-- Ginxsom Blossom Server Database Schema
-- SQLite database for blob metadata and server configuration

-- Enable foreign key constraints
PRAGMA foreign_keys = ON;

-- Main blobs table for storing blob metadata
CREATE TABLE IF NOT EXISTS blobs (
    sha256 TEXT PRIMARY KEY NOT NULL,           -- SHA-256 hash (64 hex chars)
    size INTEGER NOT NULL,                      -- File size in bytes
    type TEXT NOT NULL,                         -- MIME type
    uploaded_at INTEGER NOT NULL,              -- Unix timestamp
    uploader_pubkey TEXT,                      -- Nostr public key (optional)
    filename TEXT,                             -- Original filename (optional)
    CHECK (length(sha256) = 64),               -- Ensure valid SHA-256 hash length
    CHECK (size >= 0),                         -- Ensure non-negative size
    CHECK (uploaded_at > 0)                    -- Ensure valid timestamp
);

-- Server configuration table for key-value settings
CREATE TABLE IF NOT EXISTS server_config (
    key TEXT PRIMARY KEY NOT NULL,             -- Configuration key
    value TEXT NOT NULL,                       -- Configuration value
    description TEXT,                          -- Human-readable description
    updated_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now'))  -- Last update timestamp
);

-- Indexes for performance optimization
CREATE INDEX IF NOT EXISTS idx_blobs_uploaded_at ON blobs(uploaded_at);
CREATE INDEX IF NOT EXISTS idx_blobs_uploader_pubkey ON blobs(uploader_pubkey);
CREATE INDEX IF NOT EXISTS idx_blobs_type ON blobs(type);
CREATE INDEX IF NOT EXISTS idx_blobs_size ON blobs(size);

-- Insert default server configuration
INSERT OR IGNORE INTO server_config (key, value, description) VALUES
    ('max_file_size', '104857600', 'Maximum file size in bytes (100MB)'),
    ('require_auth', 'false', 'Whether authentication is required for uploads'),
    ('allowed_types', '*', 'Allowed MIME types (* for all)'),
    ('server_name', 'ginxsom', 'Server name for responses'),
    ('storage_quota', '10737418240', 'Total storage quota in bytes (10GB)'),
    ('cleanup_interval', '86400', 'Cleanup interval in seconds (daily)'),
    ('max_upload_rate', '1048576', 'Max upload rate per client in bytes/sec (1MB/s)');

-- View for storage statistics
CREATE VIEW IF NOT EXISTS storage_stats AS
SELECT 
    COUNT(*) as total_blobs,
    SUM(size) as total_bytes,
    AVG(size) as avg_blob_size,
    MIN(uploaded_at) as first_upload,
    MAX(uploaded_at) as last_upload,
    COUNT(DISTINCT uploader_pubkey) as unique_uploaders
FROM blobs;

-- View for recent uploads (last 24 hours)
CREATE VIEW IF NOT EXISTS recent_uploads AS
SELECT 
    sha256,
    size,
    type,
    uploaded_at,
    uploader_pubkey,
    filename,
    datetime(uploaded_at, 'unixepoch') as uploaded_datetime
FROM blobs 
WHERE uploaded_at > (strftime('%s', 'now') - 86400)
ORDER BY uploaded_at DESC;