import { useState } from "react";
import { Loader2, X } from "lucide-react";
import { createAnalysis, type Analysis, type DataBindItem } from "@/services/orchestrationApi";
import { BusinessQuestionsEditor } from "./BusinessQuestionsEditor";
import { DataBindSelector } from "./DataBindSelector";
import { compactQuestions } from "./utils";


function formatCreateAnalysisError(err: unknown) {
  const message = err instanceof Error ? err.message : "Failed to create analysis";
  if (message.includes("unsupported jsonb version")) {
    return "Backend analysis creation is blocked by a JSONB storage error. The request payload is valid, but the Golang service/database returned an internal JSONB validation failure. Please fix POST /api/v1/analyses before creating an analysis.";
  }
  if (message.toLowerCase().includes("invalid request body")) {
    return "Backend rejected the analysis payload. Check that POST /api/v1/analyses accepts analysis_title, objective, business_questions, and data_bind as documented.";
  }
  return message;
}
function isDuplicateName(candidate: string, existing: Analysis[]): boolean {
  const normalized = candidate.trim().toLowerCase();
  if (!normalized) return false;
  return existing.some((a) => a.analysis_title.trim().toLowerCase() === normalized);
}

interface NewAnalysisDialogProps {
  open: boolean;
  onClose: () => void;
  onCreated: (analysis: Analysis) => void;
  existingAnalyses: Analysis[];
}

export function NewAnalysisDialog({ open, onClose, onCreated, existingAnalyses }: NewAnalysisDialogProps) {
  const [title, setTitle] = useState("");
  const [objective, setObjective] = useState("");
  const [questions, setQuestions] = useState<string[]>(["", ""]);
  const [dataBind, setDataBind] = useState<DataBindItem[]>([]);
  const [submitting, setSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);

  if (!open) return null;

  const duplicateName = isDuplicateName(title, existingAnalyses);

  const canSubmit =
    title.trim() &&
    !duplicateName &&
    objective.trim() &&
    compactQuestions(questions).length >= 2 &&
    dataBind.length > 0;

  const submit = async (event: React.FormEvent) => {
    event.preventDefault();
    if (!canSubmit) return;
    setSubmitting(true);
    setError(null);
    try {
      const analysis = await createAnalysis({
        analysis_title: title.trim(),
        objective: objective.trim(),
        business_questions: compactQuestions(questions),
        data_bind: dataBind,
      });
      onCreated(analysis);
      setTitle("");
      setObjective("");
      setQuestions(["", ""]);
      setDataBind([]);
      onClose();
    } catch (err) {
      setError(formatCreateAnalysisError(err));
    } finally {
      setSubmitting(false);
    }
  };

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-slate-950/40 p-4 backdrop-blur-sm">
      <form onSubmit={submit} className="flex max-h-[90vh] w-full max-w-2xl flex-col rounded-lg bg-white shadow-2xl">
        <div className="flex items-center justify-between border-b border-slate-200 px-5 py-4">
          <div>
            <h2 className="text-base font-semibold text-slate-900">New Analysis</h2>
            <p className="text-xs text-slate-500">Set the goal and bind the sources before starting the conversation.</p>
          </div>
          <button type="button" aria-label="Close new analysis" onClick={onClose} className="rounded-md p-2 text-slate-500 hover:bg-slate-100">
            <X className="h-4 w-4" />
          </button>
        </div>

        <div className="min-h-0 flex-1 space-y-4 overflow-y-auto px-5 py-4">
          <div className="space-y-1.5">
            <label htmlFor="analysis-title" className="text-xs font-medium text-slate-600">Title</label>
            <input
              id="analysis-title"
              value={title}
              onChange={(event) => setTitle(event.target.value)}
              disabled={submitting}
              placeholder="Q3 revenue movement"
              className="w-full rounded-lg border border-slate-200 px-3 py-2 text-sm outline-none focus:border-emerald-500 focus:ring-2 focus:ring-emerald-100"
            />
            {duplicateName && (
              <p className="text-xs text-red-600">An analysis with this name already exists. Choose a different name.</p>
            )}
          </div>

          <div className="space-y-1.5">
            <label htmlFor="analysis-objective" className="text-xs font-medium text-slate-600">Objective</label>
            <textarea
              id="analysis-objective"
              value={objective}
              onChange={(event) => setObjective(event.target.value)}
              disabled={submitting}
              rows={3}
              placeholder="Find the drivers, risks, and next steps behind the business question."
              className="w-full resize-none rounded-lg border border-slate-200 px-3 py-2 text-sm outline-none focus:border-emerald-500 focus:ring-2 focus:ring-emerald-100"
            />
          </div>

          <BusinessQuestionsEditor value={questions} onChange={setQuestions} disabled={submitting} />
          <DataBindSelector value={dataBind} onChange={setDataBind} disabled={submitting} />
          {error && <p className="rounded-md border border-red-200 bg-red-50 px-3 py-2 text-xs leading-5 text-red-700">{error}</p>}
        </div>

        <div className="flex items-center justify-end gap-2 border-t border-slate-200 px-5 py-4">
          <button type="button" onClick={onClose} className="rounded-md px-3 py-2 text-sm font-medium text-slate-600 hover:bg-slate-100">
            Cancel
          </button>
          <button
            type="submit"
            disabled={!canSubmit || submitting}
            className="inline-flex items-center gap-2 rounded-md bg-emerald-600 px-4 py-2 text-sm font-medium text-white hover:bg-emerald-700 disabled:cursor-not-allowed disabled:opacity-50"
          >
            {submitting && <Loader2 className="h-4 w-4 animate-spin" />}
            Create Analysis
          </button>
        </div>
      </form>
    </div>
  );
}