const fs = require("fs");
const path = require("path");
const vm = require("vm");
const assert = require("assert");

const rootDir = path.resolve(__dirname, "..", "..");

const loadBuildRepsArrRulesModule = () => {
    const filePath = path.join(
        rootDir,
        "components",
        "case",
        "representation",
        "utils",
        "buildRepsArrRules.js"
    );

    let source = fs.readFileSync(filePath, "utf8");
    source = source.replace(/export const\s+/g, "const ");
    source += `
module.exports = {
  APPEAL_TYPES,
  SPECIALIST_PROCESS,
  INVOLVEMENT_TYPES,
  buildRepresentationContext,
  buildRepsArrFromContext
};
`;

    const context = {
        module: { exports: {} },
        exports: {},
        require,
        Date
    };

    vm.runInNewContext(source, context, { filename: filePath });
    return context.module.exports;
};

const tests = [];
const test = (name, fn) => tests.push({ name, fn });

const mod = loadBuildRepsArrRulesModule();
const {
    APPEAL_TYPES,
    SPECIALIST_PROCESS,
    INVOLVEMENT_TYPES,
    buildRepresentationContext,
    buildRepsArrFromContext
} = mod;

const BASE_DETAILS = {
    pinswg_startdate: "2026-04-01T00:00:00.000Z",
    pinswg_statementduedate: "2026-04-30T00:00:00.000Z",
    pinswg_finalcommentsduedate: "2026-05-25T00:00:00.000Z"
};

const baseInput = (overrides = {}) => ({
    detailsObj: BASE_DETAILS,
    appealType: 846040000,
    specialistProcess: SPECIALIST_PROCESS.WRITTEN_REPS,
    involvementType: 999,
    selectedCapacity: "appellant",
    isCaseOwner: false,
    isNRW: false,
    now: new Date("2026-04-10T10:00:00.000Z"),
    ...overrides
});

const normalizeForAssertion = (value) =>
    JSON.parse(JSON.stringify(value ?? null));

const buildOptions = (overrides = {}) =>
    normalizeForAssertion(
        buildRepsArrFromContext(
            buildRepresentationContext(baseInput(overrides))
        )
    );

test("baseline truth-table: non-DNS non-SIPS across windows/capacities/ownership", () => {
    const capacities = [
        { value: "appellant", hasFinalComments: true },
        { value: "agent", hasFinalComments: true },
        { value: "interestedparty", hasFinalComments: true },
        { value: false, hasFinalComments: false },
        { value: "", hasFinalComments: false },
        { value: "unknown", hasFinalComments: false }
    ];

    const cases = [
        {
            label: "before start",
            now: "2026-03-31T10:00:00.000Z",
            expected: (c, isCaseOwner) => []
        },
        {
            label: "statement period",
            now: "2026-04-15T10:00:00.000Z",
            expected: (c, isCaseOwner) => (isCaseOwner ? [] : ["Statement"])
        },
        {
            label: "final comments period",
            now: "2026-05-10T10:00:00.000Z",
            expected: (c) => (c.hasFinalComments ? ["Final comments"] : [])
        },
        {
            label: "after final comments due",
            now: "2026-05-26T10:00:00.000Z",
            expected: () => []
        }
    ];

    for (const capacity of capacities) {
        for (const scenario of cases) {
            for (const isCaseOwner of [true, false]) {
                const result = buildOptions({
                    selectedCapacity: capacity.value,
                    isCaseOwner,
                    now: new Date(scenario.now)
                });
                assert.deepStrictEqual(
                    result,
                    scenario.expected(capacity, isCaseOwner),
                    `Failed for ${scenario.label}, capacity=${capacity.value}, isCaseOwner=${isCaseOwner}`
                );
            }
        }
    }
});

test("LPA involvement: questionnaire and final comments windows", () => {
    assert.deepStrictEqual(
        buildOptions({
            involvementType: INVOLVEMENT_TYPES.LPA,
            selectedCapacity: "unknown",
            now: new Date("2026-04-10T10:00:00.000Z")
        }),
        ["Questionnaire", "Statement"]
    );

    assert.deepStrictEqual(
        buildOptions({
            involvementType: INVOLVEMENT_TYPES.LPA,
            selectedCapacity: "unknown",
            now: new Date("2026-05-10T10:00:00.000Z")
        }),
        ["Questionnaire", "Final comments"]
    );

    assert.deepStrictEqual(
        buildOptions({
            involvementType: INVOLVEMENT_TYPES.LPA,
            selectedCapacity: "unknown",
            now: new Date("2026-05-26T10:00:00.000Z")
        }),
        []
    );
});

