5 files changed, 491 insertions, 0 deletions
diff --git a/lib/auth.go b/lib/auth.go
new file mode 100644
index 0000000..b5bc06a
--- /dev/null
+++ b/lib/auth.go
@@ -0,0 +1,111 @@
+package lib
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os/exec"
+	"runtime"
+	"strings"
+	"yato/config"
+)
+
+func GetNewCodeVerifier() (string, error) {
+	bytes := make([]byte, 100)
+	_, err := rand.Read(bytes)
+	if err != nil {
+		return "", fmt.Errorf("failed to generate code verifier: %w", err)
+	}
+
+	encoded := base64.RawURLEncoding.EncodeToString(bytes)
+
+	// Truncate to 128 characters
+	if len(encoded) > 128 {
+		encoded = encoded[:128]
+	}
+
+	return encoded, nil
+}
+
+func GetOAuthURL(codeVerifier string) string {
+	return fmt.Sprintf("%s?response_type=code&client_id=%s&redirect_uri=%s&code_challenge=%s&code_challenge_method=plain",
+		config.MALOAuthBaseURL, config.MALClientID, config.MALRedirectURI, codeVerifier)
+}
+
+func OpenBrowser(url string) error {
+	var err error
+
+	switch runtime.GOOS {
+	case "linux":
+		err = exec.Command("xdg-open", url).Start()
+	case "windows":
+		err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
+	case "darwin":
+		err = exec.Command("open", url).Start()
+	default:
+		err = fmt.Errorf("unsupported platform")
+	}
+
+	return err
+}
+
+func ExchangeToken(code, codeVerifier string) (*config.MyAnimeListConfig, error) {
+	data := url.Values{}
+	data.Set("grant_type", "authorization_code")
+	data.Set("client_id", config.MALClientID)
+	data.Set("client_secret", config.MALClientSecret)
+	data.Set("redirect_uri", config.MALRedirectURI)
+	data.Set("code", code)
+
+	if codeVerifier != "" {
+		data.Set("code_verifier", codeVerifier)
+	}
+
+	// POST request to MAL API
+	req, err := http.NewRequest("POST", "https://myanimelist.net/v1/oauth2/token", strings.NewReader(data.Encode()))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	var malConfig config.MyAnimeListConfig
+	var tokenResponse struct {
+		TokenType    string `json:"token_type"`
+		ExpiresIn    int    `json:"expires_in"`
+		AccessToken  string `json:"access_token"`
+		RefreshToken string `json:"refresh_token"`
+	}
+
+	if err := json.Unmarshal(body, &tokenResponse); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
+	}
+
+	malConfig.TokenType = tokenResponse.TokenType
+	malConfig.ExpiresIn = tokenResponse.ExpiresIn
+	malConfig.AccessToken = tokenResponse.AccessToken
+	malConfig.RefreshToken = tokenResponse.RefreshToken
+
+	return &malConfig, nil
+}
diff --git a/lib/image_cache.go b/lib/image_cache.go
new file mode 100644
index 0000000..58cd09b
--- /dev/null
+++ b/lib/image_cache.go
@@ -0,0 +1,98 @@
+package lib
+
+import (
+	"fmt"
+	"image"
+	"image/jpeg"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"yato/config"
+)
+
+// ImageCache handles caching and retrieving images
+type ImageCache struct {
+	cacheDir string
+}
+
+// NewImageCache creates a new ImageCache
+func NewImageCache() *ImageCache {
+	cacheDir := filepath.Join(config.ConfigDir, config.AppName, "cache")
+	return &ImageCache{cacheDir: cacheDir}
+}
+
+// GetImage retrieves an image, either from cache or by downloading it
+func (c *ImageCache) GetImage(mediaType string, malID int, size string, url string) (image.Image, error) {
+	cachePath := c.getCachePath(mediaType, malID, size)
+
+	// Check if the image is already cached
+	if img, err := c.loadFromCache(cachePath); err == nil {
+		return img, nil
+	}
+
+	// If not cached, download and cache the image
+	return c.downloadAndCache(url, cachePath)
+}
+
+func (c *ImageCache) getCachePath(mediaType string, malID int, size string) string {
+	return filepath.Join(c.cacheDir, mediaType, fmt.Sprintf("%d", malID), size+".jpg")
+}
+
+func (c *ImageCache) loadFromCache(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	img, err := jpeg.Decode(file)
+	if err != nil {
+		return nil, err
+	}
+
+	return img, nil
+}
+
+func (c *ImageCache) downloadAndCache(url, cachePath string) (image.Image, error) {
