use axum::Extension;
use axum::extract::{FromRef, Path, State};
use axum::response::Json;
use validator::Validate;

use erp_core::error::AppError;
use erp_core::types::{ApiResponse, TenantContext};
use uuid::Uuid;

use crate::auth_state::AuthState;
use crate::dto::{
    CreateDepartmentReq, CreateOrganizationReq, CreatePositionReq, DepartmentResp,
    OrganizationResp, PositionResp, UpdateDepartmentReq, UpdateOrganizationReq, UpdatePositionReq,
};
use crate::service::dept_service::DeptService;
use crate::service::org_service::OrgService;
use crate::service::position_service::PositionService;
use erp_core::rbac::require_permission;

// --- Organization handlers ---

#[utoipa::path(
    get,
    path = "/api/v1/organizations",
    responses(
        (status = 200, description = "成功", body = ApiResponse<Vec<OrganizationResp>>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// GET /api/v1/organizations
///
/// List all organizations within the current tenant as a nested tree.
/// Requires the `organization.list` permission.
pub async fn list_organizations<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<Vec<OrganizationResp>>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "organization.list")?;

    let tree = OrgService::get_tree(ctx.tenant_id, &state.db).await?;
    Ok(Json(ApiResponse::ok(tree)))
}

#[utoipa::path(
    post,
    path = "/api/v1/organizations",
    request_body = CreateOrganizationReq,
    responses(
        (status = 200, description = "创建成功", body = ApiResponse<OrganizationResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// POST /api/v1/organizations
///
/// Create a new organization within the current tenant.
/// Requires the `organization.create` permission.
pub async fn create_organization<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Json(req): Json<CreateOrganizationReq>,
) -> Result<Json<ApiResponse<OrganizationResp>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "organization.create")?;

    req.validate()
        .map_err(|e| AppError::Validation(e.to_string()))?;

    let org = OrgService::create(
        ctx.tenant_id,
        ctx.user_id,
        &req,
        &state.db,
        &state.event_bus,
    )
    .await?;

    Ok(Json(ApiResponse::ok(org)))
}

#[utoipa::path(
    put,
    path = "/api/v1/organizations/{id}",
    params(("id" = Uuid, Path, description = "组织ID")),
    request_body = UpdateOrganizationReq,
    responses(
        (status = 200, description = "更新成功", body = ApiResponse<OrganizationResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
        (status = 404, description = "组织不存在"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// PUT /api/v1/organizations/{id}
///
/// Update editable organization fields (name, code, sort_order).
/// Requires the `organization.update` permission.
pub async fn update_organization<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<UpdateOrganizationReq>,
) -> Result<Json<ApiResponse<OrganizationResp>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "organization.update")?;

    let org = OrgService::update(id, ctx.tenant_id, ctx.user_id, &req, &state.db).await?;
    Ok(Json(ApiResponse::ok(org)))
}

#[utoipa::path(
    delete,
    path = "/api/v1/organizations/{id}",
    params(("id" = Uuid, Path, description = "组织ID")),
    responses(
        (status = 200, description = "组织已删除"),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
        (status = 404, description = "组织不存在"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// DELETE /api/v1/organizations/{id}
///
/// Soft-delete an organization by ID.
/// Requires the `organization.delete` permission.
pub async fn delete_organization<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "organization.delete")?;

    OrgService::delete(id, ctx.tenant_id, ctx.user_id, &state.db, &state.event_bus).await?;

    Ok(Json(ApiResponse {
        success: true,
        data: None,
        message: Some("组织已删除".to_string()),
    }))
}

// --- Department handlers ---

#[utoipa::path(
    get,
    path = "/api/v1/organizations/{org_id}/departments",
    params(("org_id" = Uuid, Path, description = "组织ID")),
    responses(
        (status = 200, description = "成功", body = ApiResponse<Vec<DepartmentResp>>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// GET /api/v1/organizations/{org_id}/departments
///
/// List all departments for an organization as a nested tree.
/// Requires the `department.list` permission.
pub async fn list_departments<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(org_id): Path<Uuid>,
) -> Result<Json<ApiResponse<Vec<DepartmentResp>>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "department.list")?;

    let tree = DeptService::list_tree(org_id, ctx.tenant_id, &state.db).await?;
    Ok(Json(ApiResponse::ok(tree)))
}

#[utoipa::path(
    post,
    path = "/api/v1/organizations/{org_id}/departments",
    params(("org_id" = Uuid, Path, description = "组织ID")),
    request_body = CreateDepartmentReq,
    responses(
        (status = 200, description = "创建成功", body = ApiResponse<DepartmentResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// POST /api/v1/organizations/{org_id}/departments
///
/// Create a new department under the specified organization.
/// Requires the `department.create` permission.
pub async fn create_department<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(org_id): Path<Uuid>,
    Json(req): Json<CreateDepartmentReq>,
) -> Result<Json<ApiResponse<DepartmentResp>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "department.create")?;

    req.validate()
        .map_err(|e| AppError::Validation(e.to_string()))?;

    let dept = DeptService::create(
        org_id,
        ctx.tenant_id,
        ctx.user_id,
        &req,
        &state.db,
        &state.event_bus,
    )
    .await?;

