"""YakPanel - File manager API"""
import os
import shutil
import stat
import zipfile
from datetime import datetime, timezone

from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, Form
from fastapi.responses import FileResponse
from pydantic import BaseModel, Field

from app.core.config import get_runtime_config
from app.core.utils import read_file, write_file, path_safe_check
from app.api.auth import get_current_user
from app.models.user import User

router = APIRouter(prefix="/files", tags=["files"])


def _resolve_path(path: str) -> str:
    """
    Resolve API path to an OS path.

    On Linux/macOS: path is an absolute POSIX path from filesystem root (/) so admins
    can browse the whole server (typical expectation for a full-server admin file manager).

    On Windows (dev): paths stay sandboxed under www_root / setup_path.
    """
    if ".." in path:
        raise HTTPException(status_code=400, detail="Path traversal not allowed")

    raw = path.strip().replace("\\", "/")

    if os.name == "nt":
        cfg = get_runtime_config()
        www_root = os.path.abspath(cfg["www_root"])
        setup_path = os.path.abspath(cfg["setup_path"])
        allowed = [www_root, setup_path]
        norm_path = raw.strip("/")
        if not norm_path or norm_path in ("www", "www/wwwroot", "wwwroot"):
            full = www_root
        elif norm_path.startswith("www/wwwroot/"):
            full = os.path.abspath(os.path.join(www_root, norm_path[12:]))
        else:
            full = os.path.abspath(os.path.join(www_root, norm_path))
        if not any(
            full == r or (full + os.sep).startswith(r + os.sep)
            for r in allowed
        ):
            raise HTTPException(status_code=403, detail="Path not allowed")
        return full

    # POSIX: absolute paths from /
    if not raw or raw == "/":
        return "/"
    if not raw.startswith("/"):
        raw = "/" + raw
    full = os.path.normpath(raw)
    if not full.startswith("/"):
        raise HTTPException(status_code=400, detail="Invalid path")
    return full


def _stat_entry(path: str, name: str) -> dict | None:
    item_path = os.path.join(path, name)
    try:
        st = os.stat(item_path, follow_symlinks=False)
    except OSError:
        return None
    is_dir = os.path.isdir(item_path)
    owner = str(st.st_uid)
    group = str(st.st_gid)
    try:
        import pwd
        import grp

        owner = pwd.getpwuid(st.st_uid).pw_name
        group = grp.getgrgid(st.st_gid).gr_name
    except (ImportError, KeyError, OSError):
        pass
    try:
        sym = stat.filemode(st.st_mode)
    except Exception:
        sym = ""
    return {
        "name": name,
        "is_dir": is_dir,
        "size": st.st_size if not is_dir else 0,
        "mtime": datetime.fromtimestamp(st.st_mtime, tz=timezone.utc).strftime("%Y-%m-%d %H:%M:%S"),
        "mtime_ts": int(st.st_mtime),
        "mode": format(st.st_mode & 0o777, "o"),
        "mode_symbolic": sym,
        "owner": owner,
        "group": group,
    }


@router.get("/list")
async def files_list(
    path: str = "/",
    current_user: User = Depends(get_current_user),
):
    """List directory contents"""
    try:
        full = _resolve_path(path)
    except HTTPException:
        raise
    if not os.path.isdir(full):
        raise HTTPException(status_code=404, detail="Not a directory")
    items = []
    try:
        names = os.listdir(full)
    except PermissionError:
        raise HTTPException(status_code=403, detail="Permission denied")
    except FileNotFoundError:
        raise HTTPException(status_code=404, detail="Not found")
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    for name in sorted(names, key=str.lower):
        row = _stat_entry(full, name)
        if row:
            items.append(row)
    display_path = full if full == "/" else full.rstrip("/")
    return {"path": display_path, "items": items}


@router.get("/dir-size")
async def files_dir_size(
    path: str,
    current_user: User = Depends(get_current_user),
):
    """Return total byte size of directory tree (may be slow on large trees)."""
    try:
        full = _resolve_path(path)
    except HTTPException:
        raise
    if not os.path.isdir(full):
        raise HTTPException(status_code=400, detail="Not a directory")
    total = 0
    try:
        for root, _dirs, files in os.walk(full):
            for fn in files:
                fp = os.path.join(root, fn)
                try:
                    total += os.path.getsize(fp)
                except OSError:
                    pass
    except PermissionError:
        raise HTTPException(status_code=403, detail="Permission denied")
    return {"size": total}


