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import { parsePatchFiles, type FileDiffMetadata } from "@pierre/diffs"
import { sampledChecksum } from "@opencode-ai/util/encode"
import { formatPatch, structuredPatch } from "diff"
import type { SnapshotFileDiff, VcsFileDiff } from "@opencode-ai/sdk/v2"
type LegacyDiff = {
file: string
patch?: string
before?: string
after?: string
additions: number
deletions: number
status?: "added" | "deleted" | "modified"
}
type ReviewDiff = SnapshotFileDiff | VcsFileDiff | LegacyDiff
export type ViewDiff = {
file: string
patch: string
additions: number
deletions: number
status?: "added" | "deleted" | "modified"
fileDiff: FileDiffMetadata
}
const cache = new Map<string, FileDiffMetadata>()
function empty(file: string, key: string) {
return {
name: file,
type: "change",
hunks: [],
splitLineCount: 0,
unifiedLineCount: 0,
isPartial: true,
deletionLines: [],
additionLines: [],
cacheKey: key,
} satisfies FileDiffMetadata
}
function patch(diff: ReviewDiff) {
if (typeof diff.patch === "string") return diff.patch
return formatPatch(
structuredPatch(
diff.file,
diff.file,
"before" in diff && typeof diff.before === "string" ? diff.before : "",
"after" in diff && typeof diff.after === "string" ? diff.after : "",
"",
"",
{ context: Number.MAX_SAFE_INTEGER },
),
)
}
function file(file: string, patch: string) {
const hit = cache.get(patch)
if (hit) return hit
const key = sampledChecksum(patch) ?? file
const value = parsePatchFiles(patch, key).flatMap((item) => item.files)[0] ?? empty(file, key)
cache.set(patch, value)
return value
}
export function normalize(diff: ReviewDiff): ViewDiff {
const next = patch(diff)
return {
file: diff.file,
patch: next,
additions: diff.additions,
deletions: diff.deletions,
status: diff.status,
fileDiff: file(diff.file, next),
}
}
export function text(diff: ViewDiff, side: "deletions" | "additions") {
if (side === "deletions") return diff.fileDiff.deletionLines.join("")
return diff.fileDiff.additionLines.join("")
}
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