use axum::{
    extract::Query,
    http::StatusCode,
    response::{IntoResponse, Json},
};

#[derive(Debug, serde::Deserialize)]
pub struct EditConfigQuery {
    pub key: String,
    pub value: String,
}

pub async fn get_config_handler() -> impl IntoResponse {
    let config_path = std::path::Path::new("config/markbase.toml");

    // Return defaults if config file doesn't exist yet (loadSettings in admin UI needs it)
    if !config_path.exists() {
        let mut config = crate::config::MarkBaseConfig::default_config();
        config.merge_env();
        return (
            StatusCode::OK,
            Json(serde_json::to_value(&config).unwrap_or_default()),
        )
            .into_response();
    }

    match crate::config::MarkBaseConfig::load(config_path) {
        Ok(config) => (
            StatusCode::OK,
            Json(serde_json::to_value(&config).unwrap_or_default()),
        )
            .into_response(),
        Err(e) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"error": e.to_string()})),
        )
            .into_response(),
    }
}

pub async fn edit_config_handler(Query(params): Query<EditConfigQuery>) -> impl IntoResponse {
    let config_path = std::path::Path::new("config/markbase.toml");

    // Load existing or use defaults, so admin can save settings without a pre-existing file
    let mut config = if config_path.exists() {
        match crate::config::MarkBaseConfig::load(config_path) {
            Ok(c) => c,
            Err(e) => {
                return (StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({"error": e.to_string()}))).into_response();
            }
        }
    } else {
        let mut defaults = crate::config::MarkBaseConfig::default_config();
        defaults.merge_env();
        defaults
    };

    let old_value = config.get(&params.key).unwrap_or_default();

    match config.set(&params.key, &params.value) {
        Ok(_) => match config.validate() {
            Ok(_) => match config.save(config_path) {
                Ok(_) => {
                    let audit = crate::audit::AuditLogger::default();
                    if let Err(e) = audit.log_config_change(
                        "markbase",
                        &params.key,
                        &old_value,
                        &params.value,
                        "system",
                        None,
                    ) {
                        log::warn!("Failed to write audit log: {}", e);
                    }

                    (StatusCode::OK, Json(serde_json::json!({"ok": true}))).into_response()
                }
                Err(e) => (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({"error": e.to_string()})),
                )
                    .into_response(),
            },
            Err(e) => (
                StatusCode::BAD_REQUEST,
                Json(serde_json::json!({"error": e.to_string()})),
            )
                .into_response(),
        },
        Err(e) => (
            StatusCode::BAD_REQUEST,
            Json(serde_json::json!({"error": e.to_string()})),
        )
            .into_response(),
    }
}

pub async fn validate_config_handler() -> impl IntoResponse {
    let config_path = std::path::Path::new("config/markbase.toml");

    if !config_path.exists() {
        return (
            StatusCode::NOT_FOUND,
            Json(serde_json::json!({"ok": false, "error": "Config file not found"})),
        )
            .into_response();
    }

    match crate::config::MarkBaseConfig::load(config_path) {
        Ok(config) => match config.validate() {
            Ok(_) => (StatusCode::OK, Json(serde_json::json!({"ok": true}))).into_response(),
            Err(e) => (
                StatusCode::BAD_REQUEST,
                Json(serde_json::json!({"ok": false, "error": e.to_string()})),
            )
                .into_response(),
        },
        Err(e) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"ok": false, "error": e.to_string()})),
        )
            .into_response(),
    }
}

pub async fn get_s3_config_handler() -> impl IntoResponse {
    match crate::s3_config::S3Config::load_default() {
        Ok(config) => (
            StatusCode::OK,
            Json(serde_json::to_value(&config).unwrap_or_default()),
        )
            .into_response(),
        Err(e) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"error": e.to_string()})),
        )
            .into_response(),
    }
}

pub async fn edit_s3_config_handler(Query(params): Query<EditConfigQuery>) -> impl IntoResponse {
    match crate::s3_config::S3Config::load_default() {
        Ok(mut config) => {
            let old_value = config.get(&params.key).unwrap_or_default();

            match config.set(&params.key, &params.value) {
                Ok(_) => match config.validate() {
                    Ok(_) => match config.save("config/s3.toml") {
                        Ok(_) => {
                            let audit = crate::audit::AuditLogger::default();
                            if let Err(e) = audit.log_config_change(
                                "s3",
                                &params.key,
                                &old_value,
                                &params.value,
                                "system",
                                None,
                            ) {
                                log::warn!("Failed to write audit log: {}", e);
                            }

                            (StatusCode::OK, Json(serde_json::json!({"ok": true}))).into_response()
                        }
                        Err(e) => (
                            StatusCode::INTERNAL_SERVER_ERROR,
                            Json(serde_json::json!({"error": e.to_string()})),
                        )
                            .into_response(),
                    },
                    Err(e) => (
                        StatusCode::BAD_REQUEST,
                        Json(serde_json::json!({"error": e.to_string()})),
                    )
                        .into_response(),
                },
                Err(e) => (
                    StatusCode::BAD_REQUEST,
                    Json(serde_json::json!({"error": e.to_string()})),
                )
                    .into_response(),
            }
        }
        Err(e) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"error": e.to_string()})),
        )
            .into_response(),
    }
}

pub async fn validate_s3_config_handler() -> impl IntoResponse {
    match crate::s3_config::S3Config::load_default() {
        Ok(config) => match config.validate() {
            Ok(_) => (StatusCode::OK, Json(serde_json::json!({"ok": true}))).into_response(),
            Err(e) => (
                StatusCode::BAD_REQUEST,
                Json(serde_json::json!({"ok": false, "error": e.to_string()})),
            )
                .into_response(),
        },
        Err(e) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"ok": false, "error": e.to_string()})),
        )
            .into_response(),
    }
}