CREATE SCHEMA IF NOT EXISTS auth;

CREATE TABLE IF NOT EXISTS auth.users (
  id uuid PRIMARY KEY,
  email text NOT NULL UNIQUE,
  encrypted_password text NOT NULL,
  raw_user_meta_data jsonb NOT NULL DEFAULT '{}'::jsonb,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS public.users (
  id uuid PRIMARY KEY REFERENCES auth.users(id) ON DELETE CASCADE,
  email text NOT NULL UNIQUE,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  display_name text NOT NULL
);

CREATE TABLE IF NOT EXISTS auth.sessions (
  id uuid PRIMARY KEY,
  session_token text NOT NULL UNIQUE,
  user_id uuid NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  expires_at timestamptz NOT NULL
);

CREATE INDEX IF NOT EXISTS auth_sessions_user_id_idx ON auth.sessions(user_id);

CREATE TABLE IF NOT EXISTS public.tablos (
  id uuid PRIMARY KEY,
  owner_id uuid NOT NULL REFERENCES public.users(id) ON DELETE CASCADE,
  name text NOT NULL,
  color text NOT NULL,
  status text NOT NULL,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  deleted_at timestamptz NULL
);

CREATE INDEX IF NOT EXISTS tablos_owner_created_idx
ON public.tablos (owner_id, created_at DESC)
WHERE deleted_at IS NULL;

CREATE TABLE IF NOT EXISTS public.tasks (
  id uuid PRIMARY KEY,
  tablo_id uuid NOT NULL REFERENCES public.tablos(id) ON DELETE CASCADE,
  owner_id uuid NOT NULL REFERENCES public.users(id) ON DELETE CASCADE,
  title text NOT NULL,
  description text NOT NULL DEFAULT '',
  status text NOT NULL CHECK (status IN ('todo', 'in_progress', 'in_review', 'done')),
  assignee_id uuid NULL REFERENCES public.users(id) ON DELETE SET NULL,
  is_etape boolean NOT NULL DEFAULT false,
  parent_task_id uuid NULL REFERENCES public.tasks(id) ON DELETE SET NULL,
  due_date date NULL,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  deleted_at timestamptz NULL,
  CHECK (NOT is_etape OR parent_task_id IS NULL)
);

CREATE INDEX IF NOT EXISTS tasks_owner_tablo_deleted_idx
ON public.tasks (owner_id, tablo_id, deleted_at);

CREATE INDEX IF NOT EXISTS tasks_assignee_deleted_idx
ON public.tasks (assignee_id, deleted_at);

CREATE INDEX IF NOT EXISTS tasks_tablo_is_etape_deleted_idx
ON public.tasks (tablo_id, is_etape, deleted_at);

CREATE INDEX IF NOT EXISTS tasks_parent_task_id_idx
ON public.tasks (parent_task_id);

CREATE INDEX IF NOT EXISTS tasks_tablo_due_date_idx
ON public.tasks (tablo_id, due_date);

CREATE OR REPLACE FUNCTION public.validate_task_parent() RETURNS trigger
LANGUAGE plpgsql
AS $$
DECLARE
  parent_record public.tasks%ROWTYPE;
BEGIN
  IF NEW.parent_task_id IS NULL THEN
    RETURN NEW;
  END IF;

  IF NEW.is_etape THEN
    RAISE EXCEPTION 'Etapes cannot have parent tasks';
  END IF;

  SELECT *
  INTO parent_record
  FROM public.tasks
  WHERE id = NEW.parent_task_id;

  IF NOT FOUND OR parent_record.deleted_at IS NOT NULL THEN
    RAISE EXCEPTION 'Parent task is invalid';
  END IF;

  IF parent_record.is_etape IS NOT TRUE THEN
    RAISE EXCEPTION 'Parent task must be an etape';
  END IF;

  IF parent_record.owner_id <> NEW.owner_id THEN
    RAISE EXCEPTION 'Parent task owner must match child owner';
  END IF;

  IF parent_record.tablo_id <> NEW.tablo_id THEN
    RAISE EXCEPTION 'Parent task tablo must match child tablo';
  END IF;

  RETURN NEW;
END;
$$;

DROP TRIGGER IF EXISTS tasks_validate_parent_trigger ON public.tasks;
CREATE TRIGGER tasks_validate_parent_trigger
BEFORE INSERT OR UPDATE ON public.tasks
FOR EACH ROW
EXECUTE FUNCTION public.validate_task_parent();

CREATE OR REPLACE FUNCTION public.handle_new_user() RETURNS trigger
LANGUAGE plpgsql
SECURITY DEFINER
AS $$
BEGIN
  INSERT INTO public.users (id, email, created_at, updated_at, display_name)
  VALUES (
    NEW.id,
    NEW.email,
    NEW.created_at,
    NEW.updated_at,
    COALESCE(NEW.raw_user_meta_data ->> 'display_name', split_part(NEW.email, '@', 1))
  );

  RETURN NEW;
END;
$$;

DROP TRIGGER IF EXISTS on_auth_user_created ON auth.users;
CREATE TRIGGER on_auth_user_created
AFTER INSERT ON auth.users
FOR EACH ROW
EXECUTE FUNCTION public.handle_new_user();