flatland_client_lib/

character_sheet.rs

//! Character sheet model for the `i` stats overlay (gfx + TUI).

use flatland_protocol::{
    EncumbranceState, LifeState, PrimaryAttributes, ProgressionCurve,
    PRIMARY_STAT_ROWS, SKILL_ROWS,
};

use crate::{body_slot_label, GameState};

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum SheetSync {
    /// XP pools on the wire — bars are authoritative.
    Full,
    /// Attributes/skills only; reconnect or server update needed.
    MissingXpPools,
}

#[derive(Debug, Clone)]
pub struct CharacterSheet {
    pub sync: SheetSync,
    pub name: String,
    pub position: (f32, f32, f32),
    pub inside_building: Option<String>,
    pub life: String,
    pub deaths: u32,
    pub money: String,
    pub attributes: Vec<AttributeRow>,
    pub skills: Vec<SkillRow>,
    pub derived_attack: f32,
    pub derived_spell: f32,
    pub derived_evasion: f32,
    pub derived_carry_kg: f32,
    pub derived_sight_m: f32,
    pub derived_fov_deg: f32,
    pub pools: Vec<PoolRow>,
    pub carry_mass: f32,
    pub carry_mass_max: f32,
    pub encumbrance: &'static str,
    pub mainhand: String,
    pub worn: Vec<(String, String)>,
    pub keychain_count: usize,
    pub in_combat: bool,
    pub auto_attack: bool,
    pub blocking: bool,
    pub target_slots: u8,
    pub has_los: bool,
    pub target_label: Option<String>,
    pub weapon_ability: Option<String>,
    pub rotation_summary: Option<String>,
    pub blueprint_count: usize,
    pub footer_hints: Vec<String>,
}

#[derive(Debug, Clone)]
pub struct AttributeRow {
    pub label: &'static str,
    pub level: u16,
    pub next_level: u16,
    pub progress: f32,
    pub xp_into_band: f64,
    pub xp_band_size: f64,
    pub xp_to_next: f64,
    pub pool_xp: f64,
    pub above_baseline: f64,
}

#[derive(Debug, Clone)]
pub struct SkillRow {
    pub name: &'static str,
    pub tier: u16,
    pub next_tier: u16,
    pub progress: f32,
    pub xp_into_band: f64,
    pub xp_band_size: f64,
    pub xp_to_next: f64,
    pub pool_xp: f64,
}

#[derive(Debug, Clone)]
pub struct PoolRow {
    pub label: &'static str,
    pub current: f32,
    pub max: f32,
}

pub fn build_character_sheet(state: &GameState) -> CharacterSheet {
    let curve = state.progression_curve.unwrap_or_default();
    let bootstrap_primary = curve.xp_for_display_level(curve.baseline_display as f64);
    let player = state.player.as_ref();
    let attrs = player.and_then(|p| p.attributes);
    let skills = player.and_then(|p| p.skills.as_ref());
    let xp = player.and_then(|p| p.progression_xp.as_ref());
    let sync = if xp.is_some() {
        SheetSync::Full
    } else {
        SheetSync::MissingXpPools
    };

    let attributes = if let (Some(attrs), Some(xp)) = (attrs, xp) {
        PRIMARY_STAT_ROWS
            .iter()
            .map(|(label, pool)| {
                let pool_xp = pool(xp);
                let level = PrimaryAttributes::display(flatland_protocol::primary_internal(
                    &attrs, label,
                ));
                let next_level = level.saturating_add(1);
                let prog = curve.band_progress(pool_xp, level, next_level);
                AttributeRow {
                    label,
                    level,
                    next_level: prog.next,
                    progress: prog.progress as f32,
                    xp_into_band: prog.xp_into_level,
                    xp_band_size: (prog.xp_ceiling - prog.xp_floor).max(0.0),
                    xp_to_next: prog.xp_to_next,
                    pool_xp,
                    above_baseline: pool_xp - bootstrap_primary,
                }
            })
            .collect()
    } else if let Some(attrs) = attrs {
        PRIMARY_STAT_ROWS
            .iter()
            .map(|(label, _)| AttributeRow {
                label,
                level: PrimaryAttributes::display(flatland_protocol::primary_internal(
                    &attrs, label,
                )),
                next_level: 0,
                progress: 0.0,
                xp_into_band: 0.0,
                xp_band_size: 0.0,
                xp_to_next: 0.0,
                pool_xp: 0.0,
                above_baseline: 0.0,
            })
            .collect()
    } else {
        Vec::new()
    };

