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

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::base_info::{self, UserBaseInfo};
use crate::models::issues::IssueDetail;
use crate::service::AppService;
use crate::service::issues::core::IssueListFilters;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct PathParams {
    /// Workspace name (unique identifier)
    pub workspace_name: String,
}

#[derive(Debug, Deserialize, IntoParams)]
pub struct QueryParams {
    /// Filter by issue state ("open" or "closed")
    pub state: Option<String>,
    /// Filter by priority level
    pub priority: Option<String>,
    /// Filter by author user ID
    pub author_id: Option<uuid::Uuid>,
    /// Filter by assignee user ID
    pub assignee_id: Option<uuid::Uuid>,
    /// Filter by milestone ID
    pub milestone_id: Option<uuid::Uuid>,
    /// Filter by label ID
    pub label_id: Option<uuid::Uuid>,
    /// Maximum number of issues to return (default: 50, max: 100)
    pub limit: Option<i64>,
    /// Number of issues to skip for pagination (default: 0)
    pub offset: Option<i64>,
}

/// List issues in a workspace
///
/// Returns a paginated list of issues in the workspace, sorted by issue number (newest first).
/// Supports filtering by state, priority, author, assignee, milestone, and label.
/// Only returns issues visible to the authenticated user (public + workspace member access).
/// Requires authentication.
#[utoipa::path(
    get,
    path = "/api/v1/workspaces/{workspace_name}/issues",
    tag = "Issues",
    operation_id = "issueList",
    params(PathParams, QueryParams),
    responses(
        (status = 200, description = "Issues listed successfully. Returns filtered array of issue objects with metadata.", body = ApiResponse<Vec<IssueDetail>>),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 404, description = "Workspace not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn list(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    query: web::Query<QueryParams>,
) -> Result<HttpResponse, AppError> {
    let filters = IssueListFilters {
        state: query.state.clone(),
        priority: query.priority.clone(),
        author_id: query.author_id,
        assignee_id: query.assignee_id,
        milestone_id: query.milestone_id,
        label_id: query.label_id,
    };
    let issues = service
        .issue
        .issue_list(
            &session,
            &path.workspace_name,
            filters,
            query.limit.unwrap_or(50),
            query.offset.unwrap_or(0),
        )
        .await?;
    let user_ids: Vec<_> = issues.iter().map(|i| i.author_id).collect();
    let users = base_info::resolve_users(&service.ctx.db, &user_ids).await?;
    let details: Vec<IssueDetail> = issues
        .into_iter()
        .map(|i| {
            let author = users
                .get(&i.author_id)
                .cloned()
                .unwrap_or_else(|| UserBaseInfo::placeholder(i.author_id));
            i.into_detail(author)
        })
        .collect();
    Ok(HttpResponse::Ok().json(ApiResponse::new(details)))
}