import type { ComponentRegistry } from "../registry.js";

interface ValidateInput { component: string; schema?: string; props?: Record<string, unknown>; parts?: string[]; }
interface ValidateResult { valid: boolean; errors: string[]; }

interface ZodParseIssue { message: string; path: (string | number)[]; }
interface ZodParseError { issues: ZodParseIssue[]; }
interface ZodParseResult { success: boolean; error?: ZodParseError; }
interface ZodSchema { safeParse(data: unknown): ZodParseResult; }

/** Validates props against schema and/or checks required parts are present. */
export function handleValidate(registry: ComponentRegistry, input: ValidateInput): ValidateResult {
  const comp = registry.getComponent(input.component);
  if (!comp) return { valid: false, errors: [`Component "${input.component}" not found`] };

  const errors: string[] = [];

  // Validate props against named schema
  if (input.props !== undefined && input.schema) {
    const schema = comp.schemas[input.schema];
    if (!schema) {
      errors.push(`Schema "${input.schema}" not found on ${comp.meta.name}`);
    } else {
      const zSchema = schema as ZodSchema;
      const result = zSchema.safeParse(input.props);
      if (!result.success && result.error) {
        for (const issue of result.error.issues) {
          const pathStr = issue.path.length > 0 ? ` at "${issue.path.join(".")}"` : "";
          errors.push(`${issue.message}${pathStr}`);
        }
      }
    }
  }

  // Check required parts
  if (input.parts !== undefined) {
    for (const required of comp.meta.requiredParts) {
      if (!input.parts.includes(required)) {
        errors.push(`Missing required part: ${required}`);
      }
    }
  }

  return { valid: errors.length === 0, errors };
}