    Ok(Json(ApiResponse::ok(dept)))
}

#[utoipa::path(
    put,
    path = "/api/v1/departments/{id}",
    params(("id" = Uuid, Path, description = "部门ID")),
    request_body = UpdateDepartmentReq,
    responses(
        (status = 200, description = "更新成功", body = ApiResponse<DepartmentResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
        (status = 404, description = "部门不存在"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// PUT /api/v1/departments/{id}
///
/// Update editable department fields (name, code, manager_id, sort_order).
/// Requires the `department.update` permission.
pub async fn update_department<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<UpdateDepartmentReq>,
) -> Result<Json<ApiResponse<DepartmentResp>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "department.update")?;

    let dept = DeptService::update(id, ctx.tenant_id, ctx.user_id, &req, &state.db).await?;
    Ok(Json(ApiResponse::ok(dept)))
}

#[utoipa::path(
    delete,
    path = "/api/v1/departments/{id}",
    params(("id" = Uuid, Path, description = "部门ID")),
    responses(
        (status = 200, description = "部门已删除"),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
        (status = 404, description = "部门不存在"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// DELETE /api/v1/departments/{id}
///
/// Soft-delete a department by ID.
/// Requires the `department.delete` permission.
pub async fn delete_department<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "department.delete")?;

    DeptService::delete(id, ctx.tenant_id, ctx.user_id, &state.db, &state.event_bus).await?;

    Ok(Json(ApiResponse {
        success: true,
        data: None,
        message: Some("部门已删除".to_string()),
    }))
}

// --- Position handlers ---

#[utoipa::path(
    get,
    path = "/api/v1/departments/{dept_id}/positions",
    params(("dept_id" = Uuid, Path, description = "部门ID")),
    responses(
        (status = 200, description = "成功", body = ApiResponse<Vec<PositionResp>>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// GET /api/v1/departments/{dept_id}/positions
///
/// List all positions for a department.
/// Requires the `position.list` permission.
pub async fn list_positions<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(dept_id): Path<Uuid>,
) -> Result<Json<ApiResponse<Vec<PositionResp>>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "position.list")?;

    let positions = PositionService::list(dept_id, ctx.tenant_id, &state.db).await?;
    Ok(Json(ApiResponse::ok(positions)))
}

#[utoipa::path(
    post,
    path = "/api/v1/departments/{dept_id}/positions",
    params(("dept_id" = Uuid, Path, description = "部门ID")),
    request_body = CreatePositionReq,
    responses(
        (status = 200, description = "创建成功", body = ApiResponse<PositionResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// POST /api/v1/departments/{dept_id}/positions
///
/// Create a new position under the specified department.
/// Requires the `position.create` permission.
pub async fn create_position<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(dept_id): Path<Uuid>,
    Json(req): Json<CreatePositionReq>,
) -> Result<Json<ApiResponse<PositionResp>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "position.create")?;

    req.validate()
        .map_err(|e| AppError::Validation(e.to_string()))?;

    let pos = PositionService::create(
        dept_id,
        ctx.tenant_id,
        ctx.user_id,
        &req,
        &state.db,
        &state.event_bus,
    )
    .await?;

    Ok(Json(ApiResponse::ok(pos)))
}

#[utoipa::path(
    put,
    path = "/api/v1/positions/{id}",
    params(("id" = Uuid, Path, description = "岗位ID")),
    request_body = UpdatePositionReq,
    responses(
        (status = 200, description = "更新成功", body = ApiResponse<PositionResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
        (status = 404, description = "岗位不存在"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// PUT /api/v1/positions/{id}
///
/// Update editable position fields (name, code, level, sort_order).
/// Requires the `position.update` permission.
pub async fn update_position<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<UpdatePositionReq>,
) -> Result<Json<ApiResponse<PositionResp>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "position.update")?;

    let pos = PositionService::update(id, ctx.tenant_id, ctx.user_id, &req, &state.db).await?;
    Ok(Json(ApiResponse::ok(pos)))
}

#[utoipa::path(
    delete,
    path = "/api/v1/positions/{id}",
    params(("id" = Uuid, Path, description = "岗位ID")),
    responses(
        (status = 200, description = "岗位已删除"),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
        (status = 404, description = "岗位不存在"),
    ),
    security(("bearer_auth" = [])),
    tag = "组织管理"
)]
/// DELETE /api/v1/positions/{id}
///
/// Soft-delete a position by ID.
/// Requires the `position.delete` permission.
pub async fn delete_position<S>(
    State(state): State<AuthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    AuthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "position.delete")?;

    PositionService::delete(id, ctx.tenant_id, ctx.user_id, &state.db, &state.event_bus).await?;

    Ok(Json(ApiResponse {
        success: true,
        data: None,
        message: Some("岗位已删除".to_string()),
    }))
}