package inflation

import (
	"embed"
	"fmt"
	"html/template"
	"io"
	"net/http"
	"os"
	"time"

	"git.tijl.dev/tijl/tijl.dev-core/internal/config"
	"git.tijl.dev/tijl/tijl.dev-core/modules/i18n"
	log "git.tijl.dev/tijl/tijl.dev-core/modules/logger"
	"git.tijl.dev/tijl/tijl.dev-core/modules/web"
	"github.com/go-echarts/go-echarts/v2/charts"
	"github.com/go-echarts/go-echarts/v2/opts"
	"github.com/gofiber/fiber/v2"
)

type Datas struct {
	Name            string
	ProcessFunction func(map[time.Time]float32) map[time.Time]float32
}

var rawData = make(map[string]map[time.Time]float32)

var datas = map[string]Datas{
	"CPIAUCSL": {
		Name:            "CPI USA BASE",
		ProcessFunction: toPercentNeg,
	},
	"PCEPI": {
		Name:            "PCECPI USA",
		ProcessFunction: toPercentNeg,
	},
	"M2SL": {
		Name:            "M2 USA",
		ProcessFunction: toPercentNeg,
	},
	"CP0000EZ19M086NEST": {
		Name:            "HICP ECB",
		ProcessFunction: toPercentNeg,
	},
	"MABMM301EZM189S": {
		Name:            "M3 ECB",
		ProcessFunction: toPercentNeg,
	},
	"CBBTCUSD": {
		Name:            "Bitcoin",
		ProcessFunction: toPercent,
	},
	"APU0000708111": {
		Name:            "Eggs",
		ProcessFunction: toPercent,
	},
}

//go:embed locales/*
var Embed embed.FS

func Setup() {
	err := LoadData()
	if err != nil {
		log.Error().Err(err).Msg("inflation.Setup: Error loading data")
	}

	i18n.RegisterTranslations(Embed, "locales")

	web.RegisterAppSetupFunc(func(a *fiber.App) {
		a.Get("app/inflation", func(c *fiber.Ctx) error {
			processedData := make(map[string]map[time.Time]float32)
			for id, data := range datas {
				processedData[id] = data.ProcessFunction(rawData[id])
			}

			line := charts.NewLine()

			startYear, endYear := getYearRange(processedData)
			yearList := createYearList(startYear, endYear)
			for seriesID, timeData := range processedData {

				aggregatedData := aggregateDataByYear(timeData)

				yAxisT := []opts.LineData{}
				var useAmount float32 = 1
				for _, year := range yearList {
					if value, exists := aggregatedData[year]; exists {

						current := (value / 100) * useAmount
						useAmount = useAmount + current
						yAxisT = append(yAxisT, opts.LineData{Value: useAmount})
					} else {
						yAxisT = append(yAxisT, opts.LineData{Value: nil})
					}
				}

				line.AddSeries(datas[seriesID].Name, yAxisT)
			}

			line.SetXAxis(yearList)

			line.SetGlobalOptions(
				charts.WithTitleOpts(opts.Title{
					Title:    "Inflation",
					Subtitle: "Copyright Tijl 2024",
				}),
				charts.WithDataZoomOpts(opts.DataZoom{
					Orient: "horizontal",
					Type:   "slider",
				}),
			)

			rendered := line.RenderSnippet()

			data := *web.Common(c)
			data["Title"] = "tmp"
			data["RenderedScript"] = template.JS(handleScriptElement(rendered.Script))
			data["RenderedElement"] = template.HTML(rendered.Element)
			return c.Render("apps/inflation/index", data, "layouts/base")

		})
		a.Get("/app/inflation/base", func(c *fiber.Ctx) error {

			processedData := make(map[string]map[time.Time]float32)
			for id, data := range datas {
				processedData[id] = data.ProcessFunction(rawData[id])
			}

			line := charts.NewLine()

			startYear, endYear := getYearRange(processedData)
			yearList := createYearList(startYear, endYear)
			for seriesID, timeData := range processedData {

				aggregatedData := aggregateDataByYear(timeData)

				yAxisT := []opts.LineData{}
				for _, year := range yearList {
					if value, exists := aggregatedData[year]; exists {
						yAxisT = append(yAxisT, opts.LineData{Value: value})
					} else {
						yAxisT = append(yAxisT, opts.LineData{Value: nil})
					}
				}

				line.AddSeries(datas[seriesID].Name, yAxisT)
			}

			line.SetXAxis(yearList)

			line.SetGlobalOptions(
				charts.WithTitleOpts(opts.Title{
					Title:    "Inflation",
					Subtitle: "Copyright Tijl 2024",
				}),
				charts.WithDataZoomOpts(opts.DataZoom{
					Orient: "horizontal",
					Type:   "slider",
				}),
			)

			rendered := line.RenderSnippet()

			data := *web.Common(c)
			data["Title"] = "tmp"
			data["RenderedScript"] = template.JS(handleScriptElement(rendered.Script))
			data["RenderedElement"] = template.HTML(rendered.Element)
			return c.Render("apps/inflation/index", data, "layouts/base")
		})
	}, 1000)
}

func LoadData() error {

	var baseDataPath = config.Config.DataLocation + "/apps/inflation/data/"
	if _, err := os.Stat(baseDataPath); os.IsNotExist(err) {
		err := os.MkdirAll(baseDataPath, os.ModePerm)
		if err != nil {
			return err
		}
	}

	// Load fred data
	const fredBaseUrl = "https://fred.stlouisfed.org/graph/fredgraph.csv?id="

	for id := range datas {
		info, err := os.Stat(baseDataPath + id + ".csv")
		if !os.IsNotExist(err) {
			modTime := info.ModTime()
			currentTime := time.Now()

			if modTime.Year() == currentTime.Year() && modTime.Month() == currentTime.Month() {
				csvdata, err := readCSV(baseDataPath + id + ".csv")
				if err != nil {
					return err
				}
				rawData[id] = csvdata
				continue
			}
		}

		resp, err := http.Get(fredBaseUrl + id)
		log.Debug().Str("id", id).Msg("inflation.LoadData: getting")
		if err != nil {
			return err
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			return fmt.Errorf("failed to fetch data: %v", resp.Status)
		}

		file, err := os.Create(baseDataPath + id + ".csv")
		if err != nil {
			return err
		}
		defer file.Close()

		_, err = io.Copy(file, resp.Body)
		if err != nil {
			return err
		}

		csvdata, err := readCSV(baseDataPath + id + ".csv")
		if err != nil {
			return err
		}
		rawData[id] = csvdata
	}

	return nil
}