indeed_ai_job_search/indeed_ai_job_search/Services/Indeed/FallbackIndeedJobDataSource.swift

//
//  FallbackIndeedJobDataSource.swift
//  indeed_ai_job_search
//
//  Tries the primary Indeed source first; if it succeeds with zero listings
//  (or fails with a soft network/parse error), uses the fallback source.
//

import Foundation
import OSLog

struct FallbackIndeedJobDataSource: IndeedJobDataSource {
    private static let log = Logger(
        subsystem: Bundle.main.bundleIdentifier ?? "indeed_ai_job_search",
        category: "IndeedFallback"
    )

    var primary: any IndeedJobDataSource
    var fallback: any IndeedJobDataSource

    func searchPage(
        criteria: SearchCriteria,
        query: String,
        page: IndeedSearchPageRequest
    ) async throws -> IndeedSearchPage {
        do {
            let primaryPage = try await primary.searchPage(
                criteria: criteria,
                query: query,
                page: page
            )
            if !primaryPage.listings.isEmpty || page.pageIndex > 0 {
                return primaryPage
            }
            Self.log.warning("Primary Indeed source returned 0 listings — trying fallback")
        } catch {
            Self.log.warning(
                "Primary Indeed source failed (\(error.localizedDescription, privacy: .public)) — trying fallback"
            )
        }

        return try await fallback.searchPage(
            criteria: criteria,
            query: query,
            page: page
        )
    }
}