from flask import Blueprint, jsonify, request
import time

from services.shap_service import shap_service

shap_bp = Blueprint('shap', __name__, url_prefix='/api/shap')


def log_shap(route, stage, extra=''):
    message = f'[SHAP] route={route} stage={stage}'
    if extra:
        message = f'{message} {extra}'
    print(message, flush=True)


@shap_bp.route('/global', methods=['GET'])
def get_global_importance():
    started_at = time.time()
    try:
        model_type = request.args.get('model', 'random_forest')
        log_shap('/global', 'start', f'model={model_type}')
        result = shap_service.get_global_importance(model_type)
        elapsed = round(time.time() - started_at, 3)
        log_shap('/global', 'success', f'model={model_type} elapsed={elapsed}s')
        return jsonify({'code': 200, 'message': 'success', 'data': result})
    except Exception as e:
        elapsed = round(time.time() - started_at, 3)
        log_shap('/global', 'error', f'elapsed={elapsed}s error={e}')
        return jsonify({'code': 500, 'message': str(e), 'data': None}), 500


@shap_bp.route('/local', methods=['POST'])
def get_local_explanation():
    try:
        data = request.get_json()
        if not data:
            return jsonify({'code': 400, 'message': 'Request body is required', 'data': None}), 400
        model_type = data.get('model_type', 'random_forest')
        result = shap_service.get_local_explanation(data, model_type)
        return jsonify({'code': 200, 'message': 'success', 'data': result})
    except Exception as e:
        return jsonify({'code': 500, 'message': str(e), 'data': None}), 500


@shap_bp.route('/interaction', methods=['GET'])
def get_interactions():
    started_at = time.time()
    try:
        model_type = request.args.get('model', 'random_forest')
        top_n = int(request.args.get('top_n', 10))
        log_shap('/interaction', 'start', f'model={model_type} top_n={top_n}')
        result = shap_service.get_interactions(model_type, top_n)
        elapsed = round(time.time() - started_at, 3)
        log_shap('/interaction', 'success', f'model={model_type} elapsed={elapsed}s')
        return jsonify({'code': 200, 'message': 'success', 'data': result})
    except Exception as e:
        elapsed = round(time.time() - started_at, 3)
        log_shap('/interaction', 'error', f'elapsed={elapsed}s error={e}')
        return jsonify({'code': 500, 'message': str(e), 'data': None}), 500


@shap_bp.route('/dependence', methods=['GET'])
def get_dependence():
    started_at = time.time()
    try:
        feature = request.args.get('feature', '月均加班时长')
        model_type = request.args.get('model', 'random_forest')
        log_shap('/dependence', 'start', f'model={model_type} feature={feature}')
        result = shap_service.get_dependence(feature, model_type)
        elapsed = round(time.time() - started_at, 3)
        log_shap('/dependence', 'success', f'model={model_type} elapsed={elapsed}s')
        return jsonify({'code': 200, 'message': 'success', 'data': result})
    except Exception as e:
        elapsed = round(time.time() - started_at, 3)
        log_shap('/dependence', 'error', f'elapsed={elapsed}s error={e}')
        return jsonify({'code': 500, 'message': str(e), 'data': None}), 500