#!/usr/bin/env python3
'''Three-start, no-prior free-lever solve on the frozen P0.5 circle window.'''
from __future__ import annotations
import argparse,json,sys
from dataclasses import asdict
from pathlib import Path
import numpy as np
from scipy.spatial.transform import Rotation
ROOT=Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path: sys.path.insert(0,str(ROOT))
from rtk_imu.rtk_imu_engineering import _height_reference
from rtk_imu.rtk_imu_multisource import load_unified_sessions
from rtk_imu.rtk_imu_node_graph import build_problem,solve_free_lever
from tools.audit_rtk_imu_factor_consistency import MECHANICAL_L_I_M,_jsonable
from tools.run_rtk_imu_node_graph_fixed_lever import _select_window


def main():
    parser=argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--manifest',type=Path,required=True)
    parser.add_argument('--output',type=Path,required=True)
    parser.add_argument('--circle-session',required=True)
    parser.add_argument('--sample-period-s',type=float,default=1.)
    parser.add_argument('--target-duration-s',type=float,default=15.)
    parser.add_argument('--max-nfev',type=int,default=120)
    parser.add_argument('--hpr-direct-sigma-rad',type=float,default=.006)
    parser.add_argument('--rotation-rpy-deg',nargs=3,type=float,
                        default=[.4543066225,-.0026392019,.0122384129])
    parser.add_argument('--mechanical-l-I-m',nargs=3,type=float,
                        default=MECHANICAL_L_I_M.tolist())
    parser.add_argument('--large-perturbation-m',nargs=3,type=float,
                        default=[.5,-.5,.5])
    args=parser.parse_args()
    sessions=load_unified_sessions(
        args.manifest,selected_session_ids={args.circle_session})
    reference=_height_reference(sessions)
    segment,selection=_select_window(
        sessions,reference,args.sample_period_s,args.target_duration_s)
    rotation=Rotation.from_euler('xyz',args.rotation_rpy_deg,degrees=True).as_matrix()
    mechanical=np.asarray(args.mechanical_l_I_m,dtype=float)
    problem=build_problem(segment,rotation,mechanical,args.hpr_direct_sigma_rad)
    starts={'zero':np.zeros(3),'mechanical':mechanical,
            'mechanical_large_perturbation':mechanical+args.large_perturbation_m}
    results={name:asdict(solve_free_lever(problem,value,args.max_nfev))
             for name,value in starts.items()}
    for result in results.values():
        covariance=np.asarray(result['lever_covariance_m2'])
        result['lever_std_m']=np.sqrt(np.maximum(np.diag(covariance),0.))
        result['delta_to_mechanical_m']=np.asarray(result['final_l_I_m'])-mechanical
        result['xy_marginal_covariance_m2']=covariance[:2,:2]
        result['xy_information_singular_values']=np.linalg.svd(
            np.linalg.pinv(covariance[:2,:2],rcond=1e-9),compute_uv=False)
    solutions=np.asarray([value['final_l_I_m'] for value in results.values()])
    spread=float(max(np.linalg.norm(a-b) for a in solutions for b in solutions))
    xy_spread=float(max(np.linalg.norm(a[:2]-b[:2]) for a in solutions for b in solutions))
    circle_xy_observable=bool(all(value['success'] and
        np.all(np.asarray(value['lever_std_m'])[:2]<=.15) for value in results.values()))
    payload={'scope':'circle single-segment no-prior three-start free lever',
        'translation_variable_enabled':True,'manual_prior_used':False,
        'loo_bootstrap_sensitivity_called':False,'selection':selection,
        'fixed_rotation_rpy_deg':args.rotation_rpy_deg,
        'hpr_direct_sigma_rad':args.hpr_direct_sigma_rad,
        'mechanical_reference_m':mechanical,'large_perturbation_m':args.large_perturbation_m,
        'solutions':results,'maximum_solution_spread_m':spread,
        'maximum_xy_solution_spread_m':xy_spread,
        'circle_only_observability_gate':{
            'xy_marginal_std_max_m':.15,'passed':circle_xy_observable},
        'circle_only_data_only_accepted':circle_xy_observable,
        'joint_free_blocked_by_circle_gate':False,
        'covariance_postfit_scaled':False}
    args.output.parent.mkdir(parents=True,exist_ok=True)
    args.output.write_text(json.dumps(_jsonable(payload),ensure_ascii=False,indent=2,
                                      allow_nan=False)+'\n',encoding='utf-8')
    print(json.dumps(_jsonable(payload),ensure_ascii=False,indent=2))
    return 0


if __name__=='__main__':
    raise SystemExit(main())