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Price thresholds
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‎README.md‎

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# Patrician 3 Insights
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## Run Locally
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`mdbook serve`

‎src/towns/ware-prices/thresholds.md‎

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# Thresholds
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A town's price thresholds are updated by the `update_town_price_thresholds` function at `0x00528070` every time the town ticks.
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The calculation is partially understood, but some aspects are still to be determined.
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The following pseudocode denotes what is known:
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```rust
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fn update_town_price_thresholds(town) {
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let mut thresholds = [[0; 4]; 24];
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let mut building_material_factor = 1;
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let mut extra_demand_bitmask = 0;
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let mut t1_days = 14;
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// Consider the town's situation
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if town.flags & (TOWN_FLAG_SIEGE | TOWN_FLAG_BLOCKADE | TOWN_FLAG_PIRATE_ATTACK | TOWN_FLAG_FROZEN) != 0 {
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t1_days = 28;
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building_material_factor = 2;
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extra_demand_bitmask = ware_threshold_bitmask_grain |
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ware_threshold_bitmask_meat |
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ware_threshold_bitmask_fish |
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ware_threshold_bitmask_beer |
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ware_threshold_bitmask_salt |
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ware_threshold_bitmask_honey |
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ware_threshold_bitmask_spices |
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ware_threshold_bitmask_wine |
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ware_threshold_bitmask_timber;
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} else {
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if town.flags & TOWN_FLAG_FIRE != 0 {
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extra_demand_bitmask = ware_threshold_bitmask_grain |
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ware_threshold_bitmask_meat |
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ware_threshold_bitmask_fish |
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ware_threshold_bitmask_beer |
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ware_threshold_bitmask_salt |
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ware_threshold_bitmask_honey |
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ware_threshold_bitmask_spices |
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ware_threshold_bitmask_wine |
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ware_threshold_bitmask_timber;
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} else {
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if town.flags & TOWN_FLAG_FAMINE != 0 {
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extra_demand_bitmask = ware_threshold_bitmask_grain |
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ware_threshold_bitmask_meat |
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ware_threshold_bitmask_fish |
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ware_threshold_bitmask_beer |
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ware_threshold_bitmask_salt |
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ware_threshold_bitmask_honey |
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ware_threshold_bitmask_spices |
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ware_threshold_bitmask_wine;
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} else if own.flags & TOWN_FLAG_FAMINE != 0 {
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extra_demand_bitmask = ware_threshold_bitmask_grain |
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ware_threshold_bitmask_meat |
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ware_threshold_bitmask_fish |
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ware_threshold_bitmask_beer |
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ware_threshold_bitmask_salt |
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ware_threshold_bitmask_honey |
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ware_threshold_bitmask_spices;
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}
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}
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}
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// Initialize t0 and t1 (for normale wares except bricks)
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for (_, threshold) in thresholds.iter_mut().enumerate().take(19) {
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let t0_days = if extra_demand_bitmask & 1 != 0 { 14 } else { 7 };
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threshold[0] = t0_days;
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threshold[1] = t0_days + t1_days;
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extra_demand_bitmask >>= 1;
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}
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// Initialize t0 and t1 for the rest
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thresholds[WareId::Bricks][0] = 0;
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thresholds[WareId::Brick][1] = 0;
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thresholds[WareId::Sword][0] = 0;
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thresholds[WareId::Sword][1] = 0;
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thresholds[WareId::Bow][0] = 0;
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thresholds[WareId::Bow][1] = 0;
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thresholds[WareId::Crossbow][0] = 0;
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thresholds[WareId::Crossbow][1] = 0;
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thresholds[WareId::Carbine][0] = 0;
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thresholds[WareId::Carbine][1] = 0;
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// Grain t1 bonus
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thresholds[WareId::Grain][1] += t1_days;
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// Scale t0 and t1 with consumption
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for (i, threshold) in thresholds.iter_mut().enumerate().take(20) {
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let consumption = town.consumption_businesses[i]
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+ town.consumption_citizens[i]
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+ 1;
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threshold[0] *= consumption;
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threshold[1] *= consumption;
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}
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// Siege pitch bonus
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if town.flags & TOWN_FLAG_SIEGE {
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thresholds[WareId::Pitch][0] += 7 * town.get_siege_pitch_consumption();