test("questionnaire excluded appeal types for LPA", () => {
    const excluded = [846040019, 846040011, 846040015, 846040016];
    for (const appealType of excluded) {
        const result = buildOptions({
            appealType,
            involvementType: INVOLVEMENT_TYPES.LPA,
            now: new Date("2026-04-10T10:00:00.000Z")
        });
        assert.strictEqual(
            result.includes("Questionnaire"),
            false,
            `Questionnaire should be excluded for ${appealType}`
        );
    }
});

test("householder: statements blocked; final comments depend on specialist process", () => {
    assert.deepStrictEqual(
        buildOptions({
            appealType: APPEAL_TYPES.HOUSEHOLDER,
            selectedCapacity: "appellant",
            specialistProcess: SPECIALIST_PROCESS.HEARING,
            now: new Date("2026-04-15T10:00:00.000Z")
        }),
        []
    );

    assert.deepStrictEqual(
        buildOptions({
            appealType: APPEAL_TYPES.HOUSEHOLDER,
            selectedCapacity: "appellant",
            specialistProcess: SPECIALIST_PROCESS.HEARING,
            now: new Date("2026-05-10T10:00:00.000Z")
        }),
        []
    );

    assert.deepStrictEqual(
        buildOptions({
            appealType: APPEAL_TYPES.HOUSEHOLDER,
            selectedCapacity: "appellant",
            specialistProcess: SPECIALIST_PROCESS.WRITTEN_REPS,
            now: new Date("2026-05-10T10:00:00.000Z")
        }),
        ["Final comments"]
    );
});

test("advert appeal type: LPA written reps blocks statement, non-LPA non-owner can still submit statement", () => {
    assert.deepStrictEqual(
        buildOptions({
            appealType: APPEAL_TYPES.ADVERT,
            involvementType: INVOLVEMENT_TYPES.LPA,
            specialistProcess: SPECIALIST_PROCESS.WRITTEN_REPS,
            now: new Date("2026-04-15T10:00:00.000Z")
        }),
        ["Questionnaire"]
    );

    assert.deepStrictEqual(
        buildOptions({
            appealType: APPEAL_TYPES.ADVERT,
            involvementType: 999,
            isCaseOwner: false,
            now: new Date("2026-04-15T10:00:00.000Z")
        }),
        ["Statement"]
    );
});

test("DNS rules: statement/LIR ownership behaviour and questionnaire exclusion", () => {
    const dnsDetails = {
        pinswg_applicationacceptedasvalid: "2026-04-01T00:00:00.000Z",
        pinswg_endofrepresentationperiod: "2026-05-25T00:00:00.000Z"
    };

    const dnsOptions = (overrides = {}) =>
        normalizeForAssertion(
            buildRepsArrFromContext(
                buildRepresentationContext(
                    baseInput({
                        appealType: APPEAL_TYPES.DNS,
                        detailsObj: dnsDetails,
                        ...overrides
                    })
                )
            )
        );

    assert.deepStrictEqual(
        dnsOptions({
            involvementType: 999,
            isCaseOwner: false,
            now: new Date("2026-05-01T10:00:00.000Z")
        }),
        ["Statement"]
    );

    assert.deepStrictEqual(
        dnsOptions({
            involvementType: 999,
            isCaseOwner: true,
            now: new Date("2026-05-01T10:00:00.000Z")
        }),
        []
    );

    assert.deepStrictEqual(
        dnsOptions({
            involvementType: INVOLVEMENT_TYPES.LPA,
            isCaseOwner: false,
            now: new Date("2026-05-01T10:00:00.000Z")
        }),
        ["Local Impact Report", "Statement", "Final comments"]
    );

    assert.deepStrictEqual(
        dnsOptions({
            involvementType: INVOLVEMENT_TYPES.LPA,
            isCaseOwner: true,
            now: new Date("2026-05-01T10:00:00.000Z")
        }),
        ["Final comments"]
    );

    assert.strictEqual(
        dnsOptions({
            involvementType: INVOLVEMENT_TYPES.LPA,
            isCaseOwner: false,
            now: new Date("2026-05-01T10:00:00.000Z")
        }).includes("Questionnaire"),
        false
    );
});

test("SIPS consultation behaviour is not date-gated", () => {
    const sips = (overrides = {}) =>
        buildOptions({ appealType: APPEAL_TYPES.SIPS, ...overrides });

