//
//  JobSearchPipelineTests.swift
//  indeed_ai_job_searchTests
//

import XCTest
@testable import indeed_ai_job_search

final class JobListingFilterTests: XCTestCase {
    func testExcludesUnavailableAndExcludedKeywords() {
        let open = makeListing(key: "a", title: "iOS Developer", snippet: "SwiftUI")
        var closed = makeListing(key: "b", title: "iOS Engineer", snippet: "UIKit")
        closed.availability = .unavailable
        let excluded = makeListing(key: "c", title: "iOS Developer", snippet: "agency contract")

        var criteria = SearchCriteria()
        criteria.jobTitle = "iOS"
        criteria.excludedKeywords = "agency"

        let filtered = JobListingFilter.filter(
            [open, closed, excluded],
            criteria: criteria,
            query: "iOS"
        )

        XCTAssertEqual(filtered.map(\.indeedJobKey), ["a"])
    }

    func testAppliesDateFreshness() {
        let recent = makeListing(
            key: "new",
            title: "Swift Developer",
            postedAt: Date().addingTimeInterval(-86_400)
        )
        let stale = makeListing(
            key: "old",
            title: "Swift Developer",
            postedAt: Date().addingTimeInterval(-86_400 * 40)
        )
        var criteria = SearchCriteria()
        criteria.keywords = "Swift"
        criteria.dateFreshnessDays = 14

        let filtered = JobListingFilter.filter([recent, stale], criteria: criteria, query: "")
        XCTAssertEqual(filtered.map(\.indeedJobKey), ["new"])
    }
}

final class JobListingDeduperTests: XCTestCase {
    func testCollapsesByIndeedJobKeyKeepingNewest() {
        let older = makeListing(
            key: "jk1",
            title: "Old title",
            postedAt: Date().addingTimeInterval(-10_000)
        )
        let newer = makeListing(
            key: "jk1",
            title: "New title",
            postedAt: Date()
        )
        let other = makeListing(key: "jk2", title: "Other")

        let result = JobListingDeduper.dedupe([older, other, newer])
        XCTAssertEqual(result.count, 2)
        XCTAssertEqual(result.first?.title, "New title")
        XCTAssertEqual(result.map(\.indeedJobKey), ["jk1", "jk2"])
    }
}

final class JobRankingApplyOrderTests: XCTestCase {
    func testApplyOrderPreservesOmittedKeys() {
        let a = makeListing(key: "a", title: "A")
        let b = makeListing(key: "b", title: "B")
        let c = makeListing(key: "c", title: "C")
        let ordered = OpenAIJobRankingService.applyOrder(["c", "a"], to: [a, b, c])
        XCTAssertEqual(ordered.map(\.indeedJobKey), ["c", "a", "b"])
    }
}

final class SearchCriteriaMergeTests: XCTestCase {
    func testUserEditsWinOverInterpretation() {
        var interpreted = SearchCriteria()
        interpreted.jobTitle = "Android"
        interpreted.country = "USA"

        var user = SearchCriteria()
        user.country = "" // unset so AI country can apply
        user.jobTitle = "iOS Developer"
        user.remoteTypes = [.remote]

        let merged = SearchCriteriaMerge.merge(interpreted: interpreted, userEdited: user)
        XCTAssertEqual(merged.jobTitle, "iOS Developer")
        XCTAssertEqual(merged.country, "USA")
        XCTAssertEqual(merged.remoteTypes, [.remote])
    }

    func testEmptyUserCountryKeepsAICountry() {
        var interpreted = SearchCriteria()
        interpreted.country = "United Kingdom"

        // No country default — empty user filter must not overwrite AI geo from the query.
        let user = SearchCriteria()
        XCTAssertTrue(user.country.isEmpty)
        let merged = SearchCriteriaMerge.merge(interpreted: interpreted, userEdited: user)
        XCTAssertEqual(merged.country, "United Kingdom")
    }

    func testUserCountryFilterOverridesAI() {
        var interpreted = SearchCriteria()
        interpreted.country = "United Kingdom"

        var user = SearchCriteria()
        user.country = "Pakistan"
        let merged = SearchCriteriaMerge.merge(interpreted: interpreted, userEdited: user)
        XCTAssertEqual(merged.country, "Pakistan")
    }
}

final class IndeedBrowseURLBuilderTests: XCTestCase {
    func testFakeJobKeyUsesBrowseSearchURL() {
        let listing = JobListing(
            indeedJobKey: "fixture-ios-001",
            title: "iOS Developer",
            company: "Acme",
            location: "Lahore, Pakistan",
            remoteType: .remote,
            postedAt: Date(),
            snippet: "Swift",
            indeedURL: URL(string: "https://pk.indeed.com/viewjob?jk=fixture-ios-001")!,
            availability: .open
        )
        let resolved = IndeedBrowseURLBuilder.openableURL(for: listing)
        XCTAssertTrue(resolved.usedBrowseFallback)
        XCTAssertTrue(resolved.url.path.contains("/jobs"))
        XCTAssertEqual(resolved.url.host, "pk.indeed.com")
        XCTAssertFalse(resolved.url.absoluteString.contains("viewjob"))
        // Company must be in `q` so Indeed does not show an unrelated employer.
        let q = URLComponents(url: resolved.url, resolvingAgainstBaseURL: false)?
            .queryItems?
            .first { $0.name == "q" }?
            .value ?? ""
        XCTAssertTrue(q.contains("company:Acme"), "expected company filter in q, got \(q)")
        XCTAssertTrue(q.contains("iOS Developer"))
    }

    func testSearchQueryQuotesMultiWordCompany() {
        let q = IndeedBrowseURLBuilder.searchQuery(title: "iOS Developer", company: "Systems Limited")
        XCTAssertEqual(q, "iOS Developer company:\"Systems Limited\"")
    }

