'use client';

import { useState, useEffect } from 'react';
import { Loader2, AlertCircle, CheckCircle, Info, Pencil } from 'lucide-react';
import { getClubProfile, updateClubProfile } from '@/src/lib/api/courts';
import type { ClubProfile, ClubProfileUpdateRequest} from '@/src/types/courts';
import { COMMON_TIMEZONES, isValidEmail, isValidUrl } from '@/src/types/courts';

/**
 * Editable Field Component - Click to edit with pencil icon
 */
interface EditableFieldProps {
  fieldName: string;
  value: string;
  onChange: (value: string) => void;
  isEditing: boolean;
  onToggleEdit: () => void;
  placeholder?: string;
  maxLength?: number;
  type?: 'text' | 'email' | 'tel' | 'url';
  error?: string;
  disabled?: boolean;
}

function EditableField({
  fieldName,
  value,
  onChange,
  isEditing,
  onToggleEdit,
  placeholder,
  maxLength,
  type = 'text',
  error,
  disabled = false,
}: EditableFieldProps) {
  const hasValue = value.trim().length > 0;

  if (isEditing || !hasValue) {
    return (
      <input
        type={type}
        value={value}
        onChange={(e) => onChange(e.target.value)}
        onBlur={() => hasValue && onToggleEdit()}
        autoFocus
        placeholder={placeholder}
        maxLength={maxLength}
        className={`w-full px-4 py-3 border-2 rounded-lg font-medium transition-colors ${
          error
            ? 'border-red-300 focus:border-red-500'
            : 'border-slate-200 focus:border-slate-900'
        } focus:outline-none`}
        disabled={disabled}
      />
    );
  }

  return (
    <div
      onClick={onToggleEdit}
      className="flex items-center justify-between px-4 py-3 border-2 border-slate-200 rounded-lg cursor-pointer hover:border-slate-300 hover:bg-slate-50 transition-colors group"
    >
      <span className="font-medium text-slate-900">{value}</span>
      <Pencil className="w-4 h-4 text-slate-400 opacity-0 group-hover:opacity-100 transition-opacity" />
    </div>
  );
}

interface ClubProfileTabProps {
  clubId: number;
  onUpdate?: () => void;
}

export default function ClubProfileTab({ clubId, onUpdate }: ClubProfileTabProps) {
  const [profile, setProfile] = useState<ClubProfile | null>(null);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState(false);
  const [errors, setErrors] = useState<Record<string, string>>({});

  // Form state
  const [name, setName] = useState('');
  const [timezone, setTimezone] = useState('');
  const [addressLine1, setAddressLine1] = useState('');
  const [addressLine2, setAddressLine2] = useState('');
  const [city, setCity] = useState('');
  const [postalCode, setPostalCode] = useState('');
  const [country, setCountry] = useState('');
  const [phone, setPhone] = useState('');
  const [email, setEmail] = useState('');
  const [website, setWebsite] = useState('');

  // Edit mode tracking for each field
  const [editingFields, setEditingFields] = useState<Set<string>>(new Set());

  useEffect(() => {
    loadProfile();
  }, [clubId]);

  async function loadProfile() {
    setLoading(true);
    const result = await getClubProfile(clubId);

    if (result.success) {
      const prof = result.data;
      setProfile(prof);

      // Populate form - read from settings structure
      setName(prof.name);
      setTimezone(prof.timezone);
      setAddressLine1(prof.settings?.address?.line_1 || '');
      setAddressLine2(prof.settings?.address?.line_2 || '');
      setCity(prof.settings?.address?.city || '');
      setPostalCode(prof.settings?.address?.postal_code || '');
      setCountry(prof.settings?.address?.country || '');
      setPhone(prof.settings?.contact?.phone || '');
      setEmail(prof.settings?.contact?.email || '');
      setWebsite(prof.settings?.contact?.website || '');

      setError(null);
    } else {
      setError(result.error.detail);
    }

    setLoading(false);
  }

  function validateForm(): boolean {
    const newErrors: Record<string, string> = {};

    if (!name || name.trim().length === 0) {
      newErrors.name = 'Name is required';
    }

    if (!timezone) {
      newErrors.timezone = 'Timezone is required';
    }

    if (email && !isValidEmail(email)) {
      newErrors.email = 'Invalid email format';
    }

    if (website && !isValidUrl(website)) {
      newErrors.website = 'Invalid URL format (must include http:// or https://)';
    }

