import type { UseMutationResult, UseQueryResult } from "@tanstack/react-query";
import type { CursorPage } from "@umt/contracts";
import { LoaderCircle, Pencil, Plus, Trash2 } from "lucide-react";
import { type ReactNode, useState } from "react";
import { toast } from "sonner";
import type { z } from "zod";
import { ConfirmDialog } from "~/components/console/confirm-dialog.tsx";
import { type DataColumn, DataTable } from "~/components/console/data-table.tsx";
import { DetailSheet } from "~/components/console/detail-sheet.tsx";
import { FormField, zodFieldErrors } from "~/components/console/form-field.tsx";
import { useRecordSheet } from "~/components/console/record-sheet.tsx";
import { SecretInput } from "~/components/console/secret-input.tsx";
import { UnitInput } from "~/components/console/unit-input.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Input } from "~/components/ui/input.tsx";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "~/components/ui/select.tsx";
import { Switch } from "~/components/ui/switch.tsx";
import { Textarea } from "~/components/ui/textarea.tsx";
import { errorMessage } from "~/lib/api.ts";
import { revealFirstError } from "~/lib/form-errors.ts";
import { secretHint } from "~/lib/secret.ts";
import { type TokenRange, tokenInputError, tokenRangeText } from "~/lib/tokens.ts";
import { cn } from "~/lib/utils.ts";

// 设置页里"实例类"资源的通用段落:列表 + 新建/编辑抽屉 + 删除 + 行内动作。
// 表单用 contracts 的 Create/Update schema 做 zod 校验;凭证字段只写(kind=secret,值约定见 ~/lib/secret.ts):
// 留空不变、SECRET_CLEAR 清除;token 数字段(kind=tokens)以 K 输入,toBody 里用 kToTokens 换回原始值。

export type FieldValue = string | boolean;
export type FormValues = Record<string, FieldValue>;

export type FieldSpec = {
  name: string;
  label: string;
  kind: "text" | "url" | "password" | "number" | "select" | "switch" | "textarea" | "tokens" | "secret";
  options?: { value: string; label: string }[];
  placeholder?: string;
  hint?: string;
  /** 编辑时的说明(如"留空表示不修改") */
  editHint?: string;
  required?: boolean;
  /** 编辑时不可改 */
  createOnly?: boolean;
  /** 条件显示 */
  visible?: (v: FormValues) => boolean;
  wide?: boolean;
  /** kind=tokens:以 K 为单位输入(表单值是 K 字符串),范围按原始 token 数 */
  tokens?: TokenRange;
  /** kind=secret:只写凭证。set/mask 从表单值(fromRow / fromSettings 放进去的隐藏键)或闭包取 */
  secret?: {
    set: (v: FormValues) => boolean;
    mask?: (v: FormValues) => string | null | undefined;
    clearable?: boolean;
    multiline?: boolean;
  };
};

/** kind=tokens 字段先在本地校验(错误用 K 表述),通过后再走 zod */
export function localFieldErrors(fields: FieldSpec[], values: FormValues): Record<string, string> {
  const out: Record<string, string> = {};
  for (const f of fields) {
    if (f.visible && !f.visible(values)) continue;
    if (f.kind === "tokens") {
      const e = tokenInputError(str(values[f.name]), { ...f.tokens, required: f.tokens?.required ?? f.required });
      if (e) out[f.name] = e;
    }
  }
  return out;
}

/** 字段说明:凭证字段已设置时补"留空不修改",token 字段缺省给范围 */
export function fieldHint(spec: FieldSpec, value: FieldValue | undefined, values: FormValues, hint?: string) {
  if (spec.kind === "secret") return secretHint(hint, value, spec.secret?.set(values) ?? false);
  if (spec.kind === "tokens" && hint === undefined && spec.tokens) return tokenRangeText(spec.tokens) ?? undefined;
  return hint;
}

