use super::{
    get_player_item_or_fail, parsing::parse_count, search_items_for_user, user_error,
    ItemSearchParams, UResult, UserError, UserVerb, UserVerbRef, VerbContext,
};
use crate::{
    models::item::{Buff, BuffCause, BuffImpact, LocationActionType, SkillType},
    regular_tasks::queued_command::{
        queue_command, QueueCommand, QueueCommandHandler, QueuedCommandContext,
    },
    services::{comms::broadcast_to_room, skills::calculate_total_stats_skills_for_user},
    static_content::possession_type::possession_data,
};
use async_trait::async_trait;
use chrono::Utc;
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 wear it, but your ghostly hands slip through it uselessly".to_owned(),
            )?;
        }
        let item_id = match ctx.command {
            QueueCommand::Wear { 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,
        };
        let explicit = ctx.explicit().await?;
        if item.location != ctx.item.refstr() {
            user_error(format!(
                "You try to wear {} but realise you no longer have it",
                item.display_for_sentence(explicit, 1, false)
            ))?
        }

        if item.action_type == LocationActionType::Worn {
            user_error("You realise you're already wearing it!".to_owned())?;
        }

        let poss_data = item
            .possession_type
            .as_ref()
            .and_then(|pt| possession_data().get(&pt))
            .ok_or_else(|| {
                UserError("That item no longer exists in the game so can't be handled".to_owned())
            })?;

        poss_data
            .wear_data
            .as_ref()
            .ok_or_else(|| UserError("You can't wear that!".to_owned()))?;

        let msg = format!(
            "{} fumbles around trying to put on {}\n",
            &ctx.item.display_for_sentence(true, 1, true),
            &item.display_for_sentence(true, 1, false)
        );
        broadcast_to_room(ctx.trans, &ctx.item.location, None, &msg).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 wear it, but your ghostly hands slip through it uselessly".to_owned(),
            )?;
        }
        let item_id = match ctx.command {
            QueueCommand::Wear { 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,
        };
        let explicit = ctx.explicit().await?;
        if item.location != ctx.item.refstr() {
            user_error(format!(
                "You try to wear {} but realise it is no longer there.",
                &item.display_for_sentence(explicit, 1, false)
            ))?
        }

        if item.action_type == LocationActionType::Worn {
            user_error("You realise you're already wearing it!".to_owned())?;
        }

        let poss_data = item
            .possession_type
            .as_ref()
            .and_then(|pt| possession_data().get(&pt))
            .ok_or_else(|| {
                UserError("That item no longer exists in the game so can't be handled".to_owned())
            })?;

        let wear_data = poss_data
            .wear_data
            .as_ref()
            .ok_or_else(|| UserError("You can't wear that!".to_owned()))?;

        let other_clothes = ctx
            .trans
            .find_by_action_and_location(&ctx.item.refstr(), &LocationActionType::Worn)
            .await?;
        for part in &wear_data.covers_parts {
            let thickness: f64 =
                other_clothes
                    .iter()
                    .fold(wear_data.thickness, |tot, other_item| {
                        match other_item
                            .possession_type
                            .as_ref()
                            .and_then(|pt| possession_data().get(&pt))
                            .and_then(|pd| pd.wear_data.as_ref())
                        {
                            Some(wd) if wd.covers_parts.contains(&part) => tot + wd.thickness,
                            _ => tot,
                        }
                    });
            if thickness > 12.0 {
                user_error(format!(
                    "You're wearing too much on your {} already.",
                    part.display(ctx.item.sex.clone())
                ))?;
            }
        }

        let msg = format!(
            "{} wears {}\n",
            &ctx.item.display_for_sentence(true, 1, true),
            &item.display_for_sentence(true, 1, false)
        );
        broadcast_to_room(ctx.trans, &ctx.item.location, None, &msg).await?;
        let mut item_mut = (*item).clone();
        item_mut.action_type = LocationActionType::Worn;
        item_mut.action_type_started = Some(Utc::now());

        if wear_data.dodge_penalty != 0.0 {
            ctx.item.temporary_buffs.push(Buff {
                description: "Dodge penalty".to_owned(),
                cause: BuffCause::ByItem {
                    item_type: item_mut.item_type.clone(),
                    item_code: item_mut.item_code.clone(),
                },
                impacts: vec![BuffImpact::ChangeSkill {
                    skill: SkillType::Dodge,
                    magnitude: -wear_data.dodge_penalty,
                }],
            });
            if ctx.item.item_type == "player" {
                if let Some(usr) = ctx.trans.find_by_username(&ctx.item.item_code).await? {
                    calculate_total_stats_skills_for_user(ctx.item, &usr);
                }
            }
        }

        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?;
        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_contents: true,
                item_type_only: Some("possession"),
                limit: get_limit.unwrap_or(100),
                item_action_type_only: Some(&LocationActionType::Normal),
                ..ItemSearchParams::base(&player_item, &remaining)
            },
        )
        .await?;
        if player_item.death_data.is_some() {
            user_error("The dead don't dress themselves".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 wear that!".to_owned())?;
            }
            did_anything = true;
            queue_command(
                ctx,
                &mut player_item_mut,
                &QueueCommand::Wear {
                    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;