package core

import (
	"slices"
	"testing"
)

func heights(w *Workspace) map[WindowID]int {
	out := map[WindowID]int{}
	for _, p := range w.Layout() {
		if !p.Floating {
			out[p.ID] = p.Rect.H
		}
	}
	return out
}

func sum(v []int) int {
	t := 0
	for _, x := range v {
		t += x
	}
	return t
}

func TestRowRectsEqualWithoutShares(t *testing.T) {
	r := Rect{X: 0, Y: 0, W: 50, H: 103}
	c := Column{Windows: []WindowID{1, 2, 3}}
	if !slices.Equal(rowRects(r, c, 5), stackRects(r, 3, 5)) {
		t.Fatal(rowRects(r, c, 5))
	}
	c.Shares = []int{50, 50} // wrong length: ignored
	if !slices.Equal(rowRects(r, c, 5), stackRects(r, 3, 5)) {
		t.Fatal(rowRects(r, c, 5))
	}
	c.Shares = []int{50, 30, 30} // wrong sum: ignored
	if !slices.Equal(rowRects(r, c, 5), stackRects(r, 3, 5)) {
		t.Fatal(rowRects(r, c, 5))
	}
	c.Shares = []int{50, 30, 20}
	rows := rowRects(r, c, 5)
	if rows[0].H != 46 || rows[1].H != 27 || rows[2].H != 93-46-27 || rows[2].Y+rows[2].H != 103 {
		t.Fatal(rows)
	}
}

func TestResizeRow(t *testing.T) {
	for _, o := range []Overflow{OverflowScroll, OverflowFixed} {
		w := workspace()
		w.Overflow = o
		w.SetOutput(1000, 800)
		w.Columns = []Column{{Windows: []WindowID{1, 2}}}
		w.Apply("set-window-height +10%")
		if !slices.Equal(w.Columns[0].Shares, []int{60, 40}) {
			t.Fatal(o, w.Columns[0].Shares)
		}
		h := heights(w)
		if h[1] <= h[2] {
			t.Fatal(o, h)
		}
		for range 10 {
			w.Apply("set-window-height +10%")
		}
		if !slices.Equal(w.Columns[0].Shares, []int{90, 10}) {
			t.Fatal(o, w.Columns[0].Shares)
		}
		for range 10 {
			w.Apply("set-window-height -10%")
		}
		if !slices.Equal(w.Columns[0].Shares, []int{10, 90}) {
			t.Fatal(o, w.Columns[0].Shares)
		}
	}
}

func TestResizeRowThree(t *testing.T) {
	w := workspace()
	w.SetOutput(1000, 800)
	w.Columns = []Column{{Windows: []WindowID{1, 2, 3}, Focus: 1}}
	w.Apply("set-window-height +10%")
	s := w.Columns[0].Shares
	if sum(s) != 100 || s[1] != 43 || s[0] < 10 || s[2] < 10 {
		t.Fatal(s)
	}
	for _, step := range []string{"+25%", "+25%", "-7%", "-100%", "+100%", "-3%"} {
		w.Apply(Action("set-window-height " + step))
		s := w.Columns[0].Shares
		if sum(s) != 100 || slices.Min(s) < 10 {
			t.Fatal(step, s)
		}
	}
	if s := w.Columns[0].Shares; s[1] != 77 {
		t.Fatal(s)
	}
	// Proportional: the others shrink by their room above the minimum.
	w.Columns[0].Shares = []int{50, 20, 30}
	w.Columns[0].Focus = 1
	w.Apply("set-window-height +20%")
	if s := w.Columns[0].Shares; !slices.Equal(s, []int{37, 40, 23}) {
		t.Fatal(s)
	}
}

func TestResizeRowNoops(t *testing.T) {
	w := workspace()
	w.Columns = []Column{{Windows: []WindowID{1}}}
	w.Apply("set-window-height +10%")
	if w.Columns[0].Shares != nil {
		t.Fatal(w.Columns[0].Shares)
	}
	w.Columns = []Column{{Windows: []WindowID{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}}}
	w.Apply("set-window-height +10%")
	if w.Columns[0].Shares != nil {
		t.Fatal(w.Columns[0].Shares)
	}
	w.Columns = []Column{{Windows: []WindowID{1, 2}}}
	w.AddFloating(3, 10, 10)
	w.Apply("set-window-height +10%")
	if w.Columns[0].Shares != nil {
		t.Fatal(w.Columns[0].Shares)
	}
	// A fullscreen window hides its column.
	w = workspace()
	w.Columns = []Column{{Windows: []WindowID{1, 2}}}
	w.SetFullscreen(1, true)
	w.Apply("set-window-height +10%")
	if w.Columns[0].Shares != nil {
		t.Fatal(w.Columns[0].Shares)
	}
}

func TestSharesResetAndTravel(t *testing.T) {
	m := monitor()
	m.SetOutput(1000, 800)
	m.AddWindow(1)
	m.AddWindow(2)
	w := m.Current()
	w.ConsumeOrExpel(-1)
	if len(w.Columns) != 1 {
		t.Fatal(w.Columns)
	}
	w.Apply("set-window-height +20%")
	if !slices.Equal(w.Columns[0].Shares, []int{30, 70}) {
		t.Fatal(w.Columns[0].Shares)
	}
	// Moving the window inside the column swaps the shares with it.
	w.Apply(ActionMoveWindowUp)
	if !slices.Equal(w.Columns[0].Shares, []int{70, 30}) || w.Columns[0].Windows[0] != 2 {
		t.Fatal(w.Columns[0])
	}
	// The column takes its shares to another workspace.
	m.MoveToWorkspace(1, true)
	m.FocusNumber(2)
	if c := m.Current().Columns[0]; !slices.Equal(c.Shares, []int{70, 30}) {
		t.Fatal(c)
	}
	// MoveColumn keeps them.
	m.AddWindow(3)
	m.Current().FocusColumn(-1)
	m.Current().MoveColumn(1)
	if c := m.Current().Columns[1]; !slices.Equal(c.Shares, []int{70, 30}) {
		t.Fatal(m.Current().Columns)
	}
	// A window leaving resets the column to equal rows.
	m.RemoveWindow(2)
	m.AddWindow(4)
	w = m.Current()
	for _, c := range w.Columns {
		if c.Shares != nil {
			t.Fatal(w.Columns)
		}
	}
	// A window joining invalidates them: equal rows.
	w.Columns = []Column{{Windows: []WindowID{1, 3}, Shares: []int{80, 20}}}
	w.Columns[0].Windows = append(w.Columns[0].Windows, 4)
	h := heights(w)
	if h[1] != h[3] {
		t.Fatal(h)
	}
}

func TestOverviewPreviewUsesShares(t *testing.T) {
	w := workspace()
	w.SetOutput(1000, 800)
	w.Columns = []Column{{Windows: []WindowID{1, 2}, Shares: []int{70, 30}}}
	tiles, _, _ := w.previewTiles()
	h := map[WindowID]int{}
	for _, p := range tiles {
		h[p.ID] = p.Rect.H
	}
	live := heights(w)
	if h[1] != live[1] || h[2] != live[2] {
		t.Fatal(h, live)
	}
}