use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use serde_json::{json, Value};

use super::constants::AP_CONTEXT;
use super::views::get_actor_url;
use super::vocabulary::*;

#[derive(Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Attachment {
    pub name: Option<String>,

    #[serde(rename = "type")]
    pub attachment_type: String,

    pub media_type: Option<String>,
    pub url: Option<String>,
}

fn default_tag_type() -> String { HASHTAG.to_string() }

#[derive(Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Tag {
    pub name: Option<String>,

    #[serde(rename = "type", default = "default_tag_type")]
    pub tag_type: String,

    pub href: Option<String>,
}

#[derive(Default, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Object {
    #[serde(rename = "@context")]
    pub context: Option<Value>,

    pub id: String,

    #[serde(rename = "type")]
    pub object_type: String,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub name: Option<String>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub actor: Option<String>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub attachment: Option<Value>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub cc: Option<Value>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub former_type: Option<String>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub object: Option<String>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub published: Option<DateTime<Utc>>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub attributed_to: Option<Value>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub in_reply_to: Option<String>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub content: Option<String>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub tag: Option<Vec<Tag>>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub to: Option<Value>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub updated: Option<DateTime<Utc>>,
}

#[derive(Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Activity {
    #[serde(rename = "@context")]
    pub context: Value,

    pub id: String,
    
    #[serde(rename = "type")]
    pub activity_type: String,

    pub actor: String,
    pub object: Value,
    pub to: Option<Value>,
    pub cc: Option<Value>,
}

pub fn create_activity(
    instance_url: &str,
    actor_name: &str,
    activity_type: &str,
    activity_id: String,
    object: impl Serialize,
    primary_audience: Vec<String>,
    secondary_audience: Vec<String>,
) -> Activity {
    let actor_id = get_actor_url(
        instance_url,
        actor_name,
    );
    Activity {
        context: json!(AP_CONTEXT),
        id: activity_id,
        activity_type: activity_type.to_string(),
        actor: actor_id,
        object: serde_json::to_value(object).unwrap(),
        to: Some(json!(primary_audience)),
        cc: Some(json!(secondary_audience)),
    }
}