import { useEffect } from 'react';
import { ALLOWED_MODES, defaultStackConfig } from '../../types/provisioning';
import type { ComponentMode, ProvisioningRequest, StackConfig, TenantEnvironment, TenantTier } from '../../types/provisioning';

interface Props {
  signalParent: (state: { isValid: boolean }) => void;
  data: ProvisioningRequest;
  onChange: (updated: Partial<ProvisioningRequest>) => void;
}

const ENVIRONMENTS: { value: TenantEnvironment; label: string; description: string }[] = [
  { value: 'fdev', label: 'Dev (fdev)',   description: 'Feature dev — fast provisioning, no production data.' },
  { value: 'uat',  label: 'UAT',          description: 'User acceptance testing — mirrors production config.' },
  { value: 'prod', label: 'Production',   description: 'Live production. Full isolation enforced.' },
];

const TIERS: { value: TenantTier; label: string; badge: string; description: string }[] = [
  { value: 'Trial',      label: 'Trial',      badge: 'Sandbox',      description: 'Ephemeral all-in-one sandbox. No persistent data guarantee.' },
  { value: 'Shared',     label: 'Shared',     badge: 'Standard',     description: 'Shared platform services, isolated by realm/schema/bucket.' },
  { value: 'Dedicated',  label: 'Dedicated',  badge: 'Professional', description: 'Own sidecar containers per component on the shared host.' },
  { value: 'Enterprise', label: 'Enterprise', badge: 'Enterprise',   description: 'Full VM isolation per component, provisioned via Pulumi.' },
];

const MODE_LABELS: Record<ComponentMode, string> = {
  SharedPlatform: 'Shared Platform',
  Bundled:        'Bundled (in image)',
  OwnContainer:   'Own Container',
  VpsDocker:      'VPS — Docker',
  VpsBareMetal:   'VPS — Bare Metal',
};

const COMPONENTS: { key: keyof StackConfig; label: string; description: string }[] = [
  { key: 'postgres', label: 'PostgreSQL', description: 'Relational database for tenant data.' },
  { key: 'keycloak', label: 'Keycloak',   description: 'Identity & access management (realms, OIDC clients).' },
  { key: 'vault',    label: 'Vault',      description: 'Secrets management and dynamic credentials.' },
  { key: 'minio',    label: 'MinIO',      description: 'Object storage (S3-compatible).' },
];

export default function DeploymentConfigStep({ signalParent, data, onChange }: Props) {
  useEffect(() => {
    signalParent({ isValid: !!data.tier && !!data.environment });
  }, [data.tier, data.environment, signalParent]);

  function handleTierChange(tier: TenantTier) {
    // Reset stackConfig to the default for the new tier so nothing is invalid
    onChange({ tier, stackConfig: defaultStackConfig(tier) });
  }

  function handleComponentChange(key: keyof StackConfig, mode: ComponentMode) {
    onChange({ stackConfig: { ...data.stackConfig, [key]: mode } });
  }

  const allowed = ALLOWED_MODES[data.tier];

  return (
    <div className="wizard-step">
      <p className="step-description">Choose the deployment environment, isolation tier, and per-component infrastructure mode.</p>

      {/* ── Environment ───────────────────────────────────────── */}
      <h4 style={{ marginBottom: '0.5rem' }}>Environment</h4>
      <div className="tier-cards" style={{ marginBottom: '1.5rem' }}>
        {ENVIRONMENTS.map((env) => (
          <button
            key={env.value}
            type="button"
            className={`tier-card${data.environment === env.value ? ' selected' : ''}`}
            onClick={() => onChange({ environment: env.value })}
          >
            <div className="tier-card-header">
              <span className="tier-card-label">{env.label}</span>
            </div>
            <p className="tier-card-description">{env.description}</p>
          </button>
        ))}
      </div>

      {/* ── Isolation Tier ────────────────────────────────────── */}
      <h4 style={{ marginBottom: '0.5rem' }}>Isolation Tier</h4>
      <div className="tier-cards" style={{ marginBottom: '1.5rem' }}>
        {TIERS.map((tier) => (
          <button
            key={tier.value}
            type="button"
            className={`tier-card${data.tier === tier.value ? ' selected' : ''}`}
            onClick={() => handleTierChange(tier.value)}
          >
            <div className="tier-card-header">
              <span className="tier-card-label">{tier.label}</span>
              <span className={`tier-card-badge tier-badge-${tier.value.toLowerCase()}`}>{tier.badge}</span>
            </div>
            <p className="tier-card-description">{tier.description}</p>
          </button>
        ))}
      </div>

      {/* ── Per-Component Stack Config ────────────────────────── */}
      <h4 style={{ marginBottom: '0.25rem' }}>Stack Configuration</h4>
      <p style={{ fontSize: '0.85rem', color: '#5f6b7c', marginBottom: '0.75rem' }}>
        Defaults are set by the tier. Override individual components as needed.
      </p>
      <table className="stack-config-table">
        <thead>
          <tr>
            <th>Component</th>
            <th>Description</th>
            <th>Mode</th>
          </tr>
        </thead>
        <tbody>
          {COMPONENTS.map(({ key, label, description }) => (
            <tr key={key}>
              <td><strong>{label}</strong></td>
              <td style={{ color: '#5f6b7c', fontSize: '0.85rem' }}>{description}</td>
              <td>
                <select
                  className="stack-config-select"
                  value={data.stackConfig[key]}
                  onChange={(e) => handleComponentChange(key, e.target.value as ComponentMode)}
                >
                  {allowed.map((mode) => (
                    <option key={mode} value={mode}>{MODE_LABELS[mode]}</option>
                  ))}
                </select>
              </td>
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}