from __future__ import annotations
from datetime import datetime, timezone
from typing import Any
import json
from ..db import connect, default_user_id, utcnow
from . import rtorrent
from .preferences import active_profile


def _loads(value: str | None, default: Any) -> Any:
    try: return json.loads(value or '')
    except Exception: return default


def _ts(value: str | None) -> float:
    if not value: return 0.0
    try: return datetime.fromisoformat(str(value).replace('Z', '+00:00')).timestamp()
    except Exception: return 0.0


def _now_ts() -> float:
    return datetime.now(timezone.utc).timestamp()


def _label_names(value: str | None) -> list[str]:
    seen = []
    for part in str(value or '').replace(';', ',').replace('|', ',').split(','):
        item = part.strip()
        if item and item not in seen: seen.append(item)
    return seen


def _label_value(labels: list[str]) -> str:
    out = []
    for label in labels:
        label = str(label or '').strip()
        if label and label not in out: out.append(label)
    return ', '.join(out)


def _rule_row(row: dict[str, Any]) -> dict[str, Any]:
    item = dict(row)
    item['conditions'] = _loads(item.pop('conditions_json', '[]'), [])
    item['effects'] = _loads(item.pop('effects_json', '[]'), [])
    return item


def list_rules(profile_id: int | None = None, user_id: int | None = None) -> list[dict[str, Any]]:
    user_id = user_id or default_user_id()
    if profile_id is None:
        profile = active_profile(); profile_id = int(profile['id']) if profile else None
    with connect() as conn:
        rows = conn.execute('SELECT * FROM automation_rules WHERE user_id=? AND (profile_id=? OR profile_id IS NULL) ORDER BY enabled DESC, name COLLATE NOCASE', (user_id, profile_id)).fetchall()
    return [_rule_row(r) for r in rows]


def get_rule(rule_id: int, profile_id: int, user_id: int | None = None) -> dict[str, Any]:
    user_id = user_id or default_user_id()
    with connect() as conn:
        row = conn.execute('SELECT * FROM automation_rules WHERE id=? AND user_id=? AND profile_id=?', (rule_id, user_id, profile_id)).fetchone()
    if not row: raise ValueError('Rule not found')
    return _rule_row(row)


def save_rule(profile_id: int, data: dict[str, Any], user_id: int | None = None) -> dict[str, Any]:
    user_id = user_id or default_user_id()
    name = str(data.get('name') or 'Automation rule').strip() or 'Automation rule'
    conditions = data.get('conditions') or []
    effects = data.get('effects') or []
    if not isinstance(conditions, list) or not conditions: raise ValueError('Rule needs at least one condition')
    if not isinstance(effects, list) or not effects: raise ValueError('Rule needs at least one effect')
    cooldown = max(0, int(data.get('cooldown_minutes') or 0))
    enabled = 1 if data.get('enabled', True) else 0
    now = utcnow(); rule_id = int(data.get('id') or 0)
    with connect() as conn:
        if rule_id:
            conn.execute('UPDATE automation_rules SET name=?, enabled=?, conditions_json=?, effects_json=?, cooldown_minutes=?, updated_at=? WHERE id=? AND user_id=? AND profile_id=?', (name, enabled, json.dumps(conditions), json.dumps(effects), cooldown, now, rule_id, user_id, profile_id))
        else:
            cur = conn.execute('INSERT INTO automation_rules(user_id,profile_id,name,enabled,conditions_json,effects_json,cooldown_minutes,created_at,updated_at) VALUES(?,?,?,?,?,?,?,?,?)', (user_id, profile_id, name, enabled, json.dumps(conditions), json.dumps(effects), cooldown, now, now))
            rule_id = int(cur.lastrowid)
    return get_rule(rule_id, profile_id, user_id)


def delete_rule(rule_id: int, profile_id: int, user_id: int | None = None) -> None:
    user_id = user_id or default_user_id()
    with connect() as conn:
        conn.execute('DELETE FROM automation_rules WHERE id=? AND user_id=? AND profile_id=?', (rule_id, user_id, profile_id))
        conn.execute('DELETE FROM automation_rule_state WHERE rule_id=? AND profile_id=?', (rule_id, profile_id))


