package starnet

import (
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestRequestAddFileStream(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		err := r.ParseMultipartForm(10 << 20) // 10 MB
		if err != nil {
			t.Fatalf("ParseMultipartForm error: %v", err)
		}

		file, header, err := r.FormFile("file")
		if err != nil {
			t.Fatalf("FormFile error: %v", err)
		}
		defer file.Close()

		content, _ := io.ReadAll(file)
		w.Write([]byte(header.Filename + ":" + string(content)))
	}))
	defer server.Close()

	fileContent := "test file content"
	reader := strings.NewReader(fileContent)

	req := NewSimpleRequest(server.URL, "POST").
		AddFileStream("file", "test.txt", int64(len(fileContent)), reader)

	resp, err := req.Do()
	if err != nil {
		t.Fatalf("Do() error: %v", err)
	}
	defer resp.Close()

	body, _ := resp.Body().String()
	expected := "test.txt:" + fileContent
	if body != expected {
		t.Errorf("Body = %v; want %v", body, expected)
	}
}

func TestRequestAddFileWithFormData(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		err := r.ParseMultipartForm(10 << 20)
		if err != nil {
			t.Fatalf("ParseMultipartForm error: %v", err)
		}

		// Check form field
		name := r.FormValue("name")
		if name != "John" {
			t.Errorf("name = %v; want John", name)
		}

		// Check file
		file, header, err := r.FormFile("file")
		if err != nil {
			t.Fatalf("FormFile error: %v", err)
		}
		defer file.Close()

		w.Write([]byte("OK:" + header.Filename))
	}))
	defer server.Close()

	fileContent := "file data"
	reader := strings.NewReader(fileContent)

	req := NewSimpleRequest(server.URL, "POST").
		AddFormData("name", "John").
		AddFileStream("file", "document.txt", int64(len(fileContent)), reader)

	resp, err := req.Do()
	if err != nil {
		t.Fatalf("Do() error: %v", err)
	}
	defer resp.Close()

	body, _ := resp.Body().String()
	if !strings.Contains(body, "document.txt") {
		t.Errorf("Body should contain filename, got: %v", body)
	}
}

func TestRequestUploadProgress(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		r.ParseMultipartForm(10 << 20)
		w.WriteHeader(http.StatusOK)
	}))
	defer server.Close()

	progressCalled := false
	var lastUploaded int64

	fileContent := strings.Repeat("a", 1024*10) // 10KB
	reader := strings.NewReader(fileContent)

	req := NewSimpleRequest(server.URL, "POST").
		SetUploadProgress(func(filename string, uploaded, total int64) {
			progressCalled = true
			lastUploaded = uploaded
			if filename != "test.txt" {
				t.Errorf("filename = %v; want test.txt", filename)
			}
		}).
		AddFileStream("file", "test.txt", int64(len(fileContent)), reader)

	resp, err := req.Do()
	if err != nil {
		t.Fatalf("Do() error: %v", err)
	}
	defer resp.Close()

	if !progressCalled {
		t.Error("Progress callback was not called")
	}

	if lastUploaded != int64(len(fileContent)) {
		t.Errorf("lastUploaded = %v; want %v", lastUploaded, len(fileContent))
	}
}

// TestRequestAddFileFromDisk tests uploading a real file from disk
func TestRequestAddFileFromDisk(t *testing.T) {
	// Create a temporary file
	tmpDir := t.TempDir()
	tmpFile := filepath.Join(tmpDir, "test.txt")
	fileContent := []byte("test file content from disk")

	err := os.WriteFile(tmpFile, fileContent, 0644)
	if err != nil {
		t.Fatalf("WriteFile error: %v", err)
	}

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		err := r.ParseMultipartForm(10 << 20)
		if err != nil {
			t.Fatalf("ParseMultipartForm error: %v", err)
		}

		file, header, err := r.FormFile("file")
		if err != nil {
			t.Fatalf("FormFile error: %v", err)
		}
		defer file.Close()

		content, _ := io.ReadAll(file)
		w.Write([]byte(header.Filename + ":" + string(content)))
	}))
	defer server.Close()

	req := NewSimpleRequest(server.URL, "POST").AddFile("file", tmpFile)

	resp, err := req.Do()
	if err != nil {
		t.Fatalf("Do() error: %v", err)
	}
	defer resp.Close()

	body, _ := resp.Body().String()
	if !strings.Contains(body, string(fileContent)) {
		t.Errorf("Body should contain file content, got: %v", body)
	}
}