"""File & directory mutation endpoints (ROADMAP #85, tranche 6b).

Handlers déplacés depuis :mod:`backend.main` sans changement de
comportement : mêmes chemins (``PUT/DELETE/PATCH/POST /api/file/*``,
``/api/directory/*``, ``/api/move/*``, ``/api/vault/*/batch-upload``),
mêmes modèles de requête/réponse (déménagés dans :mod:`backend.schemas`),
mêmes dépendances d'authentification et mêmes effets de bord (audit, index
incrémental, SSE, webhooks, plugins, historique).

La logique métier vit déjà dans :mod:`backend.services.mutations`.
"""

import logging
from typing import Any

from fastapi import APIRouter, Body, Depends, HTTPException, Query

from backend.audit import log_file_delete, log_file_save
from backend.auth.middleware import check_vault_access, require_auth
from backend.history import (
    remove_recent,
    update_bookmarks_after_rename,
    update_history_after_rename,
)
from backend.indexer import handle_file_move, remove_single_file, update_single_file
from backend.schemas import (
    BatchUploadRequest,
    BatchUploadResponse,
    DirectoryCreateRequest,
    DirectoryCreateResponse,
    DirectoryDeleteResponse,
    DirectoryRenameRequest,
    DirectoryRenameResponse,
    FileCreateRequest,
    FileCreateResponse,
    FileDeleteResponse,
    FileMoveRequest,
    FileMoveResponse,
    FileRenameRequest,
    FileRenameResponse,
    FileSaveResponse,
)
from backend.services.mutations import (
    batch_upload_files as service_batch_upload_files,
)
from backend.services.mutations import (
    create_directory as service_create_directory,
)
from backend.services.mutations import (
    create_file as service_create_file,
)
from backend.services.mutations import (
    delete_directory as service_delete_directory,
)
from backend.services.mutations import (
    delete_file as service_delete_file,
)
from backend.services.mutations import (
    edit_file as service_edit_file,
)
from backend.services.mutations import (
    edit_xlsx_cells as service_edit_xlsx_cells,
)
from backend.services.mutations import (
    move_path as service_move_path,
)
from backend.services.mutations import (
    rename_directory as service_rename_directory,
)
from backend.services.mutations import (
    rename_file as service_rename_file,
)
from backend.share import update_shares_after_rename
from backend.sse import sse_manager
from backend.webhooks import dispatch_webhooks

logger = logging.getLogger("obsigate")

router = APIRouter(tags=["files"])


@router.put("/api/file/{vault_name}/save", response_model=FileSaveResponse)
async def api_file_save(
    vault_name: str,
    path: str = Query(..., description="Relative path to file"),
    body: dict = Body(...),
    backup: bool = Query(True, description="Create a backup before saving (default true, set false for auto-save)"),
    current_user=Depends(require_auth),
):
    """Save (overwrite) a file's content.

    Expects a JSON body with a ``content`` key containing the new text.
    The path is validated against traversal attacks before writing.

    Args:
        vault_name: Name of the vault.
        path: Relative file path within the vault.
        body: JSON body with ``content`` string.

    Returns:
        ``FileSaveResponse`` confirming the write.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    content = body.get("content", "")
    result = service_edit_file(vault_name, path, content, backup=backup)

    # Audit log
    client_ip = current_user.get("_request_ip", "unknown")
    log_file_save(current_user["username"], vault_name, path, len(content), client_ip)

    return {"status": "ok", "vault": result["vault"], "path": result["path"], "size": result["size"]}


@router.put("/api/file/{vault_name}/xlsx/save", response_model=FileSaveResponse)
def api_file_xlsx_save(
    vault_name: str,
    path: str = Query(..., description="Relative path to the .xlsx file"),
    body: dict = Body(
        ...,
        description=(
            '{"sheet": str, "cells": {"A1": value}, '
            '"allow_formula": false, "force": false}'
        ),
    ),
    current_user=Depends(require_auth),
):
    """Apply cell edits to an .xlsx workbook.