    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  }

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();

    if (!validateForm()) {
      return;
    }

    setSaving(true);
    setError(null);
    setSuccess(false);

    // Build settings structure, preserving existing settings
    const updatedSettings = {
      ...profile?.settings,
      address: {
        ...profile?.settings?.address,
        line_1: addressLine1.trim() || undefined,
        line_2: addressLine2.trim() || undefined,
        city: city.trim() || undefined,
        postal_code: postalCode.trim() || undefined,
        country: country.trim() || undefined,
      },
      contact: {
        ...profile?.settings?.contact,
        phone: phone.trim() || undefined,
        email: email.trim() || undefined,
        website: website.trim() || undefined,
      },
    };

    const request: ClubProfileUpdateRequest = {
      name: name.trim(),
      timezone,
      settings: updatedSettings,
    };

    const result = await updateClubProfile(clubId, request);

    if (result.success) {
      setProfile(result.data);
      setSuccess(true);
      setError(null);

      // Call parent update callback
      if (onUpdate) {
        onUpdate();
      }

      // Hide success message after 3 seconds
      setTimeout(() => setSuccess(false), 3000);
    } else {
      // Handle validation errors
      if (result.error.code === 'validation_error' && result.error.errors) {
        const fieldErrors: Record<string, string> = {};
        result.error.errors.forEach(err => {
          fieldErrors[err.field] = err.message;
        });
        setErrors(fieldErrors);
      } else {
        setError(result.error.detail);
      }
    }

    setSaving(false);
  }

  function handleCancel() {
    if (!profile) return;

    // Reset form to original values - read from settings structure
    setName(profile.name);
    setTimezone(profile.timezone);
    setAddressLine1(profile.settings?.address?.line_1 || '');
    setAddressLine2(profile.settings?.address?.line_2 || '');
    setCity(profile.settings?.address?.city || '');
    setPostalCode(profile.settings?.address?.postal_code || '');
    setCountry(profile.settings?.address?.country || '');
    setPhone(profile.settings?.contact?.phone || '');
    setEmail(profile.settings?.contact?.email || '');
    setWebsite(profile.settings?.contact?.website || '');
    setErrors({});
    setError(null);
    setEditingFields(new Set());
  }

  function toggleEditField(fieldName: string) {
    setEditingFields(prev => {
      const next = new Set(prev);
      if (next.has(fieldName)) {
        next.delete(fieldName);
      } else {
        next.add(fieldName);
      }
      return next;
    });
  }

  function isFieldEditing(fieldName: string): boolean {
    return editingFields.has(fieldName);
  }

  function hasFieldValue(value: string): boolean {
    return value.trim().length > 0;
  }

  // Loading state
  if (loading) {
    return (
      <div className="flex items-center justify-center py-20">
        <Loader2 className="w-8 h-8 text-slate-600 animate-spin" />
      </div>
    );
  }

  // Error state
  if (error && !profile) {
    return (
      <div className="bg-red-50 border-2 border-red-200 rounded-2xl p-6">
        <div className="flex items-start space-x-3">
          <AlertCircle className="w-5 h-5 text-red-600 flex-shrink-0 mt-0.5" />
          <p className="text-red-700">{error}</p>
        </div>
      </div>
    );
  }

  if (!profile) return null;

  return (
    <div className="max-w-4xl">
      {/* Success message */}
      {success && (
        <div className="mb-6 bg-green-50 border-2 border-green-200 rounded-2xl p-6">
          <div className="flex items-center space-x-3">
            <CheckCircle className="w-5 h-5 text-green-600" />
            <p className="text-green-700 font-medium">Profile updated successfully</p>
          </div>
        </div>
      )}

      {/* Error message */}
      {error && (
        <div className="mb-6 bg-red-50 border-2 border-red-200 rounded-2xl p-6">
          <div className="flex items-start space-x-3">
            <AlertCircle className="w-5 h-5 text-red-600 flex-shrink-0 mt-0.5" />
            <p className="text-red-700">{error}</p>
          </div>
        </div>
      )}

