package tui

import (
	"fmt"
	"strings"
	"time"

	tea "github.com/charmbracelet/bubbletea"

	"github.com/lerko/nib/internal/db"
	"github.com/lerko/nib/internal/display"
)

type detailModel struct {
	entity *db.Entity
	scroll int
	height int
	width  int
}

func newDetailModel() detailModel {
	return detailModel{}
}

func (d *detailModel) setEntity(e *db.Entity) {
	d.entity = e
	d.scroll = 0
}

func (d *detailModel) setSize(width, height int) {
	d.width = width
	d.height = height
}

func (d detailModel) update(msg tea.KeyMsg) detailModel {
	switch msg.String() {
	case "up", "k":
		if d.scroll > 0 {
			d.scroll--
		}
	case "down", "j":
		d.scroll++
	}
	return d
}

func (d detailModel) view(width int) string {
	if d.entity == nil {
		return ""
	}

	e := d.entity
	var b strings.Builder

	glyph := display.DisplayGlyph(e.Glyph, e.CardType)
	header := fmt.Sprintf("%s  %s", glyph, display.FormatID(e.ID))
	b.WriteString(detailHeaderStyle.Render(header))
	b.WriteString("\n\n")

	if e.Title != nil {
		b.WriteString(detailBodyStyle.Render("title: " + *e.Title))
		b.WriteString("\n")
	}

	b.WriteString(detailBodyStyle.Render(e.Body))
	b.WriteString("\n")

	if len(e.Tags) > 0 {
		tagParts := make([]string, len(e.Tags))
		for i, t := range e.Tags {
			tagParts[i] = tagStyle.Render("#" + t)
		}
		b.WriteString("\n")
		b.WriteString(detailBodyStyle.Render(strings.Join(tagParts, " ")))
		b.WriteString("\n")
	}

	b.WriteString("\n")
	meta := fmt.Sprintf("created  %s", e.CreatedAt.Format(time.DateTime))
	if e.ModifiedAt != e.CreatedAt {
		meta += fmt.Sprintf("\nmodified %s", e.ModifiedAt.Format(time.DateTime))
	}
	if e.TimeAnchor != nil {
		meta += fmt.Sprintf("\nanchored @%s", *e.TimeAnchor)
	}
	if e.Pinned {
		meta += "\npinned"
	}
	if e.CardType != nil {
		meta += fmt.Sprintf("\ncard     %s", *e.CardType)
	}
	if e.CompletedAt != nil {
		meta += fmt.Sprintf("\ndone     %s", e.CompletedAt.Format(time.DateTime))
	}
	b.WriteString(idStyle.Render(meta))

	lines := strings.Split(b.String(), "\n")
	if d.scroll > 0 && d.scroll < len(lines) {
		lines = lines[d.scroll:]
	}
	if d.height > 0 && len(lines) > d.height {
		lines = lines[:d.height]
	}

	return strings.Join(lines, "\n")
}