import XCTest
import Foundation

final class BrowserPaneNavigationKeybindUITests: XCTestCase {
    private var dataPath = ""
    private var socketPath = ""

    override func setUp() {
        super.setUp()
        continueAfterFailure = false
        dataPath = "/tmp/cmux-ui-test-goto-split-\(UUID().uuidString).json"
        try? FileManager.default.removeItem(atPath: dataPath)
        socketPath = "/tmp/cmux-ui-test-socket-\(UUID().uuidString).sock"
        try? FileManager.default.removeItem(atPath: socketPath)
    }

    func testCmdCtrlHMovesLeftWhenWebViewFocused() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["terminalPaneId", "browserPaneId", "webViewFocused"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        XCTAssertEqual(setup["webViewFocused"], "true", "Expected WKWebView to be first responder for this test")

        guard let expectedTerminalPaneId = setup["terminalPaneId"] else {
            XCTFail("Missing terminalPaneId in goto_split setup data")
            return
        }

        // Trigger pane navigation via the actual key event path (while WebKit is first responder).
        app.typeKey("h", modifierFlags: [.command, .control])

        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["lastMoveDirection"] == "left" && data["focusedPaneId"] == expectedTerminalPaneId
            },
            "Expected Cmd+Ctrl+H to move focus to left pane (terminal)"
        )
    }

    func testCmdCtrlHMovesLeftWhenWebViewFocusedUsingGhosttyConfigKeybind() {
        // Write a test Ghostty config in the preferred macOS location so GhosttyKit loads it at app startup.
        let fileManager = FileManager.default
        guard let appSupport = fileManager.urls(for: .applicationSupportDirectory, in: .userDomainMask).first else {
            XCTFail("Missing Application Support directory")
            return
        }

        let ghosttyDir = appSupport.appendingPathComponent("com.mitchellh.ghostty", isDirectory: true)
        let configURL = ghosttyDir.appendingPathComponent("config.ghostty", isDirectory: false)

        do {
            try fileManager.createDirectory(at: ghosttyDir, withIntermediateDirectories: true)
        } catch {
            XCTFail("Failed to create Ghostty app support dir: \(error)")
            return
        }

        let originalConfigData = try? Data(contentsOf: configURL)
        addTeardownBlock {
            if let originalConfigData {
                try? originalConfigData.write(to: configURL, options: .atomic)
            } else {
                try? fileManager.removeItem(at: configURL)
            }
        }

        let home = fileManager.homeDirectoryForCurrentUser
        let configContents = """
        # cmux ui test
        working-directory = \(home.path)
        keybind = cmd+ctrl+h=goto_split:left
        """
        do {
            try configContents.write(to: configURL, atomically: true, encoding: .utf8)
        } catch {
            XCTFail("Failed to write Ghostty config: \(error)")
            return
        }

        let app = XCUIApplication()
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_USE_GHOSTTY_CONFIG"] = "1"
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["terminalPaneId", "browserPaneId", "webViewFocused", "ghosttyGotoSplitLeftShortcut"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        XCTAssertEqual(setup["webViewFocused"], "true", "Expected WKWebView to be first responder for this test")
        XCTAssertEqual(setup["ghosttyGotoSplitLeftShortcut"], "⌃⌘H", "Expected Ghostty config trigger to be Cmd+Ctrl+H")

        guard let expectedTerminalPaneId = setup["terminalPaneId"] else {
            XCTFail("Missing terminalPaneId in goto_split setup data")
            return
        }

        // Trigger pane navigation via the actual key event path (while WebKit is first responder).
        app.typeKey("h", modifierFlags: [.command, .control])

        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["lastMoveDirection"] == "left" && data["focusedPaneId"] == expectedTerminalPaneId
            },
            "Expected Cmd+Ctrl+H to move focus to left pane (terminal) via Ghostty config trigger"
        )
    }

    func testEscapeLeavesOmnibarAndFocusesWebView() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["browserPanelId", "webViewFocused"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        XCTAssertEqual(setup["webViewFocused"], "true", "Expected WKWebView to be first responder for this test")

        // Cmd+L focuses the omnibar (so WebKit is no longer first responder).
        app.typeKey("l", modifierFlags: [.command])
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["webViewFocusedAfterAddressBarFocus"] == "false"
            },
            "Expected Cmd+L to focus omnibar (WebKit not first responder)"
        )

