"use client";

import { useId, useState } from "react";
import { BirthDatePicker } from "@/components/birth-date-picker";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { birthTimeConsultationOptionsCopy } from "@/lib/birth-time-consultation-consent";
import {
  birthTimeDisplayState,
  birthTimePeriodOptions,
  birthTimeSourceDefaults,
  birthTimeSourceOptions,
  type BirthTimeDraft,
  type BirthTimeDraftPatch,
} from "@/lib/birth-time-intake-model";

type BirthTimeIntakeProps = {
  readonly value: BirthTimeDraft;
  readonly onPatch: (patch: BirthTimeDraftPatch) => void;
};


const hours = Array.from({ length: 24 }, (_, index) => String(index).padStart(2, "0"));
const minutes = Array.from({ length: 60 }, (_, index) => String(index).padStart(2, "0"));

function splitBirthTime(value: string) {
  const [hour = "", minute = ""] = value.split(":");
  return { hour, minute };
}

type BirthClockSelectProps = {
  readonly value: string;
  readonly onChange: (value: string) => void;
};

function BirthClockSelect({ value, onChange }: BirthClockSelectProps) {
  const currentTime = value || "";
  const [timeParts, setTimeParts] = useState(() => splitBirthTime(currentTime));

  const patchTime = (part: "hour" | "minute", nextValue: string | null) => {
    if (nextValue === null) return;
    const nextParts = { ...timeParts, [part]: nextValue };
    setTimeParts(nextParts);
    if (nextParts.hour && nextParts.minute) onChange(`${nextParts.hour}:${nextParts.minute}`);
  };

  return (
    <div className="birth-time-clock-selects" aria-label="选择出生时间">
      <Select required value={timeParts.hour || null} onValueChange={(nextValue) => patchTime("hour", nextValue)}>
        <SelectTrigger aria-label="出生时间小时">
          <SelectValue placeholder="时" />
        </SelectTrigger>
        <SelectContent className="birth-time-clock-menu" style={{ width: 108, minWidth: 108 }}>
          {hours.map((hour) => <SelectItem key={hour} value={hour}>{hour}</SelectItem>)}
        </SelectContent>
      </Select>
      <span className="birth-time-clock-separator" aria-hidden="true">:</span>
      <Select required value={timeParts.minute || null} onValueChange={(nextValue) => patchTime("minute", nextValue)}>
        <SelectTrigger aria-label="出生时间分钟">
          <SelectValue placeholder="分" />
        </SelectTrigger>
        <SelectContent className="birth-time-clock-menu" style={{ width: 108, minWidth: 108 }}>
          {minutes.map((minute) => <SelectItem key={minute} value={minute}>{minute}</SelectItem>)}
        </SelectContent>
      </Select>
    </div>
  );
}

export function BirthTimeIntakeFields({ value, onPatch }: BirthTimeIntakeProps) {
  const groupId = useId();
  const source = value.birthTimeSource;
  const isConfirmed = value.birthTimeStatus === "confirmed";
  const displayState = birthTimeDisplayState(value);
  const knowledgeMode = source === "period_only" || source === "unknown"
    ? "uncertain"
    : source ? "exact" : "";
  const usesClockTime = source === "hospital_record"
    || source === "family_exact"
    || source === "approximate"
    || source === "legacy_import";

  return (
    <div className="birth-time-intake">
      {displayState && (
        <section className="birth-time-profile-result" aria-label="生时校正结果">
          <div className="birth-time-profile-result-heading">
            <span>出生时间记录</span>
            <strong>{displayState.kind === "candidate" ? "候选时间" : displayState.kind === "accepted" ? "校正采用" : "引擎确认"}</strong>
          </div>
          <dl>
            <div>
              <dt>{displayState.kind === "candidate" ? "待验证候选" : "当前排盘时间"}</dt>
              <dd>{displayState.activeTime}</dd>
            </div>
            <div>
              <dt>原始填报时间</dt>
              <dd>{displayState.reportedLabel}</dd>
            </div>
          </dl>
          {displayState.kind === "candidate" && (
            <p>这仍是未确认候选，不会自动成为出生分钟；{birthTimeConsultationOptionsCopy(value)}</p>
          )}
          {displayState.kind === "accepted" && (
            <p>这是你从候选中选择的校正采用时间，并非引擎唯一确认分钟；后续排盘会使用它。</p>
          )}
        </section>
      )}
      <BirthDatePicker
        value={value.date}
        disabled={isConfirmed}
        onChange={(date) => onPatch({ date })}
      />

