"use client";

import { useCallback, useState } from "react";
import {
  IconGitCommit,
  IconGitPullRequest,
  IconCloudDownload,
  IconCloudUpload,
  IconGitCherryPick,
  IconGitMerge,
  IconDots,
  IconCheck,
  IconLoader2,
  IconAlertTriangle,
} from "@tabler/icons-react";
import { Button } from "@kandev/ui/button";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
  DialogClose,
} from "@kandev/ui/dialog";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
  DropdownMenuSeparator,
  DropdownMenuSub,
  DropdownMenuSubTrigger,
  DropdownMenuSubContent,
} from "@kandev/ui/dropdown-menu";
import { Input } from "@kandev/ui/input";
import { Textarea } from "@kandev/ui/textarea";
import { Checkbox } from "@kandev/ui/checkbox";
import { Label } from "@kandev/ui/label";
import { useGitOperations } from "@/hooks/use-git-operations";
import { useSessionGit } from "@/hooks/domains/session/use-session-git";
import type { FileInfo } from "@/lib/state/slices";
import { useToast } from "@/components/toast-provider";
import {
  CommitSummary,
  MobilePRBranchSummary,
  PRSubmitButton,
} from "./session-mobile-top-bar-dialog-parts";

export function computeUncommittedStats(files: Record<string, FileInfo> | undefined) {
  let additions = 0;
  let deletions = 0;
  if (files) {
    for (const file of Object.values(files) as FileInfo[]) {
      additions += file.additions || 0;
      deletions += file.deletions || 0;
    }
  }
  return { additions, deletions, count: files ? Object.keys(files).length : 0 };
}

type GitOperationRunner = () => Promise<{ success: boolean; output: string; error?: string }>;

function useGitToast() {
  const { toast } = useToast();

  return useCallback(
    async (operation: GitOperationRunner, operationName: string) => {
      try {
        const result = await operation();
        if (result.success) {
          toast({
            title: `${operationName} successful`,
            description: result.output.slice(0, 200) || `${operationName} completed successfully`,
            variant: "success",
          });
        } else {
          toast({
            title: `${operationName} failed`,
            description: result.error || "An error occurred",
            variant: "error",
          });
        }
      } catch (error) {
        toast({
          title: `${operationName} failed`,
          description: error instanceof Error ? error.message : "An unexpected error occurred",
          variant: "error",
        });
      }
    },
    [toast],
  );
}

function useCommitDialogForm(
  onOpenChange: (open: boolean) => void,
  onCommit: (message: string, stageAll: boolean) => void,
) {
  const [commitMessage, setCommitMessage] = useState("");
  const [commitBody, setCommitBody] = useState("");
  const [stageAll, setStageAll] = useState(true);

  const handleOpen = (isOpen: boolean) => {
    if (isOpen) {
      setCommitMessage("");
      setCommitBody("");
      setStageAll(true);
    }
    onOpenChange(isOpen);
  };

  const handleCommit = () => {
    const title = commitMessage.trim();
    const body = commitBody.trim();
    const fullMessage = body ? `${title}\n\n${body}` : title;
    onCommit(fullMessage, stageAll);
  };

  return {
    commitMessage,
    setCommitMessage,
    commitBody,
    setCommitBody,
    stageAll,
    setStageAll,
    handleOpen,
    handleCommit,
  };
}

export function CommitDialog({
  open,
  onOpenChange,
  uncommittedCount,
  uncommittedAdditions,
  uncommittedDeletions,
  isGitLoading,
  onCommit,
}: {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  uncommittedCount: number;
  uncommittedAdditions: number;
  uncommittedDeletions: number;
  isGitLoading: boolean;
  onCommit: (message: string, stageAll: boolean) => void;
}) {
  const form = useCommitDialogForm(onOpenChange, onCommit);

  return (
    <Dialog open={open} onOpenChange={form.handleOpen}>
      <DialogContent className="max-w-[90vw] sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <IconGitCommit className="h-5 w-5 text-amber-500" />
            Commit Changes
          </DialogTitle>
        </DialogHeader>
        <div className="space-y-4 py-2">
          <div className="text-sm text-muted-foreground">
            <CommitSummary
              uncommittedCount={uncommittedCount}
              uncommittedAdditions={uncommittedAdditions}
              uncommittedDeletions={uncommittedDeletions}
            />
          </div>
          <Input
            data-testid="commit-title-input"
            placeholder="Enter commit message..."
            value={form.commitMessage}
            onChange={(e) => form.setCommitMessage(e.target.value)}
            autoFocus
          />
          <div className="space-y-2">
            <Label htmlFor="commit-body-mobile" className="text-sm">
              Description
            </Label>
            <Textarea
              id="commit-body-mobile"
              data-testid="commit-body-input"
              placeholder="Add details about this change..."
              value={form.commitBody}
              onChange={(e) => form.setCommitBody(e.target.value)}
              rows={3}
              className="resize-none max-h-[200px] overflow-y-auto"
            />
          </div>
          <div className="flex items-center gap-2">
            <Checkbox
              id="stage-all-mobile"
              checked={form.stageAll}
              onCheckedChange={(checked) => form.setStageAll(checked === true)}
            />
            <Label
              htmlFor="stage-all-mobile"
              className="text-sm text-muted-foreground cursor-pointer"
            >
              Stage all changes before committing
            </Label>
          </div>
        </div>
        <DialogFooter>
          <DialogClose asChild>
            <Button type="button" variant="outline">
              Cancel
            </Button>
          </DialogClose>
          <Button
            className="cursor-pointer"
            onClick={form.handleCommit}
            disabled={!form.commitMessage.trim() || isGitLoading}
          >
            {isGitLoading ? (
              <>
                <IconLoader2 className="h-4 w-4 animate-spin mr-2" />
                Committing...
              </>
            ) : (
              <>
                <IconCheck className="h-4 w-4 mr-2" />
                Commit
              </>
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

