"use client"

import { useState, useEffect } from "react"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from "@/components/ui/dialog"
import { Loader2, CheckCircle2, Package, FolderKanban, Globe } from "lucide-react"
import { SidebarNavigation } from "@/components/sidebar-navigation"
import { DataTable } from "@/components/data-table"
import {
    fetchProjects,
    fetchAllPackages,
    createPackage,
    type Project,
    type Package as PackageType,
    type PackageCreate
} from "@/lib/api"

export default function CreatePackagePage() {
    const [packages, setPackages] = useState<PackageType[]>([])
    const [projects, setProjects] = useState<Project[]>([])
    const [isLoading, setIsLoading] = useState(true)
    const [isModalOpen, setIsModalOpen] = useState(false)
    const [isSubmitting, setIsSubmitting] = useState(false)
    const [success, setSuccess] = useState(false)
    const [error, setError] = useState<string | null>(null)
    const [loadingProjects, setLoadingProjects] = useState(false)

    // Form fields
    const [selectedProjectId, setSelectedProjectId] = useState("")
    const [name, setName] = useState("")
    const [region, setRegion] = useState("")

    // Load packages and projects
    const loadPackages = async () => {
        try {
            setIsLoading(true)
            setError(null)
            const data = await fetchAllPackages()
            setPackages(data)
        } catch (err) {
            setError("Failed to load packages. Please check if the backend is running.")
        } finally {
            setIsLoading(false)
        }
    }

    const loadProjects = async () => {
        try {
            setLoadingProjects(true)
            const data = await fetchProjects()
            setProjects(data)
        } catch (err) {
            setError("Failed to load projects.")
        } finally {
            setLoadingProjects(false)
        }
    }

    useEffect(() => {
        loadPackages()
        loadProjects()
    }, [])

    const resetForm = () => {
        setSelectedProjectId("")
        setName("")
        setRegion("")
        setError(null)
    }

    const handleSubmit = async (e: React.FormEvent) => {
        e.preventDefault()
        if (!selectedProjectId) {
            setError("Please select a project first")
            return
        }
        if (!name.trim()) {
            setError("Package name is required")
            return
        }

        setIsSubmitting(true)
        setError(null)

        try {
            const data: PackageCreate = {
                project_id: selectedProjectId,
                name: name.trim(),
                region: region.trim() || null,
            }

            await createPackage(data)
            setSuccess(true)

            // Refresh packages list
            await loadPackages()

            setTimeout(() => {
                resetForm()
                setSuccess(false)
                setIsModalOpen(false)
            }, 2000)
        } catch (err) {
            setError(err instanceof Error ? err.message : "Failed to create package")
        } finally {
            setIsSubmitting(false)
        }
    }

    const getProjectName = (projectId: string) => {
        return projects.find(p => p.id === projectId)?.name || projectId
    }

    const selectedProject = projects.find(p => p.id === selectedProjectId)

    const columns = [
        {
            key: "name",
            header: "Package Name",
            render: (pkg: PackageType) => (
                <div className="font-semibold text-gray-900 dark:text-gray-100">{pkg.name}</div>
            )
        },
        {
            key: "project_id",
            header: "Project",
            render: (pkg: PackageType) => getProjectName(pkg.project_id)
        },
        {
            key: "region",
            header: "Region",
        },
        {
            key: "created_at",
            header: "Created",
            render: (pkg: PackageType) => new Date(pkg.created_at).toLocaleDateString()
        },
    ]

    return (
        <div className="min-h-screen bg-mesh-gradient text-gray-900 dark:text-gray-100">
            <SidebarNavigation />
            <main className="ml-16 min-h-screen relative overflow-hidden">
                <div className="mx-auto px-4 py-8 max-w-6xl relative z-10">
                    {/* Header */}
                    <div className="mb-8 animate-in fade-in slide-in-from-left duration-700">
                        <div className="flex items-center gap-6">
                            <div className="flex-shrink-0 w-16 h-16 rounded-2xl bg-white shadow-xl border-2 border-[#1e40af] transition-transform duration-300 hover:scale-110 flex items-center justify-center">
                                <Package className="h-8 w-8 text-[#2563eb]" />
                            </div>
                            <div className="flex flex-col">
                                <h1 className="text-3xl md:text-4xl font-extrabold text-[#2563eb] tracking-tight">
                                    Packages
                                </h1>
                                <p className="text-gray-500 dark:text-gray-400 mt-1 text-sm font-medium italic">
                                    Manage project packages
                                </p>
                            </div>
                        </div>
                    </div>

