"use client";

import { useState } from "react";
import { IconGitCommit, IconGitPullRequest, IconLoader2, IconCheck } from "@tabler/icons-react";

import { Button } from "@kandev/ui/button";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
  DialogClose,
} from "@kandev/ui/dialog";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@kandev/ui/alert-dialog";
import { Checkbox } from "@kandev/ui/checkbox";
import { Label } from "@kandev/ui/label";
import { Input } from "@kandev/ui/input";
import { Textarea } from "@kandev/ui/textarea";
import { RadioGroup, RadioGroupItem } from "@kandev/ui/radio-group";

// --- Discard Confirmation Dialog ---

type DiscardDialogProps = {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  fileToDiscard: string | null;
  onConfirm: () => void;
};

export function DiscardDialog({
  open,
  onOpenChange,
  fileToDiscard,
  onConfirm,
}: DiscardDialogProps) {
  return (
    <AlertDialog open={open} onOpenChange={onOpenChange}>
      <AlertDialogContent>
        <AlertDialogHeader>
          <AlertDialogTitle>Discard changes?</AlertDialogTitle>
          <AlertDialogDescription>
            This will permanently discard all changes to{" "}
            <span className="font-semibold">{fileToDiscard}</span>. This action cannot be undone.
          </AlertDialogDescription>
        </AlertDialogHeader>
        <AlertDialogFooter>
          <AlertDialogCancel>Cancel</AlertDialogCancel>
          <AlertDialogAction
            onClick={onConfirm}
            className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
          >
            Discard
          </AlertDialogAction>
        </AlertDialogFooter>
      </AlertDialogContent>
    </AlertDialog>
  );
}

// --- Commit Dialog ---

type CommitDialogProps = {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  commitMessage: string;
  onCommitMessageChange: (value: string) => void;
  onCommit: () => void;
  isLoading: boolean;
  stagedFileCount: number;
  stagedAdditions: number;
  stagedDeletions: number;
  isAmend?: boolean;
  onAmendChange?: (amend: boolean) => void;
  lastCommitMessage?: string | null;
};

export function CommitDialog({
  open,
  onOpenChange,
  commitMessage,
  onCommitMessageChange,
  onCommit,
  isLoading,
  stagedFileCount,
  stagedAdditions,
  stagedDeletions,
  isAmend = false,
  onAmendChange,
  lastCommitMessage,
}: CommitDialogProps) {
  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <IconGitCommit className="h-5 w-5" />
            {isAmend ? "Amend Commit" : "Commit Changes"}
          </DialogTitle>
        </DialogHeader>
        <div className="space-y-4 py-2">
          <CommitDialogStats
            stagedFileCount={stagedFileCount}
            stagedAdditions={stagedAdditions}
            stagedDeletions={stagedDeletions}
          />
          {onAmendChange && (
            <div className="flex items-center space-x-2">
              <Checkbox
                id="amend-checkbox"
                checked={isAmend}
                onCheckedChange={(checked) => {
                  onAmendChange(checked === true);
                  // Pre-fill with last commit message when enabling amend
                  if (checked === true && lastCommitMessage && !commitMessage.trim()) {
                    onCommitMessageChange(lastCommitMessage);
                  }
                }}
              />
              <Label htmlFor="amend-checkbox" className="text-sm cursor-pointer">
                Amend previous commit
              </Label>
            </div>
          )}
          <Textarea
            placeholder={isAmend ? "Enter new commit message..." : "Enter commit message..."}
            value={commitMessage}
            onChange={(e) => onCommitMessageChange(e.target.value)}
            autoFocus
          />
        </div>
        <DialogFooter>
          <DialogClose asChild>
            <Button type="button" variant="outline">
              Cancel
            </Button>
          </DialogClose>
          <Button onClick={onCommit} disabled={!commitMessage.trim() || isLoading}>
            {isLoading ? (
              <>
                <IconLoader2 className="h-4 w-4 animate-spin mr-2" />
                {isAmend ? "Amending..." : "Committing..."}
              </>
            ) : (
              <>
                <IconCheck className="h-4 w-4 mr-2" />
                {isAmend ? "Amend" : "Commit"}
              </>
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

