use chrono::{DateTime, Datelike, Utc};
use chrono_tz::US::Central;
use clap::Parser;
use log::{debug, error};
use reqwest::blocking::Client;
use serde::{Deserialize, Serialize};
use std::path::PathBuf;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // --- Loading and setup ---
    let args = CliArgs::parse();

    simplelog::SimpleLogger::init(
        match args.debug {
            true => simplelog::LevelFilter::Debug,
            false => simplelog::LevelFilter::Info,
        },
        simplelog::Config::default(),
    )?;

    debug!("Opening Config file: {}", args.config_file.display());
    debug!(
        "Config file exists: {}",
        std::fs::metadata(&args.config_file).is_ok()
    );

    let file_contents = match std::fs::read_to_string(&args.config_file) {
        Ok(val) => val,
        Err(e) => {
            error!("Could not read config file: {e}");
            panic!("{e}");
        }
    };

    let cfg: Config = match toml::from_str(&file_contents) {
        Ok(val) => val,
        Err(e) => {
            error!("Could not parse config file: {e}");
            panic!("{e}");
        }
    };
    // --- END Loading and setup ---

    // --- Get checked and unchecked ---
    let primary_note = Client::new()
        .get(format!(
            "https://{}/index.php/apps/notes/api/v1/notes/{}",
            &cfg.server_url, &cfg.primary_note_id
        ))
        .header("Accept", "application/json")
        .header("Content-Type", "application/json")
        .basic_auth(&cfg.user, Some(&cfg.pswd))
        .send()?
        .json::<Note>()?;

    let primary_note_lines: Vec<&str> = primary_note.content.lines().collect();

    let mut unchecked: Vec<String> = vec![];
    let mut checked: Vec<String> = vec![];

    for line in primary_note_lines.iter() {
        // if line is a checkbox
        if line.starts_with("- [") {
            if line.starts_with("- [ ] ") {
                unchecked.push(line.replace("- [ ] ", ""));
            } else if line.starts_with("- [x] ") {
                checked.push(line.replace("- [x] ", ""));
            }
        }
    }

    // --- END Get checked and unchecked ---

    // --- Get current log ---
    let logging_note = Client::new()
        .get(format!(
            "https://{}/index.php/apps/notes/api/v1/notes/{}",
            &cfg.server_url, &cfg.logging_note_id
        ))
        .header("Accept", "application/json")
        .header("Content-Type", "application/json")
        .basic_auth(&cfg.user, Some(&cfg.pswd))
        .send()?
        .json::<Note>()?;

    let now = Utc::now().with_timezone(&Central);

    let mut body_content: Vec<String> = vec![format!(
        "*Last Updated:* {} Central Time",
        now.format("%D - %H:%M:%S")
    )];

    let logging_note_lines: Vec<&str> = logging_note.content.lines().collect();

    for line in logging_note_lines {
        if line.starts_with("*Last Updated") {
            continue;
        }
        if line.starts_with("# ") {
            body_content.push(line.to_string());
            continue;
        }
        if line.starts_with("### ") {
            body_content.push(line.to_string());
            continue;
        }

        // --- Assume it is a started log ---
        let split: Vec<&str> = line.split('|').collect();

        let item = match split.first() {
            Some(val) => val,
            None => {
                error!("Couldn't split correctly, item 1");
                panic!("Couldn't split correctly, item 1");
            }
        }
        .replace('#', "")
        .trim()
        .to_string();

        if unchecked.contains(&item) {
            let timestamp = match split.get(1) {
                Some(val) => val,
                None => {
                    error!("Couldn't split correctly, item 2");
                    panic!("Couldn't split correctly, item 2");
                }
            };
            let start_time = match DateTime::parse_from_rfc2822(timestamp) {
                Ok(val) => val.with_timezone(&Central),
                Err(e) => {
                    error!("Error parsing time: '{timestamp}' : {e}");
                    panic!("Error parsing time: '{timestamp}' : {e}");
                }
            };

            let elapsed_time: chrono::Duration = now - start_time;

            body_content.push(format!(
                "### {item} | {}h {}m | {}/{}/{}",
                elapsed_time.num_hours(),
                elapsed_time.num_minutes(),
                now.month(),
                now.day(),
                now.year()
            ));
        } else {
            if line != "" {
                body_content.push(line.to_string());
            }
        }
        checked.retain(|val| val != &item);
    }

    checked = checked
        .into_iter()
        .map(|val| {
            format!(
                "## {val} | {}",
                Utc::now().with_timezone(&Central).to_rfc2822()
            )
        })
        .collect();

    debug!("checked: {:#?}", checked);
    debug!("unchecked: {:#?}", unchecked);

    body_content.splice(2..2, checked);

    debug!("{:#?}", body_content);

    Client::new()
        .put(format!(
            "https://{}/index.php/apps/notes/api/v1/notes/{}",
            &cfg.server_url, &cfg.logging_note_id
        ))
        .header("Accept", "application/json")
        .header("Content-Type", "application/json")
        .basic_auth(&cfg.user, Some(&cfg.pswd))
        .body(serde_json::to_string(&NoteUpdate {
            content: body_content.join("\n"),
        })?)
        .send()?;

    Ok(())
}

#[derive(Serialize, Deserialize, Debug)]
struct Note {
    id: usize,
    etag: String,
    readonly: bool,
    modified: u64,
    title: String,
    category: String,
    content: String,
    favorite: bool,
}

#[derive(Serialize, Deserialize, Debug)]
struct NoteUpdate {
    content: String,
}

#[derive(Serialize, Deserialize, Default)]
struct Config {
    user: String,
    pswd: String,
    primary_note_id: String,
    logging_note_id: String,
    server_url: String,
}

#[derive(Parser, Debug)]
#[command(author, version, about, long_about=None)]
struct CliArgs {
    /// Path to config .toml file
    #[arg(short, long)]
    config_file: PathBuf,

    #[arg(short, long)]
    debug: bool,
}