package main

import "core:fmt"
import "core:mem"
import "core:os"
import "core:strconv"
//import "core:strings" // I know we'll use in future but because we're not right now, compiler is complaining
import "rocksdb"

Config :: struct {
	host:     string,
	port:     int,
	data_dir: string,
	verbose:  bool,
}

main :: proc() {
	// Parse configuration
	config := parse_config()

	// Print banner
	print_banner(config)

	// Create data directory
	os.make_directory(config.data_dir)

	// Initialize storage engine
	db, err := rocksdb.db_open(config.data_dir, true)
	if err != .None {
		fmt.eprintln("Failed to initialize storage:", err)
		os.exit(1)
	}
	defer rocksdb.db_close(&db)

	fmt.printfln("Storage engine initialized at %s", config.data_dir)
	fmt.printfln("Starting DynamoDB-compatible server on %s:%d", config.host, config.port)

	// Create HTTP server
	server_config := default_server_config()

	// For now, use a simple echo handler until we implement the full DynamoDB handler
	server, server_ok := server_init(
		context.allocator,
		config.host,
		config.port,
		handle_http_request,
		&db,
		server_config,
	)

	if !server_ok {
		fmt.eprintln("Failed to initialize HTTP server")
		os.exit(1)
	}
	defer server_stop(&server)

	fmt.println("Ready to accept connections!")

	// Start server (blocks)
	if !server_start(&server) {
		fmt.eprintln("Server failed to start")
		os.exit(1)
	}
}

// Temporary HTTP request handler
// TODO: Replace with full DynamoDB handler once dynamodb/handler.odin is implemented
handle_http_request :: proc(ctx: rawptr, request: ^HTTP_Request, request_alloc: mem.Allocator) -> HTTP_Response {
	//db := cast(^rocksdb.DB)ctx // I know we'll use in future but because we're not right now, compiler is complaining

	response := response_init(request_alloc)
	response_add_header(&response, "Content-Type", "application/x-amz-json-1.0")
	response_add_header(&response, "x-amzn-RequestId", "local-request-id")

	// Get X-Amz-Target header
	target := request_get_header(request, "X-Amz-Target")

	if t, ok := target.?; ok {
		// Echo back the operation for now
		body := fmt.aprintf("{{\"operation\":\"%s\",\"status\":\"not_implemented\"}}", t)
		response_set_body(&response, transmute([]byte)body)
	} else {
		response_set_status(&response, .Bad_Request)
		response_set_body(&response, transmute([]byte)string("{\"error\":\"Missing X-Amz-Target header\"}"))
	}

	return response
}

parse_config :: proc() -> Config {
	config := Config{
		host = "0.0.0.0",
		port = 8002,
		data_dir = "./data",
		verbose = false,
	}

	// Environment variables
	if port_str, env_ok := os.lookup_env("JORMUN_PORT"); env_ok {
		if port, parse_ok := strconv.parse_int(port_str); parse_ok {
			config.port = port
		}
	}

	if host, ok := os.lookup_env("JORMUN_HOST"); ok {
		config.host = host
	}

	if data_dir, ok := os.lookup_env("JORMUN_DATA_DIR"); ok {
		config.data_dir = data_dir
	}

	if verbose, ok := os.lookup_env("JORMUN_VERBOSE"); ok {
		config.verbose = verbose == "1"
	}

	// TODO: Parse command line arguments

	return config
}

print_banner :: proc(config: Config) {
	banner := `
  ╔═══════════════════════════════════════════════╗
  ║                                               ║
  ║     ╦╔═╗╦═╗╔╦╗╦ ╦╔╗╔╔╦╗╔╗                      ║
  ║     ║║ ║╠╦╝║║║║ ║║║║ ║║╠╩╗                     ║
  ║    ╚╝╚═╝╩╚═╩ ╩╚═╝╝╚╝═╩╝╚═╝                     ║
  ║                                               ║
  ║   DynamoDB-Compatible Database                ║
  ║   Powered by RocksDB + Odin                   ║
  ║                                               ║
  ╚═══════════════════════════════════════════════╝
`
	fmt.println(banner)
	fmt.printfln("  Port: %d | Data Dir: %s\n", config.port, config.data_dir)
}