package main

// Row colouring for the log grid, by QSL / LoTW status — the thing Logger32 does
// and the reason an operator can tell at a glance what still needs sending.
//
// Rules are ORDERED and the first match wins, because a contact is usually
// several things at once: one confirmed on LoTW and by card is confirmed, not
// "sent, awaiting reply". Putting the order in the data rather than in a chain
// of ifs is what lets the settings panel show it in the same order it applies.

import (
	"encoding/json"
	"regexp"
	"strings"
)

// RowColorRule is one status and the colour it paints.
type RowColorRule struct {
	ID      string `json:"id"`
	Color   string `json:"color"`
	Enabled bool   `json:"enabled"`
}

// RowColorSettings is the whole appearance block.
type RowColorSettings struct {
	Enabled bool `json:"enabled"`
	// Style is how the colour is shown: "bar" paints a stripe down the left edge,
	// "tint" washes the row, "both" does each.
	//
	// A bar is the default because a filled row is a poor signal in a log where
	// nearly every contact has SOME QSL state: colour that is always present
	// stops being information and becomes a striped background, with the data
	// behind it. The stripe says the same thing and costs nothing to read.
	Style string `json:"style"`
	// Intensity is the tint strength in percent. Only used by "tint"/"both".
	Intensity int `json:"intensity"`
	// BandMapLotw marks stations that upload to LoTW on the band map, with the
	// same "L" badge the cluster list uses — one visual vocabulary across the two
	// views rather than a second invention.
	BandMapLotw bool `json:"bandmap_lotw"`
	// Configured distinguishes "saved with this off" from "saved before the
	// option existed", so a new marker can default ON without silently turning
	// itself back on for an operator who switched it off.
	Configured bool           `json:"configured"`
	Rules      []RowColorRule `json:"rules"`
}

// The rule ids, in priority order. The frontend matches on these and holds the
// labels, so a translated name never has to travel through the settings.
var rowColorOrder = []string{
	"confirmed_lotw",  // LoTW confirmation received
	"confirmed_paper", // card or eQSL received
	"sent_waiting",    // sent by some route, nothing back yet
	"to_send",         // a card is requested / queued and has not gone out
}

// Defaults: green for done, amber for waiting, blue for owed. Deliberately
// muted — they are composited at low opacity over a dark grid, and a saturated
// value there reads as an error state rather than a status.
var rowColorDefaults = map[string]string{
	"confirmed_lotw":  "#16a34a",
	"confirmed_paper": "#0ea5e9",
	"sent_waiting":    "#f59e0b",
	"to_send":         "#a855f7",
}

// hexColor guards what reaches the stylesheet. The value is interpolated into a
// CSS color-mix() by the grid, so anything that is not plainly a hex colour is
// refused rather than passed through.
var hexColor = regexp.MustCompile(`^#[0-9a-fA-F]{6}$`)

func normRowColors(s RowColorSettings) RowColorSettings {
	byID := map[string]RowColorRule{}
	for _, r := range s.Rules {
		byID[r.ID] = r
	}
	out := RowColorSettings{
		Enabled: s.Enabled, Style: s.Style, Intensity: s.Intensity,
		BandMapLotw: s.BandMapLotw, Configured: true,
	}
	if !s.Configured {
		out.BandMapLotw = true // new option, on unless the operator says otherwise
	}
	switch out.Style {
	case "bar", "tint", "both":
	default:
		out.Style = "bar"
	}
	// Clamped rather than rejected: the value only shapes a colour-mix, and a
	// number outside the range is a slider that got away, not a fault worth
	// resetting the operator's whole choice for.
	if out.Intensity < 5 {
		out.Intensity = 12
	} else if out.Intensity > 45 {
		out.Intensity = 45
	}
	for _, id := range rowColorOrder {
		r := byID[id]
		r.ID = id
		if !hexColor.MatchString(strings.TrimSpace(r.Color)) {
			r.Color = rowColorDefaults[id]
		}
		out.Rules = append(out.Rules, r)
	}
	return out
}

// GetRowColors returns the row-colouring configuration, defaults included so the
// panel never has to invent one.
func (a *App) GetRowColors() RowColorSettings {
	var s RowColorSettings
	if raw := a.settingOr(keyRowColors, ""); raw != "" {
		_ = json.Unmarshal([]byte(raw), &s)
	}
	return normRowColors(s)
}

// SaveRowColors persists it.
func (a *App) SaveRowColors(s RowColorSettings) error {
	b, err := json.Marshal(normRowColors(s))
	if err != nil {
		return err
	}
	a.setSetting(keyRowColors, string(b))
	return nil
}