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::PrReaction;
use crate::service::AppService;
use crate::service::pr::reactions::CreateReactionParams;
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 ReactionPath {
    /// 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,
    /// Reaction ID (UUID)
    pub reaction_id: uuid::Uuid,
}

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

/// List reactions on a PR
#[utoipa::path(
    get,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/reactions",
    tag = "Pull Requests",
    operation_id = "prListReactions",
    params(PrPath, QP),
    responses(
        (status = 200, description = "Reactions listed.", body = ApiResponse<Vec<PrReaction>>),
        (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_reactions(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PrPath>,
    query: web::Query<QP>,
) -> Result<HttpResponse, AppError> {
    let reactions = service
        .pr
        .pr_reactions(
            &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(reactions)))
}

/// Add a reaction to a PR
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/reactions",
    tag = "Pull Requests",
    operation_id = "prAddReaction",
    params(PrPath),
    request_body(content = CreateReactionParams, description = "Reaction parameters", content_type = "application/json"),
    responses(
        (status = 201, description = "Reaction added.", body = ApiResponse<PrReaction>),
        (status = 400, description = "Invalid content or target type", body = ApiErrorResponse),
        (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 add_reaction(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PrPath>,
    params: web::Json<CreateReactionParams>,
) -> Result<HttpResponse, AppError> {
    let reaction = service
        .pr
        .pr_add_reaction(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.number,
            params.into_inner(),
        )
        .await?;
    Ok(HttpResponse::Created().json(ApiResponse::new(reaction)))
}

/// Remove a reaction. Only the reaction author can remove it.
#[utoipa::path(
    delete,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/reactions/{reaction_id}",
    tag = "Pull Requests",
    operation_id = "prRemoveReaction",
    params(ReactionPath),
    responses(
        (status = 200, description = "Reaction removed.", body = ApiResponse<String>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 403, description = "Cannot remove another user's reaction", body = ApiErrorResponse),
        (status = 404, description = "Reaction not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn remove_reaction(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<ReactionPath>,
) -> Result<HttpResponse, AppError> {
    service
        .pr
        .pr_remove_reaction(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.number,
            path.reaction_id,
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new("Reaction removed".to_string())))
}