"""Gestion mémoire long terme — port Mark-XLVIII."""
from __future__ import annotations

import json
import sys
from datetime import datetime
from pathlib import Path
from threading import Lock

_DESKTOP_DIR = Path(__file__).resolve().parent.parent
MEMORY_PATH = _DESKTOP_DIR / "memory" / "long_term.json"
_lock = Lock()
MAX_VALUE_LENGTH = 380
MEMORY_MAX_CHARS = 2200


def _empty_memory() -> dict:
    return {
        "identity": {},
        "preferences": {},
        "projects": {},
        "relationships": {},
        "wishes": {},
        "notes": {},
    }


def load_memory() -> dict:
    if not MEMORY_PATH.exists():
        return _empty_memory()
    with _lock:
        try:
            data = json.loads(MEMORY_PATH.read_text(encoding="utf-8"))
            if isinstance(data, dict):
                base = _empty_memory()
                for key in base:
                    if key not in data:
                        data[key] = {}
                return data
            return _empty_memory()
        except Exception as e:
            print(f"[Memory] Load error: {e}")
            return _empty_memory()


def _all_entries(memory: dict) -> list[tuple]:
    entries = []
    for cat, items in memory.items():
        if not isinstance(items, dict):
            continue
        for key, entry in items.items():
            if isinstance(entry, dict) and "value" in entry:
                entries.append((cat, key, entry))
    return entries


def _trim_to_limit(memory: dict) -> dict:
    if len(json.dumps(memory, ensure_ascii=False)) <= MEMORY_MAX_CHARS:
        return memory
    entries = _all_entries(memory)
    entries.sort(key=lambda t: t[2].get("updated", "0000-00-00"))
    for cat, key, _ in entries:
        if len(json.dumps(memory, ensure_ascii=False)) <= MEMORY_MAX_CHARS:
            break
        del memory[cat][key]
        print(f"[Memory] Trimmed {cat}/{key}")
    return memory


def save_memory(memory: dict) -> None:
    if not isinstance(memory, dict):
        return
    memory = _trim_to_limit(memory)
    MEMORY_PATH.parent.mkdir(parents=True, exist_ok=True)
    with _lock:
        MEMORY_PATH.write_text(
            json.dumps(memory, indent=2, ensure_ascii=False),
            encoding="utf-8",
        )


def _truncate_value(val: str) -> str:
    if isinstance(val, str) and len(val) > MAX_VALUE_LENGTH:
        return val[:MAX_VALUE_LENGTH].rstrip() + "…"
    return val


def _recursive_update(target: dict, updates: dict) -> bool:
    changed = False
    for key, value in updates.items():
        if value is None:
            continue
        if isinstance(value, str) and not value.strip():
            continue
        if isinstance(value, dict) and "value" not in value:
            if key not in target or not isinstance(target[key], dict):
                target[key] = {}
                changed = True
            if _recursive_update(target[key], value):
                changed = True
        else:
            new_val = _truncate_value(str(value["value"] if isinstance(value, dict) else value))
            entry = {"value": new_val, "updated": datetime.now().strftime("%Y-%m-%d")}
            existing = target.get(key, {})
            if not isinstance(existing, dict) or existing.get("value") != new_val:
                target[key] = entry
                changed = True
    return changed


def update_memory(memory_update: dict) -> dict:
    if not isinstance(memory_update, dict) or not memory_update:
        return load_memory()
    memory = load_memory()
    if _recursive_update(memory, memory_update):
        save_memory(memory)
        print(f"[Memory] Saved: {list(memory_update.keys())}")
    return memory


def format_memory_for_prompt(memory: dict | None) -> str:
    if not memory:
        return ""

    lines = []

    identity = memory.get("identity", {})
    id_fields = ["name", "age", "birthday", "city", "job", "language", "school", "nationality"]
    for field in id_fields:
        entry = identity.get(field)
        if entry:
            val = entry.get("value") if isinstance(entry, dict) else entry
            if val:
                lines.append(f"{field.title()}: {val}")
    for key, entry in identity.items():
        if key in id_fields:
            continue
        val = entry.get("value") if isinstance(entry, dict) else entry
        if val:
            lines.append(f"{key.replace('_', ' ').title()}: {val}")

    prefs = memory.get("preferences", {})
    if prefs:
        lines.append("")
        lines.append("Preferences:")
        for key, entry in list(prefs.items())[:15]:
            val = entry.get("value") if isinstance(entry, dict) else entry
            if val:
                lines.append(f"  - {key.replace('_', ' ').title()}: {val}")

    projects = memory.get("projects", {})
    if projects:
        lines.append("")
        lines.append("Active Projects / Goals:")
        for key, entry in list(projects.items())[:8]:
            val = entry.get("value") if isinstance(entry, dict) else entry
            if val:
                lines.append(f"  - {key.replace('_', ' ').title()}: {val}")

    rels = memory.get("relationships", {})
    if rels:
        lines.append("")
        lines.append("People in their life:")
        for key, entry in list(rels.items())[:10]:
            val = entry.get("value") if isinstance(entry, dict) else entry
            if val:
                lines.append(f"  - {key.replace('_', ' ').title()}: {val}")

    wishes = memory.get("wishes", {})
    if wishes:
        lines.append("")
        lines.append("Wishes / Plans / Wants:")
        for key, entry in list(wishes.items())[:8]:
            val = entry.get("value") if isinstance(entry, dict) else entry
            if val:
                lines.append(f"  - {key.replace('_', ' ').title()}: {val}")

    notes = memory.get("notes", {})
    if notes:
        lines.append("")
        lines.append("Other notes:")
        for key, entry in list(notes.items())[:8]:
            val = entry.get("value") if isinstance(entry, dict) else entry
            if val:
                lines.append(f"  - {key}: {val}")

    if not lines:
        return ""

    header = "[WHAT YOU KNOW ABOUT THIS PERSON — use naturally, never recite like a list]\n"
    result = header + "\n".join(lines)
    if len(result) > 2000:
        result = result[:1997] + "…"

    return result + "\n"


def remember(key: str, value: str, category: str = "notes") -> str:
    valid = {"identity", "preferences", "projects", "relationships", "wishes", "notes"}
    if category not in valid:
        category = "notes"
    update_memory({category: {key: {"value": value}}})
    return f"Remembered: {category}/{key} = {value}"


def forget(key: str, category: str = "notes") -> str:
    memory = load_memory()
    cat = memory.get(category, {})
    if key in cat:
        del cat[key]
        memory[category] = cat
        save_memory(memory)
        return f"Forgotten: {category}/{key}"
    return f"Not found: {category}/{key}"


forget_memory = forget