//! Admin CRUD endpoints for AI Providers, Models, Versions, and Pricing.
//!
//! All write operations use `Session::no_op()` (system caller) which passes
//! the `require_system_caller` check in the service layer.

use actix_web::{HttpRequest, HttpResponse, Result, web};
use service::agent::provider::{CreateProviderRequest as SvcCreateProvider, UpdateProviderRequest as SvcUpdateProvider};
use service::agent::model::{CreateModelRequest as SvcCreateModel, UpdateModelRequest as SvcUpdateModel};
use service::agent::model_version::{CreateModelVersionRequest as SvcCreateVersion, UpdateModelVersionRequest as SvcUpdateVersion};
use service::agent::model_pricing::UpdateModelPricingRequest as SvcUpdatePricing;
use service::AppService;
use uuid::Uuid;

use crate::error::ApiError;
use crate::ApiResponse;
use service::error::AppError;

/// Validate the `x-admin-api-key` header against ADMIN_API_SHARED_KEY env var.
fn validate_admin_key(req: &HttpRequest) -> Result<(), ApiError> {
    let expected = std::env::var("ADMIN_API_SHARED_KEY").ok();
    let Some(expected) = expected else {
        return Err(ApiError(AppError::InternalServerError(
            "ADMIN_API_SHARED_KEY not configured".into(),
        )));
    };
    let provided = req
        .headers()
        .get("x-admin-api-key")
        .and_then(|v| v.to_str().ok())
        .ok_or(ApiError(AppError::Unauthorized))?;
    if provided != expected {
        return Err(ApiError(AppError::Unauthorized));
    }
    Ok(())
}

// ─── Provider CRUD ─────────────────────────────────────────────────────────────

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminCreateProvider {
    pub name: String,
    pub display_name: String,
    pub website: Option<String>,
}

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminUpdateProvider {
    pub display_name: Option<String>,
    pub website: Option<String>,
    pub status: Option<String>,
}

#[utoipa::path(
    post,
    path = "/api/admin/ai/providers",
    request_body = AdminCreateProvider,
    responses(
        (status = 200, description = "Provider created"),
        (status = 401),
        (status = 400),
    ),
    tag = "Admin"
)]
pub async fn admin_provider_create(
    req: HttpRequest,
    service: web::Data<AppService>,
    body: web::Json<AdminCreateProvider>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let session = session::Session::no_op();
    let svc_body = SvcCreateProvider {
        name: body.name.clone(),
        display_name: body.display_name.clone(),
        website: body.website.clone(),
    };
    let resp = service.agent_provider_create(svc_body, &session).await?;
    Ok(ApiResponse::ok(resp).to_response())
}

#[utoipa::path(
    patch,
    path = "/api/admin/ai/providers/{id}",
    params(("id" = Uuid, Path)),
    request_body = AdminUpdateProvider,
    responses(
        (status = 200, description = "Provider updated"),
        (status = 401),
        (status = 404),
    ),
    tag = "Admin"
)]
pub async fn admin_provider_update(
    req: HttpRequest,
    service: web::Data<AppService>,
    path: web::Path<Uuid>,
    body: web::Json<AdminUpdateProvider>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let id = path.into_inner();
    let session = session::Session::no_op();
    let svc_body = SvcUpdateProvider {
        display_name: body.display_name.clone(),
        website: body.website.clone(),
        status: body.status.clone(),
    };
    let resp = service.agent_provider_update(id, svc_body, &session).await?;
    Ok(ApiResponse::ok(resp).to_response())
}

#[utoipa::path(
    delete,
    path = "/api/admin/ai/providers/{id}",
    params(("id" = Uuid, Path)),
    responses(
        (status = 200),
        (status = 401),
        (status = 404),
    ),
    tag = "Admin"
)]
pub async fn admin_provider_delete(
    req: HttpRequest,
    service: web::Data<AppService>,
    path: web::Path<Uuid>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let id = path.into_inner();
    let session = session::Session::no_op();
    service.agent_provider_delete(id, &session).await?;
    Ok(ApiResponse::ok(serde_json::json!({ "deleted": true })).to_response())
}

