"""artifact-store publish adapter for optimizer evidence (WP-0004 Part 3)."""

from __future__ import annotations

import json
import os
import uuid
from dataclasses import dataclass
from pathlib import Path
from typing import Any, Dict, List, Optional
from urllib import error, parse, request

from ..metrics import OptimizerStore

ENV_API_URL = "ARTIFACTSTORE_API_URL"
ENV_API_TOKEN = "ARTIFACTSTORE_API_TOKEN"
DEFAULT_RETENTION_CLASS = "raw-evidence"
PRODUCER = "kaizen-agentic"


@dataclass
class PublishResult:
    package_id: str
    manifest_digest: Optional[str]
    files_uploaded: int
    retention_class: str


def build_optimizer_manifest(
    project_root: Path,
    *,
    agents: Optional[List[str]] = None,
) -> Dict[str, Any]:
    """Manifest metadata for an optimizer evidence package."""
    store = OptimizerStore(project_root)
    analysis = {}
    if store.analysis_path.exists():
        analysis = json.loads(store.analysis_path.read_text(encoding="utf-8"))

    return {
        "schema": "kaizen-agentic/optimizer-evidence/v1",
        "project": project_root.name,
        "project_root": str(project_root.resolve()),
        "producer": PRODUCER,
        "retention_class": DEFAULT_RETENTION_CLASS,
        "retention_days": 180,
        "optimized_at": analysis.get("optimized_at"),
        "agents": agents or [item.get("agent") for item in analysis.get("agents", [])],
        "files": [
            "optimizer/analysis.json",
            "optimizer/recommendations.jsonl",
        ],
    }


def publish_optimizer_evidence(
    project_root: Path,
    *,
    api_url: str,
    token: str,
    subject: Optional[str] = None,
    retention_class: str = DEFAULT_RETENTION_CLASS,
) -> PublishResult:
    """Register optimizer outputs as an artifact-store package."""
    store = OptimizerStore(project_root)
    if not store.analysis_path.exists():
        raise FileNotFoundError(
            f"No optimizer analysis at {store.analysis_path}. "
            "Run: kaizen-agentic metrics optimize"
        )

    manifest = build_optimizer_manifest(project_root)
    package_name = f"kaizen-optimizer-{project_root.name}"
    package_subject = subject or project_root.name

    created = _http_json(
        "POST",
        api_url,
        "/packages",
        token,
        {
            "name": package_name,
            "producer": PRODUCER,
            "subject": package_subject,
            "retention_class": retention_class,
            "metadata": manifest,
        },
    )
    package_id = created["id"]

    uploads = [
        (
            store.analysis_path,
            "optimizer/analysis.json",
            "application/json",
        ),
    ]
    if store.recommendations_path.exists():
        uploads.append(
            (
                store.recommendations_path,
                "optimizer/recommendations.jsonl",
                "application/x-ndjson",
            )
        )

    for path, relative_path, media_type in uploads:
        _http_multipart(
            api_url,
            f"/packages/{package_id}/files",
            token,
            fields={"relative_path": relative_path, "media_type": media_type},
            file_field="file",
            file_name=path.name,
            file_content_type=media_type,
            file_bytes=path.read_bytes(),
        )

    finalized = _http_json(
        "POST",
        api_url,
        f"/packages/{package_id}/finalize",
        token,
        {},
    )

    return PublishResult(
        package_id=package_id,
        manifest_digest=finalized.get("manifest_digest"),
        files_uploaded=len(uploads),
        retention_class=retention_class,
    )


def default_api_url() -> str:
    return os.environ.get(ENV_API_URL, "http://127.0.0.1:8000").rstrip("/")


def default_api_token() -> str:
    return os.environ.get(ENV_API_TOKEN, "")


def _http_json(
    method: str,
    base_url: str,
    path: str,
    token: str,
    payload: Dict[str, Any],
) -> Dict[str, Any]:
    body = json.dumps(payload).encode("utf-8") if payload else None
    headers = {"Accept": "application/json"}
    if body is not None:
        headers["Content-Type"] = "application/json"
    response = _http_bytes(method, base_url, path, token, body=body, headers=headers)
    decoded = json.loads(response)
    if not isinstance(decoded, dict):
        raise ValueError(f"expected JSON object from {path}")
    return decoded


def _http_multipart(
    base_url: str,
    path: str,
    token: str,
    *,
    fields: Dict[str, str],
    file_field: str,
    file_name: str,
    file_content_type: str,
    file_bytes: bytes,
) -> Dict[str, Any]:
    boundary = f"kaizen-{uuid.uuid4().hex}"
    body = bytearray()
    for name, value in fields.items():
        body.extend(f"--{boundary}\r\n".encode("ascii"))
        body.extend(
            f'Content-Disposition: form-data; name="{_quote(name)}"\r\n\r\n'.encode()
        )
        body.extend(value.encode())
        body.extend(b"\r\n")
    body.extend(f"--{boundary}\r\n".encode("ascii"))
    body.extend(
        (
            f'Content-Disposition: form-data; name="{_quote(file_field)}"; '
            f'filename="{_quote(file_name)}"\r\n'
            f"Content-Type: {file_content_type}\r\n\r\n"
        ).encode()
    )
    body.extend(file_bytes)
    body.extend(b"\r\n")
    body.extend(f"--{boundary}--\r\n".encode("ascii"))

    response = _http_bytes(
        "POST",
        base_url,
        path,
        token,
        body=bytes(body),
        headers={
            "Content-Type": f"multipart/form-data; boundary={boundary}",
            "Accept": "application/json",
        },
    )
    decoded = json.loads(response)
    if not isinstance(decoded, dict):
        raise ValueError(f"expected JSON object from {path}")
    return decoded


def _http_bytes(
    method: str,
    base_url: str,
    path: str,
    token: str,
    *,
    body: Optional[bytes] = None,
    headers: Optional[Dict[str, str]] = None,
) -> bytes:
    url = f"{base_url.rstrip('/')}/{path.lstrip('/')}"
    effective_headers = dict(headers or {})
    if token:
        effective_headers["Authorization"] = f"Bearer {token}"
    req = request.Request(url, data=body, headers=effective_headers, method=method)
    try:
        with request.urlopen(req, timeout=30) as resp:
            return resp.read()
    except error.HTTPError as exc:
        detail = exc.read().decode("utf-8", errors="replace")
        raise RuntimeError(f"HTTP {exc.code} from {path}: {detail}") from exc


def _quote(value: str) -> str:
    return parse.quote(value, safe="")