use serde::{Deserialize, Serialize};

use crate::error::AppError;
use crate::models::common::DigestFrequency;
use crate::models::users::UserNotifySetting;
use crate::service::UserService;
use crate::session::Session;

use super::util::parse_enum;

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct UpdateUserNotifySettingParams {
    pub email_notifications: Option<bool>,
    pub web_notifications: Option<bool>,
    pub mention_notifications: Option<bool>,
    pub review_notifications: Option<bool>,
    pub security_notifications: Option<bool>,
    pub marketing_emails: Option<bool>,
    pub digest_frequency: Option<String>,
}

impl UserService {
    pub async fn user_notify_setting(&self, ctx: &Session) -> Result<UserNotifySetting, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        self.ensure_user_notify_setting(user_uid).await
    }

    pub async fn user_update_notify_setting(
        &self,
        ctx: &Session,
        params: UpdateUserNotifySettingParams,
    ) -> Result<UserNotifySetting, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let current = self.ensure_user_notify_setting(user_uid).await?;
        let digest_frequency = parse_enum(
            params.digest_frequency,
            current.digest_frequency,
            DigestFrequency::Unknown,
            "digest_frequency",
        )?;

        sqlx::query_as::<_, UserNotifySetting>(
            "UPDATE user_notify_setting SET email_notifications = $1, web_notifications = $2, \
             mention_notifications = $3, review_notifications = $4, security_notifications = $5, \
             marketing_emails = $6, digest_frequency = $7, updated_at = $8 WHERE user_id = $9 \
             RETURNING user_id, email_notifications, web_notifications, mention_notifications, \
             review_notifications, security_notifications, marketing_emails, digest_frequency, \
             created_at, updated_at",
        )
        .bind(
            params
                .email_notifications
                .unwrap_or(current.email_notifications),
        )
        .bind(
            params
                .web_notifications
                .unwrap_or(current.web_notifications),
        )
        .bind(
            params
                .mention_notifications
                .unwrap_or(current.mention_notifications),
        )
        .bind(
            params
                .review_notifications
                .unwrap_or(current.review_notifications),
        )
        .bind(
            params
                .security_notifications
                .unwrap_or(current.security_notifications),
        )
        .bind(params.marketing_emails.unwrap_or(current.marketing_emails))
        .bind(digest_frequency)
        .bind(chrono::Utc::now())
        .bind(user_uid)
        .fetch_one(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)
    }

    async fn ensure_user_notify_setting(
        &self,
        user_uid: uuid::Uuid,
    ) -> Result<UserNotifySetting, AppError> {
        if let Some(setting) = self.find_user_notify_setting(user_uid).await? {
            return Ok(setting);
        }
        let now = chrono::Utc::now();
        sqlx::query(
            "INSERT INTO user_notify_setting (user_id, email_notifications, web_notifications, \
             mention_notifications, review_notifications, security_notifications, marketing_emails, \
             digest_frequency, created_at, updated_at) \
             VALUES ($1, true, true, true, true, true, false, 'realtime', $2, $2) ON CONFLICT (user_id) DO NOTHING",
        )
        .bind(user_uid)
        .bind(now)
        .execute(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)?;
        self.find_user_notify_setting(user_uid)
            .await?
            .ok_or(AppError::UserNotFound)
    }

    async fn find_user_notify_setting(
        &self,
        user_uid: uuid::Uuid,
    ) -> Result<Option<UserNotifySetting>, AppError> {
        sqlx::query_as::<_, UserNotifySetting>(
            "SELECT user_id, email_notifications, web_notifications, mention_notifications, \
             review_notifications, security_notifications, marketing_emails, digest_frequency, \
             created_at, updated_at FROM user_notify_setting WHERE user_id = $1",
        )
        .bind(user_uid)
        .fetch_optional(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }
}