package main

import (
	"fmt"
	"os"

	wailsruntime "github.com/wailsapp/wails/v2/pkg/runtime"

	"verstak/internal/core/worklog"
	syncsvc "verstak/internal/core/sync"
)

func (a *App) ListWorklog(nodeID string) ([]WorklogDTO, error) {
	list, err := a.worklog.ListByNode(nodeID)
	if err != nil {
		return nil, err
	}
	return toWorklogDTOs(list), nil
}

func (a *App) CreateWorklog(nodeID, summary string, minutes int) (*WorklogDTO, error) {
	return a.CreateWorklogFull(nodeID, summary, "", "", minutes, false, false)
}

func (a *App) CreateWorklogFull(nodeID, summary, details, date string, minutes int, approximate, billable bool) (*WorklogDTO, error) {
	if date == "" {
		entry, err := a.worklog.Add(nodeID, summary, details, minutes, approximate, billable)
		if err != nil {
			return nil, err
		}
		_ = a.sync.RecordOp(syncsvc.EntityWorklog, entry.ID, syncsvc.OpCreate, worklogPayload(entry))
		return entryToDTO(entry), nil
	}
	entry, err := a.worklog.AddWithDate(nodeID, summary, details, date, minutes, approximate, billable)
	if err != nil {
		return nil, err
	}
	_ = a.sync.RecordOp(syncsvc.EntityWorklog, entry.ID, syncsvc.OpCreate, worklogPayload(entry))
	return entryToDTO(entry), nil
}

// --- report bindings ---

func (a *App) ListWorklogReport(dateFrom, dateTo, nodeID string, includeChildren bool, billableFilter, approxFilter string) ([]worklog.ReportRow, error) {
	f := buildWorklogFilter(dateFrom, dateTo, nodeID, includeChildren, billableFilter, approxFilter)
	rows, err := a.worklog.ListReport(f)
	if err != nil {
		return nil, err
	}
	a.worklog.BuildReportPaths(rows)
	return rows, nil
}

func (a *App) WorklogReportSummary(dateFrom, dateTo, nodeID string, includeChildren bool, billableFilter, approxFilter string) (*worklog.ReportSummary, error) {
	f := buildWorklogFilter(dateFrom, dateTo, nodeID, includeChildren, billableFilter, approxFilter)
	return a.worklog.Summary(f)
}

func (a *App) ExportWorklogCSV(dateFrom, dateTo, nodeID string, includeChildren bool, billableFilter, approxFilter string) (string, error) {
	f := buildWorklogFilter(dateFrom, dateTo, nodeID, includeChildren, billableFilter, approxFilter)
	return a.worklog.ExportCSV(f)
}

func (a *App) ExportWorklogMarkdown(dateFrom, dateTo, nodeID string, includeChildren bool, billableFilter, approxFilter string) (string, error) {
	f := buildWorklogFilter(dateFrom, dateTo, nodeID, includeChildren, billableFilter, approxFilter)
	return a.worklog.ExportMarkdown(f)
}

func (a *App) ExportWorklogPDF(dateFrom, dateTo, nodeID string, includeChildren bool, billableFilter, approxFilter string) ([]byte, error) {
	f := buildWorklogFilter(dateFrom, dateTo, nodeID, includeChildren, billableFilter, approxFilter)
	return a.worklog.ExportPDF(f)
}

func boolPtr(s string) *bool {
	switch s {
	case "yes":
		v := true
		return &v
	case "no":
		v := false
		return &v
	default:
		return nil
	}
}

func buildWorklogFilter(dateFrom, dateTo, nodeID string, includeChildren bool, billableFilter, approxFilter string) worklog.ReportFilter {
	return worklog.ReportFilter{
		DateFrom:        dateFrom,
		DateTo:          dateTo,
		NodeID:          nodeID,
		IncludeChildren: includeChildren,
		Billable:        boolPtr(billableFilter),
		Approximate:     boolPtr(approxFilter),
	}
}

// SaveWorklogReport generates a worklog report and opens a SaveFileDialog.
func (a *App) SaveWorklogReport(format, dateFrom, dateTo, nodeID string, includeChildren bool, billableFilter, approxFilter string) (string, error) {
	f := buildWorklogFilter(dateFrom, dateTo, nodeID, includeChildren, billableFilter, approxFilter)

	var data []byte
	var ext string
	switch format {
	case "csv":
		s, err := a.worklog.ExportCSV(f)
		if err != nil {
			return "", err
		}
		data = []byte(s)
		ext = ".csv"
	case "markdown":
		s, err := a.worklog.ExportMarkdown(f)
		if err != nil {
			return "", err
		}
		data = []byte(s)
		ext = ".md"
	case "pdf":
		var err error
		data, err = a.worklog.ExportPDF(f)
		if err != nil {
			return "", err
		}
		ext = ".pdf"
	default:
		return "", fmt.Errorf("unknown format: %s", format)
	}

	from := dateFrom
	if from == "" {
		from = "all"
	}
	to := dateTo
	if to == "" {
		to = "all"
	}
	defaultName := fmt.Sprintf("verstak-worklog-%s--%s%s", from, to, ext)

	path, err := wailsruntime.SaveFileDialog(a.ctx, wailsruntime.SaveDialogOptions{
		DefaultFilename: defaultName,
		Filters: []wailsruntime.FileFilter{
			{DisplayName: format, Pattern: "*" + ext},
		},
	})
	if err != nil {
		return "", err
	}
	if path == "" {
		return "", fmt.Errorf("отменено пользователем")
	}

	if err := os.WriteFile(path, data, 0o644); err != nil {
		return "", fmt.Errorf("не удалось сохранить файл: %w", err)
	}

	return fmt.Sprintf("Отчёт сохранён: %s", path), nil
}

// GetWorklogEntryEvents returns activity events linked to a worklog entry.
func (a *App) GetWorklogEntryEvents(entryID string) ([]EventDTO, error) {
	rows, err := a.db.Query(
		`SELECT e.id, e.node_id, e.event_type, e.target_type, e.target_id, e.target_path,
			e.title, COALESCE(e.metadata,''), e.created_at
		 FROM activity_events e
		 JOIN worklog_entry_events wle ON wle.event_id = e.id
		 WHERE wle.entry_id = ?
		 ORDER BY e.created_at ASC`, entryID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var out []EventDTO
	for rows.Next() {
		var d EventDTO
		if err := rows.Scan(&d.ID, &d.NodeID, &d.EventType, &d.TargetType,
			&d.TargetID, &d.TargetPath, &d.Title, &d.DetailsJSON, &d.CreatedAt); err != nil {
			return nil, err
		}
		out = append(out, d)
	}
	return out, rows.Err()
}

// --- helpers ---

func toWorklogDTOs(list []worklog.Entry) []WorklogDTO {
	result := make([]WorklogDTO, len(list))
	for i := range list {
		result[i] = *entryToDTO(&list[i])
	}
	return result
}

func entryToDTO(e *worklog.Entry) *WorklogDTO {
	mins := 0
	if e.Minutes != nil {
		mins = *e.Minutes
	}
	return &WorklogDTO{
		ID:          e.ID,
		NodeID:      e.NodeID,
		Summary:     e.Summary,
		Minutes:     mins,
		Date:        e.Date,
		Details:     e.Details,
		Approximate: e.Approximate,
		Billable:    e.Billable,
		Source:      e.Source,
		CreatedAt:   e.CreatedAt.Format("2006-01-02T15:04:05Z"),
	}
}