label string `json:"label"`
Better bool `json:"better"`
Text string `json:"text"`
}
// HouseView is the owner's housing summary.