package cli

import (
	"bytes"
	"errors"
	"fmt"
	"os"
	"path/filepath"

	"gopkg.in/yaml.v3"
)

func runConfig(root string, args []string) error {
	if len(args) == 0 {
		return errors.New("site config is local-file-only; edit config/site.yaml directly")
	}
	return fmt.Errorf("site config is local-file-only; edit config/site.yaml directly (unsupported subcommand %q)", args[0])
}

func loadLocalConfig(root string) (localConfig, error) {
	var config localConfig
	path := filepath.Join(root, "config/local.yaml")
	data, err := os.ReadFile(path)
	if err != nil {
		if errors.Is(err, os.ErrNotExist) {
			return config, nil
		}
		return config, err
	}
	if err := yaml.Unmarshal(data, &config); err != nil {
		return config, fmt.Errorf("%s: %w", path, err)
	}
	return config, nil
}

func readSiteConfig(root string) (siteConfigFile, error) {
	var config siteConfigFile
	path := filepath.Join(root, "config/site.yaml")
	data, err := os.ReadFile(path)
	if err != nil {
		return config, err
	}
	if err := yaml.Unmarshal(data, &config); err != nil {
		return config, fmt.Errorf("%s: %w", path, err)
	}
	return config, nil
}

func writeSiteConfig(root string, config siteConfigFile) error {
	var out bytes.Buffer
	encoder := yaml.NewEncoder(&out)
	encoder.SetIndent(2)
	if err := encoder.Encode(config); err != nil {
		return err
	}
	if err := encoder.Close(); err != nil {
		return err
	}

	path := filepath.Join(root, "config/site.yaml")
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		return err
	}
	tmp := path + ".tmp"
	if err := os.WriteFile(tmp, out.Bytes(), 0o644); err != nil {
		return err
	}
	return os.Rename(tmp, path)
}

func defaultSiteConfig() string {
	return `meta:
  config_version: 1
  updated_at: "2026-05-28T12:00:00+08:00"
  updated_by: "cli"

site:
  title: "Osaet"
  description: "Personal blog"
  base_url: "http://localhost:4321"
  language: "zh-CN"
  timezone: "Asia/Shanghai"

content:
  posts_dir: "content/posts"
  assets_dir: "content/assets"

build:
  astro_project: "frontend/site"
  output_dir: "dist/site"
`
}

func defaultLocalExampleConfig() string {
	return `database:
  driver: "sqlite"
  sqlite_path: ".osaet/osaet.db"
  postgres_dsn: ""

deepseek:
  api_key: ""
  api_key_env: "DEEPSEEK_API_KEY"
  base_url: "https://api.deepseek.com"
  model: "deepseek-v4-pro"
`
}