import re

import esphome.codegen as cg
import esphome.config_validation as cv
from esphome import automation
from esphome.automation import LambdaAction
from esphome.const import (
    CONF_ARGS,
    CONF_BAUD_RATE,
    CONF_FORMAT,
    CONF_HARDWARE_UART,
    CONF_ID,
    CONF_LEVEL,
    CONF_LOGS,
    CONF_ON_MESSAGE,
    CONF_TAG,
    CONF_TRIGGER_ID,
    CONF_TX_BUFFER_SIZE,
)
from esphome.core import CORE, EsphomeError, Lambda, coroutine_with_priority

CODEOWNERS = ["@esphome/core"]
logger_ns = cg.esphome_ns.namespace("logger")
LOG_LEVELS = {
    "NONE": cg.global_ns.ESPHOME_LOG_LEVEL_NONE,
    "ERROR": cg.global_ns.ESPHOME_LOG_LEVEL_ERROR,
    "WARN": cg.global_ns.ESPHOME_LOG_LEVEL_WARN,
    "INFO": cg.global_ns.ESPHOME_LOG_LEVEL_INFO,
    "DEBUG": cg.global_ns.ESPHOME_LOG_LEVEL_DEBUG,
    "VERBOSE": cg.global_ns.ESPHOME_LOG_LEVEL_VERBOSE,
    "VERY_VERBOSE": cg.global_ns.ESPHOME_LOG_LEVEL_VERY_VERBOSE,
}

LOG_LEVEL_TO_ESP_LOG = {
    "ERROR": cg.global_ns.ESP_LOGE,
    "WARN": cg.global_ns.ESP_LOGW,
    "INFO": cg.global_ns.ESP_LOGI,
    "DEBUG": cg.global_ns.ESP_LOGD,
    "VERBOSE": cg.global_ns.ESP_LOGV,
    "VERY_VERBOSE": cg.global_ns.ESP_LOGVV,
}

LOG_LEVEL_SEVERITY = [
    "NONE",
    "ERROR",
    "WARN",
    "INFO",
    "CONFIG",
    "DEBUG",
    "VERBOSE",
    "VERY_VERBOSE",
]

UART_SELECTION_ESP32 = ["UART0", "UART1", "UART2"]

UART_SELECTION_ESP8266 = ["UART0", "UART0_SWAP", "UART1"]

HARDWARE_UART_TO_UART_SELECTION = {
    "UART0": logger_ns.UART_SELECTION_UART0,
    "UART0_SWAP": logger_ns.UART_SELECTION_UART0_SWAP,
    "UART1": logger_ns.UART_SELECTION_UART1,
    "UART2": logger_ns.UART_SELECTION_UART2,
}

HARDWARE_UART_TO_SERIAL = {
    "UART0": cg.global_ns.Serial,
    "UART0_SWAP": cg.global_ns.Serial,
    "UART1": cg.global_ns.Serial1,
    "UART2": cg.global_ns.Serial2,
}

is_log_level = cv.one_of(*LOG_LEVELS, upper=True)


def uart_selection(value):
    if CORE.is_esp32:
        return cv.one_of(*UART_SELECTION_ESP32, upper=True)(value)
    if CORE.is_esp8266:
        return cv.one_of(*UART_SELECTION_ESP8266, upper=True)(value)
    raise NotImplementedError


def validate_local_no_higher_than_global(value):
    global_level = value.get(CONF_LEVEL, "DEBUG")
    for tag, level in value.get(CONF_LOGS, {}).items():
        if LOG_LEVEL_SEVERITY.index(level) > LOG_LEVEL_SEVERITY.index(global_level):
            raise EsphomeError(
                "The local log level {} for {} must be less severe than the "
                "global log level {}.".format(level, tag, global_level)
            )
    return value


Logger = logger_ns.class_("Logger", cg.Component)
LoggerMessageTrigger = logger_ns.class_(
    "LoggerMessageTrigger",
    automation.Trigger.template(cg.int_, cg.const_char_ptr, cg.const_char_ptr),
)

CONF_ESP8266_STORE_LOG_STRINGS_IN_FLASH = "esp8266_store_log_strings_in_flash"
CONFIG_SCHEMA = cv.All(
    cv.Schema(
        {
            cv.GenerateID(): cv.declare_id(Logger),
            cv.Optional(CONF_BAUD_RATE, default=115200): cv.positive_int,
            cv.Optional(CONF_TX_BUFFER_SIZE, default=512): cv.validate_bytes,
            cv.Optional(CONF_HARDWARE_UART, default="UART0"): uart_selection,
            cv.Optional(CONF_LEVEL, default="DEBUG"): is_log_level,
            cv.Optional(CONF_LOGS, default={}): cv.Schema(
                {
                    cv.string: is_log_level,
                }
            ),
            cv.Optional(CONF_ON_MESSAGE): automation.validate_automation(
                {
                    cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(LoggerMessageTrigger),
                    cv.Optional(CONF_LEVEL, default="WARN"): is_log_level,
                }
            ),
            cv.SplitDefault(
                CONF_ESP8266_STORE_LOG_STRINGS_IN_FLASH, esp8266=True
            ): cv.All(cv.only_on_esp8266, cv.boolean),
        }
    ).extend(cv.COMPONENT_SCHEMA),
    validate_local_no_higher_than_global,
)


