gitks/service/workspace/members.rs

use serde::{Deserialize, Serialize};
use uuid::Uuid;

use super::util::{clamp_limit_offset, ensure_affected, role_level};
use crate::error::AppError;
use crate::models::common::Role;
use crate::models::workspaces::{Workspace, WorkspaceMember};
use crate::service::WorkspaceService;
use crate::session::Session;

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema, utoipa::IntoParams)]
pub struct AddMemberParams {
    pub user_id: Uuid,
    pub role: Option<String>,
}

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct UpdateMemberRoleParams {
    pub role: String,
}

impl WorkspaceService {
    pub async fn workspace_members(
        &self,
        ctx: &Session,
        ws: &Workspace,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<WorkspaceMember>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        self.ensure_workspace_readable(user_uid, &ws).await?;
        let (limit, offset) = clamp_limit_offset(limit, offset);
        sqlx::query_as::<_, WorkspaceMember>(
            "SELECT id, workspace_id, user_id, role, status, invited_by, joined_at, \
             last_active_at, created_at, updated_at FROM workspace_member \
             WHERE workspace_id = $1 AND status = 'active' ORDER BY created_at ASC LIMIT $2 OFFSET $3",
        )
        .bind(ws.id)
        .bind(limit)
        .bind(offset)
        .fetch_all(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }

    pub async fn workspace_add_member(
        &self,
        ctx: &Session,
        ws: &Workspace,
        params: AddMemberParams,
    ) -> Result<WorkspaceMember, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let actor_role = self
            .ensure_workspace_role_at_least(user_uid, &ws, Role::Admin)
            .await?;

        let settings_allow = sqlx::query_scalar::<_, bool>(
            "SELECT allow_member_invites FROM workspace_settings WHERE workspace_id = $1",
        )
        .bind(ws.id)
        .fetch_one(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)?;

        if !settings_allow && role_level(actor_role) < role_level(Role::Owner) {
            return Err(AppError::BadRequest(
                "member invitations are disabled".into(),
            ));
        }

        let existing = sqlx::query_scalar::<_, bool>(
            "SELECT EXISTS(SELECT 1 FROM workspace_member WHERE workspace_id = $1 AND user_id = $2)",
        )
        .bind(ws.id)
        .bind(params.user_id)
        .fetch_one(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)?;

        if existing {
            return Err(AppError::Conflict("user is already a member".into()));
        }

        let role = params
            .role
            .as_deref()
            .and_then(|r| r.parse::<Role>().ok())
            .unwrap_or(ws.default_role.parse().unwrap_or(Role::Member));

        if role == Role::Owner {
            return Err(AppError::BadRequest("cannot add member as owner".into()));
        }
        if role == Role::Unknown {
            return Err(AppError::BadRequest("invalid role".into()));
        }

        if actor_role != Role::Owner && role_level(role) >= role_level(actor_role) {
            return Err(AppError::BadRequest(
                "cannot grant role equal to or higher than your own".into(),
            ));
        }

        let now = chrono::Utc::now();
        let mut txn = self
            .ctx
            .db
            .writer()
            .begin()
            .await
            .map_err(|_| AppError::TxnError)?;
        sqlx::query("SET LOCAL app.current_user_id = $1")
            .bind(user_uid)
            .execute(&mut *txn)
            .await
            .map_err(AppError::Database)?;

        let member = sqlx::query_as::<_, WorkspaceMember>(
            "INSERT INTO workspace_member (id, workspace_id, user_id, role, status, invited_by, joined_at, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, 'active', $5, $6, $6, $6) \
             RETURNING id, workspace_id, user_id, role, status, invited_by, joined_at, last_active_at, created_at, updated_at",
        )
        .bind(Uuid::now_v7())
        .bind(ws.id)
        .bind(params.user_id)
        .bind(role.to_string())
        .bind(user_uid)
        .bind(now)
        .fetch_one(&mut *txn)
        .await
        .map_err(AppError::Database)?;

        sqlx::query(
            "UPDATE workspace_stats SET members_count = members_count + 1, updated_at = $1 WHERE workspace_id = $2",
        )
        .bind(now)
        .bind(ws.id)
        .execute(&mut *txn)
        .await
        .map_err(AppError::Database)?;

        txn.commit().await.map_err(|_| AppError::TxnError)?;
        Ok(member)
    }

    pub async fn workspace_update_member_role(
        &self,
        ctx: &Session,
        ws: &Workspace,
        member_id: Uuid,
        params: UpdateMemberRoleParams,
    ) -> Result<WorkspaceMember, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let actor_role = self
            .ensure_workspace_role_at_least(user_uid, &ws, Role::Admin)
            .await?;

        let new_role = params
            .role
            .parse::<Role>()
            .map_err(|_| AppError::BadRequest("invalid role".into()))?;
        if new_role == Role::Owner {
            return Err(AppError::BadRequest(
                "use workspace_transfer_owner to change owner".into(),
            ));
        }
        if new_role == Role::Unknown {
            return Err(AppError::BadRequest("invalid role".into()));
        }

        if actor_role != Role::Owner && role_level(new_role) >= role_level(actor_role) {
            return Err(AppError::BadRequest(
                "cannot grant role equal to or higher than your own".into(),
            ));
        }

