import { translate } from "@/lib/i18n/messages";
import type { Locale } from "@/lib/i18n/locales";

export type GuideValidationSection = "weapon" | "artifact" | "constellations" | "team" | "extra";

interface ValidationIssue {
  path: readonly PropertyKey[];
  message: string;
}

const fieldMessages: Record<string, string> = {
  weaponKey: "กรุณาเลือกอาวุธ",
  firstArtifactKey: "กรุณาเลือก Artifact ชุดแรก",
  characterKey: "กรุณาเลือกตัวละคร",
  overallPercent: "กรุณากรอก Overall % ระหว่าง -9,999 ถึง 9,999",
  personalPercent: "กรุณากรอก Personal % ระหว่าง -9,999 ถึง 9,999",
  percent: "กรุณากรอกเปอร์เซ็นต์ระหว่าง -9,999 ถึง 9,999",
  cumulativePercent: "กรุณากรอก Cumulative % ระหว่าง -9,999 ถึง 9,999",
  title: "กรุณากรอกชื่อไม่เกิน 160 ตัวอักษร",
  heading: "กรุณากรอกหัวข้อไม่เกิน 200 ตัวอักษร",
  combo: "กรุณากรอก Combo",
  rotationSeconds: "กรุณากรอก Rotation เป็นตัวเลขมากกว่า 0",
  damage: "กรุณากรอก Damage เป็นตัวเลข 0 ขึ้นไป",
};

const sectionLabels: Record<GuideValidationSection, string> = {
  weapon: "Weapon tier list",
  artifact: "Artifact",
  constellations: "Constellations",
  team: "Team Calc",
  extra: "Extra sections",
};

function indexAfter(path: readonly PropertyKey[], key: string): number | null {
  const position = path.indexOf(key);
  const value = path[position + 1];
  return position >= 0 && typeof value === "number" ? value : null;
}

function issueContext(section: GuideValidationSection, path: readonly PropertyKey[], teamNames?: readonly string[], locale: Locale = "th"): string {
  const rowIndex = indexAfter(path, "rows");
  const groupIndex = indexAfter(path, "groups");
  const teamIndex = indexAfter(path, "teams");
  const memberIndex = indexAfter(path, "members");
  const sectionIndex = indexAfter(path, "sections");

  if (section === "weapon" && groupIndex === null && rowIndex !== null) return translate("อาวุธอันดับ {rank}", { rank: rowIndex + 1 }, locale);
  if (section === "weapon" && groupIndex !== null) {
    return rowIndex === null ? `Condition ${groupIndex + 1}` : translate("Condition {index} · อาวุธอันดับ {rank}", { index: groupIndex + 1, rank: rowIndex + 1 }, locale);
  }
  if (section === "artifact" && groupIndex !== null) {
    const group = groupIndex === 0 ? "Late Game" : "Early Game";
    return rowIndex === null ? `Artifact ${group}` : translate("Artifact {name} อันดับ {rank}", { name: group, rank: rowIndex + 1 }, locale);
  }
  if (section === "constellations" && groupIndex !== null) {
    return rowIndex === null ? `Condition ${groupIndex + 1}` : `Condition ${groupIndex + 1} · C${rowIndex + 1}`;
  }
  if (section === "team" && teamIndex !== null) {
    const teamName = teamNames?.[teamIndex]?.trim() || `Team ${teamIndex + 1}`;
    return memberIndex === null ? teamName : translate("{name} · ตัวละคร {index}", { name: teamName, index: memberIndex + 1 }, locale);
  }
  if (section === "extra" && sectionIndex !== null) {
    return rowIndex === null ? `Extra section ${sectionIndex + 1}` : translate("Extra section {index} · แถว {row}", { index: sectionIndex + 1, row: rowIndex + 1 }, locale);
  }
  return sectionLabels[section];
}

function issueMessage(issue: ValidationIssue): string {
  const field = issue.path.at(-1);
  if (typeof field === "string" && fieldMessages[field]) return fieldMessages[field];
  if (/[฀-๿]/u.test(issue.message)) return issue.message;
  if (issue.message.startsWith("Too small")) return "กรุณากรอกข้อมูลให้ครบ";
  if (issue.message.startsWith("Too big")) return "ข้อมูลเกินจำนวนหรือความยาวที่กำหนด";
  return "กรุณาตรวจสอบข้อมูลให้ถูกต้อง";
}

export function formatGuideValidationIssues(
  section: GuideValidationSection,
  issues: readonly ValidationIssue[],
  options: { teamNames?: readonly string[]; locale?: Locale } = {},
): string[] {
  return issues.map((issue) => `${issueContext(section, issue.path, options.teamNames, options.locale)}: ${translate(issueMessage(issue), {}, options.locale)}`);
}