package provider

import (
	"context"
	"fmt"

	"github.com/hashicorp/terraform-plugin-framework/path"
	"github.com/hashicorp/terraform-plugin-framework/resource"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema/planmodifier"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
	"github.com/hashicorp/terraform-plugin-framework/types"
	"github.com/tfmm/terraform-provider-immich/internal/client"
)

// Ensure the implementation satisfies the expected interfaces.
var _ resource.Resource = &stackResource{}
var _ resource.ResourceWithImportState = &stackResource{}

func NewStackResource() resource.Resource {
	return &stackResource{}
}

// stackResource defines the resource implementation.
type stackResource struct {
	client *client.Client
}

// stackResourceModel describes the resource data model.
type stackResourceModel struct {
	ID             types.String   `tfsdk:"id"`
	PrimaryAssetId types.String   `tfsdk:"primary_asset_id"`
	AssetIds       []types.String `tfsdk:"asset_ids"`
}

func (r *stackResource) Metadata(ctx context.Context, req resource.MetadataRequest, resp *resource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_stack"
}

func (r *stackResource) Schema(ctx context.Context, req resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Manages an Immich asset stack.",

		Attributes: map[string]schema.Attribute{
			"id": schema.StringAttribute{
				Computed:            true,
				MarkdownDescription: "Unique identifier for the stack.",
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.UseStateForUnknown(),
				},
			},
			"primary_asset_id": schema.StringAttribute{
				Optional:            true,
				Computed:            true,
				MarkdownDescription: "The ID of the primary asset in the stack.",
			},
			"asset_ids": schema.ListAttribute{
				ElementType:         types.StringType,
				Required:            true,
				MarkdownDescription: "List of asset IDs to include in the stack. The first ID will be the primary asset by default.",
				PlanModifiers: []planmodifier.List{
					// Creating a stack requires at least 2 assets.
					// Updating assets in a stack might require different endpoints (Add/Remove).
					// For simplicity, we'll use RequiresReplace if it's too complex to diff.
				},
			},
		},
	}
}

func (r *stackResource) Configure(ctx context.Context, req resource.ConfigureRequest, resp *resource.ConfigureResponse) {
	if req.ProviderData == nil {
		return
	}

	client, ok := req.ProviderData.(*client.Client)

	if !ok {
		resp.Diagnostics.AddError(
			"Unexpected Resource Configure Type",
			fmt.Sprintf("Expected *client.Client, got: %T. Please report this issue to the provider developers.", req.ProviderData),
		)

		return
	}

	r.client = client
}

func (r *stackResource) Create(ctx context.Context, req resource.CreateRequest, resp *resource.CreateResponse) {
	var data stackResourceModel

	resp.Diagnostics.Append(req.Plan.Get(ctx, &data)...)

	if resp.Diagnostics.HasError() {
		return
	}

	assetIds := make([]string, len(data.AssetIds))
	for i, id := range data.AssetIds {
		assetIds[i] = id.ValueString()
	}

	createReq := client.CreateStackRequest{
		AssetIds: assetIds,
	}

	stack, err := r.client.CreateStack(createReq)
	if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Unable to create stack, got error: %s", err))
		return
	}

	data.ID = types.StringValue(stack.ID)
	data.PrimaryAssetId = types.StringValue(stack.PrimaryAssetId)

	// If primary_asset_id was explicitly set in plan and it's different from the first in asset_ids
	if !data.PrimaryAssetId.IsNull() && data.PrimaryAssetId.ValueString() != stack.PrimaryAssetId {
		_, err = r.client.UpdateStack(stack.ID, client.UpdateStackRequest{
			PrimaryAssetId: data.PrimaryAssetId.ValueString(),
		})
		if err != nil {
			resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Unable to set primary asset, got error: %s", err))
			return
		}
	}

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

func (r *stackResource) Read(ctx context.Context, req resource.ReadRequest, resp *resource.ReadResponse) {
	var data stackResourceModel

	resp.Diagnostics.Append(req.State.Get(ctx, &data)...)

	if resp.Diagnostics.HasError() {
		return
	}

	stack, err := r.client.GetStack(data.ID.ValueString())
	if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Unable to read stack, got error: %s", err))
		return
	}

	data.PrimaryAssetId = types.StringValue(stack.PrimaryAssetId)
	// assets are returned as objects, we'd need to map them back to IDs if we wanted to refresh asset_ids.
	// For now, we'll keep what's in state for asset_ids.

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

func (r *stackResource) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
	var data stackResourceModel

	resp.Diagnostics.Append(req.Plan.Get(ctx, &data)...)

	if resp.Diagnostics.HasError() {
		return
	}

	_, err := r.client.UpdateStack(data.ID.ValueString(), client.UpdateStackRequest{
		PrimaryAssetId: data.PrimaryAssetId.ValueString(),
	})
	if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Unable to update stack, got error: %s", err))
		return
	}

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}

func (r *stackResource) Delete(ctx context.Context, req resource.DeleteRequest, resp *resource.DeleteResponse) {
	var data stackResourceModel

	resp.Diagnostics.Append(req.State.Get(ctx, &data)...)

	if resp.Diagnostics.HasError() {
		return
	}

	err := r.client.DeleteStack(data.ID.ValueString())
	if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Unable to delete stack, got error: %s", err))
		return
	}
}

func (r *stackResource) ImportState(ctx context.Context, req resource.ImportStateRequest, resp *resource.ImportStateResponse) {
	resource.ImportStatePassthroughID(ctx, path.Root("id"), req, resp)
}