// lib/laser-finder.ts
export type LaserType = "fiber" | "co2_gantry" | "co2_galvo" | "uv";

export const LASER_LABEL: Record<LaserType, string> = {
    fiber: "Fiber (MOPA/QR)",
    co2_gantry: "CO₂ Gantry",
    co2_galvo: "CO₂ Galvo",
    uv: "UV (355 nm)",
};

export const TYPE_INFO: Record<
LaserType,
{
    summary: string;
    bestFor: string[];      // show as tags
    materials: string[];    // show as tags
    cautions: string[];     // negatives / limits
    learnLink: string;      // link to your settings pages
}
> = {
    fiber: {
        summary:
        "Best for marking/engraving bare metals, color marking on stainless (MOPA), and high-throughput galvo jobs.",
        bestFor: [
            "Bare metal marking",
            "Deep engraving on metals",
            "Color marking stainless",
            "Serials/QR/codes on parts",
        ],
        materials: ["Steel", "Stainless", "Aluminum", "Brass", "Titanium"],
        cautions: [
            "Not for cutting wood/acrylic",
            "Limited on organics/plastics (unless additives/coatings)",
        ],
        learnLink: "/fiber-settings",
    },
    co2_gantry: {
        summary:
        "Large work area; best for cutting & engraving non-metals (wood, acrylic, leather, textiles).",
        bestFor: ["Thick acrylic cuts", "Wood cutting/engraving", "Signage", "Textiles"],
        materials: ["Wood", "Acrylic", "Leather", "Paper", "Textiles", "Rubber"],
        cautions: [
            "Poor on bare metals without coatings",
            "Slower for fine micro-engraving",
        ],
        learnLink: "/co2-gantry-settings",
    },
    co2_galvo: {
        summary:
        "High-speed CO₂ marking/engraving on organics/non-metals with small scan fields.",
        bestFor: ["Fast marking on organics", "Photo engraving on wood/leather", "High throughput"],
        materials: ["Wood", "Leather", "Paper/Card", "Anodized/painted items"],
        cautions: [
            "Small scan field vs gantry",
            "Not for cutting thick sheets",
            "Poor on bare metals",
        ],
        learnLink: "/co2-galvo-settings",
    },
    uv: {
        summary:
        "Ultra-fine marking/engraving on plastics, glass, ceramics; low heat-affected zone for micro features.",
        bestFor: ["Micro text/logos", "Fine plastic marking", "Glass/ceramic marking"],
        materials: ["Plastics", "Glass", "Ceramics", "PCB/silicon (marking)"],
        cautions: [
            "Typically lower power; not for thick cutting",
            "Higher $/W, smaller working areas",
        ],
        learnLink: "/uv-settings",
    },
};

export type Answers = {
    materials: Array<
    | "metals_bare"
    | "metals_coated"
    | "plastics"
    | "wood_paper_leather"
    | "glass_ceramic"
    | "stone"
    | "textiles"
    >;
    operations: Array<
    | "deep_mark_metal"
    | "color_mark_stainless"
    | "fine_engraving"
    | "photo_engrave"
    | "cut_nonmetals_thick"
    | "cut_nonmetals_thin"
    | "mark_coated"
    >;
    part_size: "small" | "medium" | "large"; // ~ scan field or bed
    detail: "low" | "medium" | "high" | "micro";
    throughput: "low" | "medium" | "high";
    budget: "low" | "mid" | "high";
};

type Score = Record<LaserType, number>;
const bump = (s: Score, k: LaserType, n: number) => (s[k] += n);

export function scoreAnswers(a: Answers): {
    score: Score;
    ranked: LaserType[];
    why: Record<LaserType, string[]>;
} {
    const s: Score = { fiber: 0, co2_gantry: 0, co2_galvo: 0, uv: 0 };
    const why: Record<LaserType, string[]> = {
        fiber: [],
        co2_gantry: [],
        co2_galvo: [],
        uv: [],
    };

