// Copyright (C) 2025-2026 Emilis Bliūdžius
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
use serde::{Deserialize, Serialize};
use thiserror::Error;

use crate::{
    game::{GameId, GameTime},
    message::PublicIdentity,
    player::PlayerId,
    role::RoleTitle,
};
use leptos::prelude::ServerFnErrorErr;

#[derive(Debug, Clone, PartialEq, Error, Serialize, Deserialize)]
pub enum GameError {
    #[error("too many roles. there's {players} players, but {roles} roles")]
    TooManyRoles { players: u8, roles: u8 },
    #[error("no wolves?")]
    NoWolves,
    #[error("message invalid for game state")]
    InvalidMessageForGameState,
    #[error("no executions during night time")]
    NoExecutionsAtNight,
    #[error("chracter is already dead")]
    CharacterAlreadyDead,
    #[error("no matching character found")]
    NoMatchingCharacterFound,
    #[error("character not in joined player pool")]
    CharacterNotInJoinedPlayers,
    #[error("{0}")]
    GenericError(String),
    #[error("invalid cause of death")]
    InvalidCauseOfDeath,
    #[error("invalid target")]
    InvalidTarget,
    #[error("timed out")]
    TimedOut,
    #[error("host channel closed")]
    HostChannelClosed,
    #[error("too many players: there's {got} players but only {need} roles")]
    TooManyPlayers { got: u8, need: u8 },
    #[error("it's already daytime")]
    AlreadyDaytime,
    #[error("it's not the end of the night yet")]
    NotEndOfNight,
    #[error("it's not day yet")]
    NotDayYet,
    #[error("it's not night")]
    NotNight,
    #[error("invalid role, expected {expected:?} got {got:?}")]
    InvalidRole { expected: RoleTitle, got: RoleTitle },
    #[error("no mentor for an apprentice to be an apprentice to :(")]
    NoApprenticeMentor,
    #[error("{0} isn't a mentor role")]
    NotAMentor(RoleTitle),
    #[error("inactive game object")]
    InactiveGameObject,
    #[error("socket error: {0}")]
    SocketError(String),
    #[error("this night is over")]
    NightOver,
    #[error("no night actions")]
    NoNightActions,
    #[error("still awaiting response")]
    AwaitingResponse,
    #[error("current state already has a response")]
    NightNeedsNext,
    #[error("night zero actions can only be obtained on night zero")]
    NotNightZero,
    #[error("this action cannot happen on night zero")]
    CannotHappenOnNightZero,
    #[error("wolves intro in progress")]
    WolvesIntroInProgress,
    #[error("a game is still ongoing")]
    GameOngoing,
    #[error("needs a role reveal")]
    NeedRoleReveal,
    #[error("no previous state")]
    NoPreviousState,
    #[error("invalid original kill for guardian guard")]
    GuardianInvalidOriginalKill,
    #[error("player not assigned number: {0}")]
    PlayerNotAssignedNumber(String),
    #[error("player [{0}] has an assigned role slot, but isn't in the player list")]
    AssignedPlayerMissing(PlayerId),
    #[error(" {0} assigned to {1} roles")]
    AssignedMultipleTimes(PublicIdentity, usize),
    #[error("change set for {0} is already set")]
    ChangesAlreadySet(GameTime),
    #[error("missing {0} in game story")]
    MissingTime(GameTime),
    #[error("no previous during day")]
    NoPreviousDuringDay,
    #[error("militia already spent")]
    MilitiaSpent,
    #[error("this prompt doesn't mark anyone")]
    PromptDoesntMark,
    #[error("cannot shapeshift on a non-shapeshifter prompt")]
    ShapeshiftingIsForShapeshifters,
    #[error("must select a target")]
    MustSelectTarget,
    #[error("no current prompt in aura handling")]
    NoCurrentPromptForAura,
    #[error("you're not dead")]
    NotDead,
    #[error("invalid character id assignment for player ID {for_player}")]
    InvalidCharacterIdAssignment { for_player: PlayerId },
    #[error("already joined")]
    AlreadyJoined,
    #[error("cannot join own game")]
    CannotJoinOwnGame,
    #[error("cannot leave a started game")]
    CannotLeaveOnceStarted,
    #[error("cannot join a started game")]
    CannotJoinStartedGame,
    #[error("game already started")]
    GameAlreadyStarted,
    #[error("you're already in another game: {0}")]
    AlreadyInAnotherGame(GameId),
}

