#!/usr/bin/env bash
set -euo pipefail

repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "${repo_root}"

project="minerops-agent-enrollment-migration-$$"
compose=(
    docker compose
    --project-name "${project}"
    --env-file .env.dev
    -f compose.dev.yaml
)

cleanup() {
    "${compose[@]}" down -v --remove-orphans >/dev/null 2>&1 || true
}
trap cleanup EXIT

set -a
# shellcheck disable=SC1091
source .env.dev
set +a

echo "Starting disposable PostgreSQL..."
"${compose[@]}" up -d postgres

echo "Waiting for PostgreSQL..."
for attempt in $(seq 1 60); do
    if "${compose[@]}" exec -T postgres \
        pg_isready -U "${POSTGRES_USER}" -d "${POSTGRES_DB}" >/dev/null 2>&1; then
        break
    fi
    if [[ "${attempt}" -eq 60 ]]; then
        echo "PostgreSQL did not become ready" >&2
        exit 1
    fi
    sleep 1
done

echo "Building backend with migration 0017..."
"${compose[@]}" build backend >/dev/null

run_backend() {
    "${compose[@]}" run --rm --no-deps backend "$@"
}

psql_exec() {
    "${compose[@]}" exec -T postgres \
        psql -v ON_ERROR_STOP=1 \
        -U "${POSTGRES_USER}" \
        -d "${POSTGRES_DB}" "$@"
}

echo "Testing upgrade through 0016..."
run_backend alembic upgrade 0016_agent_zones

revision="$(
    psql_exec -Atc "SELECT version_num FROM alembic_version"
)"
[[ "${revision}" == "0016_agent_zones" ]]

echo "Testing 0016 -> 0017..."
run_backend alembic upgrade 0017_agent_enrollment

revision="$(
    psql_exec -Atc "SELECT version_num FROM alembic_version"
)"
[[ "${revision}" == "0017_agent_enrollment" ]]

echo "Checking new Agent credential columns..."
for column in \
    display_name \
    agent_secret_hash \
    credential_created_at \
    credential_revoked_at
do
    count="$(
        psql_exec -Atc "
            SELECT COUNT(*)
            FROM information_schema.columns
            WHERE table_schema = 'public'
              AND table_name = 'minerops_site_agents'
              AND column_name = '${column}'
        "
    )"
    [[ "${count}" == "1" ]]
done

echo "Checking enrollment table..."
count="$(
    psql_exec -Atc "
        SELECT COUNT(*)
        FROM information_schema.tables
        WHERE table_schema = 'public'
          AND table_name = 'agent_enrollments'
    "
)"
[[ "${count}" == "1" ]]

echo "Checking expected indexes..."
for index in \
    uq_minerops_site_agents_agent_secret_hash \
    uq_agent_enrollments_token_hash \
    uq_agent_enrollments_open_zone \
    uq_agent_enrollments_enrolled_agent \
    idx_agent_enrollments_site_id \
    idx_agent_enrollments_created_at
do
    count="$(
        psql_exec -Atc "
            SELECT COUNT(*)
            FROM pg_indexes
            WHERE schemaname = 'public'
              AND indexname = '${index}'
        "
    )"
    [[ "${count}" == "1" ]]
done

echo "Testing immediate legal downgrade..."
run_backend alembic downgrade 0016_agent_zones

revision="$(
    psql_exec -Atc "SELECT version_num FROM alembic_version"
)"
[[ "${revision}" == "0016_agent_zones" ]]

count="$(
    psql_exec -Atc "
        SELECT COUNT(*)
        FROM information_schema.tables
        WHERE table_schema = 'public'
          AND table_name = 'agent_enrollments'
    "
)"
[[ "${count}" == "0" ]]

echo "Re-upgrading to 0017..."
run_backend alembic upgrade 0017_agent_enrollment

echo "Creating isolated Site and Agent Zone fixtures..."
psql_exec <<'SQL'
INSERT INTO sites (id, name)
VALUES (
    '00000000-0000-4000-8000-000000001700',
    'Enrollment Migration Test Site'
);

INSERT INTO agent_zones (
    id,
    site_id,
    name,
    description,
    is_enabled
)
VALUES (
    '00000000-0000-4000-8000-000000001701',
    '00000000-0000-4000-8000-000000001700',
    'Enrollment Test Zone',
    'Disposable migration test',
    true
);
SQL

echo "Testing database constraints..."

