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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

const std = @import("std");

const sood = @import("sood");

const Self = @This();

allocator: std.mem.Allocator,

pub const CApi = extern struct {
    internal: *Self,

    /// Network address of the server.
    sockaddr: std.posix.sockaddr,
    addrlen: std.posix.socklen_t,

    /// Unique ID of the server. It won't change even on server reboot.
    id: [*:0]const u8,
    id_len: usize,

    /// Display name of the server. Users who can configure the server can change the name.
    name: [*:0]const u8,
    name_len: usize,

    /// Free-format version string.
    version: [*:0]const u8,
    version_len: usize,

    pub fn deinit(self: CApi) void {
        self.internal.allocator.free(self.id[0..self.id_len]);
        self.internal.allocator.free(self.name[0..self.name_len]);
        self.internal.allocator.free(self.version[0..self.version_len]);
        self.internal.allocator.destroy(self.internal);
    }

    pub const FromSoodResponseError = std.mem.Allocator.Error;

    /// This copies slice fields of `response` so `Entry.CApi` can outlive the `response`.
    /// SOOD discovery response is merely a view for received UDP packets: receiving an
    /// another UDP packet or closing/exiting UDP code invalidates underlying buffer, thus
    /// makes a slice field a dangling pointer.
    pub fn fromSoodResponse(
        allocator: std.mem.Allocator,
        addr: std.net.Address,
        response: *const sood.discovery.Response,
    ) FromSoodResponseError!CApi {
        var ip_addr = addr;
        ip_addr.setPort(response.http_port);

        const unique_id = try allocator.dupeZ(u8, response.unique_id);
        errdefer allocator.free(unique_id);

        const name = try allocator.dupeZ(u8, response.name);
        errdefer allocator.free(name);

        const version = try allocator.dupeZ(u8, response.display_version);
        errdefer allocator.free(version);

        const internal = try allocator.create(Self);
        internal.* = .{
            .allocator = allocator,
        };

        return .{
            .internal = internal,
            .sockaddr = ip_addr.any,
            .addrlen = ip_addr.getOsSockLen(),
            .id = unique_id.ptr,
            .id_len = unique_id.len,
            .name = name.ptr,
            .name_len = name.len,
            .version = version.ptr,
            .version_len = version.len,
        };
    }

    pub fn getAddr(self: *const CApi) std.net.Address {
        return std.net.Address.initPosix(&self.sockaddr);
    }

    pub fn getId(self: *const CApi) []const u8 {
        return self.id[0..self.id_len];
    }

    pub fn getName(self: *const CApi) []const u8 {
        return self.name[0..self.name_len];
    }

    pub fn getVersion(self: *const CApi) []const u8 {
        return self.version[0..self.version_len];
    }

    pub fn getKey(self: CApi) []const u8 {
        return self.getVersion();
    }

    pub fn jsonStringify(self: *const CApi, jws: anytype) !void {
        try jws.beginObject();

        try jws.objectField("unique_id");
        try jws.write(self.getId());

        try jws.objectField("name");
        try jws.write(self.getName());

        try jws.objectField("version");
        try jws.write(self.getVersion());

        try jws.objectField("address");
        try jws.print("\"{}\"", .{self.getAddr()});

        try jws.endObject();
    }
};