export type ResourceConfig<Row extends { id: string }> = {
  /** 单数名,用于标题与提示:"下载器实例" */
  noun: string;
  description?: ReactNode;
  columns: DataColumn<Row>[];
  fields: FieldSpec[];
  /** 新建时的初始值 */
  initial: FormValues;
  /** 编辑时从行取表单值(凭证字段给空串) */
  fromRow: (row: Row) => FormValues;
  /** 表单值 → 请求体;mode=edit 时凭证空串应省略 */
  toBody: (v: FormValues, mode: "create" | "edit") => unknown;
  createSchema: z.ZodType;
  updateSchema: z.ZodType;
  /** 行内额外动作(测试连接等) */
  rowActions?: (row: Row) => ReactNode;
  emptyHint?: string;
  /** 删除确认的额外说明 */
  deleteHint?: string;
  /** 编辑抽屉里表单下方的附加内容(如该实例的路径映射) */
  drawerExtra?: (row: Row) => ReactNode;
};

type Hooks<Row> = {
  list: UseQueryResult<CursorPage<Row>>;
  create: UseMutationResult<Row, Error, never>;
  update: UseMutationResult<Row, Error, { id: string; body: never }>;
  remove: UseMutationResult<unknown, Error, string>;
};

export function ResourceSection<Row extends { id: string }>({
  config,
  hooks,
}: {
  config: ResourceConfig<Row>;
  hooks: Hooks<Row>;
}) {
  const [deleting, setDeleting] = useState<Row | null>(null);
  const { list, remove } = hooks;
  // 记录抽屉(console-ia.md §9):编辑哪一个写在 ?open=<id>(同页几个列表各认自己的 id);新建只在本页状态里
  const sheet = useRecordSheet();
  const [creating, setCreating] = useState(false);
  const found = sheet.id ? (list.data?.items.find((r) => r.id === sheet.id) ?? null) : null;
  const editing: Row | "new" | null = creating ? "new" : found;
  const setEditing = (row: Row | "new") => (row === "new" ? setCreating(true) : sheet.open(row.id));

  const columns: DataColumn<Row>[] = [
    ...config.columns,
    {
      key: "__actions",
      header: <span className="sr-only">操作</span>,
      align: "right",
      cell: (row) => (
        // biome-ignore lint/a11y/noStaticElementInteractions: 只拦截冒泡,避免行内按钮触发整行打开抽屉
        <div
          className="flex items-center justify-end gap-1"
          onClick={(e) => e.stopPropagation()}
          onKeyDown={(e) => e.stopPropagation()}
        >
          {config.rowActions?.(row)}
          <Button variant="ghost" size="icon-sm" aria-label={`编辑${config.noun}`} onClick={() => setEditing(row)}>
            <Pencil />
          </Button>
          <Button
            variant="ghost"
            size="icon-sm"
            aria-label={`删除${config.noun}`}
            className="hover:text-destructive"
            onClick={() => setDeleting(row)}
          >
            <Trash2 />
          </Button>
        </div>
      ),
    },
  ];

  return (
    <div>
      <div className="mb-3 flex flex-wrap items-start justify-between gap-3">
        {config.description ? (
          <p className="max-w-2xl text-caption text-muted-foreground">{config.description}</p>
        ) : (
          <span />
        )}
        <Button size="sm" className="ml-auto" onClick={() => setEditing("new")}>
          <Plus />
          添加{config.noun}
        </Button>
      </div>
      <DataTable
        columns={columns}
        rows={list.data?.items}
        rowKey={(r) => r.id}
        loading={list.isPending}
        error={list.error}
        onRetry={() => list.refetch()}
        onRowClick={(r) => setEditing(r)}
        empty={{ title: `还没有${config.noun}`, description: config.emptyHint }}
      />
      <ResourceFormDrawer
        key={editing === "new" ? "new" : (editing?.id ?? "none")}
        config={config}
        hooks={hooks}
        row={editing}
        onClose={() => (creating ? setCreating(false) : sheet.close())}
      />
      <ConfirmDialog
        open={!!deleting}
        onOpenChange={(o) => !o && setDeleting(null)}
        title={`删除${config.noun}？`}
        description={config.deleteHint ?? "删除后无法恢复。"}
        confirmLabel={`删除${config.noun}`}
        destructive
        onConfirm={async () => {
          if (!deleting) return;
          try {
            await remove.mutateAsync(deleting.id);
            toast.success(`已删除${config.noun}`);
          } catch (err) {
            toast.error(errorMessage(err, "删除失败"));
            throw err;
          }
        }}
      />
    </div>
  );
}

