use askama_axum::{IntoResponse, Response, Template};
use axum::{extract::{Path, State}, response::Redirect, Extension, Form};
use axum_extra::response::Html;
use chrono::Utc;
use http::StatusCode;
use serde::Deserialize;
use sqlx::{SqlitePool, Row};

use crate::{middlewares::is_authorized, user::{get_user_roles_display, get_user_wishlist_items, UserData, UserWishlistItem}};

struct HtmlTemplate<T>(T);

impl<T> IntoResponse for HtmlTemplate<T>
where
    T: Template,
{
    fn into_response(self) -> Response {
        match self.0.render() {
            Ok(html) => Html(html).into_response(),
            Err(err) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("Failed to render template. Error: {}", err),
            )
                .into_response(),
        }
    }
}

#[derive(Template)]
#[template(path = "userwishlists.html")]
struct WishListsTemplate {
    logged_in: bool,
    name: String,
    user_roles: Vec<crate::user::UserRolesDisplay>,
    users: Vec<UserData>,
}

pub async fn wishlists(
    Extension(user_data): Extension<Option<UserData>>,
    State(db_pool): State<SqlitePool>,
) -> impl IntoResponse {
    let user_name = user_data.as_ref().map(|s| s.name.clone());
    let logged_in = user_name.is_some();
    let name = user_name.unwrap_or_default();

    let users = sqlx::query_as::<_, UserData>("SELECT * FROM users")
        .fetch_all(&db_pool)
        .await
        .unwrap();

        let userid = user_data.as_ref().map(|s| s.id.clone()).unwrap_or_default();

        if is_authorized("/userwishlists", user_data, db_pool.clone()).await {
            // Get user roles
            let user_roles = get_user_roles_display(userid, &db_pool.clone()).await;

            let template = WishListsTemplate {
                logged_in,
                name,
                users,
                user_roles,
        };
        HtmlTemplate(template).into_response()
    } else {
        Redirect::to("/").into_response()
    }
}

#[derive(Template)]
#[template(path = "userwishlist.html")]
struct UserWishListTemplate {
    logged_in: bool,
    name: String,
    my_wishlist: bool,
    user: UserData,
    user_roles: Vec<crate::user::UserRolesDisplay>,
    user_wishlist_items: Vec<crate::user::UserWishlistItem>,
}

pub async fn user_wishlist(
    Path(user_id): Path<i64>,
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>,
) -> impl IntoResponse {
    // Extract the user's name from the user data.
    let user_name = user_data.as_ref().map(|s| s.name.clone());
    let logged_in = user_data.is_some();
    let name = user_name.unwrap_or_default();

    // Extract the user's id from the user data
    let user_userid = user_data.as_ref().map(|s| s.id.clone());
    let userid = user_userid.unwrap_or_default();

    // Extract the user data.
    let user = sqlx::query_as!(UserData, "SELECT * FROM users WHERE id = ?", user_id)
        .fetch_one(&db_pool)
        .await
        .unwrap();

        if is_authorized("/wishlist", user_data, db_pool.clone()).await {
            // Get user roles
            let user_roles = get_user_roles_display(userid, &db_pool.clone()).await;

            // Get user wishlist
        let user_wishlist_items = get_user_wishlist_items(user_id, &db_pool.clone()).await;

        // Is viewed and viewing user the same (my wishlist)?
        let my_wishlist = user_id == userid;

        // Create the wishlist template.
        let template = UserWishListTemplate {
            logged_in,
            name,
            my_wishlist,
            user: user,
            user_roles,
            user_wishlist_items,
        };
        return HtmlTemplate(template).into_response();
    } else {
        Redirect::to("/").into_response()
    }
}

#[derive(Template)]
#[template(path = "userwishlistadd.html")]
struct UserWishListAddTemplate {
    logged_in: bool,
    name: String,
    user: UserData,
    user_roles: Vec<crate::user::UserRolesDisplay>,
    user_wishlist_items: Vec<crate::user::UserWishlistItem>,
}

pub async fn user_wishlist_add(
    Path(user_id): Path<i64>,
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>,
) -> impl IntoResponse {
    // Extract the user's name from the user data.
    let user_name = user_data.as_ref().map(|s| s.name.clone());
    let logged_in = user_data.is_some();
    let name = user_name.unwrap_or_default();

