use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::model::ScanMode;

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum ValueType {
    Null,
    Bool,
    Int,
    UInt,
    Float,
    Text,
    Bytes,
    Array,
    Object,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum PointQuality {
    Good,
    Bad,
    Uncertain,
    Unknown,
}

impl PointQuality {
    pub fn from_status_code(status: &opcua::types::StatusCode) -> Self {
        if status.is_good() {
            Self::Good
        } else if status.is_bad() {
            Self::Bad
        } else if status.is_uncertain() {
            Self::Uncertain
        } else {
            Self::Unknown
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(untagged)]
pub enum DataValue {
    Null,
    Bool(bool),
    Int(i64),
    UInt(u64),
    Float(f64),
    Text(String),
    Bytes(Vec<u8>),
    Array(Vec<DataValue>),
    Object(serde_json::Value),
}

impl DataValue {
    pub fn to_json_value(&self) -> serde_json::Value {
        match self {
            DataValue::Null => serde_json::Value::Null,
            DataValue::Bool(v) => serde_json::Value::Bool(*v),
            DataValue::Int(v) => serde_json::json!(*v),
            DataValue::UInt(v) => serde_json::json!(*v),
            DataValue::Float(v) => serde_json::json!(*v),
            DataValue::Text(v) => serde_json::json!(v),
            DataValue::Bytes(v) => serde_json::json!(v),
            DataValue::Array(v) => {
                serde_json::Value::Array(v.iter().map(DataValue::to_json_value).collect())
            }
            DataValue::Object(v) => v.clone(),
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PointMonitorInfo {
    pub protocol: String,
    pub source_id: Uuid,
    pub point_id: Uuid,
    pub client_handle: u32,
    pub scan_mode: ScanMode,
    #[serde(serialize_with = "crate::util::datetime::option_utc_to_local_str")]
    pub timestamp: Option<DateTime<Utc>>,
    pub quality: PointQuality,
    pub value: Option<DataValue>,
    pub value_type: Option<ValueType>,
    pub value_text: Option<String>,
    pub old_value: Option<DataValue>,
    #[serde(serialize_with = "crate::util::datetime::option_utc_to_local_str")]
    pub old_timestamp: Option<DateTime<Utc>>,
    pub value_changed: bool,
}

impl PointMonitorInfo {
    pub fn value_as_json(&self) -> Option<serde_json::Value> {
        self.value.as_ref().map(DataValue::to_json_value)
    }
}

#[derive(Debug, Clone)]
pub struct PointNewValue {
    pub source_id: Uuid,
    pub point_id: Option<Uuid>,
    pub client_handle: u32,
    pub value: Option<DataValue>,
    pub value_type: Option<ValueType>,
    pub value_text: Option<String>,
    pub quality: PointQuality,
    pub protocol: String,
    pub timestamp: Option<DateTime<Utc>>,
    pub scan_mode: ScanMode,
}


pub fn opcua_variant_to_data(value: &opcua::types::Variant) -> DataValue {
    use opcua::types::Variant;

    match value {
        Variant::Empty => DataValue::Null,
        Variant::Boolean(v) => DataValue::Bool(*v),
        Variant::SByte(v) => DataValue::Int(*v as i64),
        Variant::Byte(v) => DataValue::UInt(*v as u64),
        Variant::Int16(v) => DataValue::Int(*v as i64),
        Variant::UInt16(v) => DataValue::UInt(*v as u64),
        Variant::Int32(v) => DataValue::Int(*v as i64),
        Variant::UInt32(v) => DataValue::UInt(*v as u64),
        Variant::Int64(v) => DataValue::Int(*v),
        Variant::UInt64(v) => DataValue::UInt(*v),
        Variant::Float(v) => DataValue::Float(*v as f64),
        Variant::Double(v) => DataValue::Float(*v),
        Variant::String(v) => DataValue::Text(v.to_string()),
        Variant::ByteString(v) => DataValue::Bytes(v.value.clone().unwrap_or_default()),
        Variant::Array(v) => {
            DataValue::Array(v.values.iter().map(opcua_variant_to_data).collect())
        }
        _ => DataValue::Text(value.to_string()),
    }
}

pub fn opcua_variant_type(value: &opcua::types::Variant) -> ValueType {
    use opcua::types::Variant;
    match value {
        Variant::Empty => ValueType::Null,
        Variant::Boolean(_) => ValueType::Bool,
        Variant::SByte(_) | Variant::Int16(_) | Variant::Int32(_) | Variant::Int64(_) => ValueType::Int,
        Variant::Byte(_) | Variant::UInt16(_) | Variant::UInt32(_) | Variant::UInt64(_) => ValueType::UInt,
        Variant::Float(_) | Variant::Double(_) => ValueType::Float,
        Variant::String(_) => ValueType::Text,
        Variant::ByteString(_) => ValueType::Bytes,
        Variant::Array(_) => ValueType::Array,
        _ => ValueType::Text,
    }
}