package main

import (
	"context"

	"github.com/mark3labs/mcp-go/mcp"
	"github.com/mark3labs/mcp-go/server"

	"fn-registry/functions/browser"
)

// registerStorageTools wires storage_save (read) + storage_load (MUTA).
func registerStorageTools(s *server.MCPServer, d *deps) {
	s.AddTool(storageSaveTool(), mcp.NewTypedToolHandler(d.handleStorageSave))

	if !d.readOnly {
		s.AddTool(storageLoadTool(), mcp.NewTypedToolHandler(d.handleStorageLoad))
	}
}

// ---- storage_save ----

type storageSaveArgs struct {
	Port int    `json:"port"`
	Path string `json:"path"`
}

func storageSaveTool() mcp.Tool {
	return mcp.NewTool("storage_save",
		mcp.WithDescription("Save the current session storage state (cookies + localStorage) to a JSON file for later reuse."),
		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
		mcp.WithString("path", mcp.Required(), mcp.Description("Output JSON file path.")),
	)
}

func (d *deps) handleStorageSave(_ context.Context, _ mcp.CallToolRequest, a storageSaveArgs) (*mcp.CallToolResult, error) {
	if a.Path == "" {
		return mcp.NewToolResultError("path is required"), nil
	}
	err := d.withConn(portOr(a.Port), func(c *browser.CDPConn) error {
		return browser.CdpSaveStorageState(c, a.Path)
	})
	if err != nil {
		return mcp.NewToolResultError(err.Error()), nil
	}
	return mcp.NewToolResultText("storage state saved to " + a.Path), nil
}

// ---- storage_load (MUTA) ----

type storageLoadArgs struct {
	Port int    `json:"port"`
	Path string `json:"path"`
}

func storageLoadTool() mcp.Tool {
	return mcp.NewTool("storage_load",
		mcp.WithDescription("Load a previously saved session storage state (cookies + localStorage) from a JSON file into the live browser."),
		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
		mcp.WithString("path", mcp.Required(), mcp.Description("Input JSON file path.")),
	)
}

func (d *deps) handleStorageLoad(_ context.Context, _ mcp.CallToolRequest, a storageLoadArgs) (*mcp.CallToolResult, error) {
	if a.Path == "" {
		return mcp.NewToolResultError("path is required"), nil
	}
	err := d.withConn(portOr(a.Port), func(c *browser.CDPConn) error {
		return browser.CdpLoadStorageState(c, a.Path)
	})
	if err != nil {
		return mcp.NewToolResultError(err.Error()), nil
	}
	return mcp.NewToolResultText("storage state loaded from " + a.Path), nil
}