"""Rulebook / topic REST endpoints.

Wraps services/rulebooks.py. Standard Scribe auth: g.user.id is the
authenticated owner; the service enforces ownership scoping.
"""
from __future__ import annotations

from quart import Blueprint, g, jsonify, request

from scribe.auth import login_required
import scribe.services.rulebooks as rulebooks_svc
from scribe.services.trash import delete as trash_delete

rulebooks_bp = Blueprint("rulebooks", __name__, url_prefix="/api")


def _uid() -> int:
    return g.user.id


# ── Rulebooks ───────────────────────────────────────────────────────────

@rulebooks_bp.get("/rulebooks")
@login_required
async def list_rulebooks():
    rows = await rulebooks_svc.list_rulebooks(_uid())
    return jsonify({"rulebooks": [rb.to_dict() for rb in rows]})


@rulebooks_bp.post("/rulebooks")
@login_required
async def create_rulebook():
    data = await request.get_json() or {}
    title = (data.get("title") or "").strip()
    if not title:
        return jsonify({"error": "title is required"}), 400
    rb = await rulebooks_svc.create_rulebook(
        user_id=_uid(),
        title=title,
        description=data.get("description", ""),
    )
    return jsonify(rb.to_dict()), 201


@rulebooks_bp.get("/rulebooks/<int:rulebook_id>")
@login_required
async def get_rulebook(rulebook_id: int):
    rb = await rulebooks_svc.get_rulebook(rulebook_id, _uid())
    if rb is None:
        return jsonify({"error": "rulebook not found"}), 404
    return jsonify(rb.to_dict())


@rulebooks_bp.patch("/rulebooks/<int:rulebook_id>")
@login_required
async def update_rulebook(rulebook_id: int):
    data = await request.get_json() or {}
    fields = {k: v for k, v in data.items() if k in ("title", "description", "always_on")}
    rb = await rulebooks_svc.update_rulebook(rulebook_id, _uid(), **fields)
    if rb is None:
        return jsonify({"error": "rulebook not found"}), 404
    return jsonify(rb.to_dict())


@rulebooks_bp.delete("/rulebooks/<int:rulebook_id>")
@login_required
async def delete_rulebook(rulebook_id: int):
    await trash_delete(_uid(), "rulebook", rulebook_id)
    return "", 204


# ── Topics ──────────────────────────────────────────────────────────────

@rulebooks_bp.get("/rulebooks/<int:rulebook_id>/topics")
@login_required
async def list_topics(rulebook_id: int):
    try:
        rows = await rulebooks_svc.list_topics(rulebook_id, _uid())
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return jsonify({"topics": [t.to_dict() for t in rows]})


@rulebooks_bp.post("/rulebooks/<int:rulebook_id>/topics")
@login_required
async def create_topic(rulebook_id: int):
    data = await request.get_json() or {}
    title = (data.get("title") or "").strip()
    if not title:
        return jsonify({"error": "title is required"}), 400
    try:
        topic = await rulebooks_svc.create_topic(
            rulebook_id=rulebook_id,
            user_id=_uid(),
            title=title,
            description=data.get("description", ""),
            order_index=data.get("order_index", 0),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return jsonify(topic.to_dict()), 201


@rulebooks_bp.patch("/rulebook-topics/<int:topic_id>")
@login_required
async def update_topic(topic_id: int):
    data = await request.get_json() or {}
    fields = {
        k: v for k, v in data.items()
        if k in ("title", "description", "order_index")
    }
    topic = await rulebooks_svc.update_topic(topic_id, _uid(), **fields)
    if topic is None:
        return jsonify({"error": "topic not found"}), 404
    return jsonify(topic.to_dict())


@rulebooks_bp.delete("/rulebook-topics/<int:topic_id>")
@login_required
async def delete_topic(topic_id: int):
    if await trash_delete(_uid(), "topic", topic_id) is None:
        return jsonify({"error": "topic not found"}), 404
    return "", 204


# ── Rules ───────────────────────────────────────────────────────────────

@rulebooks_bp.get("/rules")
@login_required
async def list_rules():
    def _opt_int(name):
        raw = request.args.get(name)
        return int(raw) if raw else None

    try:
        rulebook_id = _opt_int("rulebook_id")
        topic_id = _opt_int("topic_id")
        project_id = _opt_int("project_id")
    except ValueError:
        return jsonify({"error": "rulebook_id, topic_id, project_id must be integers"}), 400

    rows = await rulebooks_svc.list_rules(
        user_id=_uid(),
        rulebook_id=rulebook_id,
        topic_id=topic_id,
        project_id=project_id,
    )
    return jsonify({"rules": [r.to_dict() for r in rows]})


