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

const OutputFormat = enum {
    address,
    text,
    json,
};

const parser = .{
    .format = clap.parsers.enumeration(OutputFormat),
    .server_id = clap.parsers.string,
};

const params = clap.parseParamsComptime(
    \\-h, --help Prints this message to stdout and exits.
    \\-f, --format <format> Output format.
    \\Available values are:
    \\* address ... Only display an IP address and port number.
    \\* text ... Plain text format for human consumption.
    \\* json ... A JSON object.
    \\<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, parser, iter, .{
        .diagnostic = &diag,
        .allocator = allocator,
    }) catch |err| {
        diag.report(std.io.getStdErr().writer(), err) catch {};
        return ExitCode.incorrect_usage;
    };
    defer res.deinit();

    const stdout = std.io.getStdOut().writer();
    const stderr = std.io.getStdErr().writer();

    if (res.args.help > 0) {
        clap.help(stdout, clap.Help, &params, .{}) catch {};
        return ExitCode.ok;
    }

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

    const scanner = core.server.ServerScanner.make() orelse {
        std.log.err("Unable to create a scanner: out of memory", .{});
        // TODO: Create dedicated exit code.
        return ExitCode.not_ok;
    };
    defer scanner.free();

    const server_id_cstr = allocator.dupeZ(u8, server_id) catch {
        std.log.err("Unable to find server: out of memory", .{});
        // TODO: Create dedicated exit code.
        return ExitCode.not_ok;
    };
    defer allocator.free(server_id_cstr);

    var result = scanner.find(server_id_cstr.ptr, server_id_cstr.len) orelse {
        std.log.err("Unable to find server: out of memory", .{});
        // TODO: Create dedicated exit code.
        return ExitCode.not_ok;
    };
    defer result.free();

    if (result.code != .ok) {
        std.log.err("Failed to find server: {s}", .{@tagName(result.code)});
        return ExitCode.not_ok;
    }

    const found = result.server orelse {
        std.log.err("Server not found", .{});
        // TODO: Create dedicated exit code.
        return ExitCode.not_ok;
    };

    switch (res.args.format orelse .address) {
        .address => {
            stdout.print("{}\n", .{found.getAddr()}) catch {
                return ExitCode.not_ok;
            };
        },
        .text => {
            stdout.print("ID={s} IP={} VERSION=\"{s}\"\n", .{
                found.getId(),
                found.getAddr(),
                found.getVersion(),
            }) catch {
                // TODO: Create and return appropriate error code
                return ExitCode.not_ok;
            };
        },
        .json => {
            stdout.print("{}\n", .{
                std.json.fmt(found, .{ .whitespace = .minified }),
            }) catch {
                // TODO: Create and return appropriate error code
                return ExitCode.not_ok;
            };
        },
    }

    return ExitCode.ok;
}