import { useState, useEffect } from 'react'
import { useAlert } from '../context/AlertContext'
import { useAuth } from '../context/AuthContext'
import Forbidden from '../components/Forbidden'
import { useNavigate, Link } from 'react-router-dom'
import { motion } from 'framer-motion'

import AdminDatePicker from '../components/AdminDatePicker'
import FormField from '../components/FormField'
import apiFetch from '../utils/api'
const API_BASE = '/api/admin'

interface User {
  id: number | string
  name: string
}

interface CreateForm {
  user_id: string
  shift_date: string
  leave_type: string
  leave_hours: number
  arrival_date: string
  arrival_time: string
  break_start_date: string
  break_start_time: string
  break_end_date: string
  break_end_time: string
  departure_date: string
  departure_time: string
  notes: string
}

export default function AttendanceCreate() {
  const alert = useAlert()
  const { hasPermission } = useAuth()
  const navigate = useNavigate()
  const [loading, setLoading] = useState(true)
  const [submitting, setSubmitting] = useState(false)
  const [users, setUsers] = useState<User[]>([])

  const today = new Date().toISOString().split('T')[0]

  const [form, setForm] = useState<CreateForm>({
    user_id: '',
    shift_date: today,
    leave_type: 'work',
    leave_hours: 8,
    arrival_date: today,
    arrival_time: '',
    break_start_date: today,
    break_start_time: '',
    break_end_date: today,
    break_end_time: '',
    departure_date: today,
    departure_time: '',
    notes: ''
  })

  useEffect(() => {
    const fetchUsers = async () => {
      try {
        const response = await apiFetch(`${API_BASE}/users`)
        const result = await response.json()
        if (result.success) {
          setUsers(Array.isArray(result.data) ? result.data : result.data?.items || [])
        }
      } catch {
        alert.error('Nepodařilo se načíst uživatele')
      } finally {
        setLoading(false)
      }
    }

    fetchUsers()
  }, [alert])

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()

    if (!form.user_id || !form.shift_date) {
      alert.error('Vyplňte zaměstnance a datum směny')
      return
    }

    setSubmitting(true)

    try {
      const response = await apiFetch(`${API_BASE}/attendance`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(form)
      })

      const result = await response.json()

      if (result.success) {
        alert.success(result.message)
        navigate(`/attendance/admin?month=${form.shift_date.substring(0, 7)}`)
      } else {
        alert.error(result.error)
      }
    } catch {
      alert.error('Chyba připojení')
    } finally {
      setSubmitting(false)
    }
  }

  const handleShiftDateChange = (newDate: string) => {
    setForm({
      ...form,
      shift_date: newDate,
      arrival_date: newDate,
      break_start_date: newDate,
      break_end_date: newDate,
      departure_date: newDate
    })
  }

  const isWorkType = form.leave_type === 'work'

  if (!hasPermission('attendance.admin')) return <Forbidden />

  if (loading) {
    return (
      <div className="admin-skeleton" style={{ padding: 0, gap: '1.5rem' }}>
        <div className="admin-skeleton-row" style={{ justifyContent: 'space-between' }}>
          <div className="admin-skeleton-line h-8" style={{ width: '200px' }} />
        </div>
        <div className="admin-card" style={{ maxWidth: '600px' }}>
          <div className="admin-skeleton" style={{ gap: '1.25rem' }}>
            {[0, 1, 2, 3, 4].map(i => (
              <div key={i}>
                <div className="admin-skeleton-line w-1/4" style={{ marginBottom: '0.5rem', height: '10px' }} />
                <div className="admin-skeleton-line w-full h-10" />
              </div>
            ))}
            <div className="admin-skeleton-line h-10" style={{ width: '120px', borderRadius: '8px' }} />
          </div>
        </div>
      </div>
    )
  }

  return (
    <div>
      <motion.div
        className="admin-page-header"
        initial={{ opacity: 0, y: 12 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ duration: 0.25 }}
      >
        <div>
          <h1 className="admin-page-title">Přidat záznam docházky</h1>
        </div>
        <div className="admin-page-actions">
          <Link to="/attendance/admin" className="admin-btn admin-btn-secondary">
            &larr; Zpět na správu
          </Link>
        </div>
      </motion.div>

