import importlib
import logging
import os
from pathlib import Path
import re

from esphome import loader
from esphome.config import iter_component_configs, iter_components
from esphome.const import (
    HEADER_FILE_EXTENSIONS,
    PLATFORM_ESP32,
    SOURCE_FILE_EXTENSIONS,
    __version__,
)
from esphome.core import CORE, EsphomeError
from esphome.helpers import (
    copy_file_if_changed,
    read_file,
    walk_files,
    write_file_if_changed,
)
from esphome.storage_json import StorageJSON, storage_path

_LOGGER = logging.getLogger(__name__)

CPP_AUTO_GENERATE_BEGIN = "// ========== AUTO GENERATED CODE BEGIN ==========="
CPP_AUTO_GENERATE_END = "// =========== AUTO GENERATED CODE END ============"
CPP_INCLUDE_BEGIN = "// ========== AUTO GENERATED INCLUDE BLOCK BEGIN ==========="
CPP_INCLUDE_END = "// ========== AUTO GENERATED INCLUDE BLOCK END ==========="

CPP_BASE_FORMAT = (
    """// Auto generated code by esphome
""",
    """"

void setup() {
  """,
    """
  App.setup();
}

void loop() {
  App.loop();
}
""",
)

UPLOAD_SPEED_OVERRIDE = {
    "esp210": 57600,
}


def get_flags(key):
    flags = set()
    for _, component, conf in iter_component_configs(CORE.config):
        flags |= getattr(component, key)(conf)
    return flags


def get_include_text():
    include_text = '#include "esphome.h"\nusing namespace esphome;\n'
    for _, component, conf in iter_component_configs(CORE.config):
        if not hasattr(component, "includes"):
            continue
        includes = component.includes
        if callable(includes):
            includes = includes(conf)
        if includes is None:
            continue
        if isinstance(includes, list):
            includes = "\n".join(includes)
        if not includes:
            continue
        include_text += f"{includes}\n"
    return include_text


def replace_file_content(text, pattern, repl):
    content_new, count = re.subn(pattern, repl, text, flags=re.M)
    return content_new, count


def storage_should_clean(old: StorageJSON, new: StorageJSON) -> bool:
    if old is None:
        return True

    if old.src_version != new.src_version:
        return True
    if old.build_path != new.build_path:
        return True

    return False


def storage_should_update_cmake_cache(old: StorageJSON, new: StorageJSON) -> bool:
    if (
        old.loaded_integrations != new.loaded_integrations
        or old.loaded_platforms != new.loaded_platforms
    ):
        if new.core_platform == PLATFORM_ESP32:
            from esphome.components.esp32 import FRAMEWORK_ESP_IDF

            return new.framework == FRAMEWORK_ESP_IDF
    return False


def update_storage_json():
    path = storage_path()
    old = StorageJSON.load(path)
    new = StorageJSON.from_esphome_core(CORE, old)
    if old == new:
        return

    if storage_should_clean(old, new):
        _LOGGER.info("Core config, version changed, cleaning build files...")
        clean_build()
    elif storage_should_update_cmake_cache(old, new):
        _LOGGER.info("Integrations changed, cleaning cmake cache...")
        clean_cmake_cache()

    new.save(path)


def find_begin_end(text, begin_s, end_s):
    begin_index = text.find(begin_s)
    if begin_index == -1:
        raise EsphomeError(
            "Could not find auto generated code begin in file, either "
            "delete the main sketch file or insert the comment again."
        )
    if text.find(begin_s, begin_index + 1) != -1:
        raise EsphomeError(
            "Found multiple auto generate code begins, don't know "
            "which to chose, please remove one of them."
        )
    end_index = text.find(end_s)
    if end_index == -1:
        raise EsphomeError(
            "Could not find auto generated code end in file, either "
            "delete the main sketch file or insert the comment again."
        )
    if text.find(end_s, end_index + 1) != -1:
        raise EsphomeError(
            "Found multiple auto generate code endings, don't know "
            "which to chose, please remove one of them."
        )

    return text[:begin_index], text[(end_index + len(end_s)) :]


DEFINES_H_FORMAT = ESPHOME_H_FORMAT = """\
#pragma once
#include "esphome/core/macros.h"
{}
"""
VERSION_H_FORMAT = """\
#pragma once
#include "esphome/core/macros.h"
#define ESPHOME_VERSION "{}"
#define ESPHOME_VERSION_CODE VERSION_CODE({}, {}, {})
"""
DEFINES_H_TARGET = "esphome/core/defines.h"
VERSION_H_TARGET = "esphome/core/version.h"
ESPHOME_README_TXT = """
THIS DIRECTORY IS AUTO-GENERATED, DO NOT MODIFY

ESPHome automatically populates the build directory, and any
changes to this directory will be removed the next time esphome is
run.

