import { z } from "zod";
import { withAuth } from "../../auth/index.js";
import { withAuthParams } from "../helpers/authSchema.js";
import { handleToolError } from "../helpers/errorHandler.js";
import { pythonGet } from "../helpers/pythonServerClient.js";
import { getCurrentProjectInfo } from "../files/helpers.js";

// Tool: get_layout_field
// Reads a global layout field (style or javascript) from the project's layout.json
// via the Python endpoint. Read-only — delegates to the backend which parses
// layout.json and returns the raw content string plus layoutExists flag.

export function registerGetLayoutFieldTool(server) {
    server.tool(
        "get_layout_field",
        `Get the content of a global layout field of the project. Supported: 'style' (global CSS injected in all pages), 'javascript' (global JS), 'header' (HTML/Twig source of the site header), 'footer' (HTML/Twig source of the site footer). Use this before set_layout_field to see the current content.`,
        withAuthParams({
            field: z.enum(["style", "javascript", "header", "footer"]).describe("Which layout field: 'style', 'javascript', 'header' or 'footer'"),
        }),
        { readOnlyHint: true, destructiveHint: false },
        withAuth(async ({ field }, _extra) => {
            try {
                const { projectSlug } = getCurrentProjectInfo();
                const result = await pythonGet("/api/project/layout-field", {
                    project: projectSlug,
                    field,
                });
                if (!result?.success) {
                    return {
                        content: [{
                            type: "text",
                            text: JSON.stringify({
                                success: false,
                                error: result?.error || "Could not read layout field",
                            }),
                        }],
                        isError: true,
                    };
                }
                return {
                    content: [{
                        type: "text",
                        text: JSON.stringify({
                            success: true,
                            field: result.field || field,
                            content: result.content || "",
                            layoutExists: !!result.layoutExists,
                        }, null, 2),
                    }],
                };
            } catch (error) {
                return handleToolError(error, "get_layout_field", { field });
            }
        })
    );
}