    // Extract the user data.
    let user = sqlx::query_as!(UserData, "SELECT * FROM users WHERE id = ?", user_id)
        .fetch_one(&db_pool)
        .await
        .unwrap();

    let userid = user_data.as_ref().map(|s| s.id.clone()).unwrap_or_default();

    if is_authorized("/wishlist", user_data, db_pool.clone()).await {
            // Get user roles
            let user_roles = get_user_roles_display(userid, &db_pool.clone()).await;

            // Get user wishlist items
        let user_wishlist_items = get_user_wishlist_items(user_id, &db_pool.clone()).await;

        // Create the wishlist template.
        let template = UserWishListAddTemplate {
            logged_in,
            name,
            user: user,
            user_roles,
            user_wishlist_items,
        };
        return HtmlTemplate(template).into_response();
    } else {
        Redirect::to("/").into_response()
    }
}

#[derive(Deserialize, Debug)]
pub struct ItemForm {
    item: String,
    item_url: String,
}

pub async fn user_wishlist_add_item(
    Path(user_id): Path<i64>,
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>,
    Form(item_form): Form<ItemForm>
) -> impl IntoResponse {
    if is_authorized("/wishlist", user_data.clone(), db_pool.clone()).await {
        // Insert new item to database
        let now = Utc::now().timestamp();

        sqlx::query("insert into wishlist_items (created_at, created_by, updated_at, updated_by, user_id, item, item_url) values (?, ?, ?, ?, ?, ?, ?)")
            .bind(now)// Created now
            .bind(user_data.as_ref().unwrap().id)// Created by current user
            .bind(now) // Updated now
            .bind(user_data.as_ref().unwrap().id) // Updated by current user
            .bind(user_id)
            .bind(item_form.item)
            .bind(item_form.item_url)
            .execute(&db_pool)
            .await
            .unwrap();

        let redirect_string = format!("/userwishlist/{user_id}");
        Redirect::to(&redirect_string).into_response()
    } else {
        Redirect::to("/").into_response()
    }
}

pub async fn user_wishlist_bought_item(
    Path(user_id): Path<i64>,
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>
) -> impl IntoResponse {
    if is_authorized("/wishlist", user_data.clone(), db_pool.clone()).await {
        // Update item to purchased
        sqlx::query("update wishlist_items set purchased_by = ? where id = ?")
            .bind(user_data.as_ref().unwrap().id)// Created by current user
            .bind(user_id)
            .execute(&db_pool)
            .await
            .unwrap();

        // Redirect to user wishlist
        // Extract the user data.
        let row = sqlx::query( "SELECT user_id FROM wishlist_items WHERE id = ?")
            .bind(user_id)
            .fetch_one(&db_pool)
            .await
            .unwrap();

        let userid = row.get::<i64, _>("user_id");
        let redirect_string = format!("/userwishlist/{userid}");
        Redirect::to(&redirect_string).into_response()
    } else {
        Redirect::to("/").into_response()
    }
}

pub async fn user_wishlist_received_item(
    Path(user_id): Path<i64>,
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>
) -> impl IntoResponse {
    if is_authorized("/wishlist", user_data.clone(), db_pool.clone()).await {
        // Update item received time
        let now = Utc::now().timestamp();

        sqlx::query("update wishlist_items set received_at = ? where id = ?")
            .bind(now)// Received now
            .bind(user_id)
            .execute(&db_pool)
            .await
            .unwrap();

        // Redirect to user wishlist
        let userid = user_data.as_ref().unwrap().id;
        let redirect_string = format!("/userwishlist/{userid}");
        Redirect::to(&redirect_string).into_response()
    } else {
        Redirect::to("/").into_response()
    }
}