use serde_json::Value;
use uuid::Uuid;

pub fn build_quickwit_query(input: &str) -> Option<String> {
    let tokens: Vec<String> = input
        .split_whitespace()
        .filter(|token| !token.is_empty())
        .map(|token| {
            let normalized = token.to_lowercase();
            escape_quickwit_token(&normalized)
        })
        .collect();

    if tokens.is_empty() {
        return None;
    }

    let parts: Vec<String> = tokens
        .into_iter()
        .map(|token| format!("(title:{token} OR text:{token})"))
        .collect();

    Some(parts.join(" AND "))
}

pub fn escape_quickwit_token(token: &str) -> String {
    let mut escaped = String::with_capacity(token.len());
    for ch in token.chars() {
        match ch {
            '+' | '-' | '&' | '|' | '!' | '(' | ')' | '{' | '}' | '[' | ']' | '^' | '"' | '~'
            | '*' | '?' | ':' | '\\' | '/' => {
                escaped.push('\\');
                escaped.push(ch);
            }
            _ => escaped.push(ch),
        }
    }
    escaped
}

pub fn extract_document_id(hit: &Value) -> Option<Uuid> {
    for key in ["_source", "source", "fields", "stored_fields"] {
        if let Some(value) = hit.get(key) {
            if let Some(uuid) = extract_uuid_from_value(value) {
                return Some(uuid);
            }
        }
    }

    if let Some(value) = hit.get("document_id") {
        if let Some(uuid) = extract_uuid_from_value(value) {
            return Some(uuid);
        }
    }

    None
}

pub fn extract_uuid_from_value(value: &Value) -> Option<Uuid> {
    if let Some(obj) = value.as_object() {
        if let Some(inner) = obj.get("document_id") {
            return parse_uuid_value(inner);
        }
    }

    if let Some(arr) = value.as_array() {
        for item in arr {
            if let Some(uuid) = extract_uuid_from_value(item) {
                return Some(uuid);
            }
        }
    }

    parse_uuid_value(value)
}

pub fn parse_uuid_value(value: &Value) -> Option<Uuid> {
    if let Some(s) = value.as_str() {
        return Uuid::parse_str(s).ok();
    }

    if let Some(arr) = value.as_array() {
        for item in arr {
            if let Some(uuid) = parse_uuid_value(item) {
                return Some(uuid);
            }
        }
    }

    None
}