-- ═══════════════════════════════════════════════════════════════════════════
-- AAMOS Admin v2 — Chat Schema
-- ═══════════════════════════════════════════════════════════════════════════

-- ── Chat Channels ──────────────────────────────────────────────────────────
CREATE TABLE IF NOT EXISTS chat_channels (
  id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  name                TEXT NOT NULL,
  description         TEXT,
  type                TEXT NOT NULL DEFAULT 'general', -- 'general'|'support'|'hr'|'direct'|'ticket'
  related_entity_type TEXT, -- 'ticket'|'customer'|'employee'
  related_entity_id   UUID,
  created_by          TEXT,
  is_active           BOOLEAN NOT NULL DEFAULT TRUE,
  last_activity       TIMESTAMPTZ,
  metadata            JSONB NOT NULL DEFAULT '{}',
  created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_chat_channels_type ON chat_channels (type);
CREATE INDEX IF NOT EXISTS idx_chat_channels_entity ON chat_channels (related_entity_type, related_entity_id);
CREATE INDEX IF NOT EXISTS idx_chat_channels_active ON chat_channels (is_active);

-- ── Chat Messages ──────────────────────────────────────────────────────────
CREATE TABLE IF NOT EXISTS chat_messages (
  id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  channel_id          UUID NOT NULL REFERENCES chat_channels(id) ON DELETE CASCADE,
  body                TEXT NOT NULL,
  author_id           TEXT,
  message_type        TEXT NOT NULL DEFAULT 'text', -- 'text'|'ticket_share'|'system'|'file'
  attachments         JSONB NOT NULL DEFAULT '[]',
  metadata            JSONB NOT NULL DEFAULT '{}',
  created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_chat_messages_channel ON chat_messages (channel_id);
CREATE INDEX IF NOT EXISTS idx_chat_messages_created ON chat_messages (created_at);

-- ── Chat Message Reads ─────────────────────────────────────────────────────
CREATE TABLE IF NOT EXISTS chat_message_reads (
  id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  message_id          UUID NOT NULL REFERENCES chat_messages(id) ON DELETE CASCADE,
  user_id             TEXT NOT NULL,
  read_at             TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  UNIQUE (message_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_chat_message_reads_user ON chat_message_reads (user_id);

-- ── Chat Channel Reads ─────────────────────────────────────────────────────
CREATE TABLE IF NOT EXISTS chat_channel_reads (
  id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  channel_id          UUID NOT NULL REFERENCES chat_channels(id) ON DELETE CASCADE,
  user_id             TEXT NOT NULL,
  last_read_at        TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  UNIQUE (channel_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_chat_channel_reads_user ON chat_channel_reads (user_id);

-- ── Chat Presence ──────────────────────────────────────────────────────────
CREATE TABLE IF NOT EXISTS chat_presence (
  id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id             TEXT NOT NULL UNIQUE,
  status              TEXT NOT NULL DEFAULT 'offline', -- 'online'|'away'|'busy'|'offline'
  last_seen           TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_chat_presence_status ON chat_presence (status);

-- ── Ticket Shares ──────────────────────────────────────────────────────────
CREATE TABLE IF NOT EXISTS ticket_shares (
  id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  ticket_id           UUID NOT NULL REFERENCES support_tickets(id),
  shared_by           TEXT NOT NULL,
  target_channel_id   UUID NOT NULL REFERENCES chat_channels(id),
  note                TEXT,
  created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_ticket_shares_ticket ON ticket_shares (ticket_id);
CREATE INDEX IF NOT EXISTS idx_ticket_shares_channel ON ticket_shares (target_channel_id);

-- Insert default channels
INSERT INTO chat_channels (name, description, type) VALUES
  ('General', 'Allmän diskussion', 'general'),
  ('Support', 'Supportärenden och eskalering', 'support'),
  ('HR', 'Personalfrågor', 'hr'),
  ('Försäljning', 'Sälj och leads', 'sales'),
  ('Teknik', 'Teknisk diskussion', 'tech')
ON CONFLICT DO NOTHING;