import { Field, ID, InputType, Int } from '@nestjs/graphql';
import {
  IssueLinkType,
  IssuePriority,
  ProjectRole,
  StatusCategory,
} from '@task-stream/api/tracker/domain';
import { Type } from 'class-transformer';
import {
  ArrayMaxSize,
  IsArray,
  IsBoolean,
  IsEnum,
  IsInt,
  IsISO8601,
  IsOptional,
  IsString,
  IsUrl,
  IsUUID,
  Matches,
  Max,
  MaxLength,
  Min,
  MinLength,
  ValidateNested,
} from 'class-validator';

/** Ids of statuses, types and areas (checked against the project's settings). */
const SETTING_ID = /^[A-Za-z][A-Za-z0-9_]{0,29}$/;

@InputType()
export class CreateProjectInput {
  @Field({ description: '2-10 chars, e.g. "TS" → tickets TS-1, TS-2...' })
  @Matches(/^[A-Za-z][A-Za-z0-9]{1,9}$/)
  key!: string;

  @Field() @IsString() @MinLength(1) @MaxLength(120) name!: string;

  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsString()
  @MaxLength(5000)
  description?: string | null;

  @Field({
    nullable: true,
    description: 'Readable by anyone, also without signing in',
  })
  @IsOptional()
  @IsBoolean()
  isPublic?: boolean;
}

@InputType()
export class UpdateProjectInput {
  @Field(() => ID) @IsUUID() projectId!: string;
  @Field({ nullable: true })
  @IsOptional()
  @IsString()
  @MinLength(1)
  @MaxLength(120)
  name?: string;
  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsString()
  @MaxLength(5000)
  description?: string | null;
  @Field({ nullable: true })
  @IsOptional()
  @IsBoolean()
  isPublic?: boolean;
}

@InputType()
export class ProjectMemberInput {
  @Field(() => ID) @IsUUID() projectId!: string;
  @Field(() => ID, { description: 'Pireon user id' })
  @IsString()
  userId!: string;
  @Field(() => ProjectRole, { defaultValue: ProjectRole.MEMBER })
  @IsEnum(ProjectRole)
  role!: ProjectRole;
}

@InputType({ isAbstract: true })
abstract class IssueFieldsInput {
  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsString()
  @MaxLength(50000)
  description?: string | null;

  @Field(() => String, { nullable: true, description: 'An area id' })
  @IsOptional()
  @Matches(SETTING_ID)
  area?: string | null;

  @Field(() => IssuePriority, { nullable: true })
  @IsOptional()
  @IsEnum(IssuePriority)
  priority?: IssuePriority;

  @Field(() => [String], { nullable: true })
  @IsOptional()
  @ArrayMaxSize(20)
  @IsString({ each: true })
  @MaxLength(40, { each: true })
  labels?: string[];

  @Field(() => String, {
    nullable: true,
    description: 'Figma frame for UI changes',
  })
  @IsOptional()
  @IsUrl({ protocols: ['https'] })
  figmaUrl?: string | null;

  @Field(() => Int, { nullable: true })
  @IsOptional()
  @IsInt()
  @Min(0)
  @Max(100)
  storyPoints?: number | null;

  @Field(() => String, { nullable: true }) @IsOptional() @IsISO8601() dueDate?:
    | string
    | null;
}

@InputType()
export class CreateIssueInput extends IssueFieldsInput {
  @Field(() => ID) @IsUUID() projectId!: string;
  @Field({ description: 'A ticket type id' })
  @Matches(SETTING_ID)
  type!: string;
  @Field() @IsString() @MinLength(1) @MaxLength(255) title!: string;
  @Field(() => ID, { nullable: true }) @IsOptional() @IsString() assigneeId?:
    | string
    | null;
  @Field(() => ID, { nullable: true }) @IsOptional() @IsUUID() releaseId?:
    | string
    | null;
}

@InputType()
export class UpdateIssueInput extends IssueFieldsInput {
  @Field(() => ID) @IsUUID() issueId!: string;
  @Field({ nullable: true })
  @IsOptional()
  @Matches(SETTING_ID)
  type?: string;
  @Field({ nullable: true })
  @IsOptional()
  @IsString()
  @MinLength(1)
  @MaxLength(255)
  title?: string;
}

@InputType()
export class ChangeIssueStatusInput {
  @Field(() => ID) @IsUUID() issueId!: string;
  @Field({ description: 'A status id' })
  @Matches(SETTING_ID)
  status!: string;
  @Field(() => String, {
    nullable: true,
    description: 'Required by statuses with requiresReason',
  })
  @IsOptional()
  @IsString()
  @MaxLength(5000)
  reason?: string | null;
}

@InputType()
export class LinkIssuesInput {
  @Field(() => ID) @IsUUID() issueId!: string;
  @Field(() => IssueLinkType) @IsEnum(IssueLinkType) type!: IssueLinkType;
  @Field(() => ID) @IsUUID() targetIssueId!: string;
}

