import type { IConfigFlow, IConfigFlowContext, IConfigFlowStep, IDiscoveryCandidate } from '../../core/types.js';
import type { IIppAttributeRecord, IIppConfig, IIppSnapshot } from './ipp.types.js';
import { ippDefaultBasePath, ippDefaultPort, ippDefaultTimeoutMs } from './ipp.types.js';

export class IppConfigFlow implements IConfigFlow<IIppConfig> {
  public async start(candidateArg: IDiscoveryCandidate, contextArg: IConfigFlowContext): Promise<IConfigFlowStep<IIppConfig>> {
    void contextArg;
    return {
      kind: 'form',
      title: 'Connect IPP printer',
      description: 'Configure the local IPP printer endpoint.',
      fields: [
        { name: 'host', label: 'Host', type: 'text', required: true },
        { name: 'port', label: 'Port', type: 'number' },
        { name: 'basePath', label: 'Relative path to the printer', type: 'text' },
        { name: 'tls', label: 'Use SSL/TLS', type: 'boolean' },
        { name: 'verifySsl', label: 'Verify SSL certificate', type: 'boolean' },
        { name: 'name', label: 'Name', type: 'text' },
      ],
      submit: async (valuesArg) => {
        const metadata = candidateArg.metadata || {};
        const snapshot = snapshotFromMetadata(metadata);
        const attributes = attributesFromMetadata(metadata);
        const host = this.stringValue(valuesArg.host) || candidateArg.host || snapshot?.printer.host || '';
        if (!host && !snapshot && !attributes && !metadata.client) {
          return { kind: 'error', title: 'IPP setup failed', error: 'IPP setup requires a host, snapshot, attributes, or injected client.' };
        }
        const basePath = this.basePathValue(valuesArg.basePath) || this.stringMetadata(metadata, 'basePath') || snapshot?.printer.basePath || ippDefaultBasePath;
        const port = this.numberValue(valuesArg.port) || candidateArg.port || snapshot?.printer.port || ippDefaultPort;
        const tls = this.booleanValue(valuesArg.tls) ?? this.booleanMetadata(metadata, 'tls') ?? snapshot?.printer.tls ?? false;
        const verifySsl = this.booleanValue(valuesArg.verifySsl) ?? this.booleanMetadata(metadata, 'verifySsl') ?? false;
        const uuid = this.stringMetadata(metadata, 'uuid') || snapshot?.printer.uuid;
        const serial = candidateArg.serialNumber || snapshot?.printer.serialNumber;
        return {
          kind: 'done',
          title: 'IPP printer configured',
          config: {
            host,
            port,
            basePath,
            tls,
            verifySsl,
            name: this.stringValue(valuesArg.name) || candidateArg.name || snapshot?.printer.name,
            manufacturer: candidateArg.manufacturer || snapshot?.printer.manufacturer,
            model: candidateArg.model || snapshot?.printer.model,
            uniqueId: candidateArg.id || uuid || serial || (host ? `${host}:${port}${basePath}` : undefined),
            uuid,
            serial,
            timeoutMs: ippDefaultTimeoutMs,
            snapshot,
            attributes,
            client: metadata.client as IIppConfig['client'],
          },
        };
      },
    };
  }

  private stringValue(valueArg: unknown): string | undefined {
    return typeof valueArg === 'string' && valueArg.trim() ? valueArg.trim() : undefined;
  }

  private numberValue(valueArg: unknown): number | undefined {
    if (typeof valueArg === 'number' && Number.isFinite(valueArg) && valueArg > 0) {
      return Math.round(valueArg);
    }
    if (typeof valueArg === 'string' && valueArg.trim()) {
      const parsed = Number(valueArg);
      return Number.isFinite(parsed) && parsed > 0 ? Math.round(parsed) : undefined;
    }
    return undefined;
  }

  private booleanValue(valueArg: unknown): boolean | undefined {
    if (typeof valueArg === 'boolean') {
      return valueArg;
    }
    if (typeof valueArg === 'string') {
      const normalized = valueArg.trim().toLowerCase();
      if (['true', 'yes', 'on', '1'].includes(normalized)) {
        return true;
      }
      if (['false', 'no', 'off', '0'].includes(normalized)) {
        return false;
      }
    }
    return undefined;
  }

  private basePathValue(valueArg: unknown): string | undefined {
    const value = this.stringValue(valueArg);
    if (!value) {
      return undefined;
    }
    return value.startsWith('/') ? value : `/${value}`;
  }

  private stringMetadata(metadataArg: Record<string, unknown>, keyArg: string): string | undefined {
    return this.stringValue(metadataArg[keyArg]);
  }

  private booleanMetadata(metadataArg: Record<string, unknown>, keyArg: string): boolean | undefined {
    const value = metadataArg[keyArg];
    return typeof value === 'boolean' ? value : undefined;
  }
}

const snapshotFromMetadata = (metadataArg: Record<string, unknown>): IIppSnapshot | undefined => {
  const snapshot = metadataArg.snapshot;
  return snapshot && typeof snapshot === 'object' && 'printer' in snapshot && 'status' in snapshot ? snapshot as IIppSnapshot : undefined;
};

const attributesFromMetadata = (metadataArg: Record<string, unknown>): IIppAttributeRecord | undefined => {
  const attributes = metadataArg.attributes;
  return attributes && typeof attributes === 'object' && !Array.isArray(attributes) ? attributes as IIppAttributeRecord : undefined;
};