CUB-131: Build Filament Detail page with usage history

frontend/src/App.tsx

@@ -1,6 +1,7 @@
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import { BrowserRouter, Routes, Route } from 'react-router-dom'
 import InventoryPage from './pages/InventoryPage'
+import FilamentDetailPage from './pages/FilamentDetailPage'
 
 const queryClient = new QueryClient()
 
@@ -16,6 +17,7 @@ export default function App() {
           <main className="p-4">
             <Routes>
               <Route path="/" element={<InventoryPage />} />
+              <Route path="/filament/:id" element={<FilamentDetailPage />} />
             </Routes>
           </main>
         </div>

frontend/src/pages/FilamentDetailPage.tsx

@@ -0,0 +1,391 @@
+import { useState } from 'react'
+import { useParams, useNavigate } from 'react-router-dom'
+import { useQuery, useQueryClient } from '@tanstack/react-query'
+import { ArrowLeft, Pencil, Trash2, AlertTriangle, Loader2, Archive } from 'lucide-react'
+import ColorSwatch from '../components/ColorSwatch'
+import { fetchFilamentById, fetchUsageLogs, deleteFilament } from '../services/filamentService'
+import type { UsageLog } from '../types/filament'
+
+export default function FilamentDetailPage() {
+  const { id } = useParams<{ id: string }>()
+  const spoolId = Number(id)
+  const navigate = useNavigate()
+  const queryClient = useQueryClient()
+  const [deleteConfirm, setDeleteConfirm] = useState(false)
+  const [deleting, setDeleting] = useState(false)
+
+  const {
+    data: spool,
+    isLoading: spoolLoading,
+    error: spoolError,
+    refetch: refetchSpool,
+  } = useQuery({
+    queryKey: ['filament', spoolId],
+    queryFn: () => fetchFilamentById(spoolId),
+    enabled: !isNaN(spoolId),
+  })
+
+  const {
+    data: usageLogs,
+    isLoading: usageLoading,
+    error: usageError,
+    refetch: refetchUsage,
+  } = useQuery({
+    queryKey: ['usage-logs', spoolId],
+    queryFn: () => fetchUsageLogs(spoolId),
+    enabled: !isNaN(spoolId),
+  })
+
+  const handleDelete = async () => {
+    setDeleting(true)
+    try {
+      await deleteFilament(spoolId)
+      queryClient.invalidateQueries({ queryKey: ['filaments'] })
+      navigate('/')
+    } catch {
+      setDeleting(false)
+      setDeleteConfirm(false)
+    }
+  }
+
+  // ── Loading state ──
+  if (spoolLoading) {
+    return (
+      <div className="flex flex-col items-center justify-center py-24 gap-3 text-slate-400">
+        <Loader2 size={32} className="animate-spin text-emerald-400" />
+        <span>Loading spool details…</span>
+      </div>
+    )
+  }
+
+  // ── Error state ──
+  if (spoolError || !spool) {
+    return (
+      <div className="flex flex-col items-center justify-center py-24 gap-4">
+        <div className="flex h-14 w-14 items-center justify-center rounded-full bg-red-900/30">
+          <AlertTriangle size={28} className="text-red-400" />
+        </div>
+        <p className="text-red-400 font-medium">Failed to load spool details.</p>
+        <div className="flex gap-3">
+          <button
+            onClick={() => refetchSpool()}
+            className="rounded-lg bg-slate-700 px-4 py-2 text-sm font-medium text-slate-200 hover:bg-slate-600 transition-colors"
+          >
+            Retry
+          </button>
+          <button
+            onClick={() => navigate('/')}
+            className="rounded-lg bg-slate-800 border border-slate-700 px-4 py-2 text-sm font-medium text-slate-300 hover:bg-slate-700 transition-colors"
+          >
+            Back to Inventory
+          </button>
+        </div>
+      </div>
+    )
+  }
+
+  const pctRemaining = spool.initial_grams > 0
+    ? (spool.remaining_grams / spool.initial_grams) * 100
+    : 0
+  const isLow = spool.remaining_grams <= (spool.low_stock_threshold_grams || 0)
+
+  return (
+    <div className="space-y-6">
+      {/* ── Header Bar ── */}
+      <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
+        <button
+          onClick={() => navigate('/')}
+          className="inline-flex items-center gap-2 rounded-lg bg-slate-800 border border-slate-700 px-3 py-2 text-sm font-medium text-slate-200 hover:bg-slate-700 active:bg-slate-600 transition-colors w-fit"
+        >
+          <ArrowLeft size={16} />
+          Back to Inventory
+        </button>
+
+        <div className="flex items-center gap-2">
+          <button className="inline-flex items-center gap-2 rounded-lg bg-slate-700 px-4 py-2 text-sm font-semibold text-slate-200 hover:bg-slate-600 active:bg-slate-500 transition-colors">
+            <Pencil size={16} />
+            Edit
+          </button>
+          <button
+            onClick={() => setDeleteConfirm(true)}
+            className="inline-flex items-center gap-2 rounded-lg bg-red-900/30 border border-red-700 px-4 py-2 text-sm font-semibold text-red-300 hover:bg-red-900/50 active:bg-red-900/70 transition-colors"
+          >
+            <Trash2 size={16} />
+            Delete
+          </button>
+        </div>
+      </div>
+
+      {/* ── Spool Info Card ── */}
+      <div className="rounded-xl border border-slate-700 bg-slate-800 overflow-hidden">
+        {/* Card header */}
+        <div className="px-6 py-5 border-b border-slate-700 flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
+          <div className="flex items-center gap-3">
+            <ColorSwatch colorHex={spool.color_hex} size={36} />
+            <div>
+              <h1 className="text-xl font-bold text-slate-100">{spool.name}</h1>
+              <p className="text-sm text-slate-400">
