import { z } from "zod";
import { handleToolError, validateRequired } from "../helpers/errorHandler.js";
import { getCurrentProjectInfo, callLocalFileEndpoint, buildLocalFileErrorResponse } from "./helpers.js";

export function registerAcaiViewTool(server) {
    server.tool(
        "acai-view",
        "Read a project file with optional line ranges. Returns only the requested slice plus compact metadata for safe incremental edits.",
        {
            file_path: z.string().describe("Path relative to the project root"),
            start_line: z.number().int().positive().optional().describe("1-indexed start line. Defaults to 1."),
            end_line: z.number().int().positive().optional().describe("1-indexed end line. If omitted, the server returns a bounded chunk."),
        },
        { readOnlyHint: true, destructiveHint: false },
        async ({ file_path, start_line, end_line }) => {
            try {
                const validationError = validateRequired({ file_path }, ["file_path"], "acai-view");
                if (validationError) return validationError;

                if (end_line !== undefined && start_line !== undefined && end_line < start_line) {
                    return {
                        content: [{ type: "text", text: JSON.stringify({ success: false, error: "end_line must be greater than or equal to start_line" }, null, 2) }],
                        isError: true,
                    };
                }

                const { projectSlug } = getCurrentProjectInfo();
                const result = await callLocalFileEndpoint("GET", "/api/files/read", null, {
                    project: projectSlug,
                    projectDir: getCurrentProjectInfo().projectDir,
                    relativePath: file_path,
                    startLine: start_line,
                    endLine: end_line,
                });
                if (!result.data?.success) {
                    return buildLocalFileErrorResponse("acai-view", result, { file_path });
                }
                const data = result.data;

                return {
                    content: [{
                        type: "text",
                        text: JSON.stringify({
                            success: true,
                            file_path: data.filePath,
                            start_line: data.startLine,
                            end_line: data.endLine,
                            total_lines: data.totalLines,
                            sha256: data.sha256,
                            content: data.content,
                            truncated: data.truncated,
                        }, null, 2),
                    }],
                };
            } catch (error) {
                return handleToolError(error, "acai-view", { file_path });
            }
        }
    );
}