@coroutine_with_priority(90.0)
async def to_code(config):
    baud_rate = config[CONF_BAUD_RATE]
    rhs = Logger.new(
        baud_rate,
        config[CONF_TX_BUFFER_SIZE],
        HARDWARE_UART_TO_UART_SELECTION[config[CONF_HARDWARE_UART]],
    )
    log = cg.Pvariable(config[CONF_ID], rhs)
    cg.add(log.pre_setup())

    for tag, level in config[CONF_LOGS].items():
        cg.add(log.set_log_level(tag, LOG_LEVELS[level]))

    level = config[CONF_LEVEL]
    cg.add_define("USE_LOGGER")
    this_severity = LOG_LEVEL_SEVERITY.index(level)
    cg.add_build_flag("-DESPHOME_LOG_LEVEL={}".format(LOG_LEVELS[level]))

    verbose_severity = LOG_LEVEL_SEVERITY.index("VERBOSE")
    very_verbose_severity = LOG_LEVEL_SEVERITY.index("VERY_VERBOSE")
    is_at_least_verbose = this_severity >= verbose_severity
    is_at_least_very_verbose = this_severity >= very_verbose_severity
    has_serial_logging = baud_rate != 0

    if CORE.is_esp8266 and has_serial_logging and is_at_least_verbose:
        debug_serial_port = HARDWARE_UART_TO_SERIAL[config.get(CONF_HARDWARE_UART)]
        cg.add_build_flag(f"-DDEBUG_ESP_PORT={debug_serial_port}")
        cg.add_build_flag("-DLWIP_DEBUG")
        DEBUG_COMPONENTS = {
            "HTTP_CLIENT",
            "HTTP_SERVER",
            "HTTP_UPDATE",
            "OTA",
            "SSL",
            "TLS_MEM",
            "UPDATER",
            "WIFI",
            # Spams logs too much:
            # 'MDNS_RESPONDER',
        }
        for comp in DEBUG_COMPONENTS:
            cg.add_build_flag(f"-DDEBUG_ESP_{comp}")
    if CORE.is_esp32 and is_at_least_verbose:
        cg.add_build_flag("-DCORE_DEBUG_LEVEL=5")
    if CORE.is_esp32 and is_at_least_very_verbose:
        cg.add_build_flag("-DENABLE_I2C_DEBUG_BUFFER")
    if config.get(CONF_ESP8266_STORE_LOG_STRINGS_IN_FLASH):
        cg.add_build_flag("-DUSE_STORE_LOG_STR_IN_FLASH")

    # Register at end for safe mode
    await cg.register_component(log, config)

    for conf in config.get(CONF_ON_MESSAGE, []):
        trigger = cg.new_Pvariable(
            conf[CONF_TRIGGER_ID], log, LOG_LEVEL_SEVERITY.index(conf[CONF_LEVEL])
        )
        await automation.build_automation(
            trigger,
            [
                (cg.int_, "level"),
                (cg.const_char_ptr, "tag"),
                (cg.const_char_ptr, "message"),
            ],
            conf,
        )


def maybe_simple_message(schema):
    def validator(value):
        if isinstance(value, dict):
            return cv.Schema(schema)(value)
        return cv.Schema(schema)({CONF_FORMAT: value})

    return validator


def validate_printf(value):
    # https://stackoverflow.com/questions/30011379/how-can-i-parse-a-c-format-string-in-python
    cfmt = r"""
    (                                  # start of capture group 1
    %                                  # literal "%"
    (?:[-+0 #]{0,5})                   # optional flags
    (?:\d+|\*)?                        # width
    (?:\.(?:\d+|\*))?                  # precision
    (?:h|l|ll|w|I|I32|I64)?            # size
    [cCdiouxXeEfgGaAnpsSZ]             # type
    ) 
    """  # noqa
    matches = re.findall(cfmt, value[CONF_FORMAT], flags=re.X)
    if len(matches) != len(value[CONF_ARGS]):
        raise cv.Invalid(
            "Found {} printf-patterns ({}), but {} args were given!"
            "".format(len(matches), ", ".join(matches), len(value[CONF_ARGS]))
        )
    return value


CONF_LOGGER_LOG = "logger.log"
LOGGER_LOG_ACTION_SCHEMA = cv.All(
    maybe_simple_message(
        {
            cv.Required(CONF_FORMAT): cv.string,
            cv.Optional(CONF_ARGS, default=list): cv.ensure_list(cv.lambda_),
            cv.Optional(CONF_LEVEL, default="DEBUG"): cv.one_of(
                *LOG_LEVEL_TO_ESP_LOG, upper=True
            ),
            cv.Optional(CONF_TAG, default="main"): cv.string,
        }
    ),
    validate_printf,
)


@automation.register_action(CONF_LOGGER_LOG, LambdaAction, LOGGER_LOG_ACTION_SCHEMA)
async def logger_log_action_to_code(config, action_id, template_arg, args):
    esp_log = LOG_LEVEL_TO_ESP_LOG[config[CONF_LEVEL]]
    args_ = [cg.RawExpression(str(x)) for x in config[CONF_ARGS]]

    text = str(cg.statement(esp_log(config[CONF_TAG], config[CONF_FORMAT], *args_)))

    lambda_ = await cg.process_lambda(Lambda(text), args, return_type=cg.void)
    return cg.new_Pvariable(action_id, template_arg, lambda_)