      <motion.div
        className="admin-card"
        style={{ maxWidth: '600px' }}
        initial={{ opacity: 0, y: 12 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ duration: 0.25, delay: 0.06 }}
      >
        <div className="admin-card-body">
          <form onSubmit={handleSubmit} className="admin-form">
            <div className="admin-form-row">
              <FormField label="Zaměstnanec" required>
                <select
                  value={form.user_id}
                  onChange={(e) => setForm({ ...form, user_id: e.target.value })}
                  className="admin-form-select"
                  required
                >
                  <option value="">Vyberte zaměstnance</option>
                  {users.map((user) => (
                    <option key={user.id} value={user.id}>{user.name}</option>
                  ))}
                </select>
              </FormField>
              <FormField label="Datum směny" required>
                <AdminDatePicker
                  mode="date"
                  value={form.shift_date}
                  onChange={(val: string) => handleShiftDateChange(val)}
                  required
                />
              </FormField>
            </div>

            <FormField label="Typ záznamu" required>
              <select
                value={form.leave_type}
                onChange={(e) => setForm({ ...form, leave_type: e.target.value })}
                className="admin-form-select"
              >
                <option value="work">Práce</option>
                <option value="vacation">Dovolená</option>
                <option value="sick">Nemoc</option>
                <option value="holiday">Svátek</option>
                <option value="unpaid">Neplacené volno</option>
              </select>
            </FormField>

            {!isWorkType && (
              <FormField label="Počet hodin">
                <input
                  type="number"
                  value={form.leave_hours}
                  onChange={(e) => setForm({ ...form, leave_hours: parseFloat(e.target.value) })}
                  min="0.5"
                  max="24"
                  step="0.5"
                  className="admin-form-input"
                />
                <small className="admin-form-hint">Výchozí 8 hodin pro celý den</small>
              </FormField>
            )}

            {isWorkType && (
              <>
                <div className="admin-form-row">
                  <FormField label="Příchod - datum">
                    <AdminDatePicker
                      mode="date"
                      value={form.arrival_date}
                      onChange={(val: string) => setForm({ ...form, arrival_date: val })}
                    />
                  </FormField>
                  <FormField label="Příchod - čas">
                    <AdminDatePicker
                      mode="time"
                      value={form.arrival_time}
                      onChange={(val: string) => setForm({ ...form, arrival_time: val })}
                    />
                  </FormField>
                </div>

                <div className="admin-form-row">
                  <FormField label="Začátek pauzy - datum">
                    <AdminDatePicker
                      mode="date"
                      value={form.break_start_date}
                      onChange={(val: string) => setForm({ ...form, break_start_date: val })}
                    />
                  </FormField>
                  <FormField label="Začátek pauzy - čas">
                    <AdminDatePicker
                      mode="time"
                      value={form.break_start_time}
                      onChange={(val: string) => setForm({ ...form, break_start_time: val })}
                    />
                  </FormField>
                </div>

                <div className="admin-form-row">
                  <FormField label="Konec pauzy - datum">
                    <AdminDatePicker
                      mode="date"
                      value={form.break_end_date}
                      onChange={(val: string) => setForm({ ...form, break_end_date: val })}
                    />
                  </FormField>
                  <FormField label="Konec pauzy - čas">
                    <AdminDatePicker
                      mode="time"
                      value={form.break_end_time}
                      onChange={(val: string) => setForm({ ...form, break_end_time: val })}
                    />
                  </FormField>
                </div>

                <div className="admin-form-row">
                  <FormField label="Odchod - datum">
                    <AdminDatePicker
                      mode="date"
                      value={form.departure_date}
                      onChange={(val: string) => setForm({ ...form, departure_date: val })}
                    />
                  </FormField>
                  <FormField label="Odchod - čas">
                    <AdminDatePicker
                      mode="time"
                      value={form.departure_time}
                      onChange={(val: string) => setForm({ ...form, departure_time: val })}
                    />
                  </FormField>
                </div>
              </>
            )}

            <FormField label="Poznámka">
              <textarea
                value={form.notes}
                onChange={(e) => setForm({ ...form, notes: e.target.value })}
                className="admin-form-textarea"
                rows={3}
              />
            </FormField>

            <div className="admin-form-actions">
              <Link to="/attendance/admin" className="admin-btn admin-btn-secondary">
                Zrušit
              </Link>
              <button
                type="submit"
                disabled={submitting}
                className="admin-btn admin-btn-primary"
              >
                {submitting ? 'Ukládám...' : 'Uložit'}
              </button>
            </div>
          </form>
        </div>
      </motion.div>
    </div>
  )
}