      <form onSubmit={handleSubmit} className="space-y-8">
        {/* Basic Information */}
        <section className="bg-white border-2 border-slate-200 rounded-2xl p-6">
          <h3 className="text-xl font-bold text-slate-900 mb-6">Basic Information</h3>

          <div className="space-y-4">
            {/* Name */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Name <span className="text-red-600">*</span>
              </label>
              {isFieldEditing('name') || !hasFieldValue(name) ? (
                <input
                  type="text"
                  value={name}
                  onChange={(e) => setName(e.target.value)}
                  onBlur={() => hasFieldValue(name) && toggleEditField('name')}
                  autoFocus
                  className={`w-full px-4 py-3 border-2 rounded-lg font-medium transition-colors ${
                    errors.name
                      ? 'border-red-300 focus:border-red-500'
                      : 'border-slate-200 focus:border-slate-900'
                  } focus:outline-none`}
                  disabled={saving}
                />
              ) : (
                <div
                  onClick={() => toggleEditField('name')}
                  className="flex items-center justify-between px-4 py-3 border-2 border-slate-200 rounded-lg cursor-pointer hover:border-slate-300 hover:bg-slate-50 transition-colors group"
                >
                  <span className="font-medium text-slate-900">{name}</span>
                  <Pencil className="w-4 h-4 text-slate-400 opacity-0 group-hover:opacity-100 transition-opacity" />
                </div>
              )}
              {errors.name && (
                <p className="mt-1 text-sm text-red-600">{errors.name}</p>
              )}
            </div>

            {/* Timezone */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Timezone <span className="text-red-600">*</span>
              </label>
              {isFieldEditing('timezone') ? (
                <select
                  value={timezone}
                  onChange={(e) => setTimezone(e.target.value)}
                  onBlur={() => toggleEditField('timezone')}
                  autoFocus
                  className={`w-full px-4 py-3 border-2 rounded-lg font-medium transition-colors ${
                    errors.timezone
                      ? 'border-red-300 focus:border-red-500'
                      : 'border-slate-200 focus:border-slate-900'
                  } focus:outline-none`}
                  disabled={saving}
                >
                  {COMMON_TIMEZONES.map((tz) => (
                    <option key={tz.value} value={tz.value}>
                      {tz.label}
                    </option>
                  ))}
                </select>
              ) : (
                <div
                  onClick={() => toggleEditField('timezone')}
                  className="flex items-center justify-between px-4 py-3 border-2 border-slate-200 rounded-lg cursor-pointer hover:border-slate-300 hover:bg-slate-50 transition-colors group"
                >
                  <span className="font-medium text-slate-900">
                    {COMMON_TIMEZONES.find(tz => tz.value === timezone)?.label || timezone}
                  </span>
                  <Pencil className="w-4 h-4 text-slate-400 opacity-0 group-hover:opacity-100 transition-opacity" />
                </div>
              )}
              {errors.timezone && (
                <p className="mt-1 text-sm text-red-600">{errors.timezone}</p>
              )}
            </div>
          </div>
        </section>

        {/* Location */}
        <section className="bg-white border-2 border-slate-200 rounded-2xl p-6">
          <div className="flex items-start justify-between mb-6">
            <h3 className="text-xl font-bold text-slate-900">Location</h3>
            <div className="group relative">
              <Info className="w-5 h-5 text-slate-400 cursor-help" />
              <div className="absolute right-0 top-6 w-64 p-3 bg-slate-900 text-white text-sm rounded-lg opacity-0 invisible group-hover:opacity-100 group-hover:visible transition-all z-10">
                Stored in settings until native fields ship
              </div>
            </div>
          </div>

          <div className="space-y-4">
            {/* Address Line 1 */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Address Line 1
              </label>
              <EditableField
                fieldName="addressLine1"
                value={addressLine1}
                onChange={setAddressLine1}
                isEditing={isFieldEditing('addressLine1')}
                onToggleEdit={() => toggleEditField('addressLine1')}
                placeholder="123 High Street"
                maxLength={200}
                disabled={saving}
              />
            </div>

            {/* Address Line 2 */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Address Line 2
              </label>
              <EditableField
                fieldName="addressLine2"
                value={addressLine2}
                onChange={setAddressLine2}
                isEditing={isFieldEditing('addressLine2')}
                onToggleEdit={() => toggleEditField('addressLine2')}
                placeholder="Building A"
                maxLength={200}
                disabled={saving}
              />
            </div>

