-- Idempotent column sync v2 for existing databases
-- Adds columns and constraints that may be absent on servers deployed before 0000_baseline.sql.
-- Primary target: status_transitions table (and supporting unique constraints required for composite FKs).
-- Safe to run multiple times: all statements use IF NOT EXISTS / DO $$ BEGIN … END $$.

-- ============================================================
-- status_transitions table: columns added after initial deployment
-- ============================================================
ALTER TABLE status_transitions ADD COLUMN IF NOT EXISTS reject_to_status_id integer;
ALTER TABLE status_transitions ADD COLUMN IF NOT EXISTS assignee_user_id integer;
ALTER TABLE status_transitions ADD COLUMN IF NOT EXISTS assignee_conditions jsonb;
ALTER TABLE status_transitions ADD COLUMN IF NOT EXISTS approve_button_text varchar(50) DEFAULT 'Одобрить';
ALTER TABLE status_transitions ADD COLUMN IF NOT EXISTS approve_button_color varchar(7) DEFAULT '#22c55e';
ALTER TABLE status_transitions ADD COLUMN IF NOT EXISTS reject_button_text varchar(50) DEFAULT 'Отклонить';
ALTER TABLE status_transitions ADD COLUMN IF NOT EXISTS reject_button_color varchar(7) DEFAULT '#ef4444';
--> statement-breakpoint

-- ============================================================
-- form_statuses: unique(id, form_id) — required as FK target for
-- composite foreign keys on status_transitions
-- ============================================================
DO $$ BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM information_schema.table_constraints
    WHERE constraint_name = 'form_statuses_id_form_id_unique'
      AND table_name = 'form_statuses'
  ) THEN
    ALTER TABLE form_statuses ADD CONSTRAINT "form_statuses_id_form_id_unique" UNIQUE ("id", "form_id");
  END IF;
END $$;
--> statement-breakpoint

-- ============================================================
-- form_fields: unique(id, form_id) — mirrors baseline constraint,
-- required as FK target for other composite references
-- ============================================================
DO $$ BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM information_schema.table_constraints
    WHERE constraint_name = 'form_fields_id_form_id_unique'
      AND table_name = 'form_fields'
  ) THEN
    ALTER TABLE form_fields ADD CONSTRAINT "form_fields_id_form_id_unique" UNIQUE ("id", "form_id");
  END IF;
END $$;
--> statement-breakpoint

-- ============================================================
-- status_transitions: composite FK — from_status_id must belong
-- to the same form as form_id
-- ============================================================
DO $$ BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM information_schema.table_constraints
    WHERE constraint_name = 'fk_transition_from_status_same_form'
      AND table_name = 'status_transitions'
  ) THEN
    ALTER TABLE status_transitions
      ADD CONSTRAINT "fk_transition_from_status_same_form"
      FOREIGN KEY ("from_status_id", "form_id")
      REFERENCES form_statuses ("id", "form_id");
  END IF;
END $$;
--> statement-breakpoint

-- ============================================================
-- status_transitions: composite FK — to_status_id must belong
-- to the same form as form_id
-- ============================================================
DO $$ BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM information_schema.table_constraints
    WHERE constraint_name = 'fk_transition_to_status_same_form'
      AND table_name = 'status_transitions'
  ) THEN
    ALTER TABLE status_transitions
      ADD CONSTRAINT "fk_transition_to_status_same_form"
      FOREIGN KEY ("to_status_id", "form_id")
      REFERENCES form_statuses ("id", "form_id");
  END IF;
END $$;
--> statement-breakpoint

-- ============================================================
-- status_transitions: FK — reject_to_status_id -> form_statuses.id
-- ============================================================
DO $$ BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM pg_constraint
    WHERE conname = 'status_transitions_reject_to_status_id_form_statuses_id_fk'
  ) THEN
    ALTER TABLE status_transitions
      ADD CONSTRAINT "status_transitions_reject_to_status_id_form_statuses_id_fk"
      FOREIGN KEY ("reject_to_status_id") REFERENCES form_statuses ("id")
      ON DELETE no action ON UPDATE no action;
  END IF;
END $$;
--> statement-breakpoint

-- ============================================================
-- status_transitions: FK — assignee_user_id -> users.id
-- ============================================================
DO $$ BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM pg_constraint
    WHERE conname = 'status_transitions_assignee_user_id_users_id_fk'
  ) THEN
    ALTER TABLE status_transitions
      ADD CONSTRAINT "status_transitions_assignee_user_id_users_id_fk"
      FOREIGN KEY ("assignee_user_id") REFERENCES users ("id")
      ON DELETE no action ON UPDATE no action;
  END IF;
END $$;