use crate::api::read_after_write::{
    FeedOutput, FeedViewPost, ProfileRecord, RecordDescript, extract_repo_rev, format_local_post,
    format_munged_response, get_local_lag, get_records_since_rev, insert_posts_into_feed,
    proxy_to_appview,
};
use crate::state::AppState;
use axum::{
    Json,
    extract::{Query, State},
    http::StatusCode,
    response::{IntoResponse, Response},
};
use serde::Deserialize;
use std::collections::HashMap;
use tracing::warn;

#[derive(Deserialize)]
pub struct GetAuthorFeedParams {
    pub actor: String,
    pub limit: Option<u32>,
    pub cursor: Option<String>,
    pub filter: Option<String>,
    #[serde(rename = "includePins")]
    pub include_pins: Option<bool>,
}

fn update_author_profile_in_feed(
    feed: &mut [FeedViewPost],
    author_did: &str,
    local_profile: &RecordDescript<ProfileRecord>,
) {
    for item in feed.iter_mut() {
        if item.post.author.did == author_did
            && let Some(ref display_name) = local_profile.record.display_name {
                item.post.author.display_name = Some(display_name.clone());
            }
    }
}

pub async fn get_author_feed(
    State(state): State<AppState>,
    headers: axum::http::HeaderMap,
    Query(params): Query<GetAuthorFeedParams>,
) -> Response {
    let auth_header = headers.get("Authorization").and_then(|h| h.to_str().ok());
    let auth_user = if let Some(h) = auth_header {
        if let Some(token) = crate::auth::extract_bearer_token_from_header(Some(h)) {
            crate::auth::validate_bearer_token(&state.db, &token)
                .await
                .ok()
        } else {
            None
        }
    } else {
        None
    };
    let auth_did = auth_user.as_ref().map(|u| u.did.clone());
    let auth_key_bytes = auth_user.as_ref().and_then(|u| u.key_bytes.clone());
    let mut query_params = HashMap::new();
    query_params.insert("actor".to_string(), params.actor.clone());
    if let Some(limit) = params.limit {
        query_params.insert("limit".to_string(), limit.to_string());
    }
    if let Some(cursor) = &params.cursor {
        query_params.insert("cursor".to_string(), cursor.clone());
    }
    if let Some(filter) = &params.filter {
        query_params.insert("filter".to_string(), filter.clone());
    }
    if let Some(include_pins) = params.include_pins {
        query_params.insert("includePins".to_string(), include_pins.to_string());
    }
    let proxy_result = match proxy_to_appview(
        "app.bsky.feed.getAuthorFeed",
        &query_params,
        auth_did.as_deref().unwrap_or(""),
        auth_key_bytes.as_deref(),
    )
    .await
    {
        Ok(r) => r,
        Err(e) => return e,
    };
    if !proxy_result.status.is_success() {
        return proxy_result.into_response();
    }
    let rev = match extract_repo_rev(&proxy_result.headers) {
        Some(r) => r,
        None => return proxy_result.into_response(),
    };
    let mut feed_output: FeedOutput = match serde_json::from_slice(&proxy_result.body) {
        Ok(f) => f,
        Err(e) => {
            warn!("Failed to parse author feed response: {:?}", e);
            return proxy_result.into_response();
        }
    };
    let requester_did = match &auth_did {
        Some(d) => d.clone(),
        None => return (StatusCode::OK, Json(feed_output)).into_response(),
    };
    let actor_did = if params.actor.starts_with("did:") {
        params.actor.clone()
    } else {
        let hostname = std::env::var("PDS_HOSTNAME").unwrap_or_else(|_| "localhost".to_string());
        let suffix = format!(".{}", hostname);
        let short_handle = if params.actor.ends_with(&suffix) {
            params.actor.strip_suffix(&suffix).unwrap_or(&params.actor)
        } else {
            &params.actor
        };
        match sqlx::query_scalar!("SELECT did FROM users WHERE handle = $1", short_handle)
            .fetch_optional(&state.db)
            .await
        {
            Ok(Some(did)) => did,
            Ok(None) => return (StatusCode::OK, Json(feed_output)).into_response(),
            Err(e) => {
                warn!("Database error resolving actor handle: {:?}", e);
                return proxy_result.into_response();
            }
        }
    };
    if actor_did != requester_did {
        return (StatusCode::OK, Json(feed_output)).into_response();
    }
    let local_records = match get_records_since_rev(&state, &requester_did, &rev).await {
        Ok(r) => r,
        Err(e) => {
            warn!("Failed to get local records: {}", e);
            return proxy_result.into_response();
        }
    };
    if local_records.count == 0 {
        return (StatusCode::OK, Json(feed_output)).into_response();
    }
    let handle = match sqlx::query_scalar!("SELECT handle FROM users WHERE did = $1", requester_did)
        .fetch_optional(&state.db)
        .await
    {
        Ok(Some(h)) => h,
        Ok(None) => requester_did.clone(),
        Err(e) => {
            warn!("Database error fetching handle: {:?}", e);
            requester_did.clone()
        }
    };
    if let Some(ref local_profile) = local_records.profile {
        update_author_profile_in_feed(&mut feed_output.feed, &requester_did, local_profile);
    }
    let local_posts: Vec<_> = local_records
        .posts
        .iter()
        .map(|p| format_local_post(p, &requester_did, &handle, local_records.profile.as_ref()))
        .collect();
    insert_posts_into_feed(&mut feed_output.feed, local_posts);
    let lag = get_local_lag(&local_records);
    format_munged_response(feed_output, lag)
}