    let skills = if let (Some(skills), Some(xp)) = (skills, xp) {
        let mut rows: Vec<SkillRow> = SKILL_ROWS
            .iter()
            .map(|(name, pool, tier_fn)| {
                let pool_xp = pool(xp);
                let tier = tier_fn(skills);
                let next_tier = tier.saturating_add(1).min(10);
                let current_display = if tier == 0 { 0 } else { tier.saturating_mul(10) };
                let next_display = if next_tier >= 10 {
                    100
                } else {
                    next_tier.saturating_mul(10)
                };
                let prog = curve.band_progress(pool_xp, current_display, next_display);
                SkillRow {
                    name,
                    tier,
                    next_tier,
                    progress: prog.progress as f32,
                    xp_into_band: prog.xp_into_level,
                    xp_band_size: (prog.xp_ceiling - prog.xp_floor).max(0.0),
                    xp_to_next: prog.xp_to_next,
                    pool_xp,
                }
            })
            .collect();
        rows.sort_by(|a, b| {
            b.pool_xp
                .partial_cmp(&a.pool_xp)
                .unwrap_or(std::cmp::Ordering::Equal)
        });
        rows
    } else if let Some(skills) = skills {
        SKILL_ROWS
            .iter()
            .map(|(name, _, tier_fn)| SkillRow {
                name,
                tier: tier_fn(skills),
                next_tier: 0,
                progress: 0.0,
                xp_into_band: 0.0,
                xp_band_size: 0.0,
                xp_to_next: 0.0,
                pool_xp: 0.0,
            })
            .collect()
    } else {
        Vec::new()
    };

    let derived = attrs.map(|a| a.derived_preview());
    let pools = state
        .vitals()
        .map(|v| {
            vec![
                PoolRow {
                    label: "Health",
                    current: v.health,
                    max: v.health_max,
                },
                PoolRow {
                    label: "Mana",
                    current: v.mana,
                    max: v.mana_max,
                },
                PoolRow {
                    label: "Stamina",
                    current: v.stamina,
                    max: v.stamina_max,
                },
                PoolRow {
                    label: "Hunger",
                    current: v.hunger,
                    max: v.hunger_max,
                },
                PoolRow {
                    label: "Thirst",
                    current: v.thirst,
                    max: v.thirst_max,
                },
            ]
        })
        .unwrap_or_default();

    let (px, py, pz) = state.player_position_with_z();
    let mut footer_hints = training_hints(&attributes, sync, &curve);
    if let Some(top) = most_trained_attribute(&attributes) {
        if top.above_baseline > 0.0001 {
            footer_hints.insert(
                0,
                format!(
                    "Most trained primary: {} ({} above baseline)",
                    top.label,
                    format_xp_delta(top.above_baseline)
                ),
            );
        }
    }
    if let Some(top) = skills.iter().find(|s| s.pool_xp > 0.0001) {
        footer_hints.insert(
            0,
            format!(
                "Most trained skill: {} ({} XP)",
                top.name,
                format_xp_value(top.pool_xp)
            ),
        );
    }

