// Package table provides a simple table component for Bubble Tea applications.
package table

import (
	"strings"

	"github.com/charmbracelet/bubbles/v2/help"
	"github.com/charmbracelet/bubbles/v2/key"
	"github.com/charmbracelet/lipgloss/v2/table"
	tea "github.com/charmbracelet/bubbletea/v2"
	"github.com/charmbracelet/lipgloss/v2"
)

// Model defines a state for the table widget.
type Model struct {
	KeyMap KeyMap
	Help   help.Model

	headers   []string
	rows   [][]string
	cursor int
	focus  bool
	styles Styles
	yOffset int

	table *table.Table
}

// KeyMap defines keybindings. It satisfies to the help.KeyMap interface, which
// is used to render the help menu.
type KeyMap struct {
	LineUp       key.Binding
	LineDown     key.Binding
	PageUp       key.Binding
	PageDown     key.Binding
	HalfPageUp   key.Binding
	HalfPageDown key.Binding
	GotoTop      key.Binding
	GotoBottom   key.Binding
}

// ShortHelp implements the KeyMap interface.
func (km KeyMap) ShortHelp() []key.Binding {
	return []key.Binding{km.LineUp, km.LineDown}
}

// FullHelp implements the KeyMap interface.
func (km KeyMap) FullHelp() [][]key.Binding {
	return [][]key.Binding{
		{km.LineUp, km.LineDown, km.GotoTop, km.GotoBottom},
		{km.PageUp, km.PageDown, km.HalfPageUp, km.HalfPageDown},
	}
}

// DefaultKeyMap returns a default set of keybindings.
func DefaultKeyMap() KeyMap {
	return KeyMap{
		LineUp: key.NewBinding(
			key.WithKeys("up", "k"),
			key.WithHelp("↑/k", "up"),
		),
		LineDown: key.NewBinding(
			key.WithKeys("down", "j"),
			key.WithHelp("↓/j", "down"),
		),
		PageUp: key.NewBinding(
			key.WithKeys("b", "pgup"),
			key.WithHelp("b/pgup", "page up"),
		),
		PageDown: key.NewBinding(
			key.WithKeys("f", "pgdown", "space"),
			key.WithHelp("f/pgdn", "page down"),
		),
		HalfPageUp: key.NewBinding(
			key.WithKeys("u", "ctrl+u"),
			key.WithHelp("u", "½ page up"),
		),
		HalfPageDown: key.NewBinding(
			key.WithKeys("d", "ctrl+d"),
			key.WithHelp("d", "½ page down"),
		),
		GotoTop: key.NewBinding(
			key.WithKeys("home", "g"),
			key.WithHelp("g/home", "go to start"),
		),
		GotoBottom: key.NewBinding(
			key.WithKeys("end", "G"),
			key.WithHelp("G/end", "go to end"),
		),
	}
}

// Styles contains style definitions for this list component. By default, these
// values are generated by DefaultStyles.
type Styles struct {
	Border       lipgloss.Border
	BorderStyle  lipgloss.Style
	BorderTop    bool
	BorderBottom bool
	BorderLeft   bool
	BorderRight  bool
	BorderColumn bool
	BorderHeader bool
	BorderRow    bool

	Header   lipgloss.Style
	Cell     lipgloss.Style
	Selected lipgloss.Style
}

 func DefaultStyles() Styles {
	return Styles{
		Header: lipgloss.NewStyle().Bold(true).Padding(0, 1),
		Cell: lipgloss.NewStyle().Margin(0, 1),
		Selected: lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("212")).Margin(0, 1),
	}
 }

func NewFromTemplate(t *table.Table, rows [][]string, headers []string) *Model {
	m := &Model{
		cursor:   0,
		KeyMap: DefaultKeyMap(),
		Help:   help.New(),
		table: t,
	}
	m.SetRows(rows...)
	m.SetHeaders(headers...)