@router.get("/search")
async def files_search(
    q: str,
    path: str = "/",
    max_results: int = 200,
    current_user: User = Depends(get_current_user),
):
    """Find files/folders whose name contains q (case-insensitive), walking from path."""
    if not q or not q.strip():
        return {"path": path, "results": []}
    try:
        root = _resolve_path(path)
    except HTTPException:
        raise
    if not os.path.isdir(root):
        raise HTTPException(status_code=400, detail="Not a directory")
    qn = q.strip().lower()
    results: list[dict] = []
    skip_prefixes = tuple()
    if os.name != "nt" and root in ("/", "//"):
        skip_prefixes = ("/proc", "/sys", "/dev")

    def should_skip(p: str) -> bool:
        ap = os.path.abspath(p)
        return any(ap == sp or ap.startswith(sp + os.sep) for sp in skip_prefixes)

    try:
        for dirpath, dirnames, filenames in os.walk(root, topdown=True):
            if len(results) >= max_results:
                break
            if should_skip(dirpath):
                dirnames[:] = []
                continue
            try:
                for dn in list(dirnames):
                    if len(results) >= max_results:
                        break
                    if qn in dn.lower():
                        rel = os.path.join(dirpath, dn)
                        results.append({"path": rel.replace("\\", "/"), "name": dn, "is_dir": True})
                for fn in filenames:
                    if len(results) >= max_results:
                        break
                    if qn in fn.lower():
                        rel = os.path.join(dirpath, fn)
                        results.append({"path": rel.replace("\\", "/"), "name": fn, "is_dir": False})
            except OSError:
                continue
    except PermissionError:
        raise HTTPException(status_code=403, detail="Permission denied")

    return {"path": path, "query": q, "results": results[:max_results]}


@router.get("/read")
async def files_read(
    path: str,
    current_user: User = Depends(get_current_user),
):
    """Read file content"""
    try:
        full = _resolve_path(path)
    except HTTPException:
        raise
    if not os.path.isfile(full):
        raise HTTPException(status_code=404, detail="Not a file")
    content = read_file(full)
    if content is None:
        raise HTTPException(status_code=500, detail="Failed to read file")
    return {"path": path, "content": content}


@router.get("/download")
async def files_download(
    path: str,
    current_user: User = Depends(get_current_user),
):
    """Download file"""
    try:
        full = _resolve_path(path)
    except HTTPException:
        raise
    if not os.path.isfile(full):
        raise HTTPException(status_code=404, detail="Not a file")
    return FileResponse(full, filename=os.path.basename(full))


@router.post("/upload")
async def files_upload(
    path: str = Form(...),
    file: UploadFile = File(...),
    current_user: User = Depends(get_current_user),
):
    """Upload file to directory"""
    try:
        full = _resolve_path(path)
    except HTTPException:
        raise
    if not os.path.isdir(full):
        raise HTTPException(status_code=400, detail="Path must be a directory")
    filename = file.filename or "upload"
    if ".." in filename or "/" in filename or "\\" in filename:
        raise HTTPException(status_code=400, detail="Invalid filename")
    dest = os.path.join(full, filename)
    content = await file.read()
    if not write_file(dest, content, "wb"):
        raise HTTPException(status_code=500, detail="Failed to write file")
    return {"status": True, "msg": "Uploaded", "path": path + "/" + filename}


class MkdirRequest(BaseModel):
    path: str
    name: str


class RenameRequest(BaseModel):
    path: str
    old_name: str
    new_name: str


class DeleteRequest(BaseModel):
    path: str
    name: str
    is_dir: bool


@router.post("/mkdir")
async def files_mkdir(
    body: MkdirRequest,
    current_user: User = Depends(get_current_user),
):
    """Create directory"""
    try:
        parent = _resolve_path(body.path)
    except HTTPException:
        raise
    if not os.path.isdir(parent):
        raise HTTPException(status_code=400, detail="Parent must be a directory")
    if not body.name or ".." in body.name or "/" in body.name or "\\" in body.name:
        raise HTTPException(status_code=400, detail="Invalid directory name")
    if not path_safe_check(body.name):
        raise HTTPException(status_code=400, detail="Invalid directory name")
    full = os.path.join(parent, body.name)
    if os.path.exists(full):
        raise HTTPException(status_code=400, detail="Already exists")
    try:
        os.makedirs(full, 0o755)
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Created", "path": body.path.rstrip("/") + "/" + body.name}


