package qemuconnection

import (
	"encoding/json"
	"fmt"

	"github.com/digitalocean/go-qemu/qmp"
)

const (
	MouseMoveEvent = iota
	MouseButtonEvent
	KeyboardEvent
	ControlEvent
	QueryStatusEvent
)

const (
	ControlEventRestart = iota
)

type Event struct {
	Type int            `json:"type"`
	Args map[string]any `json:"args"`
}

type CommandLine struct {
	Command string `json:"command-line"`
}

func ParseEvent(b []byte) (*Event, error) {
	event := &Event{}
	if err := json.Unmarshal(b, event); err != nil {
		return nil, err
	}
	return event, nil
}

func (e *Event) ToQemuCommand() []qmp.Command {
	switch e.Type {
	case MouseMoveEvent:
		return []qmp.Command{
			makeHMCommand("mouse_move %d %d %d", e.Args["dx"], e.Args["dy"], e.Args["dz"]),
		}
	case MouseButtonEvent:
		return []qmp.Command{
			makeHMCommand("mouse_button %d", e.Args["button"]),
		}
	case KeyboardEvent:
		return []qmp.Command{
			makeHMCommand("sendkey %s", e.Args["key"]),
		}
	case ControlEvent:
		t, ok := e.Args["cmd"].(int)
		if ok {
			return makeControlCommand(t)
		}
	case QueryStatusEvent:
		return []qmp.Command{
			{
				Execute: "query-status",
			},
		}
	}
	return make([]qmp.Command, 0)
}

func makeControlCommand(t int) []qmp.Command {
	switch t {
	case ControlEventRestart:
		return []qmp.Command{
			makeHMCommand("system_reset"),
			makeHMCommand("cont"),
		}
	}
	return make([]qmp.Command, 0)
}

func makeHMCommand(cmdTemplate string, args ...any) qmp.Command {
	return qmp.Command{
		Execute: "human-monitor-command",
		Args: CommandLine{
			Command: fmt.Sprintf(cmdTemplate, args...),
		},
	}
}