package nativewindow

import (
	"strings"
)

const (
	// DetachedWindowArgument selects the native detached-window child mode.
	DetachedWindowArgument = "--detached-window"

	HeaderToken    = "X-GoNavi-Detached-Token"
	HeaderWindowID = "X-GoNavi-Detached-Window-ID"

	BootstrapPath    = "/__gonavi/detached/bootstrap"
	ActionPath       = "/__gonavi/detached/action"
	ControlPath      = "/__gonavi/detached/control"
	HostStatePath    = "/__gonavi/detached/host-state"
	CommandStatePath = "/__gonavi/detached/command-state"
	RuntimePath      = "/__gonavi/detached-runtime.js"
	InvokePath       = "/__gonavi/api/invoke"
	EventsPath       = "/__gonavi/events"

	MainEventName    = "gonavi:native-detached-event"
	CommandEventName = "gonavi:native-detached-command"
	// GracefulCloseRequestEventName is dispatched inside a detached WebView so
	// React can flush state before the native child process exits.
	GracefulCloseRequestEventName = "gonavi:native-detached-request-close"
	// GracefulHideRequestEventName asks an already-mounted detached frontend to
	// flush its state before parking the native window without exiting its
	// process. The visibility revision prevents a late hide from winning over a
	// newer focus request.
	GracefulHideRequestEventName = "gonavi:native-detached-request-hide"

	ExitReasonRequested      = "requested"
	ExitReasonWindowClosed   = "window-closed"
	ExitReasonAttached       = "attached"
	ExitReasonParentShutdown = "parent-shutdown"
	ExitReasonProcessError   = "process-error"
)

const (
	defaultWindowWidth  = 1080
	defaultWindowHeight = 720
	// Detached query results can be substantially larger than ordinary RPC
	// payloads. Keep one shared ceiling for child actions and parent responses.
	maxDetachedJSONBytes     int64 = 512 << 20
	maxDetachedSSEEventBytes       = maxDetachedJSONBytes + (1 << 20)
)

// OpenRequest describes one independently movable native window. X and Y use
// virtual-desktop coordinates and deliberately allow negative values.
type OpenRequest struct {
	ID      string `json:"id,omitempty"`
	Kind    string `json:"kind"`
	Title   string `json:"title"`
	Payload any    `json:"payload,omitempty"`
	X       int    `json:"x"`
	Y       int    `json:"y"`
	Width   int    `json:"width"`
	Height  int    `json:"height"`
}

// WindowBounds uses the browser/Wails virtual desktop coordinate system with
// the primary display's top-left as the origin. Negative coordinates remain
// valid for displays arranged to the left or above the primary display.
type WindowBounds struct {
	X      int `json:"x"`
	Y      int `json:"y"`
	Width  int `json:"width"`
	Height int `json:"height"`
}

// WindowInfo is the serialisable view of a registered child process.
type WindowInfo struct {
	ID        string `json:"id"`
	Kind      string `json:"kind"`
	Title     string `json:"title"`
	X         int    `json:"x"`
	Y         int    `json:"y"`
	Width     int    `json:"width"`
	Height    int    `json:"height"`
	PID       int    `json:"pid,omitempty"`
	OpenedAt  int64  `json:"openedAt"`
	Ready     bool   `json:"ready"`
	CloseSent bool   `json:"closeSent"`
	Hidden    bool   `json:"hidden,omitempty"`
}

// Bootstrap is fetched by the child after Wails has installed its native
// runtime and bindings.
type Bootstrap struct {
	ID             string `json:"id"`
	Kind           string `json:"kind"`
	Title          string `json:"title"`
	Payload        any    `json:"payload,omitempty"`
	ActionRevision int64  `json:"actionRevision,omitempty"`
}

// OperationResult is returned by the Wails-bound Manager commands.
type OperationResult struct {
	Success            bool          `json:"success"`
	Message            string        `json:"message,omitempty"`
	ID                 string        `json:"id,omitempty"`
	Bounds             *WindowBounds `json:"bounds,omitempty"`
	VisibilityRevision uint64        `json:"visibilityRevision,omitempty"`
	// Applied is set only for revisioned child actions. A nil value preserves
	// compatibility with ordinary manager/control results and older parents.
	Applied *bool `json:"applied,omitempty"`
}

// HostStateRequest carries main-window state that an active detached child
// needs to follow. Revision is strictly monotonic per child window ID.
type HostStateRequest struct {
	ID         string         `json:"id"`
	Revision   int64          `json:"revision"`
	StoreState map[string]any `json:"storeState"`
}

type hostStatePayload struct {
	Revision   int64          `json:"revision"`
	StoreState map[string]any `json:"storeState"`
}

// Event is emitted to the main Wails window. Action mirrors the detached HTTP
// action protocol so the frontend can use one reducer for child messages and
// process-exit notifications.
type Event struct {
	ID      string `json:"id"`
	Kind    string `json:"kind"`
	Action  string `json:"action"`
	Payload any    `json:"payload,omitempty"`
}

type actionRequest struct {
	Action  string `json:"action"`
	Payload any    `json:"payload,omitempty"`
}

type controlRequest struct {
	Action  string      `json:"action"`
	ID      string      `json:"id,omitempty"`
	Request OpenRequest `json:"request,omitempty"`
}

type childCommand struct {
	ID      string `json:"id"`
	Action  string `json:"action"`
	Reason  string `json:"reason,omitempty"`
	Payload any    `json:"payload,omitempty"`
}

func normalizeOpenRequest(request OpenRequest) OpenRequest {
	request.Kind = strings.TrimSpace(request.Kind)
	request.Title = strings.TrimSpace(request.Title)
	if request.Kind == "" {
		request.Kind = "workbench"
	}
	if request.Title == "" {
		request.Title = "GoNavi"
	}
	if request.Width <= 0 {
		request.Width = defaultWindowWidth
	}
	if request.Height <= 0 {
		request.Height = defaultWindowHeight
	}
	return request
}