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// Copyright 2026 Shota FUJI
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
//
// SPDX-License-Identifier: MPL-2.0

const std = @import("std");

const errors = @import("../errors.zig");
const timer = @import("../timer.zig");

pub fn writePrintOptionsUsage(writer: *std.Io.Writer) std.Io.Writer.Error!void {
    try writer.writeAll(
        \\-f <FORMAT>, --format <FORMAT>
        \\             Specify output format.
        \\             Available FORMAT is:
        \\             * tsv (default)
        \\             * jsonl
        \\
        \\-c <COLUMNS>, --columns <COLUMNS>
        \\             Comma-separated columns (fields) to output.
        \\             This affects column order and visibility.
        \\             Available COLUMNS are:
        \\             * id
        \\             * title
        \\             * status
        \\             * started
        \\             * stopped
        \\             Every column will be printed if unset.
        \\
        \\-d <DATETIME>, --datetime <DATETIME>
        \\             Specify datetime output format.
        \\             Available DATETIME is:
        \\             * system ... Using system locale and timezone
        \\             * unix   ... UNIX seconds
        \\             Default value is "system" for TSV and "unix"
        \\             for "JSONL".
        \\
    );
}

pub const PrintOptionsBuilder = struct {
    order: ?timer.PrintColumn.Order = null,
    datetime: ?timer.DateTimeFormat = null,
    format: timer.PrintFormat = .tsv,

    pub const HandleResult = enum {
        handled,
        unhandled,
    };

    pub const HandleError = errors.CommandLineError;

    pub fn handle(self: *PrintOptionsBuilder, arg: []const u8, args: *std.process.Args.Iterator) HandleError!HandleResult {
        if (std.mem.eql(u8, "-c", arg) or std.mem.eql(u8, "--columns", arg)) {
            const value = args.next() orelse {
                std.log.err("{s} option requires a value", .{arg});
                return HandleError.InvalidUsage;
            };

            self.order = timer.PrintColumn.Order.parse(value) catch |err| {
                std.log.err("{s} is not a valid option value for {s}: {t}", .{
                    value,
                    arg,
                    err,
                });
                return HandleError.InvalidUsage;
            };

            return .handled;
        }

        if (std.mem.eql(u8, "-f", arg) or std.mem.eql(u8, "--format", arg)) {
            const value = args.next() orelse {
                std.log.err("{s} option requires a value", .{arg});
                return HandleError.InvalidUsage;
            };

            self.format = timer.PrintFormat.parse(value) catch |err| {
                std.log.err("{s} is not a valid option value for {s}: {t}", .{
                    value,
                    arg,
                    err,
                });
                return HandleError.InvalidUsage;
            };

            return .handled;
        }

        if (std.mem.eql(u8, "-d", arg) or std.mem.eql(u8, "--datetime", arg)) {
            const value = args.next() orelse {
                std.log.err("{s} option requires a value", .{arg});
                return HandleError.InvalidUsage;
            };

            self.datetime = timer.DateTimeFormat.parse(value) catch |err| {
                std.log.err("{s} is not a valid option value for {s}: {t}", .{
                    value,
                    arg,
                    err,
                });
                return HandleError.InvalidUsage;
            };

            return .handled;
        }

        return .unhandled;
    }

    pub fn build(self: *const PrintOptionsBuilder) timer.Timer.PrintOptions {
        return .{
            .format = self.format,
            .datetime = self.datetime orelse switch (self.format) {
                .tsv => .system,
                .jsonl => .unix,
            },
            .order = self.order orelse .fixed(&.{ .id, .status, .title, .started, .stopped }),
        };
    }
};