use bevy::ecs::system::RunSystemOnce;
use pomomon_garden::features::grid::components::{Grid, Tile, TileState};
use pomomon_garden::features::inventory::components::{Inventory, ItemStack, ItemType};
use pomomon_garden::features::pom::actions::InteractionAction;
use pomomon_garden::prelude::*;

fn setup_interaction_app(
    grid_width: u32,
    grid_height: u32,
    initial_tile_states: &[(u32, u32, TileState)],
    initial_inventory: Vec<(ItemType, u32)>,
) -> App {
    let mut app = App::new();
    app.add_plugins(MinimalPlugins);
    app.add_plugins(AssetPlugin::default()); // Needed for asset server if used, though we mock or avoid visuals here

    // Grid Setup
    let mut grid_tiles = Vec::with_capacity(grid_width as usize);
    for x in 0..grid_width {
        let mut column = Vec::with_capacity(grid_height as usize);
        for y in 0..grid_height {
            let entity = app
                .world_mut()
                .spawn((Tile { x, y }, TileState::Unclaimed))
                .id();
            column.push(entity);
        }
        grid_tiles.push(column);
    }
    app.world_mut().insert_resource(Grid {
        width: grid_width,
        height: grid_height,
        tiles: grid_tiles,
    });

    for &(x, y, ref state) in initial_tile_states {
        if let Ok(entity) = app.world().resource::<Grid>().get_tile((x, y)) {
            *app.world_mut().get_mut::<TileState>(entity).unwrap() = state.clone();
        }
    }

    // Inventory Setup
    let mut inventory_items = Vec::new();
    for (item_type, amount) in initial_inventory {
        let id = app.world_mut().spawn(ItemStack { item_type, amount }).id();
        inventory_items.push(id);
    }
    app.world_mut().insert_resource(Inventory {
        items: inventory_items,
    });

    app
}

#[test]
fn test_plant_seed_interaction() {
    let seed_type = ItemType::BerrySeed {
        name: "TestSeed".into(),
    };
    let mut app = setup_interaction_app(
        3,
        3,
        &[(1, 1, TileState::Empty)],
        vec![(seed_type.clone(), 1)],
    );

    // Run the interaction logic as a system or closure
    app.world_mut().run_system_once(
        move |grid: Res<Grid>,
              mut tile_query: Query<&mut TileState>,
              mut inventory: ResMut<Inventory>,
              mut item_stack_query: Query<&mut ItemStack>,
              mut commands: Commands| {
            let action = InteractionAction::Plant(seed_type.clone());
            action.execute(
                (1, 1),
                &grid,
                &mut tile_query,
                &mut inventory,
                &mut item_stack_query,
                &mut commands,
            );
        },
    );

    // Apply commands (despawns etc.)
    app.update();

    // Assert Tile State
    let grid = app.world().resource::<Grid>();
    let tile_entity = grid.get_tile((1, 1)).unwrap();
    let tile_state = app.world().entity(tile_entity).get::<TileState>().unwrap();

    if let TileState::Occupied { seed } = tile_state {
        assert_eq!(
            *seed,
            ItemType::BerrySeed {
                name: "TestSeed".into()
            }
        );
    } else {
        panic!("Tile should be Occupied with seed, found {:?}", tile_state);
    }

    // Assert Inventory Empty
    let inventory = app.world().resource::<Inventory>();
    // Item stack entity should be despawned or amount 0
    if !inventory.items.is_empty() {
        // If the entity still exists, check amount
        if let Some(entity) = inventory.items.first() {
            if let Some(stack) = app.world().entity(*entity).get::<ItemStack>() {
                assert_eq!(stack.amount, 0, "Item amount should be 0");
            } else {
                // Entity might be despawned but still in inventory list until cleanup?
                // Inventory struct implementation removes it from vector if using update_item_stack properly?
                // update_item_stack does `self.items.remove(index);`
                // So the list should be empty.
                panic!(
                    "Inventory items list should be empty or point to valid 0 amount entities. Found phantom entity."
                );
            }
        }
    } else {
        assert!(inventory.items.is_empty());
    }
}

#[test]
fn test_plant_seed_no_inventory() {
    let seed_type = ItemType::BerrySeed {
        name: "TestSeed".into(),
    };
    let mut app = setup_interaction_app(
        3,
        3,
        &[(1, 1, TileState::Empty)],
        vec![], // Empty inventory
    );

    app.world_mut().run_system_once(
        move |grid: Res<Grid>,
              mut tile_query: Query<&mut TileState>,
              mut inventory: ResMut<Inventory>,
              mut item_stack_query: Query<&mut ItemStack>,
              mut commands: Commands| {
            let action = InteractionAction::Plant(seed_type.clone());
            action.execute(
                (1, 1),
                &grid,
                &mut tile_query,
                &mut inventory,
                &mut item_stack_query,
                &mut commands,
            );
        },
    );

    app.update();

    // Assert Tile State Unchanged
    let grid = app.world().resource::<Grid>();
    let tile_entity = grid.get_tile((1, 1)).unwrap();
    let tile_state = app.world().entity(tile_entity).get::<TileState>().unwrap();

    if let TileState::Empty = tile_state {
        // Correct
    } else {
        panic!("Tile should remain Empty, found {:?}", tile_state);
    }
}