package config

import (
	"fmt"
	"os"
	"path/filepath"
)

// ResolveConfigPath finds config.yaml: --config, then next to the exe, then cwd.
func ResolveConfigPath(flagPath string) (string, error) {
	var cands []string
	if flagPath != "" {
		cands = append(cands, flagPath)
	}
	if exe, err := os.Executable(); err == nil {
		dir := filepath.Dir(exe)
		cands = append(cands, filepath.Join(dir, "config.yaml"))
		cands = append(cands, filepath.Join(dir, "..", "config.yaml"))
	}
	cands = append(cands, "config.yaml")
	seen := map[string]bool{}
	for _, p := range cands {
		abs, err := filepath.Abs(p)
		if err != nil {
			continue
		}
		abs = filepath.Clean(abs)
		if seen[abs] {
			continue
		}
		seen[abs] = true
		st, err := os.Stat(abs)
		if err == nil && !st.IsDir() {
			return abs, nil
		}
	}
	if flagPath == "" {
		flagPath = "config.yaml"
	}
	abs, err := filepath.Abs(flagPath)
	if err != nil {
		return flagPath, fmt.Errorf("config not found: %s", flagPath)
	}
	return abs, fmt.Errorf("config not found: %s", abs)
}

// ResolvePaths makes LogFile absolute relative to the config file directory.
func (c *Config) ResolvePaths() {
	if c == nil {
		return
	}
	if p, err := filepath.Abs(c.Path); err == nil {
		c.Path = p
	}
	if c.LogFile == "" {
		c.LogFile = DefaultLogFile
	}
	if !filepath.IsAbs(c.LogFile) {
		c.LogFile = filepath.Join(filepath.Dir(c.Path), c.LogFile)
	}
	c.LogFile = filepath.Clean(c.LogFile)
}