"""
Superadmin-API: Verwaltung von ai_prompts (Templates, Aktivierung, Vorschau).

Kein Vereinsbezug — require_auth + is_superadmin; kein TenantContext.
"""
from __future__ import annotations

from typing import Any, Dict, List, Optional

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field

from auth import require_auth
from club_tenancy import is_superadmin
from db import get_cursor, get_db, r2d
from exercise_ai import build_exercise_placeholder_variables
from prompt_resolver import exercise_placeholder_catalog, render_mustache_template

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


def _require_superadmin(session: dict = Depends(require_auth)) -> dict:
    role = (session.get("role") or "").strip().lower()
    if not is_superadmin(role):
        raise HTTPException(status_code=403, detail="Nur Superadmins")
    return session


def _prompts_table_ready(cur) -> bool:
    cur.execute("SELECT to_regclass(%s)::text AS t", ("public.ai_prompts",))
    row = cur.fetchone()
    if not row:
        return False
    val = row.get("t") if isinstance(row, dict) else row[0]
    return val is not None and str(val).strip() != ""


def _fetch_prompt_any(cur, prompt_id: int) -> Dict[str, Any]:
    cur.execute(
        """
        SELECT id, slug, display_name, description, template, category, output_format,
               output_schema, is_system_default, default_template,
               active, sort_order, created_at, updated_at
        FROM ai_prompts WHERE id = %s
        """,
        (prompt_id,),
    )
    row = cur.fetchone()
    if not row:
        raise HTTPException(status_code=404, detail="Prompt nicht gefunden")
    return dict(row)


class AiPromptUpdateBody(BaseModel):
    template: Optional[str] = None
    active: Optional[bool] = None
    display_name: Optional[str] = Field(None, max_length=200)
    description: Optional[str] = Field(None, max_length=8000)


class AiPromptPreviewFocus(BaseModel):
    focus_area_id: int = Field(..., ge=1)
    is_primary: Optional[bool] = False


class AiPromptPreviewBody(BaseModel):
    title: Optional[str] = ""
    goal: Optional[str] = None
    execution: Optional[str] = None
    focus_hint: Optional[str] = None
    focus_areas_context: Optional[List[AiPromptPreviewFocus]] = None


@router.get("/api/admin/ai-prompts/catalog/placeholders")
def get_ai_prompt_placeholders_catalog(session: dict = Depends(_require_superadmin)):
    return exercise_placeholder_catalog()


@router.get("/api/admin/ai-prompts")
def list_ai_prompts(session: dict = Depends(_require_superadmin)):
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _prompts_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle ai_prompts fehlt.")
        cur.execute(
            """
            SELECT id, slug, display_name, description, category, output_format, active,
                   sort_order, is_system_default, default_template
            FROM ai_prompts
            ORDER BY sort_order ASC NULLS LAST, id ASC
            """
        )
        rows = [r2d(r) if not isinstance(r, dict) else r for r in cur.fetchall()]
    out = []
    for r in rows:
        dt = (r.get("default_template") or "").strip()
        tmpl = (r.get("template") or "").strip()
        is_modified = bool(dt and tmpl != dt)
        rr = {k: v for k, v in r.items() if k != "default_template"}
        rr["is_modified"] = is_modified if dt else False
        rr["has_reference_template"] = bool(dt)
        out.append(rr)
    return out


@router.get("/api/admin/ai-prompts/{prompt_id:int}")
def get_ai_prompt(prompt_id: int, session: dict = Depends(_require_superadmin)):
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _prompts_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle ai_prompts fehlt.")
        row = _fetch_prompt_any(cur, prompt_id)
    dt = (row.get("default_template") or "").strip()
    tmpl = (row.get("template") or "").strip()
    row_out = dict(row)
    row_out["is_modified"] = bool(dt and tmpl != dt) if dt else False
    row_out["has_reference_template"] = bool(dt)
    return row_out


