import { useState, useCallback, useEffect } from "react";
import { useParams, useNavigate } from "react-router";
import { Masthead } from "../components/Masthead";
import { DirectiveList } from "../components/directives/DirectiveList";
import { DirectiveDetail } from "../components/directives/DirectiveDetail";
import { useDirectives } from "../hooks/useDirectives";
import { useAuth } from "../contexts/AuthContext";
import type {
  DirectiveWithChains,
  CreateDirectiveRequest,
} from "../lib/api";

export default function DirectivesPage() {
  const { isAuthenticated, isAuthConfigured, isLoading: authLoading } = useAuth();
  const navigate = useNavigate();

  // Redirect to login if not authenticated (when auth is configured)
  useEffect(() => {
    if (!authLoading && isAuthConfigured && !isAuthenticated) {
      navigate("/login");
    }
  }, [authLoading, isAuthConfigured, isAuthenticated, navigate]);

  if (authLoading) {
    return (
      <div className="relative z-10 min-h-screen flex flex-col bg-[#0a1628]">
        <Masthead showNav />
        <main className="flex-1 flex items-center justify-center">
          <p className="text-[#7788aa] font-mono text-sm">Loading...</p>
        </main>
      </div>
    );
  }

  if (isAuthConfigured && !isAuthenticated) {
    return null;
  }

  return <DirectivesContent />;
}

function DirectivesContent() {
  const { id } = useParams<{ id?: string }>();
  const navigate = useNavigate();
  const {
    directives,
    loading,
    error,
    fetchDirective,
    saveDirective,
    removeDirective,
    startDirective,
  } = useDirectives();

  const [selectedDirective, setSelectedDirective] =
    useState<DirectiveWithChains | null>(null);
  const [detailLoading, setDetailLoading] = useState(false);
  const [showCreateForm, setShowCreateForm] = useState(false);
  const [createTitle, setCreateTitle] = useState("");
  const [createGoal, setCreateGoal] = useState("");
  const [createRepoUrl, setCreateRepoUrl] = useState("");

  // Load directive when ID changes
  useEffect(() => {
    if (id) {
      setDetailLoading(true);
      fetchDirective(id).then((d) => {
        setSelectedDirective(d);
        setDetailLoading(false);
      });
    } else {
      setSelectedDirective(null);
    }
  }, [id, fetchDirective]);

  const handleSelect = useCallback(
    (directiveId: string) => {
      navigate(`/directives/${directiveId}`);
    },
    [navigate]
  );

  const handleBack = useCallback(() => {
    navigate("/directives");
  }, [navigate]);

  const handleCreate = useCallback(async () => {
    if (!createTitle.trim() || !createGoal.trim()) return;

    const data: CreateDirectiveRequest = {
      title: createTitle.trim(),
      goal: createGoal.trim(),
    };
    if (createRepoUrl.trim()) {
      data.repositoryUrl = createRepoUrl.trim();
    }

    const result = await saveDirective(data);
    if (result) {
      setShowCreateForm(false);
      setCreateTitle("");
      setCreateGoal("");
      setCreateRepoUrl("");
    }
  }, [createTitle, createGoal, createRepoUrl, saveDirective]);

  const handleDelete = useCallback(
    async (directiveId: string) => {
      const ok = await removeDirective(directiveId);
      if (ok && id === directiveId) {
        navigate("/directives");
      }
    },
    [removeDirective, id, navigate]
  );

  const handleStart = useCallback(
    async (directiveId: string) => {
      const ok = await startDirective(directiveId);
      if (ok) {
        // Refresh the detail view
        const updated = await fetchDirective(directiveId);
        if (updated) {
          setSelectedDirective(updated);
        }
      }
    },
    [startDirective, fetchDirective]
  );

  const handleRefresh = useCallback(
    (updated: DirectiveWithChains) => {
      setSelectedDirective(updated);
    },
    []
  );

  return (
    <div className="relative z-10 min-h-screen flex flex-col bg-[#0a1628]">
      <Masthead showNav />
      <main className="flex-1 flex flex-col p-4 pt-2 gap-4 overflow-hidden">
        {error && (
          <div className="p-3 bg-red-400/10 border border-red-400/30 text-red-400 font-mono text-sm">
            {error}
          </div>
        )}

