mod enums;
mod menu;
mod tooltip;

use std::cmp::Ordering;

use ::rltk::{Point, Rltk, RGB};
use ::specs::prelude::*;
pub use enums::*;
pub use menu::*;
use tooltip::draw_tooltips;

use crate::components::{
    Attribute, Attributes, Consumable, CursedItem, Duration, Equipped, HungerClock, HungerState,
    InBackpack, KnownSpells, MagicItem, MagicItemClass, Name, ObfuscatedName, Pools, StatusEffect,
    Viewshed, Weapon,
};
use crate::game_log::GameLog;
use crate::{camera, colors, Map, MasterDungeonMap, State};

pub fn get_item_color(ecs: &World, item: Entity) -> RGB {
    let dm = ecs.fetch::<crate::map::MasterDungeonMap>();

    // If the item is cursed, and you have identified it, display it in red
    if let Some(name) = ecs.read_storage::<Name>().get(item) {
        if ecs.read_storage::<CursedItem>().get(item).is_some()
            && dm.identified_items.contains(&name.name)
        {
            return colors::RED;
        }
    }

    if let Some(magic) = ecs.read_storage::<MagicItem>().get(item) {
        return match magic.class {
            MagicItemClass::Common => colors::EQUIP_COMMON,
            MagicItemClass::Rare => colors::EQUIP_RARE,
            MagicItemClass::Legendary => colors::EQUIP_LEGEND,
        };
    }

    colors::WHITE
}

pub fn get_item_display_name(ecs: &World, item: Entity) -> String {
    if let Some(name) = ecs.read_storage::<Name>().get(item) {
        if ecs.read_storage::<MagicItem>().get(item).is_some() {
            let dm = ecs.fetch::<MasterDungeonMap>();
            if dm.identified_items.contains(&name.name) {
                if let Some(c) = ecs.read_storage::<Consumable>().get(item) {
                    if c.max_charges > 1 {
                        format!("{} ({})", name.name.clone(), c.charges)
                    } else {
                        name.name.clone()
                    }
                } else {
                    name.name.clone()
                }
            } else if let Some(obfuscated) = ecs.read_storage::<ObfuscatedName>().get(item) {
                obfuscated.name.clone()
            } else {
                "Unidentified magic item".to_string()
            }
        } else {
            name.name.clone()
        }
    } else {
        "Nameless item (bug)".to_string()
    }
}

pub fn draw_hollow_box(
    console: &mut Rltk,
    sx: i32,
    sy: i32,
    width: i32,
    height: i32,
    fg: RGB,
    bg: RGB,
) {
    use rltk::to_cp437;

    console.set(sx, sy, fg, bg, to_cp437('┌'));
    console.set(sx + width, sy, fg, bg, to_cp437('┐'));
    console.set(sx, sy + height, fg, bg, to_cp437('└'));
    console.set(sx + width, sy + height, fg, bg, to_cp437('┘'));

    for x in sx + 1..sx + width {
        console.set(x, sy, fg, bg, to_cp437('─'));
        console.set(x, sy + height, fg, bg, to_cp437('─'));
    }
    for y in sy + 1..sy + height {
        console.set(sx, y, fg, bg, to_cp437('│'));
        console.set(sx + width, y, fg, bg, to_cp437('│'));
    }
}

pub fn draw_ui(ecs: &World, ctx: &mut Rltk) {
    use rltk::to_cp437;

    draw_hollow_box(ctx, 0, 0, 79, 59, colors::BOX_GRAY, colors::BLACK); // Overall box
    draw_hollow_box(ctx, 0, 0, 49, 45, colors::BOX_GRAY, colors::BLACK); // Map box
    draw_hollow_box(ctx, 0, 45, 79, 14, colors::BOX_GRAY, colors::BLACK); // Log box
    draw_hollow_box(ctx, 49, 0, 30, 8, colors::BOX_GRAY, colors::BLACK); // Top-right panel

    ctx.set(0, 45, colors::BOX_GRAY, colors::BLACK, to_cp437('├'));
    ctx.set(49, 8, colors::BOX_GRAY, colors::BLACK, to_cp437('├'));
    ctx.set(49, 0, colors::BOX_GRAY, colors::BLACK, to_cp437('┬'));
    ctx.set(49, 45, colors::BOX_GRAY, colors::BLACK, to_cp437('┴'));
    ctx.set(79, 8, colors::BOX_GRAY, colors::BLACK, to_cp437('┤'));
    ctx.set(79, 45, colors::BOX_GRAY, colors::BLACK, to_cp437('┤'));

    // Draw the town name
    let map = ecs.fetch::<Map>();
    let name_length = map.name.len() + 2;
    let x_pos = (22 - (name_length / 2)) as i32;
    ctx.set(x_pos, 0, colors::BOX_GRAY, colors::BLACK, to_cp437('┤'));
    ctx.set(
        x_pos + name_length as i32,
        0,
        colors::BOX_GRAY,
        colors::BLACK,
        to_cp437('├'),
    );
    ctx.print_color(x_pos + 1, 0, colors::WHITE, colors::BLACK, &map.name);
    std::mem::drop(map);

