movies/movies.go

package movies

import (
	"encoding/json"
	"fmt"
	"strconv"
	"strings"
)

type Movie struct {
	Title    string
	Director string
	Poster   string
	Rating   *Rating
	IMDBID   string

	OMDB OMDBMovie
}

type Rating struct {
	Note  float64
	Votes int64
}

type OMDBMovie struct {
	Title      string
	Year       string
	Rated      string
	Released   string
	Runtime    string
	Genre      string
	Director   string
	Writer     string
	Actors     string
	Plot       string
	Language   string
	Country    string
	Awards     string
	Poster     string
	Ratings    []OMDBRating
	Metascore  string
	IMDBRating string `json: "imdbRating"`
	IMDBVotes  string `json: "imdbVotes"`
	IMDBID     string `json: "imdbID"`
	Type       string
	DVD        string
	BoxOffice  string
	Production string
	Website    string
	Response   string
}

type OMDBRating struct {
	Source, Value string
}

func Unmarshal(b []byte) (*Movie, error) {
	var omdb OMDBMovie
	if err := json.Unmarshal(b, &omdb); err != nil {
		return nil, err
	}

	m := &Movie{
		OMDB: omdb,
	}

	if err := m.FillFromOMDB(); err != nil {
		return nil, err
	}

	return m, nil
}

func (m *Movie) FillFromOMDB() error {
	if m.Title == "" {
		m.Title = m.OMDB.Title
	}
	if m.Director == "" {
		m.Director = m.OMDB.Director
	}
	if m.Poster == "" {
		m.Poster = m.OMDB.Poster
	}
	if m.IMDBID == "" {
		m.IMDBID = m.OMDB.IMDBID
	}

	if m.Rating == nil {
		note, err := strconv.ParseFloat(m.OMDB.IMDBRating, 64)
		if err != nil {
			return fmt.Errorf("cannot convert %q to float64: %w", m.OMDB.IMDBRating, err)
		}

		votes, err := strconv.ParseInt(strings.ReplaceAll(m.OMDB.IMDBVotes, ",", ""), 10, 64)
		if err != nil {
			return fmt.Errorf("cannot convert %q to int: %w", m.OMDB.IMDBVotes, err)
		}

		m.Rating = &Rating{
			Note:  note,
			Votes: votes,
		}
	}

	return nil
}