+                {spool.brand && <span>{spool.brand} · </span>}
+                {spool.diameter_mm}mm
+              </p>
+            </div>
+          </div>
+          <div>
+            {isLow ? (
+              <span className="inline-flex items-center gap-1.5 rounded-full bg-red-900/40 border border-red-700 px-3 py-1 text-sm font-medium text-red-300">
+                <AlertTriangle size={14} /> Low Stock
+              </span>
+            ) : (
+              <span className="inline-flex items-center gap-1.5 rounded-full bg-emerald-900/30 border border-emerald-700 px-3 py-1 text-sm font-medium text-emerald-300">
+                In Stock
+              </span>
+            )}
+          </div>
+        </div>
+
+        {/* Card body — 2-column grid */}
+        <div className="px-6 py-5 grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-x-8 gap-y-4">
+          <DetailItem label="Material" value={spool.material_base?.name ?? '—'} />
+          <DetailItem label="Finish" value={spool.material_finish?.name ?? '—'} />
+          <DetailItem
+            label="Modifier"
+            value={spool.material_modifier?.name ?? 'None'}
+          />
+          <DetailItem label="Color" value={spool.color_hex.toUpperCase()} />
+          <DetailItem label="Brand" value={spool.brand || '—'} />
+          <DetailItem label="Diameter" value={`${spool.diameter_mm}mm`} />
+          <DetailItem
+            label="Remaining"
+            value={
+              <span className="font-semibold tabular-nums">
+                {spool.remaining_grams.toLocaleString()} g
+              </span>
+            }
+          />
+          <DetailItem
+            label="Initial"
+            value={`${spool.initial_grams.toLocaleString()} g`}
+          />
+          <DetailItem
+            label="Cost"
+            value={
+              spool.cost_usd != null
+                ? `$${spool.cost_usd.toFixed(2)}`
+                : '—'
+            }
+          />
+        </div>
+
+        {/* Progress Bar */}
+        <div className="px-6 pb-5 pt-1">
+          <div className="flex items-center justify-between text-sm mb-1.5">
+            <span className="text-slate-400">
+              <span className="text-slate-200 font-semibold tabular-nums">
+                {spool.remaining_grams.toLocaleString()}g
+              </span>{' '}
+              of {spool.initial_grams.toLocaleString()}g
+            </span>
+            <span className="text-slate-400 font-medium tabular-nums">
+              {pctRemaining.toFixed(1)}%
+            </span>
+          </div>
+          <div className="w-full h-3 rounded-full bg-slate-700 overflow-hidden">
+            <div
+              className={`h-full rounded-full transition-all duration-500 ${
+                pctRemaining <= 10
+                  ? 'bg-red-500'
+                  : pctRemaining <= 25
+                    ? 'bg-amber-500'
+                    : 'bg-emerald-500'
+              }`}
+              style={{ width: `${Math.min(100, pctRemaining)}%` }}
+            />
+          </div>
+        </div>
+      </div>
+
+      {/* ── Usage History ── */}
+      <div className="rounded-xl border border-slate-700 bg-slate-800 overflow-hidden">
+        <div className="px-6 py-4 border-b border-slate-700">
+          <h2 className="text-lg font-semibold text-slate-100">Usage History</h2>
+        </div>
+
+        {/* Loading sub-state */}
+        {usageLoading && (
+          <div className="px-6 py-8 text-center text-slate-400">
+            <Loader2 size={20} className="animate-spin inline mr-2" />
+            Loading usage history…
+          </div>
+        )}
+
+        {/* Usage error sub-state */}
+        {usageError && !usageLoading && (
+          <div className="px-6 py-8 text-center">
+            <p className="text-red-400 text-sm">
+              Failed to load usage history.
+            </p>
+            <button
+              onClick={() => refetchUsage()}
+              className="mt-2 text-sm text-emerald-400 hover:text-emerald-300 underline"
+            >
+              Retry
+            </button>
+          </div>
+        )}
+
+        {/* Empty state */}
+        {!usageLoading && !usageError && usageLogs && usageLogs.length === 0 && (
+          <div className="px-6 py-10 text-center">
+            <Archive size={32} className="mx-auto text-slate-600 mb-2" />
+            <p className="text-slate-400 text-sm">No usage recorded yet.</p>
+            <p className="text-slate-500 text-xs mt-1">
+              Usage data will appear here when this spool is used in print jobs.
+            </p>
+          </div>
+        )}
+
+        {/* Table — desktop */}
+        {!usageLoading && !usageError && usageLogs && usageLogs.length > 0 && (
+          <>
+            <div className="hidden md:block overflow-x-auto">
+              <table className="w-full text-sm">
+                <thead className="bg-slate-800/50 text-slate-300">
+                  <tr>
+                    <th className="px-6 py-3 text-left font-semibold">Date</th>
+                    <th className="px-6 py-3 text-left font-semibold">Print Job</th>
+                    <th className="px-6 py-3 text-right font-semibold">mm Extruded</th>
+                    <th className="px-6 py-3 text-right font-semibold">Grams Used</th>
+                    <th className="px-6 py-3 text-right font-semibold">Cost</th>
+                  </tr>
+                </thead>
+                <tbody className="divide-y divide-slate-700">