	return m
}
// SetBorder is a shorthand function for setting or unsetting borders on a
// table. The arguments work as follows:
//
// With one argument, the argument is applied to all sides.
//
// With two arguments, the arguments are applied to the vertical and horizontal
// sides, in that order.
//
// With three arguments, the arguments are applied to the top side, the
// horizontal sides, and the bottom side, in that order.
//
// With four arguments, the arguments are applied clockwise starting from the
// top side, followed by the right side, then the bottom, and finally the left.
//
// With five arguments, the arguments are applied clockwise starting from the
// top side, followed by the right side, then the bottom, and finally the left.
// The final value will set the row separator.
//
// With six arguments, the arguments are applied clockwise starting from the
// top side, followed by the right side, then the bottom, and finally the left.
// The final two values will set the row and column separators in that order.
//
// With more than four arguments nothing will be set.
func (m *Model) SetBorder(s ...bool) {
	m.table.Border(m.styles.Border)
	top, right, bottom, left, rowSeparator, columnSeparator := m.whichSides(s...)
	m.table.
		BorderTop(top).
		BorderRight(right).
		BorderBottom(bottom).
		BorderLeft(left).
		BorderRow(rowSeparator).
		BorderColumn(columnSeparator)
}

// Border sets the top border.
func (m *Model) Border(border lipgloss.Border) *Model {
	m.table.Border(border)
	return m
}

// BorderBottom sets the bottom border.
func (m *Model) BorderBottom(v bool) *Model {
	m.table.BorderBottom(v)
	return m
}

// BorderTop sets the top border.
func (m *Model) BorderTop(v bool) *Model {
	m.table.BorderTop(v)
	return m
}

// BorderLeft sets the left border.
func (m *Model) BorderLeft(v bool) *Model {
	m.table.BorderLeft(v)
	return m
}

// BorderRight sets the right border.
func (m *Model) BorderRight(v bool) *Model {
	m.table.BorderRight(v)
	return m
}

// BorderColumn sets the column border.
func (m *Model) BorderColumn(v bool) *Model {
	m.table.BorderColumn(v)
	return m
}

// BorderHeader sets the header's border.
func (m *Model) BorderHeader(v bool) *Model {
	m.table.BorderHeader(v)
	return m
}

// BorderRow sets the row borders.
func (m *Model) BorderRow(v bool) *Model {
	m.table.BorderRow(v)
	return m
}

// BorderStyle sets the style for the table border.
func (m *Model) BorderStyle(style lipgloss.Style) *Model {
	m.table.BorderStyle(style)
	return m
}

// whichSides is a helper method for setting values on sides of a block based on
// the number of arguments given.
// 0: set all sides to true
// 1: set all sides to given arg
// 2: top -> bottom
// 3: top -> horizontal -> bottom
// 4: top -> right -> bottom -> left
// 5: top -> right -> bottom -> left -> rowSeparator
// 6: top -> right -> bottom -> left -> rowSeparator -> columnSeparator
func (m Model) whichSides(s ...bool) (top, right, bottom, left, rowSeparator, columnSeparator bool) {
	// set the separators to true unless otherwise set.
	rowSeparator = m.styles.BorderRow
	columnSeparator = m.styles.BorderColumn

	switch len(s) {
	case 1:
		top = s[0]
		right = s[0]
		bottom = s[0]
		left = s[0]
		rowSeparator = s[0]
		columnSeparator = s[0]
	case 2:
		top = s[0]
		right = s[1]
		bottom = s[0]
		left = s[1]
	case 3:
		top = s[0]
		right = s[1]
		bottom = s[2]
		left = s[1]
	case 4:
		top = s[0]
		right = s[1]
		bottom = s[2]
		left = s[3]
	case 5:
		top = s[0]
		right = s[1]
		bottom = s[2]
		left = s[3]
		rowSeparator = s[4]
	case 6:
		top = s[0]
		right = s[1]
		bottom = s[2]
		left = s[3]
		rowSeparator = s[4]
		columnSeparator = s[5]
	default:
		top = m.styles.BorderTop
		right = m.styles.BorderRight
		bottom = m.styles.BorderBottom
		left = m.styles.BorderLeft
	}
	return top, right, bottom, left, rowSeparator, columnSeparator
 }


