# Generated by Django 5.2.17 on 2026-08-19

from django.db import migrations


def retarget_cycles_flock_fk(apps, schema_editor):
    connection = schema_editor.connection
    if connection.vendor != "sqlite":
        return
    with connection.cursor() as cursor:
        cursor.execute("SELECT sql FROM sqlite_master WHERE name='cycles'")
        row = cursor.fetchone()
        if not row or "flock_old" not in (row[0] or ""):
            return
        cursor.execute("PRAGMA foreign_keys=OFF")
        cursor.execute("ALTER TABLE cycles RENAME TO cycles_old")
        cursor.execute(
            """
            CREATE TABLE cycles (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                total_days integer NOT NULL,
                start_date date NOT NULL,
                end_date date NOT NULL,
                doc_in_weight integer NOT NULL,
                doc_in_count integer NOT NULL,
                created_at datetime NOT NULL,
                updated_at datetime NOT NULL,
                flock_id bigint NOT NULL REFERENCES flock(id) DEFERRABLE INITIALLY DEFERRED,
                kandang_id bigint NOT NULL REFERENCES kandang(id) DEFERRABLE INITIALLY DEFERRED,
                status varchar(30) NOT NULL,
                CONSTRAINT chk_cycles_date_range CHECK (end_date >= start_date)
            )
            """
        )
        cursor.execute(
            """
            INSERT INTO cycles (
                id, total_days, start_date, end_date, doc_in_weight, doc_in_count,
                created_at, updated_at, flock_id, kandang_id, status
            )
            SELECT
                id, total_days, start_date, end_date, doc_in_weight, doc_in_count,
                created_at, updated_at, flock_id, kandang_id, status
            FROM cycles_old
            """
        )
        cursor.execute("DROP TABLE cycles_old")
        cursor.execute("PRAGMA foreign_keys=ON")


class Migration(migrations.Migration):

    dependencies = [
        ("farms", "0003_flock_cycle_nullable"),
    ]

    operations = [
        migrations.RunPython(retarget_cycles_flock_fk, migrations.RunPython.noop),
    ]