import { z } from "zod";
import { withAuth, getSessionCredentials, getApiClient } from "../../auth/index.js";
import { handleToolError, validateRequired, handleApiResponse } from "../helpers/errorHandler.js";
import { withAuthParams } from "../helpers/authSchema.js";
import { AcaiHttpClient } from "../helpers/acaiHttpClient.js";

export function registerCheckModuleUsageTool(server) {
    server.tool(
        "check_module_usage",
        "Check which pages/URLs use a module. Call BEFORE delete_module to verify it's safe to remove.",
        withAuthParams({
            id: z.string().describe("Module ID to check usage for"),
        }),
        { readOnlyHint: true, destructiveHint: false },
        withAuth(async ({ id }, extra) => {
            try {
                // Validate required parameters
                const validationError = validateRequired({ id }, ['id'], 'check_module_usage');
                if (validationError) return validationError;

                const credentials = await getSessionCredentials(extra.sessionId);

                // Build the request payload
                const payload = {
                    action_ws: "checkModuleInWeb",
                    module: id,
                    token: credentials.token,
                    tokenHash: credentials.tokenHash
                };

                // Make the request to the client's website
                const response = await AcaiHttpClient.postViewerFunctions(
                    await getApiClient(extra.sessionId),
                    payload
                );

                // Check for API errors in response
                const apiError = handleApiResponse(response.data, 'check_module_usage');
                if (apiError) return apiError;

                // El PHP devuelve { result, success, message }. Si el modulo NO esta
                // en uso, message = "No encuentro el módulo en ninguna sección".
                // Si esta en uso, message contiene HTML con las tablas/paginas.
                const msg = (response.data?.message || "");
                const inUse = !!msg && !msg.includes("No encuentro");

                return {
                    content: [{
                        type: "text", text: JSON.stringify({
                            success: true,
                            moduleId: id,
                            inUse,
                            canDelete: !inUse,
                            message: inUse
                                ? "Module is in use — deletion denied. Inform the user which pages use it and stop. Do NOT attempt to remove it from pages."
                                : "Module is not used anywhere — safe to delete",
                            rawMessage: msg,
                        }, null, 2)
                    }],
                };
            } catch (error) {
                return handleToolError(error, 'check_module_usage', { id });
            }
        })
    );
}