// Hardware: what this machine is made of — the board, the processor, the memory modules in
// their slots, the drives and the graphics. None of it moves, so the page is a read rather
// than a monitor: what is live (temperature, usage, SMART) belongs to Dashboard and Disks.
import { useCallback, useEffect, useState } from 'react'
import { api, Hardware as HW, HWBoard, HWDrive, HWGPU, HWModule } from './api'
import { fmtBytes } from './fmt'
import { Btn, Loading } from './ui'

const KIND: Record<string, string> = { nvme: 'NVMe', ssd: 'SSD', hdd: 'HDD', usb: 'USB', emmc: 'eMMC', sd: 'SD', other: 'disk' }
const ghz = (mhz?: number) => (mhz ? `${(mhz / 1000).toFixed(mhz >= 1000 ? 2 : 1)} GHz` : '')

// A row of the "key: value" kind, dropped entirely when there is no value — a machine that
// doesn't report its serial should show one fewer line, not an empty one.
function P({ k, v, mono }: { k: string; v?: string | number | null | false; mono?: boolean }) {
  if (v === undefined || v === null || v === false || v === '' || v === 0) return null
  return <div><span className="k">{k}</span><span className={mono ? 'mono' : undefined} title={String(v)}>{v}</span></div>
}

function Module({ m }: { m: HWModule }) {
  if (m.empty) {
    return (
      <div className="sub-card">
        <div className="sub-head"><span className="dname muted">{m.locator}</span><span className="spacer" /><span className="badge">empty</span></div>
      </div>
    )
  }
  const speed = m.running_mts && m.speed_mts && m.running_mts !== m.speed_mts
    ? `${m.running_mts} MT/s (rated ${m.speed_mts})` // the board is running it slower than it could
    : m.running_mts || m.speed_mts ? `${m.running_mts || m.speed_mts} MT/s` : ''
  return (
    <div className="sub-card">
      <div className="sub-head">
        <span className="dname">{fmtBytes(m.size ?? 0)} {m.type}</span>
        <span className="spacer" />
        <span className="model mono">{m.locator}</span>
      </div>
      <div className="props">
        <P k="Maker" v={m.maker} />
        <P k="Form" v={m.form_factor} />
        <P k="Part" v={m.part} mono />
        <P k="Speed" v={speed} />
        <P k="Rank" v={m.rank ? `${m.rank}R` : ''} />
        <P k="Voltage" v={m.voltage} />
        <P k="Serial" v={m.serial} mono />
      </div>
    </div>
  )
}

function Drive({ d }: { d: HWDrive }) {
  return (
    <div className="sub-card">
      <div className="sub-head">
        <span className="dname">{d.model || d.name}</span>
        <span className="spacer" />
        <span className="badge">{KIND[d.kind] ?? d.kind}</span>
      </div>
      <div className="props">
        <P k="Size" v={fmtBytes(d.size)} />
        <P k="Device" v={`/dev/${d.name}`} mono />
        <P k="Bus" v={d.tran ? d.tran.toUpperCase() : ''} />
        <P k="Spins" v={d.rotational ? 'yes — mechanical' : 'no — solid state'} />
        <P k="Firmware" v={d.firmware} mono />
        <P k="Serial" v={d.serial} mono />
        <P k="Vendor" v={d.vendor} />
      </div>
    </div>
  )
}

function Gpu({ g }: { g: HWGPU }) {
  return (
    <div className="sub-card">
      <div className="sub-head">
        <span className="dname">{g.model}</span>
        <span className="spacer" />
        {g.class && <span className="badge">{g.class}</span>}
      </div>
      <div className="props">
        <P k="Vendor" v={g.vendor} />
        <P k="Driver" v={g.driver} mono />
        <P k="Memory" v={g.memory ? fmtBytes(g.memory) : ''} />
        <P k="Slot" v={g.slot} mono />
        <P k="Node" v={g.node} mono />
      </div>
    </div>
  )
}

