package openai //nolint:testpackage // testing private field

import (
	utils "github.com/sashabaranov/go-openai/internal"
	"github.com/sashabaranov/go-openai/internal/test/checks"

	"context"
	"fmt"
	"io"
	"os"
	"testing"
)

type mockFormBuilder struct {
	mockCreateFormFile       func(string, *os.File) error
	mockCreateFormFileReader func(string, io.Reader, string) error
	mockWriteField           func(string, string) error
	mockClose                func() error
}

func (fb *mockFormBuilder) CreateFormFile(fieldname string, file *os.File) error {
	return fb.mockCreateFormFile(fieldname, file)
}

func (fb *mockFormBuilder) CreateFormFileReader(fieldname string, r io.Reader, filename string) error {
	return fb.mockCreateFormFileReader(fieldname, r, filename)
}

func (fb *mockFormBuilder) WriteField(fieldname, value string) error {
	return fb.mockWriteField(fieldname, value)
}

func (fb *mockFormBuilder) Close() error {
	return fb.mockClose()
}

func (fb *mockFormBuilder) FormDataContentType() string {
	return ""
}

func TestImageFormBuilderFailures(t *testing.T) {
	config := DefaultConfig("")
	config.BaseURL = ""
	client := NewClientWithConfig(config)

	mockBuilder := &mockFormBuilder{}
	client.createFormBuilder = func(io.Writer) utils.FormBuilder {
		return mockBuilder
	}
	ctx := context.Background()

	req := ImageEditRequest{
		Mask: &os.File{},
	}

	mockFailedErr := fmt.Errorf("mock form builder fail")
	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
		return mockFailedErr
	}
	_, err := client.CreateEditImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")

	mockBuilder.mockCreateFormFile = func(name string, _ *os.File) error {
		if name == "mask" {
			return mockFailedErr
		}
		return nil
	}
	_, err = client.CreateEditImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")

	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
		return nil
	}

	var failForField string
	mockBuilder.mockWriteField = func(fieldname, _ string) error {
		if fieldname == failForField {
			return mockFailedErr
		}
		return nil
	}

	failForField = "prompt"
	_, err = client.CreateEditImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")

	failForField = "n"
	_, err = client.CreateEditImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")

	failForField = "size"
	_, err = client.CreateEditImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")

	failForField = "response_format"
	_, err = client.CreateEditImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")

	failForField = ""
	mockBuilder.mockClose = func() error {
		return mockFailedErr
	}
	_, err = client.CreateEditImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")
}

func TestVariImageFormBuilderFailures(t *testing.T) {
	config := DefaultConfig("")
	config.BaseURL = ""
	client := NewClientWithConfig(config)

	mockBuilder := &mockFormBuilder{}
	client.createFormBuilder = func(io.Writer) utils.FormBuilder {
		return mockBuilder
	}
	ctx := context.Background()

	req := ImageVariRequest{}

	mockFailedErr := fmt.Errorf("mock form builder fail")
	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
		return mockFailedErr
	}
	_, err := client.CreateVariImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateVariImage should return error if form builder fails")

	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
		return nil
	}

	var failForField string
	mockBuilder.mockWriteField = func(fieldname, _ string) error {
		if fieldname == failForField {
			return mockFailedErr
		}
		return nil
	}

	failForField = "n"
	_, err = client.CreateVariImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateVariImage should return error if form builder fails")

	failForField = "size"
	_, err = client.CreateVariImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateVariImage should return error if form builder fails")

	failForField = "response_format"
	_, err = client.CreateVariImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateVariImage should return error if form builder fails")

	failForField = ""
	mockBuilder.mockClose = func() error {
		return mockFailedErr
	}
	_, err = client.CreateVariImage(ctx, req)
	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")
}