package main

import (
	"io/fs"
	"log/slog"
	"os"

	assets "galo"
	"galo/internal/config"
	"galo/internal/db"
)

func main() {
	loadDotEnv(".env")
	loadDotEnv("../.env")

	cfg, err := config.Load()
	if err != nil {
		slog.Error("config error", "error", err)
		os.Exit(1)
	}
	migFS, err := fs.Sub(assets.Migrations, "migrations")
	if err != nil {
		slog.Error("migrations fs", "error", err)
		os.Exit(1)
	}
	if err := db.Migrate(cfg.Postgres.DSN(), migFS); err != nil {
		slog.Error("migration failed", "error", err)
		os.Exit(1)
	}
	slog.Info("migrations applied")
}

func loadDotEnv(path string) {
	data, err := os.ReadFile(path)
	if err != nil {
		return
	}
	for _, line := range splitLines(string(data)) {
		if line == "" || line[0] == '#' {
			continue
		}
		for i := 0; i < len(line); i++ {
			if line[i] == '=' {
				key := line[:i]
				val := line[i+1:]
				if _, exists := os.LookupEnv(key); !exists {
					_ = os.Setenv(key, val)
				}
				break
			}
		}
	}
}

func splitLines(s string) []string {
	var out []string
	start := 0
	for i := 0; i < len(s); i++ {
		if s[i] == '\n' {
			out = append(out, trim(s[start:i]))
			start = i + 1
		}
	}
	out = append(out, trim(s[start:]))
	return out
}

func trim(s string) string {
	start, end := 0, len(s)
	for start < end && (s[start] == ' ' || s[start] == '\t' || s[start] == '\r') {
		start++
	}
	for end > start && (s[end-1] == ' ' || s[end-1] == '\t' || s[end-1] == '\r') {
		end--
	}
	return s[start:end]
}