            {/* City & Postal Code */}
            <div className="grid grid-cols-2 gap-4">
              <div>
                <label className="block text-sm font-semibold text-slate-900 mb-2">
                  City
                </label>
                <EditableField
                  fieldName="city"
                  value={city}
                  onChange={setCity}
                  isEditing={isFieldEditing('city')}
                  onToggleEdit={() => toggleEditField('city')}
                  placeholder="London"
                  maxLength={100}
                  disabled={saving}
                />
              </div>

              <div>
                <label className="block text-sm font-semibold text-slate-900 mb-2">
                  Postal Code
                </label>
                <EditableField
                  fieldName="postalCode"
                  value={postalCode}
                  onChange={setPostalCode}
                  isEditing={isFieldEditing('postalCode')}
                  onToggleEdit={() => toggleEditField('postalCode')}
                  placeholder="SW1A 1AA"
                  maxLength={20}
                  disabled={saving}
                />
              </div>
            </div>

            {/* Country */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Country
              </label>
              <EditableField
                fieldName="country"
                value={country}
                onChange={setCountry}
                isEditing={isFieldEditing('country')}
                onToggleEdit={() => toggleEditField('country')}
                placeholder="United Kingdom"
                maxLength={100}
                disabled={saving}
              />
            </div>
          </div>
        </section>

        {/* Contact */}
        <section className="bg-white border-2 border-slate-200 rounded-2xl p-6">
          <div className="flex items-start justify-between mb-6">
            <h3 className="text-xl font-bold text-slate-900">Contact</h3>
            <div className="group relative">
              <Info className="w-5 h-5 text-slate-400 cursor-help" />
              <div className="absolute right-0 top-6 w-64 p-3 bg-slate-900 text-white text-sm rounded-lg opacity-0 invisible group-hover:opacity-100 group-hover:visible transition-all z-10">
                Stored in settings until native fields ship
              </div>
            </div>
          </div>

          <div className="space-y-4">
            {/* Phone */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Phone
              </label>
              <EditableField
                fieldName="phone"
                value={phone}
                onChange={setPhone}
                isEditing={isFieldEditing('phone')}
                onToggleEdit={() => toggleEditField('phone')}
                placeholder="+44 20 1234 5678"
                maxLength={50}
                type="tel"
                disabled={saving}
              />
            </div>

            {/* Email */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Email
              </label>
              <EditableField
                fieldName="email"
                value={email}
                onChange={setEmail}
                isEditing={isFieldEditing('email')}
                onToggleEdit={() => toggleEditField('email')}
                placeholder="info@centralpadel.com"
                maxLength={100}
                type="email"
                error={errors.email}
                disabled={saving}
              />
              {errors.email && (
                <p className="mt-1 text-sm text-red-600">{errors.email}</p>
              )}
            </div>

            {/* Website */}
            <div>
              <label className="block text-sm font-semibold text-slate-900 mb-2">
                Website
              </label>
              <EditableField
                fieldName="website"
                value={website}
                onChange={setWebsite}
                isEditing={isFieldEditing('website')}
                onToggleEdit={() => toggleEditField('website')}
                placeholder="https://www.centralpadel.com"
                maxLength={200}
                type="url"
                error={errors.website}
                disabled={saving}
              />
              {errors.website && (
                <p className="mt-1 text-sm text-red-600">{errors.website}</p>
              )}
            </div>
          </div>
        </section>

        {/* Actions */}
        <div className="flex items-center justify-end space-x-3 pt-4">
          <button
            type="button"
            onClick={handleCancel}
            className="px-6 py-3 text-slate-700 font-semibold rounded-lg hover:bg-slate-100 transition-colors"
            disabled={saving}
          >
            Cancel
          </button>
          <button
            type="submit"
            className="inline-flex items-center px-6 py-3 bg-slate-900 text-white font-semibold rounded-lg hover:bg-slate-800 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
            disabled={saving}
          >
            {saving && <Loader2 className="w-4 h-4 mr-2 animate-spin" />}
            Save Changes
          </button>
        </div>
      </form>
    </div>
  );
}