use axum::extract::{Path, Query, State};
use export::rest::AppResponseData;
use jwt::Session;
use serde::Deserialize;
use utoipa::IntoParams;

use crate::errors::{ApiError, GitApiError};
use crate::handler::{RepoPath, resolve_reader};
use crate::service::GitService;
use crate::service::stars::{RepoStarResp, StargazerDto};

#[derive(Debug, Clone, Deserialize, IntoParams)]
pub struct StarsPath {
    pub space_name: String,
    pub repo_name: String,
}

#[derive(Debug, Clone, Deserialize, IntoParams)]
pub struct StarQuery {
    pub limit: Option<u64>,
    pub offset: Option<u64>,
}

#[utoipa::path(
    put,
    path = "/repos/{space_name}/{repo_name}/star",
    tag = "repos",
    description = "为仓库加星并返回加星后的总星数。",
    params(RepoPath),
    responses(
        (status = 200, description = "star repo", body = AppResponseData<RepoStarResp>)
    )
)]
pub async fn star_repo(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<RepoPath>,
) -> Result<AppResponseData<RepoStarResp>, ApiError> {
    let (ctx, viewer) = resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let uid = viewer.ok_or_else(|| ApiError::from(GitApiError::Unauthorized))?;
    let out = service
        .star_repo(&ctx, uid)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}

#[utoipa::path(
    delete,
    path = "/repos/{space_name}/{repo_name}/star",
    tag = "repos",
    description = "取消当前用户对仓库的加星并返回最新星数。",
    params(RepoPath),
    responses(
        (status = 200, description = "unstar repo", body = AppResponseData<RepoStarResp>)
    )
)]
pub async fn unstar_repo(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<RepoPath>,
) -> Result<AppResponseData<RepoStarResp>, ApiError> {
    let (ctx, viewer) = resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let uid = viewer.ok_or_else(|| ApiError::from(GitApiError::Unauthorized))?;
    let out = service
        .unstar_repo(&ctx, uid)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}

#[utoipa::path(
    get,
    path = "/repos/{space_name}/{repo_name}/stargazers",
    tag = "repos",
    description = "分页列出最近为仓库加星的用户。",
    params(RepoPath, StarQuery),
    responses(
        (status = 200, description = "list stargazers", body = AppResponseData<Vec<StargazerDto>>)
    )
)]
pub async fn list_stargazers(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<RepoPath>,
    Query(q): Query<StarQuery>,
) -> Result<AppResponseData<Vec<StargazerDto>>, ApiError> {
    let ctx = resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?
    .0;
    let limit = q.limit.unwrap_or(50).clamp(1, 100);
    let offset = q
        .offset
        .unwrap_or(0)
        .clamp(0, export::pagination::MAX_OFFSET);
    let out = service
        .list_stargazers(&ctx, limit, offset)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}