import Testing
import Foundation
@testable import TXCore

@Suite("tmux control-mode 解析器")
struct TmuxControlParserTests {

    @Test("命令应答块按序号关联")
    func commandBlock() {
        let p = TmuxControlParser()
        let events = p.feed("%begin 1678 7 1\nhello\nworld\n%end 1678 7 1\n")
        #expect(events.count == 1)
        guard case .commandResponse(let r) = events[0] else {
            Issue.record("期望 commandResponse"); return
        }
        #expect(r.number == 7)
        #expect(r.isError == false)
        #expect(r.lines == ["hello", "world"])
    }

    @Test("%error 块标记为错误")
    func errorBlock() {
        let p = TmuxControlParser()
        let events = p.feed("%begin 1 3 1\nno server\n%error 1 3 1\n")
        guard case .commandResponse(let r) = events.first else {
            Issue.record("期望 commandResponse"); return
        }
        #expect(r.isError)
        #expect(r.number == 3)
    }

    @Test("块内以 % 开头的行不解释为通知")
    func percentInsideBlock() {
        let p = TmuxControlParser()
        let events = p.feed("%begin 1 1 1\n%output not-a-notification\n%end 1 1 1\n")
        #expect(events.count == 1)
        guard case .commandResponse(let r) = events.first else {
            Issue.record("期望 commandResponse"); return
        }
        #expect(r.lines == ["%output not-a-notification"])
    }

    @Test("%output 解析出 pane 与字节")
    func output() {
        let p = TmuxControlParser()
        let events = p.feed("%output %2 ready\\012\n")
        guard case .output(let pane, let data) = events.first else {
            Issue.record("期望 output"); return
        }
        #expect(pane == TmuxPaneID(2))
        #expect(data == Data("ready\n".utf8))
    }

    @Test("跨 feed 的残行被正确缓冲")
    func splitAcrossFeeds() {
        let p = TmuxControlParser()
        #expect(p.feed("%output %0 par").isEmpty)   // 无换行 → 无事件
        let events = p.feed("tial\n")
        guard case .output(_, let data) = events.first else {
            Issue.record("期望 output"); return
        }
        #expect(data == Data("partial".utf8))
    }

    @Test("CRLF 行尾被容忍")
    func crlf() {
        let p = TmuxControlParser()
        let events = p.feed("%window-add @5\r\n")
        #expect(events == [.windowAdd(TmuxWindowID(5))])
    }

    @Test("窗口生命周期通知")
    func windowNotifications() {
        let p = TmuxControlParser()
        #expect(p.feed("%window-add @1\n") == [.windowAdd(TmuxWindowID(1))])
        #expect(p.feed("%window-close @1\n") == [.windowClose(TmuxWindowID(1))])
        #expect(p.feed("%window-renamed @2 my shell\n")
                == [.windowRenamed(TmuxWindowID(2), name: "my shell")])
    }

    @Test("会话与布局通知")
    func sessionAndLayout() {
        let p = TmuxControlParser()
        #expect(p.feed("%session-changed $1 main\n")
                == [.sessionChanged(TmuxSessionID(1), name: "main")])
        let layout = p.feed("%layout-change @3 bc62,80x24,0,0,0\n")
        #expect(layout == [.layoutChange(window: TmuxWindowID(3),
                                         layout: "bc62,80x24,0,0,0",
                                         visibleLayout: nil)])
    }

    @Test("流控与退出")
    func flowControlAndExit() {
        let p = TmuxControlParser()
        #expect(p.feed("%pause %4\n") == [.pause(TmuxPaneID(4))])
        #expect(p.feed("%continue %4\n") == [.unpause(TmuxPaneID(4))])
        #expect(p.feed("%exit\n") == [.exit(reason: nil)])
        #expect(p.feed("%exit server exited\n") == [.exit(reason: "server exited")])
    }

    @Test("未知通知降级为 .unknown 而非崩溃")
    func unknownNotification() {
        let p = TmuxControlParser()
        let events = p.feed("%some-future-notification foo bar\n")
        #expect(events == [.unknown(line: "%some-future-notification foo bar")])
    }

    @Test("attach 后的隐式空块")
    func implicitEmptyBlock() {
        let p = TmuxControlParser()
        let events = p.feed("%begin 100 0 0\n%end 100 0 0\n")
        guard case .commandResponse(let r) = events.first else {
            Issue.record("期望空 commandResponse"); return
        }
        #expect(r.lines.isEmpty)
        #expect(r.number == 0)
    }
}