package image

import (
	"fmt"
	"image"
	"image/color"
	"image/png"
	"os"
	"path/filepath"
	"time"

	"github.com/golang/freetype"
	"github.com/golang/freetype/truetype"

	"douyu_go/internal/constants"
	"douyu_go/internal/logger"
	"douyu_go/internal/types"
	"douyu_go/internal/utils"
)

// SaveSuccessImage 保存成功兑换结果图片。
func SaveSuccessImage(account types.Account, product types.Product, roleName string, font *truetype.Font, successDir string) {
	if font == nil {
		return
	}

	productName := product.CommodityName
	if productName == "" {
		productName = product.CommodityID
	}

	width, height := 600, 280
	img := image.NewRGBA(image.Rect(0, 0, width, height))
	bgColor := color.RGBA{213, 239, 253, 255}
	topColor := color.RGBA{76, 175, 80, 255}
	white := color.RGBA{255, 255, 255, 255}
	black := color.RGBA{0, 0, 0, 255}

	for x := 0; x < width; x++ {
		for y := 0; y < height; y++ {
			if y < 60 {
				img.Set(x, y, topColor)
			} else {
				img.Set(x, y, bgColor)
			}
		}
	}

	ctx := freetype.NewContext()
	ctx.SetDPI(72)
	ctx.SetFont(font)
	ctx.SetClip(img.Bounds())
	ctx.SetDst(img)

	lines := []struct {
		Text  string
		Size  float64
		X, Y  int
		Color color.Color
	}{
		{productName, 20, 25, 42, white},
		{"兑换时间：" + time.Now().In(constants.CST).Format("2006年01月02日 15:04:05"), 16, 25, 110, black},
		{"游戏昵称：" + utils.EmptyDefault(roleName, "未知"), 16, 25, 150, black},
		{"兑换账号：" + account.Name, 16, 25, 190, black},
	}
	for _, line := range lines {
		ctx.SetFontSize(line.Size)
		ctx.SetSrc(image.NewUniform(line.Color))
		_, _ = ctx.DrawString(line.Text, freetype.Pt(line.X, line.Y))
	}

	name := utils.SafeFilename(fmt.Sprintf("%s_%s_%d.png", account.Name, productName, time.Now().Unix()))
	path := filepath.Join(successDir, name)
	file, err := os.Create(path)
	if err != nil {
		logger.LogEvent("图片", "error", "成功图片创建失败: %v", err)
		return
	}
	defer file.Close()
	if err := png.Encode(file, img); err != nil {
		logger.LogEvent("图片", "error", "成功图片保存失败: %v", err)
		return
	}
	logger.LogEvent("图片", "success", "成功图片已保存: %s", path)
}