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// bibiman - a TUI for managing BibLaTeX databases
// Copyright (C) 2024  lukeflo
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
/////

use std::path::PathBuf;

use color_eyre::eyre::Result;
use figment::{
    providers::{Format, Serialized, Toml},
    Figment,
};
use ratatui::style::Color;
use serde::{Deserialize, Serialize};

use crate::cliargs::CLIArgs;

/// Main struct of the config file. Contains substructs/headings in toml
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BibiConfig {
    pub general: General,
    pub colors: Colors,
}

/// Substruct [general] in config.toml
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct General {
    pub bibfiles: Option<Vec<PathBuf>>,
    pub editor: Option<String>,
    pub pdf_opener: String,
    pub url_opener: String,
}

/// Substruct [colors] in config.toml
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct Colors {
    pub main_text_color: Color,
    pub highlight_text_color: Color,
    pub entry_color: Color,
    pub keyword_color: Color,
    pub info_color: Color,
    pub confirm_color: Color,
    pub warn_color: Color,
    pub bar_bg_color: Color,
    pub popup_bg_color: Color,
    pub selected_row_bg_color: Color,
}

impl Default for BibiConfig {
    fn default() -> Self {
        Self {
            general: General {
                bibfiles: None,
                editor: None,
                pdf_opener: select_opener(),
                url_opener: select_opener(),
            },
            colors: Colors {
                main_text_color: Color::Indexed(250),
                highlight_text_color: Color::Indexed(254),
                entry_color: Color::Indexed(36),
                keyword_color: Color::Indexed(101),
                info_color: Color::Indexed(99),
                confirm_color: Color::Indexed(47),
                warn_color: Color::Indexed(124),
                bar_bg_color: Color::Indexed(235),
                popup_bg_color: Color::Indexed(234),
                selected_row_bg_color: Color::Indexed(237),
            },
        }
    }
}

impl BibiConfig {
    pub fn parse_config(args: &CLIArgs) -> Result<BibiConfig> {
        let cfg_file: BibiConfig = if args.cfg_path.is_file() {
            Figment::from(Serialized::defaults(BibiConfig::default()))
                .merge(Toml::file(&args.cfg_path))
                .extract()?
        } else {
            BibiConfig::default()
        };

        Ok(cfg_file)
    }

    /// Activates the default color scheme for light background terminals
    pub fn light_colors(&mut self) {
        self.colors.main_text_color = Color::Indexed(235);
        self.colors.highlight_text_color = Color::Indexed(232);
        self.colors.entry_color = Color::Indexed(23);
        self.colors.keyword_color = Color::Indexed(58);
        self.colors.info_color = Color::Indexed(57);
        self.colors.bar_bg_color = Color::Indexed(144);
        self.colors.popup_bg_color = Color::Indexed(187);
        self.colors.confirm_color = Color::Indexed(22);
        self.colors.selected_row_bg_color = Color::Indexed(107);
    }
}

fn select_opener() -> String {
    match std::env::consts::OS {
        "linux" => String::from("xdg-open"),
        "macos" => String::from("open"),
        "windows" => String::from("start"),
        _ => panic!("Couldn't detect OS for setting correct opener"),
    }
}