package episode

import (
	"context"
	"errors"
	"time"
)

var (
	ErrNotFound         = errors.New("episode not found")
	ErrInvalidStartTime = errors.New("invalid start_time (expected HH:MM:SS)")
	ErrInvalidPlayback  = errors.New("invalid playback_length (expected HH:MM:SS and > 00:00:00)")
	ErrInvalidShowInput = errors.New("invalid show payload")
	ErrEmptyIDs         = errors.New("ids must not be empty")
)

// Episode represents a single show/episode in the system.
type Episode struct {
	Id             int       `json:"id"`
	EpNum          int       `json:"ep_num"`
	EpTitle        string    `json:"ep_title"`
	SeasonName     string    `json:"season_name"`
	StartTime      string    `json:"start_time"`
	PlaybackLength string    `json:"playback_length"`
	CurrentEp      bool      `json:"current_ep"`
	DateCreated    time.Time `json:"date_created"`
}

// ArchiveEpisode represents a row in the current_archive table.
type ArchiveEpisode struct {
	Id             int       `json:"id"`
	EpNum          int       `json:"ep_num"`
	EpTitle        string    `json:"ep_title"`
	SeasonName     string    `json:"season_name"`
	StartTime      string    `json:"start_time"`
	PlaybackLength string    `json:"playback_length"`
	CurrentEp      bool      `json:"current_ep"`
	DateCreated    time.Time `json:"date_created"`
	DateArchived   time.Time `json:"date_archived"`
}

// NewShowInput is the payload needed to create a new show/episode.
type NewShowInput struct {
	EpNum          int    `json:"ep_num"`
	EpTitle        string `json:"ep_title"`
	SeasonName     string `json:"season_name"`
	StartTime      string `json:"start_time"`
	PlaybackLength string `json:"playback_length"`
}

// MoveResult describes what happened during an archive move operation.
type MoveResult struct {
	MovedIDs   []int64
	DeletedIDs []int64
	SkippedIDs []int64
}

// Repository is the storage port that the application layer depends on.
type Repository interface {
	GetCurrent(ctx context.Context) (Episode, error)
	SetCurrent(ctx context.Context, id int64, startHHMMSS string) error
	Create(ctx context.Context, in NewShowInput) (Episode, error)
	MoveToArchive(ctx context.Context, ids []int64) (MoveResult, error)
	ListAll(ctx context.Context) ([]Episode, error)
	ListArchive(ctx context.Context) ([]ArchiveEpisode, error)
	Delete(ctx context.Context, id int64) error
}