    CharacterSheet {
        sync,
        name: player.map(|p| p.label.clone()).unwrap_or_else(|| "—".into()),
        position: (px, py, pz),
        inside_building: player.and_then(|p| p.inside_building.clone()),
        life: state
            .vitals()
            .map(|v| match v.life_state {
                LifeState::Alive => "alive".into(),
                LifeState::Dead => "dead".into(),
            })
            .unwrap_or_else(|| "—".into()),
        deaths: state.vitals().map(|v| v.deaths).unwrap_or(0),
        money: state.currency_display(),
        attributes,
        skills,
        derived_attack: derived.map(|d| d.attack_power).unwrap_or(0.0),
        derived_spell: derived.map(|d| d.spell_power).unwrap_or(0.0),
        derived_evasion: derived.map(|d| d.evasion).unwrap_or(0.0),
        derived_carry_kg: derived.map(|d| d.carry_mass_max).unwrap_or(state.carry_mass_max),
        derived_sight_m: derived.map(|d| d.sight_range_m).unwrap_or(0.0),
        derived_fov_deg: derived.map(|d| d.fov_deg).unwrap_or(0.0),
        pools,
        carry_mass: state.carry_mass,
        carry_mass_max: state.carry_mass_max,
        encumbrance: match state.encumbrance {
            EncumbranceState::Light => "Light",
            EncumbranceState::Heavy => "Heavy",
            EncumbranceState::Over => "OVER",
        },
        mainhand: state
            .mainhand_label
            .clone()
            .or_else(|| state.mainhand_template_id.clone())
            .unwrap_or_else(|| "(unarmed)".into()),
        worn: state
            .worn
            .iter()
            .map(|(slot, stack)| {
                let label = stack
                    .display_name
                    .clone()
                    .unwrap_or_else(|| stack.template_id.clone());
                (body_slot_label(*slot).to_string(), label)
            })
            .collect(),
        keychain_count: state.keychain_stacks.len(),
        in_combat: state.in_combat,
        auto_attack: state.auto_attack,
        blocking: state.blocking_active,
        target_slots: state.max_target_slots,
        has_los: state.combat_has_los,
        target_label: state.combat_target_label.clone().or_else(|| {
            state
                .combat_target
                .map(|id| format!("entity {id}"))
        }),
        weapon_ability: (!state.weapon_ability_id.is_empty())
            .then(|| state.weapon_ability_id.clone()),
        rotation_summary: (!state.combat_slots.is_empty()).then(|| {
            state
                .combat_slots
                .iter()
                .map(|s| {
                    format!(
                        "T{}={}",
                        s.slot_index,
                        s.preset_id.as_deref().unwrap_or("—")
                    )
                })
                .collect::<Vec<_>>()
                .join("  ")
        }),
        blueprint_count: state.blueprints.len(),
        footer_hints,
    }
}

fn most_trained_attribute<'a>(rows: &'a [AttributeRow]) -> Option<&'a AttributeRow> {
    rows.iter()
        .max_by(|a, b| {
            a.above_baseline
                .partial_cmp(&b.above_baseline)
                .unwrap_or(std::cmp::Ordering::Equal)
        })
        .filter(|r| r.above_baseline > 0.0)
}

fn training_hints(attributes: &[AttributeRow], sync: SheetSync, curve: &ProgressionCurve) -> Vec<String> {
    let mut hints = Vec::new();
    match sync {
        SheetSync::MissingXpPools => {
            hints.push("XP pools missing on wire — reconnect after updating server/client.".into());
        }
        SheetSync::Full => {
            let band = curve.xp_for_display_level((curve.baseline_display + 1) as f64)
                - curve.xp_for_display_level(curve.baseline_display as f64);
            hints.push(format!(
                "Progression is slow by design: ~{:.0} XP per +1 stat at level {} (~{:.0} harvests).",
                band,
                curve.baseline_display,
                band / 0.08
            ));
            hints.push(
                "New characters start with equal primaries. Harvest → STR/STA/Logging; craft → DEX/INT/Crafting; combat → STR/DEX/Swords.".into(),
            );
            let diverged = attributes
                .iter()
                .filter(|r| r.above_baseline.abs() > 0.0001)
                .count();
            if diverged == 0 {
                hints.push(
                    "No stat has moved off baseline yet — keep harvesting, crafting, or fighting to diverge pools.".into(),
                );
            }
        }
    }
    hints
}

pub fn format_xp_band_compact(into: f64, band: f64) -> String {
    if band <= 0.0 {
        return "—".into();
    }
    format!(
        "{}/{}",
        format_xp_value(into),
        format_xp_value(band)
    )
}

pub fn format_xp_band(into: f64, band: f64, to_next: f64, next: u16) -> String {
    if band <= 0.0 {
        return "—".into();
    }
    format!(
        "{}/{} XP · {} to {next}",
        format_xp_value(into),
        format_xp_value(band),
        format_xp_value(to_next),
    )
}