// ─── Model CRUD ────────────────────────────────────────────────────────────────

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminCreateModel {
    pub provider_id: Uuid,
    pub name: String,
    pub modality: String,
    pub capability: String,
    pub context_length: i64,
    #[serde(default)]
    pub max_output_tokens: Option<i64>,
    #[serde(default)]
    pub training_cutoff: Option<chrono::DateTime<chrono::Utc>>,
    #[serde(default)]
    pub is_open_source: bool,
}

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminUpdateModel {
    pub display_name: Option<String>,
    pub modality: Option<String>,
    pub capability: Option<String>,
    pub context_length: Option<i64>,
    pub max_output_tokens: Option<i64>,
    pub training_cutoff: Option<chrono::DateTime<chrono::Utc>>,
    #[serde(default)]
    pub is_open_source: Option<bool>,
    pub status: Option<String>,
}

#[utoipa::path(
    post,
    path = "/api/admin/ai/models",
    request_body = AdminCreateModel,
    responses(
        (status = 200, description = "Model created"),
        (status = 401),
        (status = 400),
    ),
    tag = "Admin"
)]
pub async fn admin_model_create(
    req: HttpRequest,
    service: web::Data<AppService>,
    body: web::Json<AdminCreateModel>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let session = session::Session::no_op();
    let svc_body = SvcCreateModel {
        provider_id: body.provider_id,
        name: body.name.clone(),
        modality: body.modality.clone(),
        capability: body.capability.clone(),
        context_length: body.context_length,
        max_output_tokens: body.max_output_tokens,
        training_cutoff: body.training_cutoff,
        is_open_source: body.is_open_source,
    };
    let resp = service.agent_model_create(svc_body, &session).await?;
    Ok(ApiResponse::ok(resp).to_response())
}

#[utoipa::path(
    patch,
    path = "/api/admin/ai/models/{id}",
    params(("id" = Uuid, Path)),
    request_body = AdminUpdateModel,
    responses(
        (status = 200, description = "Model updated"),
        (status = 401),
        (status = 404),
    ),
    tag = "Admin"
)]
pub async fn admin_model_update(
    req: HttpRequest,
    service: web::Data<AppService>,
    path: web::Path<Uuid>,
    body: web::Json<AdminUpdateModel>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let id = path.into_inner();
    let session = session::Session::no_op();
    let svc_body = SvcUpdateModel {
        display_name: body.display_name.clone(),
        modality: body.modality.clone(),
        capability: body.capability.clone(),
        context_length: body.context_length,
        max_output_tokens: body.max_output_tokens,
        training_cutoff: body.training_cutoff,
        is_open_source: body.is_open_source,
        status: body.status.clone(),
    };
    let resp = service.agent_model_update(id, svc_body, &session).await?;
    Ok(ApiResponse::ok(resp).to_response())
}

#[utoipa::path(
    delete,
    path = "/api/admin/ai/models/{id}",
    params(("id" = Uuid, Path)),
    responses(
        (status = 200),
        (status = 401),
        (status = 404),
    ),
    tag = "Admin"
)]
pub async fn admin_model_delete(
    req: HttpRequest,
    service: web::Data<AppService>,
    path: web::Path<Uuid>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let id = path.into_inner();
    let session = session::Session::no_op();
    service.agent_model_delete(id, &session).await?;
    Ok(ApiResponse::ok(serde_json::json!({ "deleted": true })).to_response())
}

// ─── Model Version CRUD ────────────────────────────────────────────────────────

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminCreateVersion {
    pub model_id: Uuid,
    pub version: String,
    #[serde(default)]
    pub release_date: Option<chrono::DateTime<chrono::Utc>>,
    #[serde(default)]
    pub change_log: Option<String>,
    #[serde(default)]
    pub is_default: bool,
}

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminUpdateVersion {
    pub version: Option<String>,
    pub release_date: Option<chrono::DateTime<chrono::Utc>>,
    pub change_log: Option<String>,
    #[serde(default)]
    pub is_default: Option<bool>,
    pub status: Option<String>,
}

