use crate::error::AppError;
use crate::models::common::{DeliveryChannel, NotificationType, TargetType};
use crate::models::notifications::NotificationBlock;
use crate::service::NotificationService;
use crate::session::Session;
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

use super::util::clamp_limit_offset;

#[derive(Debug, Deserialize, Serialize)]
pub struct CreateBlockParams {
    pub workspace_id: Option<Uuid>,
    pub repo_id: Option<Uuid>,
    pub target_type: TargetType,
    pub target_id: Option<Uuid>,
    pub notification_type: Option<NotificationType>,
    pub channel: Option<DeliveryChannel>,
    pub reason: Option<String>,
    pub expires_at: Option<DateTime<Utc>>,
}

impl NotificationBlock {
    pub async fn find_by_id(
        pool: &sqlx::PgPool,
        id: Uuid,
        user_id: Uuid,
    ) -> Result<Option<Self>, AppError> {
        sqlx::query_as::<_, NotificationBlock>(
            "SELECT id, user_id, workspace_id, repo_id, target_type, target_id, notification_type, \
             channel, reason, expires_at, created_at, updated_at \
             FROM notification_block WHERE id = $1 AND user_id = $2",
        )
        .bind(id)
        .bind(user_id)
        .fetch_optional(pool)
        .await
        .map_err(AppError::Database)
    }

    pub async fn list_for_user(
        pool: &sqlx::PgPool,
        user_id: Uuid,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<Self>, AppError> {
        sqlx::query_as::<_, NotificationBlock>(
            "SELECT id, user_id, workspace_id, repo_id, target_type, target_id, notification_type, \
             channel, reason, expires_at, created_at, updated_at \
             FROM notification_block WHERE user_id = $1 \
             ORDER BY created_at DESC LIMIT $2 OFFSET $3",
        )
        .bind(user_id)
        .bind(limit)
        .bind(offset)
        .fetch_all(pool)
        .await
        .map_err(AppError::Database)
    }
}

impl NotificationService {
    pub async fn list_blocks(
        &self,
        session: &Session,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<NotificationBlock>, AppError> {
        let user_id = session.user().ok_or(AppError::Unauthorized)?;
        let (limit, offset) = clamp_limit_offset(limit, offset);
        NotificationBlock::list_for_user(self.ctx.db.reader(), user_id, limit, offset).await
    }

    pub async fn create_block(
        &self,
        session: &Session,
        params: CreateBlockParams,
    ) -> Result<NotificationBlock, AppError> {
        let user_id = session.user().ok_or(AppError::Unauthorized)?;
        let id = Uuid::now_v7();
        let now = Utc::now();

        sqlx::query(
            "INSERT INTO notification_block \
             (id, user_id, workspace_id, repo_id, target_type, target_id, notification_type, channel, reason, expires_at, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $11)",
        )
        .bind(id)
        .bind(user_id)
        .bind(params.workspace_id)
        .bind(params.repo_id)
        .bind(params.target_type.as_str())
        .bind(params.target_id)
        .bind(params.notification_type.map(|t| t.as_str()))
        .bind(params.channel.map(|c| c.as_str()))
        .bind(params.reason)
        .bind(params.expires_at)
        .bind(now)
        .execute(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)?;

        NotificationBlock::find_by_id(self.ctx.db.reader(), id, user_id)
            .await?
            .ok_or(AppError::InternalServerError(
                "failed to fetch created block".into(),
            ))
    }

    pub async fn delete_block(&self, session: &Session, block_id: Uuid) -> Result<(), AppError> {
        let user_id = session.user().ok_or(AppError::Unauthorized)?;

        let result = sqlx::query("DELETE FROM notification_block WHERE id = $1 AND user_id = $2")
            .bind(block_id)
            .bind(user_id)
            .execute(self.ctx.db.writer())
            .await
            .map_err(AppError::Database)?;

        if result.rows_affected() == 0 {
            return Err(AppError::NotFound("block not found".into()));
        }

        Ok(())
    }
}