use axum::{
    extract::{FromRef, Path, State},
    http::{
        header::{ACCEPT, CONTENT_TYPE},
        HeaderMap, HeaderValue, StatusCode,
    },
    response::{Html, IntoResponse, Redirect},
    Form, Json,
};
use maud::{html, Render};
use serde::{Deserialize, Serialize};
use sqlx::{Pool, Postgres};
use tracing::error;
use uuid::Uuid;

use crate::{
    markup_response::{simple_error_page, MarkupResponse},
    model::{Chat, Message},
    state::AppState,
    ADMIN_TOK,
};

pub async fn get(
    Path(url_path): Path<String>,
    headers: HeaderMap,
    State(state): State<AppState>,
) -> impl IntoResponse {
    println!("headers: {headers:#?}");
    // TODO: Error handling
    let chat = match state.fetch_chat_by_url_path(&url_path).await {
        Ok(v) => v,
        Err(err) => {
            error!("Error fetching chat: {err:?}");
            return simple_error_page(err.into()).into_response();
        }
    };
    let messages = match state.fetch_messages(&chat).await {
        Ok(v) => v,
        Err(err) => {
            error!("Error fetching messages for chat {}: {err:?}", chat.id);
            return simple_error_page(err.into()).into_response();
        }
    };

    if Some(&HeaderValue::from_static("application/json")) == headers.get(ACCEPT) {
        Json(messages).into_response()
    } else {
        MarkupResponse::new(
            html! {
                template #chatmessage {
                    div.message {
                        p { }
                        span.timestamp { }
                    }
                }
                main {
                    div #history {
                        @for msg in &messages {
                            div.message.(if msg.from_admin { "from_admin" } else { "from_user" }) #(msg.id) {
                                p { (msg.content) } 
                                span.timestamp { (msg.timestamp) }
                            }
                        }
                    }
                    form #send method="post"{
                        textarea #msgcontent name="msgcontent" rows="1" cols="80" {}
                        button type="submit" { "Send!" }
                    }
                }
                script src="/static/chat.js" {};

            },
            "Cursed Messenger from hell",
        )
        .into_response()
    }
}

pub async fn poll(Path(message): Path<Uuid>, State(state): State<AppState>) -> impl IntoResponse {
    let message = sqlx::query_as!(Message, r#"select * from messages where id = $1"#, message)
        .fetch_one(state.pool())
        .await
        .unwrap();

    let new_messages = sqlx::query_as!(
        Message,
        r#"select * from messages where chat_id = $1 and timestamp > $2;"#,
        message.chat_id,
        message.timestamp
    )
    .fetch_all(state.pool())
    .await
    .unwrap();

    Json(new_messages)
}

// TODO:
// - validation of msg length
// - fix terrible returns lmao
pub async fn post(
    Path(url_path): Path<String>,
    headers: HeaderMap,
    State(state): State<AppState>,
    Form(FormMessageBody { msgcontent: body }): Form<FormMessageBody>,
) -> impl IntoResponse {
    let chat = sqlx::query_as!(Chat, r#"select * from chats where url_path = $1"#, url_path)
        .fetch_one(state.pool())
        .await
        .unwrap();

    if body.len() > 2000 {
        return StatusCode::BAD_REQUEST.into_response();
    }

    if headers.get("x-admin-tok") == Some(&HeaderValue::from_static(ADMIN_TOK)) {
        sqlx::query!(
            r#"insert into messages (chat_id, content, from_admin) values ($1, $2, true);"#,
            chat.id,
            body
        )
        .execute(state.pool())
        .await
        .unwrap();
        StatusCode::OK.into_response()
    } else {
        sqlx::query!(
            r#"insert into messages (chat_id, content, from_admin) values ($1, $2, false);"#,
            chat.id,
            body
        )
        .execute(state.pool())
        .await
        .unwrap();
        Redirect::to(&format!("/{url_path}")).into_response()
    }
}

#[derive(Debug, Serialize, Deserialize)]
pub struct FormMessageBody {
    msgcontent: String,
}