/// Adaptive precision so tiny harvest gains (0.08 XP) don't display as 0.0.
pub fn format_xp_value(v: f64) -> String {
    let abs = v.abs();
    if abs == 0.0 {
        "0".into()
    } else if abs >= 100.0 {
        format!("{:.1}", v)
    } else if abs >= 1.0 {
        format!("{:.2}", v)
    } else if abs >= 0.01 {
        format!("{:.3}", v)
    } else {
        format!("{:.4}", v)
    }
}

/// Signed delta from baseline — always enough decimals to see harvest ticks.
pub fn format_xp_delta(v: f64) -> String {
    let abs = v.abs();
    if abs == 0.0 {
        "0".into()
    } else if abs >= 1.0 {
        format!("{:+.2}", v)
    } else if abs >= 0.01 {
        format!("{:+.3}", v)
    } else {
        format!("{:+.4}", v)
    }
}

pub fn format_progress_pct(progress: f32) -> String {
    let pct = (progress * 100.0) as f64;
    if pct >= 10.0 {
        format!("{pct:.0}%")
    } else if pct >= 0.01 {
        format!("{pct:.2}%")
    } else if pct > 0.0 {
        format!("{pct:.3}%")
    } else {
        "0%".into()
    }
}

pub fn format_pool_xp(pool: f64, above_baseline: f64) -> String {
    if above_baseline.abs() > 0.0001 {
        format!(
            "{} ({})",
            format_xp_value(pool),
            format_xp_delta(above_baseline)
        )
    } else {
        format_xp_value(pool)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use flatland_protocol::{PlayerSkills, PrimaryAttributes, ProgressionXp};

    #[test]
    fn tiny_xp_values_are_not_rounded_to_zero() {
        assert_eq!(format_xp_value(0.08), "0.080");
        assert_eq!(format_xp_delta(0.08), "+0.080");
        assert_eq!(format_xp_band(0.08, 58.65, 58.57, 16), "0.080/58.65 XP · 58.57 to 16");
        assert_eq!(format_xp_band_compact(0.08, 58.65), "0.080/58.65");
        assert_eq!(format_progress_pct(0.0014), "0.14%");
    }

    #[test]
    fn bootstrap_band_is_zero_until_first_gain() {
        let curve = ProgressionCurve::default();
        let xp = ProgressionXp::bootstrap_new(15, curve.xp_base, curve.xp_growth);
        let attrs = PrimaryAttributes::default();
        let sheet = build_character_sheet(&minimal_state(attrs, xp.clone())).attributes;
        let str_row = sheet.iter().find(|r| r.label == "STR").unwrap();
        assert!(str_row.xp_into_band.abs() < 0.001);

        let mut gained = xp;
        gained.strength += 0.08;
        let sheet2 = build_character_sheet(&minimal_state(attrs, gained)).attributes;
        let str2 = sheet2.iter().find(|r| r.label == "STR").unwrap();
        assert!((str2.xp_into_band - 0.08).abs() < 0.001);
        assert!(str2.progress > 0.0);
    }

    #[test]
    fn harvest_diverges_strength_from_intelligence() {
        let curve = ProgressionCurve::default();
        let mut xp = ProgressionXp::bootstrap_new(15, curve.xp_base, curve.xp_growth);
        xp.strength += 1.0;
        let attrs = PrimaryAttributes::default();
        let rows = build_character_sheet(&minimal_state(attrs, xp)).attributes;
        let str_row = rows.iter().find(|r| r.label == "STR").unwrap();
        let int_row = rows.iter().find(|r| r.label == "INT").unwrap();
        assert!(str_row.above_baseline > int_row.above_baseline);
        assert!((str_row.pool_xp - int_row.pool_xp - 1.0).abs() < 0.01);
    }

