import { useState } from 'react';
import {
  Alert,
  Badge,
  Button,
  Card,
  FormField,
  Input,
  Spinner,
  useToast,
} from '@cameleer/design-system';
import { useTenantSettings, useChangeOwnPassword, useResetServerAdminPassword } from '../../api/tenant-hooks';
import { tierColor } from '../../utils/tier';
import styles from '../../styles/platform.module.css';

function statusColor(status: string): 'success' | 'error' | 'warning' | 'auto' {
  switch (status?.toUpperCase()) {
    case 'ACTIVE': return 'success';
    case 'SUSPENDED': return 'warning';
    case 'PROVISIONING': return 'auto';
    case 'ERROR': return 'error';
    default: return 'auto';
  }
}

export function SettingsPage() {
  const { data, isLoading, isError } = useTenantSettings();
  const changePassword = useChangeOwnPassword();
  const resetServerAdmin = useResetServerAdminPassword();
  const { toast } = useToast();

  const [newPassword, setNewPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [serverAdminPw, setServerAdminPw] = useState('');

  async function handleChangePassword(e: React.FormEvent) {
    e.preventDefault();
    if (newPassword.length < 8) {
      toast({ title: 'Password must be at least 8 characters', variant: 'error' });
      return;
    }
    if (newPassword !== confirmPassword) {
      toast({ title: 'Passwords do not match', variant: 'error' });
      return;
    }
    try {
      await changePassword.mutateAsync(newPassword);
      toast({ title: 'Password changed successfully', variant: 'success' });
      setNewPassword('');
      setConfirmPassword('');
    } catch (err) {
      toast({ title: 'Failed to change password', description: String(err), variant: 'error' });
    }
  }

  if (isLoading) {
    return (
      <div style={{ display: 'flex', justifyContent: 'center', padding: 64 }}>
        <Spinner />
      </div>
    );
  }

  if (isError || !data) {
    return (
      <div style={{ padding: 24 }}>
        <Alert variant="error" title="Failed to load settings">
          Could not fetch settings. Please refresh.
        </Alert>
      </div>
    );
  }

  return (
    <div style={{ padding: 24, display: 'flex', flexDirection: 'column', gap: 20 }}>
      <h1 style={{ margin: 0, fontSize: '1.25rem', fontWeight: 600 }}>Settings</h1>

      <Card title="Tenant Details">
        <div className={styles.dividerList}>
          <div className={styles.kvRow}>
            <span className={styles.kvLabel}>Name</span>
            <span className={styles.kvValue}>{data.name}</span>
          </div>
          <div className={styles.kvRow}>
            <span className={styles.kvLabel}>Slug</span>
            <span className={styles.kvValueMono}>{data.slug}</span>
          </div>
          <div className={styles.kvRow}>
            <span className={styles.kvLabel}>Tier</span>
            <Badge label={data.tier} color={tierColor(data.tier)} />
          </div>
          <div className={styles.kvRow}>
            <span className={styles.kvLabel}>Status</span>
            <Badge label={data.status} color={statusColor(data.status)} />
          </div>
          <div className={styles.kvRow}>
            <span className={styles.kvLabel}>Server Endpoint</span>
            <span className={styles.kvValueMono}>{data.serverEndpoint ?? '—'}</span>
          </div>
          <div className={styles.kvRow}>
            <span className={styles.kvLabel}>Created</span>
            <span className={styles.kvValue}>{new Date(data.createdAt).toLocaleDateString()}</span>
          </div>
        </div>

        <p className={styles.description} style={{ marginTop: 16 }}>
          To change your tier or other billing-related settings, please contact support.
        </p>
      </Card>

      <Card title="Change Password">
        <p className={styles.description} style={{ marginTop: 0 }}>
          Update your login password. Minimum 8 characters.
        </p>
        <form onSubmit={handleChangePassword} style={{ display: 'flex', flexDirection: 'column', gap: 16, marginTop: 12 }}>
          <FormField label="New password" htmlFor="new-pw">
            <Input
              id="new-pw"
              type="password"
              value={newPassword}
              onChange={(e) => setNewPassword(e.target.value)}
              placeholder="Enter new password"
              required
              minLength={8}
            />
          </FormField>
          <FormField label="Confirm password" htmlFor="confirm-pw">
            <Input
              id="confirm-pw"
              type="password"
              value={confirmPassword}
              onChange={(e) => setConfirmPassword(e.target.value)}
              placeholder="Confirm new password"
              required
              minLength={8}
            />
          </FormField>
          <div>
            <Button type="submit" variant="primary" loading={changePassword.isPending}>
              Change Password
            </Button>
          </div>
        </form>
      </Card>

      <Card title="Server Admin Password">
        <p className={styles.description} style={{ marginTop: 0 }}>
          Reset the built-in admin password for your server dashboard (local login at <code>/login?local</code>).
        </p>
        <form
          onSubmit={async (e) => {
            e.preventDefault();
            if (serverAdminPw.length < 8) {
              toast({ title: 'Password must be at least 8 characters', variant: 'error' });
              return;
            }
            try {
              await resetServerAdmin.mutateAsync(serverAdminPw);
              toast({ title: 'Server admin password reset successfully', variant: 'success' });
              setServerAdminPw('');
            } catch (err) {
              toast({ title: 'Failed to reset server admin password', description: String(err), variant: 'error' });
            }
          }}
          style={{ display: 'flex', flexDirection: 'column', gap: 16, marginTop: 12 }}
        >
          <FormField label="New admin password" htmlFor="server-admin-pw">
            <Input
              id="server-admin-pw"
              type="password"
              value={serverAdminPw}
              onChange={(e) => setServerAdminPw(e.target.value)}
              placeholder="Enter new admin password"
              required
              minLength={8}
            />
          </FormField>
          <div>
            <Button type="submit" variant="primary" loading={resetServerAdmin.isPending}>
              Reset Admin Password
            </Button>
          </div>
        </form>
      </Card>
    </div>
  );
}