use uuid::Uuid;

use crate::error::AppError;
use crate::models::common::Role;
use crate::models::prs::PrReviewRequest;
use crate::service::PrService;
use crate::session::Session;

impl PrService {
    pub async fn pr_requested_reviewers(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
    ) -> Result<Vec<PrReviewRequest>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        self.ensure_repo_readable(user_uid, &repo).await?;
        let pr = self.resolve_pr(wk_name, repo_name, number).await?;
        self.ensure_pr_readable(user_uid, &pr).await?;
        sqlx::query_as::<_, PrReviewRequest>(
            "SELECT * FROM pr_review_request WHERE pull_request_id = $1 ORDER BY created_at ASC",
        )
        .bind(pr.id)
        .fetch_all(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }

    pub async fn pr_request_reviewers(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
        reviewer_ids: Vec<Uuid>,
    ) -> Result<Vec<PrReviewRequest>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        self.ensure_repo_role_at_least(user_uid, &repo, Role::Member)
            .await?;
        let pr = self.resolve_pr(wk_name, repo_name, number).await?;
        self.ensure_pr_editable(user_uid, &pr).await?;

        let mut created = Vec::new();
        for reviewer_id in reviewer_ids {
            let result = sqlx::query_as::<_, PrReviewRequest>(
                "INSERT INTO pr_review_request (id, pull_request_id, reviewer_id, requested_by, created_at) \
                 VALUES ($1, $2, $3, $4, NOW()) ON CONFLICT (pull_request_id, reviewer_id) DO NOTHING RETURNING *",
            )
            .bind(Uuid::now_v7())
            .bind(pr.id)
            .bind(reviewer_id)
            .bind(user_uid)
            .fetch_optional(self.ctx.db.writer())
            .await
            .map_err(AppError::Database)?;
            if let Some(r) = result {
                created.push(r);
            }
        }
        Ok(created)
    }

    pub async fn pr_remove_requested_reviewer(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
        reviewer_id: Uuid,
    ) -> Result<(), AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        self.ensure_repo_role_at_least(user_uid, &repo, Role::Member)
            .await?;
        let pr = self.resolve_pr(wk_name, repo_name, number).await?;
        self.ensure_pr_editable(user_uid, &pr).await?;
        sqlx::query(
            "DELETE FROM pr_review_request WHERE pull_request_id = $1 AND reviewer_id = $2",
        )
        .bind(pr.id)
        .bind(reviewer_id)
        .execute(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)?;
        Ok(())
    }
}