// The board and the firmware on it. Everything here is SMBIOS, so a machine without one
// — a Mac, a Pi — gets a card that says as much instead of a column of blanks.
function Motherboard({ b }: { b: HWBoard }) {
  const named = b.maker || b.product || b.bios
  // A board that reports every slot "Available" is not telling us anything — mini PCs
  // copy the slot table out of a reference design and list slots the case has no room
  // for. Only worth showing when the firmware actually tracks what is plugged in.
  const slots = (b.slots ?? []).some((s) => s.usage === 'In Use') ? (b.slots ?? []) : []
  return (
    <section className="card">
      <h2>Motherboard</h2>
      {!named && <div className="empty">This machine has no SMBIOS table, so its firmware doesn't say what board it is.</div>}
      {named && (
        <div className="props">
          <P k="Maker" v={b.maker} />
          <P k="Model" v={b.product} />
          <P k="Version" v={b.version} />
          <P k="Kind" v={b.type} />
          <P k="Chassis" v={[b.chassis_maker, b.chassis].filter(Boolean).join(' ')} />
          <P k="In chassis" v={b.location} />
          <P k="Serial" v={b.serial} mono />
          <P k="Asset tag" v={b.asset_tag} mono />
        </div>
      )}
      {(b.bios || b.bios_date) && (
        <div className="props" style={{ marginTop: 8 }}>
          <P k="Firmware" v={b.bios} />
          <P k="Revision" v={b.bios_revision} />
          <P k="Dated" v={b.bios_date} />
          <P k="ROM" v={b.rom_size} />
          <P k="Boots" v={b.uefi ? 'UEFI' : ''} />
        </div>
      )}
      {slots.length > 0 && (
        <div style={{ marginTop: 8 }}>
          <div className="sub-head"><span className="dname">Expansion slots</span><span className="spacer" /><span className="muted small">as the firmware lists them</span></div>
          <table className="dtable">
            <thead><tr><th>Slot</th><th>Type</th><th>What is in it</th></tr></thead>
            <tbody>{slots.map((s, i) => (
              <tr key={s.designation + i}>
                <td className="mono small">{s.designation}</td>
                <td className="mono small">{[s.type, s.length && s.length !== 'Other' ? s.length.toLowerCase() : ''].filter(Boolean).join(' · ')}</td>
                <td className="small" title={s.bus}>{s.usage === 'In Use' ? (s.device ?? s.bus ?? 'in use') : <span className="muted">{(s.usage ?? '').toLowerCase() || '—'}</span>}</td>
              </tr>
            ))}</tbody>
          </table>
        </div>
      )}
    </section>
  )
}

export default function Hardware() {
  const [hw, setHw] = useState<HW | null>(null)
  const [err, setErr] = useState('')
  const [busy, setBusy] = useState(false)
  const load = useCallback(async (refresh = false) => {
    if (refresh) setBusy(true)
    try { setHw(await api.hardware(refresh)); setErr('') } catch (e) { setErr(e instanceof Error ? e.message : 'failed') } finally { setBusy(false) }
  }, [])
  useEffect(() => { load() }, [load])

  if (err) return <div className="dash"><div className="notice">{err === 'not found' ? "This machine's Ham Lab is older than the Hardware tab. Update it from Machines." : err}</div></div>
  if (!hw) return <div className="dash"><Loading label="Reading the machine…" /></div>

  const { system: sys, board, cpu, memory: mem } = hw
  const drives = hw.drives ?? []
  const gpus = hw.gpus ?? []
  const capacity = drives.reduce((n, d) => n + d.size, 0)
  const threads = cpu.threads ?? 0
  const cores = cpu.cores ?? 0

  return (
    <div className="dash">
      <div className="dash-bar">
        <span className="status"><b>{sys.model || 'this machine'}</b></span>
        {sys.virt && <span className="badge" title="this is a virtual machine, so the parts below are what the host handed it">{sys.virt}</span>}
        <span className="spacer" style={{ flex: 1 }} />
        <Btn className="btn" busy={busy} onClick={() => load(true)}>Re-read</Btn>
      </div>