        {/* Create directive form */}
        {showCreateForm && (
          <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 p-4">
            <div className="w-full max-w-lg max-h-[90vh] overflow-y-auto p-6 bg-[#0a1628] border border-[rgba(117,170,252,0.3)]">
              <h3 className="font-mono text-sm text-[#75aafc] uppercase mb-4">
                New Directive
              </h3>
              <div className="space-y-3">
                <div>
                  <label className="block font-mono text-xs text-[#8b949e] uppercase mb-1">
                    Title
                  </label>
                  <input
                    type="text"
                    placeholder="Title"
                    value={createTitle}
                    onChange={(e) => setCreateTitle(e.target.value)}
                    className="w-full px-3 py-2 font-mono text-sm text-[#dbe7ff] bg-[#0d1b2d] border border-[#3f6fb3] focus:border-[#75aafc] outline-none"
                    autoFocus
                  />
                </div>
                <div>
                  <label className="block font-mono text-xs text-[#8b949e] uppercase mb-1">
                    Goal
                  </label>
                  <textarea
                    placeholder="What should be accomplished?"
                    value={createGoal}
                    onChange={(e) => setCreateGoal(e.target.value)}
                    rows={3}
                    className="w-full px-3 py-2 font-mono text-sm text-[#dbe7ff] bg-[#0d1b2d] border border-[#3f6fb3] focus:border-[#75aafc] outline-none resize-none"
                  />
                </div>
                <div>
                  <label className="block font-mono text-xs text-[#8b949e] uppercase mb-1">
                    Repository URL (optional)
                  </label>
                  <input
                    type="text"
                    placeholder="https://github.com/user/repo.git"
                    value={createRepoUrl}
                    onChange={(e) => setCreateRepoUrl(e.target.value)}
                    className="w-full px-3 py-2 font-mono text-sm text-[#dbe7ff] bg-[#0d1b2d] border border-[#3f6fb3] focus:border-[#75aafc] outline-none"
                  />
                </div>
                <div className="flex gap-2 justify-end pt-2">
                  <button
                    onClick={() => {
                      setShowCreateForm(false);
                      setCreateTitle("");
                      setCreateGoal("");
                      setCreateRepoUrl("");
                    }}
                    className="px-4 py-2 font-mono text-xs text-[#9bc3ff] hover:text-[#dbe7ff] transition-colors"
                  >
                    Cancel
                  </button>
                  <button
                    onClick={handleCreate}
                    disabled={!createTitle.trim() || !createGoal.trim()}
                    className="px-4 py-2 font-mono text-xs text-[#dbe7ff] bg-[#0f3c78] border border-[#3f6fb3] hover:bg-[#153667] transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
                  >
                    Create
                  </button>
                </div>
              </div>
            </div>
          </div>
        )}

        <div className="flex-1 grid grid-cols-[350px_1fr] gap-4 min-h-0">
          {/* Directive list */}
          <DirectiveList
            directives={directives}
            loading={loading}
            onSelect={handleSelect}
            onCreate={() => setShowCreateForm(true)}
            onDelete={(d) => handleDelete(d.id)}
            selectedId={id}
          />

          {/* Directive detail or empty state */}
          {detailLoading ? (
            <div className="panel h-full flex items-center justify-center">
              <p className="text-[#7788aa] font-mono text-sm">Loading directive...</p>
            </div>
          ) : selectedDirective ? (
            <DirectiveDetail
              directive={selectedDirective}
              onBack={handleBack}
              onDelete={handleDelete}
              onStart={handleStart}
              onRefresh={handleRefresh}
            />
          ) : (
            <div className="panel h-full flex items-center justify-center">
              <div className="text-center">
                <p className="font-mono text-sm text-[#555] mb-4">
                  Select a directive or create a new one
                </p>
                <button
                  onClick={() => setShowCreateForm(true)}
                  className="px-4 py-2 font-mono text-xs text-[#dbe7ff] bg-[#0f3c78] border border-[#3f6fb3] hover:bg-[#153667] transition-colors uppercase"
                >
                  + New Directive
                </button>
              </div>
            </div>
          )}
        </div>
      </main>
    </div>
  );
}