+                  {usageLogs.map((log: UsageLog) => (
+                    <tr
+                      key={log.id}
+                      className="hover:bg-slate-700/30 transition-colors"
+                    >
+                      <td className="px-6 py-3 text-slate-200 tabular-nums">
+                        {new Date(log.logged_at).toLocaleDateString('en-US', {
+                          year: 'numeric',
+                          month: 'short',
+                          day: 'numeric',
+                        })}
+                      </td>
+                      <td className="px-6 py-3 text-slate-300">
+                        {log.print_job_name || `Job #${log.print_job_id ?? log.id}`}
+                      </td>
+                      <td className="px-6 py-3 text-right text-slate-200 tabular-nums">
+                        {log.mm_extruded.toLocaleString()}
+                      </td>
+                      <td className="px-6 py-3 text-right text-slate-200 tabular-nums">
+                        {log.grams_used.toFixed(2)} g
+                      </td>
+                      <td className="px-6 py-3 text-right text-slate-200 tabular-nums">
+                        {log.cost_usd != null ? `$${log.cost_usd.toFixed(3)}` : '—'}
+                      </td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
+
+            {/* Mobile cards */}
+            <div className="md:hidden divide-y divide-slate-700">
+              {usageLogs.map((log: UsageLog) => (
+                <div key={log.id} className="px-4 py-4 space-y-2">
+                  <div className="flex items-center justify-between">
+                    <span className="text-sm font-medium text-slate-200">
+                      {log.print_job_name || `Job #${log.print_job_id ?? log.id}`}
+                    </span>
+                    <span className="text-xs text-slate-400 tabular-nums">
+                      {new Date(log.logged_at).toLocaleDateString('en-US', {
+                        month: 'short',
+                        day: 'numeric',
+                      })}
+                    </span>
+                  </div>
+                  <div className="flex items-center justify-between text-sm">
+                    <span className="text-slate-400">
+                      Extruded:{' '}
+                      <span className="text-slate-300 tabular-nums">
+                        {log.mm_extruded.toLocaleString()} mm
+                      </span>
+                    </span>
+                    <span className="text-slate-400">
+                      Used:{' '}
+                      <span className="text-slate-300 tabular-nums">
+                        {log.grams_used.toFixed(2)} g
+                      </span>
+                    </span>
+                    <span className="text-slate-400">
+                      {log.cost_usd != null ? (
+                        <>
+                          Cost:{' '}
+                          <span className="text-slate-300 tabular-nums">
+                            ${log.cost_usd.toFixed(3)}
+                          </span>
+                        </>
+                      ) : (
+                        '—'
+                      )}
+                    </span>
+                  </div>
+                </div>
+              ))}
+            </div>
+          </>
+        )}
+      </div>
+
+      {/* ── Delete Confirmation Modal ── */}
+      {deleteConfirm && (
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm p-4">
+          <div className="w-full max-w-sm rounded-xl bg-slate-800 border border-slate-700 p-6 shadow-2xl space-y-4">
+            <div className="flex items-center gap-3">
+              <div className="flex h-10 w-10 items-center justify-center rounded-full bg-red-900/30 flex-shrink-0">
+                <AlertTriangle size={20} className="text-red-400" />
+              </div>
+              <div>
+                <h3 className="text-lg font-semibold text-slate-100">
+                  Delete &ldquo;{spool.name}&rdquo;?
+                </h3>
+                <p className="text-sm text-slate-400">
+                  This permanently removes the spool and all usage history. This cannot be undone.
+                </p>
+              </div>
+            </div>
+            <div className="flex justify-end gap-3">
+              <button
+                onClick={() => setDeleteConfirm(false)}
+                disabled={deleting}
+                className="rounded-lg bg-slate-700 px-4 py-2 text-sm font-medium text-slate-200 hover:bg-slate-600 transition-colors disabled:opacity-50"
+              >
+                Cancel
+              </button>
+              <button
+                onClick={handleDelete}
+                disabled={deleting}
+                className="inline-flex items-center gap-2 rounded-lg bg-red-600 px-4 py-2 text-sm font-medium text-white hover:bg-red-500 transition-colors disabled:opacity-50"
+              >
+                {deleting && <Loader2 size={16} className="animate-spin" />}
+                {deleting ? 'Deleting…' : 'Delete'}
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}
+
+/** Small detail row for the info card grid */
+function DetailItem({ label, value }: { label: string; value: React.ReactNode }) {
+  return (
+    <div>
+      <dt className="text-xs font-medium uppercase tracking-wider text-slate-500 mb-0.5">
+        {label}
+      </dt>
+      <dd className="text-sm text-slate-200">{value}</dd>
+    </div>
+  )
+}