// Option is used to set options in New. For example:
//
//	table := New(WithColumns([]Column{{Title: "ID", Width: 10}}))
type Option func(*Model)

// New creates a new model for the table widget.
func New(opts ...Option) Model {
	m := Model{
		cursor:   0,
		KeyMap: DefaultKeyMap(),
		Help:   help.New(),
		styles: DefaultStyles(),
	}

	for _, opt := range opts {
		opt(&m)
	}

	return m
}

func (m *Model) SetHeaders(headers ...string) *Model {
	m.headers = headers
	m.table.Headers(headers...)
	return m
}

// WithColumns sets the table columns (headers).
func WithHeaders(headers ...string) Option {
	return func(m *Model) {
		m.headers = headers
		m.table.Headers(headers...)
	}
}

func (m *Model) SetRows(rows ...[]string) *Model {
	m.rows = rows
	m.table.Rows(rows...)
	return m
}

// WithRows sets the table rows (data).
func WithRows(rows ...[]string) Option {
	return func(m *Model) {
		m.rows = rows
	}
}

func (m *Model) SetHeight(h int) *Model {
	m.table.Height(h)
	return m
}

// WithHeight sets the height of the table.
func WithHeight(h int) Option {
	return func(m *Model) {
		m.table.Height(h)
	}
}

func (m *Model) SetWidth(w int) *Model {
	m.table.Width(w)
	return m
}

// WithWidth sets the width of the table.
func WithWidth(w int) Option {
	return func(m *Model) {
		m.table.Width(w)
	}
}

func (m *Model) SetFocused(f bool) *Model {
	m.focus = f
	return m
}

// WithFocused sets the focus state of the table.
func WithFocused(f bool) Option {
	return func(m *Model) {
		m.focus = f
	}
}

 // SetStyles sets the table styles.
func (m *Model) SetStyles(t *table.Table) {
	t.Rows(m.rows...)
	t.Headers(m.headers...)
	m.table = t
}

// SetStyleFunc sets the table's custom StyleFunc. Use this for conditional
// styling e.g. styling a cell by its contents or by index.
func (m *Model) SetStyleFunc(s table.StyleFunc) {
	m.table.StyleFunc(s)
}

// WithStyles sets the table styles.
func WithStyles(t *table.Table) Option {
	return func(m *Model) {
		m.SetStyles(t)
	}
}

// WithStyleFunc sets the table StyleFunc for conditional styling.
func WithStyleFunc(s table.StyleFunc) Option {
	return func(m *Model) {
		m.table.StyleFunc(s)
	}
}

// WithKeyMap sets the key map.
func WithKeyMap(km KeyMap) Option {
	return func(m *Model) {
		m.KeyMap = km
	}
}

// Update is the Bubble Tea update loop.
func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
	if !m.focus {
		return m, nil
	}
	height := len(m.rows)

	switch msg := msg.(type) {
	case tea.KeyPressMsg:
		switch {
		case key.Matches(msg, m.KeyMap.LineUp):
			m.MoveUp(1)
		case key.Matches(msg, m.KeyMap.LineDown):
			m.MoveDown(1)
		case key.Matches(msg, m.KeyMap.PageUp):
			m.MoveUp(height)
		case key.Matches(msg, m.KeyMap.PageDown):
			m.MoveDown(height)
		case key.Matches(msg, m.KeyMap.HalfPageUp):
			m.MoveUp(height / 2) //nolint:mnd
		case key.Matches(msg, m.KeyMap.HalfPageDown):
			m.MoveDown(height / 2) //nolint:mnd
		case key.Matches(msg, m.KeyMap.GotoTop):
			m.GotoTop()
		case key.Matches(msg, m.KeyMap.GotoBottom):
			m.GotoBottom()
		}
	}

	return m, nil
}

// Focused returns the focus state of the table.
func (m Model) Focused() bool {
	return m.focus
}

// Focus focuses the table, allowing the user to move around the rows and
// interact.
func (m *Model) Focus() {
	m.focus = true
}

// Blur blurs the table, preventing selection or movement.
func (m *Model) Blur() {
	m.focus = false
}

// View renders the component.
func (m Model) View() string {
	return m.table.String()
}

