pub(crate) mod movement_graph;
pub(crate) mod render_graph;

pub(crate) mod graph_explorer {
    use anyhow::Result;
    use hyperlog_core::log::GraphItem;
    use ratatui::{prelude::*, widgets::*};

    use crate::{
        command_parser::Commands, components::movement_graph::GraphItemType, models::Msg,
        state::SharedState,
    };

    use super::movement_graph::{MovementGraph, MovementGraphItem};
    use super::render_graph::RenderGraph;

    pub struct GraphExplorer<'a> {
        state: SharedState,

        pub inner: GraphExplorerState<'a>,
    }

    pub struct GraphExplorerState<'a> {
        root: String,

        current_path: Option<&'a str>,
        current_position: Vec<usize>,

        graph: Option<GraphItem>,
    }

    impl<'a> GraphExplorer<'a> {
        pub fn new(root: String, state: SharedState) -> Self {
            Self {
                state,
                inner: GraphExplorerState::<'a> {
                    root,
                    current_path: None,
                    current_position: Vec::new(),
                    graph: None,
                },
            }
        }

        pub fn update_graph(&mut self) -> Result<&mut Self> {
            let now = std::time::SystemTime::now();

            let graph = self
                .state
                .querier
                .get(
                    &self.inner.root,
                    self.inner
                        .current_path
                        .map(|p| p.split('.').collect::<Vec<_>>())
                        .unwrap_or_default(),
                )
                .ok_or(anyhow::anyhow!("graph should've had an item"))?;

            self.inner.graph = Some(graph);

            let elapsed = now.elapsed()?;
            tracing::trace!("Graph.update_graph took: {}nanos", elapsed.as_nanos());

            Ok(self)
        }

        fn linearize_graph(&self) -> Option<MovementGraph> {
            self.inner.graph.clone().map(|g| g.into())
        }

        /// Will only incrmeent to the next level
        ///
        /// Current: 0.1.0
        /// Available: 0.1.0.[0,1,2]
        /// Choses: 0.1.0.0 else nothing
        pub(crate) fn move_right(&mut self) -> Result<()> {
            if let Some(graph) = self.linearize_graph() {
                tracing::debug!("graph: {:?}", graph);
                let position_items = &self.inner.current_position;

                if let Some(next_item) = graph.next_right(position_items) {
                    self.inner.current_position.push(next_item.index);
                    tracing::trace!("found next item: {:?}", self.inner.current_position);
                }
            }

            Ok(())
        }

        /// Will only incrmeent to the next level
        ///
        /// Current: 0.1.0
        /// Available: 0.[0,1,2].0
        /// Choses: 0.1 else nothing
        pub(crate) fn move_left(&mut self) -> Result<()> {
            if let Some(last) = self.inner.current_position.pop() {
                tracing::trace!(
                    "found last item: {:?}, popped: {}",
                    self.inner.current_position,
                    last
                );
            }

            Ok(())
        }

        /// Will move up if a sibling exists, or up to the most common sibling between sections
        ///
        /// Current: 0.1.1
        /// Available: 0.[0.[0,1],1.[0,1]]
        /// Chose: 0.1.0 again 0.0 We don't choose a subitem in the next three instead we just find the most common sibling
        pub(crate) fn move_up(&mut self) -> Result<()> {
            if let Some(graph) = self.linearize_graph() {
                let position_items = &self.inner.current_position;

                if let Some(next_item) = graph.next_up(position_items) {
                    self.inner.current_position = next_item;
                    tracing::trace!("found next up: {:?}", self.inner.current_position)
                }
            }

            Ok(())
        }

        /// Will move down if a sibling exists, or down to the most common sibling between sections
        ///
        /// Current: 0.0.0
        /// Available: 0.[0.[0,1],1.[0,1]]
        /// Chose: 0.0.1 again 0.1
        pub(crate) fn move_down(&mut self) -> Result<()> {
            if let Some(graph) = self.linearize_graph() {
                let position_items = &self.inner.current_position;

                if let Some(next_item) = graph.next_down(position_items) {
                    self.inner.current_position = next_item;
                    tracing::trace!("found next down: {:?}", self.inner.current_position)
                }
            }

            Ok(())
        }

        pub(crate) fn get_current_path(&self) -> Vec<String> {
            let graph = self.linearize_graph();
            let position_items = &self.inner.current_position;

            if let Some(graph) = graph {
                graph.to_current_path(position_items)
            } else {
                Vec::new()
            }
        }

        fn get_current_item(&self) -> Option<MovementGraphItem> {
            let graph = self.linearize_graph();

            if let Some(graph) = graph {
                graph.get_graph_item(&self.inner.current_position).cloned()
            } else {
                None
            }
        }

        pub fn execute_command(&mut self, command: &Commands) -> anyhow::Result<Option<Msg>> {
            match command {
                Commands::Archive => {
                    if !self.get_current_path().is_empty() {
                        tracing::debug!("archiving path: {:?}", self.get_current_path())
                    }
                }
                Commands::CreateSection { name } => {
                    if !name.is_empty() {
                        let mut path = self.get_current_path();
                        path.push(name.replace(" ", "-").replace(".", "-"));

                        self.state.commander.execute(
                            hyperlog_core::commander::Command::CreateSection {
                                root: self.inner.root.clone(),
                                path,
                            },
                        )?;
                    }
                }
                Commands::Edit => {
                    if let Some(item) = self.get_current_item() {
                        let path = self.get_current_path();

                        tracing::debug!(
                            "found item to edit: path: {}, item: {}",
                            path.join("."),
                            item.name
                        );
                        match item.item_type {
                            GraphItemType::Section => {
                                todo!("cannot edit section at the moment")
                            }
                            GraphItemType::Item { .. } => {
                                if let Some(item) = self.state.querier.get(&self.inner.root, path) {
                                    if let GraphItem::Item { .. } = item {
                                        return Ok(Some(Msg::OpenEditItemDialog { item }));
                                    }
                                }
                            }
                        }
                    }
                }
                _ => (),
            }

            self.update_graph()?;

            Ok(None)
        }

        pub(crate) fn interact(&mut self) -> anyhow::Result<()> {
            if !self.get_current_path().is_empty() {
                tracing::info!("toggling state of items");

                self.state
                    .commander
                    .execute(hyperlog_core::commander::Command::ToggleItem {
                        root: self.inner.root.to_string(),
                        path: self.get_current_path(),
                    })?;
            }

            self.update_graph()?;

            Ok(())
        }
    }

    impl<'a> StatefulWidget for GraphExplorer<'a> {
        type State = GraphExplorerState<'a>;

        fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State) {
            let Rect { height, .. } = area;
            let _height = height as usize;

            if let Some(graph) = &state.graph {
                let movement_graph: MovementGraph = graph.clone().into();
                let lines = movement_graph.render_graph(&state.current_position);
                let para = Paragraph::new(lines);
                para.render(area, buf);
            }
        }
    }
}