use axum::{extract::Path, http::StatusCode, response::Redirect, Form};
use axum_login::AuthSession;

use crate::{
    handler::internal_error,
    models::{
        documents::{self, NewDocument},
        users::User,
    },
    permissions::{self, query::Permission},
    prelude::*,
};

pub async fn documents_page(
    State(ctx): State<Context>,
    auth_session: AuthSession<Context>,
) -> Result<Response, (StatusCode, String)> {
    if let Some(user) = auth_session.user {
        render_documents_page(ctx, user).await
    } else {
        Ok(Redirect::to("/login").into_response())
    }
}

async fn render_documents_page(ctx: Context, user: User) -> Result<Response, (StatusCode, String)> {
    let mut db = ctx.db_pool.get().map_err(internal_error)?;
    let documents =
        permissions::query::accessible_documents(&mut db, &user.id).map_err(internal_error)?;
    let projects =
        permissions::query::accessible_projects(&mut db, &user.id).map_err(internal_error)?;

    let values = context! {
        user => user,
        documents => documents,
        projects => projects,
    };

    Ok(ctx.render_resp("documents/list_documents.html", values))
}

pub async fn create_document_page(
    State(ctx): State<Context>,
    auth_session: AuthSession<Context>,
) -> Result<Response, (StatusCode, String)> {
    let user = match auth_session.user {
        Some(user) => user,
        None => return Ok(Redirect::to("/login").into_response()),
    };

    let mut db = ctx.db_pool.get().map_err(internal_error)?;

    let projects =
        permissions::query::accessible_projects(&mut db, &user.id).map_err(internal_error)?;

    let values = context! {
        user => user,
        projects => projects,
    };
    Ok(ctx.render_resp("documents/create_document.html", values))
}

#[derive(Debug, Deserialize)]
pub struct CreateDocumentSubmission {
    pub project_id: Uuid,
    pub title: String,
}

pub async fn create_document_submit(
    State(ctx): State<Context>,
    auth_session: AuthSession<Context>,
    form: Form<CreateDocumentSubmission>,
) -> Result<Response, (StatusCode, String)> {
    let user = match auth_session.user {
        Some(user) => user,
        None => return Ok(Redirect::to("/login").into_response()),
    };
    let mut db = ctx.db_pool.get().map_err(internal_error)?;

    let project_allowed = permissions::query::check_user_project(
        &mut db,
        &user.id,
        &form.project_id.to_string(),
        Permission::Write,
    )
    .map_err(internal_error)?;

    if !project_allowed {
        return Err((StatusCode::FORBIDDEN, "permission denied".to_owned()));
    }

    let new_document = NewDocument::new(
        &user.id,
        &form.project_id.to_string(),
        form.title.to_owned(),
        "".to_owned(),
    );

    let document = documents::query::create(&mut db, new_document).map_err(internal_error)?;
    info!(?document, "document created");

    Ok(Redirect::to("/documents").into_response())
}

pub async fn edit_document_page(
    State(ctx): State<Context>,
    auth_session: AuthSession<Context>,
    Path((id,)): Path<(Uuid,)>,
) -> Result<Response, (StatusCode, String)> {
    let user = match auth_session.user {
        Some(user) => user,
        None => return Ok(Redirect::to("/login").into_response()),
    };

    let mut db = ctx.db_pool.get().map_err(internal_error)?;

    let document_allowed = permissions::query::check_user_document(
        &mut db,
        &user.id,
        &id.to_string(),
        Permission::Write,
    )
    .map_err(internal_error)?;

    if !document_allowed {
        return Err((StatusCode::FORBIDDEN, "permission denied".to_owned()));
    }

    let document = documents::query::by_id(&mut db, &id.to_string()).map_err(internal_error)?;
    let projects =
        permissions::query::accessible_projects(&mut db, &user.id).map_err(internal_error)?;

    let values = context! {
        user => user,
        document => document,
        projects => projects,
    };

    Ok(ctx.render_resp("documents/edit_document.html", values))
}

#[derive(Debug, Deserialize)]
pub struct EditDocumentSubmission {
    pub title: String,
    pub content: String,
}

pub async fn edit_document_submit(
    State(ctx): State<Context>,
    auth_session: AuthSession<Context>,
    Path((document_id,)): Path<(Uuid,)>,
    form: Form<EditDocumentSubmission>,
) -> Result<Response, (StatusCode, String)> {
    let user = match auth_session.user {
        Some(user) => user,
        None => return Ok(Redirect::to("/login").into_response()),
    };

    let mut db = ctx.db_pool.get().map_err(internal_error)?;

    let document_allowed = permissions::query::check_user_document(
        &mut db,
        &user.id,
        &document_id.to_string(),
        Permission::Write,
    )
    .map_err(internal_error)?;

    if !document_allowed {
        return Err((StatusCode::FORBIDDEN, "permission denied".to_owned()));
    }

    documents::query::update(
        &mut db,
        &document_id.to_string(),
        form.title.to_owned(),
        form.content.to_owned(),
    )
    .map_err(internal_error)?;

    Ok(Redirect::to("/documents").into_response())
}