-- Users Table Migration
-- Core user authentication and profile data

-- Create users table
CREATE TABLE IF NOT EXISTS users (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  email VARCHAR(255) NOT NULL UNIQUE,
  password_hash VARCHAR(255) NOT NULL,
  username VARCHAR(50) UNIQUE,
  display_name VARCHAR(100),
  avatar_url TEXT,
  verified_domain VARCHAR(255),
  is_premium BOOLEAN DEFAULT false,
  premium_tier VARCHAR(20) CHECK (premium_tier IN ('free', 'premium', 'enterprise')) DEFAULT 'free',
  premium_expires_at TIMESTAMP,
  status VARCHAR(20) CHECK (status IN ('online', 'away', 'dnd', 'offline')) DEFAULT 'offline',
  custom_status VARCHAR(128),
  last_login TIMESTAMP,
  email_verified BOOLEAN DEFAULT false,
  email_verified_at TIMESTAMP,
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW()
);

-- Indexes for performance
CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
CREATE INDEX IF NOT EXISTS idx_users_username ON users(username);
CREATE INDEX IF NOT EXISTS idx_users_verified_domain ON users(verified_domain) WHERE verified_domain IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_users_status ON users(status);

-- Function to update updated_at timestamp
CREATE OR REPLACE FUNCTION update_updated_at_column()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ language 'plpgsql';

-- Trigger to auto-update updated_at
DROP TRIGGER IF EXISTS update_users_updated_at ON users;
CREATE TRIGGER update_users_updated_at
    BEFORE UPDATE ON users
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();

-- Friends/Relationships table
CREATE TABLE IF NOT EXISTS user_relationships (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  target_user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  relationship_type VARCHAR(20) CHECK (relationship_type IN ('friend', 'pending', 'blocked')) NOT NULL,
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW(),
  CONSTRAINT unique_relationship UNIQUE(user_id, target_user_id)
);

CREATE INDEX IF NOT EXISTS idx_user_relationships_user_id ON user_relationships(user_id);
CREATE INDEX IF NOT EXISTS idx_user_relationships_target_user_id ON user_relationships(target_user_id);

-- Servers/Guilds table
CREATE TABLE IF NOT EXISTS servers (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  name VARCHAR(100) NOT NULL,
  description TEXT,
  icon_url TEXT,
  banner_url TEXT,
  owner_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  invite_code VARCHAR(20) UNIQUE,
  is_public BOOLEAN DEFAULT false,
  member_count INTEGER DEFAULT 1,
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_servers_owner_id ON servers(owner_id);
CREATE INDEX IF NOT EXISTS idx_servers_invite_code ON servers(invite_code);

-- Server Members table
CREATE TABLE IF NOT EXISTS server_members (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  server_id UUID NOT NULL REFERENCES servers(id) ON DELETE CASCADE,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  nickname VARCHAR(100),
  role VARCHAR(20) CHECK (role IN ('owner', 'admin', 'moderator', 'member')) DEFAULT 'member',
  joined_at TIMESTAMP DEFAULT NOW(),
  CONSTRAINT unique_server_member UNIQUE(server_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_server_members_server_id ON server_members(server_id);
CREATE INDEX IF NOT EXISTS idx_server_members_user_id ON server_members(user_id);

-- Channels table
CREATE TABLE IF NOT EXISTS channels (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  server_id UUID REFERENCES servers(id) ON DELETE CASCADE,
  name VARCHAR(100) NOT NULL,
  description TEXT,
  channel_type VARCHAR(20) CHECK (channel_type IN ('text', 'voice', 'announcement', 'stage')) DEFAULT 'text',
  position INTEGER DEFAULT 0,
  is_private BOOLEAN DEFAULT false,
  slowmode_seconds INTEGER DEFAULT 0,
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_channels_server_id ON channels(server_id);

-- Messages table
CREATE TABLE IF NOT EXISTS messages (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  channel_id UUID REFERENCES channels(id) ON DELETE CASCADE,
  conversation_id UUID,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  content TEXT NOT NULL,
  message_type VARCHAR(20) CHECK (message_type IN ('text', 'image', 'file', 'system')) DEFAULT 'text',
  attachments JSONB DEFAULT '[]',
  is_edited BOOLEAN DEFAULT false,
  is_pinned BOOLEAN DEFAULT false,
  reply_to_id UUID REFERENCES messages(id) ON DELETE SET NULL,
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_messages_channel_id ON messages(channel_id);
CREATE INDEX IF NOT EXISTS idx_messages_conversation_id ON messages(conversation_id);
CREATE INDEX IF NOT EXISTS idx_messages_user_id ON messages(user_id);
CREATE INDEX IF NOT EXISTS idx_messages_created_at ON messages(created_at DESC);

-- Message Reactions table
CREATE TABLE IF NOT EXISTS message_reactions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  message_id UUID NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  emoji VARCHAR(50) NOT NULL,
  created_at TIMESTAMP DEFAULT NOW(),
  CONSTRAINT unique_reaction UNIQUE(message_id, user_id, emoji)
);

CREATE INDEX IF NOT EXISTS idx_message_reactions_message_id ON message_reactions(message_id);

-- Voice Channel Sessions table
CREATE TABLE IF NOT EXISTS voice_sessions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  channel_id UUID NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  joined_at TIMESTAMP DEFAULT NOW(),
  left_at TIMESTAMP,
  is_muted BOOLEAN DEFAULT false,
  is_deafened BOOLEAN DEFAULT false,
  is_streaming BOOLEAN DEFAULT false,
  is_video_on BOOLEAN DEFAULT false
);

CREATE INDEX IF NOT EXISTS idx_voice_sessions_channel_id ON voice_sessions(channel_id);
CREATE INDEX IF NOT EXISTS idx_voice_sessions_user_id ON voice_sessions(user_id);
CREATE INDEX IF NOT EXISTS idx_voice_sessions_active ON voice_sessions(channel_id) WHERE left_at IS NULL;

-- Comments
COMMENT ON TABLE users IS 'Core user accounts for AeThex Connect';
COMMENT ON TABLE servers IS 'Discord-style servers/guilds';
COMMENT ON TABLE channels IS 'Text and voice channels within servers';
COMMENT ON TABLE messages IS 'Chat messages in channels or DMs';
COMMENT ON TABLE voice_sessions IS 'Active voice channel participants';