//
//  IndeedListingMapperTests.swift
//  indeed_ai_job_searchTests
//

import XCTest
@testable import indeed_ai_job_search

private let searchPage0JSON = """
{
  "pageIndex": 0,
  "pageSize": 25,
  "totalEstimated": 3,
  "nextCursor": "page-1",
  "hasMore": true,
  "results": [
    {
      "jobKey": "fixture-ios-lahore-001",
      "title": "iOS Developer",
      "company": "Nexlify Studio",
      "location": "Lahore, Pakistan",
      "remoteType": "hybrid",
      "employmentType": "full-time",
      "experienceLevel": "mid",
      "salaryMin": 1800000,
      "salaryMax": 2800000,
      "salaryCurrency": "PKR",
      "salaryPeriod": "year",
      "postedAt": "2026-10-08T09:30:00Z",
      "snippet": "Build SwiftUI features for a consumer productivity app.",
      "url": "https://pk.indeed.com/jobs?q=iOS+Developer&l=Lahore%2C+Pakistan",
      "availability": "open",
      "isEasyApply": true
    },
    {
      "jobKey": "fixture-swift-remote-002",
      "title": "Senior Swift Engineer",
      "company": "Alpine Cloud",
      "location": "Remote, Pakistan",
      "remoteType": "remote",
      "employmentType": "full-time",
      "experienceLevel": "senior",
      "salaryMin": 90000,
      "salaryMax": 130000,
      "salaryCurrency": "USD",
      "salaryPeriod": "year",
      "postedAt": "2026-10-10T14:00:00Z",
      "snippet": "Own macOS and iOS modules.",
      "url": "https://www.indeed.com/jobs?q=Senior+Swift+Engineer&l=Remote",
      "availability": "open"
    },
    {
      "title": "Android Developer",
      "company": "Karachi Labs",
      "location": "Karachi, Pakistan",
      "remoteType": "onsite",
      "url": "https://pk.indeed.com/jobs?q=Android+Developer&l=Karachi%2C+Pakistan",
      "availability": "unknown",
      "snippet": "Kotlin multiplatform experiments."
    }
  ]
}
"""

final class IndeedListingMapperTests: XCTestCase {
    func testMapsFixturePageToJobListings() throws {
        let page = try IndeedListingMapper.decodeFixture(from: Data(searchPage0JSON.utf8))

        XCTAssertEqual(page.listings.count, 3)
        XCTAssertEqual(page.pageIndex, 0)
        XCTAssertTrue(page.hasMore)
        XCTAssertEqual(page.nextCursor, "page-1")

        let first = try XCTUnwrap(page.listings.first)
        XCTAssertEqual(first.indeedJobKey, "fixture-ios-lahore-001")
        XCTAssertEqual(first.title, "iOS Developer")
        XCTAssertEqual(first.remoteType, .hybrid)
        XCTAssertEqual(first.employmentType, .fullTime)
        XCTAssertEqual(first.experienceLevel, .mid)
        XCTAssertEqual(first.salary?.currency, "PKR")
        XCTAssertEqual(first.availability, .open)
        XCTAssertTrue(IndeedURLCanonicalizer.isIndeedHost(first.indeedURL.host ?? ""))
    }

    func testMapsBrowseURLWhenProviderKeyMissing() throws {
        let page = try IndeedListingMapper.decodeFixture(from: Data(searchPage0JSON.utf8))
        let android = try XCTUnwrap(page.listings.first { $0.title.contains("Android") })
        // No provider key + browse URL → stable hash key, openable /jobs URL.
        XCTAssertTrue(android.indeedJobKey.hasPrefix("url-"))
        XCTAssertTrue(android.indeedURL.path.contains("/jobs"))
        XCTAssertTrue(IndeedURLCanonicalizer.isIndeedHost(android.indeedURL.host ?? ""))
    }

    func testRejectsNonIndeedURL() {
        let dto = IndeedJobDTO(
            jobKey: "x",
            title: "Role",
            company: "Co",
            location: "Remote",
            url: "https://example.com/jobs/1"
        )
        XCTAssertThrowsError(try IndeedListingMapper.map(dto)) { error in
            guard case IndeedDataError.nonIndeedURL = error else {
                return XCTFail("Expected nonIndeedURL, got \(error)")
            }
        }
    }
}

final class IndeedURLCanonicalizerTests: XCTestCase {
    func testAcceptsRegionalHosts() throws {
        let url = try IndeedURLCanonicalizer.canonicalize("https://pk.indeed.com/viewjob?jk=abc")
        XCTAssertEqual(url.host, "pk.indeed.com")
        XCTAssertEqual(IndeedURLCanonicalizer.extractJobKey(from: url), "abc")
    }

    func testAcceptsIndeedCoUK() throws {
        let url = try IndeedURLCanonicalizer.canonicalize("http://indeed.co.uk/viewjob?jk=uk1")
        XCTAssertEqual(url.scheme, "https")
        XCTAssertEqual(url.host, "indeed.co.uk")
    }

    func testRejectsForeignJobBoard() {
        XCTAssertThrowsError(try IndeedURLCanonicalizer.canonicalize("https://linkedin.com/jobs/1"))
    }
}

final class FixtureIndeedJobDataSourceTests: XCTestCase {
    func testSearchPageContractFiltersByQuery() async throws {
        let page = try IndeedListingMapper.decodeFixture(from: Data(searchPage0JSON.utf8))
        let source = InlineFixtureIndeedJobDataSource(page: page)
        let results = try await source.search(criteria: SearchCriteria(), query: "iOS")
        XCTAssertTrue(results.contains { $0.title.localizedCaseInsensitiveContains("iOS") })
    }
}

/// Test double that satisfies `IndeedJobDataSource` without depending on app bundle copy phases.
private struct InlineFixtureIndeedJobDataSource: IndeedJobDataSource {
    let page: IndeedSearchPage

    func searchPage(
        criteria: SearchCriteria,
        query: String,
        page: IndeedSearchPageRequest
    ) async throws -> IndeedSearchPage {
        var filtered = self.page
        let needle = query.lowercased().trimmingCharacters(in: .whitespacesAndNewlines)
        if !needle.isEmpty {
            filtered.listings = filtered.listings.filter {
                "\($0.title) \($0.company) \($0.snippet)".lowercased().contains(needle)
            }
        }
        return filtered
    }
}