from dataclasses import dataclass, field
from typing import List, Optional
from enum import Enum
import os


class FlipperManifestException(Exception):
    pass


class FlipperAppType(Enum):
    SERVICE = "Service"
    SYSTEM = "System"
    APP = "App"
    PLUGIN = "Plugin"
    DEBUG = "Debug"
    ARCHIVE = "Archive"
    SETTINGS = "Settings"
    STARTUP = "StartupHook"
    EXTERNAL = "External"
    METAPACKAGE = "Package"


@dataclass
class FlipperApplication:
    appid: str
    apptype: FlipperAppType
    name: Optional[str] = None
    entry_point: Optional[str] = None
    flags: List[str] = field(default_factory=lambda: ["Default"])
    cdefines: List[str] = field(default_factory=list)
    requires: List[str] = field(default_factory=list)
    conflicts: List[str] = field(default_factory=list)
    provides: List[str] = field(default_factory=list)
    stack_size: int = 2048
    icon: Optional[str] = None
    order: int = 0
    _appdir: Optional[str] = None


class AppManager:
    def __init__(self):
        self.known_apps = {}

    def get(self, appname: str):
        try:
            return self.known_apps[appname]
        except KeyError as _:
            raise FlipperManifestException(
                f"Missing application manifest for '{appname}'"
            )

    def load_manifest(self, app_manifest_path: str, app_dir_name: str):
        if not os.path.exists(app_manifest_path):
            raise FlipperManifestException(
                f"App manifest not found at path {app_manifest_path}"
            )
        # print("Loading", app_manifest_path)

        app_manifests = []

        def App(*args, **kw):
            nonlocal app_manifests
            app_manifests.append(FlipperApplication(*args, **kw, _appdir=app_dir_name))

        try:
            with open(app_manifest_path, "rt") as manifest_file:
                exec(manifest_file.read())
        except Exception as e:
            raise FlipperManifestException(
                f"Failed parsing manifest '{app_manifest_path}' : {e}"
            )

        if len(app_manifests) == 0:
            raise FlipperManifestException(
                f"App manifest '{app_manifest_path}' is malformed"
            )

        # print("Built", app_manifests)
        for app in app_manifests:
            self._add_known_app(app)

    def _add_known_app(self, app: FlipperApplication):
        if self.known_apps.get(app.appid, None):
            raise FlipperManifestException(f"Duplicate app declaration: {app.appid}")
        self.known_apps[app.appid] = app

    def filter_apps(self, applist: List[str]):
        return AppBuildset(self, applist)


class AppBuilderException(Exception):
    pass


class AppBuildset:
    BUILTIN_APP_TYPES = (
        FlipperAppType.SERVICE,
        FlipperAppType.SYSTEM,
        FlipperAppType.APP,
        FlipperAppType.PLUGIN,
        FlipperAppType.DEBUG,
        FlipperAppType.ARCHIVE,
        FlipperAppType.SETTINGS,
        FlipperAppType.STARTUP,
    )

    def __init__(self, appmgr: AppManager, appnames: List[str]):
        self.appmgr = appmgr
        self.appnames = set(appnames)
        self._orig_appnames = appnames
        self._process_deps()
        self._check_conflicts()
        self._check_unsatisfied()  # unneeded?
        self.apps = sorted(
            list(map(self.appmgr.get, self.appnames)),
            key=lambda app: app.appid,
        )

    def _is_missing_dep(self, dep_name: str):
        return dep_name not in self.appnames

    def _process_deps(self):
        while True:
            provided = []
            for app in self.appnames:
                # print(app)
                provided.extend(
                    filter(
                        self._is_missing_dep,
                        self.appmgr.get(app).provides + self.appmgr.get(app).requires,
                    )
                )
            # print("provides round", provided)
            if len(provided) == 0:
                break
            self.appnames.update(provided)

    def _check_conflicts(self):
        conflicts = []
        for app in self.appnames:
            # print(app)
            if conflict_app_name := list(
                filter(
                    lambda dep_name: dep_name in self.appnames,
                    self.appmgr.get(app).conflicts,
                )
            ):
                conflicts.append((app, conflict_app_name))