// HelpView is a helper method for rendering the help menu from the keymap.
// Note that this view is not rendered by default and you must call it
// manually in your application, where applicable.
func (m Model) HelpView() string {
	return m.Help.View(m.KeyMap)
}

// Rows returns the current rows.
func (m Model) Rows() [][]string {
	return m.rows
}

// GetHeaders returns the current headers.
func (m Model) Headers() []string {
	return m.headers
}

// WithWidth sets the width of the viewport of the table.
func (m *Model) WithWidth(w int) {
	m.table.Width(w)
}

// WithHeight sets the height of the viewport of the table.
func (m *Model) WithHeight(h int) {
	m.table.Height(h)
}

// TODO add docs to use lipgloss.Height and lipgloss.Width to get table height/width

// Cursor returns the index of the selected row.
func (m Model) Cursor() int {
	return m.cursor
}

// WithCursor sets the cursor position in the table.
func (m *Model) WithCursor(n int) {
	m.cursor = clamp(n, 0, len(m.rows)-1)
}

// SetYOffset sets the YOffset position in the table.
func (m *Model) SetYOffset(n int) {
	m.yOffset = clamp(n, 0, len(m.rows)-1)
	m.table.YOffset(m.yOffset)
}

// MoveUp moves the selection up by any number of rows.
// It can not go above the first row.
func (m *Model) MoveUp(n int) {
	m.WithCursor(m.cursor - n)

	// only set the offset outside of the last available rows.
	m.SetYOffset(m.yOffset - n)
	m.table.YOffset(m.yOffset)
}

// MoveDown moves the selection down by any number of rows.
// It can not go below the last row.
func (m *Model) MoveDown(n int) {
	// Once we're at the last set of rows, where there is no truncation
	// stop setting the y offset and only move cursor
	// Only move cursor on first and last pages
	m.WithCursor(m.cursor + n)

	// only set the offset outside of the last available rows.
	m.SetYOffset(m.yOffset + n)
	m.table.YOffset(m.yOffset)
}


// GotoTop moves the selection to the first row.
func (m *Model) GotoTop() {
	m.MoveUp(m.cursor)
}

// GotoBottom moves the selection to the last row.
func (m *Model) GotoBottom() {
	m.MoveDown(len(m.rows))
}

// FromValues create the table rows from a simple string. It uses `\n` by
// default for getting all the rows and the given separator for the fields on
// each row.
func (m *Model) FromValues(value, separator string) {
	var rows [][]string
	for i, line := range strings.Split(value, "\n") {
		for j, field := range strings.Split(line, separator) {
			rows[i][j] = field
		}
	}

	m.SetRows(rows...)
}

// TODO remove this
// func (m Model) headersView() string {
// 	s := make([]string, 0, len(m.headers))
// 	for _, col := range m.headers {
// 		if col.Width <= 0 {
// 			continue
// 		}
// 		style := lipgloss.NewStyle().Width(col.Width).MaxWidth(col.Width).Inline(true)
// 		renderedCell := style.Render(runewidth.Truncate(col.Title, col.Width, "…"))
// 		s = append(s, m.styles.Header.Render(renderedCell))
// 	}
// 	return lipgloss.JoinHorizontal(lipgloss.Top, s...)
// }

// func (m *Model) renderRow(r int) string {
// 	s := make([]string, 0, len(m.headers))
// 	for i, value := range m.rows[r] {
// 		if m.headers[i].Width <= 0 {
// 			continue
// 		}
// 		style := lipgloss.NewStyle().Width(m.headers[i].Width).MaxWidth(m.headers[i].Width).Inline(true)
// 		renderedCell := m.styles.Cell.Render(style.Render(runewidth.Truncate(value, m.headers[i].Width, "…")))
// 		s = append(s, renderedCell)
// 	}
//
// 	row := lipgloss.JoinHorizontal(lipgloss.Top, s...)
//
// 	if r == m.cursor {
// 		return m.styles.Selected.Render(row)
// 	}
//
// 	return row
// }

func clamp(v, low, high int) int {
	return min(max(v, low), high)
}