import QtQuick
import Quickshell
import Quickshell.Io
pragma Singleton
pragma ComponentBehavior: Bound

Singleton {
    id: root
    
    // Workspace management
    property list<var> allWorkspaces: []
    property int focusedWorkspaceIndex: 0
    property string focusedWorkspaceId: ""
    property var currentOutputWorkspaces: []
    property string currentOutput: ""
    
    // Window management
    property list<var> windows: []
    property int focusedWindowIndex: -1
    property string focusedWindowTitle: "(No active window)"
    property string focusedWindowId: ""
    
    // Overview state
    property bool inOverview: false
    
    // Feature availability
    property bool niriAvailable: false
    
    Component.onCompleted: {
        console.log("NiriWorkspaceService: Component.onCompleted - initializing service")
        checkNiriAvailability()
    }
    
    // Check if niri is available
    Process {
        id: niriCheck
        command: ["which", "niri"]
        
        onExited: (exitCode) => {
            root.niriAvailable = exitCode === 0
            if (root.niriAvailable) {
                console.log("NiriWorkspaceService: niri found, starting event stream and loading initial data")
                eventStreamProcess.running = true
                loadInitialWorkspaceData()
            } else {
                console.log("NiriWorkspaceService: niri not found, workspace features disabled")
            }
        }
    }
    
    function checkNiriAvailability() {
        niriCheck.running = true
    }
    
    // Load initial workspace data
    Process {
        id: initialDataQuery
        command: ["niri", "msg", "-j", "workspaces"]
        running: false
        
        stdout: StdioCollector {
            onStreamFinished: {
                if (text && text.trim()) {
                    try {
                        console.log("NiriWorkspaceService: Loaded initial workspace data")
                        const workspaces = JSON.parse(text.trim())
                        // Initial query returns array directly, event stream wraps it in WorkspacesChanged
                        handleWorkspacesChanged({ workspaces: workspaces })
                    } catch (e) {
                        console.warn("NiriWorkspaceService: Failed to parse initial workspace data:", e)
                    }
                }
            }
        }
    }
    
    function loadInitialWorkspaceData() {
        console.log("NiriWorkspaceService: Loading initial workspace data...")
        initialDataQuery.running = true
    }
    
    // Event stream for real-time updates
    Process {
        id: eventStreamProcess
        command: ["niri", "msg", "-j", "event-stream"]
        running: false // Will be enabled after niri check
        
        stdout: SplitParser {
            onRead: data => {
                try {
                    const event = JSON.parse(data.trim())
                    handleNiriEvent(event)
                } catch (e) {
                    console.warn("NiriWorkspaceService: Failed to parse event:", data, e)
                }
            }
        }
        
        onExited: (exitCode) => {
            if (exitCode !== 0 && root.niriAvailable) {
                console.warn("NiriWorkspaceService: Event stream exited with code", exitCode, "restarting in 2 seconds")
                restartTimer.start()
            }
        }
    }
    
    // Restart timer for event stream
    Timer {
        id: restartTimer
        interval: 2000
        onTriggered: {
            if (root.niriAvailable) {
                eventStreamProcess.running = true
            }
        }
    }
    
    function handleNiriEvent(event) {
        if (event.WorkspacesChanged) {
            handleWorkspacesChanged(event.WorkspacesChanged)
        } else if (event.WorkspaceActivated) {
            handleWorkspaceActivated(event.WorkspaceActivated)
        } else if (event.WindowsChanged) {
            handleWindowsChanged(event.WindowsChanged)
        } else if (event.WindowClosed) {
            handleWindowClosed(event.WindowClosed)
        } else if (event.WindowFocusChanged) {
            handleWindowFocusChanged(event.WindowFocusChanged)
        } else if (event.OverviewOpenedOrClosed) {
            handleOverviewChanged(event.OverviewOpenedOrClosed)
        }
    }
    
    function handleWorkspacesChanged(data) {
        allWorkspaces = [...data.workspaces].sort((a, b) => a.idx - b.idx)
        
        // Update focused workspace
        focusedWorkspaceIndex = allWorkspaces.findIndex(w => w.is_focused)
        if (focusedWorkspaceIndex >= 0) {
            var focusedWs = allWorkspaces[focusedWorkspaceIndex]
            focusedWorkspaceId = focusedWs.id
            currentOutput = focusedWs.output || ""
        } else {
            focusedWorkspaceIndex = 0
            focusedWorkspaceId = ""
        }
        
        updateCurrentOutputWorkspaces()
    }
    
    function handleWorkspaceActivated(data) {
        // Update focused workspace
        focusedWorkspaceId = data.id
        focusedWorkspaceIndex = allWorkspaces.findIndex(w => w.id === data.id)
        
        if (focusedWorkspaceIndex >= 0) {
            var activatedWs = allWorkspaces[focusedWorkspaceIndex]
            