      {source === "legacy_import" && (
        <p className="birth-time-legacy-note">
          这是账号里已有的确认时间。本阶段保留原始记录，不在资料表内直接覆盖。
        </p>
      )}

      {!isConfirmed && <fieldset className="birth-time-source-fieldset">
        <legend>你对出生时间了解多少？</legend>
        <p className="birth-time-source-intro">不用猜具体分钟，先选一个最符合你的情况的选项。</p>
        <div className="birth-time-source-list">
          {birthTimeSourceOptions.map((option) => (
            <label
              className={`birth-time-source-option ${option.value === "family_exact"
                ? knowledgeMode === "exact" ? "is-selected" : ""
                : knowledgeMode === "uncertain" ? "is-selected" : ""}`}
              key={option.value}
            >
              <input
                checked={option.value === "family_exact"
                  ? knowledgeMode === "exact"
                  : knowledgeMode === "uncertain"}
                name={`birth-time-source-${groupId}`}
                type="radio"
                value={option.value}
                onChange={() => onPatch({
                  birthTimeSource: option.value,
                  birthTimeStatus: "reported",
                  time: "",
                  ...birthTimeSourceDefaults[option.value],
                })}
              />
              <span>
                <b>{option.label}</b>
                <small>{option.hint}</small>
              </span>
            </label>
          ))}
        </div>
      </fieldset>}

      {usesClockTime && (
        <div className="birth-time-detail-grid onboarding-card-reveal">
          <label>
            <span>{isConfirmed ? "当前排盘时间" : source === "approximate" ? "大概时间" : "记录时间"}</span>
            <BirthClockSelect
              key={`${source}-${value.reportedTime || value.time}`}
              value={value.reportedTime || value.time}
              onChange={(reportedTime) => onPatch({ reportedTime })}
            />
          </label>
          {source === "hospital_record" && (
            <p className="birth-time-detail-note">系统会无感检查前后 2 分钟的上升与 D9 / D10 稳定性。</p>
          )}
        </div>
      )}

      {source === "period_only" && (
        <div className="birth-time-detail-grid birth-time-period-details onboarding-card-reveal">
          <label>
            <span>请选择最接近的时间范围</span>
            <Select
              required
              value={value.birthTimePeriod || null}
              onValueChange={(nextValue) => {
                if (typeof nextValue === "string") onPatch({ birthTimePeriod: nextValue });
              }}
            >
              <SelectTrigger aria-label="最接近的时间范围">
                <SelectValue placeholder="请选择大致时段">
                  {(selectedValue) => birthTimePeriodOptions.find((option) => option.value === selectedValue)?.label ?? "请选择大致时段"}
                </SelectValue>
              </SelectTrigger>
              <SelectContent>
                {birthTimePeriodOptions.map((option) => (
                  <SelectItem key={option.value} value={option.value}>{option.label}</SelectItem>
                ))}
              </SelectContent>
            </Select>
          </label>
          <label>
            <span>补充描述（可选）</span>
            <textarea
              maxLength={240}
              placeholder="例如：天刚亮、午饭前后、家人记得大约 6—8 点"
              rows={2}
              value={value.birthTimeClue}
              onChange={(event) => onPatch({ birthTimeClue: event.target.value })}
            />
          </label>
          <button
            className="button-secondary birth-time-skip-button"
            type="button"
            onClick={() => onPatch({
              birthTimeSource: "unknown",
              reportedTime: "",
              birthTimePeriod: "",
              birthTimeClue: "",
              uncertaintyBeforeMinutes: null,
              uncertaintyAfterMinutes: null,
              birthTimeStatus: "reported",
              time: "",
            })}
          >完全不清楚，跳过出生时间</button>
        </div>
      )}

      {source === "unknown" && (
        <div className="birth-time-detail-note onboarding-card-reveal" role="status">
          <p>已跳过具体出生时间。保存后可以直接使用首页功能，生时校正以后需要时再做。</p>
          <button
            className="button-secondary"
            type="button"
            onClick={() => onPatch({ birthTimeSource: "period_only", birthTimeStatus: "reported" })}
          >我可以描述一个时间范围</button>
        </div>
      )}
    </div>
  );
}