package osimage

import (
	"context"
	"fmt"
)

func ApplyImageStreamed(ctx context.Context, opts ApplyOptions) (*ApplyResult, error) {
	if err := ValidateApplyOptions(opts); err != nil {
		return nil, err
	}

	if err := CheckTargetSafe(opts.TargetPath, opts.ExpectedRawSize); err != nil {
		return nil, fmt.Errorf("unsafe target %q: %w", opts.TargetPath, err)
	}

	src, closeFn, err := OpenDecompressedHTTPStream(ctx, opts.URL, opts.HTTPTimeout)
	if err != nil {
		return nil, fmt.Errorf("open source stream: %w", err)
	}
	defer closeFn()

	written, err := WriteStreamToTarget(ctx, src, opts.TargetPath, opts.ExpectedRawSize, opts.BufferSize, opts.Progress)
	if err != nil {
		return nil, fmt.Errorf("write target: %w", err)
	}

	sum, err := VerifyTargetSHA256(ctx, opts.TargetPath, opts.ExpectedRawSize, opts.BufferSize, opts.Progress)
	if err != nil {
		return nil, fmt.Errorf("verify target: %w", err)
	}

	if err := VerifySHA256(sum, opts.ExpectedRawSHA256); err != nil {
		return nil, fmt.Errorf("final disk checksum mismatch: %w", err)
	}

	return &ApplyResult{
		BytesWritten:   written,
		VerifiedSHA256: sum,
		VerificationOK: true,
	}, nil
}