package repository

import (
	"context"
	"errors"

	dbgen "Yimaru-Backend/gen/db"
	"Yimaru-Backend/internal/domain"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgtype"
)

func programToDomain(p dbgen.Program) domain.Program {
	out := domain.Program{
		ID:   p.ID,
		Name: p.Name,
	}
	out.Description = fromPgText(p.Description)
	out.Thumbnail = fromPgText(p.Thumbnail)
	out.CreatedAt = p.CreatedAt.Time
	if p.UpdatedAt.Valid {
		t := p.UpdatedAt.Time
		out.UpdatedAt = &t
	}
	return out
}

func (s *Store) CreateProgram(ctx context.Context, input domain.CreateProgramInput) (domain.Program, error) {
	p, err := s.queries.CreateProgram(ctx, dbgen.CreateProgramParams{
		Name:        input.Name,
		Description: toPgText(input.Description),
		Thumbnail:   toPgText(input.Thumbnail),
	})
	if err != nil {
		return domain.Program{}, err
	}
	return programToDomain(p), nil
}

func (s *Store) GetProgramByID(ctx context.Context, id int64) (domain.Program, error) {
	p, err := s.queries.GetProgramByID(ctx, id)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return domain.Program{}, pgx.ErrNoRows
		}
		return domain.Program{}, err
	}
	return programToDomain(p), nil
}

func (s *Store) ListPrograms(ctx context.Context, limit, offset int32) ([]domain.Program, int64, error) {
	rows, err := s.queries.ListPrograms(ctx, dbgen.ListProgramsParams{
		Limit:  limit,
		Offset: offset,
	})
	if err != nil {
		return nil, 0, err
	}
	if len(rows) == 0 {
		return []domain.Program{}, 0, nil
	}
	var total int64
	out := make([]domain.Program, 0, len(rows))
	for i, r := range rows {
		if i == 0 {
			total = r.TotalCount
		}
		out = append(out, programToDomain(dbgen.Program{
			ID:          r.ID,
			Name:        r.Name,
			Description: r.Description,
			Thumbnail:   r.Thumbnail,
			CreatedAt:   r.CreatedAt,
			UpdatedAt:   r.UpdatedAt,
		}))
	}
	return out, total, nil
}

func optionalTextUpdate(val *string) pgtype.Text {
	if val == nil {
		return pgtype.Text{Valid: false}
	}
	return pgtype.Text{String: *val, Valid: true}
}

func (s *Store) UpdateProgram(ctx context.Context, id int64, input domain.UpdateProgramInput) (domain.Program, error) {
	var nameText pgtype.Text
	if input.Name != nil {
		nameText = pgtype.Text{String: *input.Name, Valid: true}
	} else {
		nameText = pgtype.Text{Valid: false}
	}
	p, err := s.queries.UpdateProgram(ctx, dbgen.UpdateProgramParams{
		ID:          id,
		Name:        nameText,
		Description: optionalTextUpdate(input.Description),
		Thumbnail:   optionalTextUpdate(input.Thumbnail),
	})
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return domain.Program{}, pgx.ErrNoRows
		}
		return domain.Program{}, err
	}
	return programToDomain(p), nil
}

func (s *Store) DeleteProgram(ctx context.Context, id int64) error {
	return s.queries.DeleteProgram(ctx, id)
}