"""Mock de ejemplo. Replicá esta estructura para tu mock real.

Patrones aplicados:
- /health endpoint (Coolify/Traefik)
- /admin/reset endpoint (para rehearsals)
- Pydantic con coerción de tipos (issue I-003)
- Custom auth header X-Orchestrate-Token (regla C2)
- Logs estructurados como JSON
"""
from __future__ import annotations

import json
import os
import sys
from datetime import datetime, timezone
from typing import Optional

from fastapi import FastAPI, Header, HTTPException
from pydantic import BaseModel, field_validator


# ─── Helpers de coerción (issue I-003) ──────────────────────────────────────

def _coerce_int(v):
    if isinstance(v, str) and v.strip().lstrip("-").isdigit():
        return int(v)
    return v


def _coerce_list(v):
    if isinstance(v, str):
        try:
            return json.loads(v)
        except Exception:
            return [v]
    return v


# ─── Seed data ──────────────────────────────────────────────────────────────

SEED = {
    "users": [
        {"username": "juan.perez", "email": "juan.perez@example.com", "active": True, "department": "Finanzas"},
        {"username": "maria.lopez", "email": "maria.lopez@example.com", "active": True, "department": "Operaciones"},
        {"username": "ana.torres", "email": "ana.torres@example.com", "active": False, "department": "RRHH"},
    ],
}

state: dict = {}


def _reset():
    global state
    state = {"users": [u.copy() for u in SEED["users"]]}


_reset()


# ─── Models ─────────────────────────────────────────────────────────────────

class LookupInput(BaseModel):
    username: str


class ExecuteInput(BaseModel):
    target_id: int
    options: list[str] = []
    notify: bool = True
    _coerce_id = field_validator("target_id", mode="before")(_coerce_int)
    _coerce_opts = field_validator("options", mode="before")(_coerce_list)


# ─── App ────────────────────────────────────────────────────────────────────

app = FastAPI(title="Example Mock")


def _log(event: str, **kwargs):
    """Structured log for Coolify aggregation."""
    payload = {"ts": datetime.now(timezone.utc).isoformat(), "event": event, **kwargs}
    print(json.dumps(payload), file=sys.stdout, flush=True)


def _check_token(token: Optional[str]):
    expected = os.environ.get("MOCK_API_TOKEN")
    if expected and token != expected:
        raise HTTPException(status_code=401, detail="bad token")


@app.get("/health")
def health():
    return {"status": "ok"}


@app.post("/admin/reset")
def admin_reset():
    """Para rehearsals: vuelve al seed."""
    _reset()
    _log("admin.reset")
    return {"reset": True}


@app.post(
    "/users/lookup",
    description="Busca un usuario por username. Devuelve datos del usuario."
)
def lookup_user(
    payload: LookupInput,
    x_orchestrate_token: str | None = Header(default=None),
):
    """Lookup de usuario — para que el agente decida si actuar."""
    _check_token(x_orchestrate_token)
    user = next((u for u in state["users"] if u["username"] == payload.username), None)
    if not user:
        raise HTTPException(status_code=404, detail="user not found")
    _log("tool.lookup_user", username=payload.username, found=True)
    return user


@app.post(
    "/execute",
    description="Ejecuta una acción sobre un target_id. Devuelve resultado."
)
def execute_action(
    payload: ExecuteInput,
    x_orchestrate_token: str | None = Header(default=None),
):
    _check_token(x_orchestrate_token)
    _log("tool.execute", target_id=payload.target_id, options=payload.options)
    return {
        "ok": True,
        "target_id": payload.target_id,
        "completed_at": datetime.now(timezone.utc).isoformat(),
    }