function CommitDialogStats({
  stagedFileCount,
  stagedAdditions,
  stagedDeletions,
}: {
  stagedFileCount: number;
  stagedAdditions: number;
  stagedDeletions: number;
}) {
  return (
    <div className="text-sm text-muted-foreground">
      {stagedFileCount > 0 ? (
        <span>
          <span className="font-medium text-foreground">{stagedFileCount}</span> staged file
          {stagedFileCount !== 1 ? "s" : ""}
          {(stagedAdditions > 0 || stagedDeletions > 0) && (
            <span className="ml-2">
              (<span className="text-green-600">+{stagedAdditions}</span>
              {" / "}
              <span className="text-red-600">-{stagedDeletions}</span>)
            </span>
          )}
        </span>
      ) : (
        <span>No staged files to commit</span>
      )}
    </div>
  );
}

// --- Create PR Dialog ---

type PRDialogProps = {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  prTitle: string;
  onPrTitleChange: (value: string) => void;
  prBody: string;
  onPrBodyChange: (value: string) => void;
  prDraft: boolean;
  onPrDraftChange: (value: boolean) => void;
  onCreatePR: () => void;
  isLoading: boolean;
  displayBranch: string | null;
  baseBranch: string | undefined;
};

export function PRDialog({
  open,
  onOpenChange,
  prTitle,
  onPrTitleChange,
  prBody,
  onPrBodyChange,
  prDraft,
  onPrDraftChange,
  onCreatePR,
  isLoading,
  displayBranch,
  baseBranch,
}: PRDialogProps) {
  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <IconGitPullRequest className="h-5 w-5" />
            Create Pull Request
          </DialogTitle>
        </DialogHeader>
        <div className="space-y-4 py-2">
          {displayBranch && <PRBranchInfo displayBranch={displayBranch} baseBranch={baseBranch} />}
          <div className="space-y-2">
            <Label htmlFor="changes-pr-title" className="text-sm">
              Title
            </Label>
            <input
              id="changes-pr-title"
              type="text"
              placeholder="Pull request title..."
              value={prTitle}
              onChange={(e) => onPrTitleChange(e.target.value)}
              className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm transition-colors placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50"
              autoFocus
            />
          </div>
          <div className="space-y-2">
            <Label htmlFor="changes-pr-body" className="text-sm">
              Description
            </Label>
            <Textarea
              id="changes-pr-body"
              placeholder="Describe your changes..."
              value={prBody}
              onChange={(e) => onPrBodyChange(e.target.value)}
              rows={6}
              className="resize-none max-h-[200px] overflow-y-auto"
            />
          </div>
          <div className="flex items-center space-x-2">
            <Checkbox
              id="changes-pr-draft"
              checked={prDraft}
              onCheckedChange={(checked) => onPrDraftChange(checked === true)}
            />
            <Label htmlFor="changes-pr-draft" className="text-sm cursor-pointer">
              Create as draft
            </Label>
          </div>
        </div>
        <DialogFooter>
          <DialogClose asChild>
            <Button type="button" variant="outline">
              Cancel
            </Button>
          </DialogClose>
          <Button onClick={onCreatePR} disabled={!prTitle.trim() || isLoading}>
            {isLoading ? (
              <>
                <IconLoader2 className="h-4 w-4 animate-spin mr-2" />
                Creating...
              </>
            ) : (
              <>
                <IconGitPullRequest className="h-4 w-4 mr-2" />
                Create PR
              </>
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

function PRBranchInfo({
  displayBranch,
  baseBranch,
}: {
  displayBranch: string;
  baseBranch: string | undefined;
}) {
  return (
    <div className="text-sm text-muted-foreground">
      {baseBranch ? (
        <span>
          Creating PR from <span className="font-medium text-foreground">{displayBranch}</span>{" "}
          &rarr; <span className="font-medium text-foreground">{baseBranch}</span>
        </span>
      ) : (
        <span>
          Creating PR from <span className="font-medium text-foreground">{displayBranch}</span>
        </span>
      )}
    </div>
  );
}