@rulebooks_bp.post("/rulebook-topics/<int:topic_id>/rules")
@login_required
async def create_rule(topic_id: int):
    data = await request.get_json() or {}
    title = (data.get("title") or "").strip()
    statement = (data.get("statement") or "").strip()
    if not title or not statement:
        return jsonify({"error": "title and statement are required"}), 400
    try:
        rule = await rulebooks_svc.create_rule(
            topic_id=topic_id,
            user_id=_uid(),
            title=title,
            statement=statement,
            why=data.get("why", ""),
            how_to_apply=data.get("how_to_apply", ""),
            order_index=data.get("order_index", 0),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return jsonify(rule.to_dict()), 201


@rulebooks_bp.get("/rules/<int:rule_id>")
@login_required
async def get_rule(rule_id: int):
    rule = await rulebooks_svc.get_rule(rule_id, _uid())
    if rule is None:
        return jsonify({"error": "rule not found"}), 404
    return jsonify(rule.to_dict())


@rulebooks_bp.patch("/rules/<int:rule_id>")
@login_required
async def update_rule(rule_id: int):
    data = await request.get_json() or {}
    fields = {
        k: v for k, v in data.items()
        if k in ("title", "statement", "why", "how_to_apply", "order_index")
    }
    rule = await rulebooks_svc.update_rule(rule_id, _uid(), **fields)
    if rule is None:
        return jsonify({"error": "rule not found"}), 404
    return jsonify(rule.to_dict())


@rulebooks_bp.delete("/rules/<int:rule_id>")
@login_required
async def delete_rule(rule_id: int):
    if await trash_delete(_uid(), "rule", rule_id) is None:
        return jsonify({"error": "rule not found"}), 404
    return "", 204


# ── Subscriptions ──────────────────────────────────────────────────────

@rulebooks_bp.post("/projects/<int:project_id>/rulebook-subscriptions")
@login_required
async def subscribe_project(project_id: int):
    data = await request.get_json() or {}
    rulebook_id = data.get("rulebook_id")
    if not rulebook_id:
        return jsonify({"error": "rulebook_id is required"}), 400
    try:
        await rulebooks_svc.subscribe_project(
            project_id=project_id, rulebook_id=int(rulebook_id), user_id=_uid(),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return "", 204


@rulebooks_bp.delete(
    "/projects/<int:project_id>/rulebook-subscriptions/<int:rulebook_id>"
)
@login_required
async def unsubscribe_project(project_id: int, rulebook_id: int):
    try:
        await rulebooks_svc.unsubscribe_project(
            project_id=project_id, rulebook_id=rulebook_id, user_id=_uid(),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return "", 204


@rulebooks_bp.get("/projects/<int:project_id>/rules")
@login_required
async def get_project_rules(project_id: int):
    result = await rulebooks_svc.get_applicable_rules(
        project_id=project_id, user_id=_uid(),
    )
    return jsonify(result)


@rulebooks_bp.post("/projects/<int:project_id>/suppressions/rules/<int:rule_id>")
@login_required
async def suppress_project_rule(project_id: int, rule_id: int):
    try:
        await rulebooks_svc.suppress_rule_for_project(
            project_id=project_id, rule_id=rule_id, user_id=_uid(),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return "", 204


@rulebooks_bp.delete("/projects/<int:project_id>/suppressions/rules/<int:rule_id>")
@login_required
async def unsuppress_project_rule(project_id: int, rule_id: int):
    try:
        await rulebooks_svc.unsuppress_rule_for_project(
            project_id=project_id, rule_id=rule_id, user_id=_uid(),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return "", 204


@rulebooks_bp.post("/projects/<int:project_id>/suppressions/topics/<int:topic_id>")
@login_required
async def suppress_project_topic(project_id: int, topic_id: int):
    try:
        await rulebooks_svc.suppress_topic_for_project(
            project_id=project_id, topic_id=topic_id, user_id=_uid(),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return "", 204


@rulebooks_bp.delete("/projects/<int:project_id>/suppressions/topics/<int:topic_id>")
@login_required
async def unsuppress_project_topic(project_id: int, topic_id: int):
    try:
        await rulebooks_svc.unsuppress_topic_for_project(
            project_id=project_id, topic_id=topic_id, user_id=_uid(),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return "", 204


@rulebooks_bp.post("/projects/<int:project_id>/rules")
@login_required
async def create_project_rule(project_id: int):
    """Create a rule scoped to a single project. Frontend fast path."""
    data = await request.get_json() or {}
    statement = (data.get("statement") or "").strip()
    if not statement:
        return jsonify({"error": "statement is required"}), 400
    title = (data.get("title") or "").strip() or statement.split(".")[0][:50]
    try:
        rule = await rulebooks_svc.create_project_rule(
            project_id=project_id,
            user_id=_uid(),
            title=title,
            statement=statement,
            why=data.get("why", ""),
            how_to_apply=data.get("how_to_apply", ""),
            order_index=data.get("order_index", 0),
        )
    except ValueError as exc:
        return jsonify({"error": str(exc)}), 404
    return jsonify(rule.to_dict()), 201