function ResourceFormDrawer<Row extends { id: string }>({
  config,
  hooks,
  row,
  onClose,
}: {
  config: ResourceConfig<Row>;
  hooks: Hooks<Row>;
  row: Row | "new" | null;
  onClose: () => void;
}) {
  const mode = row === "new" ? "create" : "edit";
  const [values, setValues] = useState<FormValues>(() =>
    row && row !== "new" ? config.fromRow(row) : { ...config.initial },
  );
  const [errors, setErrors] = useState<Record<string, string>>({});
  const pending = hooks.create.isPending || hooks.update.isPending;

  const set = (name: string, v: FieldValue) => setValues((s) => ({ ...s, [name]: v }));

  const submit = async (e: React.FormEvent) => {
    e.preventDefault();
    const local = localFieldErrors(config.fields, values);
    if (Object.keys(local).length) {
      setErrors(local);
      revealFirstError();
      return;
    }
    const body = config.toBody(values, mode);
    const parsed = (mode === "create" ? config.createSchema : config.updateSchema).safeParse(body);
    if (!parsed.success) {
      const fe = zodFieldErrors(parsed.error.issues);
      // 顶层 refine 错误(path 为空)挂到第一个字段下
      if (fe[""]) {
        fe[config.fields[0]?.name ?? ""] ??= fe[""];
      }
      setErrors(fe);
      revealFirstError();
      return;
    }
    setErrors({});
    try {
      if (mode === "create") await hooks.create.mutateAsync(parsed.data as never);
      else if (row && row !== "new") await hooks.update.mutateAsync({ id: row.id, body: parsed.data as never });
      toast.success(mode === "create" ? `已添加${config.noun}` : `已保存${config.noun}`);
      onClose();
    } catch (err) {
      toast.error(errorMessage(err, "保存失败"));
    }
  };

  const formId = `resource-form-${config.noun}`;
  return (
    <DetailSheet
      open={!!row}
      onOpenChange={(o) => !o && !pending && onClose()}
      title={`${mode === "create" ? "添加" : "编辑"}${config.noun}`}
      description="凭证只写入，保存后不回显。"
      footer={
        <>
          <Button variant="outline" onClick={onClose} disabled={pending}>
            取消
          </Button>
          <Button type="submit" form={formId} disabled={pending}>
            {pending ? <LoaderCircle className="animate-spin" /> : null}
            保存
          </Button>
        </>
      }
    >
      <form id={formId} onSubmit={submit} noValidate className="grid gap-x-4 gap-y-1 sm:grid-cols-2">
        {config.fields
          .filter((f) => !f.visible || f.visible(values))
          .map((f) => (
            <FieldControl
              key={f.name}
              spec={f}
              value={values[f.name]}
              error={errors[f.name]}
              onChange={(v) => set(f.name, v)}
              disabled={pending || (mode === "edit" && !!f.createOnly)}
              hint={mode === "edit" && f.editHint ? f.editHint : f.hint}
              values={values}
            />
          ))}
      </form>
      {row && row !== "new" && config.drawerExtra ? config.drawerExtra(row) : null}
    </DetailSheet>
  );
}

