package companion

import (
	"context"
	"errors"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"

	core "github.com/yuxingu/digital-psychology/apps/api/internal/companion"
	"github.com/yuxingu/digital-psychology/apps/api/internal/model"
	"github.com/yuxingu/digital-psychology/apps/api/internal/repository"
	"github.com/yuxingu/digital-psychology/apps/api/internal/textsafe"
)

// Service exposes solar terms and moods.
type Service struct {
	Moods *repository.MoodRepo
}

// TodaySolar returns today's tip.
func (s *Service) TodaySolar() core.SolarTerm {
	return core.TodaySolar(time.Now())
}

// SaveMoodInput for POST /moods.
type SaveMoodInput struct {
	Score *int
	Note  *string
	Day   *time.Time
}

// SaveMood upserts mood for a day (default today).
func (s *Service) SaveMood(ctx context.Context, userID uuid.UUID, in SaveMoodInput) (*model.Mood, error) {
	if in.Score != nil && (*in.Score < 1 || *in.Score > 5) {
		return nil, errors.New("score must be 1-5")
	}
	if in.Note != nil {
		n, err := textsafe.Check(textsafe.Note, *in.Note)
		if err != nil {
			return nil, err
		}
		if n == "" {
			in.Note = nil
		} else {
			in.Note = &n
		}
	}
	day := time.Now()
	if in.Day != nil {
		day = *in.Day
	}
	return s.Moods.UpsertToday(ctx, userID, day, in.Score, in.Note)
}

// GetTodayMood returns today's mood or nil when none.
func (s *Service) GetTodayMood(ctx context.Context, userID uuid.UUID) (*model.Mood, error) {
	m, err := s.Moods.GetToday(ctx, userID, time.Now())
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, nil
		}
		return nil, err
	}
	return m, nil
}