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::{PrLabel, PrLabelRelation};
use crate::service::AppService;
use crate::service::pr::labels::{CreatePrLabelParams, UpdatePrLabelParams};
use crate::session::Session;

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

#[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 LabelPath {
    /// 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,
    /// Label ID (UUID)
    pub label_id: uuid::Uuid,
}

#[derive(Debug, Deserialize, IntoParams)]
pub struct LabelIdPath {
    /// Workspace name (unique identifier)
    pub workspace_name: String,
    /// Repository name (unique within the workspace)
    pub repo_name: String,
    /// Label ID (UUID)
    pub label_id: uuid::Uuid,
}

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

// ── Repo-level labels ──

/// List PR labels in a repository
#[utoipa::path(
    get,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/labels",
    tag = "Pull Requests",
    operation_id = "prListLabels",
    params(RepoPath),
    responses(
        (status = 200, description = "Labels listed successfully.", body = ApiResponse<Vec<PrLabel>>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 404, description = "Repo not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn list_labels(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<RepoPath>,
) -> Result<HttpResponse, AppError> {
    let labels = service
        .pr
        .pr_labels(&session, &path.workspace_name, &path.repo_name)
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(labels)))
}

/// Create a PR label. Requires Member role.
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/labels",
    tag = "Pull Requests",
    operation_id = "prCreateLabel",
    params(RepoPath),
    request_body(content = CreatePrLabelParams, description = "Label creation parameters", content_type = "application/json"),
    responses(
        (status = 201, description = "Label created.", body = ApiResponse<PrLabel>),
        (status = 400, description = "Invalid parameters", body = ApiErrorResponse),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions", body = ApiErrorResponse),
        (status = 404, description = "Repo not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn create_label(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<RepoPath>,
    params: web::Json<CreatePrLabelParams>,
) -> Result<HttpResponse, AppError> {
    let label = service
        .pr
        .pr_create_label(
            &session,
            &path.workspace_name,
            &path.repo_name,
            params.into_inner(),
        )
        .await?;
    Ok(HttpResponse::Created().json(ApiResponse::new(label)))
}

/// Update a PR label. Requires Admin role.
#[utoipa::path(
    put,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/labels/{label_id}",
    tag = "Pull Requests",
    operation_id = "prUpdateLabel",
    params(LabelIdPath),
    request_body(content = UpdatePrLabelParams, description = "Label update parameters", content_type = "application/json"),
    responses(
        (status = 200, description = "Label updated.", body = ApiResponse<PrLabel>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions (Admin required)", body = ApiErrorResponse),
        (status = 404, description = "Label not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn update_label(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<LabelIdPath>,
    params: web::Json<UpdatePrLabelParams>,
) -> Result<HttpResponse, AppError> {
    let label = service
        .pr
        .pr_update_label(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.label_id,
            params.into_inner(),
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(label)))
}

/// Delete a PR label. Requires Admin role.
#[utoipa::path(
    delete,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/labels/{label_id}",
    tag = "Pull Requests",
    operation_id = "prDeleteLabel",
    params(LabelIdPath),
    responses(
        (status = 200, description = "Label deleted.", body = ApiResponse<String>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions (Admin required)", body = ApiErrorResponse),
        (status = 404, description = "Label not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn delete_label(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<LabelIdPath>,
) -> Result<HttpResponse, AppError> {
    service
        .pr
        .pr_delete_label(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.label_id,
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new("Label deleted".to_string())))
}

// ── PR-level label relations ──

/// List labels assigned to a PR
#[utoipa::path(
    get,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/labels",
    tag = "Pull Requests",
    operation_id = "prListLabelRelations",
    params(PrPath, QP),
    responses(
        (status = 200, description = "Label relations listed.", body = ApiResponse<Vec<PrLabelRelation>>),
        (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_label_relations(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PrPath>,
    query: web::Query<QP>,
) -> Result<HttpResponse, AppError> {
    let rels = service
        .pr
        .pr_label_relations(
            &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(rels)))
}

/// Assign a label to a PR
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/labels/{label_id}",
    tag = "Pull Requests",
    operation_id = "prAssignLabel",
    params(LabelPath),
    responses(
        (status = 200, description = "Label assigned.", body = ApiResponse<PrLabelRelation>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions", body = ApiErrorResponse),
        (status = 404, description = "PR or label not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn assign_label(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<LabelPath>,
) -> Result<HttpResponse, AppError> {
    let rel = service
        .pr
        .pr_assign_label(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.number,
            path.label_id,
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(rel)))
}

/// Unassign a label from a PR
#[utoipa::path(
    delete,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}/labels/{label_id}",
    tag = "Pull Requests",
    operation_id = "prUnassignLabel",
    params(LabelPath),
    responses(
        (status = 200, description = "Label unassigned.", body = ApiResponse<String>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions", body = ApiErrorResponse),
        (status = 404, description = "Label not assigned", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn unassign_label(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<LabelPath>,
) -> Result<HttpResponse, AppError> {
    service
        .pr
        .pr_unassign_label(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.number,
            path.label_id,
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new("Label unassigned".to_string())))
}