"""
Module Registry — controls which tool modules are active.

Enable/disable via .env:
  ENABLED_MODULES=documents,doctypes,users   → whitelist mode
  MODULE_SCHEDULER=false                      → disable one module
  MODULE_GOVERNANCE=false                     → disable another

Default: all modules enabled.
"""

import os
from typing import Callable
from mcp.types import Tool

# ── Import all tool modules ──────────────────────────────────────────────────
from frappe_mcp.tools import (
    foundation,
    doctypes,
    documents,
    document_inspect,
    document_lifecycle,
    custom_fields,
    scripts,
    workflow_tools,
    users,
    admin,
    analytics,
    print_formats,
    email_templates,
    property_setters,
    naming_series,
    bulk_ops,
    files,
    activity,
    dashboards,
    webhooks,
    reports,
    scheduler,
    translations,
    business_actions,
    governance,
)

# ── Module definitions ───────────────────────────────────────────────────────
# (module_key, module_object, description)
ALL_MODULES: list[tuple[str, object, str]] = [
    # Level 1 — Foundation
    ("foundation",          foundation,          "L1: ping, session_info, doctype_meta, permissions, modules"),
    # Level 2 — Read
    ("doctypes",            doctypes,            "L1-2: DocType CRUD — create, read, update, list"),
    ("documents",           documents,           "L2-3: Document CRUD — create, read, update, delete, submit, cancel"),
    ("document_inspect",    document_inspect,    "L2: Search, children, linked docs, timeline, count, attachments"),
    # Level 3-4 — Write + Lifecycle
    ("document_lifecycle",  document_lifecycle,  "L3-4: Child rows, rename, amend, duplicate, status, draft save"),
    ("custom_fields",       custom_fields,       "L2/9: Custom Fields — add, edit, remove, list"),
    ("scripts",             scripts,             "L9: Server Scripts + Client Scripts"),
    # Level 5 — Workflow
    ("workflow_tools",      workflow_tools,      "L5: Workflows, transitions, approvals"),
    # Level 6 — Reporting
    ("analytics",           analytics,           "L6: Aggregate, dashboard data, PDF render, number cards"),
    ("reports",             reports,             "L6/9: Query/Script Report CRUD"),
    ("print_formats",       print_formats,       "L6: Print Format templates"),
    # Level 7 — Bulk
    ("bulk_ops",            bulk_ops,            "L7: Bulk create/update/delete/submit/cancel/assign/tag"),
    # Level 8 — Business Actions
    ("business_actions",    business_actions,    "L8: ERPNext shortcuts — Sales, Buying, Stock, HR, Support, Projects"),
    # Level 9 — Admin / System Intelligence
    ("users",               users,               "L9: Users, Roles, DocType permissions"),
    ("admin",               admin,               "L9: Cache, system settings, SQL, workflows, scheduler"),
    ("property_setters",    property_setters,    "L9: Property Setters + Customize Form"),
    ("naming_series",       naming_series,       "L9: Naming Series — patterns and counters"),
    ("files",               files,               "L2/9: File Manager — upload, list, delete, move"),
    ("activity",            activity,            "L2/9: Comments, tags, assignments, ToDo, error logs"),
    ("dashboards",          dashboards,          "L6/9: Dashboards, charts, number cards, workspaces"),
    ("webhooks",            webhooks,            "L9: Webhooks + API Keys"),
    ("email_templates",     email_templates,     "L9: Email Templates + Notifications"),
    ("translations",        translations,        "L9: Translations, Assignment Rules, User Permissions"),
    ("scheduler",           scheduler,           "L9: Scheduled Jobs + Background Jobs"),
    # Level 10 — Safety & Governance
    ("governance",          governance,          "L10: Dry run, validate, risk score, audit log, rollback"),
]


def _is_module_enabled(key: str) -> bool:
    """
    Resolution order (first match wins):
    1. MODULE_<KEY>=false  → disabled
    2. MODULE_<KEY>=true   → enabled
    3. ENABLED_MODULES=a,b → whitelist — only listed enabled
    4. Default: enabled
    """
    env_key = f"MODULE_{key.upper()}"
    explicit = os.environ.get(env_key, "").strip().lower()
    if explicit == "false":
        return False
    if explicit == "true":
        return True

    enabled_list = os.environ.get("ENABLED_MODULES", "").strip()
    if enabled_list:
        return key in [m.strip() for m in enabled_list.split(",")]

    return True


def get_enabled_tools() -> list[Tool]:
    tools: list[Tool] = []
    for key, module, _ in ALL_MODULES:
        if _is_module_enabled(key):
            tools.extend(module.tools())
    return tools


def get_enabled_handlers() -> dict[str, Callable]:
    handlers: dict[str, Callable] = {}
    for key, module, _ in ALL_MODULES:
        if _is_module_enabled(key):
            handlers.update(module.handlers())
    return handlers


def print_module_status():
    print("\nFrappe MCP — Module Status")
    print("=" * 70)
    total_on = 0
    total_all = 0
    for key, module, desc in ALL_MODULES:
        enabled = _is_module_enabled(key)
        count = len(module.tools())
        total_all += count
        if enabled:
            total_on += count
        status = "ON " if enabled else "OFF"
        print(f"  [{status}]  {key:<22} ({count:>2} tools)  {desc}")
    print("=" * 70)
    print(f"  Active: {total_on} tools  |  Total available: {total_all} tools\n")