                    {/* Error Message */}
                    {error && !isModalOpen && (
                        <div className="mb-6 flex items-center gap-3 p-4 rounded-xl bg-red-50 dark:bg-red-950/30 border border-red-200 dark:border-red-800 animate-in fade-in slide-in-from-top duration-300">
                            <div className="w-5 h-5 rounded-full bg-red-100 dark:bg-red-900 flex items-center justify-center flex-shrink-0">
                                <span className="text-xs font-bold text-red-500">!</span>
                            </div>
                            <p className="text-sm text-red-600 dark:text-red-400">{error}</p>
                        </div>
                    )}

                    {/* Data Table */}
                    <div className="animate-in fade-in slide-in-from-bottom duration-700 delay-150">
                        <DataTable
                            title="All Packages"
                            data={packages}
                            columns={columns}
                            onAddNew={() => setIsModalOpen(true)}
                            addButtonText="Add New Package"
                            isLoading={isLoading}
                        />
                    </div>

                    {/* Footer */}
                    <div className="mt-8 text-center animate-in fade-in duration-700 delay-300">
                        <p className="text-xs text-gray-400 dark:text-gray-500">
                            Sentient Geeks Pvt. Ltd.
                        </p>
                    </div>
                </div>
            </main>

            {/* Modal Dialog */}
            <Dialog open={isModalOpen} onOpenChange={setIsModalOpen}>
                <DialogContent className="max-w-2xl">
                    <DialogHeader>
                        <DialogTitle className="flex items-center gap-2">
                            <Package className="h-5 w-5 text-violet-500" />
                            Create New Package
                        </DialogTitle>
                        <DialogDescription>
                            Select a project and fill in the package details
                        </DialogDescription>
                    </DialogHeader>

                    {/* Success Message in Modal */}
                    {success && (
                        <div className="flex items-center gap-3 p-4 rounded-xl bg-gradient-to-r from-violet-50 to-purple-50 dark:from-violet-950/30 dark:to-purple-950/30 border border-violet-200 dark:border-violet-800 animate-in fade-in slide-in-from-top duration-300">
                            <CheckCircle2 className="h-5 w-5 text-violet-500 flex-shrink-0" />
                            <p className="text-sm font-medium text-violet-700 dark:text-violet-400">Package created successfully!</p>
                        </div>
                    )}

                    {/* Error Message in Modal */}
                    {error && (
                        <div className="flex items-center gap-3 p-4 rounded-xl bg-red-50 dark:bg-red-950/30 border border-red-200 dark:border-red-800 animate-in fade-in slide-in-from-top duration-300">
                            <div className="w-5 h-5 rounded-full bg-red-100 dark:bg-red-900 flex items-center justify-center flex-shrink-0">
                                <span className="text-xs font-bold text-red-500">!</span>
                            </div>
                            <p className="text-sm text-red-600 dark:text-red-400">{error}</p>
                        </div>
                    )}

