import { FileText } from "lucide-react";
import { Text } from "@/components/ui/text";
import { CompDocDocumentFrame } from "@/app/(protected)/workorders/_components/comp-doc/comp-doc-document-frame";
import { CompDocPreviewHeader } from "@/app/(protected)/workorders/_components/comp-doc/comp-doc-preview-header";
import { CompDocProcedureHeading } from "@/app/(protected)/workorders/_components/comp-doc/comp-doc-procedure-heading";
import { CompDocSafetyBullets } from "@/app/(protected)/workorders/_components/comp-doc/comp-doc-safety-bullets";
import {
  AUTO_POPULATED_FIELDS,
  COMPLETION_TEMPLATE_COPY,
} from "@/domain/completion-templates/constants/completion-template-constants";
import type { CompletionTemplateProcedure } from "@/domain/completion-templates/types/completion-template";
import { descriptionLines } from "@/domain/completion-templates/utils/description-lines";

export interface CompletionTemplatePreviewValues {
  name: string;
  extraSafetyNote: string | null;
  procedures: CompletionTemplateProcedure[];
}

type CompletionTemplatePreviewProps = {
  values: CompletionTemplatePreviewValues;
  isEditing: boolean;
};

function PreviewPill({ isEditing }: { isEditing: boolean }) {
  return (
    <div className="flex shrink-0 items-center justify-center" style={{ padding: "12px 0" }}>
      <span
        className="inline-flex items-center gap-1.5"
        style={{
          height: 28,
          padding: "0 12px",
          borderRadius: 9999,
          background: "var(--color-bg-surface)",
          border: "1px solid var(--color-border)",
          fontSize: 12,
          fontWeight: 500,
          color: "var(--muted-foreground)",
        }}
      >
        <FileText size={13} />
        {isEditing ? "Live preview" : "Document preview"}
      </span>
    </div>
  );
}

function PreviewTitle({ name }: { name: string }) {
  const title = name.trim();
  return (
    <>
      <Text
        as="h2"
        variant="title"
        family="body"
        sx={{
          fontSize: 13,
          fontWeight: 700,
          letterSpacing: "0.02em",
          color: title ? "#161E38" : "#9CA3AF",
          margin: "16px 0 4px",
        }}
      >
        {title ? title.toUpperCase() : COMPLETION_TEMPLATE_COPY.untitledDocument}
      </Text>
      <Text variant="body" sx={{ fontSize: 12, color: "#58595B", margin: "2px 0 12px" }}>
        {AUTO_POPULATED_FIELDS.join(" · ")} {COMPLETION_TEMPLATE_COPY.autoFilledSuffix}
      </Text>
    </>
  );
}

function PreviewProcedures({ procedures }: { procedures: CompletionTemplateProcedure[] }) {
  if (procedures.length === 0) {
    return (
      <Text
        variant="body"
        sx={{ fontSize: 12.5, color: "#9CA3AF", margin: "16px 0 0", fontStyle: "italic" }}
      >
        {COMPLETION_TEMPLATE_COPY.noProcedurePreview}
      </Text>
    );
  }
  return (
    <>
      {procedures.map((procedure, index) => (
        <section key={index} aria-label={`Preview procedure ${index + 1}`}>
          <CompDocProcedureHeading>
            {procedure.name.trim() || `Procedure ${index + 1}`}
          </CompDocProcedureHeading>
          {descriptionLines(procedure.description).map((line, lineIndex) => (
            <Text
              key={lineIndex}
              variant="body"
              sx={{ fontSize: 13, lineHeight: 1.5, color: "#161E38", margin: "4px 0" }}
            >
              {line}
            </Text>
          ))}
        </section>
      ))}
    </>
  );
}

/** The template rendered on the same page, header and safety bullets as a work order's document. */
export function CompletionTemplatePreview({ values, isEditing }: CompletionTemplatePreviewProps) {
  const note = values.extraSafetyNote?.trim() ?? "";
  return (
    <div
      className="flex min-h-0 flex-col"
      style={{
        width: "58%",
        borderRight: "1px solid var(--color-border)",
        background: "var(--color-bg-muted)",
      }}
    >
      <PreviewPill isEditing={isEditing} />
      <div
        className="min-h-0 flex-1 overflow-x-hidden overflow-y-auto"
        style={{ padding: "0 20px 20px" }}
        data-testid="completion-template-preview"
      >
        <CompDocDocumentFrame>
          <CompDocPreviewHeader />
          <PreviewTitle name={values.name} />
          <CompDocSafetyBullets extra={note === "" ? [] : [note]} />
          <PreviewProcedures procedures={values.procedures} />
        </CompDocDocumentFrame>
      </div>
    </div>
  );
}