"""
File Manager endpoints – Browse, upload, download /tank/share
Similar to cockpit-files but minimalist
"""

from fastapi import APIRouter, Depends, HTTPException, status, File, UploadFile, Query
from fastapi.responses import FileResponse, StreamingResponse
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from typing import Optional
import io
import os
import jwt
from datetime import datetime, timedelta

from services.file_manager import file_manager
from services.auth import auth_service

router = APIRouter(prefix="/api/navigator", tags=["navigator"])
security = HTTPBearer()


def get_current_user(credentials: HTTPAuthorizationCredentials = Depends(security)):
    """Verify JWT token and return username"""
    username = auth_service.verify_token(credentials.credentials)
    if not username:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token"
        )
    return username


class CreateFileRequest(BaseModel):
    path: str
    content: Optional[str] = ""


class RenameRequest(BaseModel):
    old_path: str
    new_name: str


class MkdirRequest(BaseModel):
    path: str


class ChangePermissionsRequest(BaseModel):
    path: str
    mode: str  # e.g. "755", "644"
    recursive: bool = False


class ChangeOwnerRequest(BaseModel):
    path: str
    owner: str
    group: Optional[str] = None


@router.get("/browse")
async def browse_directory(
    path: str = Query(""),
    admin: bool = Query(False),
    current_user: str = Depends(get_current_user)
):
    """
    List directory contents
    Query: ?path=/subdir&admin=false
    """
    from pathlib import Path as PyPath
    from services.file_manager import FileManager

    if admin:
        fm = FileManager(base_path=PyPath("/"))
    else:
        fm = file_manager

    result = fm.list_directory(path)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.get("/dirs")
async def list_subdirectories(
    path: str = Query(""),
    admin: bool = Query(False),
    current_user: str = Depends(get_current_user)
):
    """
    List only subdirectories of a path (for tree sidebar navigation).
    Query: ?path=/subdir&admin=false
    Returns: { dirs: [{name, path, has_children}] }
    """
    from pathlib import Path as PyPath
    from services.file_manager import FileManager

    if admin:
        fm = FileManager(base_path=PyPath("/"))
    else:
        fm = file_manager

    result = fm.list_subdirectories(path)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.get("/info")
async def get_info(
    path: str = Query(""),
    current_user: str = Depends(get_current_user)
):
    """
    Get file/directory info
    Query: ?path=/filename.txt
    """
    result = file_manager.get_file_info(path)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.get("/read")
async def read_file(
    path: str = Query(""),
    limit: Optional[int] = Query(None),
    current_user: str = Depends(get_current_user)
):
    """
    Read file content (text files only, max 10MB)
    Query: ?path=/file.txt&limit=1000
    """
    result = file_manager.read_file(path, limit)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.get("/download")
async def download_file(
    path: str = Query(""),
    current_user: str = Depends(get_current_user)
):
    """
    Download file
    Returns binary file stream
    """
    from pathlib import Path

    target = file_manager._resolve_path(path)
    if not target or not target.exists() or not target.is_file():
        raise HTTPException(status_code=404, detail="File not found")

    try:
        return FileResponse(
            path=target,
            filename=target.name,
            media_type="application/octet-stream"
        )
    except Exception as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.post("/upload")
async def upload_file(
    file: UploadFile = File(...),
    path: str = Query(""),
    current_user: str = Depends(get_current_user)
):
    """
    Upload file to directory
    Query: ?path=/subdir
    """
    from pathlib import Path

    target = file_manager._resolve_path(path)
    if not target or not target.is_dir():
        raise HTTPException(status_code=400, detail="Invalid upload directory")

    try:
        # Create target file path
        file_path = target / file.filename

        if file_path.exists():
            raise HTTPException(status_code=400, detail="File already exists")

