package tools

import (
	"context"
	"fmt"
	"net/url"
	"strings"

	"github.com/modelcontextprotocol/go-sdk/mcp"
)

// vm_net.go — сетевые интерфейсы ВМ (net0..netN): добавить/обновить/удалить.
// Это структурные изменения конфига → write gate + confirm + probe. Модель
// задаёт iface (net0), модель/бридж; guard валидирует имя интерфейса.

func registerVMNetTools(s *mcp.Server) {
	registerPatternTool(s, &mcp.Tool{
		Name:        "vm_add_network",
		Description: "Add a network interface (netN) to a VM, e.g. net0 via vmbr0. Requires confirm + write permission.",
		InputSchema: schema(map[string]any{
			"node":     strProps("Node name", true),
			"vmid":     strProps("VM ID", true),
			"iface":    strProps("Interface slot (e.g. net0)", true),
			"model":    strProps("NIC model", true, "virtio", "e1000", "vmxnet3", "rtl8139"),
			"bridge":   strProps("Bridge (e.g. vmbr0)", true),
			"mac":      strProps("MAC (empty = auto)", false),
			"firewall": boolProps("Enable firewall (default: true)", false),
			"confirm":  strProps("Set to \"true\" to confirm", true, "true"),
		}, []string{"node", "vmid", "iface", "bridge", "confirm"}),
	}, vmPatterns, vmAddNetworkHandler)

	registerPatternTool(s, &mcp.Tool{
		Name:        "vm_update_network",
		Description: "Update an existing network interface (model/bridge/mac/firewall). Requires confirm + write permission.",
		InputSchema: schema(map[string]any{
			"node":     strProps("Node name", true),
			"vmid":     strProps("VM ID", true),
			"iface":    strProps("Interface slot (e.g. net0)", true),
			"model":    strProps("NIC model", false, "virtio", "e1000", "vmxnet3", "rtl8139"),
			"bridge":   strProps("Bridge (e.g. vmbr0)", false),
			"mac":      strProps("MAC address", false),
			"firewall": boolProps("Enable firewall (default: true)", false),
			"confirm":  strProps("Set to \"true\" to confirm", true, "true"),
		}, []string{"node", "vmid", "iface", "confirm"}),
	}, vmPatterns, vmUpdateNetworkHandler)

	registerPatternTool(s, &mcp.Tool{
		Name:        "vm_remove_network",
		Description: "Remove a network interface from a VM. Requires confirm + write permission.",
		InputSchema: schema(map[string]any{
			"node":    strProps("Node name", true),
			"vmid":    strProps("VM ID", true),
			"iface":   strProps("Interface slot (e.g. net0)", true),
			"confirm": strProps("Set to \"true\" to confirm", true, "true"),
		}, []string{"node", "vmid", "iface", "confirm"}),
	}, vmPatterns, vmRemoveNetworkHandler)
}

func vmAddNetworkHandler(ctx context.Context, req *mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	t, err := tenantFor(ctx, req)
	if err != nil {
		return errorResult(err.Error()), nil
	}
	args := requestArgs(req)
	node, vmid, host, r := resolveVMArgs(t, args)
	if r != nil {
		return r, nil
	}
	if err := confirm(args, "vm_add_network"); err != nil {
		return errorResult(err.Error()), nil
	}
	if err := gateVMWrite(t, host, vmid); err != nil {
		return errorResult(err.Error()), nil
	}
	iface, err := requireName(args, "iface")
	if err != nil {
		return errorResult(err.Error()), nil
	}
	model := getString(args, "model", "virtio")
	bridge := getString(args, "bridge", "")
	if bridge == "" {
		return errorResult("'bridge' is required"), nil
	}
	value := fmt.Sprintf("%s,bridge=%s", model, bridge)
	if mac := getString(args, "mac", ""); mac != "" {
		value += ",mac=" + mac
	}
	if getBool(args, "firewall", true) {
		value += ",firewall=1"
	}
	upid, err := t.ConfigPost(ctx, host, node, vmTypeQEMU, vmid, url.Values{iface: {value}})
	if err != nil {
		return errorResult(err.Error()), nil
	}
	return textResult(upidMsg("vm_add_network", fmt.Sprintf("%s/%d %s", node, vmid, iface), upid)), nil
}

func vmUpdateNetworkHandler(ctx context.Context, req *mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	t, err := tenantFor(ctx, req)
	if err != nil {
		return errorResult(err.Error()), nil
	}
	args := requestArgs(req)
	node, vmid, host, r := resolveVMArgs(t, args)
	if r != nil {
		return r, nil
	}
	if err := confirm(args, "vm_update_network"); err != nil {
		return errorResult(err.Error()), nil
	}
	if err := gateVMWrite(t, host, vmid); err != nil {
		return errorResult(err.Error()), nil
	}
	iface, err := requireName(args, "iface")
	if err != nil {
		return errorResult(err.Error()), nil
	}
	// update перезаписывает весь сетевой спецификатор: собираем из явных полей.
	parts := []string{getString(args, "model", "virtio")}
	if b := getString(args, "bridge", ""); b != "" {
		parts = append(parts, "bridge="+b)
	}
	if m := getString(args, "mac", ""); m != "" {
		parts = append(parts, "mac="+m)
	}
	if getBool(args, "firewall", true) {
		parts = append(parts, "firewall=1")
	}
	upid, err := t.ConfigPost(ctx, host, node, vmTypeQEMU, vmid, url.Values{iface: {strings.Join(parts, ",")}})
	if err != nil {
		return errorResult(err.Error()), nil
	}
	return textResult(upidMsg("vm_update_network", fmt.Sprintf("%s/%d %s", node, vmid, iface), upid)), nil
}

func vmRemoveNetworkHandler(ctx context.Context, req *mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	t, err := tenantFor(ctx, req)
	if err != nil {
		return errorResult(err.Error()), nil
	}
	args := requestArgs(req)
	node, vmid, host, r := resolveVMArgs(t, args)
	if r != nil {
		return r, nil
	}
	if err := confirm(args, "vm_remove_network"); err != nil {
		return errorResult(err.Error()), nil
	}
	if err := gateVMWrite(t, host, vmid); err != nil {
		return errorResult(err.Error()), nil
	}
	iface, err := requireName(args, "iface")
	if err != nil {
		return errorResult(err.Error()), nil
	}
	upid, err := t.ConfigPost(ctx, host, node, vmTypeQEMU, vmid, url.Values{"delete": {iface}})
	if err != nil {
		return errorResult(err.Error()), nil
	}
	return textResult(upidMsg("vm_remove_network", fmt.Sprintf("%s/%d %s", node, vmid, iface), upid)), nil
}