+	resp, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("failed to download image: %s", resp.Status)
+	}
+
+	// Ensure the cache directory exists
+	if err := os.MkdirAll(filepath.Dir(cachePath), 0755); err != nil {
+		return nil, err
+	}
+
+	// Create the cache file
+	cacheFile, err := os.Create(cachePath)
+	if err != nil {
+		return nil, err
+	}
+	defer cacheFile.Close()
+
+	// Download and write to cache file
+	_, err = io.Copy(cacheFile, resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	// Reset file pointer and decode the image
+	_, err = cacheFile.Seek(0, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	img, err := jpeg.Decode(cacheFile)
+	if err != nil {
+		return nil, err
+	}
+
+	return img, nil
+}
diff --git a/lib/image_renderer.go b/lib/image_renderer.go
new file mode 100644
index 0000000..03a8059
--- /dev/null
+++ b/lib/image_renderer.go
@@ -0,0 +1,158 @@
+package lib
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"image"
+	"image/color"
+	"image/jpeg"
+	"image/png"
+	"os"
+	"strings"
+
+	"golang.org/x/image/draw"
+)
+
+type ImageRenderer struct {
+	method string
+}
+
+func NewImageRenderer() *ImageRenderer {
+	method := determineRenderMethod()
+	return &ImageRenderer{method: method}
+}
+
+func determineRenderMethod() string {
+	if os.Getenv("TERM") == "xterm-kitty" {
+		return "kitty"
+	} else if os.Getenv("TERM_PROGRAM") == "iTerm.app" {
+		return "iterm2"
+	} else if os.Getenv("TERM") == "xterm-256color" && os.Getenv("VTE_VERSION") != "" {
+		return "sixel"
+	}
+	return "none"
+}
+
+func (r *ImageRenderer) RenderImage(img image.Image, width, height int) string {
+	switch r.method {
+	case "kitty":
+		return r.renderKitty(img, width, height)
+	case "iterm2":
+		return r.renderITerm2(img, width, height)
+	case "sixel":
+		return r.renderSixel(img, width, height)
+	case "ascii":
+		return r.renderASCII(img, width, height)
+	default:
+		return ""
+	}
+}
+
+func (r *ImageRenderer) renderKitty(img image.Image, width, height int) string {
+	resized := image.NewRGBA(image.Rect(0, 0, width, height))
+	draw.NearestNeighbor.Scale(resized, resized.Rect, img, img.Bounds(), draw.Over, nil)
+
+	var buf bytes.Buffer
+	png.Encode(&buf, resized)
+	encoded := base64.StdEncoding.EncodeToString(buf.Bytes())
+
+	// Split the encoded data into chunks
+	const chunkSize = 4096
+	chunks := make([]string, 0, (len(encoded)+chunkSize-1)/chunkSize)
+	for i := 0; i < len(encoded); i += chunkSize {
+		end := i + chunkSize
+		if end > len(encoded) {
+			end = len(encoded)
+		}
+		chunks = append(chunks, encoded[i:end])
+	}
+
+	// Build the Kitty graphics protocol command
+	var result strings.Builder
+	for i, chunk := range chunks {
+		if i == 0 {
+			result.WriteString(fmt.Sprintf("\033_Ga=T,f=100,s=%d,v=%d,m=1;", width, height))
+		} else {
+			result.WriteString("\033_Gm=1;")
+		}
+		result.WriteString(chunk)
+		result.WriteString("\033\\")
+	}
+
+	// Final chunk
+	result.WriteString("\033_Gm=0;\033\\")
+
+	return result.String()
+}
+
+func (r *ImageRenderer) renderITerm2(img image.Image, width, height int) string {
+	// Implement iTerm2 inline image protocol
+	var buf bytes.Buffer
+	jpeg.Encode(&buf, img, nil)
+	encoded := base64.StdEncoding.EncodeToString(buf.Bytes())
+	return fmt.Sprintf("\033]1337;File=inline=1;width=%dpx;height=%dpx:%s\a", width, height, encoded)
+}
+
+func (r *ImageRenderer) renderSixel(img image.Image, width, height int) string {
+	resized := image.NewRGBA(image.Rect(0, 0, width, height))
+	draw.NearestNeighbor.Scale(resized, resized.Rect, img, img.Bounds(), draw.Over, nil)
+
+	// Convert to Sixel
+	var sb strings.Builder
+	sb.WriteString("\033Pq") // Start Sixel sequence
+	sb.WriteString("\"1;1;") // Set color mode and aspect ratio
+	sb.WriteString(fmt.Sprintf("%d;%d", width, height))
+	sb.WriteString("\n")
+
+	// Simple color quantization (this can be improved)
+	palette := make(map[color.Color]int)
+	colorIndex := 0
+
