use models::projects::{project, project_history_name, project_members};
use models::rooms::room;
use sea_orm::*;
use uuid::Uuid;

use super::RoomService;
use crate::error::RoomError;

impl RoomService {
    pub(crate) fn validate_name(name: &str, max_len: usize) -> Result<(), RoomError> {
        if name.trim().is_empty() {
            return Err(RoomError::BadRequest("name cannot be empty".to_string()));
        }
        if name.len() > max_len {
            return Err(RoomError::BadRequest(format!(
                "name exceeds maximum length of {} characters",
                max_len
            )));
        }
        Ok(())
    }

    pub(crate) fn validate_content(content: &str, max_len: usize) -> Result<(), RoomError> {
        if content.trim().is_empty() {
            return Err(RoomError::BadRequest("content cannot be empty".to_string()));
        }
        if content.len() > max_len {
            return Err(RoomError::BadRequest(format!(
                "content exceeds maximum length of {} characters",
                max_len
            )));
        }
        Ok(())
    }

    pub(crate) fn sanitize_content(content: &str) -> String {
        ammonia::clean(content)
    }

    pub(crate) fn parse_message_content_type(
        content_type: Option<String>,
    ) -> Result<models::rooms::MessageContentType, RoomError> {
        match content_type.unwrap_or_else(|| "text".to_string()).to_lowercase().as_str() {
            "text" => Ok(models::rooms::MessageContentType::Text),
            "image" => Ok(models::rooms::MessageContentType::Image),
            "audio" => Ok(models::rooms::MessageContentType::Audio),
            "video" => Ok(models::rooms::MessageContentType::Video),
            "file" => Ok(models::rooms::MessageContentType::File),
            _ => Err(RoomError::BadRequest("invalid message content_type".to_string())),
        }
    }

    pub async fn utils_find_project_by_name(&self, name: String) -> Result<project::Model, RoomError> {
        match project::Entity::find()
            .filter(project::Column::Name.eq(name.clone()))
            .one(&self.db)
            .await
            .inspect_err(|e| tracing::warn!(error = %e, project_name = %name, "utils_find_project_by_name: DB error"))
            .ok()
            .flatten()
        {
            Some(project) => Ok(project),
            None => match project_history_name::Entity::find()
                .filter(project_history_name::Column::HistoryName.eq(name.clone()))
                .one(&self.db)
                .await
                .inspect_err(|e| tracing::warn!(error = %e, name = %name, "project_history_name lookup failed"))
                .ok()
                .flatten()
            {
                Some(project) => self.utils_find_project_by_uid(project.project_uid).await,
                None => Err(RoomError::NotFound("Project not found".to_string())),
            },
        }
    }

    pub async fn utils_find_project_by_uid(&self, uid: Uuid) -> Result<project::Model, RoomError> {
        project::Entity::find_by_id(uid)
            .one(&self.db)
            .await
            .inspect_err(|e| tracing::warn!(error = %e, project_uid = %uid, "utils_find_project_by_uid: DB error"))
            .ok()
            .flatten()
            .ok_or_else(|| RoomError::NotFound("Project not found".to_string()))
    }

    pub async fn check_project_access(&self, project_uid: Uuid, user_uid: Uuid) -> Result<(), RoomError> {
        let project = project::Entity::find_by_id(project_uid)
            .one(&self.db)
            .await
            .inspect_err(|e| tracing::warn!(error = %e, project_uid = %project_uid, "check_project_access: DB error"))
            .ok()
            .flatten()
            .ok_or_else(|| RoomError::NotFound("Project not found".to_string()))?;

        if project.is_public {
            return Ok(());
        }

        let member = project_members::Entity::find()
            .filter(project_members::Column::Project.eq(project_uid))
            .filter(project_members::Column::User.eq(user_uid))
            .one(&self.db)
            .await?;

        if member.is_some() { Ok(()) } else { Err(RoomError::NoPower) }
    }

    pub async fn ensure_room_visible_for_user(
        &self, room: &room::Model, user_id: Uuid,
    ) -> Result<(), RoomError> {
        self.require_room_access(room.id, user_id).await
    }

    pub async fn get_room_version(&self, room_id: Uuid) -> Result<i64, RoomError> {
        let version_key = format!("room:version:{}", room_id);
        let mut conn = self.cache.conn().await.map_err(|e| {
            RoomError::Internal(format!("failed to get redis for version: {}", e))
        })?;
        let version: Option<i64> = redis::cmd("GET")
            .arg(&version_key)
            .query_async(&mut conn)
            .await
            .map_err(|e| RoomError::Internal(format!("version GET: {}", e)))?;
        Ok(version.unwrap_or(0))
    }

    pub async fn increment_room_version(&self, room_id: Uuid) -> Result<i64, RoomError> {
        Self::raw_increment_room_version(&self.cache, room_id).await
    }

    pub async fn raw_increment_room_version(
        cache: &db::cache::AppCache, room_id: Uuid,
    ) -> Result<i64, RoomError> {
        let version_key = format!("room:version:{}", room_id);
        let mut conn = cache.conn().await.map_err(|e| {
            RoomError::Internal(format!("failed to get redis for version: {}", e))
        })?;
        let version: i64 = redis::cmd("INCR")
            .arg(&version_key)
            .query_async(&mut conn)
            .await
            .map_err(|e| RoomError::Internal(format!("version INCR: {}", e)))?;
        Ok(version)
    }
}