import type { ReactNode } from "react";
import { Card, CardContent, CardHeader } from "../components/ui/card";
import { Badge } from "../components/ui/badge";
import type { CtePlanCte, CtePlanFilter, CtePlanV2 } from "./artifactV2";

const CHIP =
  "min-w-0 max-w-full whitespace-pre-wrap [overflow-wrap:anywhere] rounded-md bg-muted px-1.5 py-0.5 font-mono text-xs text-foreground/90";
const FIELD_LABEL = "text-[0.65rem] font-semibold uppercase tracking-[0.08em] text-muted-foreground";

function Chip({ children }: { children: ReactNode }) {
  return <span className={CHIP}>{children}</span>;
}

function FilterRow({ filter, index }: { filter: CtePlanFilter; index: number }) {
  return (
    <div
      role="group"
      aria-label={`Filter ${index}`}
      className="min-w-0 space-y-2 px-3 py-1 sm:px-4"
    >
      <div className="grid min-w-0 grid-cols-1 gap-2 md:grid-cols-[minmax(0,1fr)_minmax(5rem,auto)_minmax(0,1fr)]">
        <div className="min-w-0 space-y-1">
          <p className={FIELD_LABEL}>Column</p>
          <code className="block min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] font-mono text-xs leading-4 text-foreground">
            {filter.column}
          </code>
        </div>
        <div className="min-w-0 space-y-1 md:text-center">
          <p className={FIELD_LABEL}>Operator</p>
          <code className="block min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] font-mono text-xs font-semibold leading-4 text-primary">
            {filter.op}
          </code>
        </div>
        <div className="min-w-0 space-y-1">
          <p className={FIELD_LABEL}>Value</p>
          <code className="block min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] font-mono text-xs leading-4 text-foreground">
            {filter.value}
          </code>
        </div>
      </div>
      {(filter.description || filter.rationale) && (
        <div className="grid min-w-0 gap-x-4 gap-y-1 border-t border-border/50 pt-1 md:grid-cols-[5.5rem_minmax(0,1fr)]">
          {filter.description && (
            <>
              <span className={FIELD_LABEL}>Description</span>
              <p className="min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] text-xs leading-4 text-muted-foreground">
                {filter.description}
              </p>
            </>
          )}
          {filter.rationale && (
            <>
              <span className={FIELD_LABEL}>Rationale</span>
              <p className="min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] text-xs leading-4 text-muted-foreground">
                {filter.rationale}
              </p>
            </>
          )}
        </div>
      )}
    </div>
  );
}

function CteCard({ cte, total }: { cte: CtePlanCte; total: number }) {
  const dependsOn = cte.depends_on ?? [];

  return (
    <Card className="gap-0 rounded-lg border py-0 shadow-none">
      <CardHeader className="gap-2 rounded-t-lg border-b border-border/60 bg-muted/15 px-3 py-2 sm:px-4 [&.border-b]:pb-2">
        <div className="grid min-w-0 grid-cols-[auto_minmax(0,1fr)] items-center gap-2.5">
          <Badge variant="outline" className="font-mono">
            CTE {cte.index}/{total}
          </Badge>
          <h3 className="min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] font-mono text-sm font-medium leading-5">
            {cte.name}
          </h3>
        </div>
        {cte.purpose && (
          <p className="min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] text-sm leading-5 text-muted-foreground">
            {cte.purpose}
          </p>
        )}
      </CardHeader>
      <CardContent className="flex min-w-0 flex-col gap-3 px-3 py-2 sm:px-4">
        <div className="grid min-w-0 gap-3 md:grid-cols-2">
          <section className="min-w-0">
            <h4 className="thot-label mb-1">Depends on</h4>
            {dependsOn.length ? (
              <div className="flex min-w-0 flex-wrap gap-1.5">
                {dependsOn.map((dependency) => (
                  <Chip key={dependency}>{dependency}</Chip>
                ))}
              </div>
            ) : (
              <p className="text-xs text-muted-foreground">no dependencies</p>
            )}
          </section>

