use axum::http::StatusCode;
use sqlx::PgPool;
use twilight_interactions::command::{CommandModel, CreateCommand};
use twilight_mention::{Mention, timestamp::{TimestampStyle, Timestamp}};
use twilight_model::{id::{Id, marker::{InteractionMarker, ChannelMarker, UserMarker}}, http::interaction::{InteractionResponse, InteractionResponseType, InteractionResponseData}, channel::message::MessageFlags};

#[derive(CommandModel, CreateCommand)]
#[command(name = "set_fact", desc = "Quietly save a fact")]
pub struct SetFactCommand {
    #[command(rename = "name", desc = "Fact name")]
    fact_name: String,
    #[command(rename = "value", desc = "Fact value")]
    fact_value: String,
}

#[derive(CommandModel, CreateCommand)]
#[command(name = "get_fact", desc = "Retrieve and display the value of a fact")]
pub struct GetFactCommand {
    #[command(rename = "name", desc = "Fact name")]
    fact_name: String,
    #[command(desc = "Should it be displayed publically, by default it won't be")]
    public: Option<bool>,
}


pub async fn set_fact(
    interaction_id: Id<InteractionMarker>,
    channel_id: Option<Id<ChannelMarker>>,
    author_id: Id<UserMarker>,
    command_data: SetFactCommand,
    pg_pool: &PgPool,
) -> Result<InteractionResponse, (StatusCode, String)> {
    let Ok(()) = crate::database::set_fact(
        pg_pool,
        interaction_id.to_string(), 
        channel_id.map(|cid| cid.to_string()), 
        author_id.to_string(), 
        command_data.fact_name.to_owned(),
        command_data.fact_value.to_owned()).await else {
        return Err((StatusCode::INTERNAL_SERVER_ERROR, "Error saving fact.".to_string()));
    };

    Ok(InteractionResponse {
        kind: InteractionResponseType::ChannelMessageWithSource,
        data: Some(InteractionResponseData {
            content: Some(format!(
                "Set {0} to {1}",
                command_data.fact_name, command_data.fact_value
            )),
            flags: Some(MessageFlags::EPHEMERAL),
            ..Default::default()
        }),
    })
}

pub async fn get_fact(
    channel_id: Option<Id<ChannelMarker>>,
    author_id: Id<UserMarker>,
    command_data: GetFactCommand,
    pg_pool: &PgPool,
) -> Result<InteractionResponse, (StatusCode, String)> {
    let Ok(fact) = crate::database::get_fact(
        pg_pool,
        channel_id.map(|cid| cid.to_string()),
        author_id.to_string(),
        command_data.fact_name.to_owned(),
    ).await else {
        return Err((StatusCode::INTERNAL_SERVER_ERROR, "Error retrieving fact.".to_string()));
    };

    let content = match fact {
        None => format!("Fact {0} in channel {1} by you, {2}, was not found.",
            command_data.fact_name,
            channel_id.map_or("<none>".to_string(), |cid| cid.mention().to_string()),
            author_id.mention()
        ),
        Some(fact) => format!(
            "Fact **{0}** was set to **{1}** by {2} at {3}, and was reset {4} times in total since {5}.",
            command_data.fact_name, 
            fact.value, 
            author_id.mention(),
            Timestamp::new(fact.updated_at.unix_timestamp().try_into().unwrap(), Some(TimestampStyle::RelativeTime)).mention(),
            fact.version,
            Timestamp::new(fact.created_at.unix_timestamp().try_into().unwrap(), Some(TimestampStyle::ShortDateTime)).mention(),
        ),
    };

    Ok(InteractionResponse {
        kind: InteractionResponseType::ChannelMessageWithSource,
        data: Some(InteractionResponseData {
            content: Some(content),
            flags: match command_data.public { Some(true) => None, _ => Some(MessageFlags::EPHEMERAL) },
            ..Default::default()
        }),
    })
}