        // Escape should leave the omnibar and focus WebKit again.
        // Send Escape twice: the first may only clear suggestions/editing state
        // (Chrome-like two-stage escape), the second triggers blur to WebView.
        app.typeKey(XCUIKeyboardKey.escape.rawValue, modifierFlags: [])
        if !waitForDataMatch(timeout: 2.0, predicate: { $0["webViewFocusedAfterAddressBarExit"] == "true" }) {
            app.typeKey(XCUIKeyboardKey.escape.rawValue, modifierFlags: [])
        }
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["webViewFocusedAfterAddressBarExit"] == "true"
            },
            "Expected Escape to return focus to WebKit"
        )
    }

    func testCmdLOpensBrowserWhenTerminalFocused() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["browserPanelId", "terminalPaneId", "webViewFocused"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        guard let originalBrowserPanelId = setup["browserPanelId"] else {
            XCTFail("Missing browserPanelId in goto_split setup data")
            return
        }

        guard let expectedTerminalPaneId = setup["terminalPaneId"] else {
            XCTFail("Missing terminalPaneId in goto_split setup data")
            return
        }

        // Move focus to the terminal pane first.
        app.typeKey("h", modifierFlags: [.command, .control])
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["lastMoveDirection"] == "left" && data["focusedPaneId"] == expectedTerminalPaneId
            },
            "Expected Cmd+Ctrl+H to move focus to left pane (terminal)"
        )

        // Cmd+L should open a browser in the focused pane, then focus omnibar.
        app.typeKey("l", modifierFlags: [.command])
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                guard data["webViewFocusedAfterAddressBarFocus"] == "false" else { return false }
                guard let focusedAddressPanelId = data["webViewFocusedAfterAddressBarFocusPanelId"] else { return false }
                return focusedAddressPanelId != originalBrowserPanelId
            },
            "Expected Cmd+L on terminal focus to open a new browser and focus omnibar"
        )
    }

    func testClickingOmnibarFocusesBrowserPane() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["browserPanelId", "terminalPaneId", "webViewFocused"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        guard let expectedBrowserPanelId = setup["browserPanelId"] else {
            XCTFail("Missing browserPanelId in goto_split setup data")
            return
        }

        guard let expectedTerminalPaneId = setup["terminalPaneId"] else {
            XCTFail("Missing terminalPaneId in goto_split setup data")
            return
        }

        // Move focus away from browser to terminal first.
        app.typeKey("h", modifierFlags: [.command, .control])
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["lastMoveDirection"] == "left" && data["focusedPaneId"] == expectedTerminalPaneId
            },
            "Expected Cmd+Ctrl+H to move focus to left pane (terminal)"
        )

        let omnibar = app.textFields["BrowserOmnibarTextField"].firstMatch
        XCTAssertTrue(omnibar.waitForExistence(timeout: 6.0), "Expected browser omnibar text field")
        omnibar.click()

        // Cmd+L behavior is context-aware:
        // - If terminal is focused: opens a new browser and focuses that new omnibar.
        // - If browser is focused: focuses current browser omnibar.
        // After clicking the omnibar, Cmd+L should stay on the existing browser panel.
        app.typeKey("l", modifierFlags: [.command])
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                guard data["webViewFocusedAfterAddressBarFocus"] == "false" else { return false }
                return data["webViewFocusedAfterAddressBarFocusPanelId"] == expectedBrowserPanelId
            },
            "Expected omnibar click to focus browser panel so Cmd+L stays on that browser"
        )
    }

    func testCmdDSplitsRightWhenWebViewFocused() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["webViewFocused", "initialPaneCount"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        XCTAssertEqual(setup["webViewFocused"], "true", "Expected WKWebView to be first responder for this test")
        let initialPaneCount = Int(setup["initialPaneCount"] ?? "") ?? 0
        XCTAssertGreaterThanOrEqual(initialPaneCount, 2, "Expected at least two panes before split. data=\(setup)")

        app.typeKey("d", modifierFlags: [.command])

        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                guard data["lastSplitDirection"] == "right" else { return false }
                guard let paneCountAfter = Int(data["paneCountAfterSplit"] ?? "") else { return false }
                return paneCountAfter == initialPaneCount + 1
            },
            "Expected Cmd+D to split right while WKWebView is first responder"
        )
    }

    func testCmdShiftDSplitsDownWhenWebViewFocused() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["webViewFocused", "initialPaneCount"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        XCTAssertEqual(setup["webViewFocused"], "true", "Expected WKWebView to be first responder for this test")
        let initialPaneCount = Int(setup["initialPaneCount"] ?? "") ?? 0
        XCTAssertGreaterThanOrEqual(initialPaneCount, 2, "Expected at least two panes before split. data=\(setup)")

        app.typeKey("d", modifierFlags: [.command, .shift])

