import { describe, expect, it } from "@suaveplan/testing/runner";
import fc from "fast-check";
import {
    concatUint8Arrays,
    convertDataFormat,
    detectInputFormat,
    formatOutput,
    inputToUint8Array,
    sliceUint8Array,
    uint8ArraysEqual,
    validateInputTypeFormat,
} from "./uint8.js";

describe("concatUint8Arrays", () => {
    it("concatenates multiple arrays", { timeout: 5000 }, () => {
        const a = new Uint8Array([1, 2]);
        const b = new Uint8Array([3, 4]);
        const c = new Uint8Array([5]);
        expect(concatUint8Arrays(a, b, c)).toEqual(
            new Uint8Array([1, 2, 3, 4, 5])
        );
    });

    it("handles empty arrays", { timeout: 5000 }, () => {
        expect(
            concatUint8Arrays(new Uint8Array(), new Uint8Array([1]))
        ).toEqual(new Uint8Array([1]));
    });

    it("handles single array", { timeout: 5000 }, () => {
        const a = new Uint8Array([1, 2, 3]);
        expect(concatUint8Arrays(a)).toEqual(a);
    });

    it("handles no arguments", { timeout: 5000 }, () => {
        expect(concatUint8Arrays()).toEqual(new Uint8Array());
    });

    it("concatUint8Arrays associativity", { timeout: 30000 }, () => {
        fc.assert(
            fc.property(
                fc.uint8Array(),
                fc.uint8Array(),
                fc.uint8Array(),
                (a, b, c) => {
                    const left = concatUint8Arrays(concatUint8Arrays(a, b), c);
                    const right = concatUint8Arrays(a, concatUint8Arrays(b, c));
                    expect(left).toEqual(right);
                }
            )
        );
    });
});

describe("sliceUint8Array", () => {
    it("slices correctly", { timeout: 5000 }, () => {
        const arr = new Uint8Array([1, 2, 3, 4, 5]);
        expect(sliceUint8Array(arr, 1, 3)).toEqual(new Uint8Array([2, 3]));
    });

    it("slices from start only", { timeout: 5000 }, () => {
        const arr = new Uint8Array([1, 2, 3, 4, 5]);
        expect(sliceUint8Array(arr, 2)).toEqual(new Uint8Array([3, 4, 5]));
    });

    it("returns empty for zero-length slice", { timeout: 5000 }, () => {
        const arr = new Uint8Array([1, 2, 3]);
        expect(sliceUint8Array(arr, 1, 1)).toEqual(new Uint8Array());
    });
});

describe("uint8ArraysEqual", () => {
    it("returns true for equal arrays", { timeout: 5000 }, () => {
        expect(
            uint8ArraysEqual(
                new Uint8Array([1, 2, 3]),
                new Uint8Array([1, 2, 3])
            )
        ).toBe(true);
    });

    it("returns false for different arrays", { timeout: 5000 }, () => {
        expect(
            uint8ArraysEqual(
                new Uint8Array([1, 2, 3]),
                new Uint8Array([1, 2, 4])
            )
        ).toBe(false);
    });

    it("returns false for different lengths", { timeout: 5000 }, () => {
        expect(
            uint8ArraysEqual(new Uint8Array([1, 2]), new Uint8Array([1, 2, 3]))
        ).toBe(false);
    });

    it("returns true for two empty arrays", { timeout: 5000 }, () => {
        expect(uint8ArraysEqual(new Uint8Array(), new Uint8Array())).toBe(true);
    });
});

describe("detectInputFormat", () => {
    it("detects Uint8Array", { timeout: 5000 }, () => {
        expect(detectInputFormat(new Uint8Array())).toBe("uint8array");
    });

    it("detects hex string", { timeout: 5000 }, () => {
        expect(detectInputFormat("48656c6c6f")).toBe("hex");
    });

    it("detects utf8 for general string", { timeout: 5000 }, () => {
        expect(detectInputFormat("Hello, world!")).toBe("utf8");
    });

    it("detects utf8 for non-hex even string", { timeout: 5000 }, () => {
        expect(detectInputFormat("not-hex-string")).toBe("utf8");
    });
});

