feat: add tvmaze api client

integrations/tvmaze/client.go

@@ -0,0 +1,164 @@
+package tvmaze
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+)
+
+const baseURL = "https://api.tvmaze.com"
+
+type Client struct {
+	httpClient *http.Client
+	baseURL    string
+}
+
+type searchResult struct {
+	Show show `json:"show"`
+}
+
+type show struct {
+	ID   int    `json:"id"`
+	Name string `json:"name"`
+	Type string `json:"type"`
+}
+
+type episode struct {
+	Name string `json:"name"`
+}
+
+func NewClient() *Client {
+	return &Client{
+		httpClient: &http.Client{Timeout: 5 * time.Second},
+		baseURL:    baseURL,
+	}
+}
+
+func (c *Client) Name() string {
+	return "TVmaze"
+}
+
+func (c *Client) ResolveEpisodeProviderID(ctx context.Context, _ int, titleCandidates []string) (string, error) {
+	matches := map[int]struct{}{}
+	for _, candidate := range uniqueTitleCandidates(titleCandidates, 4) {
+		results, err := c.search(ctx, candidate)
+		if err != nil {
+			return "", err
+		}
+		addExactMatches(matches, results, normalizeTitle(candidate))
+		if len(matches) == 1 {
+			for id := range matches {
+				return strconv.Itoa(id), nil
+			}
+		}
+	}
+
+	if len(matches) > 1 {
+		return "", errors.New("tvmaze: multiple exact show matches")
+	}
+	return "", errors.New("tvmaze: no exact show match")
+}
+
+func uniqueTitleCandidates(candidates []string, limit int) []string {
+	seen := map[string]struct{}{}
+	unique := make([]string, 0, min(len(candidates), limit))
+	for _, candidate := range candidates {
+		normalized := normalizeTitle(candidate)
+		if normalized == "" {
+			continue
+		}
+		if _, ok := seen[normalized]; ok {
+			continue
+		}
+		seen[normalized] = struct{}{}
+		unique = append(unique, candidate)
+		if len(unique) == limit {
+			break
+		}
+	}
+	return unique
+}
+
+func addExactMatches(matches map[int]struct{}, results []searchResult, normalizedTitle string) {
+	for _, result := range results {
+		if result.Show.ID <= 0 || normalizeTitle(result.Show.Name) != normalizedTitle {
+			continue
+		}
+		if result.Show.Type != "" && !strings.EqualFold(result.Show.Type, "Animation") {
+			continue
+		}
+		matches[result.Show.ID] = struct{}{}
+	}
+}
+
+func (c *Client) GetEpisodeTitlesByProviderID(ctx context.Context, providerID string) (map[int]string, error) {
+	var episodes []episode
+	if err := c.getJSON(ctx, "/shows/"+url.PathEscape(providerID)+"/episodes", &episodes); err != nil {
+		return nil, err
+	}
+
+	titles := make(map[int]string, len(episodes))
+	for i, item := range episodes {
+		title := strings.TrimSpace(item.Name)
+		if title != "" {
+			titles[i+1] = title
+		}
+	}
+	if len(titles) == 0 {
+		return nil, errors.New("tvmaze: show has no episode titles")
+	}
+	return titles, nil
+}
+
+func (c *Client) search(ctx context.Context, title string) ([]searchResult, error) {
+	var results []searchResult
+	err := c.getJSON(ctx, "/search/shows?q="+url.QueryEscape(title), &results)
+	return results, err
+}
+
+func (c *Client) getJSON(ctx context.Context, path string, target any) error {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.apiURL()+path, nil)
+	if err != nil {
+		return fmt.Errorf("tvmaze: create request: %w", err)
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("User-Agent", "mal/1.0")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("tvmaze: request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("tvmaze: status %d", resp.StatusCode)
+	}
+	if err := json.NewDecoder(io.LimitReader(resp.Body, 2<<20)).Decode(target); err != nil {
+		return fmt.Errorf("tvmaze: decode response: %w", err)
+	}
+	return nil
+}
+
+func (c *Client) apiURL() string {
+	if c.baseURL != "" {
+		return c.baseURL
+	}
+	return baseURL
+}
+
+func normalizeTitle(value string) string {
+	return strings.Map(func(r rune) rune {
+		if unicode.IsLetter(r) || unicode.IsNumber(r) {
+			return unicode.ToLower(r)
+		}
+		return -1
+	}, strings.TrimSpace(value))
+}