#!/usr/bin/env python3
#
# Copyright (C) 2021-2022 Intel Corporation.
#
# SPDX-License-Identifier: BSD-3-Clause
#


import sys, os, re
sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', 'library'))
import acrn_config_utilities, board_cfg_lib
from collections import namedtuple
from acrn_config_utilities import get_node

PRE_LAUNCHED_VMS_TYPE = ["SAFETY_VM", "PRE_RT_VM", "PRE_STD_VM"]
POST_LAUNCHED_VMS_TYPE = ["POST_STD_VM", "POST_RT_VM"]
SERVICE_VM_TYPE = ["SERVICE_VM"]

class BusDevFunc(namedtuple(
        "BusDevFunc", [
            "bus",
            "dev",
            "func"])):

    PATTERN = re.compile(r"(?P<bus>[0-9a-f]{2}):(?P<dev>[0-9a-f]{2})\.(?P<func>[0-7]{1})")

    @classmethod
    def from_str(cls, value):
        if not(isinstance(value, str)):
            raise ValueError("value must be a str: {}".format(type(value)))

        match = cls.PATTERN.fullmatch(value)
        if match:
            return BusDevFunc(
                bus=int(match.group("bus"), 16),
                dev=int(match.group("dev"), 16),
                func=int(match.group("func"), 16))
        else:
            raise ValueError("not a bdf: {!r}".format(value))

    def __init__(self, *args, **kwargs):
        if not (0x00 <= self.bus <= 0xff):
            raise ValueError(f"Invalid bus number (0x00 ~ 0xff): {self.bus:#04x}")
        if not (0x00 <= self.dev <= 0x1f):
            raise ValueError(f"Invalid device number (0x00 ~ 0x1f): {self.dev:#04x}")
        if not (0x0 <= self.func <= 0x7):
            raise ValueError(f"Invalid function number (0 ~ 7): {self.func:#x}")

    def __str__(self):
        return f"PTDEV_{self.bus:02x}:{self.dev:02x}.{self.func:x}"

    def __repr__(self):
        return "BusDevFunc.from_str({!r})".format(str(self))

def parse_hv_console(scenario_etree):
    """
    There may be 4 types in the console item
    1. BDF:(00:18.2) seri:/dev/ttyS2
    2. /dev/ttyS2
    3. ttyS2
    4. "None"
    """
    ttys_n = ''
    ttys = get_node("//SERIAL_CONSOLE/text()", scenario_etree)

    if not ttys or ttys == None or ttys == 'None':
        return ttys_n

    if ttys and 'BDF' in ttys or '/dev' in ttys:
        ttys_n = ttys.split('/')[2]
    else:
        ttys_n = ttys

    return ttys_n

def get_native_ttys():
    native_ttys = {}
    ttys_lines = board_cfg_lib.get_info(acrn_config_utilities.BOARD_INFO_FILE, "<TTYS_INFO>", "</TTYS_INFO>")
    if ttys_lines:
        for tty_line in ttys_lines:
            tmp_dic = {}
            #seri:/dev/ttySx type:mmio base:0x91526000 irq:4 [bdf:"00:18.0"]
            #seri:/dev/ttySy type:portio base:0x2f8 irq:5
            tty = tty_line.split('/')[2].split()[0]
            ttys_type = tty_line.split()[1].split(':')[1].strip()
            ttys_base = tty_line.split()[2].split(':')[1].strip()
            ttys_irq = tty_line.split()[3].split(':')[1].strip()
            tmp_dic['type'] = ttys_type
            tmp_dic['base'] = ttys_base
            tmp_dic['irq'] = int(ttys_irq)
            native_ttys[tty] = tmp_dic
    return native_ttys

def get_ivshmem_regions_by_tree(etree):
    ivshmem_enabled = get_ivshmem_enabled_by_tree(etree)
    if ivshmem_enabled == 'n':
        return {}

    ivshmem_regions = etree.xpath("//IVSHMEM_REGION")
    shmem_regions = {}
    for idx in range(len(ivshmem_regions)):
        provided_by = get_node("./PROVIDED_BY/text()", ivshmem_regions[idx])
        if provided_by != "Hypervisor":
            continue
        shm_name = get_node("./NAME/text()", ivshmem_regions[idx])
        if shm_name is None:
            continue
        shm_size = get_node("./IVSHMEM_SIZE/text()", ivshmem_regions[idx])
        shm_vm_list = ivshmem_regions[idx].xpath(".//IVSHMEM_VM")
        for shm_vm in shm_vm_list:
            vm_name = get_node("./VM_NAME/text()", shm_vm)
            vm_id = get_node(f"//vm[name = '{vm_name}']/@id", etree)
            vbdf =  get_node("./VBDF/text()", shm_vm)
            if vm_id not in shmem_regions:
                shmem_regions[vm_id] = {}
            shmem_regions[vm_id][shm_name] = {'id' : str(idx), 'size' : shm_size, 'vbdf' : vbdf}
    return shmem_regions

def get_ivshmem_enabled_by_tree(etree):
    ivshmem_vms = etree.xpath("//IVSHMEM_VM")
    shmem_enabled = 'n'
    if len(ivshmem_vms) != 0:
        shmem_enabled = 'y'
    return shmem_enabled

def is_pre_launched_vm(vm_type):
    if vm_type == 'PRE_LAUNCHED_VM':
        return True
    return False

def is_post_launched_vm(vm_type):
    if vm_type == 'POST_LAUNCHED_VM':
        return True
    return False

def is_service_vm(vm_type):
    if vm_type == 'SERVICE_VM':
        return True
    return False