def list_history(profile_id: int, user_id: int | None = None, limit: int = 30) -> list[dict[str, Any]]:
    user_id = user_id or default_user_id()
    with connect() as conn:
        return conn.execute('SELECT * FROM automation_history WHERE user_id=? AND profile_id=? ORDER BY created_at DESC LIMIT ?', (user_id, profile_id, max(1, min(int(limit or 30), 100)))).fetchall()


def _condition_true(t: dict[str, Any], cond: dict[str, Any]) -> bool:
    typ = str(cond.get('type') or '')
    if typ == 'completed': return bool(int(t.get('complete') or 0))
    if typ == 'no_seeds': return int(t.get('seeds') or 0) <= int(cond.get('seeds') or 0)
    if typ == 'ratio_gte': return float(t.get('ratio') or 0) >= float(cond.get('ratio') or 0)
    if typ == 'label_missing': return str(cond.get('label') or '').strip() not in _label_names(t.get('label'))
    if typ == 'label_has': return str(cond.get('label') or '').strip() in _label_names(t.get('label'))
    if typ == 'status': return str(t.get('status') or '').lower() == str(cond.get('status') or '').lower()
    if typ == 'path_contains': return str(cond.get('text') or '').lower() in str(t.get('path') or '').lower()
    return False


def _conditions_match(conn, rule: dict[str, Any], profile_id: int, t: dict[str, Any]) -> bool:
    h = str(t.get('hash') or '')
    if not h: return False
    immediate_ok = True; delayed_ok = True; now = utcnow(); now_ts = _now_ts()
    for cond in rule.get('conditions') or []:
        raw_ok = _condition_true(t, cond)
        negated = bool(cond.get('negate'))
        ok = (not raw_ok) if negated else raw_ok
        # Note: Conditions can now be negated in automation rules. Timed no-seeds keeps its old delayed behavior only for the positive condition, so old rules do not change.
        if cond.get('type') == 'no_seeds' and int(cond.get('minutes') or 0) > 0 and not negated:
            row = conn.execute('SELECT condition_since_at FROM automation_rule_state WHERE rule_id=? AND profile_id=? AND torrent_hash=?', (rule['id'], profile_id, h)).fetchone()
            if ok:
                since = row['condition_since_at'] if row and row.get('condition_since_at') else now
                conn.execute('INSERT INTO automation_rule_state(rule_id,profile_id,torrent_hash,condition_since_at,last_matched_at,updated_at) VALUES(?,?,?,?,?,?) ON CONFLICT(rule_id,profile_id,torrent_hash) DO UPDATE SET condition_since_at=COALESCE(automation_rule_state.condition_since_at, excluded.condition_since_at), last_matched_at=excluded.last_matched_at, updated_at=excluded.updated_at', (rule['id'], profile_id, h, since, now, now))
                delayed_ok = delayed_ok and (now_ts - _ts(since) >= int(cond.get('minutes') or 0) * 60)
            else:
                conn.execute('UPDATE automation_rule_state SET condition_since_at=NULL, updated_at=? WHERE rule_id=? AND profile_id=? AND torrent_hash=?', (now, rule['id'], profile_id, h)); delayed_ok = False
        else:
            immediate_ok = immediate_ok and ok
    return immediate_ok and delayed_ok


def _cooldown_ok(conn, rule: dict[str, Any], profile_id: int, torrent_hash: str) -> bool:
    cooldown = int(rule.get('cooldown_minutes') or 0)
    row = conn.execute('SELECT last_applied_at FROM automation_rule_state WHERE rule_id=? AND profile_id=? AND torrent_hash=?', (rule['id'], profile_id, torrent_hash)).fetchone()
    if not row or not row.get('last_applied_at'): return True
    return _now_ts() - _ts(row['last_applied_at']) >= cooldown * 60