    Expects a JSON body with ``sheet`` and ``cells`` (A1 references to new
    scalar values, max 500 per request) plus two optional boolean flags:

    * ``allow_formula`` — keep values starting with ``=``/``@`` as real
      formulas. Off by default (#153 A4): such a value is stored as text so a
      later Excel session cannot execute it (DDE).
    * ``force`` — write a workbook carrying features openpyxl cannot re-serialize
      (slicers, form controls, connections, custom XML, signature, cached formula
      results). Without it the call fails **409** ``xlsx_lossy_content`` and the
      client asks the user to confirm (#153 A1).

    A backup is created before the workbook is rewritten, and the new archive
    swaps in atomically. Declared as a sync endpoint on purpose: the openpyxl
    round-trip and the per-file lock wait (#153 A3) then run in the threadpool
    instead of blocking the event loop.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    sheet = body.get("sheet")
    cells = body.get("cells")
    if not isinstance(sheet, str) or not sheet:
        raise HTTPException(status_code=400, detail="Feuille manquante")
    if not isinstance(cells, dict) or not cells or len(cells) > 500:
        raise HTTPException(status_code=400, detail="Cellules invalides (1 à 500 par requête)")
    for ref, value in cells.items():
        if not isinstance(ref, str) or not isinstance(value, (str, int, float, bool, type(None))):
            raise HTTPException(status_code=400, detail=f"Cellule invalide: {ref!r}")
    flags: dict[str, bool] = {}
    for name in ("allow_formula", "force"):
        raw = body.get(name, False)
        if not isinstance(raw, bool):
            raise HTTPException(status_code=400, detail=f"Flag invalide: {name}")
        flags[name] = raw

    result = service_edit_xlsx_cells(
        vault_name, path, sheet, cells, **flags
    )
    log_file_save(
        current_user["username"], vault_name, path,
        sum(len(str(v)) for v in cells.values()),
        current_user.get("_request_ip", "unknown"),
    )
    return {"status": "ok", "vault": result["vault"], "path": result["path"], "size": result["size"]}


@router.delete("/api/file/{vault_name}", response_model=FileDeleteResponse)
async def api_file_delete(vault_name: str, path: str = Query(..., description="Relative path to file"), current_user=Depends(require_auth)):
    """Delete a file from the vault.

    The path is validated against traversal attacks before deletion.

    Args:
        vault_name: Name of the vault.
        path: Relative file path within the vault.

    Returns:
        ``FileDeleteResponse`` confirming the deletion.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    result = service_delete_file(vault_name, path)

    # Audit log
    client_ip = current_user.get("_request_ip", "unknown")
    log_file_delete(current_user["username"], vault_name, path, client_ip)

    # Update index
    await remove_single_file(vault_name, path)

    # Broadcast SSE event
    await sse_manager.broadcast("file_deleted", {
        "vault": vault_name,
        "path": path,
    })

    from backend.plugins import emit_file_deleted
    emit_file_deleted(vault_name, path)

    # Remove from recent files
    remove_recent(current_user["username"], vault_name, path)

    # Dispatch webhooks
    await dispatch_webhooks("file_deleted", {"vault": vault_name, "path": path})

    return {"status": "ok", "vault": result["vault"], "path": result["path"]}


@router.post("/api/directory/{vault_name}", response_model=DirectoryCreateResponse)
async def api_directory_create(
    vault_name: str,
    body: DirectoryCreateRequest,
    current_user=Depends(require_auth),
):
    """Create a new directory in a vault.

    Args:
        vault_name: Name of the vault.
        body: Request body with directory path.

