// 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 config::{ConfigError, FileFormat};
use ratatui::style::Color;
use serde::Deserialize;

use crate::cliargs::CLIArgs;

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

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

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

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

impl BibiConfig {
    pub fn parse_config(&mut self, args: &CLIArgs) -> Result<()> {
        if args.cfg_path.is_file() {
            let cfg_file = Self::parse_cfg_file(args)?;

            if let Some(general) = cfg_file.general {
                if let Some(bibfiles) = general.bibfiles {
                    self.general.as_mut().unwrap().bibfiles = Some(bibfiles)
                }
                if let Some(editor) = general.editor {
                    self.general.as_mut().unwrap().editor = Some(editor)
                }
                if let Some(pdf_opener) = general.pdf_opener {
                    self.general.as_mut().unwrap().pdf_opener = Some(pdf_opener)
                }
                if let Some(url_opener) = general.url_opener {
                    self.general.as_mut().unwrap().url_opener = Some(url_opener)
                }
            }

            if let Some(colors) = cfg_file.colors {
                if let Some(main_text_color) = colors.main_text_color {
                    self.colors.as_mut().unwrap().main_text_color = Some(main_text_color)
                }
                if let Some(highlight_text_color) = colors.highlight_text_color {
                    self.colors.as_mut().unwrap().highlight_text_color = Some(highlight_text_color)
                }
                if let Some(entry_color) = colors.entry_color {
                    self.colors.as_mut().unwrap().entry_color = Some(entry_color)
                }
                if let Some(keyword_color) = colors.keyword_color {
                    self.colors.as_mut().unwrap().keyword_color = Some(keyword_color)
                }
                if let Some(info_color) = colors.info_color {
                    self.colors.as_mut().unwrap().info_color = Some(info_color)
                }
                if let Some(confirm_color) = colors.confirm_color {
                    self.colors.as_mut().unwrap().confirm_color = Some(confirm_color)
                }
                if let Some(warn_color) = colors.warn_color {
                    self.colors.as_mut().unwrap().warn_color = Some(warn_color)
                }
                if let Some(bar_bg_color) = colors.bar_bg_color {
                    self.colors.as_mut().unwrap().bar_bg_color = Some(bar_bg_color)
                }
                if let Some(popup_bg_color) = colors.popup_bg_color {
                    self.colors.as_mut().unwrap().popup_bg_color = Some(popup_bg_color)
                }
                if let Some(selected_row_bg_color) = colors.selected_row_bg_color {
                    self.colors.as_mut().unwrap().selected_row_bg_color =
                        Some(selected_row_bg_color)
                }
            }
        }

        Ok(())
    }

    fn parse_cfg_file(args: &CLIArgs) -> Result<Self, ConfigError> {
        let mut cfg = config::Config::builder();
        cfg = cfg.add_source(
            config::File::from(args.cfg_path.clone())
                .format(FileFormat::Toml)
                .required(false),
        );
        cfg.build()?.try_deserialize()
    }

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