use std::collections::HashSet;

use freya::prelude::*;
use freya::router::RouterContext;
use oneclient_core::GameVersionKind;
use oneclient_core::clusters::{ClusterKind, ModpackSource};

use super::copy::{footer_note, heading, is_ready, step_value};
use super::data::{Picks, resolve};
use super::details::DetailsState;
use super::model::*;
use super::rail::{Rail, RowState, rail, steps_card, version_art};
use super::shell::{Shell, shell};
use super::steps;
use crate::Route;
use crate::hooks::{
    ClusterAction, settled_or_loading, use_active_cluster_id, use_cluster_mutation, use_clusters,
    use_dispatch,
};
use crate::utils::default_cluster;

const MODPACK_BROWSE_TYPE: &str = "modpack";
const MODPACK_EXTENSIONS: [&str; 2] = ["mrpack", "zip"];

fn create_action(wizard: Wizard, picks: &Picks) -> Option<ClusterAction> {
    let mc_version = picks.versions.chosen.clone()?;
    let mc_loader = picks.loader.chosen?;

    Some(ClusterAction::CreateInstance {
        kind: picks.kind,
        name: picks.name.trim().to_string(),
        mc_version,
        mc_loader,
        mc_loader_version: picks.loader.version.clone(),
        description: wizard.details.description_value(),
        tags: wizard.details.tags.read().clone(),
        cover_source: wizard.details.cover.read().clone(),
        bundles: (picks.kind == ClusterKind::OneClient && picks.bundles.loaded)
            .then(|| picks.bundles.taken()),
    })
}

fn wizard_rail(wizard: Wizard, picks: &Picks) -> Element {
    let description = wizard.details.description.read().trim().to_string();
    let tags = wizard.details.tags.read().clone();

    let title = if picks.name.trim().is_empty() {
        "New instance".to_string()
    } else {
        picks.name.clone()
    };

    let subtitle = if description.is_empty() {
        match picks.choice {
            TypeChoice::OneClient => match &picks.versions.chosen {
                Some(version) => format!("OneClient · {version}"),
                None => "OneClient".to_string(),
            },
            TypeChoice::Scratch => match &picks.versions.chosen {
                Some(version) => format!("{version} · {}", picks.loader_label()),
                None => picks.loader_label(),
            },
            TypeChoice::Modpack => "Modpack".to_string(),
        }
    } else {
        description
    };

    let rows = picks
        .steps
        .iter()
        .enumerate()
        .map(|(index, step)| {
            let state = if index < picks.index {
                RowState::Done
            } else if index == picks.index {
                RowState::Current
            } else {
                RowState::Pending
            };
            let value = if state == RowState::Pending {
                String::new()
            } else {
                step_value(wizard, picks, *step)
            };
            (step.label(), value, state)
        })
        .collect();

    let art = if picks.choice == TypeChoice::Modpack {
        version_art(None, None)
    } else {
        version_art(picks.versions.chosen.as_deref(), picks.loader.chosen)
    }
    .picked_cover(wizard.details.cover.read().clone());

    rail(Rail {
        art,
        title,
        subtitle,
        card: steps_card(rows),
        tags: if picks.step == Step::Customize {
            tags
        } else {
            Vec::new()
        },
    })
}

#[derive(PartialEq)]
pub struct CreateInstanceModal {
    on_close: EventHandler<()>,
}

impl CreateInstanceModal {
    pub fn new(on_close: impl Into<EventHandler<()>>) -> Self {
        Self {
            on_close: on_close.into(),
        }
    }
}

impl Component for CreateInstanceModal {
    fn render(&self) -> impl IntoElement {
        let mutation = use_cluster_mutation();
        let wizard = Wizard {
            step: use_state(|| 0usize),
            choice: use_state(|| TypeChoice::OneClient),
            version: use_state(|| None::<String>),
            filter: use_state(|| kind_bit(GameVersionKind::Release)),
            query: use_state(String::new),
            loader: use_state(|| LoaderChoice::Fabric),
            loader_version: use_state(|| None::<String>),
            declined: use_state(|| None::<HashSet<String>>),
            modpack_origin: use_state(|| ModpackOrigin::Browse),
            details: DetailsState::blank(),
        };
        let dispatch = use_dispatch();
        let browse_cluster = browse_cluster();

        let picks = resolve(wizard);
        let action = create_action(wizard, &picks);
        let (title, subtitle) = heading(&picks);

        let first = picks.index == 0;
        let last = picks.step == Step::Customize;
        let modpack_step = picks.step == Step::Modpack;
        let origin = picks.modpack_origin;
        let index = picks.index;
        let mut step = wizard.step;
        let mut query = wizard.query;

        let close_x = self.on_close.clone();
        let close_cancel = self.on_close.clone();
        let close_created = self.on_close.clone();
        let close_modpack = self.on_close.clone();

        shell(Shell {
            rail: wizard_rail(wizard, &picks),
            eyebrow: None,
            title: title.to_string(),
            subtitle,
            body: steps::body(wizard, &picks),
            scrolls_itself: picks.step == Step::Version,
            note: footer_note(&picks),
            secondary_label: if first { "Cancel" } else { "Back" }.to_string(),
            primary_label: match (modpack_step, origin) {
                (true, ModpackOrigin::Browse) => "Browse modpacks",
                (true, ModpackOrigin::File) => "Choose file",
                (false, _) if last => "Create instance",
                (false, _) => "Next",
            }
            .to_string(),
            primary_enabled: is_ready(&picks),
            on_close: (move |()| close_x.call(())).into(),
            on_secondary: (move |()| {
                if first {
                    close_cancel.call(());
                } else {
                    step.set(index.saturating_sub(1));
                }
            })
            .into(),
            on_primary: (move |()| {
                if modpack_step {
                    start_modpack(
                        origin,
                        browse_cluster,
                        dispatch.clone(),
                        close_modpack.clone(),
                    );
                } else if last {
                    if let Some(action) = action.clone() {
                        mutation.mutate(action);
                        close_created.call(());
                    }
                } else {
                    query.set(String::new());
                    step.set(index + 1);
                }
            })
            .into(),
        })
    }
}

fn browse_cluster() -> i64 {
    let clusters = settled_or_loading(&use_clusters()).unwrap_or_default();
    let active = *use_active_cluster_id().read();

    default_cluster(clusters, active)
        .map(|cluster| cluster.id)
        .unwrap_or_default()
}

fn start_modpack(
    origin: ModpackOrigin,
    cluster_id: i64,
    dispatch: crate::Actions,
    on_close: EventHandler<()>,
) {
    match origin {
        ModpackOrigin::Browse => {
            on_close.call(());
            let _ = RouterContext::get().push(Route::Browser {
                cluster_id,
                package_type: MODPACK_BROWSE_TYPE.to_string(),
                pick_cluster: true,
            });
        }
        ModpackOrigin::File => {
            spawn(async move {
                let Some(handle) = rfd::AsyncFileDialog::new()
                    .set_title("Choose a modpack")
                    .add_filter("Modpack", &MODPACK_EXTENSIONS)
                    .pick_file()
                    .await
                else {
                    return;
                };
                dispatch.install_modpack(ModpackSource::File(handle.path().to_path_buf()));
                on_close.call(());
            });
        }
    }
}