import XCTest

@testable import ShadowsocksX_NG2

final class RuleAnalysisTests: XCTestCase {
  func testDomainShadowingSeparatesFullCoverageFromPartialOverlap() throws {
    let broad = CustomRule(
      action: .direct, match: try RuleMatch(domainSuffix: "example.com"))
    let narrow = CustomRule(action: .proxy, match: try RuleMatch(domainExact: "a.example.com"))
    let partial = RuleAnalysis(rules: [broad.proxyRule, narrow.proxyRule])
    XCTAssertEqual(
      partial.relationships,
      [
        RuleRelationship(
          rule: broad.identity, kind: .shadowing, extent: .partial,
          covering: [narrow.identity])
      ])
    let full = RuleAnalysis(rules: [
      broad.proxyRule,
      CustomRule(action: .proxy, match: try RuleMatch(domainSuffix: "example.com"))
        .proxyRule,
    ])
    XCTAssertEqual(full.relationships.first?.extent, .full)
  }
  func testIdentityNormalizesContentWithoutUsingCustomUUIDOrMergingFamilies() throws {
    let host = CustomRule(action: .proxy, match: try RuleMatch(ipv4CIDR: "203.0.113.8"))
    let cidr = CustomRule(action: .proxy, match: try RuleMatch(ipv4CIDR: "203.0.113.8/32"))
    XCTAssertNotEqual(host.id, cidr.id)
    XCTAssertEqual(host.identity, cidr.identity)
    XCTAssertEqual(host.contentToken, cidr.contentToken)
    XCTAssertNotEqual(
      host.identity,
      CustomRule(action: .direct, match: host.match).identity)
    XCTAssertNotEqual(
      host.identity,
      CustomRule(action: .proxy, match: try RuleMatch(ipv6CIDR: "::ffff:203.0.113.8/128")).identity)
    XCTAssertEqual(
      CustomRule(action: .direct, match: try RuleMatch(domainSuffix: ".Example.COM"))
        .identity.match,
      try RuleMatch(domainSuffix: "example.com"))
  }

  func testAnalysisAndVersionsDoNotDependOnDuplicateRulesOrCustomOrder() throws {
    let custom = [
      CustomRule(action: .direct, match: try RuleMatch(domainSuffix: "example.com")),
      CustomRule(action: .direct, match: try RuleMatch(domainExact: "a.example.com")),
      CustomRule(action: .proxy, match: try RuleMatch(domainExact: "a.example.com")),
    ]
    let builtIn = [
      ProxyRule(action: .proxy, match: try RuleMatch(domainSuffix: "a.example.com"))
    ]
    let expected = RuleAnalysis(rules: builtIn + custom.map(\.proxyRule))
    for order in [custom, Array(custom.reversed()), [custom[1], custom[2], custom[0]]] {
      for sourceOrder in [builtIn, builtIn + builtIn] {
        let actual = RuleAnalysis(rules: order.map(\.proxyRule) + sourceOrder)
        XCTAssertEqual(actual, expected)
        XCTAssertEqual(actual.contentVersion, expected.contentVersion)
        XCTAssertEqual(CustomRuleSummary.summarizing(order), CustomRuleSummary.summarizing(custom))
        for action in RuleDefaultAction.allCases {
          XCTAssertEqual(
            CustomRuleValidator.validate(
              custom: order, builtIn: sourceOrder, defaultAction: action),
            CustomRuleValidator.validate(custom: custom, builtIn: builtIn, defaultAction: action))
        }
      }
    }
    XCTAssertTrue(expected.relationships.contains { $0.kind == .absorption && $0.extent == .full })
    XCTAssertTrue(
      expected.relationships.contains { $0.kind == .shadowing && $0.extent == .partial })
  }

  func testIPCoverageCombinesNarrowerRangesAndKeepsPartialRemainder() throws {
    let broad = CustomRule(action: .proxy, match: try RuleMatch(ipv4CIDR: "203.0.113.0/24"))
    let lower = CustomRule(action: .direct, match: try RuleMatch(ipv4CIDR: "203.0.113.0/25"))
    let upper = CustomRule(
      action: .direct, match: try RuleMatch(ipv6CIDR: "::ffff:203.0.113.128/121"))
    XCTAssertEqual(
      RuleAnalysis(rules: [broad.proxyRule, lower.proxyRule])
        .relationships.first?.extent, .partial)
    let full = RuleAnalysis(rules: [upper.proxyRule, broad.proxyRule, lower.proxyRule])
    XCTAssertEqual(full.relationships.first?.extent, .full)
    XCTAssertEqual(full.relationships.first?.covering.count, 2)
  }

  func testSuffixBoundaryAndMappedCoverageFollowSslocal() throws {
    XCTAssertFalse(
      RuleCoverage.domainIntersects(
        try RuleMatch(domainSuffix: "example.com"),
        try RuleMatch(domainExact: "notexample.com")))
    XCTAssertFalse(
      RuleCoverage.domainCovers(
        try RuleMatch(domainExact: "example.com"), try RuleMatch(domainExact: "a.example.com")))
    XCTAssertTrue(
      RuleCoverage.ipCovers(
        try RuleMatch(ipv4CIDR: "203.0.113.0/24"), try RuleMatch(ipv6CIDR: "::ffff:203.0.113.8/128")
      ))
    XCTAssertTrue(
      RuleCoverage.ipCovers(
        try RuleMatch(ipv6CIDR: "::ffff:203.0.113.0/120"), try RuleMatch(ipv4CIDR: "203.0.113.8/32")
      ))
    XCTAssertFalse(
      RuleCoverage.ipIntersects(
        try RuleMatch(ipv4CIDR: "203.0.113.0/24"), try RuleMatch(ipv6CIDR: "2001:db8::/32")))
  }

}