import { ExtractNumbers, Inspect } from "../common.ts";

const tests = [
    "seeds: 79 14 55 13",
    "",
    "seed-to-soil map:",
    "50 98 2",
    "52 50 48",
    "",
    "soil-to-fertilizer map:",
    "0 15 37",
    "37 52 2",
    "39 0 15",
    "",
    "fertilizer-to-water map:",
    "49 53 8",
    "0 11 42",
    "42 0 7",
    "57 7 4",
    "",
    "water-to-light map:",
    "88 18 7",
    "18 25 70",
    "",
    "light-to-temperature map:",
    "45 77 23",
    "81 45 19",
    "68 64 13",
    "",
    "temperature-to-humidity map:",
    "0 69 1",
    "1 0 69",
    "",
    "humidity-to-location map:",
    "60 56 37",
    "56 93 4",
];

const maps = ParseInput(tests);

const demoSeed = FindObjectByID(14, maps.Seeds);

Inspect(demoSeed);

const demoSoil = FindObjectByID(demoSeed?.ID || 0, maps.SeedToSoil);

Inspect(demoSoil);

function ParseInput(almanac: string[]): RangeMaps {
    /** An empty initializer for our output */
    const output: RangeMaps = {
        Seeds: [],
        SeedToSoil: [],
        SoilToFertilizer: [],
        FertilizerToWater: [],
        WaterToLight: [],
        LightToTemperature: [],
        TemperatureToHumidity: [],
        HumidityToLocation: [],
    };
    /** A translation map for range titles to RangeMap keys*/


    for (let i = 0; i < almanac.length; i++) {
        let line = almanac[i];

        // Parse the seed ID's
        if (/^seeds:/.test(line)) {
            // Extract all numbers from the line
            const seedIDs = ExtractNumbers(line);
            // Add to the output's Seeds array a new Seed for each number
            seedIDs.forEach((id) => { output.Seeds.push({ID: id}); });
            // Skip the next blank
            i++;
        }
        // Parse the Seed to Soil ranges
        else if (/^seed\-to/.test(line)) {
            output.SeedToSoil = ParseSourceDestinationRange(++i, almanac);
        }
        // Parse the Soil to Fertilizer ranges
        else if (/^soil\-to/.test(line)) {
            output.SoilToFertilizer = ParseSourceDestinationRange(++i, almanac);
        }
        // Parse the Fertilizer to Water ranges
        else if (/^fertilizer\-to/.test(line)) {
            output.FertilizerToWater = ParseSourceDestinationRange(++i, almanac);
        }
        // Parse the Water to Light ranges
        else if (/^water\-to/.test(line)) {
            output.WaterToLight = ParseSourceDestinationRange(++i, almanac);
        }
        // Parse the Light to Temperature ranges
        else if (/^light\-to/.test(line)) {
            output.LightToTemperature = ParseSourceDestinationRange(++i, almanac);
        }
        // Parse the Temperature to Humidity ranges
        else if (/^temperature\-to/.test(line)) {
            output.TemperatureToHumidity = ParseSourceDestinationRange(++i, almanac);
        }
        // Parse the Humidity to Location ranges
        else if (/^humidity\-to/.test(line)) {
            output.HumidityToLocation = ParseSourceDestinationRange(++i, almanac);
        }
    }

    return output;
}

/**
 * Helper function to parse the ranges for each mappable section
 *
 * @param {number} lineNumber The line number to begin parsing from
 * @param {string[]} almanac The complete almanac
 * @returns {MappableObject[]} A list of mapped indices
 */
function ParseSourceDestinationRange(lineNumber: number, almanac: string[]): MappableObject[] {
    const rangeMap: MappableObject[] = [];
    do {
        // Get the values out of the line
        const [destinationRangeStart, sourceRangeStart, rangeLength] = ExtractNumbers(almanac[lineNumber]);
        
        // Create the ranges
        for (let idx = 0; idx < rangeLength; idx++) {
            rangeMap.push({
                ID: sourceRangeStart + idx,
                PointsTo: destinationRangeStart + idx,
            });
        }
    } while(almanac[++lineNumber]);
    
    return rangeMap;
}

/**
 * Find an IdentifiableObject by its ID number
 *
 * @param needle The ID number to find
 * @param haystack The list to find the ID in
 * @returns {IdentifiableObject|undefined} The object by that ID if found, or undefined
 */
function FindObjectByID(needle: number, haystack: IdentifiableObject[]): IdentifiableObject|undefined {
    return haystack.find((obj) => obj.ID == needle);
}


interface IdentifiableObject {
    ID: number,
};

interface Seed extends IdentifiableObject {};

interface MappableObject extends IdentifiableObject {
    PointsTo: number,
};

type RangeMaps = {
    Seeds: Seed[],
    SeedToSoil: MappableObject[],
    SoilToFertilizer: MappableObject[],
    FertilizerToWater: MappableObject[],
    WaterToLight: MappableObject[],
    LightToTemperature: MappableObject[],
    TemperatureToHumidity: MappableObject[],
    HumidityToLocation: MappableObject[],
}