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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 {
    text,
    tsv,
    jsonl,
};

const parser = .{
    .format = clap.parsers.enumeration(OutputFormat),
    .sec = clap.parsers.int(u32, 10),
    .uint = clap.parsers.int(u32, 10),
};

const params = clap.parseParamsComptime(
    \\-h, --help Prints this message to stdout and exits.
    \\-c, --count <uint> How many discovery requests to send.
    \\-w, --wait <sec> Waits <sec> after sending a discovery request.
    \\--header Whether emits header row (only on --format=tsv)
    \\-f, --format <format> Output format.
    \\Available values are:
    \\* text ... Plain text format for human consumption.
    \\* tsv ... TSV (tab-separated values).
    \\* jsonl ... Newline delimited list of JSON documents.
    \\
);

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();

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

    const count = res.args.count orelse 3;
    const wait = res.args.wait orelse 2;

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

    var opts: core.ScanOptions = undefined;
    opts.init();
    opts.count = count;
    opts.receive_window_ms = wait * 1_000;

    const maybe_scanner = core.ServerScanner.make();
    const scanner = maybe_scanner orelse {
        // TODO: Print as error log
        stderr.print("Unable to create a scanner: out of memory\n", .{}) catch {};
        return ExitCode.not_ok;
    };
    defer scanner.free();

    var result = scanner.scan(&opts) orelse {
        // TODO: Print as error log
        stderr.print("Unable to scan: out of memory\n", .{}) catch {};
        return ExitCode.not_ok;
    };
    defer result.free();

    if (result.code != .ok) {
        stderr.print("Failed to scan: {s}\n", .{@tagName(result.code)}) catch {};
        return ExitCode.not_ok;
    }

    switch (res.args.format orelse .text) {
        .text => {
            while (result.next()) |server| {
                stdout.print("ID={s} IP={} VERSION=\"{s}\"\n", .{
                    server.getId(),
                    server.getAddr(),
                    server.getVersion(),
                }) catch {
                    // TODO: Create and return appropriate error code
                    return ExitCode.not_ok;
                };
            }
        },
        .tsv => {
            if (res.args.header > 0) {
                stdout.writeAll("ID\tName\tIP address\tVersion\n") catch {
                    return ExitCode.not_ok;
                };
            }
            while (result.next()) |server| {
                // TODO: Escape tabs from name and version
                stdout.print("{s}\t{s}\t{}\t{s}\n", .{
                    server.getId(),
                    server.getName(),
                    server.getAddr(),
                    server.getVersion(),
                }) catch {
                    // TODO: Create and return appropriate error code
                    return ExitCode.not_ok;
                };
            }
        },
        .jsonl => {
            while (result.next()) |server| {
                stdout.print("{}\n", .{
                    std.json.fmt(server, .{ .whitespace = .minified }),
                }) catch {
                    // TODO: Create and return appropriate error code
                    return ExitCode.not_ok;
                };
            }
        },
    }

    return ExitCode.ok;
}