import { useEffect, useMemo, useState } from 'react';

import { Button } from '@renderer/components/ui/button';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@renderer/components/ui/dialog';
import { Input } from '@renderer/components/ui/input';
import { Label } from '@renderer/components/ui/label';
import { MentionableTextarea } from '@renderer/components/ui/MentionableTextarea';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@renderer/components/ui/select';
import { Tooltip, TooltipContent, TooltipTrigger } from '@renderer/components/ui/tooltip';
import { getTeamColorSet } from '@renderer/constants/teamColors';
import { useDraftPersistence } from '@renderer/hooks/useDraftPersistence';
import { buildReplyBlock } from '@renderer/utils/agentMessageFormatting';
import { formatAgentRole } from '@renderer/utils/formatAgentRole';
import { buildMemberColorMap } from '@renderer/utils/memberHelpers';
import { X } from 'lucide-react';

import type { MentionSuggestion } from '@renderer/types/mention';
import type { ResolvedTeamMember, SendMessageResult } from '@shared/types';

interface QuotedMessage {
  from: string;
  text: string;
}

interface SendMessageDialogProps {
  open: boolean;
  members: ResolvedTeamMember[];
  defaultRecipient?: string;
  quotedMessage?: QuotedMessage;
  sending: boolean;
  sendError: string | null;
  lastResult: SendMessageResult | null;
  onSend: (member: string, text: string, summary?: string) => void;
  onClose: () => void;
}

const NO_MEMBER = '__none__';

export const SendMessageDialog = ({
  open,
  members,
  defaultRecipient,
  quotedMessage,
  sending,
  sendError,
  lastResult,
  onSend,
  onClose,
}: SendMessageDialogProps): React.JSX.Element => {
  const colorMap = useMemo(() => buildMemberColorMap(members), [members]);
  const [quote, setQuote] = useState<QuotedMessage | undefined>(undefined);
  const [member, setMember] = useState('');
  const textDraft = useDraftPersistence({ key: 'sendMessage:text' });
  const [summary, setSummary] = useState('');
  const [prevOpen, setPrevOpen] = useState(false);
  const [prevResult, setPrevResult] = useState<SendMessageResult | null>(null);

  // Reset form when dialog opens
  if (open && !prevOpen) {
    setMember(defaultRecipient ?? '');
    setSummary('');
    setQuote(quotedMessage);
    setPrevResult(lastResult);
  }
  if (open !== prevOpen) {
    setPrevOpen(open);
  }

  // Track whether auto-close is needed (setState in render phase is fine)
  const [pendingAutoClose, setPendingAutoClose] = useState(false);
  if (open && lastResult && lastResult !== prevResult) {
    setPrevResult(lastResult);
    setMember('');
    setSummary('');
    setPendingAutoClose(true);
  }

  // Side effects (onClose mutates parent state) must run in useEffect, not render phase
  useEffect(() => {
    if (pendingAutoClose) {
      textDraft.clearDraft();
      setPendingAutoClose(false);
      onClose();
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps -- only trigger on pendingAutoClose flag
  }, [pendingAutoClose]);

  const mentionSuggestions = useMemo<MentionSuggestion[]>(
    () =>
      members.map((m) => ({
        id: m.name,
        name: m.name,
        subtitle: formatAgentRole(m.role) ?? formatAgentRole(m.agentType) ?? undefined,
        color: colorMap.get(m.name),
      })),
    [members, colorMap]
  );

  const canSend =
    member.trim().length > 0 &&
    textDraft.value.trim().length > 0 &&
    summary.trim().length > 0 &&
    !sending;

  const handleSubmit = (): void => {
    if (!canSend) return;
    const rawText = textDraft.value.trim();
    const finalText = quote ? buildReplyBlock(quote.from, quote.text, rawText) : rawText;
    onSend(member.trim(), finalText, summary.trim());
    textDraft.clearDraft();
  };

  const handleOpenChange = (nextOpen: boolean): void => {
    if (!nextOpen) {
      onClose();
    }
  };

