// Package officeconvertclient provides typed Connect RPC helpers for conversions.
package officeconvertclient

import (
	"context"
	"errors"
	"net/http"
	"time"

	"connectrpc.com/connect"
	officeconvertapiv1 "gitea.auvem.com/end-internal/officeconvert/gen/go/officeconvertapi/v1"
	"gitea.auvem.com/end-internal/officeconvert/gen/go/officeconvertapi/v1/officeconvertapiv1connect"
	"github.com/segmentio/ksuid"
)

const defaultPollInterval = 2 * time.Second

// RasterTierOptions defines per-tier raster settings for conversion output.
type RasterTierOptions struct {
	Resolution  officeconvertapiv1.ConversionResolution
	JPEGQuality int32
}

// HtmlFormattingPolicy configures which formatting features are ignored in HTML notes mode.
type HtmlFormattingPolicy struct {
	IgnoreBold          bool
	IgnoreItalic        bool
	IgnoreUnderline     bool
	IgnoreStrikethrough bool
	IgnoreFontSize      bool
	IgnoreColor         bool
}

// NotesOptions controls speaker-notes extraction/output.
type NotesOptions struct {
	Format               officeconvertapiv1.NotesFormat
	HTMLUseParagraphTags *bool
	HTMLPolicy           *HtmlFormattingPolicy
}

// CreateConversionOptions configures optional full and thumbnail raster tiers.
type CreateConversionOptions struct {
	Full      *RasterTierOptions
	Thumbnail *RasterTierOptions
	Notes     *NotesOptions
}

// Client wraps the generated Connect client with orchestration-focused helpers.
type Client struct {
	rpc          officeconvertapiv1connect.ConversionServiceClient
	httpClient   *http.Client
	baseURL      string
	pollInterval time.Duration
}

// NewClient creates a new typed Officeconvert client.
func NewClient(baseURL string, httpClient *http.Client, options ...connect.ClientOption) *Client {
	if httpClient == nil {
		httpClient = http.DefaultClient
	}
	return &Client{
		rpc:          officeconvertapiv1connect.NewConversionServiceClient(httpClient, baseURL, options...),
		httpClient:   httpClient,
		baseURL:      baseURL,
		pollInterval: defaultPollInterval,
	}
}

// SetPollInterval configures the polling cadence used by WaitForCompletion.
func (c *Client) SetPollInterval(interval time.Duration) {
	if interval > 0 {
		c.pollInterval = interval
	}
}

// CreateConversion starts a conversion session and returns upload metadata.
func (c *Client) CreateConversion(
	ctx context.Context,
	sourceFilename string,
	options *CreateConversionOptions,
) (*CreateConversionResponse, error) {
	message := &officeconvertapiv1.CreateConversionRequest{
		SourceFilename: sourceFilename,
	}
	if options != nil {
		message.Full = toProtoSlideRasterOptions(options.Full)
		message.Thumbnail = toProtoSlideRasterOptions(options.Thumbnail)
		message.Notes = toProtoNotesOptions(options.Notes)
	}
	req := connect.NewRequest(message)
	res, err := c.rpc.CreateConversion(ctx, req)
	if err != nil {
		return nil, err
	}
	return augmentCreateConversionResponse(res.Msg)
}

func toProtoSlideRasterOptions(
	options *RasterTierOptions,
) *officeconvertapiv1.SlideRasterOptions {
	if options == nil {
		return nil
	}
	proto := &officeconvertapiv1.SlideRasterOptions{
		Resolution: options.Resolution,
	}
	if options.JPEGQuality != 0 {
		proto.Format = &officeconvertapiv1.SlideRasterOptions_Jpeg{
			Jpeg: &officeconvertapiv1.JpegOutputOptions{
				Quality: options.JPEGQuality,
			},
		}
	}
	return proto
}

func toProtoNotesOptions(options *NotesOptions) *officeconvertapiv1.NotesOptions {
	if options == nil {
		return nil
	}
	proto := &officeconvertapiv1.NotesOptions{
		Format: options.Format,
	}
	if options.HTMLUseParagraphTags != nil {
		proto.HtmlUseParagraphTags = options.HTMLUseParagraphTags
	}
	if options.HTMLPolicy != nil {
		proto.HtmlPolicy = &officeconvertapiv1.HtmlFormattingPolicy{
			IgnoreBold:          options.HTMLPolicy.IgnoreBold,
			IgnoreItalic:        options.HTMLPolicy.IgnoreItalic,
			IgnoreUnderline:     options.HTMLPolicy.IgnoreUnderline,
			IgnoreStrikethrough: options.HTMLPolicy.IgnoreStrikethrough,
			IgnoreFontSize:      options.HTMLPolicy.IgnoreFontSize,
			IgnoreColor:         options.HTMLPolicy.IgnoreColor,
		}
	}
	return proto
}

// StartConversion signals that upload is complete and conversion can begin.
func (c *Client) StartConversion(
	ctx context.Context,
	id ksuid.KSUID,
) (*StartConversionResponse, error) {
	req := connect.NewRequest(&officeconvertapiv1.StartConversionRequest{
		ConversionId: id.String(),
	})
	res, err := c.rpc.StartConversion(ctx, req)
	if err != nil {
		return nil, err
	}
	return augmentStartConversionResponse(res.Msg)
}

// GetConversionStatus returns the latest status for a conversion session.
func (c *Client) GetConversionStatus(
	ctx context.Context,
	id ksuid.KSUID,
) (*GetConversionStatusResponse, error) {
	req := connect.NewRequest(&officeconvertapiv1.GetConversionStatusRequest{
		ConversionId: id.String(),
	})
	res, err := c.rpc.GetConversionStatus(ctx, req)
	if err != nil {
		return nil, err
	}
	return augmentGetConversionStatusResponse(res.Msg)
}

// GetSlideDeck retrieves the final converted deck response.
func (c *Client) GetSlideDeck(
	ctx context.Context,
	id ksuid.KSUID,
) (*officeconvertapiv1.GetSlideDeckResponse, error) {
	req := connect.NewRequest(&officeconvertapiv1.GetSlideDeckRequest{
		ConversionId: id.String(),
	})
	res, err := c.rpc.GetSlideDeck(ctx, req)
	if err != nil {
		return nil, err
	}
	return res.Msg, nil
}

// DeleteConversion triggers immediate resource cleanup for a session.
func (c *Client) DeleteConversion(
	ctx context.Context,
	id ksuid.KSUID,
) (*DeleteConversionResponse, error) {
	req := connect.NewRequest(&officeconvertapiv1.DeleteConversionRequest{
		ConversionId: id.String(),
	})
	res, err := c.rpc.DeleteConversion(ctx, req)
	if err != nil {
		return nil, err
	}
	return augmentDeleteConversionResponse(res.Msg)
}

// WaitForCompletion polls status until terminal completion or context cancellation.
func (c *Client) WaitForCompletion(
	ctx context.Context,
	id ksuid.KSUID,
) (*GetConversionStatusResponse, error) {
	ticker := time.NewTicker(c.pollInterval)
	defer ticker.Stop()

	for {
		status, err := c.GetConversionStatus(ctx, id)
		if err != nil {
			return nil, err
		}

		switch status.Status {
		case officeconvertapiv1.ConversionStatus_CONVERSION_STATUS_SUCCEEDED:
			return status, nil
		case officeconvertapiv1.ConversionStatus_CONVERSION_STATUS_FAILED:
			return nil, errors.New(status.ErrorMessage)
		}

		select {
		case <-ctx.Done():
			return nil, ctx.Err()
		case <-ticker.C:
		}
	}
}