use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::error::AppError;
use crate::models::common::{EventType, JsonValue};
use crate::models::prs::PrEvent;
use crate::service::PrService;
use crate::session::Session;

use super::util::clamp_limit_offset;

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct CreatePrEventParams {
    pub event_type: String,
    pub old_value: Option<JsonValue>,
    pub new_value: Option<JsonValue>,
    pub metadata: Option<JsonValue>,
}

impl PrService {
    pub async fn pr_list_events(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<PrEvent>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let pr = self.resolve_pr(wk_name, repo_name, number).await?;
        self.ensure_pr_readable(user_uid, &pr).await?;
        let (limit, offset) = clamp_limit_offset(limit, offset);

        sqlx::query_as::<_, PrEvent>(
            "SELECT id, pull_request_id, actor_id, event_type, old_value, new_value, metadata, created_at \
             FROM pr_event WHERE pull_request_id = $1 ORDER BY created_at ASC LIMIT $2 OFFSET $3",
        )
        .bind(pr.id)
        .bind(limit)
        .bind(offset)
        .fetch_all(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }

    pub(crate) async fn create_pr_event(
        &self,
        pull_request_id: Uuid,
        actor_id: Option<Uuid>,
        event_type: EventType,
        old_value: Option<JsonValue>,
        new_value: Option<JsonValue>,
        metadata: Option<JsonValue>,
    ) -> Result<PrEvent, AppError> {
        sqlx::query_as::<_, PrEvent>(
            "INSERT INTO pr_event (id, pull_request_id, actor_id, event_type, old_value, new_value, metadata, created_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8) \
             RETURNING id, pull_request_id, actor_id, event_type, old_value, new_value, metadata, created_at",
        )
        .bind(Uuid::now_v7())
        .bind(pull_request_id)
        .bind(actor_id)
        .bind(event_type)
        .bind(old_value)
        .bind(new_value)
        .bind(metadata)
        .bind(chrono::Utc::now())
        .fetch_one(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)
    }
}