# emotion_predictor.py
import os
from pathlib import Path

import json
import torch
import matplotlib
matplotlib.use("Agg")  # 서버/헤드리스 환경
import matplotlib.pyplot as plt
import base64
from io import BytesIO
from collections import defaultdict

from models.model_loader import load_kote_model
from utils.emotion_utils import (
    parse_dialogue, adjusted_score, apply_ema,
    LABELS, NEGATIVE_EMOTIONS, detect_emotion_spikes, infer_conflict_initiator
)
from utils.prediction_utils import forecast_scores
from report.report_generator import generate_text_report

from utils.plot_fonts import setup_korean_font
ROOT_DIR = Path(__file__).resolve().parent
setup_korean_font(project_root=ROOT_DIR)

# 글로벌 캐시 로딩 (서버 시작시 1회)
MODEL = load_kote_model()

def _score_sentence(text: str):
    with torch.no_grad():
        probs = MODEL(text)[0].cpu().numpy().tolist()
    # {label: prob} 사전
    return {label: float(p) for label, p in zip(LABELS, probs)}

def analyze_dialogue(raw_text: str, smooth_alpha=0.4, z_thresh=1.8, forecast_steps=3):
    """
    입력: "화자:문장" 줄 형식의 대화 텍스트
    출력: (리포트 텍스트, 플롯(base64), 중간 구조 데이터)
    """
    dialogue = parse_dialogue(raw_text)
    if not dialogue:
        return "대화가 비어있습니다.", None, {}

    # 발화별 부정 감정 점수 기록
    per_speaker_series = defaultdict(lambda: defaultdict(list))
    per_utt_log = []

    for idx, (speaker, sentence) in enumerate(dialogue):
        label2prob = _score_sentence(sentence)
        neg_emotions = {}
        for lb in NEGATIVE_EMOTIONS:
            raw = label2prob.get(lb, 0.0)
            adj = adjusted_score(raw)  # 0~100
            neg_emotions[lb] = round(adj, 2)
            per_speaker_series[speaker][lb].append(adj)

        per_utt_log.append({
            "utterance_idx": idx,
            "speaker": speaker,
            "text": sentence,
            "negative_emotions": neg_emotions
        })

    # 스무딩 + 급변 탐지 + 예측
    spikes_by_speaker = defaultdict(list)
    future_alerts = defaultdict(list)

    plot_buf = BytesIO()
    plt.figure(figsize=(11, 4))

    speakers = list(per_speaker_series.keys())
    for spk in speakers:
        # 부정 감정 중 상위 변화 항목만 시각화 (가독성)
        # 기준: 마지막 값 기준 top-3
        last_scores = [(lb, per_speaker_series[spk][lb][-1]) for lb in NEGATIVE_EMOTIONS if per_speaker_series[spk][lb]]
        top = sorted(last_scores, key=lambda x: -x[1])[:3]
        plotted = False

        for lb, _ in top:
            raw = per_speaker_series[spk][lb]
            sm = apply_ema(raw, alpha=smooth_alpha)
            if len(sm) < 2:
                continue

            # 급변 탐지
            spikes = detect_emotion_spikes(sm, z_thresh=z_thresh, min_len=5)
            for s in spikes:
                # s: (idx, score, z)
                spikes_by_speaker[spk].append(s)

            # 예측
            fut = forecast_scores(sm, steps=forecast_steps)

            # 시각화
            x_obs = list(range(len(sm)))
            plt.plot(x_obs, sm, label=f"{spk}-{lb}")
            x_fut = [len(sm)+i for i in range(1, forecast_steps+1)]
            plt.plot(x_fut, fut, linestyle="--")

            # 경고 로직: 향후 점수 80 이상 시 경고
            if any(v >= 80.0 for v in fut):
                future_alerts[spk].append(f"'{lb}' 감정이 향후 {forecast_steps}턴 내 80+ 도달 가능")

            plotted = True

        # 스피커별 라벨링 최소 1개라도 그려졌는지
        if not plotted:
            # 아무 라벨도 기준 통과 못하면 상위 1개라도 그리기
            any_lb = next(iter(per_speaker_series[spk]), None)
            if any_lb:
                sm = apply_ema(per_speaker_series[spk][any_lb], alpha=smooth_alpha)
                if len(sm) >= 2:
                    plt.plot(range(len(sm)), sm, label=f"{spk}-{any_lb}")

    plt.title("부정 감정 흐름(EMA) 및 예측")
    plt.xlabel("발화 순서")
    plt.ylabel("감정 점수(0~100)")
    plt.grid(True)
    plt.legend()
    plt.tight_layout()
    plt.savefig(plot_buf, format="png")
    plt.close()

    img_b64 = base64.b64encode(plot_buf.getvalue()).decode("utf-8")

    # 갈등 유발자 추정
    initiator = infer_conflict_initiator(dialogue, spikes_by_speaker)

    # 리포트 텍스트 생성
    report_text = generate_text_report(initiator, spikes_by_speaker, per_utt_log, future_alerts)

    result_struct = {
        "dialogue": dialogue,
        "per_utt_log": per_utt_log,
        "spikes_by_speaker": {k: v for k, v in spikes_by_speaker.items()},
        "future_alerts": {k: v for k, v in future_alerts.items()},
        "initiator": initiator
    }
    return report_text, img_b64, result_struct