frontend/src/services/filamentService.ts

@@ -1,5 +1,5 @@
 import axios from 'axios'
-import type { FilamentSpool, ListResponse, FilamentFilter } from '../types/filament'
+import type { FilamentSpool, ListResponse, UsageLog, FilamentFilter } from '../types/filament'
 
 const API_BASE = '/api'
 
@@ -19,6 +19,16 @@ export async function fetchFilaments(filter: FilamentFilter): Promise<ListRespon
   return res.data
 }
 
+export async function fetchFilamentById(id: number): Promise<FilamentSpool> {
+  const res = await axios.get<FilamentSpool>(`${API_BASE}/filaments/${id}`)
+  return res.data
+}
+
+export async function fetchUsageLogs(spoolId: number): Promise<UsageLog[]> {
+  const res = await axios.get<UsageLog[]>(`${API_BASE}/usage-logs?spool_id=${spoolId}`)
+  return res.data
+}
+
 export async function deleteFilament(id: number): Promise<void> {
   await axios.delete(`${API_BASE}/filaments/${id}`)
 }

frontend/src/types/filament.ts

@@ -59,6 +59,19 @@ export interface ListResponse<T> {
   offset: number
 }
 
+export interface UsageLog {
+  id: number
+  spool_id: number
+  print_job_id?: number
+  print_job_name?: string
+  mm_extruded: number
+  grams_used: number
+  cost_usd?: number
+  logged_at: string
+  notes?: string
+  created_at: string
+}
+
 export interface FilamentFilter {
   material?: string
   finish?: string