import APIClient
import Foundation
import Testing
@testable import WebTerm

/// T-iOS-32 · `claude --resume <id>` 历史（`GET /sessions`）的 App 层归约。
///
/// RED 清单见 `docs/plans/ios-completion.md` §4（E 28–35）。安全重点：会话 id 是
/// **不可信服务器字节**，而它会被拼进一条真的送进 PTY 的命令行 —— 因此白名单校验
/// 是本任务的核心用例（web 侧 `public/tabs.ts:918` 缺这一层）。
@MainActor
@Suite("ResumeHistoryViewModel")
struct ResumeHistoryViewModelTests {
    private static let projectPath = "/repos/web-terminal"

    private nonisolated static func session(
        id: String = "3f2b1c4d-0000-4000-8000-000000000001",
        cwd: String,
        mtimeMs: Double = 1_785_390_645_813.5
    ) -> HistorySession {
        HistorySession(
            id: id, cwd: cwd, project: "web-terminal", mtimeMs: mtimeMs, preview: "修一下 CJK locale"
        )
    }

    // MARK: - 过滤（28–30）

    @Test("只保留 cwd 落在本项目内的会话（含仓库根与子目录/worktree）")
    func keepsOnlySessionsInsideProject() {
        let inside = Self.session(id: "a1", cwd: Self.projectPath)
        let nested = Self.session(id: "a2", cwd: Self.projectPath + "/.claude/worktrees/x")
        let outside = Self.session(id: "a3", cwd: "/repos/other")

        let candidates = ResumeHistoryViewModel.candidates(
            from: [inside, nested, outside], projectPath: Self.projectPath
        )

        #expect(candidates.map(\.id) == ["a1", "a2"])
    }

    @Test("前缀不得半路匹配：/repos/web-terminal-old 不属于 /repos/web-terminal")
    func siblingPrefixIsNotInside() {
        let sibling = Self.session(id: "a1", cwd: "/repos/web-terminal-old")

        let candidates = ResumeHistoryViewModel.candidates(
            from: [sibling], projectPath: Self.projectPath
        )

        #expect(candidates.isEmpty)
    }

    @Test("服务器顺序（mtime 新→旧）原样保留，客户端不重排")
    func serverOrderIsPreserved() {
        let older = Self.session(id: "old", cwd: Self.projectPath, mtimeMs: 1_000)
        let newer = Self.session(id: "new", cwd: Self.projectPath, mtimeMs: 9_000)

        let candidates = ResumeHistoryViewModel.candidates(
            from: [newer, older], projectPath: Self.projectPath
        )

        #expect(candidates.map(\.id) == ["new", "old"])
    }

    @Test("cwd 非绝对路径 → 不可恢复（Validation.isAbsoluteCwd 纪律）")
    func relativeCwdIsFilteredOut() {
        let relative = Self.session(id: "a1", cwd: "repos/web-terminal")

        let candidates = ResumeHistoryViewModel.candidates(
            from: [relative], projectPath: "repos/web-terminal"
        )

        #expect(candidates.isEmpty)
    }

    // MARK: - phase（31–32）

    @Test("空结果 → .empty（不是 .failed：服务器无历史时正常回 []）")
    func emptyListIsNotFailure() async {
        let vm = ResumeHistoryViewModel(projectPath: Self.projectPath, fetch: { [] })

        await vm.load()

        #expect(vm.phase == .empty)
    }

    @Test("过滤后为空（有历史但都不属于本仓库）→ 同样 .empty")
    func allFilteredOutIsEmpty() async {
        let vm = ResumeHistoryViewModel(
            projectPath: Self.projectPath,
            fetch: { [Self.session(id: "a1", cwd: "/repos/other")] }
        )

        await vm.load()

        #expect(vm.phase == .empty)
    }

    @Test("加载失败 → .failed（可重试），重试成功 → .loaded")
    func failureIsRetryable() async {
        let flag = ResumeFailOnceFlag()
        let payload = Self.session(id: "a1", cwd: Self.projectPath)
        let vm = ResumeHistoryViewModel(projectPath: Self.projectPath, fetch: {
            if await flag.consumeShouldFail() { throw APIClientError.gitDataUnavailable }
            return [payload]
        })

        await vm.load()
        guard case .failed = vm.phase else {
            Issue.record("应为 .failed，实际 \(vm.phase)")
            return
        }

        await vm.load()
        #expect(vm.phase == .loaded(ResumeHistoryViewModel.candidates(
            from: [payload], projectPath: Self.projectPath
        )))
    }

    // MARK: - 命令合成（33–34，安全）

    @Test(
        "危险 id 绝不拼进 PTY 命令行（注入白名单）",
        arguments: [
            "abc; rm -rf ~", "abc `id`", "abc$(id)", "abc\nwhoami", "abc id", "abc'x'",
            "abc\"x\"", "abc|x", "abc&x", "abc>x", "../../etc/passwd", "",
        ]
    )
    func dangerousIdsAreRejected(sessionId: String) {
        #expect(
            ProjectResumeCommand.bootstrapInput(sessionId: sessionId) == nil,
            "\(sessionId) 不应被接受"
        )
    }

    @Test("超长 id（> 128）拒绝")
    func overlongIdRejected() {
        let long = String(repeating: "a", count: 129)

        #expect(ProjectResumeCommand.bootstrapInput(sessionId: long) == nil)
    }

    @Test("合法 id → `claude --resume <id>` 且以 \\r（0x0D）结尾，绝不是 \\n")
    func validIdBuildsCarriageReturnCommand() throws {
        let id = "3f2b1c4d-0000-4000-8000-000000000001"

        let input = try #require(ProjectResumeCommand.bootstrapInput(sessionId: id))

        #expect(input == "claude --resume \(id)\r")
        #expect(input.hasSuffix("\r"))
        #expect(!input.contains("\n"))
    }

    @Test("非法 id 的历史行仍显示，但 canResume == false（不提供恢复按钮）")
    func rowWithBadIdIsNotResumable() {
        let bad = Self.session(id: "abc; rm -rf ~", cwd: Self.projectPath)

        let candidates = ResumeHistoryViewModel.candidates(
            from: [bad], projectPath: Self.projectPath
        )

        #expect(candidates.count == 1)
        #expect(!candidates[0].canResume)
    }

    @Test("合法行 canResume == true，且携带会话自己的 cwd（worktree 会话回到 worktree）")
    func resumableRowCarriesItsOwnCwd() throws {
        let nestedCwd = Self.projectPath + "/.claude/worktrees/x"
        let session = Self.session(id: "a1", cwd: nestedCwd)

        let candidate = try #require(ResumeHistoryViewModel.candidates(
            from: [session], projectPath: Self.projectPath
        ).first)

        #expect(candidate.canResume)
        #expect(candidate.cwd == nestedCwd)
    }
}

/// 一次性失败开关（@Sendable fetch 闭包里的可变状态 → actor 隔离）。
private actor ResumeFailOnceFlag {
    private var shouldFail = true

    func consumeShouldFail() -> Bool {
        defer { shouldFail = false }
        return shouldFail
    }
}