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogContent className="sm:max-w-[440px]">
        <DialogHeader>
          <DialogTitle>Send Message</DialogTitle>
          <DialogDescription>Send a direct message to a team member.</DialogDescription>
        </DialogHeader>

        <div className="grid gap-4 py-2">
          <div className="grid gap-2">
            <Label htmlFor="smd-recipient">Recipient</Label>
            <Select
              value={member || NO_MEMBER}
              onValueChange={(v) => setMember(v === NO_MEMBER ? '' : v)}
            >
              <SelectTrigger id="smd-recipient">
                <SelectValue placeholder="Select member..." />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value={NO_MEMBER}>Select member...</SelectItem>
                {members.map((m) => {
                  const role = formatAgentRole(m.role) ?? formatAgentRole(m.agentType);
                  const resolvedColor = colorMap.get(m.name);
                  const memberColor = resolvedColor ? getTeamColorSet(resolvedColor) : null;
                  return (
                    <SelectItem key={m.name} value={m.name}>
                      <span className="inline-flex items-center gap-1.5">
                        {memberColor ? (
                          <span
                            className="inline-block size-2 shrink-0 rounded-full"
                            style={{ backgroundColor: memberColor.border }}
                          />
                        ) : null}
                        <span style={memberColor ? { color: memberColor.text } : undefined}>
                          {m.name}
                        </span>
                        {role ? (
                          <span className="text-[var(--color-text-muted)]">({role})</span>
                        ) : null}
                      </span>
                    </SelectItem>
                  );
                })}
              </SelectContent>
            </Select>
          </div>

          {quote ? (
            <div className="relative rounded-md border border-[var(--color-border)] bg-[var(--color-surface)] p-2.5">
              <Tooltip>
                <TooltipTrigger asChild>
                  <button
                    type="button"
                    className="absolute right-1.5 top-1.5 rounded p-0.5 text-[var(--color-text-muted)] hover:text-[var(--color-text)]"
                    onClick={() => setQuote(undefined)}
                  >
                    <X size={12} />
                  </button>
                </TooltipTrigger>
                <TooltipContent side="left">Remove quote</TooltipContent>
              </Tooltip>
              <span className="mb-0.5 block text-[10px] font-medium text-[var(--color-text-muted)]">
                Replying to @{quote.from}
              </span>
              <p className="line-clamp-3 pr-5 text-xs text-[var(--color-text-muted)]">
                {quote.text}
              </p>
            </div>
          ) : null}

          <div className="grid gap-2">
            <Label htmlFor="smd-message">Message</Label>
            <MentionableTextarea
              id="smd-message"
              placeholder="Write your message..."
              value={textDraft.value}
              onValueChange={textDraft.setValue}
              suggestions={mentionSuggestions}
              minRows={4}
              maxRows={12}
              footerRight={
                textDraft.isSaved ? (
                  <span className="text-[10px] text-[var(--color-text-muted)]">Draft saved</span>
                ) : null
              }
            />
          </div>

          <div className="grid gap-2">
            <Label htmlFor="smd-summary">Summary</Label>
            <Input
              id="smd-summary"
              className="h-8 text-xs"
              placeholder="Brief summary reflecting the message intent"
              value={summary}
              onChange={(e) => setSummary(e.target.value)}
            />
            <p className="text-[11px] text-[var(--color-text-muted)]">
              Shown as notification preview. Team lead also sees this for peer messages.
            </p>
          </div>

          {sendError ? <p className="text-xs text-red-400">{sendError}</p> : null}
        </div>

        <DialogFooter>
          <Button variant="outline" size="sm" onClick={onClose} disabled={sending}>
            Cancel
          </Button>
          <Button size="sm" onClick={handleSubmit} disabled={!canSend}>
            {sending ? 'Sending...' : 'Send'}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
};