    Returns:
        DirectoryCreateResponse confirming creation.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    result = service_create_directory(vault_name, body.path)

    # Update path_index with the new directory
    from backend.indexer import _index_lock
    from backend.indexer import path_index as _path_idx
    with _index_lock:
        if vault_name not in _path_idx:
            _path_idx[vault_name] = []
        existing = {p["path"] for p in _path_idx[vault_name]}
        # Build all parent segments
        parts = body.path.split("/")
        for i in range(1, len(parts) + 1):
            seg_path = "/".join(parts[:i])
            if seg_path and seg_path not in existing:
                existing.add(seg_path)
                _path_idx[vault_name].append({
                    "path": seg_path,
                    "name": parts[i - 1],
                    "type": "directory",
                })

    # Broadcast SSE event
    await sse_manager.broadcast("directory_created", {
        "vault": vault_name,
        "path": result["path"],
    })
    await dispatch_webhooks("directory_created", {"vault": vault_name, "path": result["path"]})

    return {"success": True, "path": result["path"]}


@router.patch("/api/directory/{vault_name}", response_model=DirectoryRenameResponse)
async def api_directory_rename(
    vault_name: str,
    body: DirectoryRenameRequest,
    current_user=Depends(require_auth),
):
    """Rename a directory in a vault.

    Args:
        vault_name: Name of the vault.
        body: Request body with current path and new name.

    Returns:
        DirectoryRenameResponse with old and new paths.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    result = service_rename_directory(vault_name, body.path, body.new_name)
    old_path_str = result["old_path"]
    new_path_str = result["new_path"]

    # Update index for all files in the directory
    from backend.indexer import reload_single_vault
    await reload_single_vault(vault_name)

    # Broadcast SSE event
    await sse_manager.broadcast("directory_renamed", {
        "vault": vault_name,
        "old_path": old_path_str,
        "new_path": new_path_str,
    })
    await dispatch_webhooks("directory_renamed", {"vault": vault_name, "old_path": old_path_str, "new_path": new_path_str})

    return {"success": True, "old_path": old_path_str, "new_path": new_path_str}


@router.delete("/api/directory/{vault_name}", response_model=DirectoryDeleteResponse)
async def api_directory_delete(
    vault_name: str,
    path: str = Query(..., description="Relative path to directory"),
    current_user=Depends(require_auth),
):
    """Delete a directory and all its contents from a vault.

    Args:
        vault_name: Name of the vault.
        path: Relative directory path within the vault.

    Returns:
        DirectoryDeleteResponse with count of deleted files.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    result = service_delete_directory(vault_name, path, recursive=True)
    file_count = result["deleted_count"]

    # Update index
    from backend.indexer import reload_single_vault
    await reload_single_vault(vault_name)

    # Broadcast SSE event
    await sse_manager.broadcast("directory_deleted", {
        "vault": vault_name,
        "path": result["path"],
        "deleted_count": file_count,
    })
    await dispatch_webhooks("directory_deleted", {"vault": vault_name, "path": result["path"]})

    return {"success": True, "deleted_count": file_count}


@router.post("/api/file/{vault_name}", response_model=FileCreateResponse)
async def api_file_create(
    vault_name: str,
    body: FileCreateRequest,
    current_user=Depends(require_auth),
):
    """Create a new file in a vault.

    Args:
        vault_name: Name of the vault.
        body: Request body with file path and initial content.

    Returns:
        FileCreateResponse confirming creation.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    result = service_create_file(vault_name, body.path, body.content)

    # Update index
    await update_single_file(vault_name, result["path"])

    # Broadcast SSE event
    await sse_manager.broadcast("file_created", {
        "vault": vault_name,
        "path": result["path"],
    })
    await dispatch_webhooks("file_created", {"vault": vault_name, "path": result["path"]})
    from backend.plugins import emit_file_created
    emit_file_created(vault_name, result["path"])

    return {"success": True, "path": result["path"]}


@router.post("/api/vault/{vault_name}/batch-upload", response_model=BatchUploadResponse)
async def api_batch_upload(
    vault_name: str,
    body: BatchUploadRequest,
    current_user=Depends(require_auth),
):
    """Upload multiple files and directories (recursively) into a vault.

    Accepts base64 encoded or plain text files with relative directory paths.
    Creates missing parent folders safely.

    Args:
        vault_name: Target vault name.
        body: BatchUploadRequest with target_dir and files list.

