Android build v1.1.2

src/combat/targeting.ts

@@ -0,0 +1,98 @@
+import type { PartyMember } from '../game'
+
+export type NavigateAction = 'navigateLeft' | 'navigateRight' | 'navigateUp' | 'navigateDown'
+
+type TargetOptions = {
+  livingOnly?: boolean
+}
+
+function canTarget(member: PartyMember, options: TargetOptions) {
+  return !options.livingOnly || member.health > 0
+}
+
+export function selectRelativePartyTarget(
+  party: PartyMember[],
+  selectedId: string,
+  direction: -1 | 1,
+  options: TargetOptions = {},
+) {
+  const candidates = party.filter((member) => canTarget(member, options))
+  if (candidates.length === 0) return null
+  const currentIndex = candidates.findIndex((member) => member.id === selectedId)
+  const nextIndex = currentIndex < 0
+    ? 0
+    : (currentIndex + direction + candidates.length) % candidates.length
+  return candidates[nextIndex]?.id ?? null
+}
+
+export function selectDirectionalPartyTarget(
+  party: PartyMember[],
+  selectedId: string,
+  action: NavigateAction,
+  columns: number,
+  options: TargetOptions = {},
+) {
+  const currentIndex = party.findIndex((member) => member.id === selectedId)
+  if (currentIndex < 0) {
+    return party.find((member) => canTarget(member, options))?.id ?? null
+  }
+  const currentRow = Math.floor(currentIndex / columns)
+  const currentColumn = currentIndex % columns
+  const horizontal = action === 'navigateLeft' || action === 'navigateRight'
+  const candidate = party
+    .map((member, index) => ({
+      member,
+      index,
+      row: Math.floor(index / columns),
+      column: index % columns,
+    }))
+    .filter(({ member, index, row, column }) => {
+      if (!canTarget(member, options) || index === currentIndex) return false
+      if (action === 'navigateLeft') return row === currentRow && column < currentColumn
+      if (action === 'navigateRight') return row === currentRow && column > currentColumn
+      if (action === 'navigateUp') return row < currentRow
+      return row > currentRow
+    })
+    .sort((left, right) => {
+      const leftPrimary = horizontal
+        ? Math.abs(left.column - currentColumn)
+        : Math.abs(left.row - currentRow)
+      const rightPrimary = horizontal
+        ? Math.abs(right.column - currentColumn)
+        : Math.abs(right.row - currentRow)
+      const leftSecondary = horizontal ? 0 : Math.abs(left.column - currentColumn)
+      const rightSecondary = horizontal ? 0 : Math.abs(right.column - currentColumn)
+      return leftPrimary - rightPrimary || leftSecondary - rightSecondary
+    })[0]
+  return candidate?.member.id ?? null
+}
+
+export function selectDirectPartyTarget(
+  party: PartyMember[],
+  slot: number,
+  options: TargetOptions & {
+    targetGroup?: number
+    groupSize?: number
+  } = {},
+) {
+  const groupSize = options.groupSize ?? 6
+  const index = slot + (options.targetGroup ?? 0) * groupSize
+  const member = party[index]
+  return member && canTarget(member, options) ? member.id : null
+}
+
+export function nextTargetGroupSelection(
+  party: PartyMember[],
+  selectedId: string,
+  currentGroup: number,
+  groupSize = 6,
+) {
+  const groupCount = Math.max(1, Math.ceil(party.length / groupSize))
+  const nextGroup = (currentGroup + 1) % groupCount
+  const selectedIndex = party.findIndex((member) => member.id === selectedId)
+  const slot = selectedIndex < 0 ? 0 : selectedIndex % groupSize
+  return {
+    group: nextGroup,
+    selectedId: party[slot + nextGroup * groupSize]?.id ?? null,
+  }
+}