psql_exec <<'SQL'
DO $$
BEGIN
    BEGIN
        INSERT INTO agent_enrollments (
            token_hash,
            site_id,
            agent_zone_id,
            display_name,
            expires_at
        )
        VALUES (
            'not-a-sha256-hash',
            '00000000-0000-4000-8000-000000001700',
            '00000000-0000-4000-8000-000000001701',
            'Invalid Hash',
            now() + interval '30 minutes'
        );
        RAISE EXCEPTION 'invalid token hash was accepted';
    EXCEPTION
        WHEN check_violation THEN NULL;
    END;
END $$;
SQL

psql_exec <<'SQL'
INSERT INTO agent_enrollments (
    id,
    token_hash,
    site_id,
    agent_zone_id,
    display_name,
    expires_at
)
VALUES (
    '00000000-0000-4000-8000-000000001710',
    repeat('a', 64),
    '00000000-0000-4000-8000-000000001700',
    '00000000-0000-4000-8000-000000001701',
    'Enrollment Test Agent',
    now() + interval '30 minutes'
);

DO $$
BEGIN
    BEGIN
        INSERT INTO agent_enrollments (
            token_hash,
            site_id,
            agent_zone_id,
            display_name,
            expires_at
        )
        VALUES (
            repeat('b', 64),
            '00000000-0000-4000-8000-000000001700',
            '00000000-0000-4000-8000-000000001701',
            'Second Open Enrollment',
            now() + interval '30 minutes'
        );
        RAISE EXCEPTION 'second open enrollment was accepted';
    EXCEPTION
        WHEN unique_violation THEN NULL;
    END;
END $$;
SQL

echo "Testing credential hash integrity and uniqueness..."

psql_exec <<'SQL'
INSERT INTO minerops_site_agents (
    agent_id,
    site_id,
    agent_zone_id,
    site_name,
    display_name,
    agent_secret_hash,
    credential_created_at
)
VALUES (
    'agent-enrollment-test',
    '00000000-0000-4000-8000-000000001700',
    '00000000-0000-4000-8000-000000001701',
    'Enrollment Migration Test Site',
    'Enrollment Test Agent',
    repeat('c', 64),
    now()
);

DO $$
BEGIN
    BEGIN
        INSERT INTO minerops_site_agents (
            agent_id,
            site_name,
            display_name,
            agent_secret_hash,
            credential_created_at
        )
        VALUES (
            'agent-enrollment-duplicate-secret',
            'Enrollment Migration Test Site',
            'Duplicate Secret',
            repeat('c', 64),
            now()
        );
        RAISE EXCEPTION 'duplicate Agent secret hash was accepted';
    EXCEPTION
        WHEN unique_violation THEN NULL;
    END;
END $$;
SQL

echo "Testing downgrade refusal after feature use..."

set +e
downgrade_output="$(
    run_backend alembic downgrade 0016_agent_zones 2>&1
)"
downgrade_status=$?
set -e

if [[ "${downgrade_status}" -eq 0 ]]; then
    echo "Downgrade unexpectedly succeeded after enrollment/credential use" >&2
    exit 1
fi

grep -Eq \
    'Cannot downgrade 0017: Agent enrollment history exists|Cannot downgrade 0017: per-Agent credentials exist' \
    <<<"${downgrade_output}"

revision="$(
    psql_exec -Atc "SELECT version_num FROM alembic_version"
)"
[[ "${revision}" == "0017_agent_enrollment" ]]

echo "Confirming refusal happened before destructive schema changes..."

count="$(
    psql_exec -Atc "
        SELECT COUNT(*)
        FROM information_schema.tables
        WHERE table_schema = 'public'
          AND table_name = 'agent_enrollments'
    "
)"
[[ "${count}" == "1" ]]

count="$(
    psql_exec -Atc "
        SELECT COUNT(*)
        FROM information_schema.columns
        WHERE table_schema = 'public'
          AND table_name = 'minerops_site_agents'
          AND column_name = 'agent_secret_hash'
    "
)"
[[ "${count}" == "1" ]]

echo "Agent enrollment migration lifecycle checks passed."