112 lines
3.7 KiB
Lua
112 lines
3.7 KiB
Lua
-- Wayside altars the player can pray at for a permanent boon at a gold price.
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-- A shrine's favor wears thin with use: each prayer at the same altar is more
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-- likely to backfire into a curse than the last, so greedily re-praying at a
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-- single shrine is a real risk rather than a free stat pump. Shrines are plain
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-- data on level.shrines, keyed by position, so they serialize like traps and
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-- hazards do with no special save-format handling.
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local Status = require("status")
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local Curses = require("curses")
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local Shrines = {}
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Shrines.WAR = "war"
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Shrines.VITALITY = "vitality"
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Shrines.WISDOM = "wisdom"
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Shrines.FORTUNE = "fortune"
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-- Fixed order so a given rng draw always names the same kind.
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Shrines.order = { Shrines.WAR, Shrines.VITALITY, Shrines.WISDOM, Shrines.FORTUNE }
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Shrines.names = {
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[Shrines.WAR] = "shrine of war",
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[Shrines.VITALITY] = "shrine of vitality",
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[Shrines.WISDOM] = "shrine of wisdom",
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[Shrines.FORTUNE] = "shrine of fortune",
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}
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local BASE_COST = 20
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local COST_STEP = 10
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-- Prayer cost climbs with prior use at this specific altar, the same shape as
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-- its rising curse risk: the shrine asks more and gives worse odds once its
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-- patience with the petitioner is spent.
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function Shrines.costFor(shrine)
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return BASE_COST + shrine.uses * COST_STEP
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end
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-- Numerator over a denominator of 6: the first prayer risks 1-in-6, climbing
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-- by one for every prior use, capped at a certainty of 6-in-6.
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function Shrines.curseChance(shrine)
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return math.min(shrine.uses + 1, 6), 6
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end
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local function grantBlessing(player, kind)
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if kind == Shrines.WAR then
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player.attack = player.attack + 1
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player.baseAttack = player.baseAttack + 1
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return "your grip tightens with martial favor"
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elseif kind == Shrines.VITALITY then
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player.maxHp = player.maxHp + 5
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player.hp = player.hp + 5
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return "vigor floods through you"
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elseif kind == Shrines.WISDOM then
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player.maxMana = player.maxMana + 3
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player.mana = player.maxMana
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return "arcane insight fills your mind"
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else
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local cleansed = false
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local kept = {}
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for _, active in ipairs(player.statuses) do
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if active.kind == Status.POISON or active.kind == Status.BURNING
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or active.kind == Status.WEAKEN or active.kind == Status.SLOW then
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cleansed = true
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else
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kept[#kept + 1] = active
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end
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end
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player.statuses = kept
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Status.apply(player, Status.SHIELD, 10, 1)
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if Curses.cleanseWorn(player) > 0 then cleansed = true end
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if cleansed then
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return "fortune cleanses your ailments and wards you"
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end
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return "fortune wards you against harm"
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end
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end
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local function inflictCurse(player)
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Status.apply(player, Status.WEAKEN, 8, 1)
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Status.apply(player, Status.SLOW, 8, 1)
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return "the shrine's favor turns against you"
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end
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-- Attempts a prayer at `shrine` for `game.player`. When the price cannot be
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-- met nothing is spent and this returns (false, lines). Otherwise the gold is
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-- always spent, the shrine's use count always advances (so its price and
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-- curse odds keep climbing), and this returns (true, lines) describing
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-- whichever of a blessing or a curse landed.
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function Shrines.pray(game, shrine)
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local player = game.player
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local cost = Shrines.costFor(shrine)
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if player.gold < cost then
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return false, { "you cannot afford " .. Shrines.names[shrine.kind] .. "'s price" }
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end
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player.gold = player.gold - cost
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local numerator, denominator = Shrines.curseChance(shrine)
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local cursed = game.rng:chance(numerator, denominator)
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shrine.uses = shrine.uses + 1
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local line
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if cursed then
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line = inflictCurse(player)
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else
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line = grantBlessing(player, shrine.kind)
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end
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return true, {
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string.format("you pray at the %s for %d gold", Shrines.names[shrine.kind], cost),
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line,
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}
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end
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return Shrines
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