'use client';

import { useState, useEffect } from 'react';
import { Save } from 'lucide-react';

import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { PageHeader } from '@/components/shared/page-header';
import { apiFetch } from '@/lib/api/client';

interface MeUser {
  id?: string;
  email?: string;
  name?: string;
}

export function UserProfile() {
  const [me, setMe] = useState<MeUser | null>(null);
  const [displayName, setDisplayName] = useState('');
  const [savingProfile, setSavingProfile] = useState(false);
  const [profileMessage, setProfileMessage] = useState<{ kind: 'ok' | 'err'; text: string } | null>(
    null,
  );

  const [currentPassword, setCurrentPassword] = useState('');
  const [newPassword, setNewPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [revokeOthers, setRevokeOthers] = useState(true);
  const [savingPassword, setSavingPassword] = useState(false);
  const [passwordMessage, setPasswordMessage] = useState<{
    kind: 'ok' | 'err';
    text: string;
  } | null>(null);

  useEffect(() => {
    async function load() {
      const res = await apiFetch<{ data: { user?: MeUser } }>('/api/v1/me');
      setMe(res.data.user ?? null);
      setDisplayName(res.data.user?.name ?? '');
    }
    void load();
  }, []);

  async function saveProfile() {
    setSavingProfile(true);
    setProfileMessage(null);
    try {
      await apiFetch('/api/v1/me', {
        method: 'PATCH',
        body: { displayName: displayName || undefined },
      });
      setProfileMessage({ kind: 'ok', text: 'Profile saved' });
    } catch (err) {
      setProfileMessage({
        kind: 'err',
        text: err instanceof Error ? err.message : 'Failed to save profile',
      });
    } finally {
      setSavingProfile(false);
    }
  }

  async function changePassword(e: React.FormEvent) {
    e.preventDefault();
    setPasswordMessage(null);
    if (newPassword.length < 9) {
      setPasswordMessage({ kind: 'err', text: 'New password must be at least 9 characters' });
      return;
    }
    if (newPassword !== confirmPassword) {
      setPasswordMessage({ kind: 'err', text: 'New password and confirmation do not match' });
      return;
    }
    setSavingPassword(true);
    try {
      await apiFetch('/api/v1/me/password', {
        method: 'POST',
        body: { currentPassword, newPassword, revokeOtherSessions: revokeOthers },
      });
      setCurrentPassword('');
      setNewPassword('');
      setConfirmPassword('');
      setPasswordMessage({
        kind: 'ok',
        text: revokeOthers
          ? 'Password changed. Other sessions have been signed out.'
          : 'Password changed.',
      });
    } catch (err) {
      setPasswordMessage({
        kind: 'err',
        text: err instanceof Error ? err.message : 'Failed to change password',
      });
    } finally {
      setSavingPassword(false);
    }
  }

  return (
    <div>
      <PageHeader title="Profile" description="Your account details and password" />

      <div className="space-y-6 mt-6">
        <Card>
          <CardHeader>
            <CardTitle>Account</CardTitle>
            <CardDescription>Identity and display preferences for your CRM account</CardDescription>
          </CardHeader>
          <CardContent className="space-y-4">
            <div>
              <Label>Email</Label>
              <Input value={me?.email ?? ''} readOnly className="mt-1" />
              <p className="text-xs text-muted-foreground mt-1">
                Email is your sign-in identifier and cannot be changed here.
              </p>
            </div>
            <div>
              <Label htmlFor="displayName">Display name</Label>
              <Input
                id="displayName"
                value={displayName}
                onChange={(e) => setDisplayName(e.target.value)}
                placeholder="How your name appears in comments, audit log, and emails"
                className="mt-1"
              />
            </div>
            <div className="flex items-center gap-3">
              <Button onClick={saveProfile} disabled={savingProfile} size="sm">
                <Save className="h-3.5 w-3.5 mr-1.5" />
                Save profile
              </Button>
              {profileMessage ? (
                <span
                  className={
                    profileMessage.kind === 'ok' ? 'text-sm text-green-600' : 'text-sm text-red-600'
                  }
                >
                  {profileMessage.text}
                </span>
              ) : null}
            </div>
          </CardContent>
        </Card>

        <Card>
          <CardHeader>
            <CardTitle>Change password</CardTitle>
            <CardDescription>
              Minimum 9 characters. You&rsquo;ll be prompted to sign in again on your other devices
              if you check the box below.
            </CardDescription>
          </CardHeader>
          <CardContent>
            <form onSubmit={changePassword} className="space-y-4 max-w-md">
              <div>
                <Label htmlFor="currentPassword">Current password</Label>
                <Input
                  id="currentPassword"
                  type="password"
                  autoComplete="current-password"
                  required
                  value={currentPassword}
                  onChange={(e) => setCurrentPassword(e.target.value)}
                  className="mt-1"
                />
              </div>
              <div>
                <Label htmlFor="newPassword">New password</Label>
                <Input
                  id="newPassword"
                  type="password"
                  autoComplete="new-password"
                  required
                  minLength={9}
                  value={newPassword}
                  onChange={(e) => setNewPassword(e.target.value)}
                  className="mt-1"
                />
              </div>
              <div>
                <Label htmlFor="confirmPassword">Confirm new password</Label>
                <Input
                  id="confirmPassword"
                  type="password"
                  autoComplete="new-password"
                  required
                  minLength={9}
                  value={confirmPassword}
                  onChange={(e) => setConfirmPassword(e.target.value)}
                  className="mt-1"
                />
              </div>
              <div className="flex items-center gap-2">
                <input
                  id="revokeOthers"
                  type="checkbox"
                  checked={revokeOthers}
                  onChange={(e) => setRevokeOthers(e.target.checked)}
                  className="h-4 w-4"
                />
                <Label htmlFor="revokeOthers" className="text-sm font-normal cursor-pointer">
                  Sign out of other devices
                </Label>
              </div>
              <div className="flex items-center gap-3">
                <Button type="submit" disabled={savingPassword} size="sm">
                  Change password
                </Button>
                {passwordMessage ? (
                  <span
                    className={
                      passwordMessage.kind === 'ok'
                        ? 'text-sm text-green-600'
                        : 'text-sm text-red-600'
                    }
                  >
                    {passwordMessage.text}
                  </span>
                ) : null}
              </div>
            </form>
          </CardContent>
        </Card>
      </div>
    </div>
  );
}