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thresholds[WareId::Pitch][1] += 14 * town.get_siege_pitch_consumption();
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}
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// Seasonal t1 boni
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match now().month {
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Month::September => { // 0.15
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thresholds[WareId::Grain][1] += thresholds[WareId::Grain][1] * 3 / 20;
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thresholds[WareId::Wine][1] += thresholds[WareId::Wine][1] * 3 / 20;
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}
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Month::October => { // 0.3
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thresholds[WareId::Grain as usize][1] += thresholds[WareId::Grain as usize][1] * 3 / 10;
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thresholds[WareId::Wine as usize][1] += thresholds[WareId::Wine as usize][1] * 3 / 10;
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}
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Month::November => { // 0.2
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thresholds[WareId::Grain as usize][1] += thresholds[WareId::Grain as usize][1] / 5;
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thresholds[WareId::Wine as usize][1] += thresholds[WareId::Wine as usize][1] / 5;
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}
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Month::December => { // 0.1
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thresholds[WareId::Grain as usize][1] += thresholds[WareId::Grain as usize][1] / 10;
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thresholds[WareId::Wine as usize][1] += thresholds[WareId::Wine as usize][1] / 10;
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}
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_ => {}
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}
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// Building material boni
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thresholds[WareId::Pitch][0] += 1800;
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thresholds[WareId::Bricks][0] += 80000 * building_material_factor;
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thresholds[WareId::Timber][0] += 42000;
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thresholds[WareId::Timber][1] += 84000;
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thresholds[WareId::Bricks][1] += 160000 * building_material_factor;
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thresholds[WareId::Pitch][1] += 3600;
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thresholds[WareId::Hemp][0] += 5000 * building_material_factor;
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thresholds[WareId::IronGoods][0] += 2000 * building_material_factor;
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thresholds[WareId::IronGoods][1] += 4000 * building_material_factor;
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/*
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TODO: Weapons
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let mut scaled_citizens = 10 * town.citizens_total / 200;
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if town.flags & (TOWN_FLAG_SIEGE | TOWN_FLAG_PIRATE_ATTACK) != 0 {
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scaled_citizens *= 2;
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}
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*/
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// Set t2 and t3 except for bricks and weapons
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for i in 0..19 {
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thresholds[i][2] = thresholds[i][1] + 10 * town.unidentified_array[i];
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thresholds[i][3] = thresholds[i][2] + thresholds[i][0];
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}
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// Pitch and bricks production bonus
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if town.production[WareId::Pitch] > 0 {
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thresholds[WareId::Pitch][3] += 3600;
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}
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if town.production[WareId::Bricks] > 0 {
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thresholds[WareId::Bricks][3] += 160000;
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}
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// Clothes bonus
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thresholds[WareId::Cloth][0] += 400;
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thresholds[WareId::Cloth][1] += 800;
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thresholds[WareId::Cloth][2] += 800;
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thresholds[WareId::Cloth][3] += 1600;
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// Bricks t2 and t3
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if has_effective_bricks_production {
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thresholds[WareId::Bricks][2] = thresholds[WareId::Bricks][1] + town.unidentified_array[WareId::Bricks];
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thresholds[WareId::Bricks][3] = thresholds[WareId::Bricks][1] + 2 * town.unidentified_array[WareId::Bricks];
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} else if thresholds[WareId::Bricks][2] > 2 * thresholds[WareId::Bricks][1] {
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// TODO: can this every be true?
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thresholds[WareId::Bricks][2] = 2 * thresholds[WareId::Bricks][1];
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thresholds[WareId::Bricks][3] = 3 * thresholds[WareId::Bricks][1];
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}
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// Enforce minima
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for (i, threshold) in thresholds.iter_mut().enumerate().take(20) {
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let ware_id = WareId::from_usize(i).unwrap();
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let minimum = if ware_id.is_barrel_ware() {
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1000
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} else {
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10000
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};
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if threshold[0] < minimum {
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threshold[0] = minimum;
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}
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let mut min = minimum + minimum;
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for j in 1..4 {
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if threshold[j] < min {
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threshold[j] = min;
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}
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if threshold[j] <= threshold[j - 1] {
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threshold[j] = threshold[j - 1] + minimum;
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}
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min += minimum;
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}
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}
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}
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```

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