package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strings"

	"atlas9.dev/c/demo/api/api_gen"
)

const demoModule = "atlas9.dev/c/demo"

func main() {
	if err := checkCwd(); err != nil {
		fmt.Fprintf(os.Stderr, "error: %s\n", err)
		os.Exit(1)
	}
	if err := generateApi(); err != nil {
		fmt.Fprintf(os.Stderr, "error: %s\n", err)
		os.Exit(1)
	}
	if err := copyFile("./api/generated/client.js", "./frontend/client.js"); err != nil {
		fmt.Fprintf(os.Stderr, "error: %s\n", err)
		os.Exit(1)
	}
	if err := generateDataModel(); err != nil {
		fmt.Fprintf(os.Stderr, "error: %s\n", err)
		os.Exit(1)
	}
}

func copyFile(src, dst string) error {

	in, err := os.Open(src)
	if err != nil {
		return fmt.Errorf("open %s: %w", src, err)
	}
	defer in.Close()

	out, err := os.Create(dst)
	if err != nil {
		return fmt.Errorf("create %s: %w", dst, err)
	}
	defer out.Close()

	if _, err := io.Copy(out, in); err != nil {
		return fmt.Errorf("copy %s -> %s: %w", src, dst, err)
	}
	return nil
}

func checkCwd() error {
	f, err := os.Open("go.mod")
	if err != nil {
		return fmt.Errorf("must be run from the root of the %s module: %w", demoModule, err)
	}
	defer f.Close()

	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if strings.HasPrefix(line, "module ") {
			mod := strings.TrimSpace(strings.TrimPrefix(line, "module"))
			if mod != demoModule {
				return fmt.Errorf("must be run from the root of the %s module (found module %q)", demoModule, mod)
			}
			return nil
		}
	}
	if err := scanner.Err(); err != nil {
		return fmt.Errorf("reading go.mod: %w", err)
	}
	return fmt.Errorf("go.mod has no module directive")
}

func generateApi() error {
	return api_gen.Run(api_gen.Config{
		InputDir:  "./api",
		OutputDir: "./api/generated",
		Module:    "atlas9.dev/c/demo/api",
		Formats:   []string{"openapi", "docs", "client", "tsclient", "jsclient"},

		Title:             "Atlas9 Demo API",
		Version:           "1.0.0",
		Description:       "Atlas9 Demo API",
		ServerURL:         "http://localhost:8080",
		ServerDescription: "Local development server",
	})
}