        # Write uploaded file
        contents = await file.read()
        if len(contents) > file_manager.MAX_FILE_SIZE:
            raise HTTPException(status_code=413, detail="File too large")

        with open(file_path, "wb") as f:
            f.write(contents)

        return {
            "status": "success",
            "filename": file.filename,
            "size": len(contents),
            "path": str(file_path.relative_to(file_manager.base_path))
        }
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.post("/create")
async def create_file(
    request: CreateFileRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Create new file with optional content
    """
    result = file_manager.create_file(request.path, request.content)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.post("/mkdir")
async def make_directory(
    request: MkdirRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Create directory
    """
    result = file_manager.mkdir(request.path)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.post("/rename")
async def rename_file(
    request: RenameRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Rename file or directory
    """
    result = file_manager.rename_file(request.old_path, request.new_name)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.delete("/delete")
async def delete_file(
    path: str = Query(""),
    recursive: bool = Query(False),
    current_user: str = Depends(get_current_user)
):
    """
    Delete file or directory
    Query: ?path=/file.txt or ?path=/dir&recursive=true
    """
    result = file_manager.delete_file_or_dir(path, recursive)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.get("/space")
async def get_space_info(current_user: str = Depends(get_current_user)):
    """
    Get space usage of /tank/share
    """
    result = file_manager.get_space_info()
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.post("/permissions")
async def change_permissions(
    request: ChangePermissionsRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Change file/directory permissions (chmod)
    Request: {"path": "/file.txt", "mode": "755", "recursive": false}
    """
    if request.recursive:
        result = file_manager.change_permissions_recursive(request.path, request.mode)
    else:
        result = file_manager.change_permissions(request.path, request.mode)

    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.post("/owner")
async def change_owner(
    request: ChangeOwnerRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Change file/directory owner (chown)
    Request: {"path": "/file.txt", "owner": "root", "group": "wheel"}
    """
    result = file_manager.change_owner(request.path, request.owner, request.group)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


class UnlockRequest(BaseModel):
    password: str


@router.post("/unlock")
async def unlock_admin_mode(
    request: UnlockRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Unlock admin mode with password
    Returns a token that enables full filesystem access
    """
    admin_password = os.environ.get("ZFS_ADMIN_PASSWORD", "admin")

    if request.password != admin_password:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid admin password"
        )

    # Generate a short-lived admin token (valid for 1 hour)
    secret_key = os.environ.get("ZFS_SECRET_KEY", "change-me-in-production")
    payload = {
        "sub": current_user,
        "admin": True,
        "exp": datetime.utcnow() + timedelta(hours=1)
    }
    token = jwt.encode(payload, secret_key, algorithm="HS256")

    return {
        "status": "success",
        "admin_token": token,
        "message": "Admin mode unlocked"
    }


class CopyRequest(BaseModel):
    src: str
    dst: str
    overwrite: bool = False


@router.post("/copy")
async def copy_file(
    request: CopyRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Copy file or directory
    """
    result = file_manager.copy_file(request.src, request.dst, request.overwrite)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


class MoveRequest(BaseModel):
    src: str
    dst: str
    overwrite: bool = False


@router.post("/move")
async def move_file(
    request: MoveRequest,
    current_user: str = Depends(get_current_user)
):
    """
    Move (rename) file or directory
    """
    result = file_manager.move_file(request.src, request.dst, request.overwrite)
    if "error" in result:
        raise HTTPException(status_code=400, detail=result["error"])
    return result


@router.get("/search")
async def search_files(
    q: str = Query(""),
    path: str = Query(""),
    limit: int = Query(50),
    current_user: str = Depends(get_current_user)
):
    """
    Search for files by name (case-insensitive)
    Query: ?q=term&path=/subdir&limit=50
    """
    if not q:
        raise HTTPException(status_code=400, detail="Query parameter 'q' is required")

    results = file_manager.search_files(q, path, limit)
    return {
        "query": q,
        "path": path or "/",
        "results": results,
        "count": len(results)
    }