// Package database handles SQLite database operations
package database

import (
	"database/sql"
	"fmt"
	"os"
	"path/filepath"

	_ "modernc.org/sqlite"
)

// Open opens the SQLite database with WAL mode enabled
func Open(path string) (*sql.DB, error) {
	// Ensure directory exists
	dir := filepath.Dir(path)
	if err := os.MkdirAll(dir, 0755); err != nil {
		return nil, fmt.Errorf("create database directory: %w", err)
	}

	// Open database with WAL mode and busy timeout
	dsn := fmt.Sprintf("%s?_pragma=journal_mode(WAL)&_pragma=busy_timeout(5000)&_pragma=foreign_keys(ON)", path)
	db, err := sql.Open("sqlite", dsn)
	if err != nil {
		return nil, fmt.Errorf("open database: %w", err)
	}

	// Test connection
	if err := db.Ping(); err != nil {
		db.Close()
		return nil, fmt.Errorf("ping database: %w", err)
	}

	// Set connection pool settings for SQLite
	db.SetMaxOpenConns(1) // SQLite single writer
	db.SetMaxIdleConns(1)

	return db, nil
}

// Migrate runs all database migrations
func Migrate(db *sql.DB) error {
	migrations := []string{
		migrationDevelopers,
		migrationAPIKeys,
		migrationApps,
		migrationAppVersions,
		migrationSigningKeys,
		migrationTelemetry,
		migrationAuditLogs,
		migrationIndexes,
	}

	for i, migration := range migrations {
		if _, err := db.Exec(migration); err != nil {
			return fmt.Errorf("migration %d: %w", i+1, err)
		}
	}

	return nil
}

const migrationDevelopers = `
CREATE TABLE IF NOT EXISTS developers (
    id TEXT PRIMARY KEY,
    email TEXT UNIQUE NOT NULL,
    name TEXT NOT NULL,
    password_hash TEXT,
    oauth_provider TEXT,
    oauth_id TEXT,
    verified INTEGER DEFAULT 0,
    created_at TEXT DEFAULT (datetime('now')),
    updated_at TEXT DEFAULT (datetime('now'))
);
`

const migrationAPIKeys = `
CREATE TABLE IF NOT EXISTS api_keys (
    id TEXT PRIMARY KEY,
    developer_id TEXT NOT NULL REFERENCES developers(id) ON DELETE CASCADE,
    name TEXT NOT NULL,
    key_hash TEXT NOT NULL,
    key_prefix TEXT NOT NULL,
    permissions TEXT DEFAULT '[]',
    last_used_at TEXT,
    expires_at TEXT,
    created_at TEXT DEFAULT (datetime('now'))
);
`

const migrationApps = `
CREATE TABLE IF NOT EXISTS apps (
    id TEXT PRIMARY KEY,
    developer_id TEXT NOT NULL REFERENCES developers(id) ON DELETE CASCADE,
    package_id TEXT UNIQUE NOT NULL,
    name TEXT NOT NULL,
    description TEXT,
    category TEXT,
    tags TEXT DEFAULT '[]',
    status TEXT DEFAULT 'draft',
    created_at TEXT DEFAULT (datetime('now')),
    updated_at TEXT DEFAULT (datetime('now'))
);
`

const migrationAppVersions = `
CREATE TABLE IF NOT EXISTS app_versions (
    id TEXT PRIMARY KEY,
    app_id TEXT NOT NULL REFERENCES apps(id) ON DELETE CASCADE,
    version_code INTEGER NOT NULL,
    version_name TEXT NOT NULL,
    package_url TEXT NOT NULL,
    package_size INTEGER NOT NULL,
    signature TEXT NOT NULL,
    permissions TEXT DEFAULT '[]',
    min_mosis_version TEXT,
    release_notes TEXT,
    status TEXT DEFAULT 'draft',
    review_notes TEXT,
    published_at TEXT,
    created_at TEXT DEFAULT (datetime('now')),
    UNIQUE(app_id, version_code)
);
`

const migrationSigningKeys = `
CREATE TABLE IF NOT EXISTS signing_keys (
    id TEXT PRIMARY KEY,
    developer_id TEXT NOT NULL REFERENCES developers(id) ON DELETE CASCADE,
    name TEXT NOT NULL,
    public_key TEXT NOT NULL,
    fingerprint TEXT NOT NULL,
    is_active INTEGER DEFAULT 1,
    created_at TEXT DEFAULT (datetime('now'))
);
`

const migrationTelemetry = `
CREATE TABLE IF NOT EXISTS telemetry_events (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    app_id TEXT NOT NULL,
    device_id TEXT NOT NULL,
    event_type TEXT NOT NULL,
    event_data TEXT,
    mosis_version TEXT,
    timestamp TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS crash_reports (
    id TEXT PRIMARY KEY,
    app_id TEXT NOT NULL,
    app_version TEXT NOT NULL,
    device_id TEXT NOT NULL,
    crash_type TEXT NOT NULL,
    message TEXT,
    stack_trace TEXT,
    context TEXT,
    mosis_version TEXT,
    timestamp TEXT NOT NULL,
    created_at TEXT DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS telemetry_daily (
    app_id TEXT NOT NULL,
    date TEXT NOT NULL,
    event_type TEXT NOT NULL,
    count INTEGER NOT NULL,
    unique_devices INTEGER NOT NULL,
    PRIMARY KEY (app_id, date, event_type)
);
`

const migrationAuditLogs = `
CREATE TABLE IF NOT EXISTS audit_logs (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    developer_id TEXT,
    action TEXT NOT NULL,
    resource_type TEXT,
    resource_id TEXT,
    details TEXT,
    ip_address TEXT,
    user_agent TEXT,
    created_at TEXT DEFAULT (datetime('now'))
);
`

const migrationIndexes = `
CREATE INDEX IF NOT EXISTS idx_developers_email ON developers(email);
CREATE INDEX IF NOT EXISTS idx_developers_oauth ON developers(oauth_provider, oauth_id);
CREATE INDEX IF NOT EXISTS idx_api_keys_developer ON api_keys(developer_id);
CREATE INDEX IF NOT EXISTS idx_api_keys_prefix ON api_keys(key_prefix);
CREATE INDEX IF NOT EXISTS idx_apps_developer ON apps(developer_id);
CREATE INDEX IF NOT EXISTS idx_apps_package ON apps(package_id);
CREATE INDEX IF NOT EXISTS idx_apps_status ON apps(status);
CREATE INDEX IF NOT EXISTS idx_versions_app ON app_versions(app_id);
CREATE INDEX IF NOT EXISTS idx_versions_status ON app_versions(status);
CREATE INDEX IF NOT EXISTS idx_signing_keys_developer ON signing_keys(developer_id);
CREATE INDEX IF NOT EXISTS idx_signing_keys_fingerprint ON signing_keys(fingerprint);
CREATE INDEX IF NOT EXISTS idx_telemetry_app ON telemetry_events(app_id, timestamp);
CREATE INDEX IF NOT EXISTS idx_crashes_app ON crash_reports(app_id, timestamp);
CREATE INDEX IF NOT EXISTS idx_audit_developer ON audit_logs(developer_id);
CREATE INDEX IF NOT EXISTS idx_audit_created ON audit_logs(created_at);
`