@router.post("/rename")
async def files_rename(
    body: RenameRequest,
    current_user: User = Depends(get_current_user),
):
    """Rename file or directory"""
    try:
        parent = _resolve_path(body.path)
    except HTTPException:
        raise
    if not body.old_name or not body.new_name:
        raise HTTPException(status_code=400, detail="Names required")
    for n in (body.old_name, body.new_name):
        if ".." in n or "/" in n or "\\" in n or not path_safe_check(n):
            raise HTTPException(status_code=400, detail="Invalid name")
    old_full = os.path.join(parent, body.old_name)
    new_full = os.path.join(parent, body.new_name)
    if not os.path.exists(old_full):
        raise HTTPException(status_code=404, detail="Not found")
    if os.path.exists(new_full):
        raise HTTPException(status_code=400, detail="Target already exists")
    try:
        os.rename(old_full, new_full)
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Renamed"}


@router.post("/delete")
async def files_delete(
    body: DeleteRequest,
    current_user: User = Depends(get_current_user),
):
    """Delete file or directory"""
    try:
        parent = _resolve_path(body.path)
    except HTTPException:
        raise
    if not body.name or ".." in body.name or "/" in body.name or "\\" in body.name:
        raise HTTPException(status_code=400, detail="Invalid name")
    full = os.path.join(parent, body.name)
    if not os.path.exists(full):
        raise HTTPException(status_code=404, detail="Not found")
    try:
        if body.is_dir:
            import shutil
            shutil.rmtree(full)
        else:
            os.remove(full)
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Deleted"}


class WriteFileRequest(BaseModel):
    path: str
    content: str


@router.post("/write")
async def files_write(
    body: WriteFileRequest,
    current_user: User = Depends(get_current_user),
):
    """Write text file content"""
    try:
        full = _resolve_path(body.path)
    except HTTPException:
        raise
    if os.path.isdir(full):
        raise HTTPException(status_code=400, detail="Cannot write to directory")
    if not write_file(full, body.content):
        raise HTTPException(status_code=500, detail="Failed to write file")
    return {"status": True, "msg": "Saved"}


class TouchRequest(BaseModel):
    path: str
    name: str


class ChmodRequest(BaseModel):
    file_path: str
    mode: str = Field(description="Octal mode e.g. 0644 or 755")
    recursive: bool = False


class CopyRequest(BaseModel):
    path: str
    name: str
    dest_path: str
    dest_name: str | None = None


class MoveRequest(BaseModel):
    path: str
    name: str
    dest_path: str
    dest_name: str | None = None


class CompressRequest(BaseModel):
    path: str
    names: list[str]
    archive_name: str


@router.post("/touch")
async def files_touch(
    body: TouchRequest,
    current_user: User = Depends(get_current_user),
):
    """Create an empty file in directory path."""
    try:
        parent = _resolve_path(body.path)
    except HTTPException:
        raise
    if not body.name or ".." in body.name or "/" in body.name or "\\" in body.name:
        raise HTTPException(status_code=400, detail="Invalid name")
    if not path_safe_check(body.name):
        raise HTTPException(status_code=400, detail="Invalid name")
    full = os.path.join(parent, body.name)
    if os.path.exists(full):
        raise HTTPException(status_code=400, detail="Already exists")
    try:
        open(full, "a", encoding="utf-8").close()
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Created"}


@router.post("/chmod")
async def files_chmod(
    body: ChmodRequest,
    current_user: User = Depends(get_current_user),
):
    """chmod a file or directory. mode is octal string (644, 0755)."""
    try:
        full = _resolve_path(body.file_path)
    except HTTPException:
        raise
    if not os.path.exists(full):
        raise HTTPException(status_code=404, detail="Not found")
    try:
        mode = int(body.mode.strip(), 8)
    except ValueError:
        raise HTTPException(status_code=400, detail="Invalid mode")
    if mode < 0 or mode > 0o7777:
        raise HTTPException(status_code=400, detail="Invalid mode")

    def _chmod_one(p: str) -> None:
        os.chmod(p, mode)

    try:
        if body.recursive and os.path.isdir(full):
            for root, dirs, files in os.walk(full):
                for d in dirs:
                    _chmod_one(os.path.join(root, d))
                for f in files:
                    _chmod_one(os.path.join(root, f))
            _chmod_one(full)
        else:
            _chmod_one(full)
    except PermissionError:
        raise HTTPException(status_code=403, detail="Permission denied")
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Permissions updated"}


