package app

import (
	"image/color"

	"charm.land/lipgloss/v2"
)

// Palette is the "Soft" chrome from docs/visual/ref with the blue accent:
// rounded borders, opaque dark panels, generous spacing.
type Palette struct {
	Bg       color.Color // panel/background fill
	BgDeep   color.Color // outermost backdrop (slightly darker)
	BgPanel  color.Color // inside-panel fill
	Sel      color.Color // selection row background
	Border   color.Color // idle panel border
	BorderHi color.Color // active panel border
	Fg       color.Color // primary text
	FgStrong color.Color // headings / emphasis
	Dim      color.Color // labels, secondary text
	Faint    color.Color // tertiary, hints
	Accent   color.Color // blue accent
	Accent2  color.Color // secondary accent

	OK   color.Color
	Warn color.Color
	Bad  color.Color

	DiffAdd color.Color // added-line cell background
	DiffDel color.Color // removed-line cell background

	CatLifecycle color.Color
	CatContext   color.Color
	CatInference color.Color
	CatTool      color.Color
	CatDomain    color.Color
	CatApproval  color.Color
}

// SoftBlue mirrors the reference Soft theme (#14161a bg, #ced3da fg) with the
// blue accent the user chose.
var SoftBlue = Palette{
	BgDeep:   lipgloss.Color("#101216"),
	Bg:       lipgloss.Color("#14161a"),
	BgPanel:  lipgloss.Color("#171a1f"),
	Sel:      lipgloss.Color("#1b2733"),
	Border:   lipgloss.Color("#262b33"),
	BorderHi: lipgloss.Color("#4a9eff"),
	Fg:       lipgloss.Color("#ced3da"),
	FgStrong: lipgloss.Color("#e8edf2"),
	Dim:      lipgloss.Color("#7c8794"),
	Faint:    lipgloss.Color("#525c68"),
	Accent:   lipgloss.Color("#4a9eff"),
	Accent2:  lipgloss.Color("#56c8d8"),

	OK:   lipgloss.Color("#7fd88f"),
	Warn: lipgloss.Color("#e8c06a"),
	Bad:  lipgloss.Color("#e87f7f"),

	DiffAdd: lipgloss.Color("#1b2a1d"),
	DiffDel: lipgloss.Color("#2c1c1f"),

	CatLifecycle: lipgloss.Color("#c98fd9"),
	CatContext:   lipgloss.Color("#b9c0c9"),
	CatInference: lipgloss.Color("#56c8d8"),
	CatTool:      lipgloss.Color("#8fd96a"),
	CatDomain:    lipgloss.Color("#e8b765"),
	CatApproval:  lipgloss.Color("#e8c06a"),
}

// Theme holds prebuilt lipgloss styles derived from a Palette. Every style sets
// a Background so the panels are fully opaque (no terminal wallpaper bleed).
type Theme struct {
	P Palette

	Screen     lipgloss.Style // full backdrop fill
	Panel      lipgloss.Style // idle rounded panel
	PanelHi    lipgloss.Style // active rounded panel
	PanelTitle lipgloss.Style // uppercase dim header label
	TitleHi    lipgloss.Style // active header label

	Text    lipgloss.Style
	Strong  lipgloss.Style
	Dim     lipgloss.Style
	Faint   lipgloss.Style
	Accent  lipgloss.Style
	SelRow  lipgloss.Style
	Status  lipgloss.Style // top bar
	Footer  lipgloss.Style // bottom hints
	Input   lipgloss.Style // input bar panel
	Overlay lipgloss.Style // modal box
	Scrim   lipgloss.Style // dim backdrop behind modals
}

// NewTheme builds the style set for a palette.
func NewTheme(p Palette) Theme {
	base := lipgloss.NewStyle().Background(p.Bg).Foreground(p.Fg)
	roundBase := func(border color.Color) lipgloss.Style {
		return lipgloss.NewStyle().
			Border(lipgloss.RoundedBorder()).
			BorderForeground(border).
			BorderBackground(p.Bg).
			Background(p.Bg).
			Foreground(p.Fg).
			Padding(0, 1)
	}
	return Theme{
		P:          p,
		Screen:     lipgloss.NewStyle().Background(p.BgDeep).Foreground(p.Fg),
		Panel:      roundBase(p.Border),
		PanelHi:    roundBase(p.BorderHi),
		PanelTitle: lipgloss.NewStyle().Background(p.Bg).Foreground(p.Dim).Bold(true),
		TitleHi:    lipgloss.NewStyle().Background(p.Bg).Foreground(p.Accent).Bold(true),
		Text:       base,
		Strong:     lipgloss.NewStyle().Background(p.Bg).Foreground(p.FgStrong).Bold(true),
		Dim:        lipgloss.NewStyle().Background(p.Bg).Foreground(p.Dim),
		Faint:      lipgloss.NewStyle().Background(p.Bg).Foreground(p.Faint),
		Accent:     lipgloss.NewStyle().Background(p.Bg).Foreground(p.Accent).Bold(true),
		SelRow:     lipgloss.NewStyle().Background(p.Sel).Foreground(p.FgStrong),
		Status:     lipgloss.NewStyle().Background(p.BgPanel).Foreground(p.Dim),
		Footer:     lipgloss.NewStyle().Background(p.BgDeep).Foreground(p.Faint),
		Input:      roundBase(p.BorderHi),
		Overlay: lipgloss.NewStyle().
			Border(lipgloss.RoundedBorder()).
			BorderForeground(p.Accent).
			BorderBackground(p.BgPanel).
			Background(p.BgPanel).
			Foreground(p.Fg).
			Padding(1, 2),
		Scrim: lipgloss.NewStyle().Background(p.BgDeep).Foreground(p.Faint),
	}
}

// categoryColor maps an event category label to its accent color.
func (t Theme) categoryColor(cat string) color.Color {
	switch cat {
	case "Lifecycle":
		return t.P.CatLifecycle
	case "Context":
		return t.P.CatContext
	case "Inference":
		return t.P.CatInference
	case "Tool":
		return t.P.CatTool
	case "Domain":
		return t.P.CatDomain
	case "Approval":
		return t.P.CatApproval
	default:
		return t.P.Dim
	}
}