use super::{
    get_player_item_or_fail, parsing::parse_count, search_items_for_user, user_error,
    ItemSearchParams, UResult, UserVerb, UserVerbRef, VerbContext,
};
use crate::{
    models::item::LocationActionType,
    regular_tasks::queued_command::{
        queue_command, QueueCommand, QueueCommandHandler, QueuedCommandContext,
    },
    services::{
        capacity::{check_item_capacity, CapacityLevel},
        comms::broadcast_to_room,
    },
    static_content::possession_type::possession_data,
};
use async_trait::async_trait;
use std::time;

pub struct QueueHandler;
#[async_trait]
impl QueueCommandHandler for QueueHandler {
    async fn start_command(&self, ctx: &mut QueuedCommandContext<'_>) -> UResult<time::Duration> {
        if ctx.item.death_data.is_some() {
            user_error(
                "You try to get it, but your ghostly hands slip through it uselessly".to_owned(),
            )?;
        }
        let item_id = match ctx.command {
            QueueCommand::Get { possession_id } => possession_id,
            _ => user_error("Unexpected command".to_owned())?,
        };
        let item = match ctx
            .trans
            .find_item_by_type_code("possession", &item_id)
            .await?
        {
            None => user_error("Item not found".to_owned())?,
            Some(it) => it,
        };
        if item.location != ctx.item.location {
            user_error(format!(
                "You try to get {} but realise it is no longer there",
                item.display_for_sentence(ctx.explicit().await?, 1, false)
            ))?
        }
        let msg_exp = format!(
            "{} fumbles around trying to pick up {}\n",
            &ctx.item.display_for_sentence(true, 1, true),
            &item.display_for_sentence(true, 1, false)
        );
        let msg_nonexp = format!(
            "{} fumbles around trying to pick up {}\n",
            &ctx.item.display_for_sentence(false, 1, true),
            &item.display_for_sentence(false, 1, false)
        );
        broadcast_to_room(
            ctx.trans,
            &ctx.item.location,
            None,
            &msg_exp,
            Some(&msg_nonexp),
        )
        .await?;
        Ok(time::Duration::from_secs(1))
    }

    #[allow(unreachable_patterns)]
    async fn finish_command(&self, ctx: &mut QueuedCommandContext<'_>) -> UResult<()> {
        if ctx.item.death_data.is_some() {
            user_error(
                "You try to get it, but your ghostly hands slip through it uselessly".to_owned(),
            )?;
        }
        let item_id = match ctx.command {
            QueueCommand::Get { possession_id } => possession_id,
            _ => user_error("Unexpected command".to_owned())?,
        };
        let item = match ctx
            .trans
            .find_item_by_type_code("possession", &item_id)
            .await?
        {
            None => user_error("Item not found".to_owned())?,
            Some(it) => it,
        };
        if item.location != ctx.item.location {
            user_error(format!(
                "You try to get {} but realise it is no longer there",
                &item.display_for_sentence(ctx.explicit().await?, 1, false)
            ))?
        }

        let possession_data = match item
            .possession_type
            .as_ref()
            .and_then(|pt| possession_data().get(&pt))
        {
            None => {
                user_error("That item no longer exists in the game so can't be handled".to_owned())?
            }
            Some(pd) => pd,
        };

        let player_as_loc = format!("{}/{}", &ctx.item.item_type, &ctx.item.item_code);
        match check_item_capacity(ctx.trans, &player_as_loc, possession_data.weight).await? {
            CapacityLevel::AboveItemLimit => {
                user_error("You just can't hold that many things!".to_owned())?
            }
            CapacityLevel::OverBurdened => {
                let explicit = ctx.explicit().await?;
                user_error(format!(
                    "{} You drop {} because it is too heavy!",
                    if explicit { "Fuck!" } else { "Rats!" },
                    &ctx.item.display_for_sentence(explicit, 1, false)
                ))?
            }
            _ => (),
        }

        let msg_exp = format!(
            "{} picks up {}\n",
            &ctx.item.display_for_sentence(true, 1, true),
            &item.display_for_sentence(true, 1, false)
        );
        let msg_nonexp = format!(
            "{} picks up {}\n",
            &ctx.item.display_for_sentence(false, 1, true),
            &item.display_for_sentence(false, 1, false)
        );
        broadcast_to_room(
            ctx.trans,
            &ctx.item.location,
            None,
            &msg_exp,
            Some(&msg_nonexp),
        )
        .await?;
        let mut item_mut = (*item).clone();
        item_mut.location = player_as_loc;
        item_mut.action_type = LocationActionType::Normal;
        ctx.trans.save_item_model(&item_mut).await?;
        Ok(())
    }
}

pub struct Verb;
#[async_trait]
impl UserVerb for Verb {
    async fn handle(
        self: &Self,
        ctx: &mut VerbContext,
        _verb: &str,
        mut remaining: &str,
    ) -> UResult<()> {
        let player_item = get_player_item_or_fail(ctx).await?;
        // TODO: Parse "get target from container" variant
        let mut get_limit = Some(1);
        if remaining == "all" || remaining.starts_with("all ") {
            remaining = remaining[3..].trim();
            get_limit = None;
        } else if let (Some(n), remaining2) = parse_count(remaining) {
            get_limit = Some(n);
            remaining = remaining2;
        }
        let targets = search_items_for_user(
            ctx,
            &ItemSearchParams {
                include_loc_contents: true,
                item_type_only: Some("possession"),
                limit: get_limit.unwrap_or(100),
                ..ItemSearchParams::base(&player_item, &remaining)
            },
        )
        .await?;
        if player_item.death_data.is_some() {
            user_error(
                "You try to get it, but your ghostly hands slip through it uselessly".to_owned(),
            )?;
        }

        let mut did_anything: bool = false;
        let mut player_item_mut = (*player_item).clone();
        for target in targets
            .iter()
            .filter(|t| t.action_type.is_visible_in_look())
        {
            if target.item_type != "possession" {
                user_error("You can't get that!".to_owned())?;
            }
            did_anything = true;
            queue_command(
                ctx,
                &mut player_item_mut,
                &QueueCommand::Get {
                    possession_id: target.item_code.clone(),
                },
            )
            .await?;
        }
        if !did_anything {
            user_error("I didn't find anything matching.".to_owned())?;
        } else {
            ctx.trans.save_item_model(&player_item_mut).await?;
        }
        Ok(())
    }
}
static VERB_INT: Verb = Verb;
pub static VERB: UserVerbRef = &VERB_INT as UserVerbRef;