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

// Tool: set_layout_field
// Replaces the content of a global layout field (style or javascript) in the
// project's layout.json. Destructive — overwrites the existing content. The
// backend enforces a 500KB size limit and returns 400 if exceeded; that error
// is propagated via handleToolError.

export function registerSetLayoutFieldTool(server) {
    server.tool(
        "set_layout_field",
        `Replace the content of a global layout field. 'style'/'javascript' are simple string fields injected via CDN-like URLs (no regeneration needed). 'header'/'footer' are more complex: saving them triggers a server-side pipeline that regenerates the compiled PHP, Twig module files, and TWIG-compiled templates — changes are visible immediately. Destructive: overwrites existing content. Prefer reading with get_layout_field first.`,
        withAuthParams({
            field: z.enum(["style", "javascript", "header", "footer"]).describe("Which layout field: 'style', 'javascript', 'header' or 'footer'"),
            content: z.string().describe("Full replacement content. Max 500KB."),
        }),
        { readOnlyHint: false, destructiveHint: true },
        withAuth(async ({ field, content }, _extra) => {
            try {
                const { projectSlug } = getCurrentProjectInfo();
                const result = await pythonPost("/api/project/layout-field/save", {
                    project: projectSlug,
                    field,
                    content,
                });
                if (!result?.success) {
                    return {
                        content: [{
                            type: "text",
                            text: JSON.stringify({
                                success: false,
                                error: result?.error || "Could not save layout field",
                            }),
                        }],
                        isError: true,
                    };
                }
                return {
                    content: [{
                        type: "text",
                        text: JSON.stringify({
                            success: true,
                            field: result.field || field,
                        }, null, 2),
                    }],
                };
            } catch (error) {
                return handleToolError(error, "set_layout_field", {
                    field,
                    contentLength: typeof content === "string" ? content.length : 0,
                });
            }
        })
    );
}