        if len(conflicts):
            raise AppBuilderException(
                f"App conflicts for {', '.join(f'{conflict_dep[0]}: {conflict_dep[1]}' for conflict_dep in conflicts)}"
            )

    def _check_unsatisfied(self):
        unsatisfied = []
        for app in self.appnames:
            if missing_dep := list(
                filter(self._is_missing_dep, self.appmgr.get(app).requires)
            ):
                unsatisfied.append((app, missing_dep))

        if len(unsatisfied):
            raise AppBuilderException(
                f"Unsatisfied dependencies for {', '.join(f'{missing_dep[0]}: {missing_dep[1]}' for missing_dep in unsatisfied)}"
            )

    def get_apps_cdefs(self):
        cdefs = set()
        for app in self.apps:
            cdefs.update(app.cdefines)
        return sorted(list(cdefs))

    def get_apps_of_type(self, apptype: FlipperAppType):
        return sorted(
            filter(lambda app: app.apptype == apptype, self.apps),
            key=lambda app: app.order,
        )

    def get_builtin_app_folders(self):
        return sorted(
            set(
                app._appdir
                for app in filter(
                    lambda app: app.apptype in self.BUILTIN_APP_TYPES, self.apps
                )
            )
        )


class ApplicationsCGenerator:
    APP_TYPE_MAP = {
        FlipperAppType.SERVICE: ("FlipperApplication", "FLIPPER_SERVICES"),
        FlipperAppType.SYSTEM: ("FlipperApplication", "FLIPPER_SYSTEM_APPS"),
        FlipperAppType.APP: ("FlipperApplication", "FLIPPER_APPS"),
        FlipperAppType.PLUGIN: ("FlipperApplication", "FLIPPER_PLUGINS"),
        FlipperAppType.DEBUG: ("FlipperApplication", "FLIPPER_DEBUG_APPS"),
        FlipperAppType.SETTINGS: ("FlipperApplication", "FLIPPER_SETTINGS_APPS"),
        FlipperAppType.STARTUP: ("FlipperOnStartHook", "FLIPPER_ON_SYSTEM_START"),
    }

    def __init__(self, buildset: AppBuildset):
        self.buildset = buildset

    def get_app_ep_forward(self, app: FlipperApplication):
        if app.apptype == FlipperAppType.STARTUP:
            return f"extern void {app.entry_point}();"
        return f"extern int32_t {app.entry_point}(void* p);"

    def get_app_descr(self, app: FlipperApplication):
        if app.apptype == FlipperAppType.STARTUP:
            return app.entry_point
        return f"""
    {{.app = {app.entry_point},
     .name = "{app.name}",
     .stack_size = {app.stack_size},
     .icon = {f"&{app.icon}" if app.icon else "NULL"},
     .flags = {'|'.join(f"FlipperApplicationFlag{flag}" for flag in app.flags)} }}"""

    def generate(self):
        contents = ['#include "applications.h"', "#include <assets_icons.h>"]
        for apptype in self.APP_TYPE_MAP:
            contents.extend(
                map(self.get_app_ep_forward, self.buildset.get_apps_of_type(apptype))
            )
            entry_type, entry_block = self.APP_TYPE_MAP[apptype]
            contents.append(f"const {entry_type} {entry_block}[] = {{")
            contents.append(
                ",\n".join(
                    map(self.get_app_descr, self.buildset.get_apps_of_type(apptype))
                )
            )
            contents.append("};")
            contents.append(
                f"const size_t {entry_block}_COUNT = COUNT_OF({entry_block});"
            )

        archive_app = self.buildset.get_apps_of_type(FlipperAppType.ARCHIVE)
        if archive_app:
            contents.extend(
                [
                    self.get_app_ep_forward(archive_app[0]),
                    f"const FlipperApplication FLIPPER_ARCHIVE = {self.get_app_descr(archive_app[0])};",
                ]
            )

        return "\n".join(contents)