    assert.deepStrictEqual(
        sips({ selectedCapacity: "appellant", isNRW: false }),
        ["Statement", "Consultation Response"]
    );

    assert.deepStrictEqual(sips({ selectedCapacity: "agent", isNRW: false }), [
        "Statement",
        "Consultation Response",
        "Local Impact Report"
    ]);

    assert.deepStrictEqual(
        sips({ selectedCapacity: "interestedparty", isNRW: true }),
        [
            "Statement",
            "Consultation Response",
            "Local Impact Report",
            "Marine Impact Report"
        ]
    );

    assert.deepStrictEqual(
        sips({
            selectedCapacity: "appellant",
            now: new Date("2026-06-01T10:00:00.000Z")
        }),
        ["Consultation Response"]
    );
});

test("deduplication and ordering are stable", () => {
    const result = buildOptions({
        appealType: APPEAL_TYPES.SIPS,
        involvementType: INVOLVEMENT_TYPES.LPA,
        selectedCapacity: "agent",
        isNRW: true,
        isCaseOwner: false,
        now: new Date("2026-05-10T10:00:00.000Z")
    });

    assert.deepStrictEqual(result, [
        "Questionnaire",
        "Final comments",
        "Consultation Response",
        "Local Impact Report",
        "Marine Impact Report"
    ]);
    assert.strictEqual(new Set(result).size, result.length);
});

test("invalid or missing dates suppress date-gated options but SIPS consultation persists", () => {
    assert.deepStrictEqual(
        normalizeForAssertion(
            buildRepsArrFromContext(
                buildRepresentationContext(
                    baseInput({
                        detailsObj: {
                            pinswg_statementduedate: "2026-04-30T00:00:00.000Z",
                            pinswg_finalcommentsduedate:
                                "2026-05-25T00:00:00.000Z"
                        }
                    })
                )
            )
        ),
        []
    );

    assert.deepStrictEqual(
        normalizeForAssertion(
            buildRepsArrFromContext(
                buildRepresentationContext(
                    baseInput({
                        detailsObj: {
                            pinswg_startdate: "2026-04-01T00:00:00.000Z",
                            pinswg_finalcommentsduedate:
                                "2026-05-25T00:00:00.000Z"
                        }
                    })
                )
            )
        ),
        []
    );

    assert.deepStrictEqual(
        normalizeForAssertion(
            buildRepsArrFromContext(
                buildRepresentationContext(
                    baseInput({
                        detailsObj: {
                            pinswg_startdate: "2026-04-01T00:00:00.000Z",
                            pinswg_statementduedate: "2026-04-30T00:00:00.000Z"
                        },
                        involvementType: INVOLVEMENT_TYPES.LPA,
                        now: new Date("2026-05-10T10:00:00.000Z")
                    })
                )
            )
        ),
        []
    );

    assert.deepStrictEqual(
        normalizeForAssertion(
            buildRepsArrFromContext(
                buildRepresentationContext(
                    baseInput({
                        appealType: APPEAL_TYPES.SIPS,
                        detailsObj: {},
                        selectedCapacity: "agent",
                        isNRW: true,
                        now: new Date("2026-06-20T10:00:00.000Z")
                    })
                )
            )
        ),
        ["Consultation Response", "Local Impact Report", "Marine Impact Report"]
    );
});

test("capacity normalization coverage", () => {
    const inFinalWindow = { now: new Date("2026-05-10T10:00:00.000Z") };

    assert.deepStrictEqual(
        buildOptions({ selectedCapacity: "appellant", ...inFinalWindow }),
        ["Final comments"]
    );

    assert.deepStrictEqual(
        buildOptions({ selectedCapacity: "Appellant", ...inFinalWindow }),
        ["Final comments"]
    );

    assert.deepStrictEqual(
        buildOptions({
            selectedCapacity: "Interested Party",
            ...inFinalWindow
        }),
        ["Final comments"]
    );

    assert.deepStrictEqual(
        buildOptions({
            selectedCapacity: "interested-party",
            ...inFinalWindow
        }),
        ["Final comments"]
    );

    assert.deepStrictEqual(
        buildOptions({ selectedCapacity: "agent", ...inFinalWindow }),
        ["Final comments"]
    );
});

const run = async () => {
    let passed = 0;
    for (const currentTest of tests) {
        await currentTest.fn();
        passed += 1;
    }
    console.log(
        `Phase 22 representation buildRepsArr rules tests passed (${passed}/${tests.length}).`
    );
};

module.exports = run;

if (require.main === module) {
    run().catch((error) => {
        console.error(error);
        process.exit(1);
    });
}