        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                guard data["lastSplitDirection"] == "down" else { return false }
                guard let paneCountAfter = Int(data["paneCountAfterSplit"] ?? "") else { return false }
                return paneCountAfter == initialPaneCount + 1
            },
            "Expected Cmd+Shift+D to split down while WKWebView is first responder"
        )
    }

    func testCmdDSplitsRightWhenOmnibarFocused() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["webViewFocused", "initialPaneCount"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        let initialPaneCount = Int(setup["initialPaneCount"] ?? "") ?? 0
        XCTAssertGreaterThanOrEqual(initialPaneCount, 2, "Expected at least two panes before split. data=\(setup)")

        // Focus browser omnibar (WebKit no longer first responder).
        app.typeKey("l", modifierFlags: [.command])
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["webViewFocusedAfterAddressBarFocus"] == "false"
            },
            "Expected Cmd+L to focus omnibar before split"
        )

        app.typeKey("d", modifierFlags: [.command])

        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                guard data["lastSplitDirection"] == "right" else { return false }
                guard let paneCountAfter = Int(data["paneCountAfterSplit"] ?? "") else { return false }
                return paneCountAfter == initialPaneCount + 1
            },
            "Expected Cmd+D to split right while omnibar is first responder"
        )
    }

    func testCmdShiftDSplitsDownWhenOmnibarFocused() {
        let app = XCUIApplication()
        app.launchEnvironment["CMUX_SOCKET_PATH"] = socketPath
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_SETUP"] = "1"
        app.launchEnvironment["CMUX_UI_TEST_GOTO_SPLIT_PATH"] = dataPath
        launchAndEnsureForeground(app)

        XCTAssertTrue(
            waitForData(keys: ["webViewFocused", "initialPaneCount"], timeout: 10.0),
            "Expected goto_split setup data to be written"
        )

        guard let setup = loadData() else {
            XCTFail("Missing goto_split setup data")
            return
        }

        let initialPaneCount = Int(setup["initialPaneCount"] ?? "") ?? 0
        XCTAssertGreaterThanOrEqual(initialPaneCount, 2, "Expected at least two panes before split. data=\(setup)")

        // Focus browser omnibar (WebKit no longer first responder).
        app.typeKey("l", modifierFlags: [.command])
        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                data["webViewFocusedAfterAddressBarFocus"] == "false"
            },
            "Expected Cmd+L to focus omnibar before split"
        )

        app.typeKey("d", modifierFlags: [.command, .shift])

        XCTAssertTrue(
            waitForDataMatch(timeout: 5.0) { data in
                guard data["lastSplitDirection"] == "down" else { return false }
                guard let paneCountAfter = Int(data["paneCountAfterSplit"] ?? "") else { return false }
                return paneCountAfter == initialPaneCount + 1
            },
            "Expected Cmd+Shift+D to split down while omnibar is first responder"
        )
    }

    private func launchAndEnsureForeground(_ app: XCUIApplication, timeout: TimeInterval = 12.0) {
        app.launch()
        XCTAssertTrue(
            ensureForegroundAfterLaunch(app, timeout: timeout),
            "Expected app to launch in foreground. state=\(app.state.rawValue)"
        )
    }

    private func ensureForegroundAfterLaunch(_ app: XCUIApplication, timeout: TimeInterval) -> Bool {
        if app.wait(for: .runningForeground, timeout: timeout) {
            return true
        }
        if app.state == .runningBackground {
            app.activate()
            return app.wait(for: .runningForeground, timeout: 6.0)
        }
        return false
    }

    private func waitForData(keys: [String], timeout: TimeInterval) -> Bool {
        let deadline = Date().addingTimeInterval(timeout)
        while Date() < deadline {
            if let data = loadData(), keys.allSatisfy({ data[$0] != nil }) {
                return true
            }
            RunLoop.current.run(until: Date().addingTimeInterval(0.05))
        }
        if let data = loadData(), keys.allSatisfy({ data[$0] != nil }) {
            return true
        }
        return false
    }

    private func waitForDataMatch(timeout: TimeInterval, predicate: ([String: String]) -> Bool) -> Bool {
        let deadline = Date().addingTimeInterval(timeout)
        while Date() < deadline {
            if let data = loadData(), predicate(data) {
                return true
            }
            RunLoop.current.run(until: Date().addingTimeInterval(0.05))
        }
        if let data = loadData(), predicate(data) {
            return true
        }
        return false
    }

    private func loadData() -> [String: String]? {
        guard let data = try? Data(contentsOf: URL(fileURLWithPath: dataPath)) else {
            return nil
        }
        return (try? JSONSerialization.jsonObject(with: data)) as? [String: String]
    }
}