import {
  BookOpen,
  Home,
  LineChart,
  MessageSquareText,
  UserRound,
} from "lucide-react";
import type { LucideIcon } from "lucide-react";

export type MissionStepId = "lesson" | "notes" | "quiz" | "feedback" | "next";
export type MobileScreenId = "today" | "lesson" | "notes" | "quiz" | "feedback" | "weakAreas" | "next";

export type SourceRef = {
  file_name: string;
  book?: string;
  printed_page?: number;
  pdf_page?: number;
};

export type SessionNavItem = {
  label: string;
  href: string;
  icon: LucideIcon;
  active?: boolean;
};

export type MissionStep = {
  id: MissionStepId;
  label: string;
};

export type NoteCardData = {
  id: number;
  title: string;
  body: string;
  tag?: string;
  tone?: "default" | "warning";
  source_refs?: SourceRef[];
};

export type QuizOptionData = {
  key: "A" | "B" | "C" | "D";
  text: string;
};

export type TuitionQuizData = {
  id?: string;
  mode?: "choice" | "review";
  questionNumber: number;
  totalQuestions: number;
  question: string;
  source?: string;
  options: QuizOptionData[];
  correctOption: QuizOptionData["key"];
  answerOutline?: string;
  keywords?: string[];
  questionType?: string;
  marks?: number;
  source_refs?: SourceRef[];
};

export type TuitionFeedbackData = {
  why: string;
  conceptTested: string;
  mistake: string;
  toRevise: string;
  source?: string;
  source_refs?: SourceRef[];
};

export type WeakAreaData = {
  label: string;
  accuracy?: number;
  status: "Weak" | "Average" | "Review";
  studentAnswer?: string;
  correctAnswer?: string;
  source_refs?: SourceRef[];
};

export type FlashcardData = {
  front: string;
  back: string;
  type: string;
  status: string;
  marks?: number;
  source_refs: SourceRef[];
};

export type AnswerCorrectionRuleData = {
  id: string;
  applies_to: string[];
  rule: string;
  keyword_map?: Record<string, string[]>;
  source_refs: SourceRef[];
};

export type TuitionSessionData = {
  student: {
    name: string;
    initials: string;
    streak: string;
  };
  brand: {
    name: string;
    tagline: string;
  };
  classLabel: string;
  board?: string;
  subject?: string;
  chapterLabel: string;
  chapterShortTitle: string;
  chapterSubtitle: string;
  missionLabel: string;
  missionGoal: string;
  missionId?: string;
  chapterId?: string;
  missionTitle?: string;
  nextMissionTitle?: string;
  sessionProgress: number;
  estimatedTime: string;
  video: {
    currentTime: string;
    duration: string;
    speed: string;
    progress: number;
  };
  lessonTakeaway: string;
  lessonBoard: {
    title: string;
    subtitle: string;
    points: string[];
    source_refs?: SourceRef[];
  };
  formulaText: string;
  missionSteps: readonly MissionStep[];
  notes: NoteCardData[];
  quiz: TuitionQuizData;
  feedback: TuitionFeedbackData;
  checklist: string[];
  doubtTeacher: {
    question: string;
    answer: string;
  };
  weakAreas: WeakAreaData[];
  flashcards: FlashcardData[];
  nextStep: {
    completedTitle: string;
    completedSubtitle: string;
    tomorrowPlan: string[];
  };
  answerCorrectionRules: AnswerCorrectionRuleData[];
  source_refs: SourceRef[];
  formulas?: unknown[];
  derivations?: unknown[];
  numericalPatterns?: unknown[];
  visualLessonFrames?: unknown[];
};

export const missionSteps = [
  { id: "lesson", label: "Watch Lesson" },
  { id: "notes", label: "Key Notes" },
  { id: "quiz", label: "Quiz" },
  { id: "feedback", label: "Feedback" },
  { id: "next", label: "Next Step" },
] as const satisfies readonly MissionStep[];

export const missionStageOrder = missionSteps.map((step) => step.id) satisfies MissionStepId[];
export const mobileMissionFlow = ["today", "lesson", "notes", "quiz", "feedback", "weakAreas", "next"] as const satisfies readonly MobileScreenId[];
export const noteTabs = ["Key Notes", "Formula Sheet", "Board Answer"] as const;

export const missionNextActions: Record<MissionStepId, string> = {
  lesson: "Watch the source-backed lesson",
  notes: "Read the 5 key notes",
  quiz: "Answer the mission quiz",
  feedback: "Review the answer rule",
  next: "Save weak areas and continue",
};