@router.post("/copy")
async def files_copy(
    body: CopyRequest,
    current_user: User = Depends(get_current_user),
):
    """Copy file or directory into dest_path (optionally new name)."""
    try:
        src_parent = _resolve_path(body.path)
        dest_parent = _resolve_path(body.dest_path)
    except HTTPException:
        raise
    if not body.name or ".." in body.name:
        raise HTTPException(status_code=400, detail="Invalid name")
    src = os.path.join(src_parent, body.name)
    dest_name = body.dest_name or body.name
    if ".." in dest_name or "/" in dest_name or "\\" in dest_name:
        raise HTTPException(status_code=400, detail="Invalid destination name")
    dest = os.path.join(dest_parent, dest_name)
    if not os.path.exists(src):
        raise HTTPException(status_code=404, detail="Source not found")
    if os.path.exists(dest):
        raise HTTPException(status_code=400, detail="Destination already exists")
    if not os.path.isdir(dest_parent):
        raise HTTPException(status_code=400, detail="Destination parent must be a directory")
    try:
        if os.path.isdir(src):
            shutil.copytree(src, dest, symlinks=True)
        else:
            shutil.copy2(src, dest)
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Copied"}


@router.post("/move")
async def files_move(
    body: MoveRequest,
    current_user: User = Depends(get_current_user),
):
    """Move (rename) file or directory to another folder."""
    try:
        src_parent = _resolve_path(body.path)
        dest_parent = _resolve_path(body.dest_path)
    except HTTPException:
        raise
    if not body.name or ".." in body.name:
        raise HTTPException(status_code=400, detail="Invalid name")
    src = os.path.join(src_parent, body.name)
    dest_name = body.dest_name or body.name
    if ".." in dest_name or "/" in dest_name or "\\" in dest_name:
        raise HTTPException(status_code=400, detail="Invalid destination name")
    dest = os.path.join(dest_parent, dest_name)
    if not os.path.exists(src):
        raise HTTPException(status_code=404, detail="Source not found")
    if os.path.exists(dest):
        raise HTTPException(status_code=400, detail="Destination already exists")
    if not os.path.isdir(dest_parent):
        raise HTTPException(status_code=400, detail="Destination parent must be a directory")
    try:
        shutil.move(src, dest)
    except OSError as e:
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Moved"}


@router.post("/compress")
async def files_compress(
    body: CompressRequest,
    current_user: User = Depends(get_current_user),
):
    """Create a zip in path containing named files/folders."""
    try:
        parent = _resolve_path(body.path)
    except HTTPException:
        raise
    if not os.path.isdir(parent):
        raise HTTPException(status_code=400, detail="Not a directory")
    if not body.names:
        raise HTTPException(status_code=400, detail="Nothing to compress")
    name = (body.archive_name or "archive").strip()
    if not name.lower().endswith(".zip"):
        name += ".zip"
    if ".." in name or "/" in name or "\\" in name:
        raise HTTPException(status_code=400, detail="Invalid archive name")
    zip_path = os.path.join(parent, name)
    if os.path.exists(zip_path):
        raise HTTPException(status_code=400, detail="Archive already exists")

    try:
        with zipfile.ZipFile(zip_path, "w", zipfile.ZIP_DEFLATED) as zf:
            for entry in body.names:
                if not entry or ".." in entry or "/" in entry or "\\" in entry:
                    continue
                src = os.path.join(parent, entry)
                if not os.path.exists(src):
                    continue
                if os.path.isfile(src):
                    zf.write(src, arcname=entry.replace("\\", "/"))
                elif os.path.isdir(src):
                    for root, _dirs, files in os.walk(src):
                        for f in files:
                            fp = os.path.join(root, f)
                            zn = os.path.relpath(fp, parent).replace("\\", "/")
                            zf.write(fp, zn)
    except OSError as e:
        if os.path.exists(zip_path):
            try:
                os.remove(zip_path)
            except OSError:
                pass
        raise HTTPException(status_code=500, detail=str(e))
    return {"status": True, "msg": "Compressed", "archive": name}