            // Update workspace states properly
            // First, deactivate all workspaces on this output
            for (var i = 0; i < allWorkspaces.length; i++) {
                if (allWorkspaces[i].output === activatedWs.output) {
                    allWorkspaces[i].is_active = false
                    allWorkspaces[i].is_focused = false
                }
            }
            
            // Then activate the new workspace
            allWorkspaces[focusedWorkspaceIndex].is_active = true
            allWorkspaces[focusedWorkspaceIndex].is_focused = data.focused || false
            
            currentOutput = activatedWs.output || ""
            
            updateCurrentOutputWorkspaces()
        } else {
            focusedWorkspaceIndex = 0
        }
    }
    
    function handleWindowsChanged(data) {
        windows = [...data.windows].sort((a, b) => a.id - b.id)
        updateFocusedWindow()
    }
    
    function handleWindowClosed(data) {
        windows = windows.filter(w => w.id !== data.id)
        updateFocusedWindow()
    }
    
    function handleWindowFocusChanged(data) {
        if (data.id) {
            focusedWindowId = data.id
            focusedWindowIndex = windows.findIndex(w => w.id === data.id)
        } else {
            focusedWindowId = ""
            focusedWindowIndex = -1
        }
        updateFocusedWindow()
    }
    
    function handleOverviewChanged(data) {
        inOverview = data.is_open
    }
    
    function updateCurrentOutputWorkspaces() {
        if (!currentOutput) {
            currentOutputWorkspaces = allWorkspaces
            return
        }
        
        // Filter workspaces for current output
        var outputWs = allWorkspaces.filter(w => w.output === currentOutput)
        currentOutputWorkspaces = outputWs
    }
    
    function updateFocusedWindow() {
        if (focusedWindowIndex >= 0 && focusedWindowIndex < windows.length) {
            var focusedWin = windows[focusedWindowIndex]
            focusedWindowTitle = focusedWin.title || "(Unnamed window)"
        } else {
            focusedWindowTitle = "(No active window)"
        }
    }
    
    // Public API functions
    function switchToWorkspace(workspaceId) {
        if (!niriAvailable) return false
        
        Quickshell.execDetached(["niri", "msg", "action", "focus-workspace", workspaceId.toString()])
        return true
    }
    
    function switchToWorkspaceByIndex(index) {
        if (!niriAvailable || index < 0 || index >= allWorkspaces.length) return false
        
        var workspace = allWorkspaces[index]
        return switchToWorkspace(workspace.id)
    }
    
    function switchToWorkspaceByNumber(number, output) {
        if (!niriAvailable) return false
        
        var targetOutput = output || currentOutput
        if (!targetOutput) {
            console.warn("NiriWorkspaceService: No output specified for workspace switching")
            return false
        }
        
        // Get workspaces for the target output, sorted by idx
        var outputWorkspaces = allWorkspaces.filter(w => w.output === targetOutput).sort((a, b) => a.idx - b.idx)
        
        // Use sequential index (number is 1-based, array is 0-based)
        if (number >= 1 && number <= outputWorkspaces.length) {
            var workspace = outputWorkspaces[number - 1]
            return switchToWorkspace(workspace.id)
        }
        
        console.warn("NiriWorkspaceService: No workspace", number, "found on output", targetOutput)
        return false
    }
    
    function getWorkspaceByIndex(index) {
        if (index >= 0 && index < allWorkspaces.length) {
            return allWorkspaces[index]
        }
        return null
    }
    
    function getCurrentOutputWorkspaceNumbers() {
        return currentOutputWorkspaces.map(w => w.idx + 1) // niri uses 0-based, UI shows 1-based
    }
    
    function getCurrentWorkspaceNumber() {
        if (focusedWorkspaceIndex >= 0 && focusedWorkspaceIndex < allWorkspaces.length) {
            return allWorkspaces[focusedWorkspaceIndex].idx + 1
        }
        return 1
    }
    
    function isWorkspaceActive(workspaceNumber) {
        return workspaceNumber === getCurrentWorkspaceNumber()
    }
    
    // For compatibility with existing components
    function getCurrentWorkspace() {
        return getCurrentWorkspaceNumber()
    }
    
    function getWorkspaceList() {
        return getCurrentOutputWorkspaceNumbers()
    }
}