package main

// One palette, two variants, named by role.
//
// Catppuccin, because it is the scheme people already run in this terminal and
// because its two variants are designed together: the same roles keep the same
// meaning in light and dark. Panels ask for a role and never for a colour, so a
// light terminal needs no second design.

import (
	"os"
	"strings"
)

type palette struct {
	Base      string
	Surface   string
	Overlay   string
	Text      string
	Muted     string
	Accent    string
	Info      string
	Success   string
	Warning   string
	Error     string
	Mauve     string
	Selection string
}

var mocha = palette{
	Base:      "#1e1e2e",
	Surface:   "#313244",
	Overlay:   "#6c7086",
	Text:      "#cdd6f4",
	Muted:     "#a6adc8",
	Accent:    "#89b4fa",
	Info:      "#94e2d5",
	Success:   "#a6e3a1",
	Warning:   "#f9e2af",
	Error:     "#f38ba8",
	Mauve:     "#cba6f7",
	Selection: "#45475a",
}

var latte = palette{
	Base:      "#eff1f5",
	Surface:   "#ccd0da",
	Overlay:   "#8c8fa1",
	Text:      "#4c4f69",
	Muted:     "#6c6f85",
	Accent:    "#1e66f5",
	Info:      "#179299",
	Success:   "#40a02b",
	Warning:   "#df8e1d",
	Error:     "#d20f39",
	Mauve:     "#8839ef",
	Selection: "#bcc0cc",
}

// active is the palette this run draws with. It is chosen once, at startup, so
// nothing downstream has to think about it.
var active = mocha

func choosePalette(force string) {
	switch strings.ToLower(force) {
	case "light":
		active = latte
	case "dark":
		active = mocha
	default:
		// COLORFGBG is what many terminals export: "foreground;background".
		if v := os.Getenv("COLORFGBG"); v != "" {
			parts := strings.Split(v, ";")
			bg := parts[len(parts)-1]
			// A light background is one of the high numbers in the 16-colour
			// range; anything above 6 is light in practice.
			if bg == "15" || bg == "7" {
				active = latte
			}
		}
	}
}

// Icons. Nerd Font glyphs, with an ASCII fallback so the interface still reads
// when the font is not installed or the terminal cannot show it: -ascii, or a
// TERM that says it cannot, chooses the fallback.
type glyphSet struct {
	Todo, Running, Blocked, Review, Done, Cancelled string
	Folder, Branch, Commit, Cost, Person, Agent     string
	Arrow, Dot, Rule                                string
}

var nerdGlyphs = glyphSet{
	Todo: "\uf10c", Running: "\uf04b", Blocked: "\uf05e", Review: "\uf06e",
	Done: "\uf00c", Cancelled: "\uf00d",
	Folder: "\uf07b", Branch: "\uf126", Commit: "\uf1d3", Cost: "\uf155",
	Person: "\uf007", Agent: "\uf085",
	Arrow: "\uf105", Dot: "\uf111", Rule: "─",
}

var plainGlyphs = glyphSet{
	Todo: "·", Running: "▶", Blocked: "■", Review: "◆",
	Done: "✓", Cancelled: "✕",
	Folder: "/", Branch: "branch", Commit: "commit", Cost: "cents",
	Person: "you", Agent: "agent",
	Arrow: "›", Dot: "·", Rule: "─",
}

// icons starts as plain Unicode on purpose. The Nerd Font is installed, but a
// private-use glyph does not survive TUIOS's own screen capture, so whether it
// draws cannot be checked from here. The words next to every icon carry the
// meaning either way, and -nerd opts into the richer set once it has been seen
// on the terminal that matters.
var icons = plainGlyphs

func chooseGlyphs(useNerd bool) {
	if useNerd {
		icons = nerdGlyphs
		return
	}
	icons = plainGlyphs
}