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// yt - A fully featured command line YouTube client
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Yt.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.

use std::fmt::Write;

use chrono::{Local, TimeZone};
use chrono_humanize::{Accuracy, HumanTime, Tense};

use crate::comments::comment::CommentExt;

use super::comment::Comments;

impl Comments {
    pub fn render(&self, color: bool) -> String {
        self.render_help(color).expect("This should never fail.")
    }

    fn render_help(&self, color: bool) -> Result<String, std::fmt::Error> {
        let mut f = String::new();

        macro_rules! c {
            ($color_str:expr, $write:ident, $color:expr) => {
                if $color {
                    $write.write_str(concat!("\x1b[", $color_str, "m"))?
                }
            };
        }

        fn format(
            comment: &CommentExt,
            f: &mut String,
            ident_count: u32,
            color: bool,
        ) -> std::fmt::Result {
            let ident = &(0..ident_count).map(|_| " ").collect::<String>();
            let value = &comment.value;

            f.write_str(ident)?;

            if value.author_is_uploader {
                c!("91;1", f, color);
            } else {
                c!("35", f, color);
            }

            f.write_str(&value.author)?;
            c!("0", f, color);
            if value.edited || value.is_favorited {
                f.write_str("[")?;
                if value.edited {
                    f.write_str("")?;
                }
                if value.edited && value.is_favorited {
                    f.write_str(" ")?;
                }
                if value.is_favorited {
                    f.write_str("")?;
                }
                f.write_str("]")?;
            }

            c!("36;1", f, color);
            write!(
                f,
                " {}",
                HumanTime::from(
                    Local
                        .timestamp_opt(value.timestamp, 0)
                        .single()
                        .expect("This should be valid")
                )
                .to_text_en(Accuracy::Rough, Tense::Past)
            )?;
            c!("0", f, color);

            // c!("31;1", f);
            // f.write_fmt(format_args!(" [{}]", comment.value.like_count))?;
            // c!("0", f);

            f.write_str(":\n")?;
            f.write_str(ident)?;

            f.write_str(&value.text.replace('\n', &format!("\n{}", ident)))?;
            f.write_str("\n")?;

            if !comment.replies.is_empty() {
                let mut children = comment.replies.clone();
                children.sort_by(|a, b| a.value.timestamp.cmp(&b.value.timestamp));

                for child in children {
                    format(&child, f, ident_count + 4, color)?;
                }
            } else {
                f.write_str("\n")?;
            }

            Ok(())
        }

        if !&self.vec.is_empty() {
            let mut children = self.vec.clone();
            children.sort_by(|a, b| b.value.like_count.cmp(&a.value.like_count));

            for child in children {
                format(&child, &mut f, 0, color)?
            }
        }
        Ok(f)
    }
}