package tui

import (
	"fmt"
	"net/url"
	"os"
	"strings"

	"harness/internal/llm"
)

// human renders a token count the way a status bar wants to read it.
func human(n int) string {
	switch {
	case n >= 1_000_000:
		return fmt.Sprintf("%.1fM", float64(n)/1e6)
	case n >= 1_000:
		return fmt.Sprintf("%.1fk", float64(n)/1e3)
	}
	return fmt.Sprint(n)
}

// prettyModel names a model the way a person does. The transform itself lives
// in llm, next to the ids it is about, so the wizard's list and the status bar
// cannot disagree about what a model is called.
func prettyModel(id string) string { return llm.PrettyModel(id) }

// endpointLabel names where the prompts are going. The default endpoint gets
// a short name; anything else shows its host, because "somewhere that is not
// Anthropic" is the single most important thing the header can say.
func endpointLabel(c *llm.Client) string {
	if c == nil {
		return ""
	}
	if c.IsDefaultEndpoint() {
		return "anthropic"
	}
	if u, err := url.Parse(c.BaseURL); err == nil && u.Host != "" {
		return u.Host
	}
	return c.BaseURL
}

// camel renders a snake_case tool name as the transcript shows it: read_file
// becomes ReadFile. It is a display transform only — approvals and errors
// still quote the real name.
func camel(name string) string {
	parts := strings.Split(name, "_")
	for i, p := range parts {
		if p == "" {
			continue
		}
		parts[i] = strings.ToUpper(p[:1]) + p[1:]
	}
	return strings.Join(parts, "")
}

func maxInt(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func minInt(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// shortenHome writes a path the way a person says it. The working root is
// shown in the welcome block, where "~/Work/thing" carries the same
// information as the absolute path in a third of the columns.
func shortenHome(path string) string {
	home, err := os.UserHomeDir()
	if err != nil || home == "" || path == home {
		return path
	}
	if strings.HasPrefix(path, home+string(os.PathSeparator)) {
		return "~" + path[len(home):]
	}
	return path
}