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* Interior Design Cost Calculator — pure functions, no side effects.
* All monetary values in INR (integer rupees).
*/
import { getCellRange, type Tier, type RoomType } from "./hyderabad-calibration";
// ─── Types ────────────────────────────────────────────────────────────────────
export type Zone =
| "west"
| "central"
| "east"
| "south"
| "north"
| "old-city";
export type Scope =
| "kitchen-only"
| "living-kitchen"
| "full-home"
| "custom";
export type BHK = 1 | 2 | 3 | 4 | 5;
export interface CalculatorInputs {
bhk: BHK;
tier: Tier;
scope: Scope;
zone: Zone;
/** locality ID from taxonomy, e.g. "loc_gachibowli" — display only */
locality: string;
vastu: boolean;
}
export interface RoomEstimate {
label: string;
low: number;
high: number;
}
export interface Estimate {
rangeLow: number;
rangeHigh: number;
typical: number;
byRoom: RoomEstimate[];
/** [min, max] weeks */
timelineWeeks: [number, number];
included: string[];
notIncluded: string[];
}
// ─── Zone multipliers ─────────────────────────────────────────────────────────
// Calibrated against Hyderabad market: Central premium areas cost ~30% more
// than South (base). Old City slightly below South due to logistics & access.
const ZONE_MULTIPLIER: Record<Zone, number> = {
central: 1.3,
west: 1.15,
south: 1.0,
east: 0.9,
north: 0.9,
"old-city": 0.85,
};
// ─── Vastu premium ────────────────────────────────────────────────────────────
// Vastu-compliant design adds ~8% for the extra design consultation & material
// adjustments (specific wood orientations, colour choices, false wall additions).
const VASTU_MULTIPLIER = 1.08;
// ─── Rooms included per scope × BHK ──────────────────────────────────────────
// Returns the list of room types to price for a given scope + BHK.
function roomsForScope(scope: Scope, bhk: BHK): RoomType[] {
if (scope === "kitchen-only") return ["kitchen"];
if (scope === "living-kitchen") return ["living", "kitchen", "dining"];
// full-home and custom: all applicable rooms
const rooms: RoomType[] = [
"kitchen",
"living",
"dining",
"master_bedroom",
"pooja",
"utility",
];
// Additional bedrooms beyond master
const extraBedrooms = Math.max(0, bhk - 1);
for (let i = 0; i < extraBedrooms; i++) rooms.push("bedroom");
// Bathrooms: 1BHK = 1, 2BHK = 2, 3BHK = 2, 4BHK = 3, 5BHK = 4
const bathroomCount = bhk === 1 ? 1 : bhk === 2 ? 2 : bhk === 3 ? 2 : bhk === 4 ? 3 : 4;
for (let i = 0; i < bathroomCount; i++) rooms.push("bathroom");
return rooms;
}
function roomLabel(room: RoomType, index: number): string {
const labels: Record<RoomType, string> = {
kitchen: "Kitchen",
living: "Living Room",
dining: "Dining Area",
master_bedroom: "Master Bedroom",
bedroom: "Bedroom",
bathroom: "Bathroom",
pooja: "Pooja Room",
utility: "Utility Area",
};
// disambiguate repeated rooms (e.g. "Bedroom 2", "Bathroom 2")
if (index > 0) return `${labels[room]} ${index + 1}`;
return labels[room];
}
// ─── Timeline by scope × tier ─────────────────────────────────────────────────
// Weeks from design sign-off to handover. Does not include civil work.