          {cte.keys && cte.keys.length > 0 && (
            <section className="min-w-0">
              <h4 className="thot-label mb-1">Keys</h4>
              <div className="flex min-w-0 flex-wrap gap-1.5">
                {cte.keys.map((key) => (
                  <Chip key={key}>{key}</Chip>
                ))}
              </div>
            </section>
          )}
        </div>

        {cte.tables && cte.tables.length > 0 && (
          <section className="min-w-0">
            <h4 className="thot-label mb-1">Tables</h4>
            <div className="min-w-0 divide-y divide-border/50 rounded-lg border border-border/60">
              {cte.tables.map((table) => (
                <div
                  key={table.name}
                  className="grid min-w-0 gap-1 px-3 py-1 sm:px-4 md:grid-cols-[minmax(10rem,0.8fr)_minmax(0,1.2fr)] md:gap-4"
                >
                  <code className="min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] font-mono text-xs leading-4 text-foreground">
                    {table.name}
                  </code>
                  {table.description && (
                    <p className="min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] text-xs leading-4 text-muted-foreground">
                      {table.description}
                    </p>
                  )}
                </div>
              ))}
            </div>
          </section>
        )}

        {cte.filters && cte.filters.length > 0 && (
          <section className="min-w-0">
            <h4 className="thot-label mb-1">Filters</h4>
            <div className="min-w-0 divide-y divide-border/50 rounded-lg border border-border/60">
              {cte.filters.map((f, i) => (
                <FilterRow key={`${f.column}-${i}`} filter={f} index={i + 1} />
              ))}
            </div>
          </section>
        )}

        {cte.output_columns && cte.output_columns.length > 0 && (
          <section className="min-w-0">
            <h4 className="thot-label mb-1">Output columns</h4>
            <div className="flex min-w-0 flex-wrap gap-1.5">
              {cte.output_columns.map((column) => (
                <Chip key={column}>{column}</Chip>
              ))}
            </div>
          </section>
        )}

        {cte.rationale && (
          <section className="min-w-0 border-t border-border/60 pt-1">
            <h4 className="thot-label mb-1">Rationale</h4>
            <p className="whitespace-pre-wrap [overflow-wrap:anywhere] text-sm leading-5 text-foreground/90">
              {cte.rationale}
            </p>
          </section>
        )}
      </CardContent>
    </Card>
  );
}

export function CtePlanViewer({ plan }: { plan: CtePlanV2 }) {
  return (
    <div className="flex min-w-0 flex-col gap-6">
      <div className="flex min-w-0 flex-col gap-3">
        {plan.question && (
          <div className="min-w-0 space-y-1.5">
            <p className="thot-label">Question</p>
            <p className="whitespace-pre-wrap [overflow-wrap:anywhere] text-sm leading-relaxed text-muted-foreground">
              {plan.question}
            </p>
          </div>
        )}
        {plan.strategy && (
          <div className="min-w-0 space-y-1.5">
            <p className="thot-label">Strategy</p>
            <p className="thot-prose whitespace-pre-wrap [overflow-wrap:anywhere] leading-relaxed">
              {plan.strategy}
            </p>
          </div>
        )}

        <div className="min-w-0 space-y-1.5">
          <p className="thot-label">Execution order</p>
          <div className="flex min-w-0 flex-wrap items-center gap-1.5 font-mono text-xs text-muted-foreground">
            {plan.ctes.map((c, i) => (
              <span key={c.name} className="flex min-w-0 max-w-full items-center gap-1.5">
                {i > 0 && <span aria-hidden="true">→</span>}
                <span className="min-w-0 whitespace-pre-wrap [overflow-wrap:anywhere] text-foreground/90">
                  {c.name}
                </span>
              </span>
            ))}
          </div>
        </div>
      </div>

      <ol aria-label="CTE plan steps" className="flex flex-col gap-3">
        {plan.ctes.map((cte) => (
          <li key={cte.name} className="min-w-0">
            <CteCard cte={cte} total={plan.ctes.length} />
          </li>
        ))}
      </ol>
    </div>
  );
}