    func testRealHexJobKeyKeepsViewJob() {
        let listing = JobListing(
            indeedJobKey: "5185d0dd8c286093",
            title: "Senior Software Engineer",
            company: "Acme",
            location: "New York, NY",
            remoteType: .remote,
            postedAt: Date(),
            snippet: "Swift",
            indeedURL: URL(string: "https://www.indeed.com/viewjob?jk=5185d0dd8c286093")!,
            availability: .open
        )
        let resolved = IndeedBrowseURLBuilder.openableURL(for: listing)
        XCTAssertFalse(resolved.usedBrowseFallback)
        XCTAssertTrue(resolved.url.absoluteString.contains("viewjob"))
    }
}

final class DefaultJobSearchPipelineTests: XCTestCase {
    func testPipelineFiltersDedupesAndRanks() async throws {
        let duplicateOlder = makeListing(
            key: "dup",
            title: "iOS Developer",
            postedAt: Date().addingTimeInterval(-5_000)
        )
        let duplicateNewer = makeListing(
            key: "dup",
            title: "iOS Developer (Updated)",
            postedAt: Date()
        )
        let android = makeListing(key: "and", title: "Android Developer")

        let source = InlinePipelineDataSource(listings: [duplicateOlder, android, duplicateNewer])
        let pipeline = DefaultJobSearchPipeline(
            interpreter: StaticInterpreter(
                InterpretedSearch(
                    naturalLanguageQuery: "iOS",
                    criteria: {
                        var c = SearchCriteria()
                        c.jobTitle = "iOS"
                        return c
                    }(),
                    confidenceNote: "test"
                )
            ),
            dataSource: source,
            rankingService: HeuristicJobRankingService(),
            validationService: CompositeJobValidationService(
                source: SourceSignalJobValidationService(),
                http: nil
            ),
            cache: NullJobListingCache()
        )

        let previousValidation = FeatureFlags.isListingValidationEnabled
        let previousRanking = FeatureFlags.isAIRankingEnabled
        FeatureFlags.isListingValidationEnabled = true
        FeatureFlags.isAIRankingEnabled = false
        defer {
            FeatureFlags.isListingValidationEnabled = previousValidation
            FeatureFlags.isAIRankingEnabled = previousRanking
        }

        let result = try await pipeline.search(
            JobSearchPipelineRequest(
                naturalLanguageQuery: "iOS jobs",
                userCriteria: SearchCriteria(),
                reinterpret: true
            )
        )

        XCTAssertEqual(result.listings.count, 1)
        XCTAssertEqual(result.listings.first?.indeedJobKey, "dup")
        XCTAssertEqual(result.listings.first?.title, "iOS Developer (Updated)")
        XCTAssertFalse(result.usedCache)
    }

    func testCacheHitSkipsRefetch() async throws {
        let listing = makeListing(key: "cached", title: "iOS Developer")
        let source = InlinePipelineDataSource(listings: [listing])
        let cache = InMemoryIndeedListingCache(ttl: 60)
        let pipeline = DefaultJobSearchPipeline(
            interpreter: StaticInterpreter(
                InterpretedSearch(
                    naturalLanguageQuery: "iOS",
                    criteria: {
                        var c = SearchCriteria()
                        c.keywords = "iOS"
                        return c
                    }(),
                    confidenceNote: "test"
                )
            ),
            dataSource: source,
            rankingService: HeuristicJobRankingService(),
            validationService: CompositeJobValidationService(
                source: SourceSignalJobValidationService(),
                http: nil
            ),
            cache: cache
        )

        let request = JobSearchPipelineRequest(
            naturalLanguageQuery: "iOS",
            userCriteria: SearchCriteria(),
            reinterpret: true
        )
        _ = try await pipeline.search(request)
        let second = try await pipeline.search(request)
        XCTAssertTrue(second.usedCache)
        XCTAssertEqual(source.fetchCount, 1)
    }
}

final class OpenAIModelsTests: XCTestCase {
    func testDefaultModelIsGPT6Luna() {
        XCTAssertEqual(OpenAIModels.defaultChatModel, "gpt-6-luna")
        let client = OpenAIClient(apiKey: "sk-test")
        XCTAssertEqual(client.model, "gpt-6-luna")
        XCTAssertEqual(client.reasoningEffort, "none")
    }
}

// MARK: - Helpers

private func makeListing(
    key: String,
    title: String,
    snippet: String = "Build apps",
    postedAt: Date = Date()
) -> JobListing {
    JobListing(
        indeedJobKey: key,
        title: title,
        company: "Acme",
        location: "Lahore, Pakistan",
        remoteType: .remote,
        employmentType: .fullTime,
        experienceLevel: .mid,
        postedAt: postedAt,
        snippet: snippet,
        indeedURL: URL(string: "https://pk.indeed.com/viewjob?jk=\(key)")!,
        availability: .open
    )
}

private struct StaticInterpreter: OpenAISearchService {
    let value: InterpretedSearch
    init(_ value: InterpretedSearch) { self.value = value }
    func interpret(query: String) async throws -> InterpretedSearch { value }
}

private final class InlinePipelineDataSource: IndeedJobDataSource, @unchecked Sendable {
    let listings: [JobListing]
    private(set) var fetchCount = 0

    init(listings: [JobListing]) {
        self.listings = listings
    }

    func searchPage(
        criteria: SearchCriteria,
        query: String,
        page: IndeedSearchPageRequest
    ) async throws -> IndeedSearchPage {
        fetchCount += 1
        return IndeedSearchPage(
            listings: listings,
            pageIndex: page.pageIndex,
            pageSize: page.pageSize,
            totalEstimated: listings.count,
            nextCursor: nil,
            hasMore: false
        )
    }
}