For modifying esphome's core files, please use a development esphome install,
the custom_components folder or the external_components feature.
"""


def copy_src_tree():
    source_files: list[loader.FileResource] = []
    for _, component in iter_components(CORE.config):
        source_files += component.resources
    source_files_map = {
        Path(x.package.replace(".", "/") + "/" + x.resource): x for x in source_files
    }

    # Convert to list and sort
    source_files_l = list(source_files_map.items())
    source_files_l.sort()

    # Build #include list for esphome.h
    include_l = []
    for target, _ in source_files_l:
        if target.suffix in HEADER_FILE_EXTENSIONS:
            include_l.append(f'#include "{target}"')
    include_l.append("")
    include_s = "\n".join(include_l)

    source_files_copy = source_files_map.copy()
    ignore_targets = [Path(x) for x in (DEFINES_H_TARGET, VERSION_H_TARGET)]
    for t in ignore_targets:
        source_files_copy.pop(t)

    for fname in walk_files(CORE.relative_src_path("esphome")):
        p = Path(fname)
        if p.suffix not in SOURCE_FILE_EXTENSIONS:
            # Not a source file, ignore
            continue
        # Transform path to target path name
        target = p.relative_to(CORE.relative_src_path())
        if target in ignore_targets:
            # Ignore defines.h, will be dealt with later
            continue
        if target not in source_files_copy:
            # Source file removed, delete target
            p.unlink()
        else:
            src_file = source_files_copy.pop(target)
            with src_file.path() as src_path:
                copy_file_if_changed(src_path, p)

    # Now copy new files
    for target, src_file in source_files_copy.items():
        dst_path = CORE.relative_src_path(*target.parts)
        with src_file.path() as src_path:
            copy_file_if_changed(src_path, dst_path)

    # Finally copy defines
    write_file_if_changed(
        CORE.relative_src_path("esphome", "core", "defines.h"), generate_defines_h()
    )
    write_file_if_changed(CORE.relative_build_path("README.txt"), ESPHOME_README_TXT)
    write_file_if_changed(
        CORE.relative_src_path("esphome.h"), ESPHOME_H_FORMAT.format(include_s)
    )
    write_file_if_changed(
        CORE.relative_src_path("esphome", "core", "version.h"), generate_version_h()
    )

    platform = "esphome.components." + CORE.target_platform
    try:
        module = importlib.import_module(platform)
        copy_files = getattr(module, "copy_files")
        copy_files()
    except AttributeError:
        pass


def generate_defines_h():
    define_content_l = [x.as_macro for x in CORE.defines]
    define_content_l.sort()
    return DEFINES_H_FORMAT.format("\n".join(define_content_l))


def generate_version_h():
    match = re.match(r"^(\d+)\.(\d+).(\d+)-?\w*$", __version__)
    if not match:
        raise EsphomeError(f"Could not parse version {__version__}.")
    return VERSION_H_FORMAT.format(
        __version__, match.group(1), match.group(2), match.group(3)
    )


def write_cpp(code_s):
    path = CORE.relative_src_path("main.cpp")
    if os.path.isfile(path):
        text = read_file(path)
        code_format = find_begin_end(
            text, CPP_AUTO_GENERATE_BEGIN, CPP_AUTO_GENERATE_END
        )
        code_format_ = find_begin_end(
            code_format[0], CPP_INCLUDE_BEGIN, CPP_INCLUDE_END
        )
        code_format = (code_format_[0], code_format_[1], code_format[1])
    else:
        code_format = CPP_BASE_FORMAT

    copy_src_tree()
    global_s = '#include "esphome.h"\n'
    global_s += CORE.cpp_global_section

    full_file = f"{code_format[0] + CPP_INCLUDE_BEGIN}\n{global_s}{CPP_INCLUDE_END}"
    full_file += (
        f"{code_format[1] + CPP_AUTO_GENERATE_BEGIN}\n{code_s}{CPP_AUTO_GENERATE_END}"
    )
    full_file += code_format[2]
    write_file_if_changed(path, full_file)


def clean_cmake_cache():
    pioenvs = CORE.relative_pioenvs_path()
    if os.path.isdir(pioenvs):
        pioenvs_cmake_path = CORE.relative_pioenvs_path(CORE.name, "CMakeCache.txt")
        if os.path.isfile(pioenvs_cmake_path):
            _LOGGER.info("Deleting %s", pioenvs_cmake_path)
            os.remove(pioenvs_cmake_path)


def clean_build():
    import shutil

    pioenvs = CORE.relative_pioenvs_path()
    if os.path.isdir(pioenvs):
        _LOGGER.info("Deleting %s", pioenvs)
        shutil.rmtree(pioenvs)
    piolibdeps = CORE.relative_piolibdeps_path()
    if os.path.isdir(piolibdeps):
        _LOGGER.info("Deleting %s", piolibdeps)
        shutil.rmtree(piolibdeps)


GITIGNORE_CONTENT = """# Gitignore settings for ESPHome
# This is an example and may include too much for your use-case.
# You can modify this file to suit your needs.
/.esphome/
/secrets.yaml
"""


def write_gitignore():
    path = CORE.relative_config_path(".gitignore")
    if not os.path.isfile(path):
        with open(file=path, mode="w", encoding="utf-8") as f:
            f.write(GITIGNORE_CONTENT)