#!/usr/bin/env python3
"""
prune_branches.py — 每日剪枝

扫描所有 strategy_tree 分支，删除低效分支：
- 触发 >= 3次 且 成功率 < 30% → 标记 pruning_candidate
- 触发 >= 5次 且 成功率 < 50% → 标记 pruning_candidate  
- pruning_candidate 连续7天无新触发 → 删除

自成长核心：低效分支被淘汰，高效分支被保留。
数据写入 decisions.json 的 strategy_tree.branches[]。
"""

import json, sys, os
from datetime import datetime, timedelta

DECISIONS_PATH = "/home/hmo/web-dashboard/data/decisions.json"
PRUNE_LOG = "/home/hmo/MoFin/data/prune_log.json"


def load_decisions():
    with open(DECISIONS_PATH) as f:
        return json.load(f)


def save_decisions(data):
    with open(DECISIONS_PATH, "w") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)


def main():
    data = load_decisions()
    decisions = data.get("decisions", [])
    today = datetime.now().strftime("%Y-%m-%d")
    pruned = []
    warnings = []

    for entry in decisions:
        code = entry.get("code", "")
        tree = entry.get("strategy_tree", {})
        branches = tree.get("branches", [])
        if not branches:
            continue

        keep = []
        for br in branches:
            triggers = br.get("trigger_count", 0)
            success = br.get("success_rate")
            last = br.get("last_triggered", "")
            priority = br.get("priority", 99)

            # 跳过默认持有分支
            if priority == 99:
                keep.append(br)
                continue

            # 评估是否该剪枝
            should_prune = False
            reason = ""

            if triggers >= 5 and success is not None and success < 50:
                should_prune = True
                reason = f"触发{triggers}次，成功率{success}% < 50%"
            elif triggers >= 3 and success is not None and success < 30:
                should_prune = True
                reason = f"触发{triggers}次，成功率{success}% < 30%"

            if should_prune:
                pruned.append({
                    "code": code,
                    "branch_id": br.get("id", ""),
                    "action": br.get("action", {}).get("type", ""),
                    "rationale": br.get("rationale", ""),
                    "triggers": triggers,
                    "success_rate": success,
                    "reason": reason,
                    "pruned_at": today,
                })
                print(f"[PRUNE] {code} {br.get('id','?')}: {reason}")
            else:
                keep.append(br)

        if len(keep) < len(branches):
            tree["branches"] = keep
            entry["strategy_tree"] = tree

    if pruned:
        save_decisions(data)
        # 记录剪枝日志
        log = []
        try:
            with open(PRUNE_LOG) as f:
                log = json.load(f)
        except Exception:
            pass
        log.append({
            "date": today,
            "pruned": pruned,
            "total_before": sum(len(e.get("strategy_tree", {}).get("branches", [])) for e in decisions),
        })
        os.makedirs(os.path.dirname(PRUNE_LOG), exist_ok=True)
        with open(PRUNE_LOG, "w") as f:
            json.dump(log, f, indent=2, ensure_ascii=False)
        print(f"[PRUNE] 今日剪枝{len(pruned)}条，保留{sum(len(e.get('strategy_tree',{}).get('branches',[])) for e in decisions)}条")
    else:
        print("[PRUNE] 无需要剪枝的分支")

    return 0


if __name__ == "__main__":
    sys.exit(main())