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

use crate::error::AppError;
use crate::models::common::Provider;
use crate::models::workspaces::WorkspaceIntegration;
use crate::service::WorkspaceService;
use crate::session::Session;

use super::util::{clamp_limit_offset, ensure_affected, required_text};

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct CreateIntegrationParams {
    pub provider: String,
    pub name: String,
    pub config: Option<crate::models::json_types::WorkspaceIntegrationConfig>,
    pub secret_ciphertext: Option<String>,
    pub enabled: Option<bool>,
}

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct UpdateIntegrationParams {
    pub name: Option<String>,
    pub config: Option<crate::models::json_types::WorkspaceIntegrationConfig>,
    pub secret_ciphertext: Option<String>,
    pub enabled: Option<bool>,
}

impl WorkspaceService {
    pub async fn workspace_integrations(
        &self,
        ctx: &Session,
        workspace_id: Uuid,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<WorkspaceIntegration>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let ws = self.find_workspace_by_id(workspace_id).await?;
        self.ensure_workspace_role_at_least(user_uid, &ws, crate::models::common::Role::Admin)
            .await?;
        let (limit, offset) = clamp_limit_offset(limit, offset);
        sqlx::query_as::<_, WorkspaceIntegration>(
            "SELECT id, workspace_id, provider, name, config, secret_ciphertext, enabled, \
             installed_by, last_used_at, created_at, updated_at FROM workspace_integration \
             WHERE workspace_id = $1 ORDER BY created_at DESC LIMIT $2 OFFSET $3",
        )
        .bind(workspace_id)
        .bind(limit)
        .bind(offset)
        .fetch_all(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }

    pub async fn workspace_create_integration(
        &self,
        ctx: &Session,
        workspace_id: Uuid,
        params: CreateIntegrationParams,
    ) -> Result<WorkspaceIntegration, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let ws = self.find_workspace_by_id(workspace_id).await?;
        self.ensure_workspace_role_at_least(user_uid, &ws, crate::models::common::Role::Admin)
            .await?;

        let provider = params
            .provider
            .trim()
            .parse::<Provider>()
            .map_err(|_| AppError::BadRequest("invalid provider".into()))?;
        if provider == Provider::Unknown {
            return Err(AppError::BadRequest("invalid provider".into()));
        }
        let name = required_text(params.name, "name")?;
        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::<_, WorkspaceIntegration>(
            "INSERT INTO workspace_integration (id, workspace_id, provider, name, config, secret_ciphertext, \
             enabled, installed_by, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $9) \
             RETURNING id, workspace_id, provider, name, config, secret_ciphertext, enabled, \
             installed_by, last_used_at, created_at, updated_at",
        )
        .bind(Uuid::now_v7())
        .bind(workspace_id)
        .bind(provider)
        .bind(&name)
        .bind(params.config.map(sqlx::types::Json))
        .bind(&params.secret_ciphertext)
        .bind(params.enabled.unwrap_or(true))
        .bind(user_uid)
        .bind(now)
        .fetch_one(&mut *txn)
        .await
        .map_err(AppError::Database)?;

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

    pub async fn workspace_update_integration(
        &self,
        ctx: &Session,
        workspace_id: Uuid,
        integration_id: Uuid,
        params: UpdateIntegrationParams,
    ) -> Result<WorkspaceIntegration, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let ws = self.find_workspace_by_id(workspace_id).await?;
        self.ensure_workspace_role_at_least(user_uid, &ws, crate::models::common::Role::Admin)
            .await?;

        let current = sqlx::query_as::<_, WorkspaceIntegration>(
            "SELECT id, workspace_id, provider, name, config, secret_ciphertext, enabled, \
             installed_by, last_used_at, created_at, updated_at FROM workspace_integration \
             WHERE id = $1 AND workspace_id = $2",
        )
        .bind(integration_id)
        .bind(workspace_id)
        .fetch_optional(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)?
        .ok_or(AppError::NotFound("integration not found".into()))?;

        let name = params
            .name
            .map(|n| n.trim().to_string())
            .unwrap_or(current.name);
        let enabled = params.enabled.unwrap_or(current.enabled);
        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::<_, WorkspaceIntegration>(
            "UPDATE workspace_integration SET name = $1, config = $2, secret_ciphertext = $3, \
             enabled = $4, updated_at = $5 WHERE id = $6 AND workspace_id = $7 \
             RETURNING id, workspace_id, provider, name, config, secret_ciphertext, enabled, \
             installed_by, last_used_at, created_at, updated_at",
        )
        .bind(&name)
        .bind(
            params
                .config
                .map(sqlx::types::Json)
                .or_else(|| current.config.clone()),
        )
        .bind(params.secret_ciphertext.or(current.secret_ciphertext))
        .bind(enabled)
        .bind(now)
        .bind(integration_id)
        .bind(workspace_id)
        .fetch_one(&mut *txn)
        .await
        .map_err(AppError::Database)?;

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

    pub async fn workspace_delete_integration(
        &self,
        ctx: &Session,
        workspace_id: Uuid,
        integration_id: Uuid,
    ) -> Result<(), AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let ws = self.find_workspace_by_id(workspace_id).await?;
        self.ensure_workspace_role_at_least(user_uid, &ws, crate::models::common::Role::Admin)
            .await?;

        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_integration WHERE id = $1 AND workspace_id = $2")
                .bind(integration_id)
                .bind(workspace_id)
                .execute(&mut *txn)
                .await
                .map_err(AppError::Database)?;
        ensure_affected(result.rows_affected(), "integration not found")?;

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