// Package table renders an internal.AggregatorWriter as the human-readable
// Anexo J report table, for the terminal (Render) and for embedding in HTML
// documents (RenderHTML).
package table

import (
	"fmt"
	"io"

	"github.com/biter777/countries"
	"github.com/jedib0t/go-pretty/v6/table"
	"github.com/jedib0t/go-pretty/v6/text"
	"github.com/nmoniz/any2anexoj/internal"
)

// translator is the contract the table printer relies on for human-readable
// column labels. *Localizer satisfies it.
type translator interface {
	Translate(key string, count int, values map[string]any) string
}

// Printer writes a simple, human readable, table row to the provided io.Writer for each
// ReportItem received. Render and RenderHTML each build a fresh table.Writer so that
// invoking them (in any order or repeatedly) on the same instance never duplicates rows.
type Printer struct {
	output     io.Writer
	translator translator
}

func NewPrinter(w io.Writer, tr translator) *Printer {
	return &Printer{
		output:     w,
		translator: tr,
	}
}

// buildTable constructs a fully configured table.Writer from the items in aw.
// Each call returns a new table.Writer so callers can render the same data
// multiple times without duplicating rows. The returned table is not wired to
// pp.output via an output mirror; callers that want the rendered output
// written to pp.output must set the mirror themselves before calling .Render().
func (pp *Printer) buildTable(aw *internal.AggregatorWriter) table.Writer {
	tw := table.NewWriter()
	tw.SetAutoIndex(true)
	tw.SetStyle(table.StyleLight)
	tw.SetColumnConfigs([]table.ColumnConfig{
		colCountry(1),
		colOther(2),
		colOther(3),
		colOther(4),
		colOther(5),
		colEuros(6),
		colOther(7),
		colOther(8),
		colOther(9),
		colEuros(10),
		colEuros(11),
		colEuros(12),
		colCountry(13),
	})

	realizationTxt := pp.translator.Translate("realization", 1, nil)
	acquisitionTxt := pp.translator.Translate("acquisition", 1, nil)
	yearTxt := pp.translator.Translate("year", 1, nil)
	monthTxt := pp.translator.Translate("month", 1, nil)
	dayTxt := pp.translator.Translate("day", 1, nil)
	valorTxt := pp.translator.Translate("value", 1, nil)

	tw.AppendHeader(table.Row{"", "", realizationTxt, realizationTxt, realizationTxt, realizationTxt, acquisitionTxt, acquisitionTxt, acquisitionTxt, acquisitionTxt, "", "", ""}, table.RowConfig{AutoMerge: true})
	tw.AppendHeader(table.Row{
		pp.translator.Translate("source_country", 1, nil), pp.translator.Translate("code", 1, nil),
		yearTxt, monthTxt, dayTxt, valorTxt,
		yearTxt, monthTxt, dayTxt, valorTxt,
		pp.translator.Translate("expenses", 2, nil), pp.translator.Translate("foreign_tax_paid", 1, nil), pp.translator.Translate("counter_country", 1, nil),
	})

	for ri := range aw.Iter() {
		tw.AppendRow(table.Row{
			ri.AssetCountry, ri.Nature,
			ri.SellTimestamp.Year(), int(ri.SellTimestamp.Month()), ri.SellTimestamp.Day(), ri.SellValue.StringFixed(2),
			ri.BuyTimestamp.Year(), int(ri.BuyTimestamp.Month()), ri.BuyTimestamp.Day(), ri.BuyValue.StringFixed(2),
			ri.Fees.StringFixed(2), ri.Taxes.StringFixed(2), ri.BrokerCountry,
		})
	}

	sumTxt := pp.translator.Translate("sum", 1, nil)
	// The footer lists one cell per column (13) so it never relies on
	// go-pretty's implicit short-row padding; the trailing empty cell is the
	// counter-country column, which has no total. Totals are formatted with
	// StringFixed(2) so they match the two-decimal data rows.
	tw.AppendFooter(table.Row{sumTxt, sumTxt, sumTxt, sumTxt, sumTxt, aw.TotalEarned().StringFixed(2), "", "", "", aw.TotalSpent().StringFixed(2), aw.TotalFees().StringFixed(2), aw.TotalTaxes().StringFixed(2), ""}, table.RowConfig{AutoMerge: true, AutoMergeAlign: text.AlignRight})

	return tw
}

func (pp *Printer) Render(aw *internal.AggregatorWriter) {
	t := pp.buildTable(aw)
	t.SetOutputMirror(pp.output)
	t.Render()
}

// RenderHTML builds a fresh table from aw and renders it as an HTML string
// using go-pretty's HTMLOptions.
func (pp *Printer) RenderHTML(aw *internal.AggregatorWriter) string {
	t := pp.buildTable(aw)
	t.Style().HTML = table.HTMLOptions{
		CSSClass:    "table table-striped table-hover table-bordered",
		EscapeText:  true,
		Newline:     "<br/>",
		EmptyColumn: "&nbsp;",
	}
	return t.RenderHTML()
}

func colEuros(n int) table.ColumnConfig {
	return table.ColumnConfig{
		Number:      n,
		Align:       text.AlignRight,
		AlignFooter: text.AlignRight,
		AlignHeader: text.AlignRight,
		WidthMin:    12,
		WidthMax:    15,
		Transformer: func(val any) string {
			return fmt.Sprintf("%v €", val)
		},
		TransformerFooter: func(val any) string {
			return fmt.Sprintf("%v €", val)
		},
	}
}

func colOther(n int) table.ColumnConfig {
	return table.ColumnConfig{
		Number:      n,
		Align:       text.AlignLeft,
		AlignFooter: text.AlignLeft,
		AlignHeader: text.AlignLeft,
		WidthMax:    12,
	}
}

func colCountry(n int) table.ColumnConfig {
	return table.ColumnConfig{
		Number:           n,
		Align:            text.AlignLeft,
		AlignFooter:      text.AlignLeft,
		AlignHeader:      text.AlignLeft,
		WidthMax:         24,
		WidthMaxEnforcer: text.Trim,
		Transformer: func(val any) string {
			countryCode := val.(int64)
			return fmt.Sprintf("%v - %s", val, countries.ByNumeric(int(countryCode)).Info().Name)
		},
	}
}