@router.put("/api/admin/ai-prompts/{prompt_id:int}")
def update_ai_prompt(
    prompt_id: int,
    body: AiPromptUpdateBody,
    session: dict = Depends(_require_superadmin),
):
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _prompts_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle ai_prompts fehlt.")
        old = _fetch_prompt_any(cur, prompt_id)

        next_template = old["template"]
        if body.template is not None:
            tpl = body.template.strip() if isinstance(body.template, str) else ""
            if not tpl:
                raise HTTPException(status_code=400, detail="template darf nicht leer sein.")
            next_template = tpl

        next_active = bool(old.get("active", True))
        if body.active is not None:
            next_active = body.active

        next_name = body.display_name if body.display_name is not None else old.get("display_name") or ""
        next_name = (next_name or "").strip()
        if not next_name:
            raise HTTPException(status_code=400, detail="display_name darf nicht leer sein.")

        next_desc = body.description if body.description is not None else old.get("description") or ""
        next_desc = (next_desc or "").strip()

        cur.execute(
            """
            UPDATE ai_prompts
            SET template = %s, active = %s, display_name = %s, description = %s, updated_at = NOW()
            WHERE id = %s
            RETURNING id, slug, display_name, description, template, category, output_format,
                      output_schema, is_system_default, default_template, active, sort_order,
                      created_at, updated_at
            """,
            (next_template, next_active, next_name, next_desc, prompt_id),
        )
        row = dict(cur.fetchone())
        conn.commit()
    dt = (row.get("default_template") or "").strip()
    tmpl = (row.get("template") or "").strip()
    row["is_modified"] = bool(dt and tmpl != dt) if dt else False
    return row


@router.post("/api/admin/ai-prompts/{prompt_id:int}/reset-template")
def reset_ai_prompt_template(prompt_id: int, session: dict = Depends(_require_superadmin)):
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _prompts_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle ai_prompts fehlt.")
        old = _fetch_prompt_any(cur, prompt_id)
        dt_old = old.get("default_template")
        if dt_old is None or not str(dt_old).strip():
            raise HTTPException(
                status_code=400,
                detail="Kein gespeicherter Referenztext (default_template) — Ruecksetzen nicht möglich.",
            )
        cur.execute(
            """
            UPDATE ai_prompts
            SET template = default_template, updated_at = NOW()
            WHERE id = %s AND default_template IS NOT NULL
            RETURNING id, slug, display_name, description, template, category, output_format,
                      output_schema, is_system_default, default_template, active, sort_order,
                      created_at, updated_at
            """,
            (prompt_id,),
        )
        row = cur.fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="Prompt nicht gefunden")
        rr = dict(row)
        conn.commit()
    tmpl = (rr.get("template") or "").strip()
    dt = (rr.get("default_template") or "").strip()
    rr["is_modified"] = bool(dt and tmpl != dt) if dt else False
    return rr


@router.post("/api/admin/ai-prompts/{prompt_id:int}/preview")
def preview_ai_prompt(prompt_id: int, body: AiPromptPreviewBody, session: dict = Depends(_require_superadmin)):
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _prompts_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle ai_prompts fehlt.")
        row = _fetch_prompt_any(cur, prompt_id)
        slug = (row.get("slug") or "").strip().lower()
        tpl_raw = row.get("template") or ""

        fctx_list: Optional[List[tuple[int, bool]]] = None
        if body.focus_areas_context:
            pairs: List[tuple[int, bool]] = []
            for x in body.focus_areas_context:
                pairs.append((int(x.focus_area_id), bool(x.is_primary)))
            fctx_list = pairs

        vars_map: Dict[str, str]
        warn: Optional[str] = None
        if slug in ("exercise_summary", "exercise_skill_suggestions"):
            try:
                vars_map = build_exercise_placeholder_variables(
                    cur,
                    slug=slug,
                    title=(body.title or "").strip(),
                    goal=body.goal,
                    execution=body.execution,
                    focus_area_hint=body.focus_hint,
                    focus_areas_context=fctx_list,
                )
            except ValueError as e:
                raise HTTPException(status_code=400, detail=str(e)) from e
        elif slug == "pipeline":
            vars_map = {}
            warn = "Pipeline-Slug: keine Kontextsubstitution fuer Vorschau."
        else:
            vars_map = {}
            warn = f"Slug {slug!r}: noch kein Vorschau-Kontext definiert — Roh-Template ohne Ersetzung."

        rendered = render_mustache_template(str(tpl_raw), vars_map)
        return {
            "slug": slug,
            "resolved_template": rendered.text,
            "keys_in_template": rendered.keys_in_template,
            "keys_missing_variables": rendered.keys_missing_variables,
            "placeholders_remaining": rendered.placeholders_remaining,
            "warning": warn,
        }