package ocrapi

import (
	"context"
	"errors"
	"io"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestClientRecognizePostsMultipartAndParsesSupportedReplies(t *testing.T) {
	for _, testCase := range []struct {
		name        string
		contentType string
		body        string
		want        string
	}{
		{"text", "text/plain", "aB12", "aB12"},
		{"json", "application/json", `{"text":"K9"}`, "K9"},
		{"result", "application/json", `{"result":"Z7"}`, "Z7"},
	} {
		t.Run(testCase.name, func(t *testing.T) {
			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				if r.Method != http.MethodPost || r.URL.Path != "/ocr" {
					t.Fatalf("request = %s %s", r.Method, r.URL.Path)
				}
				file, header, err := r.FormFile("file")
				if err != nil || header.Filename != "captcha.png" {
					t.Fatalf("FormFile() = %v / %#v", err, header)
				}
				content, _ := io.ReadAll(file)
				if string(content) != "image-bytes" {
					t.Fatalf("image content = %q", content)
				}
				w.Header().Set("Content-Type", testCase.contentType)
				_, _ = w.Write([]byte(testCase.body))
			}))
			defer server.Close()
			client, err := NewClient(server.URL+"/ocr", 0)
			if err != nil {
				t.Fatalf("NewClient() error = %v", err)
			}
			actual, err := client.Recognize(context.Background(), []byte("image-bytes"), "image/png")
			if err != nil || actual != testCase.want {
				t.Fatalf("Recognize() = %q, %v", actual, err)
			}
		})
	}
}

func TestClientRecognizeFailsClosed(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Redirect(w, r, "/other", http.StatusFound)
	}))
	defer server.Close()
	client, err := NewClient(server.URL+"/ocr", 0)
	if err != nil {
		t.Fatalf("NewClient() error = %v", err)
	}
	_, err = client.Recognize(context.Background(), []byte("image"), "image/png")
	if !errors.Is(err, ErrServiceInvalid) {
		t.Fatalf("Recognize() error = %v", err)
	}
}