package config

import "path/filepath"

const (
	// AppName is used for config/data directory names under XDG paths.
	AppName = "task-master"
	// CliName is the installed binary / command name.
	CliName        = "tm"
	DefaultProject = "inbox"
	DefaultTheme   = "default"
	configFileName = "config.json"

	envHome    = "TASK_MASTER_HOME"
	envDataDir = "TASK_MASTER_DATA_DIR"
)

// 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 → comma-separated board list ids
	// (e.g. "all" or "backlog,in_progress").
	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{}
	}
}

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

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