# crudkit/api/flask_api.py

from __future__ import annotations

from flask import Blueprint, jsonify, request, abort
from urllib.parse import urlencode

from crudkit.api._cursor import encode_cursor, decode_cursor
from crudkit.core.service import _is_truthy


def _bool_param(d: dict[str, str], key: str, default: bool) -> bool:
    return _is_truthy(d.get(key, "1" if default else "0"))


def _safe_int(value: str | None, default: int) -> int:
    try:
        return int(value) if value is not None else default
    except Exception:
        return default


def _link_with_params(base_url: str, **params) -> str:
    q = {k: v for k, v in params.items() if v is not None}
    return f"{base_url}?{urlencode(q)}"


def generate_crud_blueprint(model, service, *, base_prefix: str | None = None, rest: bool = True, rpc: bool = True):
    """
    REST:
      GET    /api/<models>/                -> list (filters via ?q=..., sort=..., limit=..., cursor=...)
      GET    /api/<models>/<id>            -> get
      POST   /api/<models>/                -> create
      PATCH  /api/<models>/<id>            -> update (partial)
      DELETE /api/<models>/<id>[?hard=1]   -> delete

    RPC (legacy):
      GET    /api/<model>/get?id=123
      GET    /api/<model>/list
      GET    /api/<model>/seek_window
      GET    /api/<model>/page
      POST   /api/<model>/create
      PATCH  /api/<model>/update?id=123
      DELETE /api/<model>/delete?id=123[&hard=1]
    """
    model_name = model.__name__.lower()
    # bikeshed if you want pluralization; this is the least-annoying default
    collection = (base_prefix or model_name).lower()
    plural = collection if collection.endswith('s') else f"{collection}s"

    bp = Blueprint(plural, __name__, url_prefix=f"/api/{plural}")

    # ---------- REST ----------
    if rest:
        @bp.get("/")
        def rest_list():
            args = request.args.to_dict(flat=True)
            # support cursor pagination transparently; fall back to limit/offset
            try:
                items = service.list(args)
                return jsonify([o.as_dict() for o in items])
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.get("/<int:obj_id>")
        def rest_get(obj_id: int):
            try:
                item = service.get(obj_id, request.args)
                if item is None:
                    abort(404)
                return jsonify(item.as_dict())
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.post("/")
        def rest_create():
            payload = request.get_json(silent=True) or {}
            try:
                obj = service.create(payload)
                resp = jsonify(obj.as_dict())
                resp.status_code = 201
                resp.headers["Location"] = f"{request.base_url.rstrip('/')}/{obj.id}"
                return resp
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.patch("/<int:obj_id>")
        def rest_update(obj_id: int):
            payload = request.get_json(silent=True) or {}
            try:
                obj = service.update(obj_id, payload)
                return jsonify(obj.as_dict())
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.delete("/<int:obj_id>")
        def rest_delete(obj_id: int):
            hard = (request.args.get("hard") in ("1", "true", "yes"))
            try:
                obj = service.delete(obj_id, hard=hard)
                if obj is None:
                    abort(404)
                return ("", 204)
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

    # ---------- RPC (your existing routes) ----------
    if rpc:
        # your original functions verbatim, shortened here for sanity
        @bp.get("/get")
        def rpc_get():
            id_ = int(request.args.get("id", 0))
            if not id_:
                return jsonify({"status": "error", "error": "missing required param: id"}), 400
            try:
                item = service.get(id_, request.args)
                if item is None:
                    abort(404)
                return jsonify(item.as_dict())
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.get("/list")
        def rpc_list():
            args = request.args.to_dict(flat=True)
            try:
                items = service.list(args)
                return jsonify([obj.as_dict() for obj in items])
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.post("/create")
        def rpc_create():
            payload = request.get_json(silent=True) or {}
            try:
                obj = service.create(payload)
                return jsonify(obj.as_dict()), 201
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.patch("/update")
        def rpc_update():
            id_ = int(request.args.get("id", 0))
            if not id_:
                return jsonify({"status": "error", "error": "missing required param: id"}), 400
            payload = request.get_json(silent=True) or {}
            try:
                obj = service.update(id_, payload)
                return jsonify(obj.as_dict())
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

        @bp.delete("/delete")
        def rpc_delete():
            id_ = int(request.args.get("id", 0))
            if not id_:
                return jsonify({"status": "error", "error": "missing required param: id"}), 400
            hard = (request.args.get("hard") in ("1", "true", "yes"))
            try:
                obj = service.delete(id_, hard=hard)
                return ("", 204) if obj is not None else abort(404)
            except Exception as e:
                return jsonify({"status": "error", "error": str(e)}), 400

    return bp