// Package webui 渲染采购服务当前可用的服务端页面。
package webui

import (
	"embed"
	"fmt"
	"html/template"
	"io"
	"time"

	"cmbuyer/admin/internal/taskdetail"
	"cmbuyer/admin/internal/tasks"
)

//go:embed templates/*.html
var templateFiles embed.FS

//go:embed static/tasks.js
var tasksScript []byte

var shanghaiLocation = time.FixedZone("Asia/Shanghai", 8*60*60)

var templates = template.Must(template.New("webui").Funcs(template.FuncMap{
	"list":                     func(values ...any) []any { return values },
	"statusLabel":              statusLabel,
	"shanghaiDateTime":         func(value time.Time) string { return value.In(shanghaiLocation).Format(time.RFC3339) },
	"shanghaiTime":             func(value time.Time) string { return value.In(shanghaiLocation).Format("2006-01-02 15:04") },
	"canonicalURL":             tasks.CanonicalURL,
	"formatBytes":              formatBytes,
	"taskSafetyTitle":          taskSafetyTitle,
	"taskSafetyText":           taskSafetyText,
	"authorizationStatusLabel": authorizationStatusLabel,
	"attemptStatusLabel":       attemptStatusLabel,
	"submissionStatusLabel":    submissionStatusLabel,
	"evidenceKindLabel":        evidenceKindLabel,
}).ParseFS(templateFiles, "templates/*.html"))

// LoginData 是登录页面所需的非敏感展示数据。
type LoginData struct {
	CSRFToken string
	ReturnTo  string
	Username  string
	Error     string
}

// TasksData 是受保护的建单与任务工作台页面所需数据。
type TasksData struct {
	CSRFToken    string
	Tasks        []tasks.TaskRow
	Filter       tasks.TaskFilter
	FilterErrors tasks.Errors
	HasFilter    bool
	StartKey     string
	Form         tasks.Form
	Errors       tasks.Errors
	OpenForm     bool
	FullPage     bool
	FocusField   string
	Success      bool
}

type TaskDetailData struct{ Detail taskdetail.Detail }

// RenderLogin 写入登录页。
func RenderLogin(writer io.Writer, data LoginData) error {
	return templates.ExecuteTemplate(writer, "login.html", data)
}

// RenderTasks 写入登录后的受保护任务页。
func RenderTasks(writer io.Writer, data TasksData) error {
	return templates.ExecuteTemplate(writer, "tasks.html", data)
}

func RenderTaskDetailPage(writer io.Writer, data TaskDetailData) error {
	return templates.ExecuteTemplate(writer, "task-detail-page.html", data)
}

func RenderTaskDetailFragment(writer io.Writer, data TaskDetailData) error {
	return templates.ExecuteTemplate(writer, "task-detail-content", data)
}

func TasksScript() []byte { return tasksScript }

func statusLabel(status string) string {
	labels := map[string]string{
		"DRAFT":                   "待开始",
		"PENDING":                 "已授权待领取",
		"CLAIMED":                 "已领取",
		"ORDERING":                "执行中",
		"NEEDS_MANUAL":            "待人工处理",
		"WAITING_PAYMENT":         "待付款",
		"RECONCILIATION_REQUIRED": "围栏后待调和",
		"SUCCEEDED":               "已完成",
		"FAILED":                  "失败",
		"CANCELED":                "已取消",
	}
	if label, ok := labels[status]; ok {
		return label
	}
	return "未知状态"
}

func taskSafetyTitle(status string) string {
	if status == "WAITING_PAYMENT" {
		return "订单已创建，系统尚未付款。"
	}
	if status == "RECONCILIATION_REQUIRED" {
		return "订单可能已创建，只能调和同一提交。"
	}
	return "系统只创建待付款订单，不会自动付款。"
}

func taskSafetyText(status string) string {
	if status == "DRAFT" {
		return "创建任务不构成授权；请回到列表勾选后开始采购。"
	}
	if status == "RECONCILIATION_REQUIRED" {
		return "围栏保持占用，禁止重新授权、再次提交或释放。"
	}
	return "截图只供内部审计，不替代实时价格闸门，也不会触发设备动作。"
}

func authorizationStatusLabel(status string) string {
	labels := map[string]string{"ACTIVE": "授权有效", "CLAIMED": "已被领取", "FENCED": "提交围栏已建立", "CONSUMED": "授权已消费", "EXPIRED": "授权已过期", "ABANDONED": "授权已关闭"}
	if value, ok := labels[status]; ok {
		return value
	}
	return "未知授权状态"
}

func attemptStatusLabel(status string) string {
	labels := map[string]string{"CLAIMED": "已领取", "ORDERING": "执行中", "FAILED": "围栏前失败", "FENCED": "已建立围栏", "ABANDONED": "已安全停止"}
	if value, ok := labels[status]; ok {
		return value
	}
	return "未知执行状态"
}

func submissionStatusLabel(status string) string {
	labels := map[string]string{"FENCED": "围栏已建立", "SUBMITTED": "已创建待付款订单", "RECONCILIATION_REQUIRED": "结果待调和", "MANUAL_RESOLVED": "已人工调和"}
	if value, ok := labels[status]; ok {
		return value
	}
	return "未知提交状态"
}

func evidenceKindLabel(kind string) string {
	if kind == "SKU_PANEL_GATE_1" {
		return "规格面板 · 闸门一"
	}
	return "内部截图"
}

func formatBytes(value int64) string {
	if value >= 1<<20 {
		return fmt.Sprintf("%.1f MiB", float64(value)/(1<<20))
	}
	if value >= 1<<10 {
		return fmt.Sprintf("%.1f KiB", float64(value)/(1<<10))
	}
	return fmt.Sprintf("%d B", value)
}