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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2019 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

use clap::ArgMatches;
use chrono::NaiveDateTime;
use chrono::Local;
use chrono::Timelike;
use failure::Error;
use failure::ResultExt;
use failure::err_msg;
use failure::Fallible as Result;

use libimagdiary::diary::Diary;
use libimagentryedit::edit::Edit;
use libimagrt::runtime::Runtime;
use libimagutil::debug_option::DebugOption;
use libimagstore::store::FileLockEntry;
use libimagstore::store::Store;

use crate::util::get_diary_name;
use crate::util::get_diary_timed_config;
use crate::util::Timed;

pub fn create(rt: &Runtime) -> Result<()> {
    let diaryname = get_diary_name(rt)
        .ok_or_else(|| err_msg("No diary selected. Use either the configuration file or the commandline option"))?;

    let mut entry = create_entry(rt.store(), &diaryname, rt)?;
    rt.report_touched(entry.get_location())?;

    if rt.cli().subcommand_matches("create").unwrap().is_present("no-edit") {
        debug!("Not editing new diary entry");
        info!("Ok!");
        Ok(())
    } else {
        debug!("Editing new diary entry");
        entry.edit_content(rt).context(err_msg("Diary edit error")).map_err(Error::from)
    }
}

fn create_entry<'a>(diary: &'a Store, diaryname: &str, rt: &Runtime) -> Result<FileLockEntry<'a>> {
    use crate::util::parse_timed_string;

    let create = rt.cli().subcommand_matches("create").unwrap();

    let timed = match create.value_of("timed").map(|t| parse_timed_string(t, diaryname)) {
        Some(t) => t.map(Some),
        None => get_diary_timed_config(rt, diaryname)
    }?;

    if let Some(timed) = timed {
        let time = create_id_from_clispec(&create, timed)?;
        diary.new_entry_at(&diaryname, &time)
            .context(err_msg("Store write error"))
            .map_err(Error::from)
    } else {
        debug!("Creating non-timed entry");
        diary.new_entry_today(diaryname)
    }
}


fn create_id_from_clispec(create: &ArgMatches, timed_type: Timed) -> Result<NaiveDateTime> {
    use std::str::FromStr;

    let dt  = Local::now();
    let ndt = dt.naive_local();

    match timed_type {
        Timed::Daily => {
            debug!("Creating daily-timed entry");
            Ok(ndt.with_hour(0)
                .unwrap() // safe because hour = 0 is safe
                .with_minute(0)
                .unwrap() // safe because minute = 0 is safe
                .with_second(0)
                .unwrap()) // safe because second = 0 is safe
        },
        Timed::Hourly => {
            debug!("Creating hourly-timed entry");
            Ok(ndt.with_minute(0)
                .unwrap() // safe because minute = 0 is safe
                .with_second(0)
                .unwrap()) // safe because second = 0 is safe
        },

        Timed::Minutely => {
            let min = create
                .value_of("minute")
                .map_dbg(|m| format!("minute = {:?}", m))
                .map(|s| {
                    FromStr::from_str(s)
                        .map_err(Error::from)
                        .context(format_err!("Could not parse minute: '{}'", s))
                        .map_err(Error::from)
                })
                .transpose()?
                .unwrap_or_else(|| ndt.minute());

            ndt.with_minute(min)
                .ok_or_else(|| {
                    format_err!("Cannot set {} as minute, would yield invalid time!", min)
                })
                .map(|ndt| ndt.with_second(0).unwrap()) // safe because second = 0 is safe
        },

        Timed::Secondly => {
            let min = create
                .value_of("minute")
                .map_dbg(|m| format!("minute = {:?}", m))
                .map(|s| {
                    FromStr::from_str(s)
                        .map_err(Error::from)
                        .context(format_err!("Could not parse minute: '{}'", s))
                        .map_err(Error::from)
                })
                .transpose()?
                .unwrap_or_else(|| ndt.minute());

            let sec = create
                .value_of("second")
                .map_dbg(|s| format!("second = {:?}", s))
                .map(|s| {
                    FromStr::from_str(s)
                        .map_err(Error::from)
                        .context(format_err!("Could not parse second: '{}'", s))
                        .map_err(Error::from)
                })
                .transpose()?
                .unwrap_or_else(|| ndt.second());

            ndt.with_minute(min)
                .ok_or_else(|| {
                    format_err!("Cannot set {} as minute, would yield invalid time!", min)
                })?
                .with_second(sec)
                .ok_or_else(|| {
                    format_err!("Cannot set {} as second, would yield invalid time!", sec)
                })
        },
    }
}