use actix_web::{HttpResponse, web};
use serde::Deserialize;
use utoipa::IntoParams;

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::prs::PrSubscription;
use crate::service::AppService;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct PrPath {
    /// Workspace name (unique identifier)
    pub workspace_name: String,
    /// Repository name (unique within the workspace)
    pub repo_name: String,
    /// PR number (unique within the repository)
    pub number: i64,
}

#[derive(Debug, Deserialize, IntoParams)]
pub struct QP {
    pub limit: Option<i64>,
    pub offset: Option<i64>,
}

/// List subscriptions on a PR
#[utoipa::path(
    get,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/subscriptions",
    tag = "Pull Requests",
    operation_id = "prListSubscriptions",
    params(PrPath, QP),
    responses(
        (status = 200, description = "Subscriptions listed.", body = ApiResponse<Vec<PrSubscription>>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 404, description = "PR not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn list_subscriptions(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PrPath>,
    query: web::Query<QP>,
) -> Result<HttpResponse, AppError> {
    let subs = service
        .pr
        .pr_subscriptions(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.number,
            query.limit.unwrap_or(50),
            query.offset.unwrap_or(0),
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(subs)))
}

/// Subscribe to a PR to receive notifications
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/subscribe",
    tag = "Pull Requests",
    operation_id = "prSubscribe",
    params(PrPath),
    responses(
        (status = 200, description = "Subscribed.", body = ApiResponse<PrSubscription>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 404, description = "PR not found", body = ApiErrorResponse),
        (status = 409, description = "Already subscribed", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn subscribe(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PrPath>,
) -> Result<HttpResponse, AppError> {
    let sub = service
        .pr
        .pr_subscribe(&session, &path.workspace_name, &path.repo_name, path.number)
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(sub)))
}

/// Unsubscribe from a PR
#[utoipa::path(
    delete,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/subscribe",
    tag = "Pull Requests",
    operation_id = "prUnsubscribe",
    params(PrPath),
    responses(
        (status = 200, description = "Unsubscribed.", body = ApiResponse<String>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 404, description = "Not subscribed", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn unsubscribe(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PrPath>,
) -> Result<HttpResponse, AppError> {
    service
        .pr
        .pr_unsubscribe(&session, &path.workspace_name, &path.repo_name, path.number)
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new("Unsubscribed".to_string())))
}

#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct MutePrParams {
    /// Whether to mute (true) or unmute (false) notifications
    pub muted: bool,
}

/// Mute or unmute notifications for a PR
#[utoipa::path(
    put,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/mute",
    tag = "Pull Requests",
    operation_id = "prMute",
    params(PrPath),
    request_body(content = MutePrParams, description = "Mute/unmute parameters", content_type = "application/json"),
    responses(
        (status = 200, description = "Mute status updated.", body = ApiResponse<String>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 404, description = "Not subscribed", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn mute(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PrPath>,
    params: web::Json<MutePrParams>,
) -> Result<HttpResponse, AppError> {
    service
        .pr
        .pr_mute(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.number,
            params.muted,
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new("Mute status updated".to_string())))
}