use std::sync::Arc;

use axum::extract::State;
use axum::http::{HeaderMap, StatusCode, header};
use axum::response::IntoResponse;
use axum::Json;
use noisebell_common::{validate_bearer, HistoryEntry, WebhookPayload};
use tokio::sync::Mutex;
use tracing::{error, info};

use crate::db;
use crate::types::{DoorStatus, WebhookTarget};
use crate::webhook;

static OPEN_PNG: &[u8] = include_bytes!("../assets/open.png");
static CLOSED_PNG: &[u8] = include_bytes!("../assets/closed.png");
static OFFLINE_PNG: &[u8] = include_bytes!("../assets/offline.png");

pub struct AppState {
    pub db: Arc<Mutex<rusqlite::Connection>>,
    pub client: reqwest::Client,
    pub inbound_api_key: String,
    pub webhooks: Vec<WebhookTarget>,
    pub retry_attempts: u32,
    pub retry_base_delay_secs: u64,
}

fn unix_now() -> u64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap()
        .as_secs()
}

pub async fn post_webhook(
    State(state): State<Arc<AppState>>,
    headers: HeaderMap,
    Json(body): Json<WebhookPayload>,
) -> StatusCode {
    if !validate_bearer(&headers, &state.inbound_api_key) {
        return StatusCode::UNAUTHORIZED;
    }

    let Some(status) = DoorStatus::from_str(&body.status) else {
        return StatusCode::BAD_REQUEST;
    };

    let now = unix_now();
    let db = state.db.clone();
    let timestamp = body.timestamp;
    let result = tokio::task::spawn_blocking(move || {
        let conn = db.blocking_lock();
        db::update_state(&conn, status, timestamp, now)
    })
    .await
    .expect("db task panicked");

    if let Err(e) = result {
        error!(error = %e, "failed to update state from webhook");
        return StatusCode::INTERNAL_SERVER_ERROR;
    }

    info!(status = status.as_str(), timestamp = body.timestamp, "state updated via webhook");

    webhook::forward(
        &state.client,
        &state.webhooks,
        &WebhookPayload {
            status: status.as_str().to_string(),
            timestamp: body.timestamp,
        },
        state.retry_attempts,
        state.retry_base_delay_secs,
    )
    .await;

    StatusCode::OK
}

pub async fn get_status(State(state): State<Arc<AppState>>) -> Result<Json<serde_json::Value>, StatusCode> {
    let db = state.db.clone();
    let status = tokio::task::spawn_blocking(move || {
        let conn = db.blocking_lock();
        db::get_status(&conn)
    })
    .await
    .expect("db task panicked")
    .map_err(|e| {
        error!(error = %e, "failed to get status");
        StatusCode::INTERNAL_SERVER_ERROR
    })?;

    Ok(Json(serde_json::to_value(status).unwrap()))
}

pub async fn get_info(State(state): State<Arc<AppState>>) -> Result<Json<serde_json::Value>, StatusCode> {
    let db = state.db.clone();
    let info = tokio::task::spawn_blocking(move || {
        let conn = db.blocking_lock();
        db::get_pi_info(&conn)
    })
    .await
    .expect("db task panicked")
    .map_err(|e| {
        error!(error = %e, "failed to get pi info");
        StatusCode::INTERNAL_SERVER_ERROR
    })?;

    Ok(Json(info))
}

pub async fn health() -> StatusCode {
    StatusCode::OK
}

pub async fn get_history(
    State(state): State<Arc<AppState>>,
) -> Result<Json<Vec<HistoryEntry>>, StatusCode> {
    let limit = 100u32;
    let db = state.db.clone();
    let entries = tokio::task::spawn_blocking(move || {
        let conn = db.blocking_lock();
        db::get_history(&conn, limit)
    })
    .await
    .expect("db task panicked")
    .map_err(|e| {
        error!(error = %e, "failed to get history");
        StatusCode::INTERNAL_SERVER_ERROR
    })?;

    Ok(Json(entries))
}

pub async fn get_image_open() -> impl IntoResponse {
    ([(header::CONTENT_TYPE, "image/png"), (header::CACHE_CONTROL, "public, max-age=86400")], OPEN_PNG)
}

pub async fn get_image_closed() -> impl IntoResponse {
    ([(header::CONTENT_TYPE, "image/png"), (header::CACHE_CONTROL, "public, max-age=86400")], CLOSED_PNG)
}

pub async fn get_image_offline() -> impl IntoResponse {
    ([(header::CONTENT_TYPE, "image/png"), (header::CACHE_CONTROL, "public, max-age=86400")], OFFLINE_PNG)
}

pub async fn get_image(State(state): State<Arc<AppState>>) -> impl IntoResponse {
    let db = state.db.clone();
    let status = tokio::task::spawn_blocking(move || {
        let conn = db.blocking_lock();
        db::get_current_status_str(&conn)
    })
    .await
    .expect("db task panicked")
    .ok()
    .flatten();

    let image = match status.as_deref() {
        Some("open") => OPEN_PNG,
        Some("closed") => CLOSED_PNG,
        _ => OFFLINE_PNG,
    };
    ([(header::CONTENT_TYPE, "image/png"), (header::CACHE_CONTROL, "public, max-age=5")], image)
}

pub async fn get_badge(State(state): State<Arc<AppState>>) -> impl IntoResponse {
    let db = state.db.clone();
    let status = tokio::task::spawn_blocking(move || {
        let conn = db.blocking_lock();
        db::get_current_status_str(&conn)
    })
    .await
    .expect("db task panicked")
    .ok()
    .flatten();

    let (label, color) = match status.as_deref() {
        Some("open") => ("open", "#57f287"),
        Some("closed") => ("closed", "#ed4245"),
        _ => ("offline", "#99aab5"),
    };

    let label_width = 70u32;
    let value_width = 10 + label.len() as u32 * 7;
    let total_width = label_width + value_width;
    let label_x = label_width as f32 / 2.0;
    let value_x = label_width as f32 + value_width as f32 / 2.0;

    let svg = format!(
        "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"{total_width}\" height=\"20\">\
        <linearGradient id=\"s\" x2=\"0\" y2=\"100%\">\
        <stop offset=\"0\" stop-color=\"#bbb\" stop-opacity=\".1\"/>\
        <stop offset=\"1\" stop-opacity=\".1\"/>\
        </linearGradient>\
        <clipPath id=\"r\"><rect width=\"{total_width}\" height=\"20\" rx=\"3\" fill=\"#fff\"/></clipPath>\
        <g clip-path=\"url(#r)\">\
        <rect width=\"{label_width}\" height=\"20\" fill=\"#555\"/>\
        <rect x=\"{label_width}\" width=\"{value_width}\" height=\"20\" fill=\"{color}\"/>\
        <rect width=\"{total_width}\" height=\"20\" fill=\"url(#s)\"/>\
        </g>\
        <g fill=\"#fff\" text-anchor=\"middle\" font-family=\"Verdana,Geneva,sans-serif\" font-size=\"11\">\
        <text x=\"{label_x}\" y=\"15\" fill=\"#010101\" fill-opacity=\".3\">noisebell</text>\
        <text x=\"{label_x}\" y=\"14\">noisebell</text>\
        <text x=\"{value_x}\" y=\"15\" fill=\"#010101\" fill-opacity=\".3\">{label}</text>\
        <text x=\"{value_x}\" y=\"14\">{label}</text>\
        </g></svg>"
    );

    (
        [
            (header::CONTENT_TYPE, "image/svg+xml"),
            (header::CACHE_CONTROL, "no-cache, max-age=0"),
        ],
        svg,
    )
}