import os
import json
import datetime
import secrets
from werkzeug.security import generate_password_hash
import config

def read_file(path):
    try:
        if os.path.exists(path):
            with open(path, "r", errors='ignore') as f: return f.read()
    except: pass
    return ""

def write_file(path, content):
    with open(path, "w") as f: f.write(content)

def load_panel_settings():
    default = {
        "templates": {}, "zone_owners": {}, "stats_retention": 30, 
        "query_log_enabled": "no", "allow_transfer": ["none"], 
        "also_notify": [], "allow_query": ["any"],
        "api_key": secrets.token_hex(32), 
        "server_public_ip": "",
        "cluster_nodes": [],
        "master_node": {},
        "adblock_last_update": "Never",
        "adblock_domains_count": 0
    }
    if os.path.exists(config.PANEL_SETTINGS):
        try:
            with open(config.PANEL_SETTINGS, "r") as f:
                data = json.load(f)
                for k, v in default.items():
                    if k not in data: data[k] = v
                # Έλεγχος αν υπάρχει api_key (backward compatibility)
                if "api_key" not in json.loads(read_file(config.PANEL_SETTINGS) or "{}"):
                    write_file(config.PANEL_SETTINGS, json.dumps(data, indent=4))
                return data
        except: pass
    write_file(config.PANEL_SETTINGS, json.dumps(default, indent=4))
    return default

def save_panel_settings(data):
    write_file(config.PANEL_SETTINGS, json.dumps(data, indent=4))

def load_adblock_lists():
    if os.path.exists(config.ADBLOCK_LISTS_FILE):
        try:
            with open(config.ADBLOCK_LISTS_FILE, "r") as f:
                data = json.load(f)
                existing_ids = [l["id"] for l in data]
                for d_list in config.DEFAULT_ADBLOCK_LISTS:
                    if d_list["id"] not in existing_ids:
                        data.append(d_list)
                return data
        except: pass
    write_file(config.ADBLOCK_LISTS_FILE, json.dumps(config.DEFAULT_ADBLOCK_LISTS, indent=4))
    return config.DEFAULT_ADBLOCK_LISTS

def save_adblock_lists(data):
    write_file(config.ADBLOCK_LISTS_FILE, json.dumps(data, indent=4))

def load_custom_rules():
    if os.path.exists(config.ADBLOCK_CUSTOM_RULES_FILE):
        try:
            with open(config.ADBLOCK_CUSTOM_RULES_FILE, "r") as f: return json.load(f)
        except: pass
    return {"allowed": [], "deny": []}

def save_custom_rules(data):
    write_file(config.ADBLOCK_CUSTOM_RULES_FILE, json.dumps(data, indent=4))

def load_users():
    default_admin = {"admin": {"password": generate_password_hash("admin123"), "role": "admin", "assigned_templates": [], "view_mode": "cards"}}
    if not os.path.exists(config.USERS_FILE):
        save_users(default_admin)
        return default_admin
    try:
        with open(config.USERS_FILE, "r") as f:
            users = json.load(f)
            if not users: return default_admin
            for u in users:
                if "view_mode" not in users[u]: users[u]["view_mode"] = "cards"
                if "assigned_templates" not in users[u]: users[u]["assigned_templates"] = []
            return users
    except: return default_admin

def save_users(data):
    write_file(config.USERS_FILE, json.dumps(data, indent=4))

def log_audit(user, domain, action):
    try:
        with open(config.AUDIT_FILE, "r") as f: log = json.load(f)
    except: log = []
    log.insert(0, {"time": datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"), "user": user, "domain": domain, "action": action})
    # Κρατάμε μόνο τις τελευταίες 500 εγγραφές για να μην φουσκώσει το αρχείο
    with open(config.AUDIT_FILE, "w") as f: json.dump(log[:500], f)

def get_audit_log(domain):
    try:
        with open(config.AUDIT_FILE, "r") as f: log = json.load(f)
        return [l for l in log if l['domain'] == domain]
    except: return []