use crate::AppState;
use axum::{
    extract::{Path, Query, State},
    http::StatusCode,
    response::IntoResponse,
    routing::{get, patch},
    Json, Router,
};
use contracts::auth_middleware::AuthUser;
use serde::{Deserialize, Serialize};
use uuid::Uuid;

pub fn router() -> Router<AppState> {
    Router::new()
        .route("/", get(list_companies))
        .route("/{id}", get(get_company))
        .route("/{id}/approve", patch(approve_company))
        .route("/{id}/reject", patch(reject_company))
        .route("/{id}/suspend", patch(suspend_company))
}

#[derive(Deserialize)]
pub struct ListQuery {
    pub q: Option<String>,
}

#[derive(Serialize)]
pub struct AdminCompanyRow {
    pub id: Uuid,
    pub user_id: Uuid,
    pub company_name: String,
    pub registration_number: Option<String>,
    pub industry: Option<String>,
    pub status: String,
    pub created_at: chrono::DateTime<chrono::Utc>,
    pub updated_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Serialize)]
pub struct AdminCompanyDetail {
    pub id: Uuid,
    pub user_id: Uuid,
    pub company_name: String,
    pub registration_number: Option<String>,
    pub industry: Option<String>,
    pub website_url: Option<String>,
    pub employee_count: Option<i32>,
    pub business_type: Option<String>,
    pub gst_number: Option<String>,
    pub contact_name: Option<String>,
    pub contact_email: Option<String>,
    pub contact_phone: Option<String>,
    pub address_line1: Option<String>,
    pub city: Option<String>,
    pub state: Option<String>,
    pub country: String,
    pub postal_code: Option<String>,
    pub status: String,
    pub free_job_slots: i32,
    pub purchased_job_slots: i32,
    pub free_contact_views: i32,
    pub purchased_contact_views: i32,
    pub created_at: chrono::DateTime<chrono::Utc>,
    pub updated_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Deserialize)]
pub struct ApproveRejectRequest {
    pub reason: Option<String>,
}

async fn list_companies(
    _auth: AuthUser,
    State(state): State<AppState>,
    Query(q): Query<ListQuery>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let search = q.q.as_deref().unwrap_or_default().to_lowercase();
    
    let companies = sqlx::query_as!(
        AdminCompanyRow,
        r#"
            SELECT 
                id, user_id, company_name, registration_number, industry, 
                status, created_at, updated_at
            FROM company_profiles
            WHERE ($1 = '' OR LOWER(company_name) LIKE '%' || $1 || '%')
            ORDER BY created_at DESC
            LIMIT 100
        "#,
        search
    )
    .fetch_all(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    Ok(Json(companies))
}

async fn get_company(
    _auth: AuthUser,
    State(state): State<AppState>,
    Path(id): Path<Uuid>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let company = sqlx::query_as!(
        AdminCompanyDetail,
        r#"
            SELECT 
                id, user_id, company_name, registration_number, industry,
                website_url, employee_count, business_type, gst_number,
                contact_name, contact_email, contact_phone, address_line1,
                city, state, country, postal_code, status,
                free_job_slots, purchased_job_slots, free_contact_views, purchased_contact_views,
                created_at, updated_at
            FROM company_profiles
            WHERE id = $1
        "#,
        id
    )
    .fetch_optional(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    match company {
        Some(c) => Ok(Json(c)),
        None => Err((StatusCode::NOT_FOUND, "Company not found".to_string())),
    }
}

async fn approve_company(
    _auth: AuthUser,
    State(state): State<AppState>,
    Path(id): Path<Uuid>,
    Json(_payload): Json<ApproveRejectRequest>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let company = sqlx::query!(
        "SELECT id, user_id, status FROM company_profiles WHERE id = $1",
        id
    )
    .fetch_optional(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    let company = match company {
        Some(c) => c,
        None => return Err((StatusCode::NOT_FOUND, "Company not found".to_string())),
    };

    if company.status == "APPROVED" {
        return Err((StatusCode::BAD_REQUEST, "Company is already approved".to_string()));
    }

    sqlx::query!(
        "UPDATE company_profiles SET status = 'APPROVED', updated_at = NOW() WHERE id = $1",
        id
    )
    .execute(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    Ok(Json(serde_json::json!({
        "id": id,
        "status": "APPROVED",
        "message": "Company approved successfully"
    })))
}

async fn reject_company(
    _auth: AuthUser,
    State(state): State<AppState>,
    Path(id): Path<Uuid>,
    Json(payload): Json<ApproveRejectRequest>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let reason = payload.reason.as_deref().unwrap_or("No reason provided");

    let company = sqlx::query!(
        "SELECT id, user_id, status FROM company_profiles WHERE id = $1",
        id
    )
    .fetch_optional(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    let company = match company {
        Some(c) => c,
        None => return Err((StatusCode::NOT_FOUND, "Company not found".to_string())),
    };

    if company.status == "REJECTED" {
        return Err((StatusCode::BAD_REQUEST, "Company is already rejected".to_string()));
    }

    sqlx::query!(
        "UPDATE company_profiles SET status = 'REJECTED', updated_at = NOW() WHERE id = $1",
        id
    )
    .execute(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    Ok(Json(serde_json::json!({
        "id": id,
        "status": "REJECTED",
        "reason": reason,
        "message": "Company rejected"
    })))
}

async fn suspend_company(
    _auth: AuthUser,
    State(state): State<AppState>,
    Path(id): Path<Uuid>,
    Json(payload): Json<ApproveRejectRequest>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let reason = payload.reason.as_deref().unwrap_or("No reason provided");

    let company = sqlx::query!(
        "SELECT id, user_id, status FROM company_profiles WHERE id = $1",
        id
    )
    .fetch_optional(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    let company = match company {
        Some(c) => c,
        None => return Err((StatusCode::NOT_FOUND, "Company not found".to_string())),
    };

    if company.status == "SUSPENDED" {
        return Err((StatusCode::BAD_REQUEST, "Company is already suspended".to_string()));
    }

    sqlx::query!(
        "UPDATE company_profiles SET status = 'SUSPENDED', updated_at = NOW() WHERE id = $1",
        id
    )
    .execute(&state.pool)
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("DB error: {e}")))?;

    Ok(Json(serde_json::json!({
        "id": id,
        "status": "SUSPENDED",
        "reason": reason,
        "message": "Company suspended"
    })))
}