+	for y := 0; y < height; y++ {
+		sixelRow := make([]int, width)
+		for x := 0; x < width; x++ {
+			c := resized.At(x, y)
+			if _, exists := palette[c]; !exists {
+				palette[c] = colorIndex
+				colorIndex++
+				r, g, b, _ := c.RGBA()
+				sb.WriteString(fmt.Sprintf("#%d;2;%d;%d;%d", palette[c], r>>8, g>>8, b>>8))
+			}
+			sixelRow[x] = palette[c]
+		}
+
+		// Encode sixel data
+		for i := 0; i < 6; i++ {
+			for _, colorIdx := range sixelRow {
+				sb.WriteByte(byte('?' + ((colorIdx >> i) & 1)))
+			}
+			sb.WriteByte('-')
+		}
+		sb.WriteByte('\n')
+	}
+
+	sb.WriteString("\033\\") // End Sixel sequence
+	return sb.String()
+}
+
+func (r *ImageRenderer) renderASCII(img image.Image, width, height int) string {
+	// Implement a simple ASCII art renderer
+	// This is a very basic implementation and can be improved
+	bounds := img.Bounds()
+	ascii := ""
+	for y := bounds.Min.Y; y < bounds.Max.Y; y += height / 10 {
+		for x := bounds.Min.X; x < bounds.Max.X; x += width / 20 {
+			c := img.At(x, y)
+			r, g, b, _ := c.RGBA()
+			avg := (r + g + b) / 3
+			if avg > 32768 {
+				ascii += " "
+			} else {
+				ascii += "#"
+			}
+		}
+		ascii += "\n"
+	}
+	return ascii
+}
diff --git a/lib/recommendations.go b/lib/recommendations.go
new file mode 100644
index 0000000..6875a1f
--- /dev/null
+++ b/lib/recommendations.go
@@ -0,0 +1,79 @@
+package lib
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"yato/config"
+)
+
+type Recommendation struct {
+	MALId string `json:"mal_id"`
+	URL   string `json:"url"`
+	Entry []struct {
+		MALId  int    `json:"mal_id"`
+		URL    string `json:"url"`
+		Images struct {
+			JPG struct {
+				ImageURL      string `json:"image_url"`
+				SmallImageURL string `json:"small_image_url"`
+				LargeImageURL string `json:"large_image_url"`
+			} `json:"jpg"`
+			WebP struct {
+				ImageURL      string `json:"image_url"`
+				SmallImageURL string `json:"small_image_url"`
+				LargeImageURL string `json:"large_image_url"`
+			} `json:"webp"`
+		} `json:"images"`
+		Title string `json:"title"`
+	} `json:"entry"`
+	Content string `json:"content"`
+	Date    string `json:"date"`
+	User    struct {
+		URL      string `json:"url"`
+		Username string `json:"username"`
+	} `json:"user"`
+}
+
+type recommendationsResponse struct {
+	Pagination struct {
+		LastVisiblePage int  `json:"last_visible_page"`
+		HasNextPage     bool `json:"has_next_page"`
+	} `json:"pagination"`
+	Data []Recommendation `json:"data"`
+}
+
+func getRecentRecommendations(mediaType string) ([]Recommendation, error) {
+	url := fmt.Sprintf("%s/recommendations/%s", config.JikanAPIBaseURL, mediaType)
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	var response recommendationsResponse
+	if err := json.NewDecoder(resp.Body).Decode(&response); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	return response.Data, nil
+}
+
+func GetRecentAnimeRecommendations() ([]Recommendation, error) {
+	return getRecentRecommendations("anime")
+}
+
+func GetRecentMangaRecommendations() ([]Recommendation, error) {
+	return getRecentRecommendations("manga")
+}
diff --git a/lib/user.go b/lib/user.go
new file mode 100644
index 0000000..cbfde00
--- /dev/null
+++ b/lib/user.go
@@ -0,0 +1,45 @@
+package lib
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"yato/config"
+)
+
+type MALUser struct {
+	ID       int    `json:"id"`
+	Name     string `json:"name"`
+	Birthday string `json:"birthday"`
+	Location string `json:"location"`
+	JoinedAt string `json:"joined_at"`
+	Picture  string `json:"picture"`
+}
+
+func CurrentUser() (*MALUser, error) {
+	var user MALUser
+
+	req, err := http.NewRequest("GET", "https://api.myanimelist.net/v2/users/@me", nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", config.GetConfig().MyAnimeList.AccessToken))
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	if err := json.NewDecoder(resp.Body).Decode(&user); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	return &user, nil
+}