"""Sync endpoints — manifest, trigger, sync-settings, table-subscriptions."""

import hashlib
import logging
import os
import traceback
from datetime import datetime, timezone
from pathlib import Path
from typing import Optional, List

from fastapi import APIRouter, Depends, HTTPException, BackgroundTasks
from pydantic import BaseModel
import duckdb

from app.auth.dependencies import get_current_user, require_role, Role, _get_db
from src.repositories.sync_state import SyncStateRepository
from src.repositories.sync_settings import SyncSettingsRepository, DatasetPermissionRepository
from src.rbac import can_access_table

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/api/sync", tags=["sync"])


def _file_hash(path: Path) -> str:
    if not path.exists():
        return ""
    h = hashlib.md5()
    with open(path, "rb") as f:
        for chunk in iter(lambda: f.read(8192), b""):
            h.update(chunk)
    return h.hexdigest()


def _get_data_dir() -> Path:
    return Path(os.environ.get("DATA_DIR", "./data"))


def _run_sync(tables: Optional[List[str]] = None):
    """Run extractor as subprocess + orchestrator rebuild.

    Extractor runs in a separate process to avoid DuckDB lock conflicts
    with the main API process. Orchestrator rebuild runs in-process after
    the extractor finishes (it only reads extract.duckdb files).
    """
    import subprocess
    import sys

    try:
        # Run extractor as subprocess — completely separate DuckDB connections
        env = {**os.environ}
        cmd = [sys.executable, "-m", "connectors.keboola.extractor"]
        logger.info("Starting extractor subprocess: %s", " ".join(cmd))

        result = subprocess.run(
            cmd, capture_output=True, text=True, timeout=600, env=env,
            cwd=str(Path(__file__).parent.parent.parent),  # project root
        )

        if result.stdout:
            logger.info("Extractor stdout: %s", result.stdout[-500:])
        if result.stderr:
            logger.warning("Extractor stderr: %s", result.stderr[-500:])
        if result.returncode != 0:
            logger.error("Extractor failed (exit %d)", result.returncode)

        # Rebuild master views (reads extract.duckdb files, no write conflict)
        from src.orchestrator import SyncOrchestrator
        orch = SyncOrchestrator()
        views = orch.rebuild()
        logger.info("Orchestrator rebuild: %s", {k: len(v) for k, v in views.items()})

    except subprocess.TimeoutExpired:
        logger.error("Extractor timed out after 600s")
    except Exception as e:
        logger.error(f"Data sync failed: {e}\n{traceback.format_exc()}")


# ---- Manifest ----

@router.get("/manifest")
async def sync_manifest(
    user: dict = Depends(get_current_user),
    conn: duckdb.DuckDBPyConnection = Depends(_get_db),
):
    """Return hash-based manifest of all synced data, filtered per user."""
    repo = SyncStateRepository(conn)
    all_states = repo.get_all_states()

    # Filter by user's accessible tables (admin sees all)
    if user.get("role") != "admin":
        all_states = [s for s in all_states if can_access_table(user, s["table_id"], conn)]

    data_dir = _get_data_dir()
    tables = {}
    for state in all_states:
        table_id = state["table_id"]
        tables[table_id] = {
            "hash": state.get("hash", ""),
            "updated": state.get("last_sync").isoformat() if state.get("last_sync") else None,
            "size_bytes": state.get("file_size_bytes", 0),
            "rows": state.get("rows", 0),
        }

    # Asset hashes
    docs_dir = data_dir / "docs"
    assets = {}
    for asset_name, asset_path in [
        ("docs", docs_dir),
        ("profiles", data_dir / "src_data" / "metadata" / "profiles.json"),
    ]:
        if asset_path.exists():
            if asset_path.is_file():
                assets[asset_name] = {"hash": _file_hash(asset_path)}
            else:
                newest = max(
                    (f.stat().st_mtime for f in asset_path.rglob("*") if f.is_file()),
                    default=0,
                )
                assets[asset_name] = {"hash": str(int(newest))}

    return {
        "tables": tables,
        "assets": assets,
        "server_time": datetime.now(timezone.utc).isoformat(),
    }


# ---- Trigger ----

@router.post("/trigger")
async def trigger_sync(
    background_tasks: BackgroundTasks,
    tables: Optional[List[str]] = None,
    user: dict = Depends(require_role(Role.ADMIN)),
):
    """Trigger data sync from configured source. Admin only. Runs in background."""
    background_tasks.add_task(_run_sync, tables)
    return {
        "status": "triggered",
        "tables": tables or "all",
        "message": "Data sync started in background. Check /api/health for progress.",
    }


# ---- Sync Settings (dataset subscriptions) ----

class SyncSettingsUpdate(BaseModel):
    datasets: dict  # {dataset_name: bool}


@router.get("/settings")
async def get_sync_settings(
    user: dict = Depends(get_current_user),
    conn: duckdb.DuckDBPyConnection = Depends(_get_db),
):
    """Get user's dataset sync settings."""
    repo = SyncSettingsRepository(conn)
    settings = repo.get_user_settings(user["id"])
    enabled = repo.get_enabled_datasets(user["id"])
    return {
        "user_id": user["id"],
        "settings": settings,
        "enabled_datasets": enabled,
    }


@router.post("/settings")
async def update_sync_settings(
    request: SyncSettingsUpdate,
    user: dict = Depends(get_current_user),
    conn: duckdb.DuckDBPyConnection = Depends(_get_db),
):
    """Update user's dataset sync settings."""
    settings_repo = SyncSettingsRepository(conn)
    perm_repo = DatasetPermissionRepository(conn)

    results = {}
    for dataset, enabled in request.datasets.items():
        if not perm_repo.has_access(user["id"], dataset):
            results[dataset] = {"error": "no permission"}
            continue
        settings_repo.set_dataset_enabled(user["id"], dataset, enabled)
        results[dataset] = {"enabled": enabled}

    return {"updated": results}


# ---- Table Subscriptions ----

class TableSubscriptionUpdate(BaseModel):
    table_mode: str = "all"  # "all" or "explicit"
    tables: dict = {}  # {table_name: bool}


@router.get("/table-subscriptions")
async def get_table_subscriptions(
    user: dict = Depends(get_current_user),
    conn: duckdb.DuckDBPyConnection = Depends(_get_db),
):
    """Get user's per-table subscription settings."""
    repo = SyncSettingsRepository(conn)
    settings = repo.get_user_settings(user["id"])
    return {"user_id": user["id"], "subscriptions": settings}


@router.post("/table-subscriptions")
async def update_table_subscriptions(
    request: TableSubscriptionUpdate,
    user: dict = Depends(get_current_user),
    conn: duckdb.DuckDBPyConnection = Depends(_get_db),
):
    """Update per-table subscription preferences."""
    repo = SyncSettingsRepository(conn)
    for table_name, enabled in request.tables.items():
        repo.set_dataset_enabled(user["id"], table_name, enabled)
    return {"table_mode": request.table_mode, "updated": len(request.tables)}