    // Draw stats
    let player_entity = ecs.fetch::<Entity>();
    let pools = ecs.read_storage::<Pools>();
    let player_pools = pools.get(*player_entity).unwrap();
    let health = format!(
        "Health: {}/{}",
        player_pools.hit_points.current, player_pools.hit_points.max
    );
    let mana = format!(
        "Mana:   {}/{}",
        player_pools.mana.current, player_pools.mana.max
    );
    let xp = format!("Level: {}", player_pools.level);
    ctx.print_color(50, 1, colors::WHITE, colors::BLACK, &health);
    ctx.print_color(50, 2, colors::WHITE, colors::BLACK, &mana);
    ctx.print_color(50, 3, colors::WHITE, colors::BLACK, &xp);
    ctx.draw_bar_horizontal(
        64,
        1,
        14,
        player_pools.hit_points.current,
        player_pools.hit_points.max,
        colors::RED,
        colors::BLACK,
    );
    ctx.draw_bar_horizontal(
        64,
        2,
        14,
        player_pools.mana.current,
        player_pools.mana.max,
        colors::BLUE,
        colors::BLACK,
    );
    let xp_level_start = (player_pools.level - 1) * 1000;
    ctx.draw_bar_horizontal(
        64,
        3,
        14,
        player_pools.xp - xp_level_start,
        1000,
        colors::GOLD,
        colors::BLACK,
    );

    // Attributes
    let attributes = ecs.read_storage::<Attributes>();
    let attr = attributes.get(*player_entity).unwrap();
    draw_attribute("Might:", &attr.might, 4, ctx);
    draw_attribute("Quickness:", &attr.quickness, 5, ctx);
    draw_attribute("Fitness:", &attr.fitness, 6, ctx);
    draw_attribute("Intelligence:", &attr.intelligence, 7, ctx);

    // Initiative and weight
    ctx.print_color(
        50,
        9,
        colors::WHITE,
        colors::BLACK,
        &format!(
            "{:.0} lbs ({} lbs max)",
            player_pools.total_weight,
            (attr.might.base + attr.might.modifiers) * 15
        ),
    );
    ctx.print_color(
        50,
        10,
        colors::WHITE,
        colors::BLACK,
        &format!(
            "Initiative Penalty: {:.0}",
            player_pools.total_initiative_penalty
        ),
    );
    ctx.print_color(
        50,
        11,
        colors::GOLD,
        colors::BLACK,
        &format!("Gold: {:.1}", player_pools.gold),
    );

    // Equipped
    let mut y = 13;
    let entities = ecs.entities();
    let equipped = ecs.read_storage::<Equipped>();
    let weapon = ecs.read_storage::<Weapon>();
    for (entity, equipped_by) in (&entities, &equipped).join() {
        if equipped_by.owner == *player_entity {
            let name = get_item_display_name(ecs, entity);
            ctx.print_color(50, y, get_item_color(ecs, entity), colors::BLACK, &name);
            y += 1;

            if let Some(weapon) = weapon.get(entity) {
                let mut weapon_info = if weapon.damage_bonus < 0 {
                    format!(
                        "┤ {} ({}d{}{})",
                        &name, weapon.damage_n_dice, weapon.damage_die_type, weapon.damage_bonus
                    )
                } else if weapon.damage_bonus == 0 {
                    format!(
                        "┤ {} ({}d{})",
                        &name, weapon.damage_n_dice, weapon.damage_die_type
                    )
                } else {
                    format!(
                        "┤ {} ({}d{}+{})",
                        &name, weapon.damage_n_dice, weapon.damage_die_type, weapon.damage_bonus
                    )
                };

                if let Some(range) = weapon.range {
                    weapon_info += &format!(" (range: {}, F to fire)", range);
                }
                weapon_info += " ├";
                ctx.print_color(3, 45, colors::YELLOW, colors::BLACK, &weapon_info);
            }
        }
    }

    // Consumables
    y += 1;
    let consumables = ecs.read_storage::<Consumable>();
    let backpack = ecs.read_storage::<InBackpack>();
    let mut index = 1;
    for (entity, carried_by, _consumable) in (&entities, &backpack, &consumables).join() {
        if carried_by.owner == *player_entity && index < 10 {
            ctx.print_color(50, y, colors::YELLOW, colors::BLACK, &format!("↑{}", index));
            ctx.print_color(
                53,
                y,
                get_item_color(ecs, entity),
                colors::BLACK,
                &get_item_display_name(ecs, entity),
            );
            y += 1;
            index += 1;
        }
    }