function timelineFor(scope: Scope, tier: Tier): [number, number] {
if (scope === "kitchen-only") {
return tier === "luxury" ? [4, 8] : tier === "premium" ? [3, 6] : [2, 4];
}
if (scope === "living-kitchen") {
return tier === "luxury" ? [8, 14] : tier === "premium" ? [6, 10] : [4, 8];
}
// full-home / custom
if (tier === "luxury") return [16, 26];
if (tier === "premium") return [12, 20];
Eif (tier === "comfort") return [10, 16];
return [8, 12];
}
// ─── Included / not-included bullets ─────────────────────────────────────────
function inclusionBullets(
tier: Tier,
scope: Scope,
): { included: string[]; notIncluded: string[] } {
const base = [
"Design consultation & 3D visualisations",
"All furniture & woodwork mentioned in scope",
"Hardware (hinges, channels) — branded per tier",
"Installation & labour",
];
const tierExtras: Record<Tier, string[]> = {
essentials: [],
comfort: ["False ceiling in living & master bedroom", "Modular kitchen with chimney + hob"],
premium: [
"False ceiling throughout",
"Wall panelling in living + master",
"Branded kitchen appliances (Faber/Elica)",
],
luxury: [
"Designer tiles & imported finishes",
"Smart lighting (Philips Hue or equivalent)",
"Full appliance package (built-in oven, dishwasher)",
"3D walkthrough video before execution",
],
};
const included = [...base, ...tierExtras[tier]];
const notIncluded = [
"Civil work (demolition, flooring, tiling, painting)",
"Electrical & plumbing rewiring",
"AC units & white goods (unless specified)",
"GST (18% on design fees)",
];
if (scope !== "full-home" && scope !== "custom") {
notIncluded.push("Rooms not in selected scope");
}
return { included, notIncluded };
}
// ─── Core compute ─────────────────────────────────────────────────────────────
export function computeEstimate(inputs: CalculatorInputs): Estimate {
const { bhk, tier, scope, zone, vastu } = inputs;
const zoneMult = ZONE_MULTIPLIER[zone];
const vastuMult = vastu ? VASTU_MULTIPLIER : 1.0;
const rooms = roomsForScope(scope, bhk);
// Track how many times each room type has appeared (for labelling)
const roomOccurrences: Partial<Record<RoomType, number>> = {};
const byRoom: RoomEstimate[] = rooms.map((room) => {
const occurrence = roomOccurrences[room] ?? 0;
roomOccurrences[room] = occurrence + 1;
const [rawLow, rawHigh] = getCellRange(bhk, tier, room);
const low = Math.round(rawLow * zoneMult * vastuMult);
const high = Math.round(rawHigh * zoneMult * vastuMult);
return { label: roomLabel(room, occurrence), low, high };
});
const rangeLow = byRoom.reduce((sum, r) => sum + r.low, 0);
const rangeHigh = byRoom.reduce((sum, r) => sum + r.high, 0);
// Typical is a weighted median — roughly 40% of the way from low to high
// (consistent with Indian market skewing towards lower-end of tier)
const typical = Math.round(rangeLow + (rangeHigh - rangeLow) * 0.4);
const timelineWeeks = timelineFor(scope, tier);
const { included, notIncluded } = inclusionBullets(tier, scope);
return { rangeLow, rangeHigh, typical, byRoom, timelineWeeks, included, notIncluded };
}
// ─── URL encode / decode ──────────────────────────────────────────────────────
const VALID_TIERS: Tier[] = ["essentials", "comfort", "premium", "luxury"];
const VALID_ZONES: Zone[] = ["west", "central", "east", "south", "north", "old-city"];
const VALID_SCOPES: Scope[] = ["kitchen-only", "living-kitchen", "full-home", "custom"];
export function encodeInputs(inputs: CalculatorInputs): URLSearchParams {
const p = new URLSearchParams();
p.set("bhk", String(inputs.bhk));
p.set("tier", inputs.tier);
p.set("scope", inputs.scope);
p.set("zone", inputs.zone);
Eif (inputs.locality) p.set("locality", inputs.locality);
Eif (inputs.vastu) p.set("vastu", "yes");
return p;
}
export function decodeInputs(
params: URLSearchParams,
): Partial<CalculatorInputs> {
const result: Partial<CalculatorInputs> = {};
const bhkRaw = Number(params.get("bhk"));
Eif ([1, 2, 3, 4, 5].includes(bhkRaw)) {
result.bhk = bhkRaw as BHK;
}
const tier = params.get("tier");
Eif (tier && VALID_TIERS.includes(tier as Tier)) {
result.tier = tier as Tier;
}
const scope = params.get("scope");
Eif (scope && VALID_SCOPES.includes(scope as Scope)) {
result.scope = scope as Scope;
}
const zone = params.get("zone");
Eif (zone && VALID_ZONES.includes(zone as Zone)) {
result.zone = zone as Zone;
}
const locality = params.get("locality");
Eif (locality) result.locality = locality;
const vastu = params.get("vastu");
if (vastu === "yes") result.vastu = Etrue;
else if (vastu === "no") result.vastu = false;
return result;
}
export const DEFAULT_INPUTS: CalculatorInputs = {
bhk: 2,
tier: "comfort",
scope: "full-home",
zone: "south",
locality: "",
vastu: false,
};
/** Merge partial decoded inputs with defaults, enforcing valid bounds */
export function clampInputs(partial: Partial<CalculatorInputs>): CalculatorInputs {
const bhkRaw = partial.bhk ?? DEFAULT_INPUTS.bhk;
const bhk: BHK = Math.min(5, Math.max(1, Math.round(bhkRaw))) as BHK;
const tier: Tier = partial.tier && VALID_TIERS.includes(partial.tier)
? partial.tier
: DEFAULT_INPUTS.tier;
const scope: Scope = partial.scope && VALID_SCOPES.includes(partial.scope)
? partial.scope
: DEFAULT_INPUTS.scope;
const zone: Zone = partial.zone && VALID_ZONES.includes(partial.zone)
? partial.zone
: DEFAULT_INPUTS.zone;
return {
bhk,
tier,
scope,
zone,
locality: partial.locality ?? "",
vastu: partial.vastu ?? false,
};
}
|