describe("inputToUint8Array", () => {
    it("returns Uint8Array as-is", { timeout: 5000 }, () => {
        const arr = new Uint8Array([1, 2, 3]);
        expect(inputToUint8Array(arr)).toBe(arr);
    });

    it("converts hex string to Uint8Array", { timeout: 5000 }, () => {
        expect(inputToUint8Array("48656c6c6f", "hex")).toEqual(
            new Uint8Array([72, 101, 108, 108, 111])
        );
    });

    it("converts utf8 string to Uint8Array", { timeout: 5000 }, () => {
        expect(inputToUint8Array("Hello", "utf8")).toEqual(
            new Uint8Array([72, 101, 108, 108, 111])
        );
    });

    it("converts base64 string to Uint8Array", { timeout: 5000 }, () => {
        expect(inputToUint8Array("SGVsbG8=", "base64")).toEqual(
            new Uint8Array([72, 101, 108, 108, 111])
        );
    });

    it("auto-detects format when not provided", { timeout: 5000 }, () => {
        // "48656c6c6f" is valid hex
        const result = inputToUint8Array("48656c6c6f");
        expect(result).toEqual(new Uint8Array([72, 101, 108, 108, 111]));
    });

    it("throws when string given with uint8array format", {
        timeout: 5000,
    }, () => {
        expect(() => inputToUint8Array("hello", "uint8array")).toThrow();
    });
});

describe("validateInputTypeFormat", () => {
    it("validates Uint8Array with uint8array format", { timeout: 5000 }, () => {
        expect(() =>
            validateInputTypeFormat(new Uint8Array(), "uint8array")
        ).not.toThrow();
    });

    it("validates string with hex format", { timeout: 5000 }, () => {
        expect(() => validateInputTypeFormat("ff", "hex")).not.toThrow();
    });

    it("throws when Uint8Array given but string format requested", {
        timeout: 5000,
    }, () => {
        expect(() =>
            validateInputTypeFormat(new Uint8Array(), "hex")
        ).toThrow();
    });

    it("throws when string given but uint8array format requested", {
        timeout: 5000,
    }, () => {
        expect(() => validateInputTypeFormat("hello", "uint8array")).toThrow();
    });
});

describe("formatOutput", () => {
    it("returns Uint8Array for uint8array format", { timeout: 5000 }, () => {
        const arr = new Uint8Array([1, 2, 3]);
        const result = formatOutput(arr, "uint8array");
        expect(result).toBe(arr);
    });

    it("returns hex string for hex format", { timeout: 5000 }, () => {
        expect(formatOutput(new Uint8Array([255]), "hex")).toBe("ff");
    });

    it("returns base64 string for base64 format", { timeout: 5000 }, () => {
        expect(
            formatOutput(new Uint8Array([72, 101, 108, 108, 111]), "base64")
        ).toBe("SGVsbG8=");
    });

    it("returns utf8 string for utf8 format", { timeout: 5000 }, () => {
        expect(
            formatOutput(new Uint8Array([72, 101, 108, 108, 111]), "utf8")
        ).toBe("Hello");
    });
});

describe("convertDataFormat", () => {
    it("converts hex to utf8", { timeout: 5000 }, () => {
        expect(convertDataFormat("48656c6c6f", "utf8", "hex")).toBe("Hello");
    });

    it("converts utf8 to hex", { timeout: 5000 }, () => {
        expect(convertDataFormat("Hello", "hex", "utf8")).toBe("48656c6c6f");
    });

    it("converts Uint8Array to hex", { timeout: 5000 }, () => {
        expect(
            convertDataFormat(new Uint8Array([72, 101, 108, 108, 111]), "hex")
        ).toBe("48656c6c6f");
    });

    it("converts hex to base64", { timeout: 5000 }, () => {
        expect(convertDataFormat("48656c6c6f", "base64", "hex")).toBe(
            "SGVsbG8="
        );
    });

    it("converts Uint8Array to uint8array (identity)", {
        timeout: 5000,
    }, () => {
        const arr = new Uint8Array([1, 2, 3]);
        expect(convertDataFormat(arr, "uint8array")).toBe(arr);
    });

    it("auto-detects input format for hex strings", { timeout: 5000 }, () => {
        expect(convertDataFormat("48656c6c6f", "utf8")).toBe("Hello");
    });
});