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// SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

const std = @import("std");

const ping_request = @import("./proto/yamori/meta/v1/ping_request.proto.zig");
const ping_response = @import("./proto/yamori/meta/v1/ping_response.proto.zig");

const Core = @This();

allocator: std.mem.Allocator,

pub const HandleError = error{
    UnknownService,
    UnknownMethod,
    DecodeError,
    EncodeError,
};

pub fn init(allocator: std.mem.Allocator) Core {
    var core: Core = undefined;
    core.populate(allocator);
    return core;
}

pub fn populate(core: *Core, allocator: std.mem.Allocator) void {
    core.allocator = allocator;
}

pub fn handle(
    self: *const Core,
    service: []const u8,
    method: []const u8,
    bytes: []const u8,
) HandleError![]const u8 {
    var arena = std.heap.ArenaAllocator.init(self.allocator);
    defer arena.deinit();

    const allocator = arena.allocator();

    if (std.mem.eql(u8, service, "yamori.meta.v1")) {
        if (std.mem.eql(u8, method, "Ping")) {
            _ = ping_request.PingRequestReader.init(allocator, bytes) catch {
                return HandleError.DecodeError;
            };

            return ping_response.PingResponse.encode(&.{}, self.allocator) catch {
                return HandleError.EncodeError;
            };
        }

        return HandleError.UnknownMethod;
    }

    return HandleError.UnknownService;
}