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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 toml::Value;
use toml_query::read::TomlValueReadTypeExt;
use toml_query::insert::TomlValueInsertExt;
use chrono::NaiveDateTime;
use chrono::Local;
use chrono::NaiveDate;
use failure::Error;
use failure::Fallible as Result;
use failure::ResultExt;
use failure::err_msg;

use crate::iter::HabitInstanceStoreIdIterator;
use crate::util::IsHabitCheck;
use crate::util::get_string_header_from_entry;
use crate::instance::IsHabitInstance;

use libimagentrylink::linkable::Linkable;
use libimagstore::store::Store;
use libimagstore::store::FileLockEntry;
use libimagstore::store::Entry;
use libimagstore::storeid::StoreId;
use libimagstore::storeid::StoreIdIterator;
use libimagentryutil::isa::Is;
use libimagentryutil::isa::IsKindHeaderPathProvider;
use libimagutil::date::date_to_string;

/// A HabitTemplate is a "template" of a habit. A user may define a habit "Eat vegetable".
/// If the user ate a vegetable, she should create a HabitInstance from the Habit with the
/// appropriate date (and optionally a comment) set.
pub trait HabitTemplate : Sized {

    /// Create an instance from this habit template
    ///
    /// By default creates an instance with the name of the template, the current time and the
    /// current date and copies the comment from the template to the instance.
    ///
    /// It uses `Store::retrieve()` underneath. So if there is already an instance for the day
    /// passed, this will simply return the instance.
    fn create_instance_with_date<'a>(&mut self, store: &'a Store, date: NaiveDate)
        -> Result<FileLockEntry<'a>>;

    /// Shortcut for calling `Self::create_instance_with_date()` with an instance of
    /// `::chrono::Local::today().naive_local()`.
    fn create_instance_today<'a>(&mut self, store: &'a Store) -> Result<FileLockEntry<'a>>;

    /// Same as `HabitTemplate::create_instance_with_date()` but uses `Store::retrieve` internally.
    fn retrieve_instance_with_date<'a>(&mut self, store: &'a Store, date: NaiveDate)
        -> Result<FileLockEntry<'a>>;

    /// Same as `HabitTemplate::create_instance_today()` but uses `Store::retrieve` internally.
    fn retrieve_instance_today<'a>(&mut self, store: &'a Store) -> Result<FileLockEntry<'a>>;

    /// Get instances for this template
    fn linked_instances(&self) -> Result<HabitInstanceStoreIdIterator>;

    /// Get the date of the next date when the habit should be done
    fn next_instance_date_after(&self, base: &NaiveDateTime) -> Result<Option<NaiveDate>>;

    /// Get the date of the next date when the habit should be done
    fn next_instance_date(&self) -> Result<Option<NaiveDate>>;

    /// Check whether the instance is a habit by checking its headers for the habit data
    fn is_habit_template(&self) -> Result<bool>;

    fn habit_name(&self) -> Result<String>;
    fn habit_basedate(&self) -> Result<String>;
    fn habit_recur_spec(&self) -> Result<String>;
    fn habit_comment(&self) -> Result<String>;
    fn habit_until_date(&self) -> Result<Option<String>>;

    fn instance_exists_for_date(&self, date: NaiveDate) -> Result<bool>;

    /// Create a StoreId for a habit name and a date the habit should be instantiated for
    fn instance_id_for(habit_name: &str, habit_date: NaiveDate) -> Result<StoreId>;
}

provide_kindflag_path!(pub IsHabitTemplate, "habit.template.is_habit_template");

impl HabitTemplate for Entry {

    fn create_instance_with_date<'a>(&mut self, store: &'a Store, date: NaiveDate) -> Result<FileLockEntry<'a>> {
        let name    = self.habit_name()?;
        let date    = date_to_string(date);
        let id      = instance_id_for_name_and_datestr(&name, &date)?;

        store.create(id)
            .map_err(From::from)
            .and_then(|entry| postprocess_instance(entry, name, date, self))
    }

    fn create_instance_today<'a>(&mut self, store: &'a Store) -> Result<FileLockEntry<'a>> {
        self.create_instance_with_date(store, Local::today().naive_local())
    }

    fn retrieve_instance_with_date<'a>(&mut self, store: &'a Store, date: NaiveDate) -> Result<FileLockEntry<'a>> {
        let name    = self.habit_name()?;
        let date    = date_to_string(date);
        let id      = instance_id_for_name_and_datestr(&name, &date)?;

        store.retrieve(id)
            .map_err(From::from)
            .and_then(|entry| postprocess_instance(entry, name, date, self))
    }

    fn retrieve_instance_today<'a>(&mut self, store: &'a Store) -> Result<FileLockEntry<'a>> {
        self.retrieve_instance_with_date(store, Local::today().naive_local())
    }

    fn linked_instances(&self) -> Result<HabitInstanceStoreIdIterator> {
        let iter = self
            .links()?
            .map(|link| link.get_store_id().clone())
            .filter(IsHabitCheck::is_habit_instance)
            .map(Ok);

        let sidi = StoreIdIterator::new(Box::new(iter));
        Ok(HabitInstanceStoreIdIterator::new(sidi))
    }

    fn next_instance_date_after(&self, base: &NaiveDateTime) -> Result<Option<NaiveDate>> {
        use kairos::timetype::TimeType;
        use kairos::parser::parse;
        use kairos::parser::Parsed;
        use kairos::iter::extensions::Every;

        let date_from_s = |r: String| -> Result<TimeType> {
            match parse(&r)? {
                Parsed::TimeType(tt) => Ok(tt),
                Parsed::Iterator(_) => {
                    Err(format_err!("'{}' yields an iterator. Cannot use.", r))
                },
            }
        };

        debug!("Base is {:?}", base);

        let basedate  = date_from_s(self.habit_basedate()?)?;
        debug!("Basedate is {:?}", basedate);

        let increment = date_from_s(self.habit_recur_spec()?)?;
        debug!("Increment is {:?}", increment);

        let until = self.habit_until_date()?.map(|s| -> Result<_> {
            date_from_s(s)?
                .calculate()?
                .get_moment()
                .map(Clone::clone)
                .ok_or_else(|| err_msg("until-date seems to have non-date value"))
        });

        debug!("Until-Date is {:?}", basedate);

        for element in basedate.every(increment)? {
            debug!("Calculating: {:?}", element);
            let element = element?.calculate()?;
            debug!(" = {:?}", element);
            if let Some(ndt) = element.get_moment() {
                if ndt >= base {
                    debug!("-> {:?} >= {:?}", ndt, base);
                    if let Some(u) = until {
                        if *ndt > u? {
                            return Ok(None);
                        } else {
                            return Ok(Some(ndt.date()));
                        }
                    } else {
                        return Ok(Some(ndt.date()));
                    }
                }
            } else {
                return Err(err_msg("Iterator seems to return bogus values."));
            }
        }

        unreachable!() // until we have habit-end-date support
    }

    /// Get the date of the next date when the habit should be done
    fn next_instance_date(&self) -> Result<Option<NaiveDate>> {
        use kairos::timetype::TimeType;

        let today = TimeType::today();
        let today = today.get_moment().unwrap(); // we know this is safe.
        debug!("Today is {:?}", today);

        self.next_instance_date_after(&today.date().and_hms(0, 0, 0))
    }

    /// Check whether the instance is a habit by checking its headers for the habit data
    fn is_habit_template(&self) -> Result<bool> {
        self.