#[utoipa::path(
    post,
    path = "/api/admin/ai/versions",
    request_body = AdminCreateVersion,
    responses(
        (status = 200, description = "Version created"),
        (status = 401),
        (status = 400),
    ),
    tag = "Admin"
)]
pub async fn admin_version_create(
    req: HttpRequest,
    service: web::Data<AppService>,
    body: web::Json<AdminCreateVersion>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let session = session::Session::no_op();
    let svc_body = SvcCreateVersion {
        model_id: body.model_id,
        version: body.version.clone(),
        release_date: body.release_date,
        change_log: body.change_log.clone(),
        is_default: body.is_default,
    };
    let resp = service.agent_model_version_create(svc_body, &session).await?;
    Ok(ApiResponse::ok(resp).to_response())
}

#[utoipa::path(
    patch,
    path = "/api/admin/ai/versions/{id}",
    params(("id" = Uuid, Path)),
    request_body = AdminUpdateVersion,
    responses(
        (status = 200),
        (status = 401),
        (status = 404),
    ),
    tag = "Admin"
)]
pub async fn admin_version_update(
    req: HttpRequest,
    service: web::Data<AppService>,
    path: web::Path<Uuid>,
    body: web::Json<AdminUpdateVersion>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let id = path.into_inner();
    let session = session::Session::no_op();
    let svc_body = SvcUpdateVersion {
        version: body.version.clone(),
        release_date: body.release_date,
        change_log: body.change_log.clone(),
        is_default: body.is_default,
        status: body.status.clone(),
    };
    let resp = service.agent_model_version_update(id, svc_body, &session).await?;
    Ok(ApiResponse::ok(resp).to_response())
}

#[utoipa::path(
    delete,
    path = "/api/admin/ai/versions/{id}",
    params(("id" = Uuid, Path)),
    responses(
        (status = 200),
        (status = 401),
        (status = 404),
    ),
    tag = "Admin"
)]
pub async fn admin_version_delete(
    req: HttpRequest,
    service: web::Data<AppService>,
    path: web::Path<Uuid>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let id = path.into_inner();
    let session = session::Session::no_op();
    service.agent_model_version_delete(id, &session).await?;
    Ok(ApiResponse::ok(serde_json::json!({ "deleted": true })).to_response())
}

// ─── Model Pricing CRUD ───────────────────────────────────────────────────────

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminCreatePricing {
    pub model_version_id: Uuid,
    pub input_price_per_1k_tokens: String,
    pub output_price_per_1k_tokens: String,
    pub currency: String,
    pub effective_from: chrono::DateTime<chrono::Utc>,
}

#[derive(serde::Deserialize, utoipa::ToSchema)]
pub struct AdminUpdatePricing {
    pub input_price_per_1k_tokens: Option<String>,
    pub output_price_per_1k_tokens: Option<String>,
    pub currency: Option<String>,
    pub effective_from: Option<chrono::DateTime<chrono::Utc>>,
}

#[utoipa::path(
    patch,
    path = "/api/admin/ai/pricing/{id}",
    params(("id" = i64, Path)),
    request_body = AdminUpdatePricing,
    responses(
        (status = 200),
        (status = 401),
        (status = 404),
    ),
    tag = "Admin"
)]
pub async fn admin_pricing_update(
    req: HttpRequest,
    service: web::Data<AppService>,
    path: web::Path<i64>,
    body: web::Json<AdminUpdatePricing>,
) -> Result<HttpResponse, ApiError> {
    validate_admin_key(&req)?;
    let id = path.into_inner();
    let session = session::Session::no_op();
    let svc_body = SvcUpdatePricing {
        input_price_per_1k_tokens: body.input_price_per_1k_tokens.clone(),
        output_price_per_1k_tokens: body.output_price_per_1k_tokens.clone(),
        currency: body.currency.clone(),
        effective_from: body.effective_from,
    };
    let resp = service.agent_model_pricing_update(id, svc_body, &session).await?;
    Ok(ApiResponse::ok(resp).to_response())
}