    // Materials
    if (a.materials.includes("metals_bare")) {
        bump(s, "fiber", 6); why.fiber.push("Bare metals benefit from fiber.");
        bump(s, "uv", 2);    why.uv.push("UV can mark some metals with fine detail.");
        bump(s, "co2_gantry", -3);
        bump(s, "co2_galvo", -3);
    }
    if (a.materials.includes("metals_coated")) {
        bump(s, "fiber", 3); why.fiber.push("Coated metals are fiber-friendly.");
        bump(s, "uv", 2);    why.uv.push("UV works well on coatings and labels.");
        bump(s, "co2_galvo", 1); why.co2_galvo.push("CO₂ galvo can mark coated items quickly.");
    }
    if (a.materials.includes("plastics") || a.materials.includes("wood_paper_leather")) {
        bump(s, "co2_gantry", 3); why.co2_gantry.push("Organics & plastics suit CO₂ gantry cutting/engraving.");
        bump(s, "co2_galvo", 3);  why.co2_galvo.push("CO₂ galvo is fast for organic marking.");
        bump(s, "uv", 1);         why.uv.push("UV excels at fine marking plastics.");
    }
    if (a.materials.includes("glass_ceramic")) {
        bump(s, "uv", 4);         why.uv.push("Glass/ceramic: UV has low HAZ for crisp marks.");
        bump(s, "co2_galvo", 1);
    }
    if (a.materials.includes("textiles")) {
        bump(s, "co2_gantry", 3); why.co2_gantry.push("Textiles: CO₂ gantry handles larger panels.");
    }
    if (a.materials.includes("stone")) {
        bump(s, "co2_gantry", 1); bump(s, "co2_galvo", 1);
    }

    // Operations
    if (a.operations.includes("deep_mark_metal")) { bump(s, "fiber", 5); why.fiber.push("Deep metal marking favors fiber."); }
    if (a.operations.includes("color_mark_stainless")) { bump(s, "fiber", 5); why.fiber.push("Color marking stainless = MOPA fiber."); }
    if (a.operations.includes("fine_engraving")) {
        bump(s, "uv", 4);    why.uv.push("Micro features need UV’s small spot.");
        bump(s, "fiber", 2); why.fiber.push("Fiber can achieve fine detail on metals.");
        bump(s, "co2_galvo", 2);
    }
    if (a.operations.includes("photo_engrave")) {
        bump(s, "uv", 3);         why.uv.push("UV gives clean dithers on many materials.");
        bump(s, "co2_galvo", 2);  why.co2_galvo.push("CO₂ galvo is common for photo engraving organics.");
    }
    if (a.operations.includes("cut_nonmetals_thick")) { bump(s, "co2_gantry", 6); why.co2_gantry.push("Thick cutting needs gantry CO₂."); }
    if (a.operations.includes("cut_nonmetals_thin")) {
        bump(s, "co2_gantry", 3); why.co2_gantry.push("Thin cutting works well on gantry CO₂.");
        bump(s, "co2_galvo", 2);
    }
    if (a.operations.includes("mark_coated")) {
        bump(s, "fiber", 2); why.fiber.push("Coated marks are straightforward on fiber.");
        bump(s, "uv", 2);    why.uv.push("UV marks coatings with low HAZ.");
        bump(s, "co2_galvo", 1);
    }

    // Part size & throughput
    if (a.part_size === "large") { bump(s, "co2_gantry", 5); why.co2_gantry.push("Large work area points to gantry CO₂."); }
    if (a.part_size === "small") { bump(s, "co2_galvo", 2); }
    if (a.throughput === "high") {
        bump(s, "co2_galvo", 3); why.co2_galvo.push("High throughput favors galvo systems.");
        bump(s, "fiber", 2);     why.fiber.push("Fiber galvos are fast on metals.");
    }

    // Detail requirement
    if (a.detail === "micro") {
        bump(s, "uv", 5);   why.uv.push("Micro detail → UV’s spot and short wavelength.");
        bump(s, "fiber", 2);
    } else if (a.detail === "high") {
        bump(s, "uv", 3);   bump(s, "fiber", 2); bump(s, "co2_galvo", 1);
    }

    // Budget (very soft tie-breaker)
    if (a.budget === "low") bump(s, "co2_gantry", 1);
    if (a.budget === "high") { bump(s, "fiber", 1); bump(s, "uv", 1); }

    const ranked = (Object.keys(s) as LaserType[]).sort((x, y) => s[y] - s[x]);
    return { score: s, ranked, why };
}