package projects

import (
	"bufio"
	"os"
	"path/filepath"
	"sort"
	"strconv"
	"strings"

	"codex-agent-manager/internal/codexhome"
)

type Store struct {
	CodexHome string
}

func (s Store) List() ([]Project, error) {
	configPath, err := codexhome.ResolveInside(s.CodexHome, "config.toml")
	if err != nil {
		return nil, err
	}
	data, err := os.ReadFile(configPath)
	if err != nil {
		if os.IsNotExist(err) {
			return []Project{}, nil
		}
		return nil, err
	}

	projects := parseProjectsConfig(string(data), configPath)
	sort.Slice(projects, func(i, j int) bool {
		return projects[i].Path < projects[j].Path
	})
	for i := range projects {
		if projects[i].DisplayName == "" {
			projects[i].DisplayName = filepath.Base(projects[i].Path)
		}
		if info, err := os.Stat(projects[i].Path); err == nil && info.IsDir() {
			projects[i].DirectoryExists = true
		}
	}
	return projects, nil
}

func parseProjectsConfig(input string, sourcePath string) []Project {
	var result []Project
	var current *Project
	scanner := bufio.NewScanner(strings.NewReader(input))
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		if strings.HasPrefix(line, "[") && strings.HasSuffix(line, "]") {
			current = nil
			section := strings.TrimSuffix(strings.TrimPrefix(line, "["), "]")
			if !strings.HasPrefix(section, "projects.") {
				continue
			}
			path, err := strconv.Unquote(strings.TrimPrefix(section, "projects."))
			if err != nil || path == "" {
				continue
			}
			result = append(result, Project{
				Path:       path,
				Source:     SourceEvidence{Kind: "config_toml", Path: sourcePath, Confidence: "high"},
				TrustLevel: "unknown",
			})
			current = &result[len(result)-1]
			continue
		}
		if current == nil {
			continue
		}
		key, raw, ok := strings.Cut(line, "=")
		if !ok {
			continue
		}
		value, err := strconv.Unquote(strings.TrimSpace(raw))
		if err != nil {
			continue
		}
		switch strings.TrimSpace(key) {
		case "trust_level":
			current.TrustLevel = value
		case "display_name":
			current.DisplayName = value
		}
	}
	return result
}