    fn minimal_state(attrs: PrimaryAttributes, xp: ProgressionXp) -> GameState {
        use flatland_protocol::{EntityState, Transform, Velocity2D, WorldCoord};
        let mut state = GameState {
            session_id: 1,
            entity_id: 1,
            character_id: None,
            tick: 0,
            chunk_rev: 0,
            content_rev: 0,
            publish_rev: 0,
            entities: Vec::new(),
            player: None,
            resource_nodes: Vec::new(),
            ground_drops: Vec::new(),
            placed_containers: Vec::new(),
            buildings: Vec::new(),
            doors: Vec::new(),
            interior_map: None,
            npcs: Vec::new(),
            blueprints: Vec::new(),
            world_width_m: 256.0,
            world_height_m: 256.0,
            terrain_zones: Vec::new(),
            z_platforms: Vec::new(),
            z_transitions: Vec::new(),
            world_clock: flatland_protocol::WorldClock::default(),
            inventory: std::collections::HashMap::new(),
            inventory_hints: std::collections::HashMap::new(),
            logs: std::collections::VecDeque::new(),
            intents_sent: 0,
            ticks_received: 0,
            connected: true,
            disconnect_reason: None,
            show_stats: false,
            show_craft_menu: false,
            craft_menu_index: 0,
            craft_batch_quantity: 1,
            show_shop_menu: false,
            shop_catalog: None,
            shop_tab: crate::ShopTab::Buy,
            shop_menu_index: 0,
            shop_quantity: 1,
            shop_trade_log: std::collections::VecDeque::new(),
            show_npc_verb_menu: false,
            npc_verb_target: None,
            npc_verb_index: 0,
            show_npc_chat: false,
            npc_chat: None,
            show_inventory_menu: false,
            inventory_menu_index: 0,
            show_move_picker: false,
            move_picker_index: 0,
            move_picker: None,
            show_destroy_picker: false,
            destroy_confirm_pending: false,
            destroy_picker: None,
            show_rename_prompt: false,
            rename_buffer: String::new(),
            combat_target: None,
            combat_target_label: None,
            in_combat: false,
            auto_attack: true,
            combat_has_los: false,
            attack_cd_ticks: 0,
            gcd_ticks: 0,
            weapon_ability_id: String::new(),
            mainhand_template_id: None,
            mainhand_label: None,
            worn: std::collections::BTreeMap::new(),
            carry_mass: 0.0,
            carry_mass_max: 37.5,
            encumbrance: flatland_protocol::EncumbranceState::Light,
            inventory_stacks: Vec::new(),
            keychain_stacks: Vec::new(),
            combat_target_detail: None,
            cast_progress: None,
            ability_cooldowns: Vec::new(),
            blocking_active: false,
            max_target_slots: 1,
            combat_slots: Vec::new(),
            rotation_presets: Vec::new(),
            show_loadout_menu: false,
            show_keychain_menu: false,
            keychain_menu_index: 0,
            show_rotation_editor: false,
            rotation_editor: crate::RotationEditorState::default(),
            show_quest_menu: false,
            quest_menu_index: 0,
            quest_withdraw_confirm: false,
            progression_curve: None,
            show_quest_offer: false,
            pending_quest_offer: None,
            interactables: Vec::new(),
            quest_log: Vec::new(),
            harvest_in_progress: false,
            harvest_started_at: None,
            pending_craft_ack: None,
            loadout_menu_index: 0,
        };
        state.player = Some(EntityState {
            id: 1,
            transform: Transform {
                position: WorldCoord::surface(0.0, 0.0),
                yaw: 0.0,
                velocity: Velocity2D { vx: 0.0, vy: 0.0 },
            },
            label: "Hero".into(),
            vitals: Some(flatland_protocol::PlayerVitals::from_attributes(attrs)),
            attributes: Some(attrs),
            skills: Some(PlayerSkills::default()),
            inside_building: None,
            tile_id: None,
            presentation_state: None,
            sprite_mode: None,
            progression_xp: Some(xp),
        });
        state
    }
}