-- ZFS Replication Tasks Table
-- Supports both outbound (sender) and inbound (receiver) replication
CREATE TABLE IF NOT EXISTS replication_tasks (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) NOT NULL,
    direction VARCHAR(20) NOT NULL, -- 'outbound' (sender) or 'inbound' (receiver)
    
    -- For outbound replication (sender)
    source_dataset VARCHAR(512), -- Source dataset on this system (outbound) or remote system (inbound)
    target_host VARCHAR(255), -- Target host IP or hostname (for outbound)
    target_port INTEGER DEFAULT 22, -- SSH port (default 22, for outbound)
    target_user VARCHAR(255) DEFAULT 'root', -- SSH user (for outbound)
    target_dataset VARCHAR(512), -- Target dataset on remote system (for outbound)
    target_ssh_key_path TEXT, -- Path to SSH private key (for outbound)
    
    -- For inbound replication (receiver)
    source_host VARCHAR(255), -- Source host IP or hostname (for inbound)
    source_port INTEGER DEFAULT 22, -- SSH port (for inbound)
    source_user VARCHAR(255) DEFAULT 'root', -- SSH user (for inbound)
    local_dataset VARCHAR(512), -- Local dataset to receive snapshots (for inbound)
    
    -- Common settings
    schedule_type VARCHAR(50), -- 'manual', 'hourly', 'daily', 'weekly', 'monthly', 'cron'
    schedule_config JSONB, -- Schedule configuration (similar to snapshot schedules)
    compression VARCHAR(50) DEFAULT 'lz4', -- 'off', 'lz4', 'gzip', 'zstd'
    encryption BOOLEAN DEFAULT false, -- Enable encryption during transfer
    recursive BOOLEAN DEFAULT false, -- Replicate recursively
    incremental BOOLEAN DEFAULT true, -- Use incremental replication
    auto_snapshot BOOLEAN DEFAULT true, -- Auto-create snapshot before replication
    
    -- Status and tracking
    enabled BOOLEAN NOT NULL DEFAULT true,
    status VARCHAR(50) DEFAULT 'idle', -- 'idle', 'running', 'failed', 'paused'
    last_run_at TIMESTAMP,
    last_run_status VARCHAR(50), -- 'success', 'failed', 'partial'
    last_run_error TEXT,
    next_run_at TIMESTAMP,
    last_snapshot_sent VARCHAR(512), -- Last snapshot successfully sent (for outbound)
    last_snapshot_received VARCHAR(512), -- Last snapshot successfully received (for inbound)
    
    -- Statistics
    total_runs INTEGER DEFAULT 0,
    successful_runs INTEGER DEFAULT 0,
    failed_runs INTEGER DEFAULT 0,
    bytes_sent BIGINT DEFAULT 0, -- Total bytes sent (for outbound)
    bytes_received BIGINT DEFAULT 0, -- Total bytes received (for inbound)
    
    created_by UUID REFERENCES users(id),
    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
    
    -- Validation: ensure required fields based on direction
    CONSTRAINT chk_direction CHECK (direction IN ('outbound', 'inbound')),
    CONSTRAINT chk_outbound_fields CHECK (
        direction != 'outbound' OR (
            source_dataset IS NOT NULL AND
            target_host IS NOT NULL AND
            target_dataset IS NOT NULL
        )
    ),
    CONSTRAINT chk_inbound_fields CHECK (
        direction != 'inbound' OR (
            source_host IS NOT NULL AND
            source_dataset IS NOT NULL AND
            local_dataset IS NOT NULL
        )
    )
);

-- Create indexes
CREATE INDEX IF NOT EXISTS idx_replication_tasks_direction ON replication_tasks(direction);
CREATE INDEX IF NOT EXISTS idx_replication_tasks_enabled ON replication_tasks(enabled);
CREATE INDEX IF NOT EXISTS idx_replication_tasks_status ON replication_tasks(status);
CREATE INDEX IF NOT EXISTS idx_replication_tasks_next_run ON replication_tasks(next_run_at);
CREATE INDEX IF NOT EXISTS idx_replication_tasks_source_dataset ON replication_tasks(source_dataset);
CREATE INDEX IF NOT EXISTS idx_replication_tasks_target_host ON replication_tasks(target_host);
