use crate::AppState;
use axum::{
    extract::{Query, State},
    http::StatusCode,
    response::IntoResponse,
    routing::{get, post},
    Json, Router,
};
use contracts::auth_middleware::AuthUser;
use db::models::{
    onboarding_state::OnboardingStateRepository,
    role::RoleRepository,
};
use serde::{Deserialize, Serialize};

// ── Routers ───────────────────────────────────────────────────────────────────

pub fn onboarding_router() -> Router<AppState> {
    Router::new()
        .route("/state",         get(get_state))
        .route("/save-progress", post(save_progress))
        .route("/submit",        post(submit))
}

pub fn me_router() -> Router<AppState> {
    Router::new()
        .route("/profile-status", get(profile_status))
}

// ── DTOs ──────────────────────────────────────────────────────────────────────

#[derive(Deserialize)]
pub struct RoleKeyQuery {
    #[serde(rename = "roleKey")]
    pub role_key: Option<String>,
}

// Accept role_key (string) so the frontend never has to know the internal UUID.
#[derive(Deserialize)]
pub struct SaveProgressInput {
    #[serde(rename = "roleKey", alias = "role_key")]
    pub role_key: String,
    pub progress_json: Option<serde_json::Value>,
}

#[derive(Deserialize)]
pub struct SubmitInput {
    #[serde(rename = "roleKey", alias = "role_key")]
    pub role_key: String,
    pub progress_json: Option<serde_json::Value>,
}

#[derive(Serialize)]
pub struct ProfileStatusResponse {
    pub onboarding_complete: bool,
    pub active_role: Option<String>,
    pub roles: Vec<String>,
    pub email_verified: bool,
}

// ── Handlers ──────────────────────────────────────────────────────────────────

/// GET /api/onboarding/state?roleKey=COMPANY
async fn get_state(
    auth: AuthUser,
    State(state): State<AppState>,
    Query(query): Query<RoleKeyQuery>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let role_key = query
        .role_key
        .filter(|k| !k.is_empty())
        .unwrap_or_else(|| auth.claims.active_role.clone());

    let role = RoleRepository::get_by_key(&state.pool, &role_key)
        .await
        .map_err(|_| (StatusCode::NOT_FOUND, format!("Role '{}' not found", role_key)))?;

    let onboarding_state =
        OnboardingStateRepository::get(&state.pool, auth.user_id, role.id)
            .await
            .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let response = match onboarding_state {
        Some(s) => serde_json::json!({
            "status": s.status,
            "currentStep": s.progress_json
                .get("step")
                .and_then(|v| v.as_i64())
                .unwrap_or(0),
            "progress": s.progress_json,
            "completed_at": s.completed_at,
            "role_key": role_key,
        }),
        None => serde_json::json!({
            "status": "NOT_STARTED",
            "currentStep": 0,
            "progress": null,
            "completed_at": null,
            "role_key": role_key,
        }),
    };

    Ok((StatusCode::OK, Json(response)))
}

/// POST /api/onboarding/save-progress
/// Body: { roleKey: "PHOTOGRAPHER", progress_json: { step: 2, total: 6, data: {...} } }
async fn save_progress(
    auth: AuthUser,
    State(state): State<AppState>,
    Json(input): Json<SaveProgressInput>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let role = RoleRepository::get_by_key(&state.pool, &input.role_key)
        .await
        .map_err(|_| (StatusCode::NOT_FOUND, format!("Role '{}' not found", input.role_key)))?;

    let progress = input.progress_json.unwrap_or(serde_json::Value::Object(Default::default()));

    let saved = OnboardingStateRepository::save_progress(
        &state.pool,
        auth.user_id,
        role.id,
        &progress,
    )
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    Ok((StatusCode::OK, Json(saved)))
}

/// POST /api/onboarding/submit
/// Body: { roleKey: "PHOTOGRAPHER", progress_json: { ...all form values... } }
async fn submit(
    auth: AuthUser,
    State(state): State<AppState>,
    Json(input): Json<SubmitInput>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let role = RoleRepository::get_by_key(&state.pool, &input.role_key)
        .await
        .map_err(|_| (StatusCode::NOT_FOUND, format!("Role '{}' not found", input.role_key)))?;

    let progress = input.progress_json.unwrap_or(serde_json::Value::Object(Default::default()));

    let completed = OnboardingStateRepository::complete(
        &state.pool,
        auth.user_id,
        role.id,
        &progress,
    )
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    Ok((StatusCode::OK, Json(completed)))
}

/// GET /api/me/profile-status
async fn profile_status(
    auth: AuthUser,
    State(state): State<AppState>,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    use db::models::user::UserRepository;

    let user = UserRepository::get_by_id(&state.pool, auth.user_id)
        .await
        .map_err(|_| (StatusCode::UNAUTHORIZED, "User not found".to_string()))?;

    let roles = UserRepository::get_user_role_keys(&state.pool, auth.user_id)
        .await
        .unwrap_or_default();

    let active_role = auth.claims.active_role.clone();
    let active_role_opt = if active_role.is_empty() { None } else { Some(active_role.clone()) };

    let onboarding_complete = if let Some(ref role_key) = active_role_opt {
        match RoleRepository::get_by_key(&state.pool, role_key).await {
            Ok(role) => OnboardingStateRepository::is_complete(&state.pool, auth.user_id, role.id)
                .await
                .unwrap_or(false),
            Err(_) => false,
        }
    } else {
        false
    };

    Ok((
        StatusCode::OK,
        Json(ProfileStatusResponse {
            onboarding_complete,
            active_role: active_role_opt,
            roles,
            email_verified: user.email_verified,
        }),
    ))
}