package panes

import (
	"fmt"
	"strings"

	"github.com/charmbracelet/x/ansi"

	"git.kebcloud.no/keb/lazysecrets/internal/ui/styles"
)

// SourceDetail is the fourth pane on a provider's row: what's known about
// its account, one field per row, to move through and copy from.
type SourceDetail struct {
	title  string
	fields []Field
	sel    int
	w, h   int
}

// Field is a row: a value under a label. Info rows (loading, errors)
// can't be copied.
type Field struct {
	Label, Value string
	Info         bool
}

// Set shows fields under title, keeping the cursor where it was for the
// same title.
func (s *SourceDetail) Set(title string, fields []Field) {
	if title != s.title {
		s.sel = 0
	}
	s.title, s.fields = title, fields
	s.sel = max(0, min(s.sel, len(fields)-1))
}

// Shown reports whether there's anything to show.
func (s SourceDetail) Shown() bool { return len(s.fields) > 0 }

func (s *SourceDetail) SetSize(w, h int) { s.w, s.h = w, h }

func (s *SourceDetail) Move(delta int) { s.sel = max(0, min(s.sel+delta, len(s.fields)-1)) }
func (s *SourceDetail) Top()           { s.sel = 0 }
func (s *SourceDetail) Bottom()        { s.sel = max(0, len(s.fields)-1) }

// Selected is the field under the cursor, unless it's an info row.
func (s SourceDetail) Selected() (Field, bool) {
	if s.sel >= len(s.fields) || s.fields[s.sel].Info {
		return Field{}, false
	}
	return s.fields[s.sel], true
}

func (s SourceDetail) View(st styles.Styles, focused bool) string {
	inner := max(1, s.w-2)
	rows := max(0, s.h-2)
	offset := 0
	if s.sel >= rows { // keep the cursor in view
		offset = s.sel - rows + 1
	}
	var body []string
	for i, f := range s.fields[min(offset, len(s.fields)):] {
		if i >= rows {
			break
		}
		value := f.Value
		if f.Info {
			value = st.Muted.Render(value)
		}
		line := " " + st.Label.Render(fmt.Sprintf("%-10s", f.Label)) + " " + value
		line = ansi.Truncate(line, inner, "…")
		if i+offset == s.sel {
			pad := strings.Repeat(" ", max(0, inner-ansi.StringWidth(line)))
			if focused {
				line = st.Selected.Render(ansi.Strip(line) + pad)
			} else {
				line = st.SelectedBlurred.Render(ansi.Strip(line) + pad)
			}
		}
		body = append(body, line)
	}
	footer := ""
	if len(s.fields) > rows {
		footer = fmt.Sprintf("%d of %d", s.sel+1, len(s.fields))
	}
	return Box(st, TitleStyle(st, focused).Render(s.title), footer, body, s.w, s.h, focused)
}