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# The MIT License (MIT)
# Copyright © 2026 qBitTensor Labs
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
# THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.

"""
Solution output protocol for Enigma challenges.
Miner containers communicate their results via stdout using this protocol:
  1. Text logs (human-readable, any format)
  2. A magic separator line (SOLUTION_OUTPUT_SEPARATOR)
  3. Base64-encoded zip containing result.json and other artifacts
Docker's json-file logging driver treats stdout as UTF-8 text and corrupts
raw binary, so the zip MUST be base64-encoded. The validator captures stdout
via ``docker logs`` after the container exits.
This module provides helpers for both sides:
  - Solver side: build_solution_zip(), write_solution_output()
  - Reader side: split_on_separator(), extract_artifacts()
"""

from __future__ import annotations

import base64
import binascii
import io
import os
import sys
import zipfile

# Magic separator line. Must match across solver, validator, and workbench.
SOLUTION_OUTPUT_SEPARATOR: bytes = (
    b"\n----- ENIGMA-SOLUTION-OUTPUT-BEGIN-a8c7f3e2-9d4b-4c5a-8f1e-2b6d3a4e5f7c -----\n"
)


# ---------------------------------------------------------------------------
# Solver-side helpers
# ---------------------------------------------------------------------------

def build_solution_zip(files: dict[str, str | bytes]) -> bytes:
    """Pack solution artifacts into an in-memory zip.
    Args:
        files: mapping of archive filename to content (str or bytes).
    Returns:
        Raw zip bytes.
    """
    buffer = io.BytesIO()
    with zipfile.ZipFile(buffer, "w", compression=zipfile.ZIP_DEFLATED) as zf:
        for name, content in files.items():
            zf.writestr(name, content)
    return buffer.getvalue()


def write_solution_output(zip_bytes: bytes) -> None:
    """Flush all output streams, then emit separator + base64-encoded zip to stdout.
    This MUST be the last thing written to stdout. Any subsequent output will
    corrupt the payload and cause extraction failures on the validator.
    """
    sys.stdout.flush()
    sys.stderr.flush()

    encoded = base64.b64encode(zip_bytes)
    buf = sys.stdout.buffer
    buf.write(SOLUTION_OUTPUT_SEPARATOR)
    buf.write(encoded)
    buf.write(b"\n")
    buf.flush()


# ---------------------------------------------------------------------------
# Reader-side helpers (validator / workbench)
# ---------------------------------------------------------------------------

def split_on_separator(raw_stdout: bytes) -> tuple[bytes, bytes, bool]:
    """Split raw stdout bytes at the solution output separator.
    Returns:
        (logs_bytes, payload_bytes, separator_found).
        The separator itself is consumed and appears in neither part.
    """
    idx = raw_stdout.find(SOLUTION_OUTPUT_SEPARATOR)
    if idx == -1:
        return raw_stdout, b"", False
    return raw_stdout[:idx], raw_stdout[idx + len(SOLUTION_OUTPUT_SEPARATOR):], True


def extract_artifacts(
    raw_stdout: bytes,
    output_dir: str,
) -> tuple[bool, str | None]:
    """Extract solution artifacts from raw container stdout.
    Splits on the separator, writes stdout.log from the log portion,
    base64-decodes the payload into a zip, and extracts the zip contents
    (result.json, solve_info.json, etc.) into output_dir.
    Args:
        raw_stdout: Raw bytes captured from the container's stdout.
        output_dir: Directory to write extracted files into.
    Returns:
        (success, error_message). error_message is None on success.
    """
    os.makedirs(output_dir, exist_ok=True)

    logs_bytes, payload_b64, found = split_on_separator(raw_stdout)

    # Always write the log portion
    log_path = os.path.join(output_dir, "stdout.log")
    with open(log_path, "wb") as f:
        f.write(logs_bytes)

    if not found:
        return False, (
            "No solution output separator found in container stdout. "
            "The solver must print logs, then the separator line, then "
            "a base64-encoded zip of result.json and other artifacts."
        )

    payload_b64 = payload_b64.strip()
    if not payload_b64:
        return False, "Separator found but base64 payload is empty."

    try:
        payload_bytes = base64.b64decode(payload_b64, validate=True)
    except (binascii.Error, ValueError) as e:
        return False, f"Base64 decode of solution payload failed: {e}"

    if not payload_bytes:
        return False, "Decoded payload is empty."

    zip_path = os.path.join(output_dir, "solution_artifacts.zip")
    with open(zip_path, "wb") as f:
        f.write(payload_bytes)

    if not zipfile.is_zipfile(zip_path):
        return False, "Decoded payload is not a valid zip file."

    try:
        with zipfile.ZipFile(zip_path, "r") as zf:
            dest = os.path.abspath(output_dir)
            for member in zf.infolist():
                member_path = os.path.normpath(os.path.join(dest, member.filename))
                if not (member_path == dest or member_path.startswith(dest + os.sep)):
                    return False, f"Zip member '{member.filename}' escapes output directory."
            zf.extractall(dest)
    except zipfile.BadZipFile as e:
        return False, f"Bad zip file: {e}"
    except Exception as e:
        return False, f"Zip extraction failed: {e}"

    return True, None

	# The MIT License (MIT)
	# Copyright © 2026 qBitTensor Labs
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
	# documentation files (the "Software"), to deal in the Software without restriction, including without limitation
	# the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
	# and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
	#
	# The above copyright notice and this permission notice shall be included in all copies or substantial portions of
	# the Software.
	#
	# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
	# THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	# DEALINGS IN THE SOFTWARE.