    // Spells
    y += 1;
    let known_spells_storage = ecs.read_storage::<KnownSpells>();
    let known_spells = &known_spells_storage.get(*player_entity).unwrap().spells;
    let mut index = 1;
    for spell in known_spells.iter() {
        ctx.print_color(50, y, colors::CYAN, colors::BLACK, &format!("^{}", index));
        ctx.print_color(
            53,
            y,
            colors::CYAN,
            colors::BLACK,
            &format!("{} ({})", spell.display_name, spell.mana_cost),
        );
        index += 1;
        y += 1;
    }

    // Status
    y = 44;
    let hunger = ecs.read_storage::<HungerClock>();
    let hc = hunger.get(*player_entity).unwrap();
    match hc.state {
        HungerState::WellFed => {
            ctx.print_color(50, y, colors::GREEN, colors::BLACK, "Well Fed");
            y -= 1;
        }
        HungerState::Normal => {}
        HungerState::Hungry => {
            ctx.print_color(50, y, colors::ORANGE, colors::BLACK, "Hungry");
            y -= 1;
        }
        HungerState::Starving => {
            ctx.print_color(50, y, colors::RED, colors::BLACK, "Starving");
            y -= 1;
        }
    }
    let statuses = ecs.read_storage::<StatusEffect>();
    let durations = ecs.read_storage::<Duration>();
    let names = ecs.read_storage::<Name>();
    for (status, duration, name) in (&statuses, &durations, &names).join() {
        if status.target == *player_entity {
            ctx.print_color(
                50,
                y,
                colors::RED,
                colors::BLACK,
                &format!("{} ({})", name.name, duration.turns),
            );
            y -= 1;
        }
    }

    // Draw the log
    let log = ecs.fetch::<GameLog>();
    let mut y = 46;
    for s in log.entries.iter().rev() {
        if y < 59 {
            ctx.print(2, y, s);
        }
        y += 1;
    }

    draw_tooltips(ecs, ctx);
}

fn draw_attribute(name: &str, attribute: &Attribute, y: i32, ctx: &mut Rltk) {
    ctx.print_color(50, y, colors::ATTR_GRAY, colors::BLACK, name);

    let color = match attribute.modifiers.cmp(&0) {
        Ordering::Less => colors::RED,
        Ordering::Equal => colors::WHITE,
        Ordering::Greater => colors::GREEN,
    };

    ctx.print_color(
        67,
        y,
        color,
        colors::BLACK,
        &format!("{}", attribute.base + attribute.modifiers),
    );
    ctx.print_color(73, y, color, colors::BLACK, &format!("{}", attribute.bonus));

    if attribute.bonus > 0 {
        ctx.set(72, y, color, colors::BLACK, rltk::to_cp437('+'));
    }
}

pub fn ranged_target(
    gs: &mut State,
    ctx: &mut Rltk,
    range: i32,
) -> (ItemMenuResult, Option<Point>) {
    let (min_x, max_x, min_y, max_y) = camera::get_screen_bounds(&gs.ecs, ctx);
    let player_entity = gs.ecs.fetch::<Entity>();
    let player_pos = gs.ecs.fetch::<Point>();
    let viewsheds = gs.ecs.read_storage::<Viewshed>();

    ctx.print_color(5, 0, colors::YELLOW, colors::BLACK, "Select Target:");

    // Highlight available target cells
    let mut available_cells = Vec::new();
    if let Some(visible) = viewsheds.get(*player_entity) {
        for idx in visible.visible_tiles.iter() {
            let distance = rltk::DistanceAlg::Pythagoras.distance2d(*player_pos, *idx);
            if distance <= range as f32 {
                let screen_x = idx.x - min_x;
                let screen_y = idx.y - min_y;

                if screen_x > 1
                    && screen_x < (max_x - min_x) - 1
                    && screen_y > 1
                    && screen_y < (max_y - min_y) - 1
                {
                    ctx.set_bg(screen_x, screen_y, colors::BLUE);
                    available_cells.push(idx);
                }
            }
        }
    } else {
        return (ItemMenuResult::Cancel, None);
    }

    // Draw mouse cursor
    let mouse_pos = ctx.mouse_pos();
    let mut mouse_map_pos = mouse_pos;
    mouse_map_pos.0 += min_x;
    mouse_map_pos.1 += min_y;
    let mut valid_target = false;
    for idx in available_cells.iter() {
        if idx.x == mouse_map_pos.0 && idx.y == mouse_map_pos.1 {
            valid_target = true;
        }
    }

    if valid_target {
        ctx.set_bg(mouse_pos.0, mouse_pos.1, colors::CYAN);
        if ctx.left_click {
            return (
                ItemMenuResult::Selected,
                Some(Point::new(mouse_map_pos.0, mouse_map_pos.1)),
            );
        }
    } else {
        ctx.set_bg(mouse_pos.0, mouse_pos.1, colors::RED);
        if ctx.left_click {
            return (ItemMenuResult::Cancel, None);
        }
    }

    (ItemMenuResult::NoResponse, None)
}