      <div className="kpis">
        <div className="tile">
          <div className="label">Processor</div>
          <div className="value" title={cpu.model} style={(cpu.model?.length ?? 0) > 20 ? { fontSize: 16 } : undefined}>{cpu.model}</div>
          <div className="sub">{[cores ? `${cores} core${cores === 1 ? '' : 's'}` : '', threads && threads !== cores ? `${threads} threads` : '', cpu.max_mhz ? `up to ${ghz(cpu.max_mhz)}` : ''].filter(Boolean).join(' · ')}</div>
        </div>
        <div className="tile">
          <div className="label">Memory</div>
          <div className="value">{fmtBytes(mem.installed || mem.total)}</div>
          <div className="sub">{mem.slots ? `${mem.filled ?? 0} of ${mem.slots} slot${mem.slots === 1 ? '' : 's'} filled` : 'slots unknown'}{mem.ecc ? ` · ${mem.ecc}` : ''}</div>
        </div>
        <div className="tile">
          <div className="label">Storage</div>
          <div className="value">{fmtBytes(capacity)}</div>
          <div className="sub">{drives.length} drive{drives.length === 1 ? '' : 's'}</div>
        </div>
        <div className="tile">
          <div className="label">Graphics</div>
          <div className="value" title={gpus[0]?.model} style={(gpus[0]?.model?.length ?? 0) > 20 ? { fontSize: 16 } : undefined}>{gpus[0]?.model ?? 'none found'}</div>
          <div className="sub">{gpus.length > 1 ? `${gpus.length} adapters` : gpus[0]?.driver ? `${gpus[0].driver} driver` : ''}</div>
        </div>
      </div>

      {(hw.notes ?? []).map((n, i) => <div className="notice" key={i}>{n}</div>)}

      <div className="cards">
        <section className="card">
          <h2>Processor</h2>
          <div className="props">
            <P k="Model" v={cpu.model} />
            <P k="Vendor" v={cpu.vendor} />
            <P k="Cores" v={cores ? `${cores}${cpu.threads_per_core && cpu.threads_per_core > 1 ? ` · ${cpu.threads_per_core} threads each` : ''}` : ''} />
            <P k="Clock" v={cpu.min_mhz && cpu.max_mhz ? `${ghz(cpu.min_mhz)} – ${ghz(cpu.max_mhz)}` : ghz(cpu.max_mhz)} />
            <P k="Socket" v={(cpu.socket_names ?? []).join(', ')} />
            <P k="Arch" v={cpu.arch} />
            <P k="Family" v={[cpu.family && `family ${cpu.family}`, cpu.model_id && `model ${cpu.model_id}`, cpu.stepping && `stepping ${cpu.stepping}`].filter(Boolean).join(' · ')} />
            <P k="Microcode" v={cpu.microcode} mono />
            <P k="Virt" v={cpu.virtualization} />
          </div>
          {(cpu.caches ?? []).length > 0 && (
            <div className="props" style={{ marginTop: 8 }}>
              {(cpu.caches ?? []).map((c) => <P key={c.level} k={c.level} v={c.size} />)}
            </div>
          )}
          {(cpu.flags ?? []).length > 0 && (
            <div className="chips" style={{ marginTop: 8 }}>{(cpu.flags ?? []).map((f) => <span className="badge" key={f}>{f}</span>)}</div>
          )}
        </section>

        <section className="card">
          <h2>Memory</h2>
          <div className="props">
            <P k="Installed" v={mem.installed ? fmtBytes(mem.installed) : ''} />
            <P k="Usable" v={fmtBytes(mem.total)} />
            <P k="Board takes" v={mem.max_capacity ? fmtBytes(mem.max_capacity) : ''} />
            <P k="ECC" v={mem.ecc} />
          </div>
          <div style={{ marginTop: 8 }}>
            {(mem.modules ?? []).map((m, i) => <Module key={m.locator + i} m={m} />)}
            {(mem.modules ?? []).length === 0 && <div className="empty">The firmware doesn't say what is in the slots.</div>}
          </div>
        </section>

        <section className="card">
          <h2>Drives</h2>
          {drives.map((d) => <Drive key={d.name} d={d} />)}
          {drives.length === 0 && <div className="empty">No drives found.</div>}
        </section>

        <section className="card">
          <h2>Graphics</h2>
          {gpus.map((g, i) => <Gpu key={(g.slot ?? '') + i} g={g} />)}
          {gpus.length === 0 && <div className="empty">No display adapter found.</div>}
        </section>

        <Motherboard b={board} />

        <section className="card">
          <h2>System</h2>
          <div className="props">
            <P k="Model" v={sys.model} />
            <P k="Family" v={sys.family} />
            <P k="Serial" v={sys.serial} mono />
            <P k="Kernel" v={sys.kernel} mono />
            <P k="Arch" v={sys.arch} />
            <P k="Virtual" v={sys.virt} />
          </div>
        </section>
      </div>
    </div>
  )
}