"""A1 — Stage-bound practice exercises (Activity Set)."""

from __future__ import annotations

from datetime import datetime, timezone
from typing import Any, Optional

from services.recurring import (
    create_recurring_element,
    list_recurring_for_initiative,
    update_recurring_element,
)

# Starter exercise sets per stage title (Spagat reference path).
STAGE_PRACTICE_SETS: dict[str, list[tuple[str, str]]] = {
    "Stufe 1 — Basis": [
        ("Vorbeuge-Dehnung", "Täglich 3×30 Sek. — Hüfte und Beinrückseite"),
        ("Hüftöffner (Schmetterling)", "Täglich sitzend, leichter Druck"),
    ],
    "Stufe 2 — Aufbau": [
        ("Seitlicher Spagat — links", "Täglich halten, optional Messwert (Grad)"),
        ("Seitlicher Spagat — rechts", "Täglich halten, optional Messwert (Grad)"),
        ("Aktive Vorbeuge", "Täglich 3× kurz halten"),
    ],
    "Stufe 3 — Ziel": [
        ("Voller Spagat", "Täglich Zielposition — Messwert dokumentieren"),
    ],
}


def get_active_maturity_stage(
    *, tenant_id: str, initiative_id: str
) -> Optional[dict[str, Any]]:
    from services.roadmap import list_roadmap_items_for_initiative

    stages = [
        item
        for item in list_roadmap_items_for_initiative(
            tenant_id=tenant_id, initiative_id=initiative_id
        )
        if item.get("item_type") == "maturity_stage" and item.get("status") == "active"
    ]
    if not stages:
        return None
    stages.sort(key=lambda s: (s.get("sort_order", 0), s.get("title", "")))
    return stages[0]


def enforce_single_active_maturity_stage(
    cur,
    *,
    tenant_id: str,
    initiative_id: str,
    keep_active_id: str,
) -> None:
    """At most one maturity_stage may be active."""
    cur.execute(
        """
        UPDATE roadmap_items
        SET status = 'planned', updated_at = NOW()
        WHERE tenant_id = %s
          AND initiative_id = %s
          AND item_type = 'maturity_stage'
          AND status IN ('active', 'at_risk')
          AND id != %s
        """,
        (tenant_id, initiative_id, keep_active_id),
    )


def list_practices_for_stage(
    *,
    tenant_id: str,
    initiative_id: str,
    stage_id: str,
) -> list[dict[str, Any]]:
    items = list_recurring_for_initiative(
        tenant_id=tenant_id, initiative_id=initiative_id
    )
    return [
        item
        for item in items
        if item.get("roadmap_item_id") == stage_id
    ]


def pause_all_practices(
    *,
    tenant_id: str,
    initiative_id: str,
    user_id: Optional[str] = None,
) -> list[str]:
    paused: list[str] = []
    for item in list_recurring_for_initiative(
        tenant_id=tenant_id, initiative_id=initiative_id
    ):
        if item.get("status") == "active":
            update_recurring_element(
                tenant_id=tenant_id,
                recurring_id=item["id"],
                status="paused",
                user_id=user_id,
            )
            paused.append(item["title"])
    return paused


def seed_practices_for_stage(
    *,
    tenant_id: str,
    initiative_id: str,
    stage: dict[str, Any],
    user_id: Optional[str] = None,
) -> list[dict[str, Any]]:
    """Idempotent: create missing exercises for a stage; activate existing."""
    stage_id = stage["id"]
    stage_title = stage.get("title") or ""
    defs = STAGE_PRACTICE_SETS.get(stage_title)
    if not defs:
        defs = [
            (
                f"Übung — {stage_title}",
                f"Tägliche Routine für {stage_title}",
            )
        ]

    existing = list_practices_for_stage(
        tenant_id=tenant_id,
        initiative_id=initiative_id,
        stage_id=stage_id,
    )
    existing_by_title = {item["title"]: item for item in existing}
    created: list[dict[str, Any]] = []
    now = datetime.now(timezone.utc)

    for title, description in defs:
        if title in existing_by_title:
            item = existing_by_title[title]
            if item.get("status") != "active":
                updated = update_recurring_element(
                    tenant_id=tenant_id,
                    recurring_id=item["id"],
                    status="active",
                    next_due_at=now,
                    user_id=user_id,
                )
                if updated:
                    created.append(updated)
            else:
                created.append(item)
            continue

        row = create_recurring_element(
            tenant_id=tenant_id,
            initiative_id=initiative_id,
            title=title,
            description=description,
            status="active",
            interval_days=1,
            next_due_at=now,
            roadmap_item_id=stage_id,
            user_id=user_id,
        )
        created.append(row)

    return created


def activate_stage_practice_set(
    *,
    tenant_id: str,
    initiative_id: str,
    stage: dict[str, Any],
    user_id: Optional[str] = None,
) -> dict[str, Any]:
    paused = pause_all_practices(
        tenant_id=tenant_id, initiative_id=initiative_id, user_id=user_id
    )
    exercises = seed_practices_for_stage(
        tenant_id=tenant_id,
        initiative_id=initiative_id,
        stage=stage,
        user_id=user_id,
    )
    return {
        "stage_id": stage["id"],
        "stage_title": stage.get("title"),
        "paused_practices": paused,
        "active_practices": [e["title"] for e in exercises],
        "practice_ids": [e["id"] for e in exercises],
    }