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// Copyright 2026 Shota FUJI <pockawoooh@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

package timer

import (
	"fmt"
	"time"

	"pocka.jp/x/system/programs/pomodoro/preferences"
)

type Phase interface {
	// DisplayName returns user friendly display name of the phase.
	DisplayName() string

	// Next returns a phase to transition after completing or skipping this phase.
	Next(preferences.Preferences) Phase

	Duration() time.Duration
}

type WorkPhase struct {
	Round uint

	duration time.Duration
}

func (p WorkPhase) DisplayName() string {
	return fmt.Sprintf("Work (#%d)", p.Round)
}

func (p WorkPhase) Next(pref preferences.Preferences) Phase {
	if p.Round >= pref.SessionCount {
		return LongBreakPhase{
			duration: pref.LongBreakDuration,
		}
	} else {
		return ShortBreakPhase{
			Round:    p.Round,
			duration: pref.ShortBreakDuration,
		}
	}
}

func (p WorkPhase) Duration() time.Duration {
	return p.duration
}

func NewWorkPhase(pref preferences.Preferences) WorkPhase {
	return WorkPhase{
		Round:    1,
		duration: pref.WorkDuration,
	}
}

type ShortBreakPhase struct {
	Round uint

	duration time.Duration
}

func (p ShortBreakPhase) DisplayName() string {
	return fmt.Sprintf("Short Break (#%d)", p.Round)
}

func (p ShortBreakPhase) Next(pref preferences.Preferences) Phase {
	return WorkPhase{
		Round:    p.Round + 1,
		duration: pref.WorkDuration,
	}
}

func (p ShortBreakPhase) Duration() time.Duration {
	return p.duration
}

type LongBreakPhase struct {
	duration time.Duration
}

func (p LongBreakPhase) DisplayName() string {
	return "Long Break"
}

func (p LongBreakPhase) Next(pref preferences.Preferences) Phase {
	return WorkPhase{
		Round:    1,
		duration: pref.WorkDuration,
	}
}

func (p LongBreakPhase) Duration() time.Duration {
	return p.duration
}