        let target = sqlx::query_as::<_, WorkspaceMember>(
            "SELECT id, workspace_id, user_id, role, status, invited_by, joined_at, \
             last_active_at, created_at, updated_at FROM workspace_member \
             WHERE id = $1 AND workspace_id = $2",
        )
        .bind(member_id)
        .bind(ws.id)
        .fetch_optional(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)?
        .ok_or(AppError::NotFound("member not found".into()))?;

        if target.role == Role::Owner {
            return Err(AppError::BadRequest(
                "cannot change owner role; use workspace_transfer_owner".into(),
            ));
        }
        if role_level(actor_role) <= role_level(target.role) && actor_role != Role::Owner {
            return Err(AppError::BadRequest(
                "cannot change role of a member with equal or higher role".into(),
            ));
        }

        let now = chrono::Utc::now();
        let mut txn = self
            .ctx
            .db
            .writer()
            .begin()
            .await
            .map_err(|_| AppError::TxnError)?;
        sqlx::query("SET LOCAL app.current_user_id = $1")
            .bind(user_uid)
            .execute(&mut *txn)
            .await
            .map_err(AppError::Database)?;

        let result = sqlx::query_as::<_, WorkspaceMember>(
            "UPDATE workspace_member SET role = $1, updated_at = $2 WHERE id = $3 AND workspace_id = $4 \
             RETURNING id, workspace_id, user_id, role, status, invited_by, joined_at, last_active_at, created_at, updated_at",
        )
        .bind(new_role.to_string())
        .bind(now)
        .bind(member_id)
        .bind(ws.id)
        .fetch_one(&mut *txn)
        .await
        .map_err(AppError::Database)?;

        txn.commit().await.map_err(|_| AppError::TxnError)?;
        Ok(result)
    }

    pub async fn workspace_remove_member(
        &self,
        ctx: &Session,
        ws: &Workspace,
        member_id: Uuid,
    ) -> Result<(), AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let actor_role = self
            .ensure_workspace_role_at_least(user_uid, &ws, Role::Admin)
            .await?;

        let target = sqlx::query_as::<_, WorkspaceMember>(
            "SELECT id, workspace_id, user_id, role, status, invited_by, joined_at, \
             last_active_at, created_at, updated_at FROM workspace_member \
             WHERE id = $1 AND workspace_id = $2",
        )
        .bind(member_id)
        .bind(ws.id)
        .fetch_optional(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)?
        .ok_or(AppError::NotFound("member not found".into()))?;

        if target.role == Role::Owner {
            return Err(AppError::BadRequest(
                "cannot remove owner; transfer ownership first".into(),
            ));
        }
        if role_level(actor_role) <= role_level(target.role) && actor_role != Role::Owner {
            return Err(AppError::BadRequest(
                "cannot remove a member with equal or higher role".into(),
            ));
        }

        let now = chrono::Utc::now();
        let mut txn = self
            .ctx
            .db
            .writer()
            .begin()
            .await
            .map_err(|_| AppError::TxnError)?;
        sqlx::query("SET LOCAL app.current_user_id = $1")
            .bind(user_uid)
            .execute(&mut *txn)
            .await
            .map_err(AppError::Database)?;

        let result =
            sqlx::query("DELETE FROM workspace_member WHERE id = $1 AND workspace_id = $2")
                .bind(member_id)
                .bind(ws.id)
                .execute(&mut *txn)
                .await
                .map_err(AppError::Database)?;
        ensure_affected(result.rows_affected(), "member not found")?;

        sqlx::query(
            "UPDATE workspace_stats SET members_count = GREATEST(members_count - 1, 0), updated_at = $1 WHERE workspace_id = $2",
        )
        .bind(now)
        .bind(ws.id)
        .execute(&mut *txn)
        .await
        .map_err(AppError::Database)?;

        txn.commit().await.map_err(|_| AppError::TxnError)?;
        Ok(())
    }

    pub async fn workspace_leave(&self, ctx: &Session, ws: &Workspace) -> Result<(), AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;

        if ws.owner_id == user_uid {
            return Err(AppError::BadRequest(
                "owner cannot leave; transfer ownership first".into(),
            ));
        }

        let now = chrono::Utc::now();
        let mut txn = self
            .ctx
            .db
            .writer()
            .begin()
            .await
            .map_err(|_| AppError::TxnError)?;
        sqlx::query("SET LOCAL app.current_user_id = $1")
            .bind(user_uid)
            .execute(&mut *txn)
            .await
            .map_err(AppError::Database)?;

        let result =
            sqlx::query("DELETE FROM workspace_member WHERE workspace_id = $1 AND user_id = $2")
                .bind(ws.id)
                .bind(user_uid)
                .execute(&mut *txn)
                .await
                .map_err(AppError::Database)?;
        ensure_affected(result.rows_affected(), "not a member")?;

        sqlx::query(
            "UPDATE workspace_stats SET members_count = GREATEST(members_count - 1, 0), updated_at = $1 WHERE workspace_id = $2",
        )
        .bind(now)
        .bind(ws.id)
        .execute(&mut *txn)
        .await
        .map_err(AppError::Database)?;

        txn.commit().await.map_err(|_| AppError::TxnError)?;
        Ok(())
    }
}