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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 clap = @import("clap");
const core = @import("core");

const cb = @import("../cb.zig");
const path = @import("../path.zig");
const ExitCode = @import("../exit.zig").ExitCode;

const parsers = .{
    .server_id = clap.parsers.string,
};

const params = clap.parseParamsComptime(
    \\-h, --help Prints this message to stdout and exits.
    \\<server_id>
    \\
);

pub fn run(allocator: std.mem.Allocator, iter: *std.process.ArgIterator) ExitCode {
    var diag = clap.Diagnostic{};
    var res = clap.parseEx(clap.Help, &params, parsers, iter, .{
        .diagnostic = &diag,
        .allocator = allocator,
    }) catch |err| {
        diag.report(std.io.getStdErr().writer(), err) catch {};
        return ExitCode.incorrect_usage;
    };
    defer res.deinit();

    if (res.args.help > 0) {
        clap.help(std.io.getStdOut().writer(), clap.Help, &params, .{}) catch {
            return ExitCode.stdout_write_failed;
        };
        return ExitCode.ok;
    }

    const server_id: []const u8 = res.positionals[0] orelse {
        std.log.err("server_id is required", .{});
        clap.help(std.io.getStdErr().writer(), clap.Help, &params, .{}) catch {
            return ExitCode.stdout_write_failed;
        };
        return ExitCode.incorrect_usage;
    };

    var app = core.App.CApi.new() orelse {
        std.log.err("Unable to create an app: out of memory", .{});
        return ExitCode.out_of_memory;
    };
    defer app.destroy();

    const state_file_path = path.getStateFilePath(allocator) catch |err| {
        std.log.err("Unable to resolve state file path: {s}", .{@errorName(err)});
        return ExitCode.not_ok;
    };
    defer allocator.free(state_file_path);

    app.setStatePath(state_file_path.ptr, state_file_path.len);

    const OnConnectionChange = cb.Callback(struct {});
    var on_connection_change = OnConnectionChange.init();

    app.onConnectionChange(OnConnectionChange.function, on_connection_change.userdata());

    const server_id_z = allocator.dupeZ(u8, server_id) catch {
        std.log.err("Unable to allocate CString for server ID: out of memory", .{});
        return ExitCode.out_of_memory;
    };
    defer allocator.free(server_id_z);

    app.connect(server_id_z.ptr, server_id_z.len, null, 0);

    while (true) {
        on_connection_change.wait();

        switch (app.connection) {
            core.App.CApi.ConnectionState.busy => continue,
            core.App.CApi.ConnectionState.idle => break,
            else => {
                std.log.err("Unable to connect: {s}", .{@tagName(app.connection)});
                return ExitCode.not_ok;
            },
        }
    }

    if (app.server) |server| {
        std.log.info("Connected to {s}", .{server.name});
        return ExitCode.ok;
    } else {
        std.log.err("Unable to connect to {s} (server = null)", .{server_id});
        return ExitCode.not_ok;
    }
}