#[derive(Debug, Clone, PartialEq, Error, Serialize, Deserialize)]
pub enum ServerError {
    #[error("internal server error")]
    InternalServerError,
    #[error("not found")]
    NotFound,
    #[error("user already exists")]
    UserAlreadyExists,
    #[error("invalid credentials")]
    InvalidCredentials,
    #[error("token expired")]
    ExpiredToken,
    #[error("connection error")]
    ConnectionError,
    #[error("invalid request: {0}")]
    InvalidRequest(String),
    #[error("you're already in an active game: {0}")]
    AlreadyInActiveGame(GameId),
    #[error("{0}")]
    GameError(#[from] GameError),
}

impl leptos::prelude::FromServerFnError for ServerError {
    type Encoder = leptos::server_fn::codec::JsonEncoding;

    fn from_server_fn_error(value: ServerFnErrorErr) -> Self {
        match value {
            ServerFnErrorErr::ServerError(err) => {
                log::error!("server error: {err}; truncating to ServerError::InternalServerError");
                ServerError::InternalServerError
            }
            ServerFnErrorErr::MiddlewareError(err) => {
                log::error!(
                    "middleware error: {err}; truncating to ServerError::InternalServerError"
                );
                ServerError::InternalServerError
            }
            ServerFnErrorErr::Request(err) => {
                const CONN_ERR: &str = "TypeError: NetworkError when attempting to fetch resource.";
                if err == CONN_ERR {
                    Self::ConnectionError
                } else {
                    Self::InvalidRequest(err)
                }
            }
            err => {
                let t = match &err {
                    ServerFnErrorErr::Registration(_) => "Registration",
                    ServerFnErrorErr::UnsupportedRequestMethod(_) => "UnsupportedRequestMethod",
                    ServerFnErrorErr::Request(_) => "Request",
                    ServerFnErrorErr::ServerError(_) => "ServerError",
                    ServerFnErrorErr::MiddlewareError(_) => "MiddlewareError",
                    ServerFnErrorErr::Deserialization(_) => "Deserialization",
                    ServerFnErrorErr::Serialization(_) => "Serialization",
                    ServerFnErrorErr::Args(_) => "Args",
                    ServerFnErrorErr::MissingArg(_) => "MissingArg",
                    ServerFnErrorErr::Response(_) => "Response",
                };
                Self::InvalidRequest(format!("[{t}]: {err}"))
            }
        }
    }
}

impl From<DatabaseError> for ServerError {
    fn from(err: DatabaseError) -> Self {
        match err {
            DatabaseError::NotFound => ServerError::NotFound,
            DatabaseError::UserAlreadyExists => ServerError::UserAlreadyExists,
            #[allow(unreachable_patterns)]
            _ => {
                log::error!(
                    "converting database error into ServerError::InternalServerError: {err}"
                );
                ServerError::InternalServerError
            }
        }
    }
}

#[derive(Debug, Clone, PartialEq, Error)]
pub enum DatabaseError {
    #[error("user already exists")]
    UserAlreadyExists,
    #[error("password hashing error: {0}")]
    PasswordHashError(String),
    #[error("sqlx error: {0}")]
    SqlxError(String),
    #[error("not found")]
    NotFound,
    #[error("(de)serialization error: {0}")]
    Serialization(String),
}

impl From<leptos::serde_json::Error> for DatabaseError {
    fn from(value: leptos::serde_json::Error) -> Self {
        Self::Serialization(value.to_string())
    }
}

#[cfg(feature = "ssr")]
impl axum::response::IntoResponse for ServerError {
    fn into_response(self) -> axum::response::Response {
        use axum::{Json, http::StatusCode};

        

        (
            match self {
                ServerError::AlreadyInActiveGame(_)
                | ServerError::GameError(_)
                | ServerError::InvalidCredentials
                | ServerError::InvalidRequest(_)
                | ServerError::UserAlreadyExists => StatusCode::BAD_REQUEST,
                ServerError::NotFound => StatusCode::NOT_FOUND,
                ServerError::ConnectionError | ServerError::InternalServerError => {
                    StatusCode::INTERNAL_SERVER_ERROR
                }
                ServerError::ExpiredToken => StatusCode::UNAUTHORIZED,
            },
            Json(self),
        )
            .into_response()
    }
}

#[cfg(feature = "ssr")]
impl From<sqlx::Error> for DatabaseError {
    fn from(err: sqlx::Error) -> Self {
        match err {
            sqlx::Error::RowNotFound => Self::NotFound,
            _ => Self::SqlxError(err.to_string()),
        }
    }
}

#[cfg(feature = "ssr")]
impl From<argon2::password_hash::Error> for DatabaseError {
    fn from(err: argon2::password_hash::Error) -> Self {
        Self::PasswordHashError(err.to_string())
    }
}