    Returns:
        BatchUploadResponse with summary of uploaded files and errors.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    import base64

    items: list[dict[str, Any]] = []
    for f in body.files:
        if f.is_dir:
            items.append({"path": f.path, "is_dir": True})
            continue

        raw_bytes = b""
        if f.content is not None:
            # Check if content is base64 encoded data URI or raw base64
            content_str = f.content
            if content_str.startswith("data:") and ";base64," in content_str:
                content_str = content_str.split(";base64,", 1)[1]
            try:
                raw_bytes = base64.b64decode(content_str)
            except Exception:
                # Fallback to utf-8 text encoding
                raw_bytes = f.content.encode("utf-8")

        items.append({"path": f.path, "content": raw_bytes, "is_dir": False})

    result = service_batch_upload_files(
        vault_name,
        body.target_dir,
        items,
        overwrite=body.overwrite,
    )

    # Update index and SSE notifications for uploaded files
    for path in result["uploaded"]:
        try:
            await update_single_file(vault_name, path)
            await sse_manager.broadcast("file_created", {
                "vault": vault_name,
                "path": path,
            })
            await dispatch_webhooks("file_created", {"vault": vault_name, "path": path})
        except Exception as e:
            logger.warning(f"Failed to post-process upload of {path}: {e}")

    # SSE notification for tree refresh
    if result["uploaded"] or result["created_dirs"]:
        await sse_manager.broadcast("tree_updated", {
            "vault": vault_name,
            "target_dir": result["target_dir"],
        })

    return result


@router.patch("/api/file/{vault_name}", response_model=FileRenameResponse)
async def api_file_rename(
    vault_name: str,
    body: FileRenameRequest,
    current_user=Depends(require_auth),
):
    """Rename a file in a vault.

    Args:
        vault_name: Name of the vault.
        body: Request body with current path and new name.

    Returns:
        FileRenameResponse with old and new paths.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    result = service_rename_file(vault_name, body.path, body.new_name)
    old_path_str = result["old_path"]
    new_path_str = result["new_path"]

    # Update index
    await handle_file_move(vault_name, old_path_str, new_path_str)

    # Update bookmarks, history, and shares
    update_bookmarks_after_rename(vault_name, old_path_str, new_path_str)
    update_history_after_rename(vault_name, old_path_str, new_path_str)
    update_shares_after_rename(vault_name, old_path_str, new_path_str)

    # Broadcast SSE event
    await sse_manager.broadcast("file_renamed", {
        "vault": vault_name,
        "old_path": old_path_str,
        "new_path": new_path_str,
    })
    await dispatch_webhooks("file_renamed", {"vault": vault_name, "old_path": old_path_str, "new_path": new_path_str})

    return {"success": True, "old_path": old_path_str, "new_path": new_path_str}


@router.post("/api/move/{vault_name}", response_model=FileMoveResponse)
async def api_file_move(
    vault_name: str,
    body: FileMoveRequest,
    current_user=Depends(require_auth),
):
    """Move a file or directory to a different parent directory within the same vault.

    Supports both files and directories. The item keeps its original name;
    only the parent directory changes.

    Args:
        vault_name: Name of the vault.
        body: Request body with source_path and destination_dir.

    Returns:
        FileMoveResponse with old and new paths.
    """
    if not check_vault_access(vault_name, current_user):
        raise HTTPException(status_code=403, detail=f"Accès refusé à la vault '{vault_name}'")

    result = service_move_path(vault_name, body.source_path, body.destination_dir)
    old_path_str = result["old_path"]
    new_path_str = result["new_path"]
    item_type = result["item_type"]

    # Update index
    if item_type == "directory":
        from backend.indexer import reload_single_vault
        await reload_single_vault(vault_name)
    else:
        await handle_file_move(vault_name, old_path_str, new_path_str)

    # Broadcast SSE event
    await sse_manager.broadcast("item_moved", {
        "vault": vault_name,
        "old_path": old_path_str,
        "new_path": new_path_str,
        "item_type": item_type,
    })
    await dispatch_webhooks("item_moved", {"vault": vault_name, "old_path": old_path_str, "new_path": new_path_str, "item_type": item_type})

    return {"success": True, "old_path": old_path_str, "new_path": new_path_str, "item_type": item_type}