@InputType()
export class IssueFilterInput {
  @Field(() => ID) @IsUUID() projectId!: string;
  @Field(() => [String], { nullable: true })
  @IsOptional()
  @IsString({ each: true })
  statuses?: string[];
  @Field(() => [StatusCategory], { nullable: true })
  @IsOptional()
  @IsEnum(StatusCategory, { each: true })
  categories?: StatusCategory[];
  @Field(() => [String], { nullable: true })
  @IsOptional()
  @IsString({ each: true })
  types?: string[];
  @Field(() => [String], { nullable: true })
  @IsOptional()
  @IsString({ each: true })
  areas?: string[];
  @Field(() => [IssuePriority], { nullable: true })
  @IsOptional()
  @IsEnum(IssuePriority, { each: true })
  priorities?: IssuePriority[];
  @Field(() => ID, { nullable: true })
  @IsOptional()
  @IsString()
  assigneeId?: string;
  @Field({ nullable: true }) @IsOptional() @IsBoolean() unassigned?: boolean;
  @Field(() => ID, { nullable: true })
  @IsOptional()
  @IsUUID()
  releaseId?: string;
  @Field(() => [String], { nullable: true })
  @IsOptional()
  @IsString({ each: true })
  labels?: string[];
  @Field({ nullable: true, description: 'Matches key, title or description' })
  @IsOptional()
  @IsString()
  @MaxLength(200)
  search?: string;
}

@InputType()
export class CreateReleaseInput {
  @Field(() => ID) @IsUUID() projectId!: string;
  @Field({ description: 'e.g. v1.4.0' })
  @IsString()
  @MinLength(1)
  @MaxLength(60)
  name!: string;
  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsString()
  @MaxLength(5000)
  description?: string | null;
  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsISO8601()
  targetDate?: string | null;
}

@InputType()
export class UpdateReleaseInput {
  @Field(() => ID) @IsUUID() releaseId!: string;
  @Field({ nullable: true })
  @IsOptional()
  @IsString()
  @MinLength(1)
  @MaxLength(60)
  name?: string;
  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsString()
  @MaxLength(5000)
  description?: string | null;
  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsISO8601()
  targetDate?: string | null;
}

/* Project settings (owners and admins). Values are archived, never deleted. */

@InputType()
export class WorkflowStatusInput {
  @Field() @Matches(SETTING_ID) id!: string;
  @Field() @IsString() @MinLength(1) @MaxLength(40) name!: string;
  @Field(() => StatusCategory)
  @IsEnum(StatusCategory)
  category!: StatusCategory;
  @Field() @IsString() color!: string;
  @Field({ defaultValue: false }) @IsBoolean() requiresReason!: boolean;
  @Field({ defaultValue: false }) @IsBoolean() archived!: boolean;
}

@InputType()
export class StatusTransitionsInput {
  @Field() @Matches(SETTING_ID) from!: string;
  @Field(() => [String])
  @IsArray()
  @ArrayMaxSize(50)
  @Matches(SETTING_ID, { each: true })
  to!: string[];
}

@InputType()
export class IssueTypeOptionInput {
  @Field() @Matches(SETTING_ID) id!: string;
  @Field() @IsString() @MinLength(1) @MaxLength(40) name!: string;
  @Field() @IsString() icon!: string;
  @Field() @IsString() color!: string;
  @Field({ defaultValue: false }) @IsBoolean() archived!: boolean;
}

@InputType()
export class AreaOptionInput {
  @Field() @Matches(SETTING_ID) id!: string;
  @Field() @IsString() @MinLength(1) @MaxLength(40) name!: string;
  @Field({ defaultValue: false }) @IsBoolean() archived!: boolean;
}

@InputType({
  description:
    'The whole configuration (replaces the previous one). Statuses go in board order.',
})
export class ProjectSettingsInput {
  @Field(() => [WorkflowStatusInput])
  @IsArray()
  @ArrayMaxSize(50)
  @ValidateNested({ each: true })
  @Type(() => WorkflowStatusInput)
  statuses!: WorkflowStatusInput[];

  @Field(() => [StatusTransitionsInput])
  @IsArray()
  @ArrayMaxSize(50)
  @ValidateNested({ each: true })
  @Type(() => StatusTransitionsInput)
  transitions!: StatusTransitionsInput[];

  @Field(() => [IssueTypeOptionInput])
  @IsArray()
  @ArrayMaxSize(50)
  @ValidateNested({ each: true })
  @Type(() => IssueTypeOptionInput)
  issueTypes!: IssueTypeOptionInput[];

  @Field(() => [AreaOptionInput])
  @IsArray()
  @ArrayMaxSize(50)
  @ValidateNested({ each: true })
  @Type(() => AreaOptionInput)
  areas!: AreaOptionInput[];
}