use uuid::Uuid;

use crate::error::AppError;
use crate::models::common::{Role, Status};
use crate::models::prs::PrCheckRun;
use crate::service::PrService;
use crate::session::Session;

use super::util::{clamp_limit_offset, ensure_affected, required_text};

#[derive(serde::Deserialize, serde::Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct CreateCheckRunParams {
    pub commit_sha: String,
    pub name: String,
    pub status: String,
    pub conclusion: Option<String>,
    pub details_url: Option<String>,
    pub external_id: Option<String>,
}

#[derive(serde::Deserialize, serde::Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct UpdateCheckRunParams {
    pub status: Option<String>,
    pub conclusion: Option<String>,
    pub details_url: Option<String>,
}

impl PrService {
    pub async fn pr_check_runs(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<PrCheckRun>, 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::<_, PrCheckRun>(
            "SELECT id, pull_request_id, commit_sha, name, status, conclusion, details_url, \
             external_id, started_at, completed_at, created_at, updated_at \
             FROM pr_check_run WHERE pull_request_id = $1 ORDER BY created_at DESC LIMIT $2 OFFSET $3",
        )
        .bind(pr.id).bind(limit).bind(offset)
        .fetch_all(self.ctx.db.reader()).await.map_err(AppError::Database)
    }

    pub async fn pr_create_check_run(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
        params: CreateCheckRunParams,
    ) -> Result<PrCheckRun, 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?;

        let name = required_text(params.name, "name")?;
        let status = params
            .status
            .trim()
            .parse::<Status>()
            .map_err(|_| AppError::BadRequest("invalid status".into()))?;
        if status == Status::Unknown {
            return Err(AppError::BadRequest("invalid status".into()));
        }
        let conclusion = params
            .conclusion
            .as_deref()
            .and_then(|s| s.parse::<Status>().ok())
            .filter(|s| *s != Status::Unknown);

        let now = chrono::Utc::now();
        sqlx::query_as::<_, PrCheckRun>(
            "INSERT INTO pr_check_run (id, pull_request_id, commit_sha, name, status, conclusion, \
             details_url, external_id, started_at, completed_at, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $11) \
             RETURNING id, pull_request_id, commit_sha, name, status, conclusion, details_url, \
             external_id, started_at, completed_at, created_at, updated_at",
        )
        .bind(Uuid::now_v7())
        .bind(pr.id)
        .bind(&params.commit_sha)
        .bind(&name)
        .bind(status)
        .bind(conclusion)
        .bind(params.details_url.as_deref())
        .bind(params.external_id.as_deref())
        .bind(if status == Status::Running {
            Some(now)
        } else {
            None
        })
        .bind(
            if matches!(status, Status::Completed | Status::Success | Status::Failed) {
                Some(now)
            } else {
                None
            },
        )
        .bind(now)
        .fetch_one(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)
    }

    pub async fn pr_update_check_run(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
        check_run_id: Uuid,
        params: UpdateCheckRunParams,
    ) -> Result<PrCheckRun, 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?;

        let current = sqlx::query_as::<_, PrCheckRun>(
            "SELECT id, pull_request_id, commit_sha, name, status, conclusion, details_url, \
             external_id, started_at, completed_at, created_at, updated_at \
             FROM pr_check_run WHERE id = $1 AND pull_request_id = $2",
        )
        .bind(check_run_id)
        .bind(pr.id)
        .fetch_optional(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)?
        .ok_or(AppError::NotFound("check run not found".into()))?;

        let status = match params.status {
            Some(ref v) => v
                .trim()
                .parse::<Status>()
                .map_err(|_| AppError::BadRequest("invalid status".into()))?,
            None => current.status,
        };
        let conclusion = params
            .conclusion
            .as_deref()
            .and_then(|s| s.parse::<Status>().ok())
            .filter(|s| *s != Status::Unknown)
            .or(current.conclusion);
        let details_url = params.details_url.or(current.details_url);
        let now = chrono::Utc::now();

        sqlx::query_as::<_, PrCheckRun>(
            "UPDATE pr_check_run SET status = $1, conclusion = $2, details_url = $3, updated_at = $4 \
             WHERE id = $5 \
             RETURNING id, pull_request_id, commit_sha, name, status, conclusion, details_url, \
             external_id, started_at, completed_at, created_at, updated_at",
        )
        .bind(status).bind(conclusion).bind(details_url.as_deref()).bind(now).bind(check_run_id)
        .fetch_one(self.ctx.db.writer()).await.map_err(AppError::Database)
    }

    pub async fn pr_delete_check_run(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        number: i64,
        check_run_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::Admin)
            .await?;
        let pr = self.resolve_pr(wk_name, repo_name, number).await?;

        let result = sqlx::query("DELETE FROM pr_check_run WHERE id = $1 AND pull_request_id = $2")
            .bind(check_run_id)
            .bind(pr.id)
            .execute(self.ctx.db.writer())
            .await
            .map_err(AppError::Database)?;
        ensure_affected(result.rows_affected(), "check run not found")
    }
}