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 { DirectoryInput } from "../components/mesh/DirectoryInput";
import { useDirectives } from "../hooks/useDirectives";
import { useAuth } from "../contexts/AuthContext";
import {
  getDaemonDirectories,
  getRepositorySuggestions,
} from "../lib/api";
import type {
  DirectiveWithChains,
  CreateDirectiveRequest,
  RepositorySourceType,
  DaemonDirectory,
  RepositoryHistoryEntry,
} 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("");

  // Repository state
  const [repoType, setRepoType] = useState<RepositorySourceType>("remote");
  const [repoUrl, setRepoUrl] = useState("");
  const [repoPath, setRepoPath] = useState("");
  const [suggestedDirectories, setSuggestedDirectories] = useState<DaemonDirectory[]>([]);
  const [repoSuggestions, setRepoSuggestions] = useState<RepositoryHistoryEntry[]>([]);
  const [showRepoSuggestions, setShowRepoSuggestions] = useState(false);

  // Fetch repository suggestions when modal opens and repo type changes
  useEffect(() => {
    if (showCreateForm && (repoType === "remote" || repoType === "local")) {
      getRepositorySuggestions(repoType, undefined, 10)
        .then((res) => {
          setRepoSuggestions(res.entries);
          setShowRepoSuggestions(res.entries.length > 0);
        })
        .catch(() => {
          setRepoSuggestions([]);
          setShowRepoSuggestions(false);
        });
    } else {
      setRepoSuggestions([]);
      setShowRepoSuggestions(false);
    }
  }, [showCreateForm, repoType]);

  // Fetch daemon directories when "local" repo type is selected
  useEffect(() => {
    if (repoType === "local" && showCreateForm) {
      getDaemonDirectories()
        .then((res) => setSuggestedDirectories(res.directories))
        .catch(() => setSuggestedDirectories([]));
    }
  }, [repoType, showCreateForm]);

  // Apply a repository suggestion
  const applyRepoSuggestion = useCallback((suggestion: RepositoryHistoryEntry) => {
    if (suggestion.repositoryUrl) {
      setRepoUrl(suggestion.repositoryUrl);
    }
    if (suggestion.localPath) {
      setRepoPath(suggestion.localPath);
    }
    setShowRepoSuggestions(false);
  }, []);

  // 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 resetCreateForm = useCallback(() => {
    setShowCreateForm(false);
    setCreateTitle("");
    setCreateGoal("");
    setRepoType("remote");
    setRepoUrl("");
    setRepoPath("");
  }, []);

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

    const data: CreateDirectiveRequest = {
      title: createTitle.trim(),
      goal: createGoal.trim(),
    };
    if (repoType === "remote" && repoUrl.trim()) {
      data.repositoryUrl = repoUrl.trim();
    } else if (repoType === "local" && repoPath.trim()) {
      data.localPath = repoPath.trim();
    }

    const result = await saveDirective(data);
    if (result) {
      resetCreateForm();
    }
  }, [createTitle, createGoal, repoType, repoUrl, repoPath, saveDirective, resetCreateForm]);

  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) {
        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 modal */}
        {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-4">
                {/* Title */}
                <div>
                  <label className="block font-mono text-xs text-[#8b949e] uppercase mb-1">
                    Title
                  </label>
                  <input
                    type="text"
                    placeholder="Directive 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>

                {/* Goal */}
                <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>

                {/* Repository Configuration */}
                <div className="border-t border-[rgba(117,170,252,0.2)] pt-4">
                  <label className="block font-mono text-xs text-[#75aafc] uppercase mb-3">
                    Repository (optional)
                  </label>

                  {/* Repository type selector */}
                  <div className="flex gap-2 mb-3">
                    <button
                      type="button"
                      onClick={() => setRepoType("remote")}
                      className={`flex-1 px-3 py-2 font-mono text-xs uppercase transition-colors ${
                        repoType === "remote"
                          ? "bg-[#0f3c78] text-[#dbe7ff] border border-[#75aafc]"
                          : "bg-[#0d1b2d] text-[#8b949e] border border-[#3f6fb3] hover:border-[#75aafc]"
                      }`}
                    >
                      Remote
                    </button>
                    <button
                      type="button"
                      onClick={() => setRepoType("local")}
                      className={`flex-1 px-3 py-2 font-mono text-xs uppercase transition-colors ${
                        repoType === "local"
                          ? "bg-[#0f3c78] text-[#dbe7ff] border border-[#75aafc]"
                          : "bg-[#0d1b2d] text-[#8b949e] border border-[#3f6fb3] hover:border-[#75aafc]"
                      }`}
                    >
                      Local
                    </button>
                  </div>

                  {/* Repository suggestions */}
                  {showRepoSuggestions && repoSuggestions.length > 0 && (
                    <div className="mb-3">
                      <label className="block font-mono text-xs text-[#8b949e] uppercase mb-1">
                        Recent Repositories
                      </label>
                      <div className="border border-[rgba(117,170,252,0.2)] bg-[#0a1525] max-h-32 overflow-y-auto">
                        {repoSuggestions.map((suggestion) => (
                          <button
                            key={suggestion.id}
                            type="button"
                            onClick={() => applyRepoSuggestion(suggestion)}
                            className="w-full text-left px-3 py-2 font-mono text-xs hover:bg-[rgba(117,170,252,0.1)] border-b border-[rgba(117,170,252,0.1)] last:border-b-0"
                          >
                            <div className="flex items-center justify-between">
                              <span className="text-[#9bc3ff] truncate">{suggestion.name}</span>
                              <span className="text-[10px] text-[#556677] ml-2">
                                {suggestion.useCount}&times;
                              </span>
                            </div>
                            <div className="text-[10px] text-[#556677] truncate">
                              {repoType === "local" ? suggestion.localPath : suggestion.repositoryUrl}
                            </div>
                          </button>
                        ))}
                      </div>
                    </div>
                  )}

                  {/* Repository URL (for remote) */}
                  {repoType === "remote" && (
                    <div>
                      <label className="block font-mono text-xs text-[#8b949e] uppercase mb-1">
                        Repository URL
                      </label>
                      <input
                        type="text"
                        value={repoUrl}
                        onChange={(e) => setRepoUrl(e.target.value)}
                        placeholder="https://github.com/user/repo.git"
                        className="w-full px-3 py-2 bg-[#0d1b2d] border border-[#3f6fb3] text-[#dbe7ff] font-mono text-sm focus:outline-none focus:border-[#75aafc]"
                      />
                    </div>
                  )}

                  {/* Repository path (for local) */}
                  {repoType === "local" && (
                    <div>
                      <label className="block font-mono text-xs text-[#8b949e] uppercase mb-1">
                        Local Path
                      </label>
                      <DirectoryInput
                        value={repoPath}
                        onChange={setRepoPath}
                        suggestions={suggestedDirectories}
                        placeholder="/path/to/repository"
                        repoUrl={repoUrl || null}
                      />
                    </div>
                  )}
                </div>

                {/* Actions */}
                <div className="flex gap-2 justify-end pt-2">
                  <button
                    onClick={resetCreateForm}
                    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>
  );
}