package config

import "path/filepath"

const (
	AppName         = "task-master"
	DefaultProject  = "inbox"
	DefaultTheme    = "default"
	configFileName  = "config.json"
)

// Config holds application settings persisted under ~/.config/task-master.
type Config struct {
	ActiveProject string            `json:"activeProject"`
	DataDir       string            `json:"dataDir"`
	Theme         string            `json:"theme"`
	// ProjectLists maps project ID → board list id (all|backlog|in_progress|done).
	ProjectLists map[string]string `json:"projectLists,omitempty"`
}

// Path returns the absolute path to the config file.
func Path(home string) string {
	return filepath.Join(home, ".config", AppName, configFileName)
}

// DefaultDataDir returns the default data directory under ~/.local/share.
func DefaultDataDir(home string) string {
	return filepath.Join(home, ".local", "share", AppName)
}

// Defaults returns a Config with sensible defaults for the given home directory.
func Defaults(home string) Config {
	return Config{
		ActiveProject: DefaultProject,
		DataDir:       DefaultDataDir(home),
		Theme:         DefaultTheme,
		ProjectLists:  map[string]string{},
	}
}

// ApplyDefaults fills empty fields from defaults without overwriting set values.
func (c *Config) ApplyDefaults(home string) {
	d := Defaults(home)
	if c.ActiveProject == "" {
		c.ActiveProject = d.ActiveProject
	}
	if c.DataDir == "" {
		c.DataDir = d.DataDir
	}
	if c.Theme == "" {
		c.Theme = d.Theme
	}
	if c.ProjectLists == nil {
		c.ProjectLists = map[string]string{}
	}
}

// ActiveBoardList returns the persisted board list for a project (default: all).
func (c *Config) ActiveBoardList(projectID string) string {
	if c.ProjectLists == nil {
		return "all"
	}
	if v, ok := c.ProjectLists[projectID]; ok && v != "" {
		return v
	}
	return "all"
}

// SetActiveBoardList stores the board list for a project.
func (c *Config) SetActiveBoardList(projectID, listID string) {
	if c.ProjectLists == nil {
		c.ProjectLists = map[string]string{}
	}
	c.ProjectLists[projectID] = listID
}