lib: idea-code generator + plan_md yaml-frontmatter parser (M12 T-494)

- lib/idea-code.ts: pure formatIdeaCode helper (client-safe, no prisma)
- lib/idea-code-server.ts: atomic nextIdeaCode via Prisma row-lock,
  accepts optional TransactionClient for combining with idea.create
- lib/idea-plan-parser.ts: parsePlanMd extracts ---yaml---/body, runs
  yaml.parse + ideaPlanMdFrontmatterSchema, returns line-info on failure;
  CRLF-tolerant
- adds yaml@^2.8.4 dependency
- 8 unit tests (parser happy/missing/yaml-error/zod-error/empty-stories/CRLF;
  formatIdeaCode pad-3 + overflow)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

__tests__/lib/idea-code.test.ts

@@ -0,0 +1,21 @@
+import { describe, it, expect } from 'vitest'
+
+import { formatIdeaCode } from '@/lib/idea-code'
+
+describe('formatIdeaCode', () => {
+  it('pads to 3 digits', () => {
+    expect(formatIdeaCode(1)).toBe('IDEA-001')
+    expect(formatIdeaCode(42)).toBe('IDEA-042')
+    expect(formatIdeaCode(999)).toBe('IDEA-999')
+  })
+
+  it('does not truncate beyond pad-width', () => {
+    expect(formatIdeaCode(1000)).toBe('IDEA-1000')
+    expect(formatIdeaCode(99999)).toBe('IDEA-99999')
+  })
+})
+
+// Integration-style concurrency-test op nextIdeaCode is in
+// __tests__/integration/ tests die de echte DB raken (zie M12 verificatie-stap).
+// Hier alleen de pure formatter; de increment-logica leunt op Prisma's
+// row-lock in $transaction die we per-database vertrouwen.

__tests__/lib/idea-plan-parser.test.ts

@@ -0,0 +1,103 @@
+import { describe, it, expect } from 'vitest'
+
+import { parsePlanMd } from '@/lib/idea-plan-parser'
+
+const VALID = `---
+pbi:
+  title: Test PBI
+  priority: 2
+stories:
+  - title: Eerste flow
+    priority: 2
+    tasks:
+      - title: Setup
+        priority: 2
+        implementation_plan: |
+          1. Doe X
+          2. Doe Y
+---
+
+# Overwegingen
+
+Dit is de body, niet geparsed.
+`
+
+describe('parsePlanMd', () => {
+  it('parses a valid plan', () => {
+    const r = parsePlanMd(VALID)
+    expect(r.ok).toBe(true)
+    if (r.ok) {
+      expect(r.plan.pbi.title).toBe('Test PBI')
+      expect(r.plan.stories).toHaveLength(1)
+      expect(r.plan.stories[0].tasks).toHaveLength(1)
+      expect(r.plan.stories[0].tasks[0].implementation_plan).toContain('Doe X')
+      expect(r.body).toContain('# Overwegingen')
+    }
+  })
+
+  it('rejects when frontmatter is missing', () => {
+    const r = parsePlanMd('# Just markdown\n\nNo frontmatter here.')
+    expect(r.ok).toBe(false)
+    if (!r.ok) {
+      expect(r.errors[0].line).toBe(1)
+      expect(r.errors[0].message).toMatch(/frontmatter/i)
+    }
+  })
+
+  it('reports yaml syntax error with line info', () => {
+    const broken = `---
+pbi:
+  title: Test
+  priority: [unclosed
+stories:
+  - foo
+---
+
+body
+`
+    const r = parsePlanMd(broken)
+    expect(r.ok).toBe(false)
+    if (!r.ok) {
+      expect(r.errors[0].message.length).toBeGreaterThan(0)
+    }
+  })
+
+  it('reports schema-validation error when pbi-section missing', () => {
+    const noPbi = `---
+stories:
+  - title: x
+    priority: 2
+    tasks:
+      - title: y
+        priority: 2
+---
+
+body
+`
+    const r = parsePlanMd(noPbi)
+    expect(r.ok).toBe(false)
+    if (!r.ok) {
+      expect(r.errors.some((e) => e.message.includes('pbi'))).toBe(true)
+    }
+  })
+
+  it('rejects empty stories array', () => {
+    const noStories = `---
+pbi:
+  title: x
+  priority: 2
+stories: []
+---
+
+body
+`
+    const r = parsePlanMd(noStories)
+    expect(r.ok).toBe(false)
+  })
+
+  it('handles CRLF line endings', () => {
+    const crlf = VALID.replace(/\n/g, '\r\n')
+    const r = parsePlanMd(crlf)
+    expect(r.ok).toBe(true)
+  })
+})