def _apply_effects(c: Any, profile: dict[str, Any], torrent: dict[str, Any], effects: list[dict[str, Any]]) -> list[dict[str, Any]]:
    h = str(torrent.get('hash') or ''); labels = _label_names(torrent.get('label')); applied = []
    for eff in effects:
        typ = str(eff.get('type') or '')
        if typ == 'move':
            # Note: Automation move-to-path now uses the same move implementation as the main app action.
            path = str(eff.get('path') or '').strip() or rtorrent.default_download_path(profile)
            move_payload = {'path': path, 'move_data': bool(eff.get('move_data')), 'recheck': bool(eff.get('recheck', eff.get('move_data'))), 'keep_seeding': bool(eff.get('keep_seeding'))}
            result = rtorrent.move_torrents(profile, [h], move_payload) if path else None
            if path: applied.append({'type': 'move', 'path': path, 'move_data': bool(eff.get('move_data')), 'recheck': bool(move_payload['recheck']), 'keep_seeding': bool(eff.get('keep_seeding')), 'result': result})
        elif typ == 'add_label':
            label = str(eff.get('label') or '').strip()
            if label and label not in labels: labels.append(label); c.call('d.custom1.set', h, _label_value(labels))
            if label: applied.append({'type': 'add_label', 'label': label})
        elif typ == 'remove_label':
            label = str(eff.get('label') or '').strip(); labels = [x for x in labels if x != label]; c.call('d.custom1.set', h, _label_value(labels)); applied.append({'type': 'remove_label', 'label': label})
        elif typ == 'set_labels':
            value = _label_value(_label_names(eff.get('labels'))); c.call('d.custom1.set', h, value); labels = _label_names(value); applied.append({'type': 'set_labels', 'labels': value})
        elif typ in {'pause', 'stop', 'start', 'resume', 'recheck'}:
            method = {'pause':'d.pause','stop':'d.stop','start':'d.start','resume':'d.resume','recheck':'d.check_hash'}[typ]; c.call(method, h); applied.append({'type': typ})
    return applied


def check(profile: dict | None = None, user_id: int | None = None, force: bool = False) -> dict[str, Any]:
    profile = profile or active_profile()
    if not profile: return {'ok': False, 'error': 'No active rTorrent profile'}
    user_id = user_id or default_user_id(); profile_id = int(profile['id'])
    rules = [r for r in list_rules(profile_id, user_id) if force or int(r.get('enabled') or 0)]
    if not rules: return {'ok': True, 'checked': 0, 'applied': [], 'rules': 0}
    torrents = rtorrent.list_torrents(profile); c = rtorrent.client_for(profile); applied = []; now = utcnow()
    with connect() as conn:
        for rule in rules:
            for t in torrents:
                h = str(t.get('hash') or '')
                if not _conditions_match(conn, rule, profile_id, t): continue
                if not force and not _cooldown_ok(conn, rule, profile_id, h): continue
                try: actions = _apply_effects(c, profile, t, rule.get('effects') or [])
                except Exception as exc: actions = [{'error': str(exc)}]
                conn.execute('INSERT INTO automation_rule_state(rule_id,profile_id,torrent_hash,last_matched_at,last_applied_at,updated_at) VALUES(?,?,?,?,?,?) ON CONFLICT(rule_id,profile_id,torrent_hash) DO UPDATE SET last_matched_at=excluded.last_matched_at, last_applied_at=excluded.last_applied_at, updated_at=excluded.updated_at', (rule['id'], profile_id, h, now, now, now))
                conn.execute('INSERT INTO automation_history(user_id,profile_id,rule_id,torrent_hash,torrent_name,rule_name,actions_json,created_at) VALUES(?,?,?,?,?,?,?,?)', (user_id, profile_id, rule['id'], h, str(t.get('name') or ''), str(rule.get('name') or ''), json.dumps(actions), now))
                applied.append({'rule_id': rule['id'], 'rule_name': rule.get('name'), 'hash': h, 'name': t.get('name'), 'actions': actions})
    return {'ok': True, 'checked': len(torrents), 'rules': len(rules), 'applied': applied}