export function FieldControl({
  spec,
  value,
  error,
  onChange,
  disabled,
  hint,
  values,
}: {
  spec: FieldSpec;
  value: FieldValue | undefined;
  error?: string;
  onChange: (v: FieldValue) => void;
  disabled?: boolean;
  hint?: string;
  /** 整个表单的值(凭证字段据此判断是否已设置);单独使用时可省略 */
  values?: FormValues;
}) {
  const id = `f-${spec.name}`;
  const all = values ?? {};
  const wide = spec.wide || spec.kind === "textarea";
  if (spec.kind === "switch") {
    return (
      <div className={wide ? "sm:col-span-2" : undefined}>
        <label htmlFor={id} className="flex min-h-9 items-center justify-between gap-3 text-caption font-medium">
          {spec.label}
          <Switch id={id} checked={value === true} onCheckedChange={onChange} disabled={disabled} />
        </label>
        <p className="min-h-4 text-meta text-muted-foreground">{hint ?? ""}</p>
      </div>
    );
  }
  return (
    <FormField
      label={spec.label}
      htmlFor={id}
      error={error}
      hint={fieldHint(spec, value, all, hint)}
      required={spec.required}
      className={wide ? "sm:col-span-2" : undefined}
    >
      <FieldInput
        id={id}
        spec={spec}
        value={value}
        values={all}
        error={error}
        onChange={onChange}
        disabled={disabled}
      />
    </FormField>
  );
}

/** 字段的控件本体(不含标签与说明);开关也在这里 */
export function FieldInput({
  id,
  spec,
  value,
  error,
  onChange,
  disabled,
  className,
  values,
}: {
  id: string;
  spec: FieldSpec;
  value: FieldValue | undefined;
  error?: string;
  onChange: (v: FieldValue) => void;
  disabled?: boolean;
  className?: string;
  values?: FormValues;
}) {
  if (spec.kind === "secret") {
    const all = values ?? {};
    return (
      <SecretInput
        id={id}
        value={typeof value === "string" ? value : ""}
        onChange={onChange}
        isSet={spec.secret?.set(all) ?? false}
        mask={spec.secret?.mask?.(all)}
        clearable={spec.secret?.clearable}
        multiline={spec.secret?.multiline}
        label={spec.label}
        placeholder={spec.placeholder}
        disabled={disabled}
        invalid={!!error}
        className={className}
      />
    );
  }
  if (spec.kind === "tokens") {
    return (
      <UnitInput
        id={id}
        unit="K"
        value={String(value ?? "")}
        onChange={(e) => onChange(e.target.value)}
        placeholder={spec.placeholder}
        disabled={disabled}
        aria-invalid={!!error}
        className={className}
      />
    );
  }
  if (spec.kind === "switch") {
    return (
      <Switch
        id={id}
        checked={value === true}
        onCheckedChange={onChange}
        disabled={disabled}
        className={className}
        aria-invalid={!!error}
      />
    );
  }
  if (spec.kind === "select") {
    return (
      <Select value={String(value ?? "")} onValueChange={onChange} disabled={disabled}>
        <SelectTrigger id={id} className={cn("w-full", className)} aria-invalid={!!error}>
          <SelectValue placeholder={spec.placeholder ?? "选择"} />
        </SelectTrigger>
        <SelectContent position="popper">
          {(spec.options ?? []).map((o) => (
            <SelectItem key={o.value} value={o.value}>
              {o.label}
            </SelectItem>
          ))}
        </SelectContent>
      </Select>
    );
  }
  if (spec.kind === "textarea") {
    return (
      <Textarea
        id={id}
        value={String(value ?? "")}
        onChange={(e) => onChange(e.target.value)}
        placeholder={spec.placeholder}
        disabled={disabled}
        aria-invalid={!!error}
        rows={3}
        className={className}
      />
    );
  }
  return (
    <Input
      id={id}
      type={
        spec.kind === "password" ? "password" : spec.kind === "number" ? "number" : spec.kind === "url" ? "url" : "text"
      }
      inputMode={spec.kind === "number" ? "decimal" : undefined}
      autoComplete={spec.kind === "password" ? "new-password" : "off"}
      value={String(value ?? "")}
      onChange={(e) => onChange(e.target.value)}
      placeholder={spec.placeholder}
      disabled={disabled}
      aria-invalid={!!error}
      className={className}
    />
  );
}

/** 表单值工具 */
export const str = (v: FieldValue | undefined) => (typeof v === "string" ? v.trim() : "");
export const optStr = (v: FieldValue | undefined) => str(v) || undefined;
export const nullStr = (v: FieldValue | undefined) => str(v) || null;
export const num = (v: FieldValue | undefined) => (str(v) === "" ? undefined : Number(str(v)));