export const tuitionSession: TuitionSessionData = {
  student: {
    name: "Asnan",
    initials: "AS",
    streak: "",
  },
  brand: {
    name: "DocDoe",
    tagline: "Today's Tuition",
  },
  classLabel: "+2 Physics",
  chapterLabel: "Chapter 1: Electric Charges and Fields",
  chapterShortTitle: "Chapter 1",
  chapterSubtitle: "Electric Charges and Fields",
  missionLabel: "Today's Chapter Mission",
  missionGoal: "Understand Coulomb's Law, finish one quiz, fix weak points.",
  sessionProgress: 65,
  estimatedTime: "~45 mins",
  video: {
    currentTime: "12:18",
    duration: "28:40",
    speed: "1.0x",
    progress: 43,
  },
  lessonTakeaway:
    "Force \u221d q\u2081q\u2082 and Force \u221d 1/r\u00b2. Doubling distance \u2192 force becomes 1/4th.",
  lessonBoard: {
    title: "Coulomb's Law",
    subtitle: "Electric Charges and Fields",
    points: [
      "Force is directly proportional to the product of charges.",
      "Force is inversely proportional to the square of distance.",
      "Force acts along the line joining two point charges.",
    ],
    source_refs: [],
  },
  formulaText: "F = k |q1 q2| / r\u00b2",
  missionSteps,
  notes: [
    {
      id: 1,
      title: "Law statement",
      body: "Force between two point charges is directly proportional to the product of charges.",
      tag: "NCERT 1.1",
    },
    {
      id: 2,
      title: "Formula",
      body: "F = k |q\u2081q\u2082| / r\u00b2, where k = 9 \u00d7 10\u2079 N m\u00b2/C\u00b2.",
      tag: "Board formula",
    },
    {
      id: 3,
      title: "Meaning of r\u00b2",
      body: "When distance doubles, force becomes one-fourth. This is the inverse square relation.",
      tag: "PYQ 2024",
    },
    {
      id: 4,
      title: "Direction of force",
      body: "Force acts along the straight line joining the two point charges.",
      tag: "NCERT 1.2",
    },
    {
      id: 5,
      title: "Common exam mistake",
      body: "Using r instead of r\u00b2 is the #1 error in board exams.",
      tag: "Exam alert",
      tone: "warning",
    },
  ] satisfies NoteCardData[],
  quiz: {
    questionNumber: 1,
    totalQuestions: 5,
    question:
      "According to Coulomb's law, what happens to the electrostatic force between two point charges if the distance between them is doubled?",
    source: "PYQ 2024",
    options: [
      { key: "A", text: "It becomes half" },
      { key: "B", text: "It becomes one-fourth" },
      { key: "C", text: "It becomes four times" },
      { key: "D", text: "It remains the same" },
    ] satisfies QuizOptionData[],
    correctOption: "B" as const,
  },
  feedback: {
    why: "F is proportional to 1/r\u00b2. If r becomes 2r, (2r)\u00b2 = 4r\u00b2, making the force 1/4th.",
    conceptTested: "Inverse square dependence of Coulomb's Law",
    mistake: "You chose 1/r instead of 1/r\u00b2. This is the most common board exam error.",
    toRevise: "Mathematical interpretation of inverse square laws.",
    source: "NCERT Ch.1, Ex. 1.1",
  },
  checklist: [
    "Learn today's concept",
    "Read the key notes",
    "Pass the checkpoints",
    "Fix weak areas",
    "Save revision",
  ],
  doubtTeacher: {
    question: "Why does the force act strictly along the line joining them?",
    answer:
      "Because electrostatic force is a central force. By symmetry, the only unique direction between two point charges is the straight line connecting them.",
  },
  weakAreas: [
    { label: "Inverse square law", accuracy: 30, status: "Weak", studentAnswer: "half", correctAnswer: "one-fourth" },
    { label: "Units & dimensions", accuracy: 60, status: "Average" },
    { label: "Direction of force", accuracy: 70, status: "Average" },
  ] satisfies WeakAreaData[],
  flashcards: [],
  nextStep: {
    completedTitle: "Great job, Asnan!",
    completedSubtitle: "You've completed today's mission.",
    tomorrowPlan: ["Revise: Inverse square law", "Learn: Gauss's Theorem"],
  },
  answerCorrectionRules: [],
  source_refs: [],
  formulas: [],
  derivations: [],
  numericalPatterns: [],
  visualLessonFrames: [],
};

/** Minimal global rail — Progress holds weekly plan, weak areas, revision, practice. */
export const sessionNavItems: SessionNavItem[] = [
  { label: "Today", href: "/tuition", icon: Home, active: true },
  { label: "Learn Anything", href: "/learn-anything", icon: BookOpen },
  { label: "Study Chat", href: "/study-chat", icon: MessageSquareText },
  { label: "Progress", href: "/progress", icon: LineChart },
  { label: "Profile", href: "/settings", icon: UserRound },
];

export const mobileBottomNavItems: SessionNavItem[] = [
  { label: "Today", href: "/tuition", icon: Home, active: true },
  { label: "Learn", href: "/learn-anything", icon: BookOpen },
  { label: "Chat", href: "/study-chat", icon: MessageSquareText },
  { label: "Progress", href: "/progress", icon: LineChart },
  { label: "Profile", href: "/settings", icon: UserRound },
];