export function PRDialog({
  open,
  onOpenChange,
  displayBranch,
  baseBranch,
  isGitLoading,
  taskTitle,
  firstCommitMessage,
  onCreatePR,
}: {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  displayBranch: string | undefined;
  baseBranch: string | undefined;
  isGitLoading: boolean;
  taskTitle: string | undefined;
  firstCommitMessage?: string;
  onCreatePR: (title: string, body: string, draft: boolean) => void;
}) {
  const [prTitle, setPrTitle] = useState("");
  const [prBody, setPrBody] = useState("");
  const [prDraft, setPrDraft] = useState(true);

  const handleOpen = (isOpen: boolean) => {
    if (isOpen) {
      setPrTitle(firstCommitMessage || taskTitle || "");
      setPrBody("");
    }
    onOpenChange(isOpen);
  };

  return (
    <Dialog open={open} onOpenChange={handleOpen}>
      <DialogContent className="max-w-[90vw] sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <IconGitPullRequest className="h-5 w-5 text-cyan-500" />
            Create Pull Request
          </DialogTitle>
        </DialogHeader>
        <div className="space-y-4 py-2">
          <MobilePRBranchSummary displayBranch={displayBranch} baseBranch={baseBranch} />
          <div className="space-y-2">
            <Label htmlFor="pr-title-mobile" className="text-sm">
              Title
            </Label>
            <input
              id="pr-title-mobile"
              type="text"
              placeholder="Pull request title..."
              value={prTitle}
              onChange={(e) => setPrTitle(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"
              autoFocus
            />
          </div>
          <div className="space-y-2">
            <Label htmlFor="pr-body-mobile" className="text-sm">
              Description
            </Label>
            <Textarea
              id="pr-body-mobile"
              placeholder="Describe your changes..."
              value={prBody}
              onChange={(e) => setPrBody(e.target.value)}
              rows={4}
              className="resize-none max-h-[200px] overflow-y-auto"
            />
          </div>
          <div className="flex items-center space-x-2">
            <Checkbox
              id="pr-draft-mobile"
              checked={prDraft}
              onCheckedChange={(checked) => setPrDraft(checked === true)}
            />
            <Label htmlFor="pr-draft-mobile" className="text-sm cursor-pointer">
              Create as draft
            </Label>
          </div>
        </div>
        <DialogFooter>
          <DialogClose asChild>
            <Button type="button" variant="outline">
              Cancel
            </Button>
          </DialogClose>
          <PRSubmitButton
            prTitle={prTitle}
            prBody={prBody}
            prDraft={prDraft}
            isGitLoading={isGitLoading}
            onCreatePR={onCreatePR}
          />
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

export type GitActionsDropdownProps = {
  sessionId: string | null | undefined;
  isGitLoading: boolean;
  uncommittedCount: number;
  baseBranch: string | undefined;
  onCommitClick: () => void;
  onPRClick: () => void;
  onPull: () => void;
  onPush: (force?: boolean) => void;
  onRebase: () => void;
  onMerge: () => void;
};

