import { useState } from 'react'
import { NavLink, Outlet, useNavigate } from 'react-router-dom'
import { NAV_GROUPS, STAGES } from '../api/config.js'
import { rolesOf, visibleStages } from '../api/permissions.js'
import { useStageCounts } from '../api/portfolio.jsx'
import { useZino } from '../api/provider.jsx'


/**
 * The frame: a navy bar that stays put, and a drawer behind the hamburger.
 *
 * On a phone the queues cannot live beside the content, and stacked above it
 * they cost a screenful before the first lead. So they go in a drawer, and the
 * bar carries the only two things worth permanent space: where you are, and
 * who you are.
 */

/** Two letters for the avatar: a name if we have one, else the local part. */
function initials(user) {
  const from = user?.name || user?.email || ''
  const parts = from.replace(/@.*$/, '').split(/[\s._-]+/).filter(Boolean)
  if (!parts.length) return '?'
  return (parts[0][0] + (parts[1]?.[0] || '')).toUpperCase()
}

/** The badge colour is the colour of whoever is being waited on. */
function tone(stage) {
  if (stage.kind === 'needs') return 'red'
  if (stage.kind === 'customer') return 'amber'
  return 'grey'
}

/** A queue's icon, chosen for what it is waiting on rather than decoration. */
function NavIcon({ kind }) {
  if (kind === 'needs') {
    return <svg viewBox="0 0 20 20" fill="none"><path d="M6 2.5h5.5L15 6v11.5H6z" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round"/><path d="M11 2.5V6h4" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round"/></svg>
  }
  if (kind === 'customer') {
    return <svg viewBox="0 0 20 20" fill="none"><path d="M3 4.5h14v9h-8l-3.5 3v-3H3z" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round"/></svg>
  }
  if (kind === 'waiting') {
    return <svg viewBox="0 0 20 20" fill="none"><circle cx="10" cy="10" r="7" stroke="currentColor" strokeWidth="1.5"/><path d="M10 6v4.2l2.6 1.6" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/></svg>
  }
  return <svg viewBox="0 0 20 20" fill="none"><path d="M4 10.5 8 14l8-8" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" strokeLinejoin="round"/></svg>
}

export default function Shell() {
  const { user, signOut } = useZino()
  const navigate = useNavigate()
  const roles = rolesOf(user)
  const stages = visibleStages(roles)
  const { counts, ready } = useStageCounts()
  const [open, setOpen] = useState(false)
  const [me, setMe] = useState(false)

  const count = (s) => counts[s.uid] || { total: 0, waiting: 0, working: 0, urgent: 0 }
  const openTotal = STAGES.filter((s) => s.kind !== 'end').reduce((t, s) => t + count(s).total, 0)

  const row = (s) => {
    const c = count(s)
    const n = s.kind === 'end' ? c.total : c.waiting
    const t = tone(s)
    return (
      <NavLink
        key={s.uid} to={`/stage/${s.uid}`} onClick={() => setOpen(false)}
        className={({ isActive }) => 'nav nav--' + (s.kind === 'customer' ? 'teal' : s.kind === 'needs' ? 'red' : 'blue') + (isActive ? ' is-on' : '')}
      >
        <span className="nav__i" aria-hidden="true"><NavIcon kind={s.kind} /></span>
        <span className="nav__t">{s.need ?? s.name}</span>
        {ready ? <span className={`nav__n nav__n--${n ? t : 'grey'}`}>{n}</span> : null}
      </NavLink>
    )
  }

  return (
    <div className="shell">
      <header className="appbar">
        <button type="button" className="appbar__burger" aria-label="Open the menu" onClick={() => setOpen(true)}>
          <svg viewBox="0 0 22 22" fill="none"><path d="M3 6h16M3 11h16M3 16h16" stroke="currentColor" strokeWidth="2" strokeLinecap="round"/></svg>
        </button>
        <div className="appbar__brand">
          <span className="appbar__z" aria-hidden="true">Z</span>
          <span className="appbar__word">ZURICH <span>kotak</span></span>
        </div>
        <button type="button" className="appbar__me" aria-label="Your account" onClick={() => setMe(true)}>
          {initials(user)}
        </button>
      </header>

      <main>
        <Outlet />
      </main>

      {open ? (
        <>
          <div className="scrim" role="presentation" onClick={() => setOpen(false)} />
          <nav className="drawer" aria-label="Queues">
            <div className="drawer__head">
              <button type="button" className="drawer__x" aria-label="Close the menu" onClick={() => setOpen(false)}>
                <svg viewBox="0 0 20 20" fill="none"><path d="M5 5l10 10M15 5L5 15" stroke="currentColor" strokeWidth="1.9" strokeLinecap="round"/></svg>
              </button>
              <span className="appbar__z" aria-hidden="true">Z</span>
              <span className="appbar__word">ZURICH <span>kotak</span></span>
            </div>
            <div className="drawer__body">
              <NavLink to="/" end onClick={() => setOpen(false)} className={({ isActive }) => 'nav' + (isActive ? ' is-on' : '')}>
                <span className="nav__i" aria-hidden="true">
                  <svg viewBox="0 0 20 20" fill="none"><path d="M3.5 3.5h6v6h-6zM10.5 3.5h6v6h-6zM3.5 10.5h6v6h-6zM10.5 10.5h6v6h-6z" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round"/></svg>
                </span>
                <span className="nav__t">Overview</span>
              </NavLink>
              <NavLink to="/stage/all" onClick={() => setOpen(false)} className={({ isActive }) => 'nav' + (isActive ? ' is-on' : '')}>
                <span className="nav__i" aria-hidden="true">
                  <svg viewBox="0 0 20 20" fill="none"><circle cx="7" cy="7" r="2.6" stroke="currentColor" strokeWidth="1.5"/><path d="M2.5 16a4.5 4.5 0 0 1 9 0" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/><path d="M13 5.2a2.6 2.6 0 0 1 0 5M14.5 16a4.4 4.4 0 0 0-2-3.7" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/></svg>
                </span>
                <span className="nav__t">All leads</span>
                {ready ? <span className="nav__n">{openTotal}</span> : null}
              </NavLink>

              {NAV_GROUPS.map((group) => {
                const inGroup = stages.filter((s) => group.kinds.includes(s.kind))
                if (!inGroup.length) return null
                return (
                  <div key={group.label}>
                    <h6 className="drawer__h">{group.label}</h6>
                    {inGroup.map(row)}
                  </div>
                )
              })}
            </div>
          </nav>
        </>
      ) : null}

      {me ? (
        <>
          <div className="scrim" style={{ zIndex: 60 }} role="presentation" onClick={() => setMe(false)} />
          <div className="sheet" role="dialog" aria-label="Your account">
            <span className="sheet__grab" aria-hidden="true" />
            <div className="sheet__head">
              <div>
                <h2>{user?.name || user?.email || 'Signed in'}</h2>
                <p>{user?.email}</p>
              </div>
              <button type="button" className="sheet__x" aria-label="Close" onClick={() => setMe(false)}>×</button>
            </div>
            <div className="sheet__body">
              <button
                type="button" className="btn btn--ghost btn--block"
                onClick={() => { setMe(false); signOut(); navigate('/login') }}
              >
                Sign out
              </button>
            </div>
          </div>
        </>
      ) : null}
    </div>
  )
}