// --- Amend Commit Message Dialog ---

type AmendDialogProps = {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  amendMessage: string;
  onAmendMessageChange: (value: string) => void;
  onAmend: () => void;
  isLoading: boolean;
};

export function AmendDialog({
  open,
  onOpenChange,
  amendMessage,
  onAmendMessageChange,
  onAmend,
  isLoading,
}: AmendDialogProps) {
  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <IconGitCommit className="h-5 w-5" />
            Amend Commit Message
          </DialogTitle>
        </DialogHeader>
        <div className="space-y-4 py-2">
          <p className="text-sm text-muted-foreground">
            Edit the message for the most recent commit.
          </p>
          <Textarea
            placeholder="Enter new commit message..."
            value={amendMessage}
            onChange={(e) => onAmendMessageChange(e.target.value)}
            rows={4}
            className="resize-none"
            autoFocus
          />
        </div>
        <DialogFooter>
          <DialogClose asChild>
            <Button type="button" variant="outline" className="cursor-pointer">
              Cancel
            </Button>
          </DialogClose>
          <Button
            onClick={onAmend}
            disabled={!amendMessage.trim() || isLoading}
            className="cursor-pointer"
          >
            {isLoading ? (
              <>
                <IconLoader2 className="h-4 w-4 animate-spin mr-2" />
                Amending...
              </>
            ) : (
              <>
                <IconCheck className="h-4 w-4 mr-2" />
                Amend
              </>
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

// --- Reset to Commit Dialog ---

type ResetDialogProps = {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  commitSha: string | null;
  onReset: (mode: "soft" | "hard") => void;
  isLoading: boolean;
};

export function ResetDialog({
  open,
  onOpenChange,
  commitSha,
  onReset,
  isLoading,
}: ResetDialogProps) {
  const shortSha = commitSha?.slice(0, 7) ?? "";
  const [mode, setMode] = useState<"soft" | "hard">("soft");
  const [confirmation, setConfirmation] = useState("");

  const isHardResetConfirmed = mode === "hard" && confirmation === shortSha;
  const canReset = !!commitSha && (mode === "soft" || isHardResetConfirmed);

  const handleOpenChange = (newOpen: boolean) => {
    if (!newOpen) {
      // Reset state when closing
      setMode("soft");
      setConfirmation("");
    }
    onOpenChange(newOpen);
  };

  const handleReset = () => {
    if (canReset) {
      onReset(mode);
    }
  };

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogContent className="sm:max-w-[450px]">
        <DialogHeader>
          <DialogTitle>Reset to commit {shortSha}</DialogTitle>
        </DialogHeader>
        <div className="space-y-4 py-2">
          <RadioGroup
            value={mode}
            onValueChange={(v) => setMode(v as "soft" | "hard")}
            className="space-y-3"
          >
            <div className="flex items-start space-x-3">
              <RadioGroupItem value="soft" id="reset-soft" className="mt-1" />
              <div className="flex-1">
                <Label htmlFor="reset-soft" className="font-medium cursor-pointer">
                  Soft Reset
                </Label>
                <p className="text-sm text-muted-foreground">
                  Move HEAD to this commit. Keep all changes staged.
                </p>
              </div>
            </div>
            <div className="flex items-start space-x-3">
              <RadioGroupItem value="hard" id="reset-hard" className="mt-1" />
              <div className="flex-1">
                <Label htmlFor="reset-hard" className="font-medium cursor-pointer text-destructive">
                  Hard Reset
                </Label>
                <p className="text-sm text-muted-foreground">
                  Discard all changes permanently. This cannot be undone.
                </p>
              </div>
            </div>
          </RadioGroup>

          {mode === "hard" && (
            <div className="space-y-2 p-3 border border-destructive/50 rounded-md bg-destructive/5">
              <p className="text-xs text-destructive font-medium">
                Type <code className="bg-muted px-1 rounded">{shortSha}</code> to confirm:
              </p>
              <Input
                value={confirmation}
                onChange={(e) => setConfirmation(e.target.value)}
                placeholder={shortSha}
                className="font-mono h-8 text-sm"
                autoComplete="off"
              />
            </div>
          )}
        </div>
        <DialogFooter>
          <DialogClose asChild>
            <Button type="button" variant="outline" disabled={isLoading}>
              Cancel
            </Button>
          </DialogClose>
          <Button
            onClick={handleReset}
            disabled={!canReset || isLoading}
            variant={mode === "hard" ? "destructive" : "default"}
            className="cursor-pointer"
          >
            {isLoading ? (
              <>
                <IconLoader2 className="h-4 w-4 animate-spin mr-2" />
                Resetting...
              </>
            ) : (
              <>Reset</>
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}