export function GitActionsDropdown({
  sessionId,
  isGitLoading,
  uncommittedCount,
  baseBranch,
  onCommitClick,
  onPRClick,
  onPull,
  onPush,
  onRebase,
  onMerge,
}: GitActionsDropdownProps) {
  const disabled = isGitLoading || !sessionId;
  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button size="icon-sm" variant="ghost" className="cursor-pointer">
          {isGitLoading ? (
            <IconLoader2 className="h-4 w-4 animate-spin" />
          ) : (
            <IconDots className="h-4 w-4" />
          )}
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end" className="w-56">
        <DropdownMenuItem
          className="cursor-pointer gap-3"
          onClick={onCommitClick}
          disabled={disabled}
        >
          <IconGitCommit className={`h-4 w-4 ${uncommittedCount > 0 ? "text-amber-500" : ""}`} />
          <span className="flex-1">Commit</span>
          {uncommittedCount > 0 && (
            <span className="rounded-full bg-amber-500/20 px-1.5 py-0.5 text-xs font-medium text-amber-600">
              {uncommittedCount}
            </span>
          )}
        </DropdownMenuItem>
        <DropdownMenuItem className="cursor-pointer gap-3" onClick={onPRClick} disabled={disabled}>
          <IconGitPullRequest className="h-4 w-4 text-cyan-500" />
          <span className="flex-1">Create PR</span>
        </DropdownMenuItem>
        <DropdownMenuSeparator />
        <DropdownMenuItem className="cursor-pointer gap-3" onClick={onPull} disabled={disabled}>
          <IconCloudDownload className="h-4 w-4 text-blue-500" />
          <span className="flex-1">Pull</span>
        </DropdownMenuItem>
        <DropdownMenuSub>
          <DropdownMenuSubTrigger className="cursor-pointer gap-3" disabled={disabled}>
            <IconCloudUpload className="h-4 w-4 text-green-500" />
            <span className="flex-1">Push</span>
          </DropdownMenuSubTrigger>
          <DropdownMenuSubContent>
            <DropdownMenuItem
              className="cursor-pointer gap-3"
              onClick={() => onPush(false)}
              disabled={disabled}
            >
              <IconCloudUpload className="h-4 w-4 text-green-500" />
              <span>Push</span>
            </DropdownMenuItem>
            <DropdownMenuItem
              className="cursor-pointer gap-3"
              onClick={() => onPush(true)}
              disabled={disabled}
            >
              <IconAlertTriangle className="h-4 w-4 text-orange-500" />
              <span>Force Push</span>
            </DropdownMenuItem>
          </DropdownMenuSubContent>
        </DropdownMenuSub>
        <DropdownMenuSeparator />
        <DropdownMenuItem className="cursor-pointer gap-3" onClick={onRebase} disabled={disabled}>
          <IconGitCherryPick className="h-4 w-4 text-orange-500" />
          <span className="flex-1">Rebase</span>
          <span className="text-xs text-muted-foreground">onto {baseBranch || "main"}</span>
        </DropdownMenuItem>
        <DropdownMenuItem className="cursor-pointer gap-3" onClick={onMerge} disabled={disabled}>
          <IconGitMerge className="h-4 w-4 text-purple-500" />
          <span className="flex-1">Merge</span>
          <span className="text-xs text-muted-foreground">from {baseBranch || "main"}</span>
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
}

export function useMobileGitActions(
  sessionId: string | null | undefined,
  baseBranch: string | undefined,
  setCommitDialogOpen: (v: boolean) => void,
  setPrDialogOpen: (v: boolean) => void,
) {
  const { toast } = useToast();
  // SessionGit's commit fans out per-repo for multi-repo workspaces; the raw
  // useGitOperations.commit hits the workspace root and fails on multi-repo
  // tasks. Pull from useGitOperations only what SessionGit doesn't override.
  const { pull, push, rebase, merge, createPR, isLoading: isGitLoading } = useGitOperations(
    sessionId ?? null,
  );
  const { commit } = useSessionGit(sessionId ?? null);
  const handleGitOperation = useGitToast();

  const handlePull = useCallback(
    () => handleGitOperation(() => pull(), "Pull"),
    [handleGitOperation, pull],
  );
  const handlePush = useCallback(
    (force = false) => handleGitOperation(() => push({ force }), force ? "Force Push" : "Push"),
    [handleGitOperation, push],
  );
  const handleRebase = useCallback(() => {
    const target = baseBranch?.replace(/^origin\//, "") || "main";
    return handleGitOperation(() => rebase(target), "Rebase");
  }, [handleGitOperation, rebase, baseBranch]);
  const handleMerge = useCallback(() => {
    const target = baseBranch?.replace(/^origin\//, "") || "main";
    return handleGitOperation(() => merge(target), "Merge");
  }, [handleGitOperation, merge, baseBranch]);

  const handleCommit = useCallback(
    async (message: string, stageAll: boolean) => {
      setCommitDialogOpen(false);
      await handleGitOperation(() => commit(message, stageAll), "Commit");
    },
    [handleGitOperation, commit, setCommitDialogOpen],
  );

  const handleCreatePR = useCallback(
    async (title: string, body: string, draft: boolean) => {
      setPrDialogOpen(false);
      try {
        const result = await createPR(title, body, baseBranch, draft);
        if (result.success) {
          toast({
            title: draft ? "Draft Pull Request created" : "Pull Request created",
            description: result.pr_url || "PR created successfully",
            variant: "success",
          });
          if (result.pr_url) window.open(result.pr_url, "_blank");
        } else {
          toast({
            title: "Create PR failed",
            description: result.error || "An error occurred",
            variant: "error",
          });
        }
      } catch (e) {
        toast({
          title: "Create PR failed",
          description: e instanceof Error ? e.message : "An error occurred",
          variant: "error",
        });
      }
    },
    [createPR, baseBranch, toast, setPrDialogOpen],
  );

  return {
    isGitLoading,
    handlePull,
    handlePush,
    handleRebase,
    handleMerge,
    handleCommit,
    handleCreatePR,
  };
}