                    <form onSubmit={handleSubmit} className="space-y-6">
                        {/* Step 1: Select Project */}
                        <div className="p-4 rounded-xl bg-gradient-to-r from-violet-50/50 to-purple-50/50 dark:from-violet-950/20 dark:to-purple-950/20 border border-violet-100 dark:border-violet-900/50">
                            <div className="flex items-center gap-2 mb-3">
                                <div className="w-6 h-6 rounded-full bg-gradient-to-br from-violet-500 to-purple-600 flex items-center justify-center">
                                    <span className="text-white text-xs font-bold">1</span>
                                </div>
                                <p className="text-sm font-bold text-violet-700 dark:text-violet-400">Select Project</p>
                            </div>
                            <Select value={selectedProjectId} onValueChange={setSelectedProjectId}>
                                <SelectTrigger className="h-11 bg-white dark:bg-gray-800 border-violet-200 dark:border-violet-800 focus:border-violet-400">
                                    {loadingProjects ? (
                                        <div className="flex items-center gap-2">
                                            <Loader2 className="h-4 w-4 animate-spin text-violet-500" />
                                            <span className="text-gray-400">Loading projects...</span>
                                        </div>
                                    ) : (
                                        <SelectValue placeholder="Choose a project" />
                                    )}
                                </SelectTrigger>
                                <SelectContent>
                                    {projects.map(project => (
                                        <SelectItem key={project.id} value={project.id}>
                                            <span className="font-medium">{project.name}</span>
                                            {project.state && <span className="text-gray-400 ml-2">({project.state})</span>}
                                        </SelectItem>
                                    ))}
                                </SelectContent>
                            </Select>
                            {selectedProject && (
                                <div className="mt-2 px-3 py-1.5 rounded-lg bg-violet-100/50 dark:bg-violet-900/20 text-xs text-violet-600 dark:text-violet-400">
                                    Selected: <span className="font-semibold">{selectedProject.name}</span>
                                    {selectedProject.corridor_name && ` • ${selectedProject.corridor_name}`}
                                </div>
                            )}
                        </div>

                        {/* Step 2: Package Info */}
                        <div className={`space-y-4 transition-opacity duration-300 ${selectedProjectId ? 'opacity-100' : 'opacity-40 pointer-events-none'}`}>
                            <div className="flex items-center gap-2">
                                <div className={`w-6 h-6 rounded-full flex items-center justify-center ${selectedProjectId ? 'bg-gradient-to-br from-violet-500 to-purple-600' : 'bg-gray-300 dark:bg-gray-600'}`}>
                                    <span className="text-white text-xs font-bold">2</span>
                                </div>
                                <p className="text-sm font-bold text-gray-700 dark:text-gray-300">Package Information</p>
                            </div>

                            <div className="space-y-2">
                                <Label htmlFor="pkg-name" className="text-sm font-semibold flex items-center gap-1">
                                    Package Name <span className="text-red-500">*</span>
                                </Label>
                                <Input
                                    id="pkg-name"
                                    value={name}
                                    onChange={(e) => setName(e.target.value)}
                                    placeholder="e.g., Package A - Section 1"
                                    className="h-11"
                                    required
                                />
                            </div>

                            <div className="space-y-2">
                                <Label htmlFor="region" className="text-sm font-semibold flex items-center gap-1">
                                    <Globe className="h-3.5 w-3.5 text-gray-400" />
                                    Region <span className="text-gray-400 font-normal text-xs">(Optional)</span>
                                </Label>
                                <Input
                                    id="region"
                                    value={region}
                                    onChange={(e) => setRegion(e.target.value)}
                                    placeholder="e.g., Delhi, Haryana, Punjab"
                                    className="h-11"
                                />
                            </div>
                        </div>

                        {/* Submit Button */}
                        <div className="flex gap-3">
                            <Button
                                type="button"
                                variant="outline"
                                onClick={() => {
                                    setIsModalOpen(false)
                                    resetForm()
                                }}
                                disabled={isSubmitting}
                                className="flex-1"
                            >
                                Cancel
                            </Button>
                            <Button
                                type="submit"
                                disabled={isSubmitting || !name.trim() || !selectedProjectId}
                                className="flex-1 bg-gradient-to-r from-violet-500 via-purple-500 to-fuchsia-600 hover:from-violet-600 hover:via-purple-600 hover:to-fuchsia-700 text-white"
                            >
                                {isSubmitting ? (
                                    <span className="flex items-center gap-2">
                                        <Loader2 className="h-4 w-4 animate-spin" />
                                        Creating...
                                    </span>
                                ) : (
                                    <span className="flex items-center gap-2">
                                        <Package className="h-4 w-4" />
                                        Create Package
                                    </span>
                                )}
                            </Button>
                        </div>
                    </form>
                </DialogContent>
            </Dialog>
        </div>
    )
}