	"""
	Solution output protocol for Enigma challenges.

	Miner containers communicate their results via stdout using this protocol:

	1. Text logs (human-readable, any format)
	2. A magic separator line (SOLUTION_OUTPUT_SEPARATOR)
	3. Base64-encoded zip containing result.json and other artifacts

	Docker's json-file logging driver treats stdout as UTF-8 text and corrupts
	raw binary, so the zip MUST be base64-encoded. The validator captures stdout
	via ``docker logs`` after the container exits.

	This module provides helpers for both sides:
	- Solver side: build_solution_zip(), write_solution_output()
	- Reader side: split_on_separator(), extract_artifacts()
	"""

	from __future__ import annotations

	import base64
	import binascii
	import io
	import os
	import sys
	import zipfile

	# Magic separator line. Must match across solver, validator, and workbench.
	SOLUTION_OUTPUT_SEPARATOR: bytes = (
	b"\n----- ENIGMA-SOLUTION-OUTPUT-BEGIN-a8c7f3e2-9d4b-4c5a-8f1e-2b6d3a4e5f7c -----\n"
	)


	# ---------------------------------------------------------------------------
	# Solver-side helpers
	# ---------------------------------------------------------------------------

	def build_solution_zip(files: dict[str, str \| bytes]) -> bytes:
	"""Pack solution artifacts into an in-memory zip.

	Args:
	files: mapping of archive filename to content (str or bytes).

	Returns:
	Raw zip bytes.
	"""
	buffer = io.BytesIO()
	with zipfile.ZipFile(buffer, "w", compression=zipfile.ZIP_DEFLATED) as zf:
	for name, content in files.items():
	zf.writestr(name, content)
	return buffer.getvalue()


	def write_solution_output(zip_bytes: bytes) -> None:
	"""Flush all output streams, then emit separator + base64-encoded zip to stdout.

	This MUST be the last thing written to stdout. Any subsequent output will
	corrupt the payload and cause extraction failures on the validator.
	"""
	sys.stdout.flush()
	sys.stderr.flush()

	encoded = base64.b64encode(zip_bytes)
	buf = sys.stdout.buffer
	buf.write(SOLUTION_OUTPUT_SEPARATOR)
	buf.write(encoded)
	buf.write(b"\n")
	buf.flush()


	# ---------------------------------------------------------------------------
	# Reader-side helpers (validator / workbench)
	# ---------------------------------------------------------------------------

	def split_on_separator(raw_stdout: bytes) -> tuple[bytes, bytes, bool]:
	"""Split raw stdout bytes at the solution output separator.

	Returns:
	(logs_bytes, payload_bytes, separator_found).
	The separator itself is consumed and appears in neither part.
	"""
	idx = raw_stdout.find(SOLUTION_OUTPUT_SEPARATOR)
	if idx == -1:
	return raw_stdout, b"", False
	return raw_stdout[:idx], raw_stdout[idx + len(SOLUTION_OUTPUT_SEPARATOR):], True


	def extract_artifacts(
	raw_stdout: bytes,
	output_dir: str,
	) -> tuple[bool, str \| None]:
	"""Extract solution artifacts from raw container stdout.

	Splits on the separator, writes stdout.log from the log portion,
	base64-decodes the payload into a zip, and extracts the zip contents
	(result.json, solve_info.json, etc.) into output_dir.

	Args:
	raw_stdout: Raw bytes captured from the container's stdout.
	output_dir: Directory to write extracted files into.

	Returns:
	(success, error_message). error_message is None on success.
	"""
	os.makedirs(output_dir, exist_ok=True)

	logs_bytes, payload_b64, found = split_on_separator(raw_stdout)

	# Always write the log portion
	log_path = os.path.join(output_dir, "stdout.log")
	with open(log_path, "wb") as f:
	f.write(logs_bytes)

	if not found:
	return False, (
	"No solution output separator found in container stdout. "
	"The solver must print logs, then the separator line, then "
	"a base64-encoded zip of result.json and other artifacts."
	)

	payload_b64 = payload_b64.strip()
	if not payload_b64:
	return False, "Separator found but base64 payload is empty."

	try:
	payload_bytes = base64.b64decode(payload_b64, validate=True)
	except (binascii.Error, ValueError) as e:
	return False, f"Base64 decode of solution payload failed: {e}"

	if not payload_bytes:
	return False, "Decoded payload is empty."

	zip_path = os.path.join(output_dir, "solution_artifacts.zip")
	with open(zip_path, "wb") as f:
	f.write(payload_bytes)

	if not zipfile.is_zipfile(zip_path):
	return False, "Decoded payload is not a valid zip file."

	try:
	with zipfile.ZipFile(zip_path, "r") as zf:
	dest = os.path.abspath(output_dir)
	for member in zf.infolist():
	member_path = os.path.normpath(os.path.join(dest, member.filename))
	if not (member_path == dest or member_path.startswith(dest + os.sep)):
	return False, f"Zip member '{member.filename}' escapes output directory."
	zf.extractall(dest)
	except zipfile.BadZipFile as e:
	return False, f"Bad zip file: {e}"
	except Exception as e:
	return False, f"Zip extraction failed: {e}"

	return True, None