lib/idea-code-server.ts

@@ -0,0 +1,26 @@
+// Atomic per-user idea-code generator (DB-side).
+// Schema: User.idea_code_counter Int @default(0) — increment-and-return via
+// Prisma `update` (which acquires a row-lock for the duration of the
+// transaction; concurrent calls serialize). Format: "IDEA-001", "IDEA-002", …
+//
+// Concurrency: vertrouwt op Postgres row-locking binnen Prisma `update`.
+// Geen aparte $transaction nodig voor enkelvoudige update — de update is
+// atomisch op één rij. Voor combineren met een idea.create wordt
+// nextIdeaCode aangeroepen binnen de bredere $transaction van de caller.
+
+import { prisma } from '@/lib/prisma'
+import { formatIdeaCode } from '@/lib/idea-code'
+
+import type { Prisma } from '@prisma/client'
+
+export async function nextIdeaCode(
+  userId: string,
+  client: Prisma.TransactionClient | typeof prisma = prisma,
+): Promise<string> {
+  const u = await client.user.update({
+    where: { id: userId },
+    data: { idea_code_counter: { increment: 1 } },
+    select: { idea_code_counter: true },
+  })
+  return formatIdeaCode(u.idea_code_counter)
+}

lib/idea-code.ts

@@ -0,0 +1,8 @@
+// Pure helpers voor IDEA-codes. Geen DB-imports — daarom client-safe.
+// De DB-mutating nextIdeaCode staat in lib/idea-code-server.ts.
+
+const PAD = 3 // "IDEA-001". Bumps to 4 digits at counter 1000 organically.
+
+export function formatIdeaCode(n: number): string {
+  return `IDEA-${String(n).padStart(PAD, '0')}`
+}

lib/idea-plan-parser.ts

@@ -0,0 +1,73 @@
+// Parser voor de plan_md die make-plan-job produceert.
+// Format: yaml-frontmatter (structuur, parseerbaar) + markdown-body (vrije
+// reasoning). Frontmatter wordt gevalideerd via ideaPlanMdFrontmatterSchema.
+//
+// Wordt zowel door de server-action materializeIdeaPlanAction als door de
+// MCP-tool update_idea_plan_md gebruikt. Synchroon — geen LLM-call.
+//
+// Zie docs/plans/M12-ideas.md "Plan-md formaat A" voor het format-voorbeeld.
+
+import { parse as parseYaml, YAMLParseError } from 'yaml'
+import {
+  ideaPlanMdFrontmatterSchema,
+  type IdeaPlanFrontmatter,
+} from '@/lib/schemas/idea'
+
+export type PlanParseError = { line?: number; message: string }
+
+export type PlanParseResult =
+  | { ok: true; plan: IdeaPlanFrontmatter; body: string }
+  | { ok: false; errors: PlanParseError[] }
+
+const FRONTMATTER_RE = /^---\r?\n([\s\S]*?)\r?\n---\r?\n?([\s\S]*)$/
+
+export function parsePlanMd(md: string): PlanParseResult {
+  const match = md.match(FRONTMATTER_RE)
+  if (!match) {
+    return {
+      ok: false,
+      errors: [
+        {
+          line: 1,
+          message:
+            'Plan ontbreekt yaml-frontmatter. Verwacht eerste regel: ---',
+        },
+      ],
+    }
+  }
+
+  const [, frontmatterRaw, body] = match
+
+  let parsed: unknown
+  try {
+    parsed = parseYaml(frontmatterRaw)
+  } catch (err) {
+    if (err instanceof YAMLParseError) {
+      return {
+        ok: false,
+        errors: [
+          {
+            line: err.linePos?.[0]?.line,
+            message: err.message,
+          },
+        ],
+      }
+    }
+    return {
+      ok: false,
+      errors: [{ message: err instanceof Error ? err.message : String(err) }],
+    }
+  }
+
+  const validation = ideaPlanMdFrontmatterSchema.safeParse(parsed)
+  if (!validation.success) {
+    return {
+      ok: false,
+      errors: validation.error.issues.map((iss) => ({
+        message: `${iss.path.join('.') || '<root>'}: ${iss.message}`,
+      })),
+    }
+  }
+
+  return { ok: true, plan: validation.data, body: body.trimStart() }
+}

package-lock.json

@@ -42,6 +42,7 @@
         "sonner": "^1.7.4",
         "tailwind-merge": "^3.5.0",
         "tw-animate-css": "^1.4.0",
+        "yaml": "^2.8.4",
         "zod": "^3.25.76",
         "zustand": "^5.0.12"
       },
@@ -21518,10 +21519,9 @@
       "license": "ISC"
     },
     "node_modules/yaml": {
-      "version": "2.8.3",
+      "version": "2.8.4",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.3.tgz",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.4.tgz",
-      "integrity": "sha512-AvbaCLOO2Otw/lW5bmh9d/WEdcDFdQp2Z2ZUH3pX9U2ihyUY0nvLv7J6TrWowklRGPYbB/IuIMfYgxaCPg5Bpg==",
+      "integrity": "sha512-ml/JPOj9fOQK8RNnWojA67GbZ0ApXAUlN2UQclwv2eVgTgn7O9gg9o7paZWKMp4g0H3nTLtS9LVzhkpOFIKzog==",
-      "dev": true,
       "license": "ISC",
       "bin": {
         "yaml": "bin.mjs"

package.json

@@ -55,6 +55,7 @@
     "sonner": "^1.7.4",
     "tailwind-merge": "^3.5.0",
     "tw-animate-css": "^1.4.0",
+    "yaml": "^2.8.4",
     "zod": "^3.25.76",
     "zustand": "^5.0.12"
   },