package dashboard

import (
	"cpone-dashboard/menu/auth"
	"cpone-dashboard/menu/projects"
	"embed"
	"encoding/json"
	"html/template"
	"log"
	"net/http"
	"strconv"
	"time"
)

var templateFS *embed.FS
var funcMap template.FuncMap

type StationsPartial struct {
	Rows   []StationRow
	IsLive bool
}

type ArrivalsPartial struct {
	Rows   []ArrivalRow
	IsLive bool
}

type PatientsPartial struct {
	Patients []PatientDetail
	IsRange  bool
}

type PageData struct {
	Username       string
	McuID          int
	Project        ProjectInfo
	CurrentProject projects.ProjectItem
	AvailableDates []string
	Mode           string
	DateFrom       string
	DateTo         string
	IsRange        bool
	IsLive         bool
	KPI            KPIData
	TAT            TATData
	Stations       []StationRow
	Arrivals       []ArrivalRow
	TATChart       template.JS
	TrendChart     template.JS
}

var basePath string

func SetTemplateFS(fs *embed.FS)           { templateFS = fs }
func SetTemplateFuncs(fm template.FuncMap) { funcMap = fm }
func SetBasePath(p string)                 { basePath = p }

func parse(files ...string) *template.Template {
	return template.Must(template.New("").Funcs(funcMap).ParseFS(templateFS, files...))
}

func defaultDailyDate(project ProjectInfo) string {
	today := time.Now().Format("2006-01-02")
	if project.StartDate == "" {
		return today
	}
	if project.EndDate != "" && today > project.EndDate {
		return project.StartDate
	}
	if today < project.StartDate {
		return project.StartDate
	}
	return today
}

func containsDate(dates []string, target string) bool {
	for _, d := range dates {
		if d == target {
			return true
		}
	}
	return false
}

func activeDateRange(r *http.Request, project ProjectInfo, availableDates []string) (mode, from, to string) {
	mode = "daily"
	reqDate := r.URL.Query().Get("date")

	switch {
	case reqDate != "" && containsDate(availableDates, reqDate):
		from = reqDate
	case containsDate(availableDates, time.Now().Format("2006-01-02")):
		from = time.Now().Format("2006-01-02")
	case len(availableDates) > 0:
		from = availableDates[0]
	default:
		from = defaultDailyDate(project)
	}
	to = from
	return
}

func activeMcuID(r *http.Request) int {
	if id, _ := strconv.Atoi(r.URL.Query().Get("mcu_id")); id > 0 {
		return id
	}
	return auth.SelectedProjectID(r)
}

func toJS(v interface{}) template.JS {
	b, _ := json.Marshal(v)
	return template.JS(b)
}

func Index(w http.ResponseWriter, r *http.Request) {
	mcuID := activeMcuID(r)
	username := auth.Username(r)

	if mcuID == 0 {
		http.Redirect(w, r, basePath+"/projects", http.StatusSeeOther)
		return
	}

	ok, err := projects.HasAccess(username, mcuID)
	if err != nil {
		log.Printf("[dashboard] HasAccess error: %v", err)
		http.Error(w, "query error", http.StatusInternalServerError)
		return
	}
	if !ok {
		http.Redirect(w, r, basePath+"/projects", http.StatusSeeOther)
		return
	}

	project, err := GetProject(mcuID)
	if err != nil {
		log.Printf("[dashboard] GetActiveProject error: %v", err)
		http.Error(w, "query error", http.StatusInternalServerError)
		return
	}
	currentProject := projects.ProjectItem{}
	if item, ok, err := projects.GetUserProject(username, mcuID); err != nil {
		log.Printf("[dashboard] GetUserProject error: %v", err)
	} else if ok {
		currentProject = item
		auth.SetSelectedProject(w, mcuID)
	}
	availableDates, err := GetCheckinDates(project.McuID)
	if err != nil {
		log.Printf("[dashboard] GetCheckinDates error: %v", err)
	}
	mode, dateFrom, dateTo := activeDateRange(r, project, availableDates)
	isRange := dateFrom != dateTo

	kpi, err := GetKPI(project.McuID, dateFrom, dateTo)
	if err != nil {
		log.Printf("[dashboard] GetKPI error: %v", err)
	}
	tat, err := GetTAT(project.McuID, dateFrom, dateTo)
	if err != nil {
		log.Printf("[dashboard] GetTAT error: %v", err)
	}
	stations, err := GetStations(project.McuID, dateFrom, dateTo)
	if err != nil {
		log.Printf("[dashboard] GetStations error: %v", err)
	}
	arrivals, err := GetArrivals(project.McuID, dateFrom, dateTo, 8)
	if err != nil {
		log.Printf("[dashboard] GetArrivals error: %v", err)
	}
	hourlyTAT, err := GetPeriodTAT(project.McuID, dateFrom, dateTo, isRange)
	if err != nil {
		log.Printf("[dashboard] GetPeriodTAT error: %v", err)
	}
	trend, err := GetPeriodTrend(project.McuID, dateFrom, dateTo, isRange)
	if err != nil {
		log.Printf("[dashboard] GetPeriodTrend error: %v", err)
	}

	// Build chart JSON payloads
	tatLabels, tatValues := []string{}, []float64{}
	for _, p := range hourlyTAT {
		tatLabels = append(tatLabels, p.Label)
		tatValues = append(tatValues, p.Value)
	}
	trendLabels, trendCI, trendCO := []string{}, []int{}, []int{}
	for _, p := range trend {
		trendLabels = append(trendLabels, p.Label)
		trendCI = append(trendCI, p.CheckedIn)
		trendCO = append(trendCO, p.CheckedOut)
	}

	today := time.Now().Format("2006-01-02")
	data := PageData{
		Username:       username,
		McuID:          project.McuID,
		Project:        project,
		CurrentProject: currentProject,
		AvailableDates: availableDates,
		Mode:           mode,
		DateFrom:       dateFrom,
		DateTo:         dateTo,
		IsRange:        isRange,
		IsLive:         mode == "daily" && dateFrom == today,
		KPI:            kpi,
		TAT:            tat,
		Stations:       stations,
		Arrivals:       arrivals,
		TATChart: toJS(map[string]interface{}{
			"labels": tatLabels,
			"values": tatValues,
		}),
		TrendChart: toJS(map[string]interface{}{
			"labels":     trendLabels,
			"checkedIn":  trendCI,
			"checkedOut": trendCO,
		}),
	}

	t := parse("templates/layout/base.html", "templates/dashboard/index.html")
	if err := t.ExecuteTemplate(w, "base", data); err != nil {
		log.Printf("[dashboard] template error: %v", err)
	}
}

func Patients(w http.ResponseWriter, r *http.Request) {
	project, err := GetProject(activeMcuID(r))
	if err != nil {
		http.Error(w, "query error", http.StatusInternalServerError)
		return
	}
	availableDates, _ := GetCheckinDates(project.McuID)
	mode, dateFrom, dateTo := activeDateRange(r, project, availableDates)
	patients, err := GetAllPatients(project.McuID, dateFrom, dateTo)
	if err != nil {
		log.Printf("[dashboard] GetAllPatients error: %v", err)
		http.Error(w, "query error", http.StatusInternalServerError)
		return
	}
	data := PatientsPartial{
		Patients: patients,
		IsRange:  mode != "daily" || dateFrom != dateTo,
	}
	t := parse("templates/dashboard/partials/patients.html")
	if err := t.ExecuteTemplate(w, "patients", data); err != nil {
		log.Printf("[dashboard] patients template error: %v", err)
	}
}

func KPI(w http.ResponseWriter, r *http.Request) {
	project, _ := GetProject(activeMcuID(r))
	availableDates, _ := GetCheckinDates(project.McuID)
	_, from, to := activeDateRange(r, project, availableDates)
	data, err := GetKPI(project.McuID, from, to)
	if err != nil {
		http.Error(w, "query error", http.StatusInternalServerError)
		return
	}
	t := parse("templates/dashboard/partials/kpi.html")
	t.ExecuteTemplate(w, "kpi", data)
}

func Stations(w http.ResponseWriter, r *http.Request) {
	project, _ := GetProject(activeMcuID(r))
	availableDates, _ := GetCheckinDates(project.McuID)
	_, from, to := activeDateRange(r, project, availableDates)
	rows, err := GetStations(project.McuID, from, to)
	if err != nil {
		http.Error(w, "query error", http.StatusInternalServerError)
		return
	}
	t := parse("templates/dashboard/partials/stations.html")
	t.ExecuteTemplate(w, "stations", StationsPartial{Rows: rows, IsLive: from == time.Now().Format("2006-01-02")})
}

func Arrivals(w http.ResponseWriter, r *http.Request) {
	project, _ := GetProject(activeMcuID(r))
	availableDates, _ := GetCheckinDates(project.McuID)
	_, from, to := activeDateRange(r, project, availableDates)
	rows, err := GetArrivals(project.McuID, from, to, 8)
	if err != nil {
		http.Error(w, "query error", http.StatusInternalServerError)
		return
	}
	t := parse("templates/dashboard/partials/arrivals.html")
	t.ExecuteTemplate(w, "arrivals", rows)
}