import { HARDWARE } from './data/hardware'
import { SERVICES } from './data/services'
import { UPGRADES } from './data/upgrades'
import type { GameState } from './types'
import {
  buyHardware,
  buyUpgrade,
  canFix,
  canPrestige,
  capacity,
  deployService,
  fixService,
  hardwareCost,
  hostCapacity,
  prestige,
  quirkDef,
  ratePerSec,
  totalRate,
  uninstallService,
} from './engine'
import { save } from './state'
import { toggleHelp } from './help'

// Short codes for the ASCII rack view - kept distinct from data/services.ts
// since they're purely a display concern, not part of a service's identity.
const SERVICE_ABBR: Record<string, string> = {
  nginx: 'NG',
  homepage: 'HP',
  pihole: 'PH',
  wireguard: 'WG',
  gitea: 'GT',
  nextcloud: 'NC',
  vaultwarden: 'VW',
  jellyfin: 'JF',
  uptimekuma: 'UK',
  grafana: 'GF',
  giteaactions: 'GA',
  immich: 'IM',
  synapse: 'MX',
  wastego: 'W8',
}

function fmt(n: number): string {
  if (n < 1000) return n.toFixed(1)
  const units = ['k', 'M', 'B', 'T', 'Q']
  let u = -1
  let v = n
  while (v >= 1000 && u < units.length - 1) {
    v /= 1000
    u++
  }
  return `${v.toFixed(2)}${units[u]}`
}

function timeAgo(t: number): string {
  const d = new Date(t)
  return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' })
}

let selectedHardwareId: string | null = null

// Every host gets a random nickname on purchase (src/data/hostnames.ts),
// which doubles as disambiguation now that multiple hosts can share a tier
// (e.g. two Old Desktops) - no need to number them.
function hostLabel(state: GameState, hardwareId: string): string {
  const hw = state.hardware.find((h) => h.id === hardwareId)
  if (!hw) return 'unknown host'
  const def = HARDWARE.find((h) => h.id === hw.defId)!
  return `${hw.nickname} (${def.name})`
}

export function render(root: HTMLElement, state: GameState, onChange: () => void) {
  const cap = capacity(state)
  const rate = totalRate(state)
  const inOutage = Date.now() < state.outageUntil

  if (!selectedHardwareId || !state.hardware.find((h) => h.id === selectedHardwareId)) {
    selectedHardwareId = state.hardware[0]?.id ?? null
  }

  const prevLogScroll = root.querySelector('.log-list')?.scrollTop

  root.innerHTML = ''
  root.appendChild(buildHeader(state, rate, inOutage))
  root.appendChild(buildRackArt(state))

  const grid = document.createElement('div')
  grid.className = 'grid'
  grid.appendChild(buildLeftColumn(state, cap, onChange))
  grid.appendChild(buildRightColumn(state, onChange))
  root.appendChild(grid)

  if (prevLogScroll !== undefined) {
    const logList = root.querySelector('.log-list')
    if (logList) logList.scrollTop = prevLogScroll
  }

  if (canPrestige(state)) {
    root.appendChild(buildPrestigeBanner(state, onChange))
  }

  save(state)
}

function buildHeader(state: GameState, rate: number, inOutage: boolean): HTMLElement {
  const header = document.createElement('header')
  header.className = 'topbar'
  header.innerHTML = `
    <div class="brand">rack<span class="cursor">_</span></div>
    <div class="stat">
      <span class="arrow">${inOutage ? '✗' : '▲'}</span>
      <span class="rate">${inOutage ? 'OUTAGE' : `${fmt(rate)} pts/sec`}</span>
      <span class="points">${fmt(state.points)} pts</span>
      <button class="help-btn" title="Help & changelog (?)">?</button>
    </div>
  `
  header.querySelector('.help-btn')!.addEventListener('click', () => toggleHelp())
  return header
}

function buildRackArt(state: GameState): HTMLElement {
  const section = document.createElement('section')
  section.className = 'panel rack-art-panel'
  section.innerHTML = `<h2>RACK</h2>`
  const pre = document.createElement('pre')
  pre.className = 'rack-art'

  for (const hw of state.hardware) {
    const hostCap = hostCapacity(state, hw.id)
    const line = document.createElement('div')
    line.className = 'rack-art-line'

    const badges = state.services
      .filter((s) => s.hardwareId === hw.id)
      .map((s) => {
        const abbr = SERVICE_ABBR[s.defId] ?? '??'
        const quirk = quirkDef(s.quirkId)
        const cls = s.status === 'running' ? 'slot-running' : 'slot-crashed'
        return `<span class="${cls}" title="${SERVICES.find((d) => d.id === s.defId)!.name}${quirk ? ` — ${quirk.name}` : ''}">[${abbr}]</span>`
      })
      .join('')

    const freeSlots = Math.max(0, hostCap.ram - hostCap.ramUsed)
    const dots = '·'.repeat(Math.min(freeSlots, 20))

    line.innerHTML = `<span class="rack-host-name">${hw.nickname.padEnd(16, ' ')}</span>${badges}<span class="dim">${dots}</span>`
    pre.appendChild(line)
  }
  section.appendChild(pre)
  return section
}

function buildLeftColumn(state: GameState, cap: ReturnType<typeof capacity>, onChange: () => void): HTMLElement {
  const col = document.createElement('div')
  col.className = 'col left'

  const hwSection = document.createElement('section')
  hwSection.className = 'panel'
  hwSection.innerHTML = `<h2>HARDWARE <span class="dim">Σ ram ${cap.ramUsed}/${cap.ram} · pwr ${cap.powerUsed}/${cap.power}</span></h2>`
  const hwList = document.createElement('div')
  hwList.className = 'list'
  for (const hw of state.hardware) {
    const def = HARDWARE.find((h) => h.id === hw.defId)!
    const hostCap = hostCapacity(state, hw.id)
    const item = document.createElement('div')
    item.className = 'item hardware' + (hw.id === selectedHardwareId ? ' selected' : '')
    item.innerHTML = `<span class="name">${hostLabel(state, hw.id)}</span><span class="dim tiny">ram ${hostCap.ramUsed}/${hostCap.ram} · pwr ${hostCap.powerUsed}/${hostCap.power}</span>`
    item.title = `${def.flavour} (click to select as the deploy target)`
    item.onclick = () => {
      selectedHardwareId = hw.id
      onChange()
    }
    hwList.appendChild(item)
  }
  hwSection.appendChild(hwList)

  // Highest-tier hardware the player already owns - buying another unit of
  // it is a horizontal bridge (more capacity now, at a rising price) for
  // the often-long grind between one tier's cost and the next tier's.
  const topOwnedHw = [...state.hardware]
    .map((h) => HARDWARE.find((d) => d.id === h.defId)!)
    .sort((a, b) => HARDWARE.indexOf(b) - HARDWARE.indexOf(a))[0]
  if (topOwnedHw && topOwnedHw.cost > 0) {
    const repeatCost = hardwareCost(state, topOwnedHw.id)
    const repeatBtn = document.createElement('button')
    repeatBtn.className = 'buy-btn'
    repeatBtn.textContent = `+ buy another ${topOwnedHw.name} (${fmt(repeatCost)})`
    repeatBtn.disabled = state.points < repeatCost
    repeatBtn.title = `Add a second ${topOwnedHw.name} as its own host, at a rising price per extra unit.`
    repeatBtn.onclick = () => {
      if (buyHardware(state, topOwnedHw.id)) onChange()
    }
    hwSection.appendChild(repeatBtn)
  }

  const nextHw = HARDWARE.find((h) => !state.hardware.some((owned) => owned.defId === h.id))
  if (nextHw) {
    const buyBtn = document.createElement('button')
    buyBtn.className = 'buy-btn'
    buyBtn.textContent = `+ buy ${nextHw.name} (${fmt(nextHw.cost)})`
    buyBtn.disabled = state.points < nextHw.cost
    buyBtn.title = nextHw.flavour
    buyBtn.onclick = () => {
      if (buyHardware(state, nextHw.id)) onChange()
    }
    hwSection.appendChild(buyBtn)
  }
  col.appendChild(hwSection)

  const upSection = document.createElement('section')
  upSection.className = 'panel'
  upSection.innerHTML = `<h2>UPGRADES</h2>`
  const upList = document.createElement('div')
  upList.className = 'list'
  for (const up of UPGRADES) {
    const owned = state.upgrades.includes(up.id)
    const lockedByReq = up.requires ? !state.upgrades.includes(up.requires) : false
    const row = document.createElement('div')
    row.className = 'item upgrade' + (owned ? ' owned' : '') + (lockedByReq ? ' locked' : '')
    row.title = up.flavour
    row.innerHTML = `<span class="name">${up.name}</span><span class="upgrade-status">${
      owned ? '✓' : lockedByReq ? '🔒' : fmt(up.cost)
    }</span>`
    if (!owned && !lockedByReq) {
      row.onclick = () => {
        if (buyUpgrade(state, up.id)) onChange()
      }
      row.classList.toggle('affordable', state.points >= up.cost)
    }
    upList.appendChild(row)
  }
  upSection.appendChild(upList)
  col.appendChild(upSection)

  return col
}

function buildRightColumn(state: GameState, onChange: () => void): HTMLElement {
  const col = document.createElement('div')
  col.className = 'col right'

  const svcSection = document.createElement('section')
  svcSection.className = 'panel'
  svcSection.innerHTML = `<h2>SERVICES</h2>`
  const svcList = document.createElement('div')
  svcList.className = 'list'

  const showRates = state.upgrades.includes('monitoring')

  for (const svc of state.services) {
    const def = SERVICES.find((s) => s.id === svc.defId)!
    const row = document.createElement('div')
    row.className = 'item service ' + svc.status
    const rate = ratePerSec(state, svc)
    const badge = svc.redundant ? ' <span class="redundant-badge">×2</span>' : ''
    const quirk = quirkDef(svc.quirkId)
    const quirkBadge = quirk ? ` <span class="quirk-badge" title="${quirk.flavour}">${quirk.name}</span>` : ''
    row.innerHTML = `
      <span class="status-icon">${svc.status === 'running' ? '✓' : '✗'}</span>
      <span class="name">${def.name}${badge}${quirkBadge}</span>
      <span class="dim tiny">${hostLabel(state, svc.hardwareId)}</span>
      <span class="dim">${def.category}</span>
      <span class="value">${svc.status === 'running' ? `${rate.toFixed(1)}/s` : 'CRASHED'}</span>
      ${showRates && svc.status === 'running' ? `<span class="dim tiny">risk ${(def.baseCrashPerSec * 3600).toFixed(2)}/hr</span>` : ''}
    `
    if (svc.status === 'crashed') {
      const fixBtn = document.createElement('button')
      fixBtn.className = 'fix-btn'
      fixBtn.textContent = canFix(svc) ? 'fix' : '...'
      fixBtn.disabled = !canFix(svc)
      fixBtn.onclick = (e) => {
        e.stopPropagation()
        fixService(state, svc.id)
        onChange()
      }
      row.appendChild(fixBtn)
    }
    const uninstallBtn = document.createElement('button')
    uninstallBtn.className = 'uninstall-btn'
    uninstallBtn.textContent = 'rm'
    uninstallBtn.title = `Uninstall ${def.name} (salvage ${Math.round(def.deployCost * 0.25) * (svc.redundant ? 2 : 1)} pts)`
    uninstallBtn.onclick = (e) => {
      e.stopPropagation()
      uninstallService(state, svc.id)
      onChange()
    }
    row.appendChild(uninstallBtn)
    svcList.appendChild(row)
  }
  svcSection.appendChild(svcList)

  const deploySection = document.createElement('div')
  deploySection.className = 'deploy-row'
  const select = document.createElement('select')
  select.className = 'svc-select'
  const targetCap = selectedHardwareId ? hostCapacity(state, selectedHardwareId) : null
  for (const def of SERVICES) {
    const opt = document.createElement('option')
    opt.value = def.id
    opt.textContent = `${def.name} — ${fmt(def.deployCost)}pts · ram ${def.ram} · pwr ${def.power}`
    if (targetCap && (targetCap.ramUsed + def.ram > targetCap.ram || targetCap.powerUsed + def.power > targetCap.power)) {
      opt.textContent += ' (no room on selected host)'
      opt.disabled = true
    }
    select.appendChild(opt)
  }
  const deployBtn = document.createElement('button')
  deployBtn.className = 'buy-btn'
  deployBtn.textContent = '+ deploy service'
  deployBtn.onclick = () => {
    if (!selectedHardwareId) return
    if (deployService(state, select.value, selectedHardwareId)) onChange()
  }
  deploySection.appendChild(select)
  deploySection.appendChild(deployBtn)
  svcSection.appendChild(deploySection)

  col.appendChild(svcSection)

  const logSection = document.createElement('section')
  logSection.className = 'panel log-panel'
  logSection.innerHTML = `<h2>LOG</h2>`
  const logList = document.createElement('div')
  logList.className = 'log-list'
  for (const entry of state.log) {
    const line = document.createElement('div')
    line.className = 'log-line'
    line.innerHTML = `<span class="log-time">${timeAgo(entry.t)}</span> ${entry.text}`
    logList.appendChild(line)
  }
  logSection.appendChild(logList)
  col.appendChild(logSection)

  return col
}

function buildPrestigeBanner(state: GameState, onChange: () => void): HTMLElement {
  const banner = document.createElement('div')
  banner.className = 'prestige-banner'
  banner.innerHTML = `<span>The rack has served its purpose. Decommission it for a permanent multiplier?</span>`
  const btn = document.createElement('button')
  btn.className = 'buy-btn prestige-btn'
  btn.textContent = 'nuke it and start over'
  btn.onclick = () => {
    if (!confirm('This wipes your current hardware and services. The multiplier stays. Proceed?')) return
    const fresh